diff options
| author | r.kuznetsov <r.kuznetsov@corp.mail.ru> | 2017-02-17 18:25:08 +0300 |
|---|---|---|
| committer | Sergey Yershov <syershov@maps.me> | 2017-02-17 18:33:50 +0300 |
| commit | 325d595022107c965fffa8276276d062a48ea0a2 (patch) | |
| tree | 80226c5b2c2e528e24e52d25b07e62634dd2b6c7 | |
| parent | 009388f72e98d9eee5a3a2d44e734fcec2f68a7d (diff) | |
Upgraded stb lib, removed lodepngbeta-638
48 files changed, 8103 insertions, 10714 deletions
diff --git a/3party/3party.pro b/3party/3party.pro index 66572ae830..182eae7aea 100644 --- a/3party/3party.pro +++ b/3party/3party.pro @@ -7,7 +7,7 @@ TEMPLATE = subdirs CONFIG *= desktop } -SUBDIRS = freetype fribidi minizip jansson protobuf osrm expat succinct pugixml liboauthcpp +SUBDIRS = freetype fribidi minizip jansson protobuf osrm expat succinct pugixml liboauthcpp stb_image sdf_image # TODO(mgsrergio): Move opening hours out of 3party to the main project tree. # See https://trello.com/c/tWYSnXSS/22-opening-hours-3party-boost-test-framework. diff --git a/3party/lodepng/lodepng.cpp b/3party/lodepng/lodepng.cpp deleted file mode 100644 index 2fbeab6246..0000000000 --- a/3party/lodepng/lodepng.cpp +++ /dev/null @@ -1,4340 +0,0 @@ -/* -LodePNG version 20100314 - -Copyright (c) 2005-2010 Lode Vandevenne - -This software is provided 'as-is', without any express or implied -warranty. In no event will the authors be held liable for any damages -arising from the use of this software. - -Permission is granted to anyone to use this software for any purpose, -including commercial applications, and to alter it and redistribute it -freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - - 3. This notice may not be removed or altered from any source - distribution. -*/ - -/* -The manual and changelog can be found in the header file "lodepng.h" -You are free to name this file lodepng.cpp or lodepng.c depending on your usage. -*/ - -#include "lodepng.hpp" - -#define VERSION_STRING "20100314" - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Tools For C / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/* -About these tools (vector, uivector, ucvector and string): --LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version. --The string tools are made to avoid problems with compilers that declare things like strncat as deprecated. --They're not used in the interface, only internally in this file, so all their functions are made static. -*/ - -#ifdef LODEPNG_COMPILE_ZLIB -#ifdef LODEPNG_COMPILE_ENCODER - -typedef struct png_vector /*this one is used only by the deflate compressor*/ -{ - void* data; - size_t size; /*in groups of bytes depending on type*/ - size_t allocsize; /*in bytes*/ - unsigned typesize; /*sizeof the type you store in data*/ -} png_vector; - -static unsigned vector_resize(png_vector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - if(size * p->typesize > p->allocsize) - { - size_t newsize = size * p->typesize * 2; - void* data = realloc(p->data, newsize); - if(data) - { - p->allocsize = newsize; - p->data = data; - p->size = size; - } - else return 0; - } - else p->size = size; - return 1; -} - -static unsigned vector_resized(png_vector* p, size_t size, void dtor(void*)) /*resize and use destructor on elements if it gets smaller*/ -{ - size_t i; - if(size < p->size) for(i = size; i < p->size; i++) dtor(&((char*)(p->data))[i * p->typesize]); - return vector_resize(p, size); -} - -static void vector_cleanup(void* p) -{ - ((png_vector*)p)->size = ((png_vector*)p)->allocsize = 0; - free(((png_vector*)p)->data); - ((png_vector*)p)->data = NULL; -} - -static void vector_cleanupd(png_vector* p, void dtor(void*)) /*clear and use destructor on elements*/ -{ - vector_resized(p, 0, dtor); - vector_cleanup(p); -} - -static void vector_init(png_vector* p, unsigned typesize) -{ - p->data = NULL; - p->size = p->allocsize = 0; - p->typesize = typesize; -} - -static void vector_swap(png_vector* p, png_vector* q) /*they're supposed to have the same typesize*/ -{ - size_t tmp; - void* tmpp; - tmp = p->size; p->size = q->size; q->size = tmp; - tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp; - tmpp = p->data; p->data = q->data; q->data = tmpp; -} - -static void* vector_get(png_vector* p, size_t index) -{ - return &((char*)p->data)[index * p->typesize]; -} - -#endif /*LODEPNG_COMPILE_ENCODER*/ -#endif /*LODEPNG_COMPILE_ZLIB*/ - -/* /////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ZLIB -typedef struct uivector -{ - unsigned* data; - size_t size; /*size in number of unsigned longs*/ - size_t allocsize; /*allocated size in bytes*/ -} uivector; - -static void uivector_cleanup(void* p) -{ - ((uivector*)p)->size = ((uivector*)p)->allocsize = 0; - free(((uivector*)p)->data); - ((uivector*)p)->data = NULL; -} - -static unsigned uivector_resize(uivector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - if(size * sizeof(unsigned) > p->allocsize) - { - size_t newsize = size * sizeof(unsigned) * 2; - void* data = realloc(p->data, newsize); - if(data) - { - p->allocsize = newsize; - p->data = (unsigned*)data; - p->size = size; - } - else return 0; - } - else p->size = size; - return 1; -} - -static unsigned uivector_resizev(uivector* p, size_t size, unsigned value) /*resize and give all new elements the value*/ -{ - size_t oldsize = p->size, i; - if(!uivector_resize(p, size)) return 0; - for(i = oldsize; i < size; i++) p->data[i] = value; - return 1; -} - -static void uivector_init(uivector* p) -{ - p->data = NULL; - p->size = p->allocsize = 0; -} - -#ifdef LODEPNG_COMPILE_ENCODER -static unsigned uivector_push_back(uivector* p, unsigned c) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - if(!uivector_resize(p, p->size + 1)) return 0; - p->data[p->size - 1] = c; - return 1; -} - -static unsigned uivector_copy(uivector* p, const uivector* q) /*copy q to p, returns 1 if success, 0 if failure ==> nothing done*/ -{ - size_t i; - if(!uivector_resize(p, q->size)) return 0; - for(i = 0; i < q->size; i++) p->data[i] = q->data[i]; - return 1; -} - -static void uivector_swap(uivector* p, uivector* q) -{ - size_t tmp; - unsigned* tmpp; - tmp = p->size; p->size = q->size; q->size = tmp; - tmp = p->allocsize; p->allocsize = q->allocsize; q->allocsize = tmp; - tmpp = p->data; p->data = q->data; q->data = tmpp; -} -#endif /*LODEPNG_COMPILE_ENCODER*/ -#endif /*LODEPNG_COMPILE_ZLIB*/ - -/* /////////////////////////////////////////////////////////////////////////// */ - -typedef struct ucvector -{ - unsigned char* data; - size_t size; /*used size*/ - size_t allocsize; /*allocated size*/ -} ucvector; - -static void ucvector_cleanup(void* p) -{ - ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0; - free(((ucvector*)p)->data); - ((ucvector*)p)->data = NULL; -} - -static unsigned ucvector_resize(ucvector* p, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - if(size * sizeof(unsigned char) > p->allocsize) - { - size_t newsize = size * sizeof(unsigned char) * 2; - void* data = realloc(p->data, newsize); - if(data) - { - p->allocsize = newsize; - p->data = (unsigned char*)data; - p->size = size; - } - else return 0; /*error: not enough memory*/ - } - else p->size = size; - return 1; -} - -#ifdef LODEPNG_COMPILE_DECODER -#ifdef LODEPNG_COMPILE_PNG -static unsigned ucvector_resizev(ucvector* p, size_t size, unsigned char value) /*resize and give all new elements the value*/ -{ - size_t oldsize = p->size, i; - if(!ucvector_resize(p, size)) return 0; - for(i = oldsize; i < size; i++) p->data[i] = value; - return 1; -} -#endif /*LODEPNG_COMPILE_PNG*/ -#endif /*LODEPNG_COMPILE_DECODER*/ - -static void ucvector_init(ucvector* p) -{ - p->data = NULL; - p->size = p->allocsize = 0; -} - -#ifdef LODEPNG_COMPILE_ZLIB -/*you can both convert from png_vector to buffer&size and vica versa*/ -static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size) -{ - p->data = buffer; - p->allocsize = p->size = size; -} -#endif /*LODEPNG_COMPILE_ZLIB*/ - -static unsigned ucvector_push_back(ucvector* p, unsigned char c) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - if(!ucvector_resize(p, p->size + 1)) return 0; - p->data[p->size - 1] = c; - return 1; -} - -/* /////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_PNG -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -static unsigned string_resize(char** out, size_t size) /*returns 1 if success, 0 if failure ==> nothing done*/ -{ - char* data = (char*)realloc(*out, size + 1); - if(data) - { - data[size] = 0; /*null termination char*/ - *out = data; - } - return data != 0; -} - -static void string_init(char** out) /*init a {char*, size_t} pair for use as string*/ -{ - *out = NULL; - string_resize(out, 0); -} - -static void string_cleanup(char** out) /*free the above pair again*/ -{ - free(*out); - *out = NULL; -} - -static void string_set(char** out, const char* in) -{ - size_t insize = strlen(in), i = 0; - if(string_resize(out, insize)) for(i = 0; i < insize; i++) (*out)[i] = in[i]; -} -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -#endif /*LODEPNG_COMPILE_PNG*/ - -#ifdef LODEPNG_COMPILE_ZLIB - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Reading and writing single bits and bytes from/to stream for Deflate / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ENCODER -static void addBitToStream(size_t* bitpointer, ucvector* bitstream, unsigned char bit) -{ - if((*bitpointer) % 8 == 0) ucvector_push_back(bitstream, 0); /*add a new byte at the end*/ - (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7)); /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ - (*bitpointer)++; -} - -static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) -{ - size_t i; - for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1)); -} - -static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) -{ - size_t i; - for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1)); -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#ifdef LODEPNG_COMPILE_DECODER -static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream) -{ - unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> ((*bitpointer) & 0x7)) & 1); - (*bitpointer)++; - return result; -} - -static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) -{ - unsigned result = 0, i; - for(i = 0; i < nbits; i++) result += ((unsigned)readBitFromStream(bitpointer, bitstream)) << i; - return result; -} -#endif /*LODEPNG_COMPILE_DECODER*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Deflate - Huffman / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#define FIRST_LENGTH_CODE_INDEX 257 -#define LAST_LENGTH_CODE_INDEX 285 -#define NUM_DEFLATE_CODE_SYMBOLS 288 /*256 literals, the end code, some length codes, and 2 unused codes*/ -#define NUM_DISTANCE_SYMBOLS 32 /*the distance codes have their own symbols, 30 used, 2 unused*/ -#define NUM_CODE_LENGTH_CODES 19 /*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/ - -static const unsigned LENGTHBASE[29] /*the base lengths represented by codes 257-285*/ - = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258}; -static const unsigned LENGTHEXTRA[29] /*the extra bits used by codes 257-285 (added to base length)*/ - = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; -static const unsigned DISTANCEBASE[30] /*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/ - = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; -static const unsigned DISTANCEEXTRA[30] /*the extra bits of backwards distances (added to base)*/ - = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; -static const unsigned CLCL[NUM_CODE_LENGTH_CODES] /*the order in which "code length alphabet code lengths" are stored, out of this the huffman tree of the dynamic huffman tree lengths is generated*/ - = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; - -/* /////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ENCODER -/*terminology used for the package-merge algorithm and the coin collector's problem*/ -typedef struct Coin /*a coin can be multiple coins (when they're merged)*/ -{ - uivector symbols; - float weight; /*the sum of all weights in this coin*/ -} Coin; - -static void Coin_init(Coin* c) -{ - uivector_init(&c->symbols); -} - -static void Coin_cleanup(void* c) /*void* so that this dtor can be given as function pointer to the vector resize function*/ -{ - uivector_cleanup(&((Coin*)c)->symbols); -} - -static void Coin_copy(Coin* c1, const Coin* c2) -{ - c1->weight = c2->weight; - uivector_copy(&c1->symbols, &c2->symbols); -} - -static void addCoins(Coin* c1, const Coin* c2) -{ - unsigned i; - for(i = 0; i < c2->symbols.size; i++) uivector_push_back(&c1->symbols, c2->symbols.data[i]); - c1->weight += c2->weight; -} - -static void Coin_sort(Coin* data, size_t amount) /*combsort*/ -{ - size_t gap = amount; - unsigned char swapped = 0; - while(gap > 1 || swapped) - { - size_t i; - gap = (gap * 10) / 13; /*shrink factor 1.3*/ - if(gap == 9 || gap == 10) gap = 11; /*combsort11*/ - if(gap < 1) gap = 1; - swapped = 0; - for(i = 0; i < amount - gap; i++) - { - size_t j = i + gap; - if(data[j].weight < data[i].weight) - { - float temp = data[j].weight; data[j].weight = data[i].weight; data[i].weight = temp; - uivector_swap(&data[i].symbols, &data[j].symbols); - swapped = 1; - } - } - } -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - -typedef struct HuffmanTree -{ - uivector tree2d; - uivector tree1d; - uivector lengths; /*the lengths of the codes of the 1d-tree*/ - unsigned maxbitlen; /*maximum number of bits a single code can get*/ - unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ -} HuffmanTree; - -/*function used for debug purposes*/ -/*#include <iostream> -static void HuffmanTree_draw(HuffmanTree* tree) -{ - std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl; - for(size_t i = 0; i < tree->tree1d.size; i++) - { - if(tree->lengths.data[i]) - std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl; - } - std::cout << std::endl; -}*/ - -static void HuffmanTree_init(HuffmanTree* tree) -{ - uivector_init(&tree->tree2d); - uivector_init(&tree->tree1d); - uivector_init(&tree->lengths); -} - -static void HuffmanTree_cleanup(HuffmanTree* tree) -{ - uivector_cleanup(&tree->tree2d); - uivector_cleanup(&tree->tree1d); - uivector_cleanup(&tree->lengths); -} - -/*the tree representation used by the decoder. return value is error*/ -static unsigned HuffmanTree_make2DTree(HuffmanTree* tree) -{ - unsigned nodefilled = 0; /*up to which node it is filled*/ - unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/ - unsigned n, i; - - if(!uivector_resize(&tree->tree2d, tree->numcodes * 2)) return 9901; /*if failed return not enough memory error*/ - /*convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means uninited, a value >= numcodes is an address to another bit, a value < numcodes is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as many columns as codes - 1 - a good huffmann tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. Here, the internal nodes are stored (what their 0 and 1 option point to). There is only memory for such good tree currently, if there are more nodes (due to too long length codes), error 55 will happen*/ - for(n = 0; n < tree->numcodes * 2; n++) tree->tree2d.data[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/ - - for(n = 0; n < tree->numcodes; n++) /*the codes*/ - for(i = 0; i < tree->lengths.data[n]; i++) /*the bits for this code*/ - { - unsigned char bit = (unsigned char)((tree->tree1d.data[n] >> (tree->lengths.data[n] - i - 1)) & 1); - if(treepos > tree->numcodes - 2) return 55; /*error 55: oversubscribed; see description in header*/ - if(tree->tree2d.data[2 * treepos + bit] == 32767) /*not yet filled in*/ - { - if(i + 1 == tree->lengths.data[n]) /*last bit*/ - { - tree->tree2d.data[2 * treepos + bit] = n; /*put the current code in it*/ - treepos = 0; - } - else /*put address of the next step in here, first that address has to be found of course (it's just nodefilled + 1)...*/ - { - nodefilled++; - tree->tree2d.data[2 * treepos + bit] = nodefilled + tree->numcodes; /*addresses encoded with numcodes added to it*/ - treepos = nodefilled; - } - } - else treepos = tree->tree2d.data[2 * treepos + bit] - tree->numcodes; - } - for(n = 0; n < tree->numcodes * 2; n++) if(tree->tree2d.data[n] == 32767) tree->tree2d.data[n] = 0; /*remove possible remaining 32767's*/ - - return 0; -} - -static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) /*given that numcodes, lengths and maxbitlen are already filled in correctly. return value is error.*/ -{ - uivector blcount; - uivector nextcode; - unsigned bits, n, error = 0; - - uivector_init(&blcount); - uivector_init(&nextcode); - if(!uivector_resize(&tree->tree1d, tree->numcodes) - || !uivector_resizev(&blcount, tree->maxbitlen + 1, 0) - || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0)) - error = 9902; - - if(!error) - { - /*step 1: count number of instances of each code length*/ - for(bits = 0; bits < tree->numcodes; bits++) blcount.data[tree->lengths.data[bits]]++; - /*step 2: generate the nextcode values*/ - for(bits = 1; bits <= tree->maxbitlen; bits++) nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1; - /*step 3: generate all the codes*/ - for(n = 0; n < tree->numcodes; n++) if(tree->lengths.data[n] != 0) tree->tree1d.data[n] = nextcode.data[tree->lengths.data[n]]++; - } - - uivector_cleanup(&blcount); - uivector_cleanup(&nextcode); - - if(!error) return HuffmanTree_make2DTree(tree); - else return error; -} - -/*given the code lengths (as stored in the PNG file), generate the tree as defined by Deflate. maxbitlen is the maximum bits that a code in the tree can have. return value is error.*/ -static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, size_t numcodes, unsigned maxbitlen) -{ - unsigned i; - if(!uivector_resize(&tree->lengths, numcodes)) return 9903; - for(i = 0; i < numcodes; i++) tree->lengths.data[i] = bitlen[i]; - tree->numcodes = (unsigned)numcodes; /*number of symbols*/ - tree->maxbitlen = maxbitlen; - return HuffmanTree_makeFromLengths2(tree); -} - -#ifdef LODEPNG_COMPILE_ENCODER -static unsigned HuffmanTree_fillInCoins(png_vector* coins, const unsigned* frequencies, unsigned numcodes, size_t sum) -{ - unsigned i; - for(i = 0; i < numcodes; i++) - { - Coin* coin; - if(frequencies[i] == 0) continue; /*it's important to exclude symbols that aren't present*/ - if(!vector_resize(coins, coins->size + 1)) { vector_cleanup(coins); return 9904; } - coin = (Coin*)(vector_get(coins, coins->size - 1)); - Coin_init(coin); - coin->weight = frequencies[i] / (float)sum; - uivector_push_back(&coin->symbols, i); - } - if(coins->size) Coin_sort((Coin*)coins->data, coins->size); - return 0; -} - -static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies, size_t numcodes, unsigned maxbitlen) -{ - unsigned i, j; - size_t sum = 0, numpresent = 0; - unsigned error = 0; - - png_vector prev_row; /*type Coin, the previous row of coins*/ - png_vector coins; /*type Coin, the coins of the currently calculated row*/ - - tree->maxbitlen = maxbitlen; - - for(i = 0; i < numcodes; i++) - { - if(frequencies[i] > 0) - { - numpresent++; - sum += frequencies[i]; - } - } - - if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/ - tree->numcodes = (unsigned)numcodes; /*number of symbols*/ - uivector_resize(&tree->lengths, 0); - if(!uivector_resizev(&tree->lengths, tree->numcodes, 0)) return 9905; - - if(numpresent == 0) /*there are no symbols at all, in that case add one symbol of value 0 to the tree (see RFC 1951 section 3.2.7) */ - { - tree->lengths.data[0] = 1; - return HuffmanTree_makeFromLengths2(tree); - } - else if(numpresent == 1) /*the package merge algorithm gives wrong results if there's only one symbol (theoretically 0 bits would then suffice, but we need a proper symbol for zlib)*/ - { - for(i = 0; i < numcodes; i++) if(frequencies[i]) tree->lengths.data[i] = 1; - return HuffmanTree_makeFromLengths2(tree); - } - - vector_init(&coins, sizeof(Coin)); - vector_init(&prev_row, sizeof(Coin)); - - /*Package-Merge algorithm represented by coin collector's problem - For every symbol, maxbitlen coins will be created*/ - - /*first row, lowest denominator*/ - error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum); - if(!error) - { - for(j = 1; j <= maxbitlen && !error; j++) /*each of the remaining rows*/ - { - vector_swap(&coins, &prev_row); /*swap instead of copying*/ - if(!vector_resized(&coins, 0, Coin_cleanup)) { error = 9906; break; } - - for(i = 0; i + 1 < prev_row.size; i += 2) - { - if(!vector_resize(&coins, coins.size + 1)) { error = 9907; break; } - Coin_init((Coin*)vector_get(&coins, coins.size - 1)); - Coin_copy((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i)); - addCoins((Coin*)vector_get(&coins, coins.size - 1), (Coin*)vector_get(&prev_row, i + 1)); /*merge the coins into packages*/ - } - if(j < maxbitlen) - { - error = HuffmanTree_fillInCoins(&coins, frequencies, tree->numcodes, sum); - } - } - } - - if(!error) - { - /*keep the coins with lowest weight, so that they add up to the amount of symbols - 1*/ - vector_resized(&coins, numpresent - 1, Coin_cleanup); - - /*calculate the lenghts of each symbol, as the amount of times a coin of each symbol is used*/ - for(i = 0; i < coins.size; i++) - { - Coin* coin = (Coin*)vector_get(&coins, i); - for(j = 0; j < coin->symbols.size; j++) tree->lengths.data[coin->symbols.data[j]]++; - } - - error = HuffmanTree_makeFromLengths2(tree); - } - - vector_cleanupd(&coins, Coin_cleanup); - vector_cleanupd(&prev_row, Coin_cleanup); - - return error; -} - -static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index) { return tree->tree1d.data[index]; } -static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index) { return tree->lengths.data[index]; } -#endif /*LODEPNG_COMPILE_ENCODER*/ - -/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ -static unsigned generateFixedTree(HuffmanTree* tree) -{ - unsigned i, error = 0; - uivector bitlen; - uivector_init(&bitlen); - if(!uivector_resize(&bitlen, NUM_DEFLATE_CODE_SYMBOLS)) error = 9909; - - if(!error) - { - /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ - for(i = 0; i <= 143; i++) bitlen.data[i] = 8; - for(i = 144; i <= 255; i++) bitlen.data[i] = 9; - for(i = 256; i <= 279; i++) bitlen.data[i] = 7; - for(i = 280; i <= 287; i++) bitlen.data[i] = 8; - - error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DEFLATE_CODE_SYMBOLS, 15); - } - - uivector_cleanup(&bitlen); - return error; -} - -static unsigned generateDistanceTree(HuffmanTree* tree) -{ - unsigned i, error = 0; - uivector bitlen; - uivector_init(&bitlen); - if(!uivector_resize(&bitlen, NUM_DISTANCE_SYMBOLS)) error = 9910; - - /*there are 32 distance codes, but 30-31 are unused*/ - if(!error) - { - for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen.data[i] = 5; - error = HuffmanTree_makeFromLengths(tree, bitlen.data, NUM_DISTANCE_SYMBOLS, 15); - } - uivector_cleanup(&bitlen); - return error; -} - -#ifdef LODEPNG_COMPILE_DECODER - -/*Decodes a symbol from the tree -if decoded is true, then result contains the symbol, otherwise it contains something unspecified (because the symbol isn't fully decoded yet) -bit is the bit that was just read from the stream -you have to decode a full symbol (let the decode function return true) before you can try to decode another one, otherwise the state isn't reset -return value is error.*/ -static unsigned HuffmanTree_decode(const HuffmanTree* tree, unsigned* decoded, unsigned* result, unsigned* treepos, unsigned char bit) -{ - if((*treepos) >= tree->numcodes) return 11; /*error: it appeared outside the codetree*/ - - (*result) = tree->tree2d.data[2 * (*treepos) + bit]; - (*decoded) = ((*result) < tree->numcodes); - - if(*decoded) (*treepos) = 0; - else (*treepos) = (*result) - tree->numcodes; - - return 0; -} - -static unsigned huffmanDecodeSymbol(unsigned int* error, const unsigned char* in, size_t* bp, const HuffmanTree* codetree, size_t inlength) -{ - unsigned treepos = 0, decoded, ct; - for(;;) - { - unsigned char bit; - if(((*bp) & 0x07) == 0 && ((*bp) >> 3) > inlength) { *error = 10; return 0; } /*error: end of input memory reached without endcode*/ - bit = readBitFromStream(bp, in); - *error = HuffmanTree_decode(codetree, &decoded, &ct, &treepos, bit); - if(*error) return 0; /*stop, an error happened*/ - if(decoded) return ct; - } -} - -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_DECODER - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Inflator / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ -static void getTreeInflateFixed(HuffmanTree* tree, HuffmanTree* treeD) -{ - /*error checking not done, this is fixed stuff, it works, it doesn't depend on the image*/ - generateFixedTree(tree); - generateDistanceTree(treeD); -} - -/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ -static unsigned getTreeInflateDynamic(HuffmanTree* codetree, HuffmanTree* codetreeD, HuffmanTree* codelengthcodetree, - const unsigned char* in, size_t* bp, size_t inlength) -{ - /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ - /*C-code note: use no "return" between ctor and dtor of an uivector!*/ - unsigned error = 0; - unsigned n, HLIT, HDIST, HCLEN, i; - uivector bitlen; - uivector bitlenD; - uivector codelengthcode; - - if((*bp) >> 3 >= inlength - 2) { return 49; } /*the bit pointer is or will go past the memory*/ - - HLIT = readBitsFromStream(bp, in, 5) + 257; /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ - HDIST = readBitsFromStream(bp, in, 5) + 1; /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ - HCLEN = readBitsFromStream(bp, in, 4) + 4; /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ - - /*read the code length codes out of 3 * (amount of code length codes) bits*/ - uivector_init(&codelengthcode); - if(!uivector_resize(&codelengthcode, NUM_CODE_LENGTH_CODES)) error = 9911; - - if(!error) - { - for(i = 0; i < NUM_CODE_LENGTH_CODES; i++) - { - if(i < HCLEN) codelengthcode.data[CLCL[i]] = readBitsFromStream(bp, in, 3); - else codelengthcode.data[CLCL[i]] = 0; /*if not, it must stay 0*/ - } - - error = HuffmanTree_makeFromLengths(codelengthcodetree, codelengthcode.data, codelengthcode.size, 7); - } - - uivector_cleanup(&codelengthcode); - if(error) return error; - - /*now we can use this tree to read the lengths for the tree that this function will return*/ - uivector_init(&bitlen); - uivector_resizev(&bitlen, NUM_DEFLATE_CODE_SYMBOLS, 0); - uivector_init(&bitlenD); - uivector_resizev(&bitlenD, NUM_DISTANCE_SYMBOLS, 0); - i = 0; - if(!bitlen.data || !bitlenD.data) error = 9912; - else while(i < HLIT + HDIST) /*i is the current symbol we're reading in the part that contains the code lengths of lit/len codes and dist codes*/ - { - unsigned code = huffmanDecodeSymbol(&error, in, bp, codelengthcodetree, inlength); - if(error) break; - - if(code <= 15) /*a length code*/ - { - if(i < HLIT) bitlen.data[i] = code; - else bitlenD.data[i - HLIT] = code; - i++; - } - else if(code == 16) /*repeat previous*/ - { - unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ - unsigned value; /*set value to the previous code*/ - - if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ - - replength += readBitsFromStream(bp, in, 2); - - if((i - 1) < HLIT) value = bitlen.data[i - 1]; - else value = bitlenD.data[i - HLIT - 1]; - /*repeat this value in the next lengths*/ - for(n = 0; n < replength; n++) - { - if(i >= HLIT + HDIST) { error = 13; break; } /*error: i is larger than the amount of codes*/ - if(i < HLIT) bitlen.data[i] = value; - else bitlenD.data[i - HLIT] = value; - i++; - } - } - else if(code == 17) /*repeat "0" 3-10 times*/ - { - unsigned replength = 3; /*read in the bits that indicate repeat length*/ - if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ - - replength += readBitsFromStream(bp, in, 3); - - /*repeat this value in the next lengths*/ - for(n = 0; n < replength; n++) - { - if(i >= HLIT + HDIST) { error = 14; break; } /*error: i is larger than the amount of codes*/ - if(i < HLIT) bitlen.data[i] = 0; - else bitlenD.data[i - HLIT] = 0; - i++; - } - } - else if(code == 18) /*repeat "0" 11-138 times*/ - { - unsigned replength = 11; /*read in the bits that indicate repeat length*/ - if((*bp) >> 3 >= inlength) { error = 50; break; } /*error, bit pointer jumps past memory*/ - replength += readBitsFromStream(bp, in, 7); - - /*repeat this value in the next lengths*/ - for(n = 0; n < replength; n++) - { - if(i >= HLIT + HDIST) { error = 15; break; } /*error: i is larger than the amount of codes*/ - if(i < HLIT) bitlen.data[i] = 0; - else bitlenD.data[i - HLIT] = 0; - i++; - } - } - else { error = 16; break; } /*error: somehow an unexisting code appeared. This can never happen.*/ - } - - if(!error && bitlen.data[256] == 0) { error = 64; } /*the length of the end code 256 must be larger than 0*/ - - /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/ - if(!error) error = HuffmanTree_makeFromLengths(codetree, &bitlen.data[0], bitlen.size, 15); - if(!error) error = HuffmanTree_makeFromLengths(codetreeD, &bitlenD.data[0], bitlenD.size, 15); - - uivector_cleanup(&bitlen); - uivector_cleanup(&bitlenD); - - return error; -} - -/*inflate a block with dynamic of fixed Huffman tree*/ -static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength, unsigned btype) -{ - unsigned endreached = 0, error = 0; - HuffmanTree codetree; /*287, the code tree for Huffman codes*/ - HuffmanTree codetreeD; /*31, the code tree for distance codes*/ - - HuffmanTree_init(&codetree); - HuffmanTree_init(&codetreeD); - - if(btype == 1) getTreeInflateFixed(&codetree, &codetreeD); - else if(btype == 2) - { - HuffmanTree codelengthcodetree; /*18, the code tree for code length codes*/ - HuffmanTree_init(&codelengthcodetree); - error = getTreeInflateDynamic(&codetree, &codetreeD, &codelengthcodetree, in, bp, inlength); - HuffmanTree_cleanup(&codelengthcodetree); - } - - while(!endreached && !error) - { - unsigned code = huffmanDecodeSymbol(&error, in, bp, &codetree, inlength); - if(error) break; /*some error happened in the above function*/ - if(code == 256) endreached = 1; /*end code*/ - else if(code <= 255) /*literal symbol*/ - { - if((*pos) >= out->size) ucvector_resize(out, ((*pos) + 1) * 2); /*reserve more room at once*/ - if((*pos) >= out->size) { error = 9913; break; } /*not enough memory*/ - out->data[(*pos)] = (unsigned char)(code); - (*pos)++; - } - else if(code >= FIRST_LENGTH_CODE_INDEX && code <= LAST_LENGTH_CODE_INDEX) /*length code*/ - { - /*part 1: get length base*/ - size_t length = LENGTHBASE[code - FIRST_LENGTH_CODE_INDEX]; - unsigned codeD, distance, numextrabitsD; - size_t start, forward, backward, numextrabits; - - /*part 2: get extra bits and add the value of that to length*/ - numextrabits = LENGTHEXTRA[code - FIRST_LENGTH_CODE_INDEX]; - if(((*bp) >> 3) >= inlength) { error = 51; break; } /*error, bit pointer will jump past memory*/ - length += readBitsFromStream(bp, in, numextrabits); - - /*part 3: get distance code*/ - codeD = huffmanDecodeSymbol(&error, in, bp, &codetreeD, inlength); - if(error) break; - if(codeD > 29) { error = 18; break; } /*error: invalid distance code (30-31 are never used)*/ - distance = DISTANCEBASE[codeD]; - - /*part 4: get extra bits from distance*/ - numextrabitsD = DISTANCEEXTRA[codeD]; - if(((*bp) >> 3) >= inlength) { error = 51; break; } /*error, bit pointer will jump past memory*/ - distance += readBitsFromStream(bp, in, numextrabitsD); - - /*part 5: fill in all the out[n] values based on the length and dist*/ - start = (*pos); - backward = start - distance; - if((*pos) + length >= out->size) ucvector_resize(out, ((*pos) + length) * 2); /*reserve more room at once*/ - if((*pos) + length >= out->size) { error = 9914; break; } /*not enough memory*/ - - for(forward = 0; forward < length; forward++) - { - out->data[(*pos)] = out->data[backward]; - (*pos)++; - backward++; - if(backward >= start) backward = start - distance; - } - } - } - - HuffmanTree_cleanup(&codetree); - HuffmanTree_cleanup(&codetreeD); - - return error; -} - -static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength) -{ - /*go to first boundary of byte*/ - size_t p; - unsigned LEN, NLEN, n, error = 0; - while(((*bp) & 0x7) != 0) (*bp)++; - p = (*bp) / 8; /*byte position*/ - - /*read LEN (2 bytes) and NLEN (2 bytes)*/ - if(p >= inlength - 4) return 52; /*error, bit pointer will jump past memory*/ - LEN = in[p] + 256 * in[p + 1]; p += 2; - NLEN = in[p] + 256 * in[p + 1]; p += 2; - - /*check if 16-bit NLEN is really the one's complement of LEN*/ - if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/ - - if((*pos) + LEN >= out->size) { if(!ucvector_resize(out, (*pos) + LEN)) return 9915; } - - /*read the literal data: LEN bytes are now stored in the out buffer*/ - if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/ - for(n = 0; n < LEN; n++) out->data[(*pos)++] = in[p++]; - - (*bp) = p * 8; - - return error; -} - -/*inflate the deflated data (cfr. deflate spec); return value is the error*/ -unsigned LodeFlate_inflate(ucvector* out, const unsigned char* in, size_t insize, size_t inpos) -{ - size_t bp = 0; /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/ - unsigned BFINAL = 0; - size_t pos = 0; /*byte position in the out buffer*/ - - unsigned error = 0; - - while(!BFINAL) - { - unsigned BTYPE; - if((bp >> 3) >= insize) return 52; /*error, bit pointer will jump past memory*/ - BFINAL = readBitFromStream(&bp, &in[inpos]); - BTYPE = 1 * readBitFromStream(&bp, &in[inpos]); BTYPE += 2 * readBitFromStream(&bp, &in[inpos]); - - if(BTYPE == 3) return 20; /*error: invalid BTYPE*/ - else if(BTYPE == 0) error = inflateNoCompression(out, &in[inpos], &bp, &pos, insize); /*no compression*/ - else error = inflateHuffmanBlock(out, &in[inpos], &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/ - if(error) return error; - } - - if(!ucvector_resize(out, pos)) error = 9916; /*Only now we know the true size of out, resize it to that*/ - - return error; -} - -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Deflator / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258; - -/*bitlen is the size in bits of the code*/ -static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen) -{ - addBitsToStreamReversed(bp, compressed, code, bitlen); -} - -/*search the index in the array, that has the largest value smaller than or equal to the given value, given array must be sorted (if no value is smaller, it returns the size of the given array)*/ -static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) -{ - /*linear search implementation*/ - /*for(size_t i = 1; i < array_size; i++) if(array[i] > value) return i - 1; - return array_size - 1;*/ - - /*binary search implementation (not that much faster) (precondition: array_size > 0)*/ - size_t left = 1; - size_t right = array_size - 1; - while(left <= right) - { - size_t mid = (left + right) / 2; - if(array[mid] <= value) left = mid + 1; /*the value to find is more to the right*/ - else if(array[mid - 1] > value) right = mid - 1; /*the value to find is more to the left*/ - else return mid - 1; - } - return array_size - 1; -} - -static void addLengthDistance(uivector* values, size_t length, size_t distance) -{ - /*values in encoded vector are those used by deflate: - 0-255: literal bytes - 256: end - 257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits) - 286-287: invalid*/ - - unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length); - unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]); - unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance); - unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]); - - uivector_push_back(values, length_code + FIRST_LENGTH_CODE_INDEX); - uivector_push_back(values, extra_length); - uivector_push_back(values, dist_code); - uivector_push_back(values, extra_distance); -} - -#if 0 -/*the "brute force" version of the encodeLZ7 algorithm, not used anymore, kept here for reference*/ -static void encodeLZ77_brute(uivector* out, const unsigned char* in, size_t size, unsigned windowSize) -{ - size_t pos; - /*using pointer instead of vector for input makes it faster when NOT using optimization when compiling; no influence if optimization is used*/ - for(pos = 0; pos < size; pos++) - { - size_t length = 0, offset = 0; /*the length and offset found for the current position*/ - size_t max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/ - size_t current_offset; - - /**search for the longest string**/ - for(current_offset = 1; current_offset < max_offset; current_offset++) /*search backwards through all possible distances (=offsets)*/ - { - size_t backpos = pos - current_offset; - if(in[backpos] == in[pos]) - { - /*test the next characters*/ - size_t current_length = 1; - size_t backtest = backpos + 1; - size_t foretest = pos + 1; - while(foretest < size && in[backtest] == in[foretest] && current_length < MAX_SUPPORTED_DEFLATE_LENGTH) /*maximum supporte length by deflate is max length*/ - { - if(backpos >= pos) backpos -= current_offset; /*continue as if we work on the decoded bytes after pos by jumping back before pos*/ - current_length++; - backtest++; - foretest++; - } - if(current_length > length) - { - length = current_length; /*the longest length*/ - offset = current_offset; /*the offset that is related to this longest length*/ - if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break; /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/ - } - } - } - - /**encode it as length/distance pair or literal value**/ - if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ - { - uivector_push_back(out, in[pos]); - } - else - { - addLengthDistance(out, length, offset); - pos += (length - 1); - } - } /*end of the loop through each character of input*/ -} -#endif - -static const unsigned HASH_NUM_VALUES = 65536; -static const unsigned HASH_NUM_CHARACTERS = 6; -static const unsigned HASH_SHIFT = 2; -/* -Good and fast values: HASH_NUM_VALUES=65536, HASH_NUM_CHARACTERS=6, HASH_SHIFT=2 -making HASH_NUM_CHARACTERS larger (like 8), makes the file size larger but is a bit faster -making HASH_NUM_CHARACTERS smaller (like 3), makes the file size smaller but is slower -*/ - -static unsigned getHash(const unsigned char* data, size_t size, size_t pos) -{ - unsigned result = 0; - size_t amount, i; - if(pos >= size) return 0; - amount = HASH_NUM_CHARACTERS; if(pos + amount >= size) amount = size - pos; - for(i = 0; i < amount; i++) result ^= (data[pos + i] << (i * HASH_SHIFT)); - return result % HASH_NUM_VALUES; -} - -/*LZ77-encode the data using a hash table technique to let it encode faster. Return value is error code*/ -static unsigned encodeLZ77(uivector* out, const unsigned char* in, size_t size, unsigned windowSize) -{ - /**generate hash table**/ - png_vector table; /*HASH_NUM_VALUES uivectors; this represents what would be an std::vector<std::vector<unsigned> > in C++*/ - uivector tablepos1, tablepos2; - unsigned pos, i, error = 0; - - vector_init(&table, sizeof(uivector)); - if(!vector_resize(&table, HASH_NUM_VALUES)) return 9917; - for(i = 0; i < HASH_NUM_VALUES; i++) - { - uivector* v = (uivector*)vector_get(&table, i); - uivector_init(v); - } - - /*remember start and end positions in the tables to searching in*/ - uivector_init(&tablepos1); - uivector_init(&tablepos2); - if(!uivector_resizev(&tablepos1, HASH_NUM_VALUES, 0)) error = 9918; - if(!uivector_resizev(&tablepos2, HASH_NUM_VALUES, 0)) error = 9919; - - if(!error) - { - for(pos = 0; pos < size; pos++) - { - unsigned length = 0, offset = 0; /*the length and offset found for the current position*/ - unsigned max_offset = pos < windowSize ? pos : windowSize; /*how far back to test*/ - unsigned tablepos; - - /*/search for the longest string*/ - /*first find out where in the table to start (the first value that is in the range from "pos - max_offset" to "pos")*/ - unsigned hash = getHash(in, size, pos); - if(!uivector_push_back((uivector*)vector_get(&table, hash), pos)) { error = 9920; break; } - - while(((uivector*)vector_get(&table, hash))->data[tablepos1.data[hash]] < pos - max_offset) tablepos1.data[hash]++; /*it now points to the first value in the table for which the index is larger than or equal to pos - max_offset*/ - while(((uivector*)vector_get(&table, hash))->data[tablepos2.data[hash]] < pos) tablepos2.data[hash]++; /*it now points to the first value in the table for which the index is larger than or equal to pos*/ - - for(tablepos = tablepos2.data[hash] - 1; tablepos >= tablepos1.data[hash] && tablepos < tablepos2.data[hash]; tablepos--) - { - unsigned backpos = ((uivector*)vector_get(&table, hash))->data[tablepos]; - unsigned current_offset = pos - backpos; - - /*test the next characters*/ - unsigned current_length = 0; - unsigned backtest = backpos; - unsigned foretest = pos; - while(foretest < size && in[backtest] == in[foretest] && current_length < MAX_SUPPORTED_DEFLATE_LENGTH) /*maximum supporte length by deflate is max length*/ - { - if(backpos >= pos) backpos -= current_offset; /*continue as if we work on the decoded bytes after pos by jumping back before pos*/ - current_length++; - backtest++; - foretest++; - } - if(current_length > length) - { - length = current_length; /*the longest length*/ - offset = current_offset; /*the offset that is related to this longest length*/ - if(current_length == MAX_SUPPORTED_DEFLATE_LENGTH) break; /*you can jump out of this for loop once a length of max length is found (gives significant speed gain)*/ - } - } - - /**encode it as length/distance pair or literal value**/ - if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ - { - if(!uivector_push_back(out, in[pos])) { error = 9921; break; } - } - else - { - unsigned j; - addLengthDistance(out, length, offset); - for(j = 0; j < length - 1; j++) - { - pos++; - if(!uivector_push_back((uivector*)vector_get(&table, getHash(in, size, pos)), pos)) { error = 9922; break; } - } - } - } /*end of the loop through each character of input*/ - } /*end of "if(!error)"*/ - - /*cleanup*/ - for(i = 0; i < table.size; i++) - { - uivector* v = (uivector*)vector_get(&table, i); - uivector_cleanup(v); - } - vector_cleanup(&table); - uivector_cleanup(&tablepos1); - uivector_cleanup(&tablepos2); - return error; -} - -/* /////////////////////////////////////////////////////////////////////////// */ - -static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) -{ - /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ - - size_t i, j, numdeflateblocks = datasize / 65536 + 1; - unsigned datapos = 0; - for(i = 0; i < numdeflateblocks; i++) - { - unsigned BFINAL, BTYPE, LEN, NLEN; - unsigned char firstbyte; - - BFINAL = (i == numdeflateblocks - 1); - BTYPE = 0; - - firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1)); - ucvector_push_back(out, firstbyte); - - LEN = 65535; - if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos; - NLEN = 65535 - LEN; - - ucvector_push_back(out, (unsigned char)(LEN % 256)); - ucvector_push_back(out, (unsigned char)(LEN / 256)); - ucvector_push_back(out, (unsigned char)(NLEN % 256)); - ucvector_push_back(out, (unsigned char)(NLEN / 256)); - - /*Decompressed data*/ - for(j = 0; j < 65535 && datapos < datasize; j++) - { - ucvector_push_back(out, data[datapos++]); - } - } - - return 0; -} - -/*write the encoded data, using lit/len as well as distance codes*/ -static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded, const HuffmanTree* codes, const HuffmanTree* codesD) -{ - size_t i = 0; - for(i = 0; i < lz77_encoded->size; i++) - { - unsigned val = lz77_encoded->data[i]; - addHuffmanSymbol(bp, out, HuffmanTree_getCode(codes, val), HuffmanTree_getLength(codes, val)); - if(val > 256) /*for a length code, 3 more things have to be added*/ - { - unsigned length_index = val - FIRST_LENGTH_CODE_INDEX; - unsigned n_length_extra_bits = LENGTHEXTRA[length_index]; - unsigned length_extra_bits = lz77_encoded->data[++i]; - - unsigned distance_code = lz77_encoded->data[++i]; - - unsigned distance_index = distance_code; - unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index]; - unsigned distance_extra_bits = lz77_encoded->data[++i]; - - addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits); - addHuffmanSymbol(bp, out, HuffmanTree_getCode(codesD, distance_code), HuffmanTree_getLength(codesD, distance_code)); - addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits); - } - } -} - -static unsigned deflateDynamic(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) -{ - /* - after the BFINAL and BTYPE, the dynamic block consists out of the following: - - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN - - (HCLEN+4)*3 bits code lengths of code length alphabet - - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) - - HDIST + 1 code lengths of distance alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) - - compressed data - - 256 (end code) - */ - - unsigned error = 0; - - uivector lz77_encoded; - HuffmanTree codes; /*tree for literal values and length codes*/ - HuffmanTree codesD; /*tree for distance codes*/ - HuffmanTree codelengthcodes; - uivector frequencies; - uivector frequenciesD; - uivector amounts; /*the amounts in the "normal" order*/ - uivector lldl; - uivector lldll; /*lit/len & dist code lenghts*/ - uivector clcls; - - unsigned BFINAL = 1; /*make only one block... the first and final one*/ - size_t numcodes, numcodesD, i, bp = 0; /*the bit pointer*/ - unsigned HLIT, HDIST, HCLEN; - - uivector_init(&lz77_encoded); - HuffmanTree_init(&codes); - HuffmanTree_init(&codesD); - HuffmanTree_init(&codelengthcodes); - uivector_init(&frequencies); - uivector_init(&frequenciesD); - uivector_init(&amounts); - uivector_init(&lldl); - uivector_init(&lldll); - uivector_init(&clcls); - - while(!error) /*the goto-avoiding while construct: break out to go to the cleanup phase, a break at the end makes sure the while is never repeated*/ - { - if(settings->useLZ77) - { - error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize); /*LZ77 encoded*/ - if(error) break; - } - else - { - if(!uivector_resize(&lz77_encoded, datasize)) { error = 9923; break; } - for(i = 0; i < datasize; i++) lz77_encoded.data[i] = data[i]; /*no LZ77, but still will be Huffman compressed*/ - } - - if(!uivector_resizev(&frequencies, 286, 0)) { error = 9924; break; } - if(!uivector_resizev(&frequenciesD, 30, 0)) { error = 9925; break; } - for(i = 0; i < lz77_encoded.size; i++) - { - unsigned symbol = lz77_encoded.data[i]; - frequencies.data[symbol]++; - if(symbol > 256) - { - unsigned dist = lz77_encoded.data[i + 2]; - frequenciesD.data[dist]++; - i += 3; - } - } - frequencies.data[256] = 1; /*there will be exactly 1 end code, at the end of the block*/ - - error = HuffmanTree_makeFromFrequencies(&codes, frequencies.data, frequencies.size, 15); - if(error) break; - error = HuffmanTree_makeFromFrequencies(&codesD, frequenciesD.data, frequenciesD.size, 15); - if(error) break; - - addBitToStream(&bp, out, BFINAL); - addBitToStream(&bp, out, 0); /*first bit of BTYPE "dynamic"*/ - addBitToStream(&bp, out, 1); /*second bit of BTYPE "dynamic"*/ - - numcodes = codes.numcodes; if(numcodes > 286) numcodes = 286; - numcodesD = codesD.numcodes; if(numcodesD > 30) numcodesD = 30; - for(i = 0; i < numcodes; i++) uivector_push_back(&lldll, HuffmanTree_getLength(&codes, (unsigned)i)); - for(i = 0; i < numcodesD; i++) uivector_push_back(&lldll, HuffmanTree_getLength(&codesD, (unsigned)i)); - - /*make lldl smaller by using repeat codes 16 (copy length 3-6 times), 17 (3-10 zeroes), 18 (11-138 zeroes)*/ - for(i = 0; i < (unsigned)lldll.size; i++) - { - unsigned j = 0; - while(i + j + 1 < (unsigned)lldll.size && lldll.data[i + j + 1] == lldll.data[i]) j++; - - if(lldll.data[i] == 0 && j >= 2) - { - j++; /*include the first zero*/ - if(j <= 10) { uivector_push_back(&lldl, 17); uivector_push_back(&lldl, j - 3); } - else - { - if(j > 138) j = 138; - uivector_push_back(&lldl, 18); uivector_push_back(&lldl, j - 11); - } - i += (j - 1); - } - else if(j >= 3) - { - size_t k; - unsigned num = j / 6, rest = j % 6; - uivector_push_back(&lldl, lldll.data[i]); - for(k = 0; k < num; k++) { uivector_push_back(&lldl, 16); uivector_push_back(&lldl, 6 - 3); } - if(rest >= 3) { uivector_push_back(&lldl, 16); uivector_push_back(&lldl, rest - 3); } - else j -= rest; - i += j; - } - else uivector_push_back(&lldl, lldll.data[i]); - } - - /*generate huffmantree for the length codes of lit/len and dist codes*/ - if(!uivector_resizev(&amounts, 19, 0)) { error = 9926; break; } /*16 possible lengths (0-15) and 3 repeat codes (16, 17 and 18)*/ - for(i = 0; i < lldl.size; i++) - { - amounts.data[lldl.data[i]]++; - if(lldl.data[i] >= 16) i++; /*after a repeat code come the bits that specify the amount, those don't need to be in the amounts calculation*/ - } - - error = HuffmanTree_makeFromFrequencies(&codelengthcodes, amounts.data, amounts.size, 7); - if(error) break; - - if(!uivector_resize(&clcls, 19)) { error = 9927; break; } - for(i = 0; i < 19; i++) clcls.data[i] = HuffmanTree_getLength(&codelengthcodes, CLCL[i]); /*lenghts of code length tree is in the order as specified by deflate*/ - while(clcls.data[clcls.size - 1] == 0 && clcls.size > 4) - { - if(!uivector_resize(&clcls, clcls.size - 1)) { error = 9928; break; } /*remove zeros at the end, but minimum size must be 4*/ - } - if(error) break; - - /*write the HLIT, HDIST and HCLEN values*/ - HLIT = (unsigned)(numcodes - 257); - HDIST = (unsigned)(numcodesD - 1); - HCLEN = (unsigned)clcls.size - 4; - addBitsToStream(&bp, out, HLIT, 5); - addBitsToStream(&bp, out, HDIST, 5); - addBitsToStream(&bp, out, HCLEN, 4); - - /*write the code lenghts of the code length alphabet*/ - for(i = 0; i < HCLEN + 4; i++) addBitsToStream(&bp, out, clcls.data[i], 3); - - /*write the lenghts of the lit/len AND the dist alphabet*/ - for(i = 0; i < lldl.size; i++) - { - addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codelengthcodes, lldl.data[i]), HuffmanTree_getLength(&codelengthcodes, lldl.data[i])); - /*extra bits of repeat codes*/ - if(lldl.data[i] == 16) addBitsToStream(&bp, out, lldl.data[++i], 2); - else if(lldl.data[i] == 17) addBitsToStream(&bp, out, lldl.data[++i], 3); - else if(lldl.data[i] == 18) addBitsToStream(&bp, out, lldl.data[++i], 7); - } - - /*write the compressed data symbols*/ - writeLZ77data(&bp, out, &lz77_encoded, &codes, &codesD); - if(HuffmanTree_getLength(&codes, 256) == 0) { error = 64; break; } /*the length of the end code 256 must be larger than 0*/ - addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, 256), HuffmanTree_getLength(&codes, 256)); /*end code*/ - - break; /*end of error-while*/ - } - - /*cleanup*/ - uivector_cleanup(&lz77_encoded); - HuffmanTree_cleanup(&codes); - HuffmanTree_cleanup(&codesD); - HuffmanTree_cleanup(&codelengthcodes); - uivector_cleanup(&frequencies); - uivector_cleanup(&frequenciesD); - uivector_cleanup(&amounts); - uivector_cleanup(&lldl); - uivector_cleanup(&lldll); - uivector_cleanup(&clcls); - - return error; -} - -static unsigned deflateFixed(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) -{ - HuffmanTree codes; /*tree for literal values and length codes*/ - HuffmanTree codesD; /*tree for distance codes*/ - - unsigned BFINAL = 1; /*make only one block... the first and final one*/ - unsigned error = 0; - size_t i, bp = 0; /*the bit pointer*/ - - HuffmanTree_init(&codes); - HuffmanTree_init(&codesD); - - generateFixedTree(&codes); - generateDistanceTree(&codesD); - - addBitToStream(&bp, out, BFINAL); - addBitToStream(&bp, out, 1); /*first bit of BTYPE*/ - addBitToStream(&bp, out, 0); /*second bit of BTYPE*/ - - if(settings->useLZ77) /*LZ77 encoded*/ - { - uivector lz77_encoded; - uivector_init(&lz77_encoded); - error = encodeLZ77(&lz77_encoded, data, datasize, settings->windowSize); - if(!error) writeLZ77data(&bp, out, &lz77_encoded, &codes, &codesD); - uivector_cleanup(&lz77_encoded); - } - else /*no LZ77, but still will be Huffman compressed*/ - { - for(i = 0; i < datasize; i++) addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, data[i]), HuffmanTree_getLength(&codes, data[i])); - } - if(!error) addHuffmanSymbol(&bp, out, HuffmanTree_getCode(&codes, 256), HuffmanTree_getLength(&codes, 256)); /*"end" code*/ - - /*cleanup*/ - HuffmanTree_cleanup(&codes); - HuffmanTree_cleanup(&codesD); - - return error; -} - -unsigned LodeFlate_deflate(ucvector* out, const unsigned char* data, size_t datasize, const LodeZlib_DeflateSettings* settings) -{ - unsigned error = 0; - if(settings->btype == 0) error = deflateNoCompression(out, data, datasize); - else if(settings->btype == 1) error = deflateFixed(out, data, datasize, settings); - else if(settings->btype == 2) error = deflateDynamic(out, data, datasize, settings); - else error = 61; - return error; -} - -#endif /*LODEPNG_COMPILE_DECODER*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Adler32 */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) -{ - unsigned s1 = adler & 0xffff; - unsigned s2 = (adler >> 16) & 0xffff; - - while(len > 0) - { - /*at least 5550 sums can be done before the sums overflow, saving us from a lot of module divisions*/ - unsigned amount = len > 5550 ? 5550 : len; - len -= amount; - while(amount > 0) - { - s1 = (s1 + *data++); - s2 = (s2 + s1); - amount--; - } - s1 %= 65521; - s2 %= 65521; - } - - return (s2 << 16) | s1; -} - -/*Return the adler32 of the bytes data[0..len-1]*/ -static unsigned adler32(const unsigned char* data, unsigned len) -{ - return update_adler32(1L, data, len); -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Reading and writing single bits and bytes from/to stream for Zlib / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ENCODER -void LodeZlib_add32bitInt(ucvector* buffer, unsigned value) -{ - ucvector_push_back(buffer, (unsigned char)((value >> 24) & 0xff)); - ucvector_push_back(buffer, (unsigned char)((value >> 16) & 0xff)); - ucvector_push_back(buffer, (unsigned char)((value >> 8) & 0xff)); - ucvector_push_back(buffer, (unsigned char)((value ) & 0xff)); -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - -unsigned LodeZlib_read32bitInt(const unsigned char* buffer) -{ - return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Zlib / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_DECODER - -unsigned LodeZlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings) -{ - unsigned error = 0; - unsigned CM, CINFO, FDICT; - ucvector outv; - - if(insize < 2) { error = 53; return error; } /*error, size of zlib data too small*/ - /*read information from zlib header*/ - if((in[0] * 256 + in[1]) % 31 != 0) { error = 24; return error; } /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ - - CM = in[0] & 15; - CINFO = (in[0] >> 4) & 15; - /*FCHECK = in[1] & 31; //FCHECK is already tested above*/ - FDICT = (in[1] >> 5) & 1; - /*FLEVEL = (in[1] >> 6) & 3; //not really important, all it does it to give a compiler warning about unused variable, we don't care what encoding setting the encoder used*/ - - if(CM != 8 || CINFO > 7) { error = 25; return error; } /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ - if(FDICT != 0) { error = 26; return error; } /*error: the specification of PNG says about the zlib stream: "The additional flags shall not specify a preset dictionary."*/ - - ucvector_init_buffer(&outv, *out, *outsize); /*ucvector-controlled version of the output buffer, for dynamic array*/ - error = LodeFlate_inflate(&outv, in, insize, 2); - *out = outv.data; - *outsize = outv.size; - if(error) return error; - - if(!settings->ignoreAdler32) - { - unsigned ADLER32 = LodeZlib_read32bitInt(&in[insize - 4]); - unsigned checksum = adler32(outv.data, (unsigned)outv.size); - if(checksum != ADLER32) { error = 58; return error; } - } - - return error; -} - -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER - -unsigned LodeZlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings) -{ - /*initially, *out must be NULL and outsize 0, if you just give some random *out that's pointing to a non allocated buffer, this'll crash*/ - ucvector deflatedata, outv; - size_t i; - unsigned error; - - unsigned ADLER32; - /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ - unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ - unsigned FLEVEL = 0; - unsigned FDICT = 0; - unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; - unsigned FCHECK = 31 - CMFFLG % 31; - CMFFLG += FCHECK; - - ucvector_init_buffer(&outv, *out, *outsize); /*ucvector-controlled version of the output buffer, for dynamic array*/ - - ucvector_push_back(&outv, (unsigned char)(CMFFLG / 256)); - ucvector_push_back(&outv, (unsigned char)(CMFFLG % 256)); - - ucvector_init(&deflatedata); - error = LodeFlate_deflate(&deflatedata, in, insize, settings); - - if(!error) - { - ADLER32 = adler32(in, (unsigned)insize); - for(i = 0; i < deflatedata.size; i++) ucvector_push_back(&outv, deflatedata.data[i]); - ucvector_cleanup(&deflatedata); - LodeZlib_add32bitInt(&outv, ADLER32); - } - - *out = outv.data; - *outsize = outv.size; - - return error; -} - -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#endif /*LODEPNG_COMPILE_ZLIB*/ - -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ENCODER - -void LodeZlib_DeflateSettings_init(LodeZlib_DeflateSettings* settings) -{ - settings->btype = 2; /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/ - settings->useLZ77 = 1; - settings->windowSize = 2048; /*this is a good tradeoff between speed and compression ratio*/ -} - -const LodeZlib_DeflateSettings LodeZlib_defaultDeflateSettings = {2, 1, 2048}; - -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#ifdef LODEPNG_COMPILE_DECODER - -void LodeZlib_DecompressSettings_init(LodeZlib_DecompressSettings* settings) -{ - settings->ignoreAdler32 = 0; -} - -const LodeZlib_DecompressSettings LodeZlib_defaultDecompressSettings = {0}; - -#endif /*LODEPNG_COMPILE_DECODER*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* // End of Zlib related code, now comes the PNG related code that uses it// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_PNG - -/* -The two functions below (LodePNG_decompress and LodePNG_compress) directly call the -LodeZlib_decompress and LodeZlib_compress functions. The only purpose of the functions -below, is to provide the ability to let LodePNG use a different Zlib encoder by only -changing the two functions below, instead of changing it inside the vareous places -in the other LodePNG functions. - -*out must be NULL and *outsize must be 0 initially, and after the function is done, -*out must point to the decompressed data, *outsize must be the size of it, and must -be the size of the useful data in bytes, not the alloc size. -*/ - -#ifdef LODEPNG_COMPILE_DECODER -static unsigned LodePNG_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings) -{ - return LodeZlib_decompress(out, outsize, in, insize, settings); -} -#endif /*LODEPNG_COMPILE_DECODER*/ -#ifdef LODEPNG_COMPILE_ENCODER -static unsigned LodePNG_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings) -{ - return LodeZlib_compress(out, outsize, in, insize, settings); -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / CRC32 / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned Crc32_crc_table_computed = 0; -static unsigned Crc32_crc_table[256]; - -/*Make the table for a fast CRC.*/ -static void Crc32_make_crc_table(void) -{ - unsigned c, k, n; - for(n = 0; n < 256; n++) - { - c = n; - for(k = 0; k < 8; k++) - { - if(c & 1) c = 0xedb88320L ^ (c >> 1); - else c = c >> 1; - } - Crc32_crc_table[n] = c; - } - Crc32_crc_table_computed = 1; -} - -/*Update a running CRC with the bytes buf[0..len-1]--the CRC should be -initialized to all 1's, and the transmitted value is the 1's complement of the -final running CRC (see the crc() routine below).*/ -static unsigned Crc32_update_crc(const unsigned char* buf, unsigned crc, size_t len) -{ - unsigned c = crc; - size_t n; - - if(!Crc32_crc_table_computed) Crc32_make_crc_table(); - for(n = 0; n < len; n++) - { - c = Crc32_crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8); - } - return c; -} - -/*Return the CRC of the bytes buf[0..len-1].*/ -static unsigned Crc32_crc(const unsigned char* buf, size_t len) -{ - return Crc32_update_crc(buf, 0xffffffffL, len) ^ 0xffffffffL; -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Reading and writing single bits and bytes from/to stream for LodePNG / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) -{ - unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); - (*bitpointer)++; - return result; -} - -static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) -{ - unsigned result = 0; - size_t i; - for(i = nbits - 1; i < nbits; i--) result += (unsigned)readBitFromReversedStream(bitpointer, bitstream) << i; - return result; -} - -#ifdef LODEPNG_COMPILE_DECODER -static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) -{ - /*the current bit in bitstream must be 0 for this to work*/ - if(bit) bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7))); /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ - (*bitpointer)++; -} -#endif /*LODEPNG_COMPILE_DECODER*/ - -static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) -{ - /*the current bit in bitstream may be 0 or 1 for this to work*/ - if(bit == 0) bitstream[(*bitpointer) >> 3] &= (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7)))); - else bitstream[(*bitpointer) >> 3] |= (1 << (7 - ((*bitpointer) & 0x7))); - (*bitpointer)++; -} - -static unsigned LodePNG_read32bitInt(const unsigned char* buffer) -{ - return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; -} - -static void LodePNG_set32bitInt(unsigned char* buffer, unsigned value) /*buffer must have at least 4 allocated bytes available*/ -{ - buffer[0] = (unsigned char)((value >> 24) & 0xff); - buffer[1] = (unsigned char)((value >> 16) & 0xff); - buffer[2] = (unsigned char)((value >> 8) & 0xff); - buffer[3] = (unsigned char)((value ) & 0xff); -} - -#ifdef LODEPNG_COMPILE_ENCODER -static void LodePNG_add32bitInt(ucvector* buffer, unsigned value) -{ - ucvector_resize(buffer, buffer->size + 4); - LodePNG_set32bitInt(&buffer->data[buffer->size - 4], value); -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / PNG chunks / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -unsigned LodePNG_chunk_length(const unsigned char* chunk) /*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/ -{ - return LodePNG_read32bitInt(&chunk[0]); -} - -void LodePNG_chunk_type(char type[5], const unsigned char* chunk) /*puts the 4-byte type in null terminated string*/ -{ - unsigned i; - for(i = 0; i < 4; i++) type[i] = chunk[4 + i]; - type[4] = 0; /*null termination char*/ -} - -unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type) /*check if the type is the given type*/ -{ - if(strlen(type) != 4) return 0; - return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); -} - -/*properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard*/ -unsigned char LodePNG_chunk_critical(const unsigned char* chunk) /*0: ancillary chunk, 1: it's one of the critical chunk types*/ -{ - return((chunk[4] & 32) == 0); -} - -unsigned char LodePNG_chunk_private(const unsigned char* chunk) /*0: public, 1: private*/ -{ - return((chunk[6] & 32) != 0); -} - -unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk) /*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/ -{ - return((chunk[7] & 32) != 0); -} - -unsigned char* LodePNG_chunk_data(unsigned char* chunk) /*get pointer to the data of the chunk*/ -{ - return &chunk[8]; -} - -const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk) /*get pointer to the data of the chunk*/ -{ - return &chunk[8]; -} - -unsigned LodePNG_chunk_check_crc(const unsigned char* chunk) /*returns 0 if the crc is correct, error code if it's incorrect*/ -{ - unsigned length = LodePNG_chunk_length(chunk); - unsigned CRC = LodePNG_read32bitInt(&chunk[length + 8]); - unsigned checksum = Crc32_crc(&chunk[4], length + 4); /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ - if(CRC != checksum) return 1; - else return 0; -} - -void LodePNG_chunk_generate_crc(unsigned char* chunk) /*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ -{ - unsigned length = LodePNG_chunk_length(chunk); - unsigned CRC = Crc32_crc(&chunk[4], length + 4); - LodePNG_set32bitInt(chunk + 8 + length, CRC); -} - -unsigned char* LodePNG_chunk_next(unsigned char* chunk) /*don't use on IEND chunk, as there is no next chunk then*/ -{ - unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; - return &chunk[total_chunk_length]; -} - -const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk) /*don't use on IEND chunk, as there is no next chunk then*/ -{ - unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; - return &chunk[total_chunk_length]; -} - -unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk) /*appends chunk that was already created, to the data. Returns error code.*/ -{ - unsigned i; - unsigned total_chunk_length = LodePNG_chunk_length(chunk) + 12; - unsigned char *chunk_start, *new_buffer; - size_t new_length = (*outlength) + total_chunk_length; - if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/ - - new_buffer = (unsigned char*)realloc(*out, new_length); - if(!new_buffer) return 9929; - (*out) = new_buffer; - (*outlength) = new_length; - chunk_start = &(*out)[new_length - total_chunk_length]; - - for(i = 0; i < total_chunk_length; i++) chunk_start[i] = chunk[i]; - - return 0; -} - -unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data) /*appends new chunk to out. Returns error code; may change memory address of out buffer*/ -{ - unsigned i; - unsigned char *chunk, *new_buffer; - size_t new_length = (*outlength) + length + 12; - if(new_length < length + 12 || new_length < (*outlength)) return 77; /*integer overflow happened*/ - new_buffer = (unsigned char*)realloc(*out, new_length); - if(!new_buffer) return 9930; - (*out) = new_buffer; - (*outlength) = new_length; - chunk = &(*out)[(*outlength) - length - 12]; - - /*1: length*/ - LodePNG_set32bitInt(chunk, (unsigned)length); - - /*2: chunk name (4 letters)*/ - chunk[4] = type[0]; - chunk[5] = type[1]; - chunk[6] = type[2]; - chunk[7] = type[3]; - - /*3: the data*/ - for(i = 0; i < length; i++) chunk[8 + i] = data[i]; - - /*4: CRC (of the chunkname characters and the data)*/ - LodePNG_chunk_generate_crc(chunk); - - return 0; -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Color types and such / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*return type is a LodePNG error code*/ -static unsigned checkColorValidity(unsigned colorType, unsigned bd) /*bd = bitDepth*/ -{ - switch(colorType) - { - case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/ - case 2: if(!( bd == 8 || bd == 16)) return 37; break; /*RGB*/ - case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; /*palette*/ - case 4: if(!( bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/ - case 6: if(!( bd == 8 || bd == 16)) return 37; break; /*RGBA*/ - default: return 31; - } - return 0; /*allowed color type / bits combination*/ -} - -static unsigned getNumColorChannels(unsigned colorType) -{ - switch(colorType) - { - case 0: return 1; /*grey*/ - case 2: return 3; /*RGB*/ - case 3: return 1; /*palette*/ - case 4: return 2; /*grey + alpha*/ - case 6: return 4; /*RGBA*/ - } - return 0; /*unexisting color type*/ -} - -static unsigned getBpp(unsigned colorType, unsigned bitDepth) -{ - return getNumColorChannels(colorType) * bitDepth; /*bits per pixel is amount of channels * bits per channel*/ -} - -/* ////////////////////////////////////////////////////////////////////////// */ - -void LodePNG_InfoColor_init(LodePNG_InfoColor* info) -{ - info->key_defined = 0; - info->key_r = info->key_g = info->key_b = 0; - info->colorType = 6; - info->bitDepth = 8; - info->palette = 0; - info->palettesize = 0; -} - -void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info) -{ - LodePNG_InfoColor_clearPalette(info); -} - -void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info) -{ - if(info->palette) free(info->palette); - info->palettesize = 0; -} - -unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - unsigned char* data; - /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with the max of 256 colors, it'll have the exact alloc size*/ - if(!(info->palettesize & (info->palettesize - 1))) /*if palettesize is 0 or a power of two*/ - { - /*allocated data must be at least 4* palettesize (for 4 color bytes)*/ - size_t alloc_size = info->palettesize == 0 ? 4 : info->palettesize * 4 * 2; - data = (unsigned char*)realloc(info->palette, alloc_size); - if(!data) return 9931; - else info->palette = data; - } - info->palette[4 * info->palettesize + 0] = r; - info->palette[4 * info->palettesize + 1] = g; - info->palette[4 * info->palettesize + 2] = b; - info->palette[4 * info->palettesize + 3] = a; - info->palettesize++; - return 0; -} - -unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info) { return getBpp(info->colorType, info->bitDepth); } /*calculate bits per pixel out of colorType and bitDepth*/ -unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info) { return getNumColorChannels(info->colorType); } -unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info) { return info->colorType == 0 || info->colorType == 4; } -unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info) { return (info->colorType & 4) != 0; } - -unsigned LodePNG_InfoColor_equal(const LodePNG_InfoColor* info1, const LodePNG_InfoColor* info2) -{ - return info1->colorType == info2->colorType - && info1->bitDepth == info2->bitDepth; /*palette and color key not compared*/ -} - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - -void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks) -{ - unsigned i; - for(i = 0; i < 3; i++) chunks->data[i] = 0; - for(i = 0; i < 3; i++) chunks->datasize[i] = 0; -} - -void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks) -{ - unsigned i; - for(i = 0; i < 3; i++) free(chunks->data[i]); -} - -unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src) -{ - unsigned i; - - LodePNG_UnknownChunks_cleanup(dest); - - for(i = 0; i < 3; i++) - { - size_t j; - dest->datasize[i] = src->datasize[i]; - dest->data[i] = (unsigned char*)malloc(src->datasize[i]); - if(!dest->data[i] && dest->datasize[i]) return 9932; - for(j = 0; j < src->datasize[i]; j++) dest->data[i][j] = src->data[i][j]; - } - - return 0; -} - -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - -void LodePNG_Text_init(LodePNG_Text* text) -{ - text->num = 0; - text->keys = NULL; - text->strings = NULL; -} - -void LodePNG_Text_cleanup(LodePNG_Text* text) -{ - LodePNG_Text_clear(text); -} - -unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source) -{ - size_t i = 0; - dest->keys = 0; - dest->strings = 0; - dest->num = 0; - for(i = 0; i < source->num; i++) - { - unsigned error = LodePNG_Text_add(dest, source->keys[i], source->strings[i]); - if(error) return error; - } - return 0; -} - -void LodePNG_Text_clear(LodePNG_Text* text) -{ - size_t i; - for(i = 0; i < text->num; i++) - { - string_cleanup(&text->keys[i]); - string_cleanup(&text->strings[i]); - } - free(text->keys); - free(text->strings); -} - -unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str) -{ - char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1))); - char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1))); - if(!new_keys || !new_strings) - { - free(new_keys); - free(new_strings); - return 9933; - } - - text->num++; - text->keys = new_keys; - text->strings = new_strings; - - string_init(&text->keys[text->num - 1]); - string_set(&text->keys[text->num - 1], key); - - string_init(&text->strings[text->num - 1]); - string_set(&text->strings[text->num - 1], str); - - return 0; -} - -/******************************************************************************/ - -void LodePNG_IText_init(LodePNG_IText* text) -{ - text->num = 0; - text->keys = NULL; - text->langtags = NULL; - text->transkeys = NULL; - text->strings = NULL; -} - -void LodePNG_IText_cleanup(LodePNG_IText* text) -{ - LodePNG_IText_clear(text); -} - -unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source) -{ - size_t i = 0; - dest->keys = 0; - dest->langtags = 0; - dest->transkeys = 0; - dest->strings = 0; - dest->num = 0; - for(i = 0; i < source->num; i++) - { - unsigned error = LodePNG_IText_add(dest, source->keys[i], source->langtags[i], source->transkeys[i], source->strings[i]); - if(error) return error; - } - return 0; -} - -void LodePNG_IText_clear(LodePNG_IText* text) -{ - size_t i; - for(i = 0; i < text->num; i++) - { - string_cleanup(&text->keys[i]); - string_cleanup(&text->langtags[i]); - string_cleanup(&text->transkeys[i]); - string_cleanup(&text->strings[i]); - } - free(text->keys); - free(text->langtags); - free(text->transkeys); - free(text->strings); -} - -unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag, const char* transkey, const char* str) -{ - char** new_keys = (char**)(realloc(text->keys, sizeof(char*) * (text->num + 1))); - char** new_langtags = (char**)(realloc(text->langtags, sizeof(char*) * (text->num + 1))); - char** new_transkeys = (char**)(realloc(text->transkeys, sizeof(char*) * (text->num + 1))); - char** new_strings = (char**)(realloc(text->strings, sizeof(char*) * (text->num + 1))); - if(!new_keys || !new_langtags || !new_transkeys || !new_strings) - { - free(new_keys); - free(new_langtags); - free(new_transkeys); - free(new_strings); - return 9934; - } - - text->num++; - text->keys = new_keys; - text->langtags = new_langtags; - text->transkeys = new_transkeys; - text->strings = new_strings; - - string_init(&text->keys[text->num - 1]); - string_set(&text->keys[text->num - 1], key); - - string_init(&text->langtags[text->num - 1]); - string_set(&text->langtags[text->num - 1], langtag); - - string_init(&text->transkeys[text->num - 1]); - string_set(&text->transkeys[text->num - 1], transkey); - - string_init(&text->strings[text->num - 1]); - string_set(&text->strings[text->num - 1], str); - - return 0; -} - -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -void LodePNG_InfoPng_init(LodePNG_InfoPng* info) -{ - info->width = info->height = 0; - LodePNG_InfoColor_init(&info->color); - info->interlaceMethod = 0; - info->compressionMethod = 0; - info->filterMethod = 0; -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - info->background_defined = 0; - info->background_r = info->background_g = info->background_b = 0; - - LodePNG_Text_init(&info->text); - LodePNG_IText_init(&info->itext); - - info->time_defined = 0; - info->phys_defined = 0; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - LodePNG_UnknownChunks_init(&info->unknown_chunks); -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ -} - -void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info) -{ - LodePNG_InfoColor_cleanup(&info->color); -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - LodePNG_Text_cleanup(&info->text); - LodePNG_IText_cleanup(&info->itext); -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - LodePNG_UnknownChunks_cleanup(&info->unknown_chunks); -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ -} - -unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source) -{ - unsigned error = 0; - LodePNG_InfoPng_cleanup(dest); - *dest = *source; - LodePNG_InfoColor_init(&dest->color); - error = LodePNG_InfoColor_copy(&dest->color, &source->color); if(error) return error; - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - error = LodePNG_Text_copy(&dest->text, &source->text); if(error) return error; - error = LodePNG_IText_copy(&dest->itext, &source->itext); if(error) return error; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - LodePNG_UnknownChunks_init(&dest->unknown_chunks); - error = LodePNG_UnknownChunks_copy(&dest->unknown_chunks, &source->unknown_chunks); if(error) return error; -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - return error; -} - -void LodePNG_InfoPng_swap(LodePNG_InfoPng* a, LodePNG_InfoPng* b) -{ - LodePNG_InfoPng temp = *a; - *a = *b; - *b = temp; -} - -unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source) -{ - size_t i; - LodePNG_InfoColor_cleanup(dest); - *dest = *source; - dest->palette = (unsigned char*)malloc(source->palettesize * 4); - if(!dest->palette && source->palettesize) return 9935; - for(i = 0; i < source->palettesize * 4; i++) dest->palette[i] = source->palette[i]; - return 0; -} - -void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info) -{ - LodePNG_InfoColor_init(&info->color); -} - -void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info) -{ - LodePNG_InfoColor_cleanup(&info->color); -} - -unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source) -{ - unsigned error = 0; - LodePNG_InfoRaw_cleanup(dest); - *dest = *source; - LodePNG_InfoColor_init(&dest->color); - error = LodePNG_InfoColor_copy(&dest->color, &source->color); if(error) return error; - return error; -} - -/* ////////////////////////////////////////////////////////////////////////// */ - -/* -converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code -the out buffer must have (w * h * bpp + 7) / 8 bytes, where bpp is the bits per pixel of the output color type (LodePNG_InfoColor_getBpp) -for < 8 bpp images, there may _not_ be padding bits at the end of scanlines. -*/ -unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut, LodePNG_InfoColor* infoIn, unsigned w, unsigned h) -{ - const size_t numpixels = w * h; /*amount of pixels*/ - const unsigned OUT_BYTES = LodePNG_InfoColor_getBpp(infoOut) / 8; /*bytes per pixel in the output image*/ - const unsigned OUT_ALPHA = LodePNG_InfoColor_isAlphaType(infoOut); /*use 8-bit alpha channel*/ - size_t i, c, bp = 0; /*bitpointer, used by less-than-8-bit color types*/ - - /*cases where in and out already have the same format*/ - if(LodePNG_InfoColor_equal(infoIn, infoOut)) - { - size_t i, size = (w * h * LodePNG_InfoColor_getBpp(infoIn) + 7) / 8; - for(i = 0; i < size; i++) out[i] = in[i]; - return 0; - } - - if((infoOut->colorType == 2 || infoOut->colorType == 6) && infoOut->bitDepth == 8) - { - if(infoIn->bitDepth == 8) - { - switch(infoIn->colorType) - { - case 0: /*greyscale color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[i]; - if(OUT_ALPHA && infoIn->key_defined && in[i] == infoIn->key_r) out[OUT_BYTES * i + 3] = 0; - } - break; - case 2: /*RGB color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - for(c = 0; c < 3; c++) out[OUT_BYTES * i + c] = in[3 * i + c]; - if(OUT_ALPHA && infoIn->key_defined == 1 && in[3 * i + 0] == infoIn->key_r && in[3 * i + 1] == infoIn->key_g && in[3 * i + 2] == infoIn->key_b) out[OUT_BYTES * i + 3] = 0; - } - break; - case 3: /*indexed color (palette)*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - if(in[i] >= infoIn->palettesize) return 46; - for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = infoIn->palette[4 * in[i] + c]; /*get rgb colors from the palette*/ - } - break; - case 4: /*greyscale with alpha*/ - for(i = 0; i < numpixels; i++) - { - out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[2 * i + 0]; - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = in[2 * i + 1]; - } - break; - case 6: /*RGB with alpha*/ - for(i = 0; i < numpixels; i++) - { - for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = in[4 * i + c]; - } - break; - default: break; - } - } - else if(infoIn->bitDepth == 16) - { - switch(infoIn->colorType) - { - case 0: /*greyscale color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[2 * i]; - if(OUT_ALPHA && infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r) out[OUT_BYTES * i + 3] = 0; - } - break; - case 2: /*RGB color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - for(c = 0; c < 3; c++) out[OUT_BYTES * i + c] = in[6 * i + 2 * c]; - if(OUT_ALPHA && infoIn->key_defined && 256U * in[6 * i + 0] + in[6 * i + 1] == infoIn->key_r && 256U * in[6 * i + 2] + in[6 * i + 3] == infoIn->key_g && 256U * in[6 * i + 4] + in[6 * i + 5] == infoIn->key_b) out[OUT_BYTES * i + 3] = 0; - } - break; - case 4: /*greyscale with alpha*/ - for(i = 0; i < numpixels; i++) - { - out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = in[4 * i]; /*most significant byte*/ - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = in[4 * i + 2]; - } - break; - case 6: /*RGB with alpha*/ - for(i = 0; i < numpixels; i++) - { - for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = in[8 * i + 2 * c]; - } - break; - default: break; - } - } - else /*infoIn->bitDepth is less than 8 bit per channel*/ - { - switch(infoIn->colorType) - { - case 0: /*greyscale color*/ - for(i = 0; i < numpixels; i++) - { - unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - if(OUT_ALPHA && infoIn->key_defined && value && ((1U << infoIn->bitDepth) - 1U) == infoIn->key_r && ((1U << infoIn->bitDepth) - 1U)) out[OUT_BYTES * i + 3] = 0; - value = (value * 255) / ((1 << infoIn->bitDepth) - 1); /*scale value from 0 to 255*/ - out[OUT_BYTES * i + 0] = out[OUT_BYTES * i + 1] = out[OUT_BYTES * i + 2] = (unsigned char)(value); - } - break; - case 3: /*indexed color (palette)*/ - for(i = 0; i < numpixels; i++) - { - unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); - if(OUT_ALPHA) out[OUT_BYTES * i + 3] = 255; - if(value >= infoIn->palettesize) return 47; - for(c = 0; c < OUT_BYTES; c++) out[OUT_BYTES * i + c] = infoIn->palette[4 * value + c]; /*get rgb colors from the palette*/ - } - break; - default: break; - } - } - } - else if(LodePNG_InfoColor_isGreyscaleType(infoOut) && infoOut->bitDepth == 8) /*conversion from greyscale to greyscale*/ - { - if(!LodePNG_InfoColor_isGreyscaleType(infoIn)) return 62; - if(infoIn->bitDepth == 8) - { - switch(infoIn->colorType) - { - case 0: /*greyscale color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; - out[OUT_BYTES * i] = in[i]; - if(OUT_ALPHA && infoIn->key_defined && in[i] == infoIn->key_r) out[OUT_BYTES * i + 1] = 0; - } - break; - case 4: /*greyscale with alpha*/ - for(i = 0; i < numpixels; i++) - { - out[OUT_BYTES * i + 0] = in[2 * i + 0]; - if(OUT_ALPHA) out[OUT_BYTES * i + 1] = in[2 * i + 1]; - } - break; - default: return 31; - } - } - else if(infoIn->bitDepth == 16) - { - switch(infoIn->colorType) - { - case 0: /*greyscale color*/ - for(i = 0; i < numpixels; i++) - { - if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; - out[OUT_BYTES * i] = in[2 * i]; - if(OUT_ALPHA && infoIn->key_defined && 256U * in[i] + in[i + 1] == infoIn->key_r) out[OUT_BYTES * i + 1] = 0; - } - break; - case 4: /*greyscale with alpha*/ - for(i = 0; i < numpixels; i++) - { - out[OUT_BYTES * i] = in[4 * i]; /*most significant byte*/ - if(OUT_ALPHA) out[OUT_BYTES * i + 1] = in[4 * i + 2]; /*most significant byte*/ - } - break; - default: return 31; - } - } - else /*infoIn->bitDepth is less than 8 bit per channel*/ - { - if(infoIn->colorType != 0) return 31; /*colorType 0 is the only greyscale type with < 8 bits per channel*/ - for(i = 0; i < numpixels; i++) - { - unsigned value = readBitsFromReversedStream(&bp, in, infoIn->bitDepth); - if(OUT_ALPHA) out[OUT_BYTES * i + 1] = 255; - if(OUT_ALPHA && infoIn->key_defined && value && ((1U << infoIn->bitDepth) - 1U) == infoIn->key_r && ((1U << infoIn->bitDepth) - 1U)) out[OUT_BYTES * i + 1] = 0; - value = (value * 255) / ((1 << infoIn->bitDepth) - 1); /*scale value from 0 to 255*/ - out[OUT_BYTES * i] = (unsigned char)(value); - } - } - } - else return 59; - - return 0; -} - -/*Paeth predicter, used by PNG filter type 4*/ -static int paethPredictor(int a, int b, int c) -{ - int p = a + b - c; - int pa = p > a ? p - a : a - p; - int pb = p > b ? p - b : b - p; - int pc = p > c ? p - c : c - p; - - if(pa <= pb && pa <= pc) return a; - else if(pb <= pc) return b; - else return c; -} - -/*shared values used by multiple Adam7 related functions*/ - -static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/ -static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/ -static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/ -static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/ - -static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) -{ - /*the passstart values have 8 values: the 8th one actually indicates the byte after the end of the 7th (= last) pass*/ - unsigned i; - - /*calculate width and height in pixels of each pass*/ - for(i = 0; i < 7; i++) - { - passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; - passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; - if(passw[i] == 0) passh[i] = 0; - if(passh[i] == 0) passw[i] = 0; - } - - filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; - for(i = 0; i < 7; i++) - { - filter_passstart[i + 1] = filter_passstart[i] + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0); /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/ - padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8); /*bits padded if needed to fill full byte at end of each scanline*/ - passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8; /*only padded at end of reduced image*/ - } -} - -#ifdef LODEPNG_COMPILE_DECODER - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / PNG Decoder / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*read the information from the header and store it in the LodePNG_Info. return value is error*/ -void LodePNG_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t inlength) -{ - if(inlength == 0 || in == 0) { decoder->error = 48; return; } /*the given data is empty*/ - if(inlength < 29) { decoder->error = 27; return; } /*error: the data length is smaller than the length of the header*/ - - /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/ - LodePNG_InfoPng_cleanup(&decoder->infoPng); - LodePNG_InfoPng_init(&decoder->infoPng); - decoder->error = 0; - - if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { decoder->error = 28; return; } /*error: the first 8 bytes are not the correct PNG signature*/ - if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R') { decoder->error = 29; return; } /*error: it doesn't start with a IHDR chunk!*/ - - /*read the values given in the header*/ - decoder->infoPng.width = LodePNG_read32bitInt(&in[16]); - decoder->infoPng.height = LodePNG_read32bitInt(&in[20]); - decoder->infoPng.color.bitDepth = in[24]; - decoder->infoPng.color.colorType = in[25]; - decoder->infoPng.compressionMethod = in[26]; - decoder->infoPng.filterMethod = in[27]; - decoder->infoPng.interlaceMethod = in[28]; - - if(!decoder->settings.ignoreCrc) - { - unsigned CRC = LodePNG_read32bitInt(&in[29]); - unsigned checksum = Crc32_crc(&in[12], 17); - if(CRC != checksum) { decoder->error = 57; return; } - } - - if(decoder->infoPng.compressionMethod != 0) { decoder->error = 32; return; } /*error: only compression method 0 is allowed in the specification*/ - if(decoder->infoPng.filterMethod != 0) { decoder->error = 33; return; } /*error: only filter method 0 is allowed in the specification*/ - if(decoder->infoPng.interlaceMethod > 1) { decoder->error = 34; return; } /*error: only interlace methods 0 and 1 exist in the specification*/ - - decoder->error = checkColorValidity(decoder->infoPng.color.colorType, decoder->infoPng.color.bitDepth); -} - -static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, size_t bytewidth, unsigned char filterType, size_t length) -{ - /* - For PNG filter method 0 - unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, the filter works byte per byte (bytewidth = 1) - precon is the previous unfiltered scanline, recon the result, scanline the current one - the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead - recon and scanline MAY be the same memory address! precon must be disjoint. - */ - - size_t i; - switch(filterType) - { - case 0: - for(i = 0; i < length; i++) recon[i] = scanline[i]; - break; - case 1: - for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; - for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth]; - break; - case 2: - if(precon) for(i = 0; i < length; i++) recon[i] = scanline[i] + precon[i]; - else for(i = 0; i < length; i++) recon[i] = scanline[i]; - break; - case 3: - if(precon) - { - for(i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2; - for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2); - } - else - { - for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; - for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2; - } - break; - case 4: - if(precon) - { - for(i = 0; i < bytewidth; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(0, precon[i], 0)); - for(i = bytewidth; i < length; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth])); - } - else - { - for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; - for(i = bytewidth; i < length; i++) recon[i] = (unsigned char)(scanline[i] + paethPredictor(recon[i - bytewidth], 0, 0)); - } - break; - default: return 36; /*error: unexisting filter type given*/ - } - return 0; -} - -static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ - /* - For PNG filter method 0 - this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 it's called 7 times) - out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline - w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel - in and out are allowed to be the same memory address! - */ - - unsigned y; - unsigned char* prevline = 0; - - size_t bytewidth = (bpp + 7) / 8; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ - size_t linebytes = (w * bpp + 7) / 8; - - for(y = 0; y < h; y++) - { - size_t outindex = linebytes * y; - size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ - unsigned char filterType = in[inindex]; - - unsigned error = unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes); - if(error) return error; - - prevline = &out[outindex]; - } - - return 0; -} - -static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ - /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8 bit amounts, only between reduced images is padding - out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation (because that's likely a little bit faster)*/ - unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - if(bpp >= 8) - { - for(i = 0; i < 7; i++) - { - unsigned x, y, b; - size_t bytewidth = bpp / 8; - for(y = 0; y < passh[i]; y++) - for(x = 0; x < passw[i]; x++) - { - size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; - size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; - for(b = 0; b < bytewidth; b++) - { - out[pixeloutstart + b] = in[pixelinstart + b]; - } - } - } - } - else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ - { - for(i = 0; i < 7; i++) - { - unsigned x, y, b; - unsigned ilinebits = bpp * passw[i]; - unsigned olinebits = bpp * w; - size_t obp, ibp; /*bit pointers (for out and in buffer)*/ - for(y = 0; y < passh[i]; y++) - for(x = 0; x < passw[i]; x++) - { - ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); - obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; - for(b = 0; b < bpp; b++) - { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream0(&obp, out, bit); /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/ - } - } - } - } -} - -static void removePaddingBits(unsigned char* out, const unsigned char* in, size_t olinebits, size_t ilinebits, unsigned h) -{ - /* - After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers for the Adam7 code, the color convert code and the output to the user. - in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits - also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7 - only useful if (ilinebits - olinebits) is a value in the range 1..7 - */ - unsigned y; - size_t diff = ilinebits - olinebits; - size_t obp = 0, ibp = 0; /*bit pointers*/ - for(y = 0; y < h; y++) - { - size_t x; - for(x = 0; x < olinebits; x++) - { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream(&obp, out, bit); - } - ibp += diff; - } -} - -/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from the IDAT chunks*/ -static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, const LodePNG_InfoPng* infoPng) /*return value is error*/ -{ - /* - This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. Steps: - *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8) - *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace - NOTE: the in buffer will be overwritten with intermediate data! - */ - unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color); - unsigned w = infoPng->width; - unsigned h = infoPng->height; - unsigned error = 0; - if(bpp == 0) return 31; /*error: invalid colortype*/ - - if(infoPng->interlaceMethod == 0) - { - if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) - { - error = unfilter(in, in, w, h, bpp); - if(error) return error; - removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h); - } - else error = unfilter(out, in, w, h, bpp); /*we can immediatly filter into the out buffer, no other steps needed*/ - } - else /*interlaceMethod is 1 (Adam7)*/ - { - unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - for(i = 0; i < 7; i++) - { - error = unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp); - if(error) return error; - if(bpp < 8) /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, move bytes instead of bits or move not at all*/ - { - /*remove padding bits in scanlines; after this there still may be padding bits between the different reduced images: each reduced image still starts nicely at a byte*/ - removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, ((passw[i] * bpp + 7) / 8) * 8, passh[i]); - } - } - - Adam7_deinterlace(out, in, w, h, bpp); - } - - return error; -} - -/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/ -static void decodeGeneric(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t size) -{ - unsigned char IEND = 0; - const unsigned char* chunk; - size_t i; - ucvector idat; /*the data from idat chunks*/ - - /*for unknown chunk order*/ - unsigned unknown = 0; - unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/ - - /*provide some proper output values if error will happen*/ - *out = 0; - *outsize = 0; - - if(size == 0 || in == 0) { decoder->error = 48; return; } /*the given data is empty*/ - - LodePNG_inspect(decoder, in, size); /*reads header and resets other parameters in decoder->infoPng*/ - if(decoder->error) return; - - ucvector_init(&idat); - - chunk = &in[33]; /*first byte of the first chunk after the header*/ - - while(!IEND) /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is put at the start of the in buffer*/ - { - unsigned chunkLength; - const unsigned char* data; /*the data in the chunk*/ - - if((size_t)((chunk - in) + 12) > size || chunk < in) { decoder->error = 30; break; } /*error: size of the in buffer too small to contain next chunk*/ - chunkLength = LodePNG_chunk_length(chunk); /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/ - if(chunkLength > 2147483647) { decoder->error = 63; break; } - if((size_t)((chunk - in) + chunkLength + 12) > size || (chunk + chunkLength + 12) < in) { decoder->error = 35; break; } /*error: size of the in buffer too small to contain next chunk*/ - data = LodePNG_chunk_data_const(chunk); - - /*IDAT chunk, containing compressed image data*/ - if(LodePNG_chunk_type_equals(chunk, "IDAT")) - { - size_t oldsize = idat.size; - if(!ucvector_resize(&idat, oldsize + chunkLength)) { decoder->error = 9936; break; } - for(i = 0; i < chunkLength; i++) idat.data[oldsize + i] = data[i]; - critical_pos = 3; - } - /*IEND chunk*/ - else if(LodePNG_chunk_type_equals(chunk, "IEND")) - { - IEND = 1; - } - /*palette chunk (PLTE)*/ - else if(LodePNG_chunk_type_equals(chunk, "PLTE")) - { - unsigned pos = 0; - if(decoder->infoPng.color.palette) free(decoder->infoPng.color.palette); - decoder->infoPng.color.palettesize = chunkLength / 3; - decoder->infoPng.color.palette = (unsigned char*)malloc(4 * decoder->infoPng.color.palettesize); - if(!decoder->infoPng.color.palette && decoder->infoPng.color.palettesize) { decoder->error = 9937; break; } - if(!decoder->infoPng.color.palette) decoder->infoPng.color.palettesize = 0; /*malloc failed...*/ - if(decoder->infoPng.color.palettesize > 256) { decoder->error = 38; break; } /*error: palette too big*/ - for(i = 0; i < decoder->infoPng.color.palettesize; i++) - { - decoder->infoPng.color.palette[4 * i + 0] = data[pos++]; /*R*/ - decoder->infoPng.color.palette[4 * i + 1] = data[pos++]; /*G*/ - decoder->infoPng.color.palette[4 * i + 2] = data[pos++]; /*B*/ - decoder->infoPng.color.palette[4 * i + 3] = 255; /*alpha*/ - } - critical_pos = 2; - } - /*palette transparency chunk (tRNS)*/ - else if(LodePNG_chunk_type_equals(chunk, "tRNS")) - { - if(decoder->infoPng.color.colorType == 3) - { - if(chunkLength > decoder->infoPng.color.palettesize) { decoder->error = 39; break; } /*error: more alpha values given than there are palette entries*/ - for(i = 0; i < chunkLength; i++) decoder->infoPng.color.palette[4 * i + 3] = data[i]; - } - else if(decoder->infoPng.color.colorType == 0) - { - if(chunkLength != 2) { decoder->error = 40; break; } /*error: this chunk must be 2 bytes for greyscale image*/ - decoder->infoPng.color.key_defined = 1; - decoder->infoPng.color.key_r = decoder->infoPng.color.key_g = decoder->infoPng.color.key_b = 256 * data[0] + data[1]; - } - else if(decoder->infoPng.color.colorType == 2) - { - if(chunkLength != 6) { decoder->error = 41; break; } /*error: this chunk must be 6 bytes for RGB image*/ - decoder->infoPng.color.key_defined = 1; - decoder->infoPng.color.key_r = 256 * data[0] + data[1]; - decoder->infoPng.color.key_g = 256 * data[2] + data[3]; - decoder->infoPng.color.key_b = 256 * data[4] + data[5]; - } - else { decoder->error = 42; break; } /*error: tRNS chunk not allowed for other color models*/ - } -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /*background color chunk (bKGD)*/ - else if(LodePNG_chunk_type_equals(chunk, "bKGD")) - { - if(decoder->infoPng.color.colorType == 3) - { - if(chunkLength != 1) { decoder->error = 43; break; } /*error: this chunk must be 1 byte for indexed color image*/ - decoder->infoPng.background_defined = 1; - decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_g = data[0]; - } - else if(decoder->infoPng.color.colorType == 0 || decoder->infoPng.color.colorType == 4) - { - if(chunkLength != 2) { decoder->error = 44; break; } /*error: this chunk must be 2 bytes for greyscale image*/ - decoder->infoPng.background_defined = 1; - decoder->infoPng.background_r = decoder->infoPng.background_g = decoder->infoPng.background_b = 256 * data[0] + data[1]; - } - else if(decoder->infoPng.color.colorType == 2 || decoder->infoPng.color.colorType == 6) - { - if(chunkLength != 6) { decoder->error = 45; break; } /*error: this chunk must be 6 bytes for greyscale image*/ - decoder->infoPng.background_defined = 1; - decoder->infoPng.background_r = 256 * data[0] + data[1]; - decoder->infoPng.background_g = 256 * data[2] + data[3]; - decoder->infoPng.background_b = 256 * data[4] + data[5]; - } - } - /*text chunk (tEXt)*/ - else if(LodePNG_chunk_type_equals(chunk, "tEXt")) - { - if(decoder->settings.readTextChunks) - { - char *key = 0, *str = 0; - - while(!decoder->error) /*not really a while loop, only used to break on error*/ - { - unsigned length, string2_begin; - - for(length = 0; length < chunkLength && data[length] != 0; length++) ; - if(length + 1 >= chunkLength) { decoder->error = 75; break; } - key = (char*)malloc(length + 1); - if(!key) { decoder->error = 9938; break; } - key[length] = 0; - for(i = 0; i < length; i++) key[i] = data[i]; - - string2_begin = length + 1; - if(string2_begin > chunkLength) { decoder->error = 75; break; } - length = chunkLength - string2_begin; - str = (char*)malloc(length + 1); - if(!str) { decoder->error = 9939; break; } - str[length] = 0; - for(i = 0; i < length; i++) str[i] = data[string2_begin + i]; - - decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, str); - - break; - } - - free(key); - free(str); - } - } - /*compressed text chunk (zTXt)*/ - else if(LodePNG_chunk_type_equals(chunk, "zTXt")) - { - if(decoder->settings.readTextChunks) - { - unsigned length, string2_begin; - char *key = 0; - ucvector decoded; - - ucvector_init(&decoded); - - while(!decoder->error) /*not really a while loop, only used to break on error*/ - { - for(length = 0; length < chunkLength && data[length] != 0; length++) ; - if(length + 2 >= chunkLength) { decoder->error = 75; break; } - key = (char*)malloc(length + 1); - if(!key) { decoder->error = 9940; break; } - key[length] = 0; - for(i = 0; i < length; i++) key[i] = data[i]; - - if(data[length + 1] != 0) { decoder->error = 72; break; } /*the 0 byte indicating compression must be 0*/ - - string2_begin = length + 2; - if(string2_begin > chunkLength) { decoder->error = 75; break; } - length = chunkLength - string2_begin; - decoder->error = LodePNG_decompress(&decoded.data, &decoded.size, (unsigned char*)(&data[string2_begin]), length, &decoder->settings.zlibsettings); - if(decoder->error) break; - ucvector_push_back(&decoded, 0); - - decoder->error = LodePNG_Text_add(&decoder->infoPng.text, key, (char*)decoded.data); - - break; - } - - free(key); - ucvector_cleanup(&decoded); - if(decoder->error) break; - } - } - /*international text chunk (iTXt)*/ - else if(LodePNG_chunk_type_equals(chunk, "iTXt")) - { - if(decoder->settings.readTextChunks) - { - unsigned length, begin, compressed; - char *key = 0, *langtag = 0, *transkey = 0; - ucvector decoded; - ucvector_init(&decoded); - - while(!decoder->error) /*not really a while loop, only used to break on error*/ - { - if(chunkLength < 5) { decoder->error = 76; break; } - for(length = 0; length < chunkLength && data[length] != 0; length++) ; - if(length + 2 >= chunkLength) { decoder->error = 75; break; } - key = (char*)malloc(length + 1); - if(!key) { decoder->error = 9941; break; } - key[length] = 0; - for(i = 0; i < length; i++) key[i] = data[i]; - - compressed = data[length + 1]; - if(data[length + 2] != 0) { decoder->error = 72; break; } /*the 0 byte indicating compression must be 0*/ - - begin = length + 3; - length = 0; - for(i = begin; i < chunkLength && data[i] != 0; i++) length++; - if(begin + length + 1 >= chunkLength) { decoder->error = 75; break; } - langtag = (char*)malloc(length + 1); - if(!langtag) { decoder->error = 9942; break; } - langtag[length] = 0; - for(i = 0; i < length; i++) langtag[i] = data[begin + i]; - - begin += length + 1; - length = 0; - for(i = begin; i < chunkLength && data[i] != 0; i++) length++; - if(begin + length + 1 >= chunkLength) { decoder->error = 75; break; } - transkey = (char*)malloc(length + 1); - if(!transkey) { decoder->error = 9943; break; } - transkey[length] = 0; - for(i = 0; i < length; i++) transkey[i] = data[begin + i]; - - begin += length + 1; - if(begin > chunkLength) { decoder->error = 75; break; } - length = chunkLength - begin; - - if(compressed) - { - decoder->error = LodePNG_decompress(&decoded.data, &decoded.size, (unsigned char*)(&data[begin]), length, &decoder->settings.zlibsettings); - if(decoder->error) break; - ucvector_push_back(&decoded, 0); - } - else - { - if(!ucvector_resize(&decoded, length + 1)) { decoder->error = 9944; break; } - decoded.data[length] = 0; - for(i = 0; i < length; i++) decoded.data[i] = data[begin + i]; - } - - decoder->error = LodePNG_IText_add(&decoder->infoPng.itext, key, langtag, transkey, (char*)decoded.data); - - break; - } - - free(key); - free(langtag); - free(transkey); - ucvector_cleanup(&decoded); - if(decoder->error) break; - } - } - else if(LodePNG_chunk_type_equals(chunk, "tIME")) - { - if(chunkLength != 7) { decoder->error = 73; break; } - decoder->infoPng.time_defined = 1; - decoder->infoPng.time.year = 256 * data[0] + data[+ 1]; - decoder->infoPng.time.month = data[2]; - decoder->infoPng.time.day = data[3]; - decoder->infoPng.time.hour = data[4]; - decoder->infoPng.time.minute = data[5]; - decoder->infoPng.time.second = data[6]; - } - else if(LodePNG_chunk_type_equals(chunk, "pHYs")) - { - if(chunkLength != 9) { decoder->error = 74; break; } - decoder->infoPng.phys_defined = 1; - decoder->infoPng.phys_x = 16777216 * data[0] + 65536 * data[1] + 256 * data[2] + data[3]; - decoder->infoPng.phys_y = 16777216 * data[4] + 65536 * data[5] + 256 * data[6] + data[7]; - decoder->infoPng.phys_unit = data[8]; - } -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - else /*it's not an implemented chunk type, so ignore it: skip over the data*/ - { - if(LodePNG_chunk_critical(chunk)) { decoder->error = 69; break; } /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ - unknown = 1; -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - if(decoder->settings.rememberUnknownChunks) - { - LodePNG_UnknownChunks* unknown = &decoder->infoPng.unknown_chunks; - decoder->error = LodePNG_append_chunk(&unknown->data[critical_pos - 1], &unknown->datasize[critical_pos - 1], chunk); - if(decoder->error) break; - } -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - } - - if(!decoder->settings.ignoreCrc && !unknown) /*check CRC if wanted, only on known chunk types*/ - { - if(LodePNG_chunk_check_crc(chunk)) { decoder->error = 57; break; } - } - - if(!IEND) chunk = LodePNG_chunk_next_const(chunk); - } - - if(!decoder->error) - { - ucvector scanlines; - ucvector_init(&scanlines); - if(!ucvector_resize(&scanlines, ((decoder->infoPng.width * (decoder->infoPng.height * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7)) / 8) + decoder->infoPng.height)) decoder->error = 9945; /*maximum final image length is already reserved in the vector's length - this is not really necessary*/ - if(!decoder->error) decoder->error = LodePNG_decompress(&scanlines.data, &scanlines.size, idat.data, idat.size, &decoder->settings.zlibsettings); /*decompress with the Zlib decompressor*/ - - if(!decoder->error) - { - ucvector outv; - ucvector_init(&outv); - if(!ucvector_resizev(&outv, (decoder->infoPng.height * decoder->infoPng.width * LodePNG_InfoColor_getBpp(&decoder->infoPng.color) + 7) / 8, 0)) decoder->error = 9946; - if(!decoder->error) decoder->error = postProcessScanlines(outv.data, scanlines.data, &decoder->infoPng); - *out = outv.data; - *outsize = outv.size; - } - ucvector_cleanup(&scanlines); - } - - ucvector_cleanup(&idat); -} - -void LodePNG_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize) -{ - *out = 0; - *outsize = 0; - decodeGeneric(decoder, out, outsize, in, insize); - if(decoder->error) return; - if(!decoder->settings.color_convert || LodePNG_InfoColor_equal(&decoder->infoRaw.color, &decoder->infoPng.color)) - { - /*same color type, no copying or converting of data needed*/ - /*store the infoPng color settings on the infoRaw so that the infoRaw still reflects what colorType - the raw image has to the end user*/ - if(!decoder->settings.color_convert) - { - decoder->error = LodePNG_InfoColor_copy(&decoder->infoRaw.color, &decoder->infoPng.color); - if(decoder->error) return; - } - } - else - { - /*color conversion needed; sort of copy of the data*/ - unsigned char* data = *out; - - /*TODO: check if this works according to the statement in the documentation: "The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/ - if(!(decoder->infoRaw.color.colorType == 2 || decoder->infoRaw.color.colorType == 6) && !(decoder->infoRaw.color.bitDepth == 8)) { decoder->error = 56; return; } - - *outsize = (decoder->infoPng.width * decoder->infoPng.height * LodePNG_InfoColor_getBpp(&decoder->infoRaw.color) + 7) / 8; - *out = (unsigned char*)malloc(*outsize); - if(!(*out)) - { - decoder->error = 9947; - *outsize = 0; - } - else decoder->error = LodePNG_convert(*out, data, &decoder->infoRaw.color, &decoder->infoPng.color, decoder->infoPng.width, decoder->infoPng.height); - free(data); - } -} - -unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) -{ - unsigned error; - size_t dummy_size; - LodePNG_Decoder decoder; - LodePNG_Decoder_init(&decoder); - LodePNG_decode(&decoder, out, &dummy_size, in, insize); - error = decoder.error; - *w = decoder.infoPng.width; - *h = decoder.infoPng.height; - LodePNG_Decoder_cleanup(&decoder); - return error; -} - -#ifdef LODEPNG_COMPILE_DISK -unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename) -{ - unsigned char* buffer; - size_t buffersize; - unsigned error; - error = LodePNG_loadFile(&buffer, &buffersize, filename); - if(!error) error = LodePNG_decode32(out, w, h, buffer, buffersize); - free(buffer); - return error; -} -#endif /*LODEPNG_COMPILE_DISK*/ - -void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings) -{ - settings->color_convert = 1; -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - settings->readTextChunks = 1; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - settings->ignoreCrc = 0; -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - settings->rememberUnknownChunks = 0; -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - LodeZlib_DecompressSettings_init(&settings->zlibsettings); -} - -void LodePNG_Decoder_init(LodePNG_Decoder* decoder) -{ - LodePNG_DecodeSettings_init(&decoder->settings); - LodePNG_InfoRaw_init(&decoder->infoRaw); - LodePNG_InfoPng_init(&decoder->infoPng); - decoder->error = 1; -} - -void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder) -{ - LodePNG_InfoRaw_cleanup(&decoder->infoRaw); - LodePNG_InfoPng_cleanup(&decoder->infoPng); -} - -void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source) -{ - LodePNG_Decoder_cleanup(dest); - *dest = *source; - LodePNG_InfoRaw_init(&dest->infoRaw); - LodePNG_InfoPng_init(&dest->infoPng); - dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw); if(dest->error) return; - dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng); if(dest->error) return; -} - -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / PNG Encoder / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*chunkName must be string of 4 characters*/ -static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length) -{ - unsigned error = LodePNG_create_chunk(&out->data, &out->size, (unsigned)length, chunkName, data); - if(error) return error; - out->allocsize = out->size; /*fix the allocsize again*/ - return 0; -} - -static void writeSignature(ucvector* out) -{ - /*8 bytes PNG signature*/ - ucvector_push_back(out, 137); - ucvector_push_back(out, 80); - ucvector_push_back(out, 78); - ucvector_push_back(out, 71); - ucvector_push_back(out, 13); - ucvector_push_back(out, 10); - ucvector_push_back(out, 26); - ucvector_push_back(out, 10); -} - -static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, unsigned bitDepth, unsigned colorType, unsigned interlaceMethod) -{ - unsigned error = 0; - ucvector header; - ucvector_init(&header); - - LodePNG_add32bitInt(&header, w); /*width*/ - LodePNG_add32bitInt(&header, h); /*height*/ - ucvector_push_back(&header, (unsigned char)bitDepth); /*bit depth*/ - ucvector_push_back(&header, (unsigned char)colorType); /*color type*/ - ucvector_push_back(&header, 0); /*compression method*/ - ucvector_push_back(&header, 0); /*filter method*/ - ucvector_push_back(&header, interlaceMethod); /*interlace method*/ - - error = addChunk(out, "IHDR", header.data, header.size); - ucvector_cleanup(&header); - - return error; -} - -static unsigned addChunk_PLTE(ucvector* out, const LodePNG_InfoColor* info) -{ - unsigned error = 0; - size_t i; - ucvector PLTE; - ucvector_init(&PLTE); - for(i = 0; i < info->palettesize * 4; i++) if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]); /*add all channels except alpha channel*/ - error = addChunk(out, "PLTE", PLTE.data, PLTE.size); - ucvector_cleanup(&PLTE); - - return error; -} - -static unsigned addChunk_tRNS(ucvector* out, const LodePNG_InfoColor* info) -{ - unsigned error = 0; - size_t i; - ucvector tRNS; - ucvector_init(&tRNS); - if(info->colorType == 3) - { - for(i = 0; i < info->palettesize; i++) ucvector_push_back(&tRNS, info->palette[4 * i + 3]); /*add only alpha channel*/ - } - else if(info->colorType == 0) - { - if(info->key_defined) - { - ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); - } - } - else if(info->colorType == 2) - { - if(info->key_defined) - { - ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_g / 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_g % 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_b / 256)); - ucvector_push_back(&tRNS, (unsigned char)(info->key_b % 256)); - } - } - - error = addChunk(out, "tRNS", tRNS.data, tRNS.size); - ucvector_cleanup(&tRNS); - - return error; -} - -static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize, LodeZlib_DeflateSettings* zlibsettings) -{ - ucvector zlibdata; - unsigned error = 0; - - /*compress with the Zlib compressor*/ - ucvector_init(&zlibdata); - error = LodePNG_compress(&zlibdata.data, &zlibdata.size, data, datasize, zlibsettings); - if(!error) error = addChunk(out, "IDAT", zlibdata.data, zlibdata.size); - ucvector_cleanup(&zlibdata); - - return error; -} - -static unsigned addChunk_IEND(ucvector* out) -{ - unsigned error = 0; - error = addChunk(out, "IEND", 0, 0); - return error; -} - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - -static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) /*add text chunk*/ -{ - unsigned error = 0; - size_t i; - ucvector text; - ucvector_init(&text); - for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&text, (unsigned char)keyword[i]); - ucvector_push_back(&text, 0); - for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&text, (unsigned char)textstring[i]); - error = addChunk(out, "tEXt", text.data, text.size); - ucvector_cleanup(&text); - - return error; -} - -static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring, LodeZlib_DeflateSettings* zlibsettings) -{ - unsigned error = 0; - ucvector data, compressed; - size_t i, textsize = strlen(textstring); - - ucvector_init(&data); - ucvector_init(&compressed); - for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); - ucvector_push_back(&data, 0); /* 0 termination char*/ - ucvector_push_back(&data, 0); /*compression method: 0*/ - - error = LodePNG_compress(&compressed.data, &compressed.size, (unsigned char*)textstring, textsize, zlibsettings); - if(!error) - { - for(i = 0; i < compressed.size; i++) ucvector_push_back(&data, compressed.data[i]); - error = addChunk(out, "zTXt", data.data, data.size); - } - - ucvector_cleanup(&compressed); - ucvector_cleanup(&data); - return error; -} - -static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag, const char* transkey, const char* textstring, LodeZlib_DeflateSettings* zlibsettings) -{ - unsigned error = 0; - ucvector data, compressed_data; - size_t i, textsize = strlen(textstring); - - ucvector_init(&data); - - for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); - ucvector_push_back(&data, 0); /*null termination char*/ - ucvector_push_back(&data, compressed ? 1 : 0); /*compression flag*/ - ucvector_push_back(&data, 0); /*compression method*/ - for(i = 0; langtag[i] != 0; i++) ucvector_push_back(&data, (unsigned char)langtag[i]); - ucvector_push_back(&data, 0); /*null termination char*/ - for(i = 0; transkey[i] != 0; i++) ucvector_push_back(&data, (unsigned char)transkey[i]); - ucvector_push_back(&data, 0); /*null termination char*/ - - if(compressed) - { - ucvector_init(&compressed_data); - error = LodePNG_compress(&compressed_data.data, &compressed_data.size, (unsigned char*)textstring, textsize, zlibsettings); - if(!error) - { - for(i = 0; i < compressed_data.size; i++) ucvector_push_back(&data, compressed_data.data[i]); - for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]); - } - } - else /*not compressed*/ - { - for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]); - } - - if(!error) error = addChunk(out, "iTXt", data.data, data.size); - ucvector_cleanup(&data); - return error; -} - -static unsigned addChunk_bKGD(ucvector* out, const LodePNG_InfoPng* info) -{ - unsigned error = 0; - ucvector bKGD; - ucvector_init(&bKGD); - if(info->color.colorType == 0 || info->color.colorType == 4) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); - } - else if(info->color.colorType == 2 || info->color.colorType == 6) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_g / 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_g % 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_b / 256)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_b % 256)); - } - else if(info->color.colorType == 3) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); /*palette index*/ - } - - error = addChunk(out, "bKGD", bKGD.data, bKGD.size); - ucvector_cleanup(&bKGD); - - return error; -} - -static unsigned addChunk_tIME(ucvector* out, const LodePNG_Time* time) -{ - unsigned error = 0; - unsigned char* data = (unsigned char*)malloc(7); - if(!data) return 9948; - data[0] = (unsigned char)(time->year / 256); - data[1] = (unsigned char)(time->year % 256); - data[2] = time->month; - data[3] = time->day; - data[4] = time->hour; - data[5] = time->minute; - data[6] = time->second; - error = addChunk(out, "tIME", data, 7); - free(data); - return error; -} - -static unsigned addChunk_pHYs(ucvector* out, const LodePNG_InfoPng* info) -{ - unsigned error = 0; - ucvector data; - ucvector_init(&data); - - LodePNG_add32bitInt(&data, info->phys_x); - LodePNG_add32bitInt(&data, info->phys_y); - ucvector_push_back(&data, info->phys_unit); - - error = addChunk(out, "pHYs", data.data, data.size); - ucvector_cleanup(&data); - - return error; -} - -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline, size_t length, size_t bytewidth, unsigned char filterType) -{ - size_t i; - switch(filterType) - { - case 0: - if(prevline) for(i = 0; i < length; i++) out[i] = scanline[i]; - else for(i = 0; i < length; i++) out[i] = scanline[i]; - break; - case 1: - if(prevline) - { - for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; - for(i = bytewidth; i < length ; i++) out[i] = scanline[i] - scanline[i - bytewidth]; - } - else - { - for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; - for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth]; - } - break; - case 2: - if(prevline) for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i]; - else for(i = 0; i < length; i++) out[i] = scanline[i]; - break; - case 3: - if(prevline) - { - for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2; - for(i = bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2); - } - else - { - for(i = 0; i < length; i++) out[i] = scanline[i]; - for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth] / 2; - } - break; - case 4: - if(prevline) - { - for(i = 0; i < bytewidth; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(0, prevline[i], 0)); - for(i = bytewidth; i < length; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth])); - } - else - { - for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; - for(i = bytewidth; i < length; i++) out[i] = (unsigned char)(scanline[i] - paethPredictor(scanline[i - bytewidth], 0, 0)); - } - break; - default: return; /*unexisting filter type given*/ - } -} - -static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, const LodePNG_InfoColor* info) -{ - /* - For PNG filter method 0 - out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are the scanlines with 1 extra byte per scanline - - There is a nice heuristic described here: http://www.cs.toronto.edu/~cosmin/pngtech/optipng.html. It says: - * If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e. use fixed filtering, with the filter None). - * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply all five filters and select the filter that produces the smallest sum of absolute values per row. - - Here the above method is used mostly. Note though that it appears to be better to use the adaptive filtering on the plasma 8-bit palette example, but that image isn't the best reference for palette images in general. - */ - - unsigned bpp = LodePNG_InfoColor_getBpp(info); - size_t linebytes = (w * bpp + 7) / 8; /*the width of a scanline in bytes, not including the filter type*/ - size_t bytewidth = (bpp + 7) / 8; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ - const unsigned char* prevline = 0; - unsigned x, y; - unsigned heuristic; - unsigned error = 0; - - if(bpp == 0) return 31; /*invalid color type*/ - - /*choose heuristic as described above*/ - if(info->colorType == 3 || info->bitDepth < 8) heuristic = 0; - else heuristic = 1; - - if(heuristic == 0) /*None filtertype for everything*/ - { - for(y = 0; y < h; y++) - { - size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ - size_t inindex = linebytes * y; - const unsigned TYPE = 0; - out[outindex] = TYPE; /*filter type byte*/ - filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, TYPE); - prevline = &in[inindex]; - } - } - else if(heuristic == 1) /*adaptive filtering*/ - { - size_t sum[5]; - ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ - size_t smallest = 0; - unsigned type, bestType = 0; - - for(type = 0; type < 5; type++) ucvector_init(&attempt[type]); - for(type = 0; type < 5; type++) - { - if(!ucvector_resize(&attempt[type], linebytes)) { error = 9949; break; } - } - - if(!error) - { - for(y = 0; y < h; y++) - { - /*try the 5 filter types*/ - for(type = 0; type < 5; type++) - { - filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); - - /*calculate the sum of the result*/ - sum[type] = 0; - for(x = 0; x < attempt[type].size; x+=3) sum[type] += attempt[type].data[x]; /*note that not all pixels are checked to speed this up while still having probably the best choice*/ - - /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ - if(type == 0 || sum[type] < smallest) - { - bestType = type; - smallest = sum[type]; - } - } - - prevline = &in[y * linebytes]; - - /*now fill the out values*/ - out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ - for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; - } - } - - for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); - } - #if 0 /*deflate the scanline with a fixed tree after every filter attempt to see which one deflates best. This is slow, and _does not work as expected_: the heuristic gives smaller result!*/ - else if(heuristic == 2) /*adaptive filtering by using deflate*/ - { - size_t size[5]; - ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ - size_t smallest; - unsigned type = 0, bestType = 0; - unsigned char* dummy; - LodeZlib_DeflateSettings deflatesettings = LodeZlib_defaultDeflateSettings; - deflatesettings.btype = 1; /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose, to simulate the true case where the tree is the same for the whole image*/ - for(type = 0; type < 5; type++) { ucvector_init(&attempt[type]); ucvector_resize(&attempt[type], linebytes); } - for(y = 0; y < h; y++) /*try the 5 filter types*/ - { - for(type = 0; type < 5; type++) - { - filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); - size[type] = 0; dummy = 0; - LodePNG_compress(&dummy, &size[type], attempt[type].data, attempt[type].size, &deflatesettings); - free(dummy); - /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/ - if(type == 0 || size[type] < smallest) { bestType = type; smallest = size[type]; } - } - prevline = &in[y * linebytes]; - out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ - for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; - } - for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); - } - #endif - - return error; -} - -static void addPaddingBits(unsigned char* out, const unsigned char* in, size_t olinebits, size_t ilinebits, unsigned h) -{ - /*The opposite of the removePaddingBits function - olinebits must be >= ilinebits*/ - unsigned y; - size_t diff = olinebits - ilinebits; - size_t obp = 0, ibp = 0; /*bit pointers*/ - for(y = 0; y < h; y++) - { - size_t x; - for(x = 0; x < ilinebits; x++) - { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream(&obp, out, bit); - } - /*obp += diff; --> no, fill in some value in the padding bits too, to avoid "Use of uninitialised value of size ###" warning from valgrind*/ - for(x = 0; x < diff; x++) setBitOfReversedStream(&obp, out, 0); - } -} - -static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ - /*Note: this function works on image buffers WITHOUT padding bits at end of scanlines with non-multiple-of-8 bit amounts, only between reduced images is padding*/ - unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - if(bpp >= 8) - { - for(i = 0; i < 7; i++) - { - unsigned x, y, b; - size_t bytewidth = bpp / 8; - for(y = 0; y < passh[i]; y++) - for(x = 0; x < passw[i]; x++) - { - size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; - size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth; - for(b = 0; b < bytewidth; b++) - { - out[pixeloutstart + b] = in[pixelinstart + b]; - } - } - } - } - else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ - { - for(i = 0; i < 7; i++) - { - unsigned x, y, b; - unsigned ilinebits = bpp * passw[i]; - unsigned olinebits = bpp * w; - size_t obp, ibp; /*bit pointers (for out and in buffer)*/ - for(y = 0; y < passh[i]; y++) - for(x = 0; x < passw[i]; x++) - { - ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; - obp = (8 * passstart[i]) + (y * ilinebits + x * bpp); - for(b = 0; b < bpp; b++) - { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream(&obp, out, bit); - } - } - } - } -} - -/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image*/ -static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in, const LodePNG_InfoPng* infoPng) /*return value is error*/ -{ - /* - This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps: - *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter - *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter - */ - unsigned bpp = LodePNG_InfoColor_getBpp(&infoPng->color); - unsigned w = infoPng->width; - unsigned h = infoPng->height; - unsigned error = 0; - - if(infoPng->interlaceMethod == 0) - { - *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/ - *out = (unsigned char*)malloc(*outsize); - if(!(*out) && (*outsize)) error = 9950; - - if(!error) - { - if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) /*non multiple of 8 bits per scanline, padding bits needed per scanline*/ - { - ucvector padded; - ucvector_init(&padded); - if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9951; - if(!error) - { - addPaddingBits(padded.data, in, ((w * bpp + 7) / 8) * 8, w * bpp, h); - error = filter(*out, padded.data, w, h, &infoPng->color); - } - ucvector_cleanup(&padded); - } - else error = filter(*out, in, w, h, &infoPng->color); /*we can immediatly filter into the out buffer, no other steps needed*/ - } - } - else /*interlaceMethod is 1 (Adam7)*/ - { - unsigned char* adam7 = (unsigned char*)malloc((h * w * bpp + 7) / 8); - if(!adam7 && ((h * w * bpp + 7) / 8)) error = 9952; /*malloc failed*/ - - while(!error) /*not a real while loop, used to break out to cleanup to avoid a goto*/ - { - unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/ - *out = (unsigned char*)malloc(*outsize); - if(!(*out) && (*outsize)) { error = 9953; break; } - - Adam7_interlace(adam7, in, w, h, bpp); - - for(i = 0; i < 7; i++) - { - if(bpp < 8) - { - ucvector padded; - ucvector_init(&padded); - if(!ucvector_resize(&padded, h * ((w * bpp + 7) / 8))) error = 9954; - if(!error) - { - addPaddingBits(&padded.data[padded_passstart[i]], &adam7[passstart[i]], ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]); - error = filter(&(*out)[filter_passstart[i]], &padded.data[padded_passstart[i]], passw[i], passh[i], &infoPng->color); - } - - ucvector_cleanup(&padded); - } - else - { - error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]], passw[i], passh[i], &infoPng->color); - } - } - - break; - } - - free(adam7); - } - - return error; -} - -/*palette must have 4 * palettesize bytes allocated*/ -static unsigned isPaletteFullyOpaque(const unsigned char* palette, size_t palettesize) /*palette given in format RGBARGBARGBARGBA...*/ -{ - size_t i; - for(i = 0; i < palettesize; i++) - { - if(palette[4 * i + 3] != 255) return 0; - } - return 1; -} - -/*this function checks if the input image given by the user has no transparent pixels*/ -static unsigned isFullyOpaque(const unsigned char* image, unsigned w, unsigned h, const LodePNG_InfoColor* info) -{ - /*TODO: When the user specified a color key for the input image, then this function must also check for pixels that are the same as the color key and treat those as transparent.*/ - - unsigned i, numpixels = w * h; - if(info->colorType == 6) - { - if(info->bitDepth == 8) - { - for(i = 0; i < numpixels; i++) if(image[i * 4 + 3] != 255) return 0; - } - else - { - for(i = 0; i < numpixels; i++) if(image[i * 8 + 6] != 255 || image[i * 8 + 7] != 255) return 0; - } - return 1; /*no single pixel with alpha channel other than 255 found*/ - } - else if(info->colorType == 4) - { - if(info->bitDepth == 8) - { - for(i = 0; i < numpixels; i++) if(image[i * 2 + 1] != 255) return 0; - } - else - { - for(i = 0; i < numpixels; i++) if(image[i * 4 + 2] != 255 || image[i * 4 + 3] != 255) return 0; - } - return 1; /*no single pixel with alpha channel other than 255 found*/ - } - else if(info->colorType == 3) - { - /*when there's a palette, we could check every pixel for translucency, but much quicker is to just check the palette*/ - return(isPaletteFullyOpaque(info->palette, info->palettesize)); - } - - return 0; /*color type that isn't supported by this function yet, so assume there is transparency to be safe*/ -} - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS -static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) -{ - unsigned char* inchunk = data; - while((size_t)(inchunk - data) < datasize) - { - unsigned error = LodePNG_append_chunk(&out->data, &out->size, inchunk); - if(error) return error; /*error: not enough memory*/ - out->allocsize = out->size; /*fix the allocsize again*/ - inchunk = LodePNG_chunk_next(inchunk); - } - return 0; -} -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - -void LodePNG_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) -{ - LodePNG_InfoPng info; - ucvector outv; - unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/ - size_t datasize = 0; - - /*provide some proper output values if error will happen*/ - *out = 0; - *outsize = 0; - encoder->error = 0; - - info = encoder->infoPng; /*UNSAFE copy to avoid having to cleanup! but we will only change primitive parameters, and not invoke the cleanup function nor touch the palette's buffer so we use it safely*/ - info.width = w; - info.height = h; - - if(encoder->settings.autoLeaveOutAlphaChannel && isFullyOpaque(image, w, h, &encoder->infoRaw.color)) - { - /*go to a color type without alpha channel*/ - if(info.color.colorType == 6) info.color.colorType = 2; - else if(info.color.colorType == 4) info.color.colorType = 0; - } - - if(encoder->settings.zlibsettings.windowSize > 32768) { encoder->error = 60; return; } /*error: windowsize larger than allowed*/ - if(encoder->settings.zlibsettings.btype > 2) { encoder->error = 61; return; } /*error: unexisting btype*/ - if(encoder->infoPng.interlaceMethod > 1) { encoder->error = 71; return; } /*error: unexisting interlace mode*/ - if((encoder->error = checkColorValidity(info.color.colorType, info.color.bitDepth))) return; /*error: unexisting color type given*/ - if((encoder->error = checkColorValidity(encoder->infoRaw.color.colorType, encoder->infoRaw.color.bitDepth))) return; /*error: unexisting color type given*/ - - if(!LodePNG_InfoColor_equal(&encoder->infoRaw.color, &info.color)) - { - unsigned char* converted; - size_t size = (w * h * LodePNG_InfoColor_getBpp(&info.color) + 7) / 8; - - if((info.color.colorType != 6 && info.color.colorType != 2) || (info.color.bitDepth != 8)) { encoder->error = 59; return; } /*for the output image, only these types are supported*/ - converted = (unsigned char*)malloc(size); - if(!converted && size) encoder->error = 9955; /*error: malloc failed*/ - if(!encoder->error) encoder->error = LodePNG_convert(converted, image, &info.color, &encoder->infoRaw.color, w, h); - if(!encoder->error) preProcessScanlines(&data, &datasize, converted, &info);/*filter(data.data, converted.data, w, h, LodePNG_InfoColor_getBpp(&info.color));*/ - free(converted); - } - else preProcessScanlines(&data, &datasize, image, &info);/*filter(data.data, image, w, h, LodePNG_InfoColor_getBpp(&info.color));*/ - - ucvector_init(&outv); - while(!encoder->error) /*not really a while loop, this is only used to break out if an error happens to avoid goto's to do the ucvector cleanup*/ - { -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - size_t i; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - /*write signature and chunks*/ - writeSignature(&outv); - /*IHDR*/ - addChunk_IHDR(&outv, w, h, info.color.bitDepth, info.color.colorType, info.interlaceMethod); -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - /*unknown chunks between IHDR and PLTE*/ - if(info.unknown_chunks.data[0]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[0], info.unknown_chunks.datasize[0]); if(encoder->error) break; } -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - /*PLTE*/ - if(info.color.colorType == 3) - { - if(info.color.palettesize == 0 || info.color.palettesize > 256) { encoder->error = 68; break; } - addChunk_PLTE(&outv, &info.color); - } - if(encoder->settings.force_palette && (info.color.colorType == 2 || info.color.colorType == 6)) - { - if(info.color.palettesize == 0 || info.color.palettesize > 256) { encoder->error = 68; break; } - addChunk_PLTE(&outv, &info.color); - } - /*tRNS*/ - if(info.color.colorType == 3 && !isPaletteFullyOpaque(info.color.palette, info.color.palettesize)) addChunk_tRNS(&outv, &info.color); - if((info.color.colorType == 0 || info.color.colorType == 2) && info.color.key_defined) addChunk_tRNS(&outv, &info.color); -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /*bKGD (must come between PLTE and the IDAt chunks*/ - if(info.background_defined) addChunk_bKGD(&outv, &info); - /*pHYs (must come before the IDAT chunks)*/ - if(info.phys_defined) addChunk_pHYs(&outv, &info); -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - /*unknown chunks between PLTE and IDAT*/ - if(info.unknown_chunks.data[1]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[1], info.unknown_chunks.datasize[1]); if(encoder->error) break; } -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - /*IDAT (multiple IDAT chunks must be consecutive)*/ - encoder->error = addChunk_IDAT(&outv, data, datasize, &encoder->settings.zlibsettings); - if(encoder->error) break; -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /*tIME*/ - if(info.time_defined) addChunk_tIME(&outv, &info.time); - /*tEXt and/or zTXt*/ - for(i = 0; i < info.text.num; i++) - { - if(strlen(info.text.keys[i]) > 79) { encoder->error = 66; break; } - if(strlen(info.text.keys[i]) < 1) { encoder->error = 67; break; } - if(encoder->settings.text_compression) - addChunk_zTXt(&outv, info.text.keys[i], info.text.strings[i], &encoder->settings.zlibsettings); - else - addChunk_tEXt(&outv, info.text.keys[i], info.text.strings[i]); - } - /*LodePNG version id in text chunk*/ - if(encoder->settings.add_id) - { - unsigned alread_added_id_text = 0; - for(i = 0; i < info.text.num; i++) - if(!strcmp(info.text.keys[i], "LodePNG")) { alread_added_id_text = 1; break; } - if(alread_added_id_text == 0) - addChunk_tEXt(&outv, "LodePNG", VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/ - } - /*iTXt*/ - for(i = 0; i < info.itext.num; i++) - { - if(strlen(info.itext.keys[i]) > 79) { encoder->error = 66; break; } - if(strlen(info.itext.keys[i]) < 1) { encoder->error = 67; break; } - addChunk_iTXt(&outv, encoder->settings.text_compression, - info.itext.keys[i], info.itext.langtags[i], info.itext.transkeys[i], info.itext.strings[i], - &encoder->settings.zlibsettings); - } -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - /*unknown chunks between IDAT and IEND*/ - if(info.unknown_chunks.data[2]) { encoder->error = addUnknownChunks(&outv, info.unknown_chunks.data[2], info.unknown_chunks.datasize[2]); if(encoder->error) break; } -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - /*IEND*/ - addChunk_IEND(&outv); - - break; /*this isn't really a while loop; no error happened so break out now!*/ - } - - free(data); - /*instead of cleaning the vector up, give it to the output*/ - *out = outv.data; - *outsize = outv.size; -} - -unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) -{ - unsigned error; - LodePNG_Encoder encoder; - LodePNG_Encoder_init(&encoder); - LodePNG_encode(&encoder, out, outsize, image, w, h); - error = encoder.error; - LodePNG_Encoder_cleanup(&encoder); - return error; -} - -#ifdef LODEPNG_COMPILE_DISK -unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h) -{ - unsigned char* buffer; - size_t buffersize; - unsigned error = LodePNG_encode32(&buffer, &buffersize, image, w, h); - LodePNG_saveFile(buffer, buffersize, filename); - free(buffer); - return error; -} -#endif /*LODEPNG_COMPILE_DISK*/ - -void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings) -{ - LodeZlib_DeflateSettings_init(&settings->zlibsettings); - settings->autoLeaveOutAlphaChannel = 1; - settings->force_palette = 0; -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - settings->add_id = 1; - settings->text_compression = 0; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -} - -void LodePNG_Encoder_init(LodePNG_Encoder* encoder) -{ - LodePNG_EncodeSettings_init(&encoder->settings); - LodePNG_InfoPng_init(&encoder->infoPng); - LodePNG_InfoRaw_init(&encoder->infoRaw); - encoder->error = 1; -} - -void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder) -{ - LodePNG_InfoPng_cleanup(&encoder->infoPng); - LodePNG_InfoRaw_cleanup(&encoder->infoRaw); -} - -void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source) -{ - LodePNG_Encoder_cleanup(dest); - *dest = *source; - LodePNG_InfoPng_init(&dest->infoPng); - LodePNG_InfoRaw_init(&dest->infoRaw); - dest->error = LodePNG_InfoPng_copy(&dest->infoPng, &source->infoPng); if(dest->error) return; - dest->error = LodePNG_InfoRaw_copy(&dest->infoRaw, &source->infoRaw); if(dest->error) return; -} - -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#endif /*LODEPNG_COMPILE_PNG*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / File IO / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_DISK - -unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename) /*designed for loading files from hard disk in a dynamically allocated buffer*/ -{ - FILE* file; - long size; - - /*provide some proper output values if error will happen*/ - *out = 0; - *outsize = 0; - - file = fopen(filename, "rb"); - if(!file) return 78; - - /*get filesize:*/ - fseek(file , 0 , SEEK_END); - size = ftell(file); - rewind(file); - - /*read contents of the file into the vector*/ - *outsize = 0; - *out = (unsigned char*)malloc((size_t)size); - if(size && (*out)) (*outsize) = fread(*out, 1, (size_t)size, file); - - fclose(file); - if(!(*out) && size) return 80; /*the above malloc failed*/ - return 0; -} - -/*write given buffer to the file, overwriting the file, it doesn't append to it.*/ -unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename) -{ - FILE* file; - file = fopen(filename, "wb" ); - if(!file) return 79; - fwrite((char*)buffer , 1 , buffersize, file); - fclose(file); - return 0; -} - -#endif /*LODEPNG_COMPILE_DISK*/ - -#ifdef __cplusplus -/* ////////////////////////////////////////////////////////////////////////// */ -/* / C++ RAII wrapper / */ -/* ////////////////////////////////////////////////////////////////////////// */ -#ifdef LODEPNG_COMPILE_ZLIB -namespace LodeZlib -{ -#ifdef LODEPNG_COMPILE_DECODER - unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings& settings) - { - unsigned char* buffer = 0; - size_t buffersize = 0; - unsigned error = LodeZlib_decompress(&buffer, &buffersize, in, insize, &settings); - if(buffer) - { - out.insert(out.end(), &buffer[0], &buffer[buffersize]); - free(buffer); - } - return error; - } - - unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DecompressSettings& settings) - { - return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings); - } -#endif //LODEPNG_COMPILE_DECODER -#ifdef LODEPNG_COMPILE_ENCODER - unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings& settings) - { - unsigned char* buffer = 0; - size_t buffersize = 0; - unsigned error = LodeZlib_compress(&buffer, &buffersize, in, insize, &settings); - if(buffer) - { - out.insert(out.end(), &buffer[0], &buffer[buffersize]); - free(buffer); - } - return error; - } - - unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DeflateSettings& settings) - { - return compress(out, in.empty() ? 0 : &in[0], in.size(), settings); - } -#endif //LODEPNG_COMPILE_ENCODER -} -#endif //LODEPNG_COMPILE_ZLIB - -namespace LodePNG -{ -#ifdef LODEPNG_COMPILE_DECODER - Decoder::Decoder() { LodePNG_Decoder_init(this); } - Decoder::~Decoder() { LodePNG_Decoder_cleanup(this); } - void Decoder::operator=(const LodePNG_Decoder& other) { LodePNG_Decoder_copy(this, &other); } - - bool Decoder::hasError() const { return error != 0; } - unsigned Decoder::getError() const { return error; } - - unsigned Decoder::getWidth() const { return infoPng.width; } - unsigned Decoder::getHeight() const { return infoPng.height; } - unsigned Decoder::getBpp() { return LodePNG_InfoColor_getBpp(&infoPng.color); } - unsigned Decoder::getChannels() { return LodePNG_InfoColor_getChannels(&infoPng.color); } - unsigned Decoder::isGreyscaleType() { return LodePNG_InfoColor_isGreyscaleType(&infoPng.color); } - unsigned Decoder::isAlphaType() { return LodePNG_InfoColor_isAlphaType(&infoPng.color); } - - void Decoder::decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize) - { - unsigned char* buffer; - size_t buffersize; - LodePNG_decode(this, &buffer, &buffersize, in, insize); - if(buffer) - { - out.insert(out.end(), &buffer[0], &buffer[buffersize]); - free(buffer); - } - } - - void Decoder::decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in) - { - decode(out, in.empty() ? 0 : &in[0], in.size()); - } - - void Decoder::inspect(const unsigned char* in, size_t size) - { - LodePNG_inspect(this, in, size); - } - - void Decoder::inspect(const std::vector<unsigned char>& in) - { - inspect(in.empty() ? 0 : &in[0], in.size()); - } - - const LodePNG_DecodeSettings& Decoder::getSettings() const { return settings; } - LodePNG_DecodeSettings& Decoder::getSettings() { return settings; } - void Decoder::setSettings(const LodePNG_DecodeSettings& settings) { this->settings = settings; } - - const LodePNG_InfoPng& Decoder::getInfoPng() const { return infoPng; } - LodePNG_InfoPng& Decoder::getInfoPng() { return infoPng; } - void Decoder::setInfoPng(const LodePNG_InfoPng& info) { error = LodePNG_InfoPng_copy(&this->infoPng, &info); } - void Decoder::swapInfoPng(LodePNG_InfoPng& info) { LodePNG_InfoPng_swap(&this->infoPng, &info); } - - const LodePNG_InfoRaw& Decoder::getInfoRaw() const { return infoRaw; } - LodePNG_InfoRaw& Decoder::getInfoRaw() { return infoRaw; } - void Decoder::setInfoRaw(const LodePNG_InfoRaw& info) { error = LodePNG_InfoRaw_copy(&this->infoRaw, &info); } -#endif //LODEPNG_COMPILE_DECODER - - /* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_ENCODER - Encoder::Encoder() { LodePNG_Encoder_init(this); } - Encoder::~Encoder() { LodePNG_Encoder_cleanup(this); } - void Encoder::operator=(const LodePNG_Encoder& other) { LodePNG_Encoder_copy(this, &other); } - - bool Encoder::hasError() const { return error != 0; } - unsigned Encoder::getError() const { return error; } - - void Encoder::encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h) - { - unsigned char* buffer; - size_t buffersize; - LodePNG_encode(this, &buffer, &buffersize, image, w, h); - if(buffer) - { - out.insert(out.end(), &buffer[0], &buffer[buffersize]); - free(buffer); - } - } - - void Encoder::encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h) - { - encode(out, image.empty() ? 0 : &image[0], w, h); - } - - void Encoder::clearPalette() { LodePNG_InfoColor_clearPalette(&infoPng.color); } - void Encoder::addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a) { error = LodePNG_InfoColor_addPalette(&infoPng.color, r, g, b, a); } -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - void Encoder::clearText() { LodePNG_Text_clear(&infoPng.text); } - void Encoder::addText(const std::string& key, const std::string& str) { error = LodePNG_Text_add(&infoPng.text, key.c_str(), str.c_str()); } - void Encoder::clearIText() { LodePNG_IText_clear(&infoPng.itext); } - void Encoder::addIText(const std::string& key, const std::string& langtag, const std::string& transkey, const std::string& str) { error = LodePNG_IText_add(&infoPng.itext, key.c_str(), langtag.c_str(), transkey.c_str(), str.c_str()); } -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - - const LodePNG_EncodeSettings& Encoder::getSettings() const { return settings; } - LodePNG_EncodeSettings& Encoder::getSettings() { return settings; } - void Encoder::setSettings(const LodePNG_EncodeSettings& settings) { this->settings = settings; } - - const LodePNG_InfoPng& Encoder::getInfoPng() const { return infoPng; } - LodePNG_InfoPng& Encoder::getInfoPng() { return infoPng; } - void Encoder::setInfoPng(const LodePNG_InfoPng& info) { error = LodePNG_InfoPng_copy(&this->infoPng, &info); } - void Encoder::swapInfoPng(LodePNG_InfoPng& info) { LodePNG_InfoPng_swap(&this->infoPng, &info); } - - const LodePNG_InfoRaw& Encoder::getInfoRaw() const { return infoRaw; } - LodePNG_InfoRaw& Encoder::getInfoRaw() { return infoRaw; } - void Encoder::setInfoRaw(const LodePNG_InfoRaw& info) { error = LodePNG_InfoRaw_copy(&this->infoRaw, &info); } -#endif //LODEPNG_COMPILE_ENCODER - /* ////////////////////////////////////////////////////////////////////////// */ - -//#ifdef LODEPNG_COMPILE_DISK - - void loadFile(std::vector<unsigned char>& buffer, ReaderPtr<Reader> & reader) //designed for loading files from hard disk in an std::vector - { - uint64_t const sz = reader.Size(); - if (sz > 0) - { - buffer.resize(sz); - reader.Read(0, &buffer[0], sz); - } - } - - /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ - void saveFile(const std::vector<unsigned char>& buffer, WriterPtr<Writer> &writer) - { - size_t const sz = buffer.size(); - if (sz > 0) - { - writer.Write(&buffer[0], sz); - } - } - -//#endif /*LODEPNG_COMPILE_DISK*/ - - /* ////////////////////////////////////////////////////////////////////////// */ -#ifdef LODEPNG_COMPILE_DECODER - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size, unsigned colorType, unsigned bitDepth) - { - Decoder decoder; - decoder.getInfoRaw().color.colorType = colorType; - decoder.getInfoRaw().color.bitDepth = bitDepth; - decoder.decode(out, in, size); - w = decoder.getWidth(); - h = decoder.getHeight(); - return decoder.getError(); - } - - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in, unsigned colorType, unsigned bitDepth) - { - return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colorType, bitDepth); - } -#ifdef LODEPNG_COMPILE_DISK - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename, unsigned colorType, unsigned bitDepth) - { - std::vector<unsigned char> buffer; - loadFile(buffer, filename); - return decode(out, w, h, buffer, colorType, bitDepth); - } -#endif /*LODEPNG_COMPILE_DISK*/ -#endif //LODEPNG_COMPILE_DECODER - -#ifdef LODEPNG_COMPILE_ENCODER - unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) - { - Encoder encoder; - encoder.getInfoRaw().color.colorType = colorType; - encoder.getInfoRaw().color.bitDepth = bitDepth; - encoder.encode(out, in, w, h); - return encoder.getError(); - } - - unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) - { - return encode(out, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth); - } - -#ifdef LODEPNG_COMPILE_DISK - unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) - { - std::vector<unsigned char> buffer; - Encoder encoder; - encoder.getInfoRaw().color.colorType = colorType; - encoder.getInfoRaw().color.bitDepth = bitDepth; - encoder.encode(buffer, in, w, h); - if(!encoder.hasError()) saveFile(buffer, filename); - return encoder.getError(); - } - - unsigned encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth) - { - return encode(filename, in.empty() ? 0 : &in[0], w, h, colorType, bitDepth); - } -#endif /*LODEPNG_COMPILE_DISK*/ -#endif // LODEPNG_COMPILE_ENCODER -} -#endif /*__cplusplus C++ RAII wrapper*/ diff --git a/3party/lodepng/lodepng.hpp b/3party/lodepng/lodepng.hpp deleted file mode 100644 index bc71df1650..0000000000 --- a/3party/lodepng/lodepng.hpp +++ /dev/null @@ -1,1713 +0,0 @@ -/* -LodePNG version 20100314 - -Copyright (c) 2005-2010 Lode Vandevenne - -This software is provided 'as-is', without any express or implied -warranty. In no event will the authors be held liable for any damages -arising from the use of this software. - -Permission is granted to anyone to use this software for any purpose, -including commercial applications, and to alter it and redistribute it -freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - - 3. This notice may not be removed or altered from any source - distribution. -*/ - -#ifndef LODEPNG_H -#define LODEPNG_H - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "coding/reader.hpp" -#include "coding/writer.hpp" - -/* ////////////////////////////////////////////////////////////////////////// */ -/* Code Sections */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*The following defines can be commented disable code sections. Gives potential faster compile and smaller binary.*/ - -#define LODEPNG_COMPILE_ZLIB /*deflate&zlib encoder and deflate&zlib decoder*/ -#define LODEPNG_COMPILE_PNG /*png encoder and png decoder*/ -#define LODEPNG_COMPILE_DECODER /*deflate&zlib decoder and png decoder*/ -#define LODEPNG_COMPILE_ENCODER /*deflate&zlib encoder and png encoder*/ -//#define LODEPNG_COMPILE_DISK /*the optional built in harddisk file loading and saving functions*/ -//#define LODEPNG_COMPILE_ANCILLARY_CHUNKS /*any code or struct datamember related to chunks other than IHDR, IDAT, PLTE, tRNS, IEND*/ -//#define LODEPNG_COMPILE_UNKNOWN_CHUNKS /*handling of unknown chunks*/ - -/* ////////////////////////////////////////////////////////////////////////// */ -/* LodeFlate & LodeZlib Setting structs */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_DECODER -typedef struct LodeZlib_DecompressSettings -{ - unsigned ignoreAdler32; -} LodeZlib_DecompressSettings; - -extern const LodeZlib_DecompressSettings LodeZlib_defaultDecompressSettings; -void LodeZlib_DecompressSettings_init(LodeZlib_DecompressSettings* settings); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -typedef struct LodeZlib_DeflateSettings /*deflate = compress*/ -{ - /*LZ77 related settings*/ - unsigned btype; /*the block type for LZ*/ - unsigned useLZ77; /*whether or not to use LZ77*/ - unsigned windowSize; /*the maximum is 32768*/ -} LodeZlib_DeflateSettings; - -extern const LodeZlib_DeflateSettings LodeZlib_defaultDeflateSettings; -void LodeZlib_DeflateSettings_init(LodeZlib_DeflateSettings* settings); -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#ifdef LODEPNG_COMPILE_ZLIB -/* ////////////////////////////////////////////////////////////////////////// */ -/* LodeFlate & LodeZlib */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#ifdef LODEPNG_COMPILE_DECODER -/*This function reallocates the out buffer and appends the data. -Either, *out must be NULL and *outsize must be 0, or, *out must be a valid buffer and *outsize its size in bytes.*/ -unsigned LodeZlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings* settings); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -/*This function reallocates the out buffer and appends the data. -Either, *out must be NULL and *outsize must be 0, or, *out must be a valid buffer and *outsize its size in bytes.*/ -unsigned LodeZlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings* settings); -#endif /*LODEPNG_COMPILE_ENCODER*/ -#endif /*LODEPNG_COMPILE_ZLIB*/ - -#ifdef LODEPNG_COMPILE_PNG - -/* ////////////////////////////////////////////////////////////////////////// */ -/* LodePNG */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*LodePNG_chunk functions: These functions need as input a large enough amount of allocated memory.*/ - -unsigned LodePNG_chunk_length(const unsigned char* chunk); /*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/ - -void LodePNG_chunk_type(char type[5], const unsigned char* chunk); /*puts the 4-byte type in null terminated string*/ -unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type); /*check if the type is the given type*/ - -/*properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard*/ -unsigned char LodePNG_chunk_critical(const unsigned char* chunk); /*0: ancillary chunk, 1: it's one of the critical chunk types*/ -unsigned char LodePNG_chunk_private(const unsigned char* chunk); /*0: public, 1: private*/ -unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk); /*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/ - -unsigned char* LodePNG_chunk_data(unsigned char* chunk); /*get pointer to the data of the chunk*/ -const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk); /*get pointer to the data of the chunk*/ - -unsigned LodePNG_chunk_check_crc(const unsigned char* chunk); /*returns 0 if the crc is correct, 1 if it's incorrect*/ -void LodePNG_chunk_generate_crc(unsigned char* chunk); /*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ - -/*iterate to next chunks.*/ -unsigned char* LodePNG_chunk_next(unsigned char* chunk); -const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk); - -/*add chunks to out buffer. It reallocs the buffer to append the data. returns error code*/ -unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk); /*appends chunk that was already created, to the data. Returns pointer to start of appended chunk, or NULL if error happened*/ -unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data); /*appends new chunk to out. Returns pointer to start of appended chunk, or NULL if error happened; may change memory address of out buffer*/ - -typedef struct LodePNG_InfoColor /*info about the color type of an image*/ -{ - /*header (IHDR)*/ - unsigned colorType; /*color type*/ - unsigned bitDepth; /*bits per sample*/ - - /*palette (PLTE)*/ - unsigned char* palette; /*palette in RGBARGBA... order*/ - size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/ - - /*transparent color key (tRNS)*/ - unsigned key_defined; /*is a transparent color key given?*/ - unsigned key_r; /*red component of color key*/ - unsigned key_g; /*green component of color key*/ - unsigned key_b; /*blue component of color key*/ -} LodePNG_InfoColor; - -void LodePNG_InfoColor_init(LodePNG_InfoColor* info); -void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info); -unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source); - -/*Use these functions instead of allocating palette manually*/ -void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info); -unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r, unsigned char g, unsigned char b, unsigned char a); /*add 1 color to the palette*/ - -/*additional color info*/ -unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info); /*bits per pixel*/ -unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info); /*amount of channels*/ -unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info); /*is it a greyscale type? (colorType 0 or 4)*/ -unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info); /*has it an alpha channel? (colorType 2 or 6)*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -typedef struct LodePNG_Time /*LodePNG's encoder does not generate the current time. To make it add a time chunk the correct time has to be provided*/ -{ - unsigned year; /*2 bytes*/ - unsigned char month; /*1-12*/ - unsigned char day; /*1-31*/ - unsigned char hour; /*0-23*/ - unsigned char minute; /*0-59*/ - unsigned char second; /*0-60 (to allow for leap seconds)*/ -} LodePNG_Time; - -typedef struct LodePNG_Text /*non-international text*/ -{ - size_t num; - char** keys; /*the keyword of a text chunk (e.g. "Comment")*/ - char** strings; /*the actual text*/ -} LodePNG_Text; - -void LodePNG_Text_init(LodePNG_Text* text); -void LodePNG_Text_cleanup(LodePNG_Text* text); -unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source); - -/*Use these functions instead of allocating the char**s manually*/ -void LodePNG_Text_clear(LodePNG_Text* text); -unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str); /*push back both texts at once*/ - - -typedef struct LodePNG_IText /*international text*/ -{ - size_t num; - char** keys; /*the English keyword of the text chunk (e.g. "Comment")*/ - char** langtags; /*the language tag for this text's international language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ - char** transkeys; /*keyword translated to the international language - UTF-8 string*/ - char** strings; /*the actual international text - UTF-8 string*/ -} LodePNG_IText; - -void LodePNG_IText_init(LodePNG_IText* text); -void LodePNG_IText_cleanup(LodePNG_IText* text); -unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source); - -/*Use these functions instead of allocating the char**s manually*/ -void LodePNG_IText_clear(LodePNG_IText* text); -unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag, const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS -typedef struct LodePNG_UnknownChunks /*unknown chunks read from the PNG, or extra chunks the user wants to have added in the encoded PNG*/ -{ - /*There are 3 buffers, one for each position in the PNG where unknown chunks can appear - each buffer contains all unknown chunks for that position consecutively - The 3 buffers are the unknown chunks between certain critical chunks: - 0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND*/ - unsigned char* data[3]; - size_t datasize[3]; /*size in bytes of the unknown chunks, given for protection*/ - -} LodePNG_UnknownChunks; - -void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks); -void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks); -unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src); -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - -typedef struct LodePNG_InfoPng /*information about the PNG image, except pixels and sometimes except width and height*/ -{ - /*header (IHDR), palette (PLTE) and transparency (tRNS)*/ - unsigned width; /*width of the image in pixels (ignored by encoder, but filled in by decoder)*/ - unsigned height; /*height of the image in pixels (ignored by encoder, but filled in by decoder)*/ - unsigned compressionMethod; /*compression method of the original file*/ - unsigned filterMethod; /*filter method of the original file*/ - unsigned interlaceMethod; /*interlace method of the original file*/ - LodePNG_InfoColor color; /*color type and bits, palette, transparency*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - - /*suggested background color (bKGD)*/ - unsigned background_defined; /*is a suggested background color given?*/ - unsigned background_r; /*red component of suggested background color*/ - unsigned background_g; /*green component of suggested background color*/ - unsigned background_b; /*blue component of suggested background color*/ - - /*non-international text chunks (tEXt and zTXt)*/ - LodePNG_Text text; - - /*international text chunks (iTXt)*/ - LodePNG_IText itext; - - /*time chunk (tIME)*/ - unsigned char time_defined; /*if 0, no tIME chunk was or will be generated in the PNG image*/ - LodePNG_Time time; - - /*phys chunk (pHYs)*/ - unsigned phys_defined; /*is pHYs chunk defined?*/ - unsigned phys_x; - unsigned phys_y; - unsigned char phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ - -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - /*unknown chunks*/ - LodePNG_UnknownChunks unknown_chunks; -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ - -} LodePNG_InfoPng; - -void LodePNG_InfoPng_init(LodePNG_InfoPng* info); -void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info); -unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source); - -typedef struct LodePNG_InfoRaw /*contains user-chosen information about the raw image data, which is independent of the PNG image*/ -{ - LodePNG_InfoColor color; -} LodePNG_InfoRaw; - -void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info); -void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info); -unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source); - -/* -LodePNG_convert: Converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code -The out buffer must have (w * h * bpp + 7) / 8, where bpp is the bits per pixel of the output color type (LodePNG_InfoColor_getBpp) -*/ -unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut, LodePNG_InfoColor* infoIn, unsigned w, unsigned h); - -#ifdef LODEPNG_COMPILE_DECODER - -typedef struct LodePNG_DecodeSettings -{ - LodeZlib_DecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ - - unsigned ignoreCrc; /*ignore CRC checksums*/ - unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - unsigned readTextChunks; /*if false but rememberUnknownChunks is true, they're stored in the unknown chunks*/ -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS - unsigned rememberUnknownChunks; /*store all bytes from unknown chunks in the InfoPng (off by default, useful for a png editor)*/ -#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/ -} LodePNG_DecodeSettings; - -void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings); - -typedef struct LodePNG_Decoder -{ - LodePNG_DecodeSettings settings; - LodePNG_InfoRaw infoRaw; - LodePNG_InfoPng infoPng; /*info of the PNG image obtained after decoding*/ - unsigned error; -} LodePNG_Decoder; - -void LodePNG_Decoder_init(LodePNG_Decoder* decoder); -void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder); -void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source); - -/*decoding functions*/ -/*This function allocates the out buffer and stores the size in *outsize.*/ -void LodePNG_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize); -unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize); /*return value is error*/ -#ifdef LODEPNG_COMPILE_DISK -unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename); -#endif /*LODEPNG_COMPILE_DISK*/ -void LodePNG_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t size); /*read the png header*/ - -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER - -typedef struct LodePNG_EncodeSettings -{ - LodeZlib_DeflateSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ - - unsigned autoLeaveOutAlphaChannel; /*automatically use color type without alpha instead of given one, if given image is opaque*/ - unsigned force_palette; /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). If colortype is 3, PLTE is _always_ created.*/ -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - unsigned add_id; /*add LodePNG version as text chunk*/ - unsigned text_compression; /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -} LodePNG_EncodeSettings; - -void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings); - -typedef struct LodePNG_Encoder -{ - LodePNG_EncodeSettings settings; - LodePNG_InfoPng infoPng; /*the info specified by the user may not be changed by the encoder. The encoder will try to generate a PNG close to the given info.*/ - LodePNG_InfoRaw infoRaw; /*put the properties of the input raw image in here*/ - unsigned error; -} LodePNG_Encoder; - -void LodePNG_Encoder_init(LodePNG_Encoder* encoder); -void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder); -void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source); - -/*This function allocates the out buffer and stores the size in *outsize.*/ -void LodePNG_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); -unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); /*return value is error*/ -#ifdef LODEPNG_COMPILE_DISK -unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h); -#endif /*LODEPNG_COMPILE_DISK*/ -#endif /*LODEPNG_COMPILE_ENCODER*/ -#endif /*LODEPNG_COMPILE_PNG*/ - -#ifdef LODEPNG_COMPILE_DISK -/*free functions allowing to load and save a file from/to harddisk*/ -/*This function allocates the out buffer and stores the size in *outsize.*/ -unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename); -unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename); -#endif /*LODEPNG_COMPILE_DISK*/ - -#ifdef __cplusplus - -//LodePNG C++ wrapper: wraps interface with destructors and std::vectors around the harder to use C version - -#include <vector> -#include <string> - -#ifdef LODEPNG_COMPILE_ZLIB -namespace LodeZlib -{ -#ifdef LODEPNG_COMPILE_DECODER - unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, const LodeZlib_DecompressSettings& settings = LodeZlib_defaultDecompressSettings); - unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DecompressSettings& settings = LodeZlib_defaultDecompressSettings); -#endif //LODEPNG_COMPILE_DECODER -#ifdef LODEPNG_COMPILE_ENCODER - unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, const LodeZlib_DeflateSettings& settings = LodeZlib_defaultDeflateSettings); - unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, const LodeZlib_DeflateSettings& settings = LodeZlib_defaultDeflateSettings); -#endif //LODEPNG_COMPILE_ENCODER -} -#endif //LODEPNG_COMPILE_ZLIB - -#ifdef LODEPNG_COMPILE_PNG -namespace LodePNG -{ - -#ifdef LODEPNG_COMPILE_DECODER - class Decoder : public LodePNG_Decoder - { - public: - - Decoder(); - ~Decoder(); - void operator=(const LodePNG_Decoder& other); - - //decoding functions - void decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize); - void decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in); - - void inspect(const unsigned char* in, size_t size); - void inspect(const std::vector<unsigned char>& in); - - //error checking after decoding - bool hasError() const; - unsigned getError() const; - - //convenient access to some InfoPng parameters after decoding - unsigned getWidth() const; - unsigned getHeight() const; - unsigned getBpp(); //bits per pixel - unsigned getChannels(); //amount of channels - unsigned isGreyscaleType(); //is it a greyscale type? (colorType 0 or 4) - unsigned isAlphaType(); //has it an alpha channel? (colorType 2 or 6) - - const LodePNG_DecodeSettings& getSettings() const; - LodePNG_DecodeSettings& getSettings(); - void setSettings(const LodePNG_DecodeSettings& info); - - const LodePNG_InfoPng& getInfoPng() const; - LodePNG_InfoPng& getInfoPng(); - void setInfoPng(const LodePNG_InfoPng& info); - void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng - - const LodePNG_InfoRaw& getInfoRaw() const; - LodePNG_InfoRaw& getInfoRaw(); - void setInfoRaw(const LodePNG_InfoRaw& info); - }; - - //simple functions for encoding/decoding the PNG in one call (RAW image always 32-bit) - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size, unsigned colorType = 6, unsigned bitDepth = 8); - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in, unsigned colorType = 6, unsigned bitDepth = 8); -#ifdef LODEPNG_COMPILE_DISK - unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename, unsigned colorType = 6, unsigned bitDepth = 8); -#endif //LODEPNG_COMPILE_DISK -#endif //LODEPNG_COMPILE_DECODER - -#ifdef LODEPNG_COMPILE_ENCODER - class Encoder : public LodePNG_Encoder - { - public: - - Encoder(); - ~Encoder(); - void operator=(const LodePNG_Encoder& other); - - void encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h); - void encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h); - - //error checking after decoding - bool hasError() const; - unsigned getError() const; - - //convenient direct access to some parameters of the InfoPng - void clearPalette(); - void addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a); //add 1 color to the palette -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - void clearText(); - void addText(const std::string& key, const std::string& str); //push back both texts at once - void clearIText(); - void addIText(const std::string& key, const std::string& langtag, const std::string& transkey, const std::string& str); -#endif //LODEPNG_COMPILE_ANCILLARY_CHUNKS - - const LodePNG_EncodeSettings& getSettings() const; - LodePNG_EncodeSettings& getSettings(); - void setSettings(const LodePNG_EncodeSettings& info); - - const LodePNG_InfoPng& getInfoPng() const; - LodePNG_InfoPng& getInfoPng(); - void setInfoPng(const LodePNG_InfoPng& info); - void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng - - const LodePNG_InfoRaw& getInfoRaw() const; - LodePNG_InfoRaw& getInfoRaw(); - void setInfoRaw(const LodePNG_InfoRaw& info); - }; - - unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); - unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); -#ifdef LODEPNG_COMPILE_DISK - unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); - unsigned encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h, unsigned colorType = 6, unsigned bitDepth = 8); -#endif //LODEPNG_COMPILE_DISK -#endif //LODEPNG_COMPILE_ENCODER - -//#ifdef LODEPNG_COMPILE_DISK - //free functions allowing to load and save a file from/to harddisk - void loadFile(std::vector<unsigned char>& buffer, ReaderPtr<Reader> & reader); - void saveFile(const std::vector<unsigned char>& buffer, WriterPtr<Writer> & writer); -//#endif //LODEPNG_COMPILE_DISK - -} //namespace LodePNG - -#endif //LODEPNG_COMPILE_PNG - -#endif /*end of __cplusplus wrapper*/ - -/* -TODO: -[ ] test if there are no memory leaks or security exploits - done a lot but needs to be checked often -[ ] LZ77 encoder more like the one described in zlib - to make sure it's patentfree -[ ] converting color to 16-bit types -[ ] read all public PNG chunk types (but never let the color profile and gamma ones ever touch RGB values, that is very annoying for textures as well as images in a browser) -[ ] make sure encoder generates no chunks with size > (2^31)-1 -[ ] partial decoding (stream processing) -[ ] let the "isFullyOpaque" function check color keys and transparent palettes too -[ ] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" -[ ] check compatibility with vareous compilers - done but needs to be redone for every newer version -[ ] don't stop decoding on errors like 69, 57, 58 (make warnings that the decoder stores in the error at the very end? and make some errors just let it stop with this one chunk but still do the next ones) -[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not, if people like storing raw images that way -*/ - -#endif - -/* -LodePNG Documentation ---------------------- - -0. table of contents --------------------- - - 1. about - 1.1. supported features - 1.2. features not supported - 2. C and C++ version - 3. A note about security! - 4. simple functions - 4.1 C Simple Functions - 4.2 C++ Simple Functions - 5. decoder - 6. encoder - 7. color conversions - 8. info values - 9. error values - 10. file IO - 11. chunks and PNG editing - 12. compiler support - 13. examples - 13.1. decoder example - 13.2. encoder example - 14. LodeZlib - 15. changes - 16. contact information - - -1. about --------- - -PNG is a file format to store raster images losslessly with good compression, -supporting different color types. It can be implemented in a patent-free way. - -LodePNG is a PNG codec according to the Portable Network Graphics (PNG) -Specification (Second Edition) - W3C Recommendation 10 November 2003. - -The specifications used are: - -*) Portable Network Graphics (PNG) Specification (Second Edition): - http://www.w3.org/TR/2003/REC-PNG-20031110 -*) RFC 1950 ZLIB Compressed Data Format version 3.3: - http://www.gzip.org/zlib/rfc-zlib.html -*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: - http://www.gzip.org/zlib/rfc-deflate.html - -The most recent version of LodePNG can currently be found at -http://members.gamedev.net/lode/projects/LodePNG/ - -LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds -extra functionality. - -LodePNG exists out of two files: --lodepng.h: the header file for both C and C++ --lodepng.c(pp): give it the name lodepng.c or lodepng.cpp depending on your usage - -If you want to start using LodePNG right away without reading this doc, get the -files lodepng_examples.c or lodepng_examples.cpp to see how to use it in code, -or check the (smaller) examples in chapter 13 here. - -LodePNG is simple but only supports the basic requirements. To achieve -simplicity, the following design choices were made: There are no dependencies -on any external library. To decode PNGs, there's a Decoder struct or class that -can convert any PNG file data into an RGBA image buffer with a single function -call. To encode PNGs, there's an Encoder struct or class that can convert image -data into PNG file data with a single function call. To read and write files, -there are simple functions to convert the files to/from buffers in memory. - -This all makes LodePNG suitable for loading textures in games, demoscene -productions, saving a screenshot, images in programs that require them for simple -usage, ... It's less suitable for full fledged image editors, loading PNGs -over network (it requires all the image data to be available before decoding can -begin), life-critical systems, ... -LodePNG has a standards conformant decoder and encoder, and supports the ability -to make a somewhat conformant editor. - -1.1. supported features ------------------------ - -The following features are supported by the decoder: - -*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, or the same color type as the PNG -*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image -*) Adam7 interlace and deinterlace for any color type -*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk -*) support for alpha channels, including RGBA color model, translucent palettes and color keying -*) zlib decompression (inflate) -*) zlib compression (deflate) -*) CRC32 and ADLER32 checksums -*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. -*) the following chunks are supported (generated/interpreted) by both encoder and decoder: - IHDR: header information - PLTE: color palette - IDAT: pixel data - IEND: the final chunk - tRNS: transparency for palettized images - tEXt: textual information - zTXt: compressed textual information - iTXt: international textual information - bKGD: suggested background color - pHYs: physical dimensions - tIME: modification time - -1.2. features not supported ---------------------------- - -The following features are _not_ supported: - -*) some features needed to make a conformant PNG-Editor might be still missing. -*) partial loading/stream processing. All data must be available and is processed in one call. -*) The following public chunks are not supported but treated as unknown chunks by LodePNG - cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT - - -2. C and C++ version --------------------- - -The C version uses buffers allocated with alloc instead that you need to free() -yourself. On top of that, you need to use init and cleanup functions for each -struct whenever using a struct from the C version to avoid exploits and memory leaks. - -The C++ version has constructors and destructors that take care of these things, -and uses std::vectors in the interface for storing data. - -Both the C and the C++ version are contained in this file! The C++ code depends on -the C code, the C code works on its own. - -These files work without modification for both C and C++ compilers because all the -additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers ignore -it, and the C code is made to compile both with strict ISO C90 and C++. - -To use the C++ version, you need to rename the source file to lodepng.cpp (instead -of lodepng.c), and compile it with a C++ compiler. - -To use the C version, you need to rename the source file to lodepng.c (instead -of lodepng.cpp), and compile it with a C compiler. - - -3. A note about security! -------------------------- - -Despite being used already and having received bug fixes whenever bugs were reported, -LodePNG may still contain possible exploits. - -If you discover a possible exploit, please let me know, and it will be eliminated. - -When using LodePNG, care has to be taken with the C version of LodePNG, as well as the C-style -structs when working with C++. The following conventions are used for all C-style structs: - --if a struct has a corresponding init function, always call the init function when making a new one, to avoid exploits --if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks --if a struct has a corresponding copy function, use the copy function instead of "=". The destination must be inited already! - - -4. "Simple" Functions ---------------------- - -For the most simple usage cases of loading and saving a PNG image, there -are some simple functions that do everything in 1 call (instead of you -having to instantiate a struct or class). - -The simple versions always use 32-bit RGBA color for the raw image, but -still support loading arbitrary-colortype PNG images. - -The later sections of this manual are devoted to the complex versions, where -you can use other color types and conversions. - -4.1 C Simple Functions ----------------------- - -The C simple functions have a "32" or "32f" in their name, and don't take a struct as -parameter, unlike the non-simple ones (see more down in the documentation). - -unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize); - -Load PNG from given buffer. -As input, give an unsigned char* buffer gotten by loading the .png file and its size. -As output, you get a dynamically allocated buffer of large enough size, and the width and height of the image. -The buffer's size is w * h * 4. The image is in RGBA format. -The return value is the error (0 if ok). -You need to do free(out) after usage to clean up the memory. - -unsigned LodePNG_decode32f(unsigned char** out, unsigned* w, unsigned* h, const char* filename); - -Load PNG from disk, from file with given name. -Same as decode32, except you give a filename instead of an input buffer. - -unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h); - -Encode PNG into buffer. -As input, give a image buffer of size w * h * 4, in RGBA format. -As output, you get a dynamically allocated buffer and its size, which is a PNG file that can -directly be saved in this form to the harddisk. -The return value is the error (0 if ok). -You need to do free(out) after usage to clean up the memory. - -unsigned LodePNG_encode32f(const char* filename, const unsigned char* image, unsigned w, unsigned h); - -Encode PNG into file on disk with given name. -If the file exists, it's overwritten without warning! -Same parameters as encode2, except the result is stored in a file instead of a dynamic buffer. - -4.2 C++ Simple Functions ------------------------- - -For decoding a PNG there are: - -unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, unsigned size); -unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::vector<unsigned char>& in); -unsigned LodePNG::decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename); - -These store the pixel data as 32-bit RGBA color in the out vector, and the width -and height of the image in w and h. -The 3 functions each have a different input type: The first as unsigned char -buffer, the second as std::vector buffer, and the third allows you to give the -filename in case you want to load the PNG from disk instead of from a buffer. -The return value is the error (0 if ok). - -For encoding a PNG there are: - -unsigned LodePNG::encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h); -unsigned LodePNG::encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, unsigned w, unsigned h); -unsigned LodePNG::encode(const std::string& filename, const std::vector<unsigned char>& in, unsigned w, unsigned h); -unsigned LodePNG::encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h); - -Specify the width and height of the input image with w and h. -You can choose to get the output in an std::vector or stored in a file, and -the input can come from an std::vector or an unsigned char* buffer. The input -buffer must be in RGBA format and the size must be w * h * 4 bytes. - -The first two functions append to the out buffer, they don't clear it, clear it -first before encoding into a buffer that you expect to only contain this result. - -On the other hand, the functions that encode to a file will completely overwrite -the original file without warning if it exists. - -The return value is the error (0 if ok). - -5. Decoder ----------- - -This is about the LodePNG_Decoder struct in the C version, and the -LodePNG::Decoder class in the C++ version. The C++ version inherits -from the C struct and adds functions in the interface. - -The Decoder class can be used to convert a PNG image to a raw image. - -Usage: - --in C++: - declare a LodePNG::Decoder - call its decode member function with the parameters described below - --in C more needs to be done due to the lack of constructors and destructors: - declare a LodePNG_Decoder struct - call LodePNG_Decoder_init with the struct as parameter - call LodePNG_Decode with the parameters described below - after usage, call LodePNG_Decoder_cleanup with the struct as parameter - after usage, free() the out buffer with image data that was created by the decode function - -The other parameters of the decode function are: -*) out: this buffer will be filled with the raw image pixels -*) in: pointer to the PNG image data or std::vector with the data -*) size: the size of the PNG image data (not needed for std::vector version) - -After decoding you need to read the width and height of the image from the -decoder, see further down in this manual to see how. - -There's also an optional function "inspect". It has the same parameters as decode except -the "out" parameter. This function will read only the header chunk of the PNG -image, and store the information from it in the LodePNG_InfoPng (see below). -This allows knowing information about the image without decoding it. Only the -header (IHDR) information is read by this, not text chunks, not the palette, ... - -During the decoding it's possible that an error can happen, for example if the -PNG image was corrupted. To check if an error happened during the last decoding, -check the value error, which is a member of the decoder struct. -In the C++ version, use hasError() and getError() of the Decoder. -The error codes are explained in another section. - -Now about colors and settings... - -The Decoder contains 3 components: -*) LodePNG_InfoPng: it stores information about the PNG (the input) in an LodePNG_InfoPng struct, don't modify this one yourself -*) Settings: you can specify a few other settings for the decoder to use -*) LodePNG_InfoRaw: here you can say what type of raw image (the output) you want to get - -Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color". -In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their -init and cleanup functions, but normally you use the ones in the decoder that are already handled -in the init and cleanup functions of the decoder itself. - -=LodePNG_InfoPng= - -This contains information such as the original color type of the PNG image, text -comments, suggested background color, etc... More details about the LodePNG_InfoPng struct -are in another section. - -Because the dimensions of the image are important, there are shortcuts to get them in the -C++ version: use decoder.getWidth() and decoder.getHeight(). -In the C version, use decoder.infoPng.width and decoder.infoPng.height. - -=LodePNG_InfoRaw= - -In the LodePNG_InfoRaw struct of the Decoder, you can specify which color type you want -the resulting raw image to be. If this is different from the colorType of the -PNG, then the decoder will automatically convert the result to your LodePNG_InfoRaw -settings. Currently the following options are supported to convert to: --colorType 6, bitDepth 8: 32-bit RGBA --colorType 2, bitDepth 8: 24-bit RGB --other color types if it's exactly the same as that in the PNG image - -Palette of LodePNG_InfoRaw isn't used by the Decoder, when converting from palette color -to palette color, the values of the pixels are left untouched so that the colors -will change if the palette is different. Color key of LodePNG_InfoRaw is not used by the -Decoder. If setting color_convert is false then LodePNG_InfoRaw is completely ignored, -but it will be modified to match the color type of the PNG so will be overwritten. - -By default, 32-bit color is used for the result. - -=Settings= - -The Settings can be used to ignore the errors created by invalid CRC and Adler32 -chunks, and to disable the decoding of tEXt chunks. - -There's also a setting color_convert, true by default. If false, no conversion -is done, the resulting data will be as it was in the PNG (after decompression) -and you'll have to puzzle the colors of the pixels together yourself using the -color type information in the LodePNG_InfoPng. - - -6. Encoder ----------- - -This is about the LodePNG_Encoder struct in the C version, and the -LodePNG::Encoder class in the C++ version. - -The Encoder class can be used to convert raw image data into a PNG image. - -The PNG part of the encoder is working good, the zlib compression part is -becoming quite fine but not as good as the official zlib yet, because it's not -as fast and doesn't provide an as high compression ratio. - -Usage: - --in C++: - declare a LodePNG::Encoder - call its encode member function with the parameters described below - --in C more needs to be done due to the lack of constructors and destructors: - declare a LodePNG_Encoder struct - call LodePNG_Encoder_init with the struct as parameter - call LodePNG_Encode with the parameters described below - after usage, call LodePNG_Encoder_cleanup with the struct as parameter - after usage, free() the out buffer with PNG data that was created by the encode function - -The raw image given to the encoder is an unsigned char* buffer. You also have to -specify the width and height of the raw image. The result is stored in a given -buffer. These buffers can be unsigned char* pointers, std::vectors or dynamically -allocated unsigned char* buffers that you have to free() yourself, depending on -which you use. - -The parameters of the encode function are: -*) out: in this buffer the PNG file data will be stored (it will be appended) -*) in: vector of or pointer to a buffer containing the raw image -*) w and h: the width and height of the raw image in pixels - -Make sure that the in buffer you provide, is big enough to contain w * h pixels -of the color type specified by the LodePNG_InfoRaw. - -In the C version, you need to free() the out buffer after usage to avoid memory leaks. -In the C version, you need to use the LodePNG_Encoder_init function before using the decoder, -and the LodePNG_Encoder_cleanup function after using it. -In the C++ version, you don't need to do this since RAII takes care of it. - -The encoder generates some errors but not for everything, because, unlike when -decoding a PNG, when encoding one there aren't so much parameters of the input -that can be corrupted. It's the responsibility of the user to make sure that all -preconditions are satesfied, such as giving a correct window size, giving an -existing btype, making sure the given buffer is large enough to contain an image -with the given width and height and colortype, ... The encoder can generate -some errors, see the section with the explanations of errors for those. - -Like the Decoder, the Encoder has 3 components: -*) LodePNG_InfoRaw: here you say what color type of the raw image (the input) has -*) Settings: you can specify a few settings for the encoder to use -*) LodePNG_InfoPng: the same LodePNG_InfoPng struct as created by the Decoder. For the encoder, -with this you specify how you want the PNG (the output) to be. - -Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color". -In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their -init and cleanup functions, but normally you use the ones in the encoder that are already handled -in the init and cleanup functions of the decoder itself. - -=LodePNG_InfoPng= - -The Decoder class stores information about the PNG image in an LodePNG_InfoPng object. With -the Encoder you can do the opposite: you give it an LodePNG_InfoPng object, and it'll try -to match the LodePNG_InfoPng you give as close as possible in the PNG it encodes. For -example in the LodePNG_InfoPng you can specify the color type you want to use, possible -tEXt chunks you want the PNG to contain, etc... For an explanation of all the -values in LodePNG_InfoPng see a further section. Not all PNG color types are supported -by the Encoder. - -Note that the encoder will only TRY to match the LodePNG_InfoPng struct you give. -Some things are ignored by the encoder. The width and height of LodePNG_InfoPng are -ignored as well, because instead the width and height of the raw image you give -in the input are used. In fact the encoder currently uses only the following -settings from it: --colorType: the ones it supports --text chunks, that you can add to the LodePNG_InfoPng with "addText" --the color key, if applicable for the given color type --the palette, if you encode to a PNG with colorType 3 --the background color: it'll add a bKGD chunk to the PNG if one is given --the interlaceMethod: None (0) or Adam7 (1) - -When encoding to a PNG with colorType 3, the encoder will generate a PLTE chunk. -If the palette contains any colors for which the alpha channel is not 255 (so -there are translucent colors in the palette), it'll add a tRNS chunk. - -=LodePNG_InfoRaw= - -You specify the color type of the raw image that you give to the input here, -including a possible transparent color key and palette you happen to be using in -your raw image data. - -By default, 32-bit color is assumed, meaning your input has to be in RGBA -format with 4 bytes (unsigned chars) per pixel. - -=Settings= - -The following settings are supported (some are in sub-structs): -*) autoLeaveOutAlphaChannel: when this option is enabled, when you specify a PNG -color type with alpha channel (not to be confused with the color type of the raw -image you specify!!), but the encoder detects that all pixels of the given image -are opaque, then it'll automatically use the corresponding type without alpha -channel, resulting in a smaller PNG image. -*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, 2 = dynamic huffman tree (best compression) -*) useLZ77: whether or not to use LZ77 for compressed block types -*) windowSize: the window size used by the LZ77 encoder (1 - 32768) -*) force_palette: if colorType is 2 or 6, you can make the encoder write a PLTE - chunk if force_palette is true. This can used as suggested palette to convert - to by viewers that don't support more than 256 colors (if those still exist) -*) add_id: add text chunk "Encoder: LodePNG <version>" to the image. -*) text_compression: default 0. If 1, it'll store texts as zTXt instead of tEXt chunks. - zTXt chunks use zlib compression on the text. This gives a smaller result on - large texts but a larger result on small texts (such as a single program name). - It's all tEXt or all zTXt though, there's no separate setting per text yet. - - -7. color conversions --------------------- - -For trickier usage of LodePNG, you need to understand about PNG color types and -about how and when LodePNG uses the settings in LodePNG_InfoPng, LodePNG_InfoRaw and Settings. - -=PNG color types= - -A PNG image can have many color types, ranging from 1-bit color to 64-bit color, -as well as palettized color modes. After the zlib decompression and unfiltering -in the PNG image is done, the raw pixel data will have that color type and thus -a certain amount of bits per pixel. If you want the output raw image after -decoding to have another color type, a conversion is done by LodePNG. - -The PNG specification mentions the following color types: - -0: greyscale, bit depths 1, 2, 4, 8, 16 -2: RGB, bit depths 8 and 16 -3: palette, bit depths 1, 2, 4 and 8 -4: greyscale with alpha, bit depths 8 and 16 -6: RGBA, bit depths 8 and 16 - -Bit depth is the amount of bits per color channel. - -=Default Behaviour of LodePNG= - -By default, the Decoder will convert the data from the PNG to 32-bit RGBA color, -no matter what color type the PNG has, so that the result can be used directly -as a texture in OpenGL etc... without worries about what color type the original -image has. - -The Encoder assumes by default that the raw input you give it is a 32-bit RGBA -buffer and will store the PNG as either 32 bit or 24 bit depending on whether -or not any translucent pixels were detected in it. - -To get the default behaviour, don't change the values of LodePNG_InfoRaw and LodePNG_InfoPng of -the encoder, and don't change the values of LodePNG_InfoRaw of the decoder. - -=Color Conversions= - -As explained in the sections about the Encoder and Decoder, you can specify -color types and bit depths in LodePNG_InfoPng and LodePNG_InfoRaw, to change the default behaviour -explained above. (for the Decoder you can only specify the LodePNG_InfoRaw, because the -LodePNG_InfoPng contains what the PNG file has). - -To avoid some confusion: --the Decoder converts from PNG to raw image --the Encoder converts from raw image to PNG --the color type and bit depth in LodePNG_InfoRaw, are those of the raw image --the color type and bit depth in LodePNG_InfoPng, are those of the PNG --if the color type of the LodePNG_InfoRaw and PNG image aren't the same, a conversion -between the color types is done if the color types are supported - -Supported color types: --It's possible to load PNGs from any colortype and to save PNGs of any colorType. --Both encoder and decoder use the same converter. So both encoder and decoder -suport the same color types at the input and the output. So the decoder supports -any type of PNG image and can convert it to certain types of raw image, while the -encoder supports any type of raw data but only certain color types for the output PNG. --The converter can convert from _any_ input color type, to 24-bit RGB or 32-bit RGBA --The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha --If both color types are the same, conversion from anything to anything is possible --Color types that are invalid according to the PNG specification are not allowed --When converting from a type with alpha channel to one without, the alpha channel information is discarded --When converting from a type without alpha channel to one with, the result will be opaque except pixels that have the same color as the color key of the input if one was given --When converting from 16-bit bitDepth to 8-bit bitDepth, the 16-bit precision information is lost, only the most significant byte is kept --Converting from color to greyscale is not supported on purpose: choosing what kind of color to greyscale conversion to do is not a decision a PNG codec should make --Converting from/to a palette type, only keeps the indices, it ignores the colors defined in the palette - -No conversion needed...: --If the color type of the PNG image and raw image are the same, then no -conversion is done, and all color types are supported. --In the encoder, you can make it save a PNG with any color by giving the -LodePNG_InfoRaw and LodePNG_InfoPng the same color type. --In the decoder, you can make it store the pixel data in the same color type -as the PNG has, by setting the color_convert setting to false. Settings in -infoRaw are then ignored. - -The function LodePNG_convert does this, which is available in the interface but -normally isn't needed since the encoder and decoder already call it. - -=More Notes= - -In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines -have a bit amount that isn't a multiple of 8, then padding bits are used so that each -scanline starts at a fresh byte. -However: The input image you give to the encoder, and the output image you get from the decoder -will NOT have these padding bits in that case, e.g. in the case of a 1-bit image with a width -of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte, -not the first bit of a new byte. - -8. info values --------------- - -Both the encoder and decoder use a variable of type LodePNG_InfoPng and LodePNG_InfoRaw, which -both also contain a LodePNG_InfoColor. Here's a list of each of the values stored in them: - -*) info from the PNG header (IHDR chunk): - -width: width of the image in pixels -height: height of the image in pixels -colorType: color type of the original PNG file -bitDepth: bits per sample -compressionMethod: compression method of the original file. Always 0. -filterMethod: filter method of the original file. Always 0. -interlaceMethod: interlace method of the original file. 0 is no interlace, 1 is adam7 interlace. - -Note: width and height are only used as information of a decoded PNG image. When encoding one, you don't have -to specify width and height in an LodePNG_Info struct, but you give them as parameters of the encode function. -The rest of the LodePNG_Info struct IS used by the encoder though! - -*) palette: - -This is a dynamically allocated unsigned char array with the colors of the palette. The value palettesize -indicates the amount of colors in the palette. The allocated size of the buffer is 4 * palettesize bytes, -because there are 4 values per color: R, G, B and A. Even if less color channels are used, the palette -is always in RGBA format, in the order RGBARGBARGBA..... - -When encoding a PNG, to store your colors in the palette of the LodePNG_InfoRaw, first use -LodePNG_InfoColor_clearPalette, then for each color use LodePNG_InfoColor_addPalette. -In the C++ version the Encoder class also has the above functions available directly in its interface. - -Note that the palette information from the tRNS chunk is also already included in this palette vector. - -If you encode an image with palette, don't forget that you have to set the alpha channels (A) of the palette -too, set them to 255 for an opaque palette. If you leave them at zero, the image will be encoded as -fully invisible. This both for the palette in the infoRaw and the infoPng if the png is to have a palette. - -*) transparent color key - -key_defined: is a transparent color key given? -key_r: red/greyscale component of color key -key_g: green component of color key -key_b: blue component of color key - -For greyscale PNGs, r, g and b will all 3 be set to the same. - -This color is 8-bit for 8-bit PNGs, 16-bit for 16-bit per channel PNGs. - -*) suggested background color - -background_defined: is a suggested background color given? -background_r: red component of sugg. background color -background_g: green component of sugg. background color -background_b: blue component of sugg. background color - -This color is 8-bit for 8-bit PNGs, 16-bit for 16-bit PNGs - -For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding -the encoder writes the red one away. -For palette PNGs: When decoding, the RGB value will be stored, no a palette -index. But when encoding, specify the index of the palette in background_r, -the other two are then ignored. - -The decoder pretty much ignores this background color, after all if you make a -PNG translucent normally you intend it to be used against any background, on -websites, as translucent textures in games, ... But you can get the color this -way if needed. - -*) text and itext - -Non-international text: - --text.keys: a char** buffer containing the keywords (see below) --text.strings: a char** buffer containing the texts (see below) --text.num: the amount of texts in the above char** buffers (there may be more texts in itext) --LodePNG_InfoText_clearText: use this to clear the texts again after you filled them in --LodePNG_InfoText_addText: this function is used to push back a keyword and text - -International text: This is stored in separate arrays! The sum text.num and itext.num is the real amount of texts. - --itext.keys: keyword in English --itext.langtags: ISO 639 letter code for the language --itext.transkeys: keyword in this language --itext.strings: the text in this language, in UTF-8 --itext.num: the amount of international texts in this PNG --LodePNG_InfoIText_clearText: use this to clear the itexts again after you filled them in --LodePNG_InfoIText_addText: this function is used to push back all 4 parts of an itext - -Don't allocate these text buffers yourself. Use the init/cleanup functions -correctly and use addText and clearText. - -In the C++ version the Encoder class also has the above functions available directly in its interface. -The char** buffers are used like the argv parameter of a main() function, and (i)text.num takes the role -of argc. - -In a text, there must be as much keys as strings because they always form pairs. In an itext, -there must always be as much keys, langtags, transkeys and strings. - -They keyword of text chunks gives a short description what the actual text -represents. There are a few standard standard keywords recognised -by many programs: Title, Author, Description, Copyright, Creation Time, -Software, Disclaimer, Warning, Source, Comment. It's allowed to use other keys. - -The keyword is minimum 1 character and maximum 79 characters long. It's -discouraged to use a single line length longer than 79 characters for texts. - -*) additional color info - -These functions are available with longer names in the C version, and directly -in the Decoder's interface in the C++ version. - -getBpp(): bits per pixel of the PNG image -getChannels(): amount of color channels of the PNG image -isGreyscaleType(): it's color type 0 or 4 -isAlphaType(): it's color type 2 or 6 - -These values are calculated out of color type and bit depth of InfoColor. - -The difference between bits per pixel and bit depth is that bit depth is the -number of bits per color channel, while a pixel can have multiple channels. - -*) pHYs chunk (image dimensions) - -phys_defined: if 0, there is no pHYs chunk and the values are undefined, if 1 else there is one -phys_x: pixels per unit in x direction -phys_y: pixels per unit in y direction -phys_unit: the unit, 0 is no unit (x and y only give the ratio), 1 is metre - -*) tIME chunk (modification time) - -time_defined: if 0, there is no tIME chunk and the values are undefined, if 1 there is one -time: this struct contains year as a 2-byte number (0-65535), month, day, hour, minute, -second as 1-byte numbers that must be in the correct range - -Note: to make the encoder add a time chunk, set time_defined to 1 and fill in -the correct values in all the time parameters, LodePNG will not fill the current -time in these values itself, all it does is copy them over into the chunk bytes. - - -9. error values ---------------- - -The meanings of the LodePNG error values: - -*) 0: no error, everything went ok -*) 1: the Encoder/Decoder has done nothing yet, so error checking makes no sense yet -*) 10: while huffman decoding: end of input memory reached without endcode -*) 11: while huffman decoding: error in code tree made it jump outside of tree -*) 13: problem while processing dynamic deflate block -*) 14: problem while processing dynamic deflate block -*) 15: problem while processing dynamic deflate block -*) 16: unexisting code while processing dynamic deflate block -*) 17: while inflating: end of out buffer memory reached -*) 18: while inflating: invalid distance code -*) 19: while inflating: end of out buffer memory reached -*) 20: invalid deflate block BTYPE encountered while decoding -*) 21: NLEN is not ones complement of LEN in a deflate block -*) 22: while inflating: end of out buffer memory reached. - This can happen if the inflated deflate data is longer than the amount of bytes required to fill up - all the pixels of the image, given the color depth and image dimensions. Something that doesn't - happen in a normal, well encoded, PNG image. -*) 23: while inflating: end of in buffer memory reached -*) 24: invalid FCHECK in zlib header -*) 25: invalid compression method in zlib header -*) 26: FDICT encountered in zlib header while it's not used for PNG -*) 27: PNG file is smaller than a PNG header -*) 28: incorrect PNG signature (the first 8 bytes of the PNG file) - Maybe it's not a PNG, or a PNG file that got corrupted so that the header indicates the corruption. -*) 29: first chunk is not the header chunk -*) 30: chunk length too large, chunk broken off at end of file -*) 31: illegal PNG color type or bpp -*) 32: illegal PNG compression method -*) 33: illegal PNG filter method -*) 34: illegal PNG interlace method -*) 35: chunk length of a chunk is too large or the chunk too small -*) 36: illegal PNG filter type encountered -*) 37: illegal bit depth for this color type given -*) 38: the palette is too big (more than 256 colors) -*) 39: more palette alpha values given in tRNS, than there are colors in the palette -*) 40: tRNS chunk has wrong size for greyscale image -*) 41: tRNS chunk has wrong size for RGB image -*) 42: tRNS chunk appeared while it was not allowed for this color type -*) 43: bKGD chunk has wrong size for palette image -*) 44: bKGD chunk has wrong size for greyscale image -*) 45: bKGD chunk has wrong size for RGB image -*) 46: value encountered in indexed image is larger than the palette size (bitdepth == 8). Is the palette too small? -*) 47: value encountered in indexed image is larger than the palette size (bitdepth < 8). Is the palette too small? -*) 48: the input data is empty. Maybe a PNG file you tried to load doesn't exist or is in the wrong path. -*) 49: jumped past memory while generating dynamic huffman tree -*) 50: jumped past memory while generating dynamic huffman tree -*) 51: jumped past memory while inflating huffman block -*) 52: jumped past memory while inflating -*) 53: size of zlib data too small -*) 55: jumped past tree while generating huffman tree, this could be when the - tree will have more leaves than symbols after generating it out of the - given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib. -*) 56: given output image colorType or bitDepth not supported for color conversion -*) 57: invalid CRC encountered (checking CRC can be disabled) -*) 58: invalid ADLER32 encountered (checking ADLER32 can be disabled) -*) 59: conversion to unexisting or unsupported color type or bit depth requested by encoder or decoder -*) 60: invalid window size given in the settings of the encoder (must be 0-32768) -*) 61: invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed) -*) 62: conversion from non-greyscale color to greyscale color requested by encoder or decoder. LodePNG - leaves the choice of RGB to greyscale conversion formula to the user. -*) 63: length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk (2^31-1) -*) 64: the length of the "end" symbol 256 in the Huffman tree is 0, resulting in the inability of a deflated - block to ever contain an end code. It must be at least 1. -*) 66: the length of a text chunk keyword given to the encoder is longer than the maximum 79 bytes. -*) 67: the length of a text chunk keyword given to the encoder is smaller than the minimum 1 byte. -*) 68: tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors -*) 69: unknown chunk type with "critical" flag encountered by the decoder -*) 71: unexisting interlace mode given to encoder (must be 0 or 1) -*) 72: while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0) -*) 73: invalid tIME chunk size -*) 74: invalid pHYs chunk size -*) 75: no null termination char found while decoding any kind of text chunk, or wrong length -*) 76: iTXt chunk too short to contain required bytes -*) 77: integer overflow in buffer size happened somewhere -*) 78: file doesn't exist or couldn't be opened for reading -*) 79: file couldn't be opened for writing -*) 80: tried creating a tree for 0 symbols -*) 9900-9999: out of memory while allocating chunk of memory somewhere - - -10. file IO ------------ - -For cases where you want to load the PNG image from a file, you can use your own -file loading code, or the file loading and saving functions provided with -LodePNG. These use the same unsigned char format used by the Decoder and Encoder. - -The loadFile function fills the given buffer up with the file from harddisk -with the given name. - -The saveFile function saves the contents of the given buffer to the file -with given name. Warning: this overwrites the contents that were previously in -the file if it already existed, without warning. - -Note that you don't have to decode a PNG image from a file, you can as well -retrieve the buffer another way in your code, because the decode function takes -a buffer as parameter, not a filename. - -Both C and C++ versions of the loadFile and saveFile functions are available. -For the C version of loadFile, you need to free() the buffer after use. The -C++ versions use std::vectors so they clean themselves automatically. - - -11. chunks and PNG editing --------------------------- - -If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG -editor that should follow the rules about handling of unknown chunks, or if you -program is able to read other types of chunks than the ones handled by LodePNG, -then that's possible with the chunk functions of LodePNG. - -A PNG chunk has the following layout: - -4 bytes length -4 bytes type name -length bytes data -4 bytes CRC - - -11.1 iterating through chunks ------------------------------ - -If you have a buffer containing the PNG image data, then the first chunk (the -IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the -signature of the PNG and are not part of a chunk. But if you start at byte 8 -then you have a chunk, and can check the following things of it. - -NOTE: none of these functions check for memory buffer boundaries. To avoid -exploits, always make sure the buffer contains all the data of the chunks. -When using LodePNG_chunk_next, make sure the returned value is within the -allocated memory. - -unsigned LodePNG_chunk_length(const unsigned char* chunk): - -Get the length of the chunk's data. The total chunk length is this length + 12. - -void LodePNG_chunk_type(char type[5], const unsigned char* chunk): -unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type): - -Get the type of the chunk or compare if it's a certain type - -unsigned char LodePNG_chunk_critical(const unsigned char* chunk): -unsigned char LodePNG_chunk_private(const unsigned char* chunk): -unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk): - -Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). -Check if the chunk is private (public chunks are part of the standard, private ones not). -Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical -chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your -program doesn't handle that type of unknown chunk. - -unsigned char* LodePNG_chunk_data(unsigned char* chunk): -const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk): - -Get a pointer to the start of the data of the chunk. - -unsigned LodePNG_chunk_check_crc(const unsigned char* chunk): -void LodePNG_chunk_generate_crc(unsigned char* chunk): - -Check if the crc is correct or generate a correct one. - -unsigned char* LodePNG_chunk_next(unsigned char* chunk): -const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk): - -Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these -functions do no boundary checking of the allocated data whatsoever, so make sure there is enough -data available in the buffer to be able to go to the next chunk. - -unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk): -unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length, const char* type, const unsigned char* data): - -These functions are used to create new chunks that are appended to the data in *out that has -length *outlength. The append function appends an existing chunk to the new data. The create -function creates a new chunk with the given parameters and appends it. Type is the 4-letter -name of the chunk. - - -11.2 chunks in infoPng ----------------------- - -The LodePNG_InfoPng struct contains a struct LodePNG_UnknownChunks in it. This -struct has 3 buffers (each with size) to contain 3 types of unknown chunks: -the ones that come before the PLTE chunk, the ones that come between the PLTE -and the IDAT chunks, and the ones that come after the IDAT chunks. -It's necessary to make the distionction between these 3 cases because the PNG -standard forces to keep the ordering of unknown chunks compared to the critical -chunks, but does not force any other ordering rules. - -infoPng.unknown_chunks.data[0] is the chunks before PLTE -infoPng.unknown_chunks.data[1] is the chunks after PLTE, before IDAT -infoPng.unknown_chunks.data[2] is the chunks after IDAT - -The chunks in these 3 buffers can be iterated through and read by using the same -way described in the previous subchapter. - -When using the decoder to decode a PNG, you can make it store all unknown chunks -if you set the option settings.rememberUnknownChunks to 1. By default, this option -is off and is 0. - -The encoder will always encode unknown chunks that are stored in the infoPng. If -you need it to add a particular chunk that isn't known by LodePNG, you can use -LodePNG_append_chunk or LodePNG_create_chunk to the chunk data in -infoPng.unknown_chunks.data[x]. - -Chunks that are known by LodePNG should not be added in that way. E.g. to make -LodePNG add a bKGD chunk, set background_defined to true and add the correct -parameters there and LodePNG will generate the chunk. - - -12. compiler support --------------------- - -No libraries other than the current standard C library are needed to compile -LodePNG. For the C++ version, only the standard C++ library is needed on top. -Add the files lodepng.c(pp) and lodepng.h to your project, include -lodepng.h where needed, and your program can read/write PNG files. - -Use optimization! For both the encoder and decoder, compiling with the best -optimizations makes a large difference. - -Make sure that LodePNG is compiled with the same compiler of the same version -and with the same settings as the rest of the program, or the interfaces with -std::vectors and std::strings in C++ can be incompatible resulting in bad things. - -CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. - -*) gcc and g++ - -LodePNG is developed in gcc so this compiler is natively supported. It gives no -warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ -version 4.2.2 on Linux. - -*) Mingw and Bloodshed DevC++ - -The Mingw compiler (a port of gcc) used by Bloodshed DevC++ for Windows is fully -supported by LodePNG. - -*) Visual Studio 2005 and Visual C++ 2005 Express Edition - -Versions 20070604 up to 20080107 have been tested on VS2005 and work. There are no -warnings, except two warnings about 'fopen' being deprecated. 'fopen' is a function -required by the C standard, so this warning is the fault of VS2005, it's nice of -them to enforce secure code, however the multiplatform LodePNG can't follow their -non-standard extensions. LodePNG is fully ISO C90 compliant. - -If you're using LodePNG in VS2005 and don't want to see the deprecated warnings, -put this on top of lodepng.h before the inclusions: #define _CRT_SECURE_NO_DEPRECATE - -*) Visual Studio 6.0 - -The C++ version of LodePNG was not supported by Visual Studio 6.0 because Visual -Studio 6.0 doesn't follow the C++ standard and implements it incorrectly. -The current C version of LodePNG has not been tested in VS6 but may work now. - -*) Comeau C/C++ - -Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive -at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode. - -*) Compilers on Macintosh - -I'd love to support Macintosh but don't have one available to test it on. -If it doesn't work with your compiler, maybe it can be gotten to work with the -gcc compiler for Macintosh. Someone reported that it doesn't work well at all -for Macintosh. All information on attempts to get it to work on Mac is welcome. - -*) Other Compilers - -If you encounter problems on other compilers, I'm happy to help out make LodePNG -support the compiler if it supports the ISO C90 and C++ standard well enough. If -the required modification to support the compiler requires using non standard or -lesser C/C++ code or headers, I won't support it. - - -13. examples ------------- - -This decoder and encoder example show the most basic usage of LodePNG (using the -classes, not the simple functions, which would be trivial) - -More complex examples can be found in: --lodepng_examples.c: 9 different examples in C, such as showing the image with SDL, ... --lodepng_examples.cpp: the exact same examples in C++ using the C++ wrapper of LodePNG - - -13.1. decoder C++ example -------------------------- - -//////////////////////////////////////////////////////////////////////////////// -#include "coding/lodepng.h" -#include <iostream> - -int main(int argc, char *argv[]) -{ - const char* filename = argc > 1 ? argv[1] : "test.png"; - - //load and decode - std::vector<unsigned char> buffer, image; - LodePNG::loadFile(buffer, filename); //load the image file with given filename - LodePNG::Decoder decoder; - decoder.decode(image, buffer.size() ? &buffer[0] : 0, (unsigned)buffer.size()); //decode the png - - //if there's an error, display it - if(decoder.hasError()) std::cout << "error: " << decoder.getError() << std::endl; - - //the pixels are now in the vector "image", use it as texture, draw it, ... -} - -//alternative version using the "simple" function -int main(int argc, char *argv[]) -{ - const char* filename = argc > 1 ? argv[1] : "test.png"; - - //load and decode - std::vector<unsigned char> image; - unsigned w, h; - unsigned error = LodePNG::decode(image, w, h, filename); - - //if there's an error, display it - if(error != 0) std::cout << "error: " << error << std::endl; - - //the pixels are now in the vector "image", use it as texture, draw it, ... -} -//////////////////////////////////////////////////////////////////////////////// - - -13.2 encoder C++ example ------------------------- - -//////////////////////////////////////////////////////////////////////////////// -#include "coding/lodepng.h" -#include <iostream> - -int main(int argc, char *argv[]) -{ - //check if user gave a filename - if(argc <= 1) - { - std::cout << "please provide a filename to save to\n"; - return 0; - } - - //generate some image - std::vector<unsigned char> image; - image.resize(512 * 512 * 4); - for(unsigned y = 0; y < 512; y++) - for(unsigned x = 0; x < 512; x++) - { - image[4 * 512 * y + 4 * x + 0] = 255 * !(x & y); - image[4 * 512 * y + 4 * x + 1] = x ^ y; - image[4 * 512 * y + 4 * x + 2] = x | y; - image[4 * 512 * y + 4 * x + 3] = 255; - } - - //encode and save - std::vector<unsigned char> buffer; - LodePNG::Encoder encoder; - encoder.encode(buffer, image, 512, 512); - LodePNG::saveFile(buffer, argv[1]); - - //the same as the 4 lines of code above, but in 1 call: - //LodePNG::encode(argv[1], image, 512, 512); -} -//////////////////////////////////////////////////////////////////////////////// - - -13.3 Decoder C example ----------------------- - -This example loads the PNG in 1 function call - -#include "coding/lodepng.h" - -int main(int argc, char *argv[]) -{ - unsigned error; - unsigned char* image; - size_t w, h; - - if(argc <= 1) return 0; - - error = LodePNG_decode3(&image, &w, &h, filename); - - free(image); -} - - -14. LodeZlib ------------- - -Also available in the interface is LodeZlib. Both C and C++ versions of these -functions are available. The interface is similar to that of the "simple" PNG -encoding and decoding functions. - -LodeZlib can be used to zlib compress and decompress a buffer. It cannot be -used to create gzip files however. Also, it only supports the part of zlib -that is required for PNG, it does not support compression and decompression -with dictionaries. - - -15. changes ------------ - -The version number of LodePNG is the date of the change given in the format -yyyymmdd. - -Some changes aren't backwards compatible. Those are indicated with a (!) -symbol. - -*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers. -*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could - read by ignoring the problem but windows apps couldn't. -*) 06 jun 2008: added more error checks for out of memory cases. -*) 26 apr 2008: added a few more checks here and there to ensure more safety. -*) 06 mar 2008: crash with encoding of strings fixed -*) 02 feb 2008: support for international text chunks added (iTXt) -*) 23 jan 2008: small cleanups, and #defines to divide code in sections -*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. -*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. -*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added - Also vareous fixes, such as in the deflate and the padding bits code. -*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved - filtering code of encoder. -*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A - C++ wrapper around this provides an interface almost identical to before. - Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code - are together in these files but it works both for C and C++ compilers. -*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks -*) 30 aug 2007: bug fixed which makes this Borland C++ compatible -*) 09 aug 2007: some VS2005 warnings removed again -*) 21 jul 2007: deflate code placed in new namespace separate from zlib code -*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images -*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing - invalid std::vector element [0] fixed, and level 3 and 4 warnings removed -*) 02 jun 2007: made the encoder add a tag with version by default -*) 27 may 2007: zlib and png code separated (but still in the same file), - simple encoder/decoder functions added for more simple usage cases -*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), - moved some examples from here to lodepng_examples.cpp -*) 12 may 2007: palette decoding bug fixed -*) 24 apr 2007: changed the license from BSD to the zlib license -*) 11 mar 2007: very simple addition: ability to encode bKGD chunks. -*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding - palettized PNG images. Plus little interface change with palette and texts. -*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. - Fixed a bug where the end code of a block had length 0 in the Huffman tree. -*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented - and supported by the encoder, resulting in smaller PNGs at the output. -*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. -*) 24 jan 2007: gave encoder an error interface. Added color conversion from any - greyscale type to 8-bit greyscale with or without alpha. -*) 21 jan 2007: (!) Totally changed the interface. It allows more color types - to convert to and is more uniform. See the manual for how it works now. -*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: - encode/decode custom tEXt chunks, separate classes for zlib & deflate, and - at last made the decoder give errors for incorrect Adler32 or Crc. -*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. -*) 29 dec 2006: Added support for encoding images without alpha channel, and - cleaned out code as well as making certain parts faster. -*) 28 dec 2006: Added "Settings" to the encoder. -*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. - Removed some code duplication in the decoder. Fixed little bug in an example. -*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. - Fixed a bug of the decoder with 16-bit per color. -*) 15 okt 2006: Changed documentation structure -*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the - given image buffer, however for now it's not compressed. -*) 08 sep 2006: (!) Changed to interface with a Decoder class -*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different - way. Renamed decodePNG to decodePNGGeneric. -*) 29 jul 2006: (!) Changed the interface: image info is now returned as a - struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. -*) 28 jul 2006: Cleaned the code and added new error checks. - Corrected terminology "deflate" into "inflate". -*) 23 jun 2006: Added SDL example in the documentation in the header, this - example allows easy debugging by displaying the PNG and its transparency. -*) 22 jun 2006: (!) Changed way to obtain error value. Added - loadFile function for convenience. Made decodePNG32 faster. -*) 21 jun 2006: (!) Changed type of info vector to unsigned. - Changed position of palette in info vector. Fixed an important bug that - happened on PNGs with an uncompressed block. -*) 16 jun 2006: Internally changed unsigned into unsigned where - needed, and performed some optimizations. -*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them - in LodePNG namespace. Changed the order of the parameters. Rewrote the - documentation in the header. Renamed files to lodepng.cpp and lodepng.h -*) 22 apr 2006: Optimized and improved some code -*) 07 sep 2005: (!) Changed to std::vector interface -*) 12 aug 2005: Initial release - - -16. contact information ------------------------ - -Feel free to contact me with suggestions, problems, comments, ... concerning -LodePNG. If you encounter a PNG image that doesn't work properly with this -decoder, feel free to send it and I'll use it to find and fix the problem. - -My email address is (puzzle the account and domain together with an @ symbol): -Domain: gmail dot com. -Account: lode dot vandevenne. - - -Copyright (c) 2005-2008 Lode Vandevenne -*/ diff --git a/3party/lodepng/lodepng_io.hpp b/3party/lodepng/lodepng_io.hpp deleted file mode 100644 index 23b7787e70..0000000000 --- a/3party/lodepng/lodepng_io.hpp +++ /dev/null @@ -1,211 +0,0 @@ -/* - Copyright 2005-2007 Adobe Systems Incorporated - - Use, modification and distribution are subject to the Boost Software License, - Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at - http://www.boost.org/LICENSE_1_0.txt). - - See http://opensource.adobe.com/gil for most recent version including documentation. -*/ - -/*************************************************************************************************/ - -#ifndef GIL_LODEPNG_IO_H -#define GIL_LODEPNG_IO_H - -/// \file -/// \brief Support for reading and writing PNG files -/// using LodePNG -// -// We are currently providing the following functions: -// point2<std::ptrdiff_t> lodepng_read_dimensions(const char*) -// template <typename View> void lodepng_read_view(const char*,const View&) -// template <typename View> void lodepng_read_image(const char*,image<View>&) -// template <typename View> void lodepng_write_view(const char*,const View&) -// template <typename View> struct lodepng_read_support; -// template <typename View> struct lodepng_write_support; -// -/// \author Rachytski Siarhei -/// \date 2010 \n Last updated June 20, 2010 - -#include <stdio.h> -#include <string> -#include <boost/static_assert.hpp> -#include <boost/gil/gil_config.hpp> -#include <boost/gil/utilities.hpp> -#include <boost/gil/extension/io/io_error.hpp> -#include "lodepng_io_private.hpp" - -namespace boost { namespace gil { - -/// \ingroup LODEPNG_IO -/// \brief Returns the width and height of the PNG file at the specified location. -/// Throws std::ios_base::failure if the location does not correspond to a valid PNG file -inline point2<std::ptrdiff_t> lodepng_read_dimensions(ReaderPtr<Reader> & reader) { - detail::lodepng_reader m(reader); - return m.get_dimensions(); -} - -/// \ingroup LODEPNG_IO -/// \brief Returns the width and height of the PNG file at the specified location. -/// Throws std::ios_base::failure if the location does not correspond to a valid PNG file -//inline point2<std::ptrdiff_t> lodepng_read_dimensions(ReaderPtr<Reader> & reader) { -// return lodepng_read_dimensions(reader); -//} - -/// \ingroup LODEPNG_IO -/// \brief Determines whether the given view type is supported for reading -template <typename View> -struct lodepng_read_support { - BOOST_STATIC_CONSTANT(bool,is_supported= - (detail::lodepng_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::is_supported)); - BOOST_STATIC_CONSTANT(int,bit_depth= - (detail::lodepng_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::bit_depth)); - BOOST_STATIC_CONSTANT(int,color_type= - (detail::lodepng_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::color_type)); - BOOST_STATIC_CONSTANT(bool, value=is_supported); -}; - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name into the given view. -/// Triggers a compile assert if the view color space and channel depth are not supported by the PNG library or by the I/O extension. -/// Throws std::ios_base::failure if the file is not a valid PNG file, or if its color space or channel depth are not -/// compatible with the ones specified by View, or if its dimensions don't match the ones of the view. -template <typename View> -inline void lodepng_read_view(ReaderPtr<Reader> & reader, const View& view) { - BOOST_STATIC_ASSERT(lodepng_read_support<View>::is_supported); - detail::lodepng_reader m(reader); - m.apply(view); -} - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name into the given view. -template <typename View> -inline void lodepng_read_view(const std::string& filename,const View& view) { - lodepng_read_view(filename.c_str(),view); -} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, and loads the pixels into it. -/// Triggers a compile assert if the image color space or channel depth are not supported by the PNG library or by the I/O extension. -/// Throws std::ios_base::failure if the file is not a valid PNG file, or if its color space or channel depth are not -/// compatible with the ones specified by Image -template <typename Image> -inline void lodepng_read_image(ReaderPtr<Reader> & reader, Image& im) { - BOOST_STATIC_ASSERT(lodepng_read_support<typename Image::view_t>::is_supported); - detail::lodepng_reader m(reader); - m.read_image(im); -} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, and loads the pixels into it. -template <typename Image> -inline void lodepng_read_image(const std::string& filename,Image& im) { - lodepng_read_image(filename.c_str(),im); -} - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name and color-converts it into the given view. -/// Throws std::ios_base::failure if the file is not a valid PNG file, or if its dimensions don't match the ones of the view. -template <typename View,typename CC> -inline void lodepng_read_and_convert_view(const char* filename,const View& view,CC cc) { - detail::lodepng_reader_color_convert<CC> m(filename,cc); - m.apply(view); -} - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name and color-converts it into the given view. -/// Throws std::ios_base::failure if the file is not a valid PNG file, or if its dimensions don't match the ones of the view. -template <typename View> -inline void lodepng_read_and_convert_view(ReaderPtr<Reader> & reader,const View& view) { - detail::lodepng_reader_color_convert<default_color_converter> m(reader,default_color_converter()); - m.apply(view); -} - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name and color-converts it into the given view. -template <typename View,typename CC> -inline void lodepng_read_and_convert_view(ReaderPtr<Reader> & reader,const View& view,CC cc) { - detail::lodepng_reader_color_convert<CC> m(reader, cc); - m.apply(view); -} - -/// \ingroup LODEPNG_IO -/// \brief Loads the image specified by the given png image file name and color-converts it into the given view. -//template <typename View> -//inline void lodepng_read_and_convert_view(ReaderPtr<Reader> & reader,const View& view) { -// lodepng_read_and_convert_view(reader,view); -//} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, loads and color-converts the pixels into it. -/// Throws std::ios_base::failure if the file is not a valid PNG file -template <typename Image,typename CC> -inline void lodepng_read_and_convert_image(ReaderPtr<Reader> & reader,Image& im,CC cc) { - detail::lodepng_reader_color_convert<CC> m(reader,cc); - m.read_image(im); -} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, loads and color-converts the pixels into it. -/// Throws std::ios_base::failure if the file is not a valid PNG file -template <typename Image> -inline void lodepng_read_and_convert_image(ReaderPtr<Reader> & reader, Image& im) { - detail::lodepng_reader_color_convert<default_color_converter> m(reader, default_color_converter()); - m.read_image(im); -} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, loads and color-converts the pixels into it. -template <typename Image,typename CC> -inline void lodepng_read_and_convert_image(const std::string& filename,Image& im,CC cc) { - lodepng_read_and_convert_image(filename.c_str(),im,cc); -} - -/// \ingroup LODEPNG_IO -/// \brief Allocates a new image whose dimensions are determined by the given png image file, loads and color-converts the pixels into it. -template <typename Image> -inline void lodepng_read_and_convert_image(const std::string& filename,Image& im) { - lodepng_read_and_convert_image(filename.c_str(),im); -} - -/// \ingroup LODEPNG_IO -/// \brief Determines whether the given view type is supported for writing -template <typename View> -struct lodepng_write_support { - BOOST_STATIC_CONSTANT(bool,is_supported= - (detail::lodepng_write_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::is_supported)); - BOOST_STATIC_CONSTANT(int,bit_depth= - (detail::lodepng_write_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::bit_depth)); - BOOST_STATIC_CONSTANT(int,color_type= - (detail::lodepng_write_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::color_type)); - BOOST_STATIC_CONSTANT(bool, value=is_supported); -}; - -/// \ingroup LODEPNG_IO -/// \brief Saves the view to a png file specified by the given png image file name. -/// Triggers a compile assert if the view color space and channel depth are not supported by the PNG library or by the I/O extension. -/// Throws std::ios_base::failure if it fails to create the file. -template <typename View> -inline void lodepng_write_view(WriterPtr<Writer> & writer,const View& view) { - BOOST_STATIC_ASSERT(lodepng_write_support<View>::is_supported); - detail::lodepng_writer m(writer); - m.apply(view); -} - -/// \ingroup LODEPNG_IO -/// \brief Saves the view to a png file specified by the given png image file name. -/*template <typename View> -inline void lodepng_write_view(const std::string& filename,const View& view) { - lodepng_write_view(filename.c_str(),view); -}*/ - -} } // namespace boost::gil - -#endif diff --git a/3party/lodepng/lodepng_io_private.hpp b/3party/lodepng/lodepng_io_private.hpp deleted file mode 100644 index 309c9656f2..0000000000 --- a/3party/lodepng/lodepng_io_private.hpp +++ /dev/null @@ -1,439 +0,0 @@ -/* - Copyright 2005-2007 Adobe Systems Incorporated - - Use, modification and distribution are subject to the Boost Software License, - Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at - http://www.boost.org/LICENSE_1_0.txt). - - See http://stlab.adobe.com/gil for most recent version including documentation. -*/ -/*************************************************************************************************/ - -#ifndef GIL_LODEPNG_IO_PRIVATE_H -#define GIL_LODEPNG_IO_PRIVATE_H - -/// \file -/// \brief Internal support for reading and writing PNG files -/// \author Hailin Jin and Lubomir Bourdev \n -/// Adobe Systems Incorporated -/// \date 2005-2007 \n Last updated August 14, 2007 - -#include <algorithm> -#include <vector> -#include <boost/static_assert.hpp> -#include <boost/gil/gil_all.hpp> -#include <boost/gil/extension/io/io_error.hpp> -#include "lodepng.hpp" - -namespace boost { namespace gil { - -namespace detail { - -static const std::size_t LODEPNG_BYTES_TO_CHECK = 4; - -static const int LODEPNG_COLOR_MASK_PALETTE = 1; -static const int LODEPNG_COLOR_MASK_COLOR = 2; -static const int LODEPNG_COLOR_MASK_ALPHA = 4; -static const int LODEPNG_COLOR_TYPE_GRAY = 0; -static const int LODEPNG_COLOR_TYPE_PALETTE = (LODEPNG_COLOR_MASK_COLOR | LODEPNG_COLOR_MASK_PALETTE); -static const int LODEPNG_COLOR_TYPE_RGB = (LODEPNG_COLOR_MASK_COLOR); -static const int LODEPNG_COLOR_TYPE_RGB_ALPHA = (LODEPNG_COLOR_MASK_COLOR | LODEPNG_COLOR_MASK_ALPHA); -static const int LODEPNG_COLOR_TYPE_GRAY_ALPHA = (LODEPNG_COLOR_MASK_ALPHA); -static const int LODEPNG_COLOR_TYPE_RGBA = LODEPNG_COLOR_TYPE_RGB_ALPHA; -static const int LODEPNG_COLOR_TYPE_GA = LODEPNG_COLOR_TYPE_GRAY_ALPHA; - - -// lbourdev: These can be greatly simplified, for example: -template <typename Cs> struct lodepng_color_type {BOOST_STATIC_CONSTANT(int,color_type=0);}; -template<> struct lodepng_color_type<gray_t> { BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_GRAY); }; -template<> struct lodepng_color_type<rgb_t> { BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGB); }; -template<> struct lodepng_color_type<rgba_t> { BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGBA); }; - -template <typename Channel,typename ColorSpace> struct lodepng_is_supported {BOOST_STATIC_CONSTANT(bool,value=false);}; -template <> struct lodepng_is_supported<bits8,gray_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; -template <> struct lodepng_is_supported<bits8,rgb_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; -template <> struct lodepng_is_supported<bits8,rgba_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; -template <> struct lodepng_is_supported<bits16,gray_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; -template <> struct lodepng_is_supported<bits16,rgb_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; -template <> struct lodepng_is_supported<bits16,rgba_t> {BOOST_STATIC_CONSTANT(bool,value=true);}; - -template <typename Channel> struct lodepng_bit_depth {BOOST_STATIC_CONSTANT(int,bit_depth=sizeof(Channel)*8);}; - -template <typename Channel,typename ColorSpace> -struct lodepng_read_support_private { - BOOST_STATIC_CONSTANT(bool,is_supported=false); - BOOST_STATIC_CONSTANT(int,bit_depth=0); - BOOST_STATIC_CONSTANT(int,color_type=0); -}; -template <> -struct lodepng_read_support_private<bits8,gray_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_GRAY); -}; -template <> -struct lodepng_read_support_private<bits8,rgb_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGB); -}; -template <> -struct lodepng_read_support_private<bits8,rgba_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGBA); -}; -template <> -struct lodepng_read_support_private<bits16,gray_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_GRAY); -}; -template <> -struct lodepng_read_support_private<bits16,rgb_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGB); -}; -template <> -struct lodepng_read_support_private<bits16,rgba_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGBA); -}; - -template <typename Channel,typename ColorSpace> -struct lodepng_write_support_private { - BOOST_STATIC_CONSTANT(bool,is_supported=false); - BOOST_STATIC_CONSTANT(int,bit_depth=0); - BOOST_STATIC_CONSTANT(int,color_type=0); -}; -template <> -struct lodepng_write_support_private<bits8,gray_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_GRAY); -}; -template <> -struct lodepng_write_support_private<bits8,rgb_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGB); -}; -template <> -struct lodepng_write_support_private<bits8,rgba_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=8); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGBA); -}; -template <> -struct lodepng_write_support_private<bits16,gray_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_GRAY); -}; -template <> -struct lodepng_write_support_private<bits16,rgb_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGB); -}; -template <> -struct lodepng_write_support_private<bits16,rgba_t> { - BOOST_STATIC_CONSTANT(bool,is_supported=true); - BOOST_STATIC_CONSTANT(int,bit_depth=16); - BOOST_STATIC_CONSTANT(int,color_type=LODEPNG_COLOR_TYPE_RGBA); -}; - -class lodepng_reader { -protected: - - LodePNG::Decoder m_decoder; - ReaderPtr<Reader> & m_reader; - - int sig_cmp(unsigned char * sig, size_t start, size_t num_to_check) - { - unsigned char png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; - if (num_to_check > 8) - num_to_check = 8; - else if (num_to_check < 1) - return (-1); - - if (start > 7) - return (-1); - - if (start + num_to_check > 8) - num_to_check = 8 - start; - - for (size_t i = 0; i < num_to_check; ++i) - if (sig[i] != png_sig[i]) - return -1; - - return 0; - } - - void init() - { - // 29 bytes are required to read: 8-bytes PNG magic, 4-bytes - // chunk length, 4-bytes chunk type, 4-bytes width, 4-bytes - // height, 1-byte bit depth, 1-byte color type, 1-byte - // compression type, 1-byte filter type and 1-byte interlace - // type. - // - // 4 more bytes are needed if CRC32 sum should be checked. - size_t const kMinSize = 29; - size_t const kMaxSize = kMinSize + 4; - - unsigned char buf[kMaxSize]; - size_t const size = m_decoder.settings.ignoreCrc ? kMinSize : kMaxSize; - m_reader.Read(0, buf, size); - // io_error_if(fread(buf, 1, 30, get()) != 30, - // "lodepng_check_validity: fail to read file"); - m_decoder.inspect(buf, size); - } - -public: - - lodepng_reader(ReaderPtr<Reader> & reader) : m_reader(reader) { init(); } - - point2<std::ptrdiff_t> get_dimensions() { - return point2<std::ptrdiff_t>(m_decoder.getWidth(), m_decoder.getHeight()); - } - - template <typename View> - void apply(const View& view) - { - io_error_if((view.width() != m_decoder.getWidth() || view.height() != m_decoder.getHeight()), - "lodepng_read_view: input view size does not match PNG file size"); - - int bitDepth = lodepng_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::bit_depth; - if (bitDepth != m_decoder.getBpp() / m_decoder.getChannels()) - io_error("lodepng_read_view: input view type is incompatible with the image type(bitDepth mismatch)"); - - int colorType = lodepng_read_support_private<typename channel_type<View>::type, - typename color_space_type<View>::type>::color_type; - if (colorType != m_decoder.getInfoPng().color.colorType) - io_error("lodepng_read_view: input view type is incompatible with the image type(colorType mismatch)"); - - std::vector<unsigned char> inputData; - LodePNG::loadFile(inputData, m_reader); - - std::vector<unsigned char> decodedData; - m_decoder.decode(decodedData, inputData); - - if (m_decoder.hasError()) - { - std::stringstream out; - out << "lodepng_read_view: " << m_decoder.getError(); - io_error(out.str().c_str()); - } - - gil::rgba8_view_t srcView = gil::interleaved_view( - view.width(), - view.height(), - gil::rgba8_ptr_t(&decodedData[0]), - 4 * view.width()); - - gil::copy_pixels(srcView, view); - } - - template <typename Image> - void read_image(Image& im) { - im.recreate(get_dimensions()); - apply(view(im)); - } -}; - -// This code will be simplified... -template <typename CC> -class lodepng_reader_color_convert : public lodepng_reader { -private: - CC _cc; -public: - lodepng_reader_color_convert(ReaderPtr<Reader> & reader, CC cc_in) : lodepng_reader(reader),_cc(cc_in) {} - lodepng_reader_color_convert(ReaderPtr<Reader> & reader) : lodepng_reader(reader) {} - template <typename View> - void apply(const View& view) - { - io_error_if((static_cast<unsigned>(view.width()) != m_decoder.getWidth() - || static_cast<unsigned>(view.height()) != m_decoder.getHeight()), - "lodepng_read_view: input view size does not match PNG file size"); - - std::vector<unsigned char> inputData; - LodePNG::loadFile(inputData, m_reader); - - std::vector<unsigned char> decodedData; - m_decoder.decode(decodedData, inputData); - - if (m_decoder.hasError()) - { - std::stringstream out; - out << "lodepng_read_view: " << m_decoder.getError(); - io_error(out.str().c_str()); - } - - int bitDepth = m_decoder.getBpp() / m_decoder.getChannels(); - int colorType = m_decoder.getInfoPng().color.colorType; - - switch (colorType) - { - case LODEPNG_COLOR_TYPE_GRAY: - switch (bitDepth) - { - case 8: - { - gil::gray8_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::gray8_ptr_t(&decodedData[0]), - sizeof(gil::gray8_pixel_t) * view.width() - ); - - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - case 16: - { - gil::gray8_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::gray8_ptr_t(&decodedData[0]), - sizeof(gil::gray8_pixel_t) * view.width() - ); - - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - default: - io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth"); - } - break; - case LODEPNG_COLOR_TYPE_RGB: - switch (bitDepth) - { - case 8: - { - gil::rgb8_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::rgb8_ptr_t(&decodedData[0]), - sizeof(gil::rgb8_pixel_t) * view.width() - ); - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - case 16: - { - gil::rgb16_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::rgb16_ptr_t(&decodedData[0]), - sizeof(gil::rgba16_pixel_t) * view.width() - ); - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - default: - io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth"); - } - break; - case LODEPNG_COLOR_TYPE_RGBA: - switch (bitDepth) - { - case 8: - { - gil::rgba8_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::rgba8_ptr_t(&decodedData[0]), - sizeof(gil::rgba8_pixel_t) * m_decoder.getWidth() - ); - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - case 16: - { - gil::rgba16_view_t srcView = gil::interleaved_view( - m_decoder.getWidth(), - m_decoder.getHeight(), - gil::rgba16_ptr_t(&decodedData[0]), - sizeof(gil::rgba16_pixel_t) * m_decoder.getWidth() - ); - gil::copy_and_convert_pixels(srcView, view, _cc); - break; - } - default: - io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth"); - } - break; - default: - io_error("png_reader_color_convert::apply(): unknown color type"); - } - } - - template <typename Image> - void read_image(Image& im) { - im.recreate(get_dimensions()); - apply(view(im)); - } -}; - - -class lodepng_writer /*: public file_mgr */{ -protected: - - LodePNG::Encoder m_encoder; - WriterPtr<Writer> & m_writer; - - void init() {} - -public: - lodepng_writer(WriterPtr<Writer> & writer) : /*file_mgr(filename, "wb"), m_fileName(filename)*/ m_writer(writer) { init(); } - - template <typename View> - void apply(const View& view) - { - typedef lodepng_write_support_private< - typename channel_type<View>::type, - typename color_space_type<View>::type - > write_support_t; - - /// Create temporary image with base color_space_type. - - LodePNG_InfoRaw infoRaw = m_encoder.getInfoRaw(); - LodePNG_InfoPng infoPng = m_encoder.getInfoPng(); - - infoRaw.color.bitDepth = write_support_t::bit_depth; - infoRaw.color.colorType = write_support_t::color_type; - - m_encoder.setInfoRaw(infoRaw); - - infoPng.compressionMethod = 0; - infoPng.filterMethod = 0; - infoPng.interlaceMethod = 0; - infoPng.height = view.height(); - infoPng.width = view.width(); - infoPng.color.bitDepth = write_support_t::bit_depth; - infoPng.color.colorType = write_support_t::color_type; - - m_encoder.setInfoPng(infoPng); - - std::vector<unsigned char> buffer; - - /// in original code there was some tricks with byte indiannes. - m_encoder.encode( - buffer, - (unsigned char *)&view(0, 0), - view.width(), - view.height() - ); - - LodePNG::saveFile(buffer, m_writer); - } -}; - -} // namespace detail -} } // namespace boost::gil - -#endif diff --git a/3party/sdf_image/CMakeLists.txt b/3party/sdf_image/CMakeLists.txt new file mode 100644 index 0000000000..ae4615d56e --- /dev/null +++ b/3party/sdf_image/CMakeLists.txt @@ -0,0 +1,9 @@ +project(sdf_image) + +set( + SRC + sdf_image.cpp + sdf_image.h +) + +add_library(${PROJECT_NAME} ${SRC}) diff --git a/3party/sdf_image/sdf_image.pro b/3party/sdf_image/sdf_image.pro new file mode 100644 index 0000000000..15f2e8fdfa --- /dev/null +++ b/3party/sdf_image/sdf_image.pro @@ -0,0 +1,12 @@ +TARGET = sdf_image +ROOT_DIR = ../.. +include($$ROOT_DIR/common.pri) + +TEMPLATE = lib +CONFIG += staticlib + +SOURCES += \ + sdf_image.cpp \ + +HEADERS += \ + sdf_image.h \ diff --git a/3party/stb_image/CMakeLists.txt b/3party/stb_image/CMakeLists.txt new file mode 100644 index 0000000000..4f78357e15 --- /dev/null +++ b/3party/stb_image/CMakeLists.txt @@ -0,0 +1,9 @@ +project(stb_image) + +set( + SRC + stb_image.cpp + stb_image.h +) + +add_library(${PROJECT_NAME} ${SRC}) diff --git a/3party/stb_image/stb_image.c b/3party/stb_image/stb_image.c deleted file mode 100644 index 13b1fcb103..0000000000 --- a/3party/stb_image/stb_image.c +++ /dev/null @@ -1,3537 +0,0 @@ -/* stbi-1.14 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c - when you control the images you're loading - - QUICK NOTES: - Primarily of interest to game developers and other people who can - avoid problematic images and only need the trivial interface - - JPEG baseline (no JPEG progressive, no oddball channel decimations) - PNG non-interlaced - BMP non-1bpp, non-RLE - TGA (not sure what subset, if a subset) - PSD (composited view only, no extra channels) - HDR (radiance rgbE format) - writes BMP,TGA (define STBI_NO_WRITE to remove code) - decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) - supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) - - TODO: - stbi_info_* - - history: - 1.14 fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including) - 1.13 threadsafe - 1.12 const qualifiers in the API - 1.11 Support installable IDCT, colorspace conversion routines - 1.10 Fixes for 64-bit (don't use "unsigned long") - optimized upsampling by Fabian "ryg" Giesen - 1.09 Fix format-conversion for PSD code (bad global variables!) - 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz - 1.07 attempt to fix C++ warning/errors again - 1.06 attempt to fix C++ warning/errors again - 1.05 fix TGA loading to return correct *comp and use good luminance calc - 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free - 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR - 1.02 support for (subset of) HDR files, float interface for preferred access to them - 1.01 fix bug: possible bug in handling right-side up bmps... not sure - fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less - than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant -*/ - -#include "stb_image.h" - -#ifndef STBI_HEADER_FILE_ONLY - -#ifndef STBI_NO_HDR -#include <math.h> // ldexp -#include <string.h> // strcmp -#endif - -#ifndef STBI_NO_STDIO -#include <stdio.h> -#endif -#include <stdlib.h> -#include <memory.h> -#include <assert.h> -#include <stdarg.h> - -#ifndef _MSC_VER - #ifdef __cplusplus - #define __forceinline inline - #else - #define __forceinline - #endif -#endif - -#define STB_UNUSED(x) do { (void)(x); } while (0) - -// implementation: -typedef unsigned char uint8; -typedef unsigned short uint16; -typedef signed short int16; -typedef unsigned int uint32; -typedef signed int int32; -typedef unsigned int uint; - -// should produce compiler error if size is wrong -typedef unsigned char validate_uint32[sizeof(uint32)==4]; - -#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) -#define STBI_NO_WRITE -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// Generic API that works on all image types -// - -// this is not threadsafe -static char *failure_reason; - -char *stbi_failure_reason(void) -{ - return failure_reason; -} - -static int e(char *str) -{ - failure_reason = str; - return 0; -} - -#ifdef STBI_NO_FAILURE_STRINGS - #define e(x,y) 0 -#elif defined(STBI_FAILURE_USERMSG) - #define e(x,y) e(y) -#else - #define e(x,y) e(x) -#endif - -#define epf(x,y) ((float *) (e(x,y)?NULL:NULL)) -#define epuc(x,y) ((unsigned char *) (e(x,y)?NULL:NULL)) - -void stbi_image_free(void *retval_from_stbi_load) -{ - free(retval_from_stbi_load); -} - -#define MAX_LOADERS 32 -stbi_loader *loaders[MAX_LOADERS]; -static int max_loaders = 0; - -int stbi_register_loader(stbi_loader *loader) -{ - int i; - for (i=0; i < MAX_LOADERS; ++i) { - // already present? - if (loaders[i] == loader) - return 1; - // end of the list? - if (loaders[i] == NULL) { - loaders[i] = loader; - max_loaders = i+1; - return 1; - } - } - // no room for it - return 0; -} - -#ifndef STBI_NO_HDR -static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp); -static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp); -#endif - -#ifndef STBI_NO_STDIO -unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = fopen(filename, "rb"); - unsigned char *result; - if (!f) return epuc("can't fopen", "Unable to open file"); - result = stbi_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - int i; - if (stbi_jpeg_test_file(f)) - return stbi_jpeg_load_from_file(f,x,y,comp,req_comp); - if (stbi_png_test_file(f)) - return stbi_png_load_from_file(f,x,y,comp,req_comp); - if (stbi_bmp_test_file(f)) - return stbi_bmp_load_from_file(f,x,y,comp,req_comp); - if (stbi_psd_test_file(f)) - return stbi_psd_load_from_file(f,x,y,comp,req_comp); -#ifndef STBI_NO_HDR - if (stbi_hdr_test_file(f)) { - float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp); - return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); - } -#endif - for (i=0; i < max_loaders; ++i) - if (loaders[i]->test_file(f)) - return loaders[i]->load_from_file(f,x,y,comp,req_comp); - // test tga last because it's a crappy test! - if (stbi_tga_test_file(f)) - return stbi_tga_load_from_file(f,x,y,comp,req_comp); - return epuc("unknown image type", "Image not of any known type, or corrupt"); -} -#endif - -unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - int i; - if (stbi_jpeg_test_memory(buffer,len)) - return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_png_test_memory(buffer,len)) - return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_bmp_test_memory(buffer,len)) - return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_psd_test_memory(buffer,len)) - return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp); -#ifndef STBI_NO_HDR - if (stbi_hdr_test_memory(buffer, len)) { - float *hdr = stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); - return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); - } -#endif - for (i=0; i < max_loaders; ++i) - if (loaders[i]->test_memory(buffer,len)) - return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp); - // test tga last because it's a crappy test! - if (stbi_tga_test_memory(buffer,len)) - return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp); - return epuc("unknown image type", "Image not of any known type, or corrupt"); -} - -#ifndef STBI_NO_HDR - -#ifndef STBI_NO_STDIO -float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = fopen(filename, "rb"); - float *result; - if (!f) return epf("can't fopen", "Unable to open file"); - result = stbi_loadf_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; -#ifndef STBI_NO_HDR - if (stbi_hdr_test_file(f)) - return stbi_hdr_load_from_file(f,x,y,comp,req_comp); -#endif - data = stbi_load_from_file(f, x, y, comp, req_comp); - if (data) - return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); - return epf("unknown image type", "Image not of any known type, or corrupt"); -} -#endif - -float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; -#ifndef STBI_NO_HDR - if (stbi_hdr_test_memory(buffer, len)) - return stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); -#endif - data = stbi_load_from_memory(buffer, len, x, y, comp, req_comp); - if (data) - return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); - return epf("unknown image type", "Image not of any known type, or corrupt"); -} -#endif - -// these is-hdr-or-not is defined independent of whether STBI_NO_HDR is -// defined, for API simplicity; if STBI_NO_HDR is defined, it always -// reports false! - -int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) -{ -#ifndef STBI_NO_HDR - return stbi_hdr_test_memory(buffer, len); -#else - return 0; -#endif -} - -#ifndef STBI_NO_STDIO -extern int stbi_is_hdr(char const *filename) -{ - FILE *f = fopen(filename, "rb"); - int result=0; - if (f) { - result = stbi_is_hdr_from_file(f); - fclose(f); - } - return result; -} - -extern int stbi_is_hdr_from_file(FILE *f) -{ -#ifndef STBI_NO_HDR - return stbi_hdr_test_file(f); -#else - return 0; -#endif -} - -#endif - -// @TODO: get image dimensions & components without fully decoding -#ifndef STBI_NO_STDIO -extern int stbi_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif -extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); - -#ifndef STBI_NO_HDR -static float h2l_gamma_i=1.0f/2.2f, h2l_scale_i=1.0f; -static float l2h_gamma=2.2f, l2h_scale=1.0f; - -void stbi_hdr_to_ldr_gamma(float gamma) { h2l_gamma_i = 1/gamma; } -void stbi_hdr_to_ldr_scale(float scale) { h2l_scale_i = 1/scale; } - -void stbi_ldr_to_hdr_gamma(float gamma) { l2h_gamma = gamma; } -void stbi_ldr_to_hdr_scale(float scale) { l2h_scale = scale; } -#endif - - -////////////////////////////////////////////////////////////////////////////// -// -// Common code used by all image loaders -// - -enum -{ - SCAN_load=0, - SCAN_type, - SCAN_header, -}; - -typedef struct -{ - uint32 img_x, img_y; - int img_n, img_out_n; - -#ifndef STBI_NO_STDIO - FILE *img_file; -#endif - uint8 *img_buffer, *img_buffer_end; -} stbi; - -#ifndef STBI_NO_STDIO -static void start_file(stbi *s, FILE *f) -{ - s->img_file = f; -} -#endif - -static void start_mem(stbi *s, uint8 const *buffer, int len) -{ -#ifndef STBI_NO_STDIO - s->img_file = NULL; -#endif - s->img_buffer = (uint8 *) buffer; - s->img_buffer_end = (uint8 *) buffer+len; -} - -__forceinline static int get8(stbi *s) -{ -#ifndef STBI_NO_STDIO - if (s->img_file) { - int c = fgetc(s->img_file); - return c == EOF ? 0 : c; - } -#endif - if (s->img_buffer < s->img_buffer_end) - return *s->img_buffer++; - return 0; -} - -__forceinline static int at_eof(stbi *s) -{ -#ifndef STBI_NO_STDIO - if (s->img_file) - return feof(s->img_file); -#endif - return s->img_buffer >= s->img_buffer_end; -} - -__forceinline static uint8 get8u(stbi *s) -{ - return (uint8) get8(s); -} - -static void skip(stbi *s, int n) -{ -#ifndef STBI_NO_STDIO - if (s->img_file) - fseek(s->img_file, n, SEEK_CUR); - else -#endif - s->img_buffer += n; -} - -static int get16(stbi *s) -{ - int z = get8(s); - return (z << 8) + get8(s); -} - -static uint32 get32(stbi *s) -{ - uint32 z = get16(s); - return (z << 16) + get16(s); -} - -static int get16le(stbi *s) -{ - int z = get8(s); - return z + (get8(s) << 8); -} - -static uint32 get32le(stbi *s) -{ - uint32 z = get16le(s); - return z + (get16le(s) << 16); -} - -static void getn(stbi *s, stbi_uc *buffer, int n) -{ -#ifndef STBI_NO_STDIO - if (s->img_file) { - fread(buffer, 1, n, s->img_file); - return; - } -#endif - memcpy(buffer, s->img_buffer, n); - s->img_buffer += n; -} - -////////////////////////////////////////////////////////////////////////////// -// -// generic converter from built-in img_n to req_comp -// individual types do this automatically as much as possible (e.g. jpeg -// does all cases internally since it needs to colorspace convert anyway, -// and it never has alpha, so very few cases ). png can automatically -// interleave an alpha=255 channel, but falls back to this for other cases -// -// assume data buffer is malloced, so malloc a new one and free that one -// only failure mode is malloc failing - -static uint8 compute_y(int r, int g, int b) -{ - return (uint8) (((r*77) + (g*150) + (29*b)) >> 8); -} - -static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp, uint x, uint y) -{ - int i,j; - unsigned char *good; - - if (req_comp == img_n) return data; - assert(req_comp >= 1 && req_comp <= 4); - - good = (unsigned char *) malloc(req_comp * x * y); - if (good == NULL) { - free(data); - return epuc("outofmem", "Out of memory"); - } - - for (j=0; j < (int) y; ++j) { - unsigned char *src = data + j * x * img_n ; - unsigned char *dest = good + j * x * req_comp; - -#define COMBO(a,b) ((a)*8+(b)) -#define CASE(a,b) case COMBO(a,b): for(i=x; i >= 0; --i, src += a, dest += b) - // convert source image with img_n components to one with req_comp components; - // avoid switch per pixel, so use switch per scanline and massive macros - switch(COMBO(img_n, req_comp)) { - CASE(1,2) dest[0]=src[0], dest[1]=255; break; - CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break; - CASE(2,1) dest[0]=src[0]; break; - CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break; - CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break; - CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break; - CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break; - CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break; - CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break; - CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break; - default: assert(0); - } -#undef CASE - } - - free(data); - return good; -} - -#ifndef STBI_NO_HDR -static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp) -{ - int i,k,n; - float *output = (float *) malloc(x * y * comp * sizeof(float)); - if (output == NULL) { free(data); return epf("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - output[i*comp + k] = (float) pow(data[i*comp+k]/255.0f, l2h_gamma) * l2h_scale; - } - if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; - } - free(data); - return output; -} - -#define float2int(x) ((int) (x)) -static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp) -{ - int i,k,n; - stbi_uc *output = (stbi_uc *) malloc(x * y * comp); - if (output == NULL) { free(data); return epuc("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - float z = (float) pow(data[i*comp+k]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = float2int(z); - } - if (k < comp) { - float z = data[i*comp+k] * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = float2int(z); - } - } - free(data); - return output; -} -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// "baseline" JPEG/JFIF decoder (not actually fully baseline implementation) -// -// simple implementation -// - channel subsampling of at most 2 in each dimension -// - doesn't support delayed output of y-dimension -// - simple interface (only one output format: 8-bit interleaved RGB) -// - doesn't try to recover corrupt jpegs -// - doesn't allow partial loading, loading multiple at once -// - still fast on x86 (copying globals into locals doesn't help x86) -// - allocates lots of intermediate memory (full size of all components) -// - non-interleaved case requires this anyway -// - allows good upsampling (see next) -// high-quality -// - upsampled channels are bilinearly interpolated, even across blocks -// - quality integer IDCT derived from IJG's 'slow' -// performance -// - fast huffman; reasonable integer IDCT -// - uses a lot of intermediate memory, could cache poorly -// - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4 -// stb_jpeg: 1.34 seconds (MSVC6, default release build) -// stb_jpeg: 1.06 seconds (MSVC6, processor = Pentium Pro) -// IJL11.dll: 1.08 seconds (compiled by intel) -// IJG 1998: 0.98 seconds (MSVC6, makefile provided by IJG) -// IJG 1998: 0.95 seconds (MSVC6, makefile + proc=PPro) - -// huffman decoding acceleration -#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache - -typedef struct -{ - uint8 fast[1 << FAST_BITS]; - // weirdly, repacking this into AoS is a 10% speed loss, instead of a win - uint16 code[256]; - uint8 values[256]; - uint8 size[257]; - unsigned int maxcode[18]; - int delta[17]; // old 'firstsymbol' - old 'firstcode' -} huffman; - -typedef struct -{ -#if STBI_SIMD - unsigned short dequant2[4][64]; -#endif - stbi s; - huffman huff_dc[4]; - huffman huff_ac[4]; - uint8 dequant[4][64]; - - // sizes for components, interleaved MCUs - int img_h_max, img_v_max; - int img_mcu_x, img_mcu_y; - int img_mcu_w, img_mcu_h; - - // definition of jpeg image component - struct - { - int id; - int h,v; - int tq; - int hd,ha; - int dc_pred; - - int x,y,w2,h2; - uint8 *data; - void *raw_data; - uint8 *linebuf; - } img_comp[4]; - - uint32 code_buffer; // jpeg entropy-coded buffer - int code_bits; // number of valid bits - unsigned char marker; // marker seen while filling entropy buffer - int nomore; // flag if we saw a marker so must stop - - int scan_n, order[4]; - int restart_interval, todo; -} jpeg; - -static int build_huffman(huffman *h, int *count) -{ - int i,j,k=0,code; - // build size list for each symbol (from JPEG spec) - for (i=0; i < 16; ++i) - for (j=0; j < count[i]; ++j) - h->size[k++] = (uint8) (i+1); - h->size[k] = 0; - - // compute actual symbols (from jpeg spec) - code = 0; - k = 0; - for(j=1; j <= 16; ++j) { - // compute delta to add to code to compute symbol id - h->delta[j] = k - code; - if (h->size[k] == j) { - while (h->size[k] == j) - h->code[k++] = (uint16) (code++); - if (code-1 >= (1 << j)) return e("bad code lengths","Corrupt JPEG"); - } - // compute largest code + 1 for this size, preshifted as needed later - h->maxcode[j] = code << (16-j); - code <<= 1; - } - h->maxcode[j] = 0xffffffff; - - // build non-spec acceleration table; 255 is flag for not-accelerated - memset(h->fast, 255, 1 << FAST_BITS); - for (i=0; i < k; ++i) { - int s = h->size[i]; - if (s <= FAST_BITS) { - int c = h->code[i] << (FAST_BITS-s); - int m = 1 << (FAST_BITS-s); - for (j=0; j < m; ++j) { - h->fast[c+j] = (uint8) i; - } - } - } - return 1; -} - -static void grow_buffer_unsafe(jpeg *j) -{ - do { - int b = j->nomore ? 0 : get8(&j->s); - if (b == 0xff) { - int c = get8(&j->s); - if (c != 0) { - j->marker = (unsigned char) c; - j->nomore = 1; - return; - } - } - j->code_buffer = (j->code_buffer << 8) | b; - j->code_bits += 8; - } while (j->code_bits <= 24); -} - -// (1 << n) - 1 -static uint32 bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; - -// decode a jpeg huffman value from the bitstream -__forceinline static int decode(jpeg *j, huffman *h) -{ - unsigned int temp; - int c,k; - - if (j->code_bits < 16) grow_buffer_unsafe(j); - - // look at the top FAST_BITS and determine what symbol ID it is, - // if the code is <= FAST_BITS - c = (j->code_buffer >> (j->code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1); - k = h->fast[c]; - if (k < 255) { - if (h->size[k] > j->code_bits) - return -1; - j->code_bits -= h->size[k]; - return h->values[k]; - } - - // naive test is to shift the code_buffer down so k bits are - // valid, then test against maxcode. To speed this up, we've - // preshifted maxcode left so that it has (16-k) 0s at the - // end; in other words, regardless of the number of bits, it - // wants to be compared against something shifted to have 16; - // that way we don't need to shift inside the loop. - if (j->code_bits < 16) - temp = (j->code_buffer << (16 - j->code_bits)) & 0xffff; - else - temp = (j->code_buffer >> (j->code_bits - 16)) & 0xffff; - for (k=FAST_BITS+1 ; ; ++k) - if (temp < h->maxcode[k]) - break; - if (k == 17) { - // error! code not found - j->code_bits -= 16; - return -1; - } - - if (k > j->code_bits) - return -1; - - // convert the huffman code to the symbol id - c = ((j->code_buffer >> (j->code_bits - k)) & bmask[k]) + h->delta[k]; - assert((((j->code_buffer) >> (j->code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]); - - // convert the id to a symbol - j->code_bits -= k; - return h->values[c]; -} - -// combined JPEG 'receive' and JPEG 'extend', since baseline -// always extends everything it receives. -__forceinline static int extend_receive(jpeg *j, int n) -{ - unsigned int m = 1 << (n-1); - unsigned int k; - if (j->code_bits < n) grow_buffer_unsafe(j); - k = (j->code_buffer >> (j->code_bits - n)) & bmask[n]; - j->code_bits -= n; - // the following test is probably a random branch that won't - // predict well. I tried to table accelerate it but failed. - // maybe it's compiling as a conditional move? - if (k < m) - return (-1 << n) + k + 1; - else - return k; -} - -// given a value that's at position X in the zigzag stream, -// where does it appear in the 8x8 matrix coded as row-major? -static uint8 dezigzag[64+15] = -{ - 0, 1, 8, 16, 9, 2, 3, 10, - 17, 24, 32, 25, 18, 11, 4, 5, - 12, 19, 26, 33, 40, 48, 41, 34, - 27, 20, 13, 6, 7, 14, 21, 28, - 35, 42, 49, 56, 57, 50, 43, 36, - 29, 22, 15, 23, 30, 37, 44, 51, - 58, 59, 52, 45, 38, 31, 39, 46, - 53, 60, 61, 54, 47, 55, 62, 63, - // let corrupt input sample past end - 63, 63, 63, 63, 63, 63, 63, 63, - 63, 63, 63, 63, 63, 63, 63 -}; - -// decode one 64-entry block-- -static int decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b) -{ - int diff,dc,k; - int t = decode(j, hdc); - if (t < 0) return e("bad huffman code","Corrupt JPEG"); - - // 0 all the ac values now so we can do it 32-bits at a time - memset(data,0,64*sizeof(data[0])); - - diff = t ? extend_receive(j, t) : 0; - dc = j->img_comp[b].dc_pred + diff; - j->img_comp[b].dc_pred = dc; - data[0] = (short) dc; - - // decode AC components, see JPEG spec - k = 1; - do { - int r,s; - int rs = decode(j, hac); - if (rs < 0) return e("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (rs != 0xf0) break; // end block - k += 16; - } else { - k += r; - // decode into unzigzag'd location - data[dezigzag[k++]] = (short) extend_receive(j,s); - } - } while (k < 64); - return 1; -} - -// take a -128..127 value and clamp it and convert to 0..255 -__forceinline static uint8 clamp(int x) -{ - x += 128; - // trick to use a single test to catch both cases - if ((unsigned int) x > 255) { - if (x < 0) return 0; - if (x > 255) return 255; - } - return (uint8) x; -} - -#define f2f(x) (int) (((x) * 4096 + 0.5)) -#define fsh(x) ((x) << 12) - -// derived from jidctint -- DCT_ISLOW -#define IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ - int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ - p2 = s2; \ - p3 = s6; \ - p1 = (p2+p3) * f2f(0.5411961f); \ - t2 = p1 + p3*f2f(-1.847759065f); \ - t3 = p1 + p2*f2f( 0.765366865f); \ - p2 = s0; \ - p3 = s4; \ - t0 = fsh(p2+p3); \ - t1 = fsh(p2-p3); \ - x0 = t0+t3; \ - x3 = t0-t3; \ - x1 = t1+t2; \ - x2 = t1-t2; \ - t0 = s7; \ - t1 = s5; \ - t2 = s3; \ - t3 = s1; \ - p3 = t0+t2; \ - p4 = t1+t3; \ - p1 = t0+t3; \ - p2 = t1+t2; \ - p5 = (p3+p4)*f2f( 1.175875602f); \ - t0 = t0*f2f( 0.298631336f); \ - t1 = t1*f2f( 2.053119869f); \ - t2 = t2*f2f( 3.072711026f); \ - t3 = t3*f2f( 1.501321110f); \ - p1 = p5 + p1*f2f(-0.899976223f); \ - p2 = p5 + p2*f2f(-2.562915447f); \ - p3 = p3*f2f(-1.961570560f); \ - p4 = p4*f2f(-0.390180644f); \ - t3 += p1+p4; \ - t2 += p2+p3; \ - t1 += p2+p4; \ - t0 += p1+p3; - -#if !STBI_SIMD -// .344 seconds on 3*anemones.jpg -static void idct_block(uint8 *out, int out_stride, short data[64], uint8 *dequantize) -{ - int i,val[64],*v=val; - uint8 *o,*dq = dequantize; - short *d = data; - - // columns - for (i=0; i < 8; ++i,++d,++dq, ++v) { - // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing - if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 - && d[40]==0 && d[48]==0 && d[56]==0) { - // no shortcut 0 seconds - // (1|2|3|4|5|6|7)==0 0 seconds - // all separate -0.047 seconds - // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds - int dcterm = d[0] * dq[0] << 2; - v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; - } else { - IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24], - d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56]) - // constants scaled things up by 1<<12; let's bring them back - // down, but keep 2 extra bits of precision - x0 += 512; x1 += 512; x2 += 512; x3 += 512; - v[ 0] = (x0+t3) >> 10; - v[56] = (x0-t3) >> 10; - v[ 8] = (x1+t2) >> 10; - v[48] = (x1-t2) >> 10; - v[16] = (x2+t1) >> 10; - v[40] = (x2-t1) >> 10; - v[24] = (x3+t0) >> 10; - v[32] = (x3-t0) >> 10; - } - } - - for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { - // no fast case since the first 1D IDCT spread components out - IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) - // constants scaled things up by 1<<12, plus we had 1<<2 from first - // loop, plus horizontal and vertical each scale by sqrt(8) so together - // we've got an extra 1<<3, so 1<<17 total we need to remove. - x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536; - o[0] = clamp((x0+t3) >> 17); - o[7] = clamp((x0-t3) >> 17); - o[1] = clamp((x1+t2) >> 17); - o[6] = clamp((x1-t2) >> 17); - o[2] = clamp((x2+t1) >> 17); - o[5] = clamp((x2-t1) >> 17); - o[3] = clamp((x3+t0) >> 17); - o[4] = clamp((x3-t0) >> 17); - } -} -#else -static void idct_block(uint8 *out, int out_stride, short data[64], unsigned short *dequantize) -{ - int i,val[64],*v=val; - uint8 *o; - unsigned short *dq = dequantize; - short *d = data; - - // columns - for (i=0; i < 8; ++i,++d,++dq, ++v) { - // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing - if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 - && d[40]==0 && d[48]==0 && d[56]==0) { - // no shortcut 0 seconds - // (1|2|3|4|5|6|7)==0 0 seconds - // all separate -0.047 seconds - // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds - int dcterm = d[0] * dq[0] << 2; - v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; - } else { - IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24], - d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56]) - // constants scaled things up by 1<<12; let's bring them back - // down, but keep 2 extra bits of precision - x0 += 512; x1 += 512; x2 += 512; x3 += 512; - v[ 0] = (x0+t3) >> 10; - v[56] = (x0-t3) >> 10; - v[ 8] = (x1+t2) >> 10; - v[48] = (x1-t2) >> 10; - v[16] = (x2+t1) >> 10; - v[40] = (x2-t1) >> 10; - v[24] = (x3+t0) >> 10; - v[32] = (x3-t0) >> 10; - } - } - - for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { - // no fast case since the first 1D IDCT spread components out - IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) - // constants scaled things up by 1<<12, plus we had 1<<2 from first - // loop, plus horizontal and vertical each scale by sqrt(8) so together - // we've got an extra 1<<3, so 1<<17 total we need to remove. - x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536; - o[0] = clamp((x0+t3) >> 17); - o[7] = clamp((x0-t3) >> 17); - o[1] = clamp((x1+t2) >> 17); - o[6] = clamp((x1-t2) >> 17); - o[2] = clamp((x2+t1) >> 17); - o[5] = clamp((x2-t1) >> 17); - o[3] = clamp((x3+t0) >> 17); - o[4] = clamp((x3-t0) >> 17); - } -} -static stbi_idct_8x8 stbi_idct_installed = idct_block; - -extern void stbi_install_idct(stbi_idct_8x8 func) -{ - stbi_idct_installed = func; -} -#endif - -#define MARKER_none 0xff -// if there's a pending marker from the entropy stream, return that -// otherwise, fetch from the stream and get a marker. if there's no -// marker, return 0xff, which is never a valid marker value -static uint8 get_marker(jpeg *j) -{ - uint8 x; - if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; } - x = get8u(&j->s); - if (x != 0xff) return MARKER_none; - while (x == 0xff) - x = get8u(&j->s); - return x; -} - -// in each scan, we'll have scan_n components, and the order -// of the components is specified by order[] -#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) - -// after a restart interval, reset the entropy decoder and -// the dc prediction -static void reset(jpeg *j) -{ - j->code_bits = 0; - j->code_buffer = 0; - j->nomore = 0; - j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; - j->marker = MARKER_none; - j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; - // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, - // since we don't even allow 1<<30 pixels -} - -static int parse_entropy_coded_data(jpeg *z) -{ - reset(z); - if (z->scan_n == 1) { - int i,j; -#if STBI_SIMD - __declspec(align(16)) - #endif - short data[64]; - int n = z->order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0; -#if STBI_SIMD - stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]); -#else - idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]); -#endif - // every data block is an MCU, so countdown the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) grow_buffer_unsafe(z); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!RESTART(z->marker)) return 1; - reset(z); - } - } - } - } else { // interleaved! - int i,j,k,x,y; - short data[64]; - for (j=0; j < z->img_mcu_y; ++j) { - for (i=0; i < z->img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < z->scan_n; ++k) { - int n = z->order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < z->img_comp[n].v; ++y) { - for (x=0; x < z->img_comp[n].h; ++x) { - int x2 = (i*z->img_comp[n].h + x)*8; - int y2 = (j*z->img_comp[n].v + y)*8; - if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0; -#if STBI_SIMD - stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]); -#else - idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]); -#endif - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) grow_buffer_unsafe(z); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!RESTART(z->marker)) return 1; - reset(z); - } - } - } - } - return 1; -} - -static int process_marker(jpeg *z, int m) -{ - int L; - switch (m) { - case MARKER_none: // no marker found - return e("expected marker","Corrupt JPEG"); - - case 0xC2: // SOF - progressive - return e("progressive jpeg","JPEG format not supported (progressive)"); - - case 0xDD: // DRI - specify restart interval - if (get16(&z->s) != 4) return e("bad DRI len","Corrupt JPEG"); - z->restart_interval = get16(&z->s); - return 1; - - case 0xDB: // DQT - define quantization table - L = get16(&z->s)-2; - while (L > 0) { - int q = get8(&z->s); - int p = q >> 4; - int t = q & 15,i; - if (p != 0) return e("bad DQT type","Corrupt JPEG"); - if (t > 3) return e("bad DQT table","Corrupt JPEG"); - for (i=0; i < 64; ++i) - z->dequant[t][dezigzag[i]] = get8u(&z->s); -#if STBI_SIMD - for (i=0; i < 64; ++i) - z->dequant2[t][i] = dequant[t][i]; -#endif - L -= 65; - } - return L==0; - - case 0xC4: // DHT - define huffman table - L = get16(&z->s)-2; - while (L > 0) { - uint8 *v; - int sizes[16],i,m=0; - int q = get8(&z->s); - int tc = q >> 4; - int th = q & 15; - if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG"); - for (i=0; i < 16; ++i) { - sizes[i] = get8(&z->s); - m += sizes[i]; - } - L -= 17; - if (tc == 0) { - if (!build_huffman(z->huff_dc+th, sizes)) return 0; - v = z->huff_dc[th].values; - } else { - if (!build_huffman(z->huff_ac+th, sizes)) return 0; - v = z->huff_ac[th].values; - } - for (i=0; i < m; ++i) - v[i] = get8u(&z->s); - L -= m; - } - return L==0; - } - // check for comment block or APP blocks - if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { - skip(&z->s, get16(&z->s)-2); - return 1; - } - return 0; -} - -// after we see SOS -static int process_scan_header(jpeg *z) -{ - int i; - int Ls = get16(&z->s); - z->scan_n = get8(&z->s); - if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s.img_n) return e("bad SOS component count","Corrupt JPEG"); - if (Ls != 6+2*z->scan_n) return e("bad SOS len","Corrupt JPEG"); - for (i=0; i < z->scan_n; ++i) { - int id = get8(&z->s), which; - int q = get8(&z->s); - for (which = 0; which < z->s.img_n; ++which) - if (z->img_comp[which].id == id) - break; - if (which == z->s.img_n) return 0; - z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG"); - z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG"); - z->order[i] = which; - } - if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG"); - get8(&z->s); // should be 63, but might be 0 - if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG"); - - return 1; -} - -static int process_frame_header(jpeg *z, int scan) -{ - stbi *s = &z->s; - int Lf,p,i,q, h_max=1,v_max=1; - Lf = get16(s); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG - p = get8(s); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline - s->img_y = get16(s); if (s->img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG - s->img_x = get16(s); if (s->img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires - s->img_n = get8(s); - if (s->img_n != 3 && s->img_n != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires - - if (Lf != 8+3*s->img_n) return e("bad SOF len","Corrupt JPEG"); - - for (i=0; i < s->img_n; ++i) { - z->img_comp[i].id = get8(s); - if (z->img_comp[i].id != i+1) // JFIF requires - if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files! - return e("bad component ID","Corrupt JPEG"); - q = get8(s); - z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H","Corrupt JPEG"); - z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V","Corrupt JPEG"); - z->img_comp[i].tq = get8(s); if (z->img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG"); - } - - if (scan != SCAN_load) return 1; - - if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode"); - - for (i=0; i < s->img_n; ++i) { - if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; - if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; - } - - // compute interleaved mcu info - z->img_h_max = h_max; - z->img_v_max = v_max; - z->img_mcu_w = h_max * 8; - z->img_mcu_h = v_max * 8; - z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; - z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; - - for (i=0; i < s->img_n; ++i) { - // number of effective pixels (e.g. for non-interleaved MCU) - z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; - z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; - // to simplify generation, we'll allocate enough memory to decode - // the bogus oversized data from using interleaved MCUs and their - // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't - // discard the extra data until colorspace conversion - z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; - z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; - z->img_comp[i].raw_data = malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15); - if (z->img_comp[i].raw_data == NULL) { - for(--i; i >= 0; --i) { - free(z->img_comp[i].raw_data); - z->img_comp[i].data = NULL; - } - return e("outofmem", "Out of memory"); - } - // align blocks for installable-idct using mmx/sse - z->img_comp[i].data = (uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); - z->img_comp[i].linebuf = NULL; - } - - return 1; -} - -// use comparisons since in some cases we handle more than one case (e.g. SOF) -#define DNL(x) ((x) == 0xdc) -#define SOI(x) ((x) == 0xd8) -#define EOI(x) ((x) == 0xd9) -#define SOF(x) ((x) == 0xc0 || (x) == 0xc1) -#define SOS(x) ((x) == 0xda) - -static int decode_jpeg_header(jpeg *z, int scan) -{ - int m; - z->marker = MARKER_none; // initialize cached marker to empty - m = get_marker(z); - if (!SOI(m)) return e("no SOI","Corrupt JPEG"); - if (scan == SCAN_type) return 1; - m = get_marker(z); - while (!SOF(m)) { - if (!process_marker(z,m)) return 0; - m = get_marker(z); - while (m == MARKER_none) { - // some files have extra padding after their blocks, so ok, we'll scan - if (at_eof(&z->s)) return e("no SOF", "Corrupt JPEG"); - m = get_marker(z); - } - } - if (!process_frame_header(z, scan)) return 0; - return 1; -} - -static int decode_jpeg_image(jpeg *j) -{ - int m; - j->restart_interval = 0; - if (!decode_jpeg_header(j, SCAN_load)) return 0; - m = get_marker(j); - while (!EOI(m)) { - if (SOS(m)) { - if (!process_scan_header(j)) return 0; - if (!parse_entropy_coded_data(j)) return 0; - } else { - if (!process_marker(j, m)) return 0; - } - m = get_marker(j); - } - return 1; -} - -// static jfif-centered resampling (across block boundaries) - -typedef uint8 *(*resample_row_func)(uint8 *out, uint8 *in0, uint8 *in1, - int w, int hs); - -#define div4(x) ((uint8) ((x) >> 2)) - -static uint8 *resample_row_1(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) -{ - STB_UNUSED(out); - STB_UNUSED(in_far); - STB_UNUSED(w); - STB_UNUSED(hs); - return in_near; -} - -static uint8* resample_row_v_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) -{ - STB_UNUSED(hs); - // need to generate two samples vertically for every one in input - int i; - for (i=0; i < w; ++i) - out[i] = div4(3*in_near[i] + in_far[i] + 2); - return out; -} - -static uint8* resample_row_h_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) -{ - STB_UNUSED(in_far); - STB_UNUSED(hs); - // need to generate two samples horizontally for every one in input - int i; - uint8 *input = in_near; - if (w == 1) { - // if only one sample, can't do any interpolation - out[0] = out[1] = input[0]; - return out; - } - - out[0] = input[0]; - out[1] = div4(input[0]*3 + input[1] + 2); - for (i=1; i < w-1; ++i) { - int n = 3*input[i]+2; - out[i*2+0] = div4(n+input[i-1]); - out[i*2+1] = div4(n+input[i+1]); - } - out[i*2+0] = div4(input[w-2]*3 + input[w-1] + 2); - out[i*2+1] = input[w-1]; - return out; -} - -#define div16(x) ((uint8) ((x) >> 4)) - -static uint8 *resample_row_hv_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) -{ - STB_UNUSED(hs); - // need to generate 2x2 samples for every one in input - int i,t0,t1; - if (w == 1) { - out[0] = out[1] = div4(3*in_near[0] + in_far[0] + 2); - return out; - } - - t1 = 3*in_near[0] + in_far[0]; - out[0] = div4(t1+2); - for (i=1; i < w; ++i) { - t0 = t1; - t1 = 3*in_near[i]+in_far[i]; - out[i*2-1] = div16(3*t0 + t1 + 8); - out[i*2 ] = div16(3*t1 + t0 + 8); - } - out[w*2-1] = div4(t1+2); - return out; -} - -static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) -{ - STB_UNUSED(in_far); - // resample with nearest-neighbor - int i,j; - for (i=0; i < w; ++i) - for (j=0; j < hs; ++j) - out[i*hs+j] = in_near[i]; - return out; -} - -#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) - -// 0.38 seconds on 3*anemones.jpg (0.25 with processor = Pro) -// VC6 without processor=Pro is generating multiple LEAs per multiply! -static void YCbCr_to_RGB_row(uint8 *out, uint8 *y, uint8 *pcb, uint8 *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 16) + 32768; // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr*float2fixed(1.40200f); - g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); - b = y_fixed + cb*float2fixed(1.77200f); - r >>= 16; - g >>= 16; - b >>= 16; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (uint8)r; - out[1] = (uint8)g; - out[2] = (uint8)b; - out[3] = 255; - out += step; - } -} - -#if STBI_SIMD -static stbi_YCbCr_to_RGB_run stbi_YCbCr_installed = YCbCr_to_RGB_row; - -void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func) -{ - stbi_YCbCr_installed = func; -} -#endif - - -// clean up the temporary component buffers -static void cleanup_jpeg(jpeg *j) -{ - int i; - for (i=0; i < j->s.img_n; ++i) { - if (j->img_comp[i].data) { - free(j->img_comp[i].raw_data); - j->img_comp[i].data = NULL; - } - if (j->img_comp[i].linebuf) { - free(j->img_comp[i].linebuf); - j->img_comp[i].linebuf = NULL; - } - } -} - -typedef struct -{ - resample_row_func resample; - uint8 *line0,*line1; - int hs,vs; // expansion factor in each axis - int w_lores; // horizontal pixels pre-expansion - int ystep; // how far through vertical expansion we are - int ypos; // which pre-expansion row we're on -} stbi_resample; - -static uint8 *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) -{ - int n, decode_n; - // validate req_comp - if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error"); - - // load a jpeg image from whichever source - if (!decode_jpeg_image(z)) { cleanup_jpeg(z); return NULL; } - - // determine actual number of components to generate - n = req_comp ? req_comp : z->s.img_n; - - if (z->s.img_n == 3 && n < 3) - decode_n = 1; - else - decode_n = z->s.img_n; - - // resample and color-convert - { - int k; - uint i,j; - uint8 *output; - uint8 *coutput[4]; - - stbi_resample res_comp[4]; - - for (k=0; k < decode_n; ++k) { - stbi_resample *r = &res_comp[k]; - - // allocate line buffer big enough for upsampling off the edges - // with upsample factor of 4 - z->img_comp[k].linebuf = (uint8 *) malloc(z->s.img_x + 3); - if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); } - - r->hs = z->img_h_max / z->img_comp[k].h; - r->vs = z->img_v_max / z->img_comp[k].v; - r->ystep = r->vs >> 1; - r->w_lores = (z->s.img_x + r->hs-1) / r->hs; - r->ypos = 0; - r->line0 = r->line1 = z->img_comp[k].data; - - if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; - else if (r->hs == 1 && r->vs == 2) r->resample = resample_row_v_2; - else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2; - else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2; - else r->resample = resample_row_generic; - } - - // can't error after this so, this is safe - output = (uint8 *) malloc(n * z->s.img_x * z->s.img_y + 1); - if (!output) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); } - - // now go ahead and resample - for (j=0; j < z->s.img_y; ++j) { - uint8 *out = output + n * z->s.img_x * j; - for (k=0; k < decode_n; ++k) { - stbi_resample *r = &res_comp[k]; - int y_bot = r->ystep >= (r->vs >> 1); - coutput[k] = r->resample(z->img_comp[k].linebuf, - y_bot ? r->line1 : r->line0, - y_bot ? r->line0 : r->line1, - r->w_lores, r->hs); - if (++r->ystep >= r->vs) { - r->ystep = 0; - r->line0 = r->line1; - if (++r->ypos < z->img_comp[k].y) - r->line1 += z->img_comp[k].w2; - } - } - if (n >= 3) { - uint8 *y = coutput[0]; - if (z->s.img_n == 3) { -#if STBI_SIMD - stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n); -#else - YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s.img_x, n); -#endif - } else - for (i=0; i < z->s.img_x; ++i) { - out[0] = out[1] = out[2] = y[i]; - out[3] = 255; // not used if n==3 - out += n; - } - } else { - uint8 *y = coutput[0]; - if (n == 1) - for (i=0; i < z->s.img_x; ++i) out[i] = y[i]; - else - for (i=0; i < z->s.img_x; ++i) *out++ = y[i], *out++ = 255; - } - } - cleanup_jpeg(z); - *out_x = z->s.img_x; - *out_y = z->s.img_y; - if (comp) *comp = z->s.img_n; // report original components, not output - return output; - } -} - -#ifndef STBI_NO_STDIO -unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - jpeg j; - start_file(&j.s, f); - return load_jpeg_image(&j, x,y,comp,req_comp); -} - -unsigned char *stbi_jpeg_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return data; -} -#endif - -unsigned char *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - jpeg j; - start_mem(&j.s, buffer,len); - return load_jpeg_image(&j, x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -int stbi_jpeg_test_file(FILE *f) -{ - int n,r; - jpeg j; - n = ftell(f); - start_file(&j.s, f); - r = decode_jpeg_header(&j, SCAN_type); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_jpeg_test_memory(stbi_uc const *buffer, int len) -{ - jpeg j; - start_mem(&j.s, buffer,len); - return decode_jpeg_header(&j, SCAN_type); -} - -// @TODO: -#ifndef STBI_NO_STDIO -extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif -extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); - -// public domain zlib decode v0.2 Sean Barrett 2006-11-18 -// simple implementation -// - all input must be provided in an upfront buffer -// - all output is written to a single output buffer (can malloc/realloc) -// performance -// - fast huffman - -// fast-way is faster to check than jpeg huffman, but slow way is slower -#define ZFAST_BITS 9 // accelerate all cases in default tables -#define ZFAST_MASK ((1 << ZFAST_BITS) - 1) - -// zlib-style huffman encoding -// (jpegs packs from left, zlib from right, so can't share code) -typedef struct -{ - uint16 fast[1 << ZFAST_BITS]; - uint16 firstcode[16]; - int maxcode[17]; - uint16 firstsymbol[16]; - uint8 size[288]; - uint16 value[288]; -} zhuffman; - -__forceinline static int bitreverse16(int n) -{ - n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); - n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); - n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); - n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); - return n; -} - -__forceinline static int bit_reverse(int v, int bits) -{ - assert(bits <= 16); - // to bit reverse n bits, reverse 16 and shift - // e.g. 11 bits, bit reverse and shift away 5 - return bitreverse16(v) >> (16-bits); -} - -static int zbuild_huffman(zhuffman *z, uint8 *sizelist, int num) -{ - int i,k=0; - int code, next_code[16], sizes[17]; - - // DEFLATE spec for generating codes - memset(sizes, 0, sizeof(sizes)); - memset(z->fast, 255, sizeof(z->fast)); - for (i=0; i < num; ++i) - ++sizes[sizelist[i]]; - sizes[0] = 0; - for (i=1; i < 16; ++i) - assert(sizes[i] <= (1 << i)); - code = 0; - for (i=1; i < 16; ++i) { - next_code[i] = code; - z->firstcode[i] = (uint16) code; - z->firstsymbol[i] = (uint16) k; - code = (code + sizes[i]); - if (sizes[i]) - if (code-1 >= (1 << i)) return e("bad codelengths","Corrupt JPEG"); - z->maxcode[i] = code << (16-i); // preshift for inner loop - code <<= 1; - k += sizes[i]; - } - z->maxcode[16] = 0x10000; // sentinel - for (i=0; i < num; ++i) { - int s = sizelist[i]; - if (s) { - int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; - z->size[c] = (uint8)s; - z->value[c] = (uint16)i; - if (s <= ZFAST_BITS) { - int k = bit_reverse(next_code[s],s); - while (k < (1 << ZFAST_BITS)) { - z->fast[k] = (uint16) c; - k += (1 << s); - } - } - ++next_code[s]; - } - } - return 1; -} - -// zlib-from-memory implementation for PNG reading -// because PNG allows splitting the zlib stream arbitrarily, -// and it's annoying structurally to have PNG call ZLIB call PNG, -// we require PNG read all the IDATs and combine them into a single -// memory buffer - -typedef struct -{ - uint8 *zbuffer, *zbuffer_end; - int num_bits; - uint32 code_buffer; - - char *zout; - char *zout_start; - char *zout_end; - int z_expandable; - - zhuffman z_length, z_distance; -} zbuf; - -__forceinline static int zget8(zbuf *z) -{ - if (z->zbuffer >= z->zbuffer_end) return 0; - return *z->zbuffer++; -} - -static void fill_bits(zbuf *z) -{ - do { - assert(z->code_buffer < (1U << z->num_bits)); - z->code_buffer |= zget8(z) << z->num_bits; - z->num_bits += 8; - } while (z->num_bits <= 24); -} - -__forceinline static unsigned int zreceive(zbuf *z, int n) -{ - unsigned int k; - if (z->num_bits < n) fill_bits(z); - k = z->code_buffer & ((1 << n) - 1); - z->code_buffer >>= n; - z->num_bits -= n; - return k; -} - -__forceinline static int zhuffman_decode(zbuf *a, zhuffman *z) -{ - int b,s,k; - if (a->num_bits < 16) fill_bits(a); - b = z->fast[a->code_buffer & ZFAST_MASK]; - if (b < 0xffff) { - s = z->size[b]; - a->code_buffer >>= s; - a->num_bits -= s; - return z->value[b]; - } - - // not resolved by fast table, so compute it the slow way - // use jpeg approach, which requires MSbits at top - k = bit_reverse(a->code_buffer, 16); - for (s=ZFAST_BITS+1; ; ++s) - if (k < z->maxcode[s]) - break; - if (s == 16) return -1; // invalid code! - // code size is s, so: - b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; - assert(z->size[b] == s); - a->code_buffer >>= s; - a->num_bits -= s; - return z->value[b]; -} - -static int expand(zbuf *z, int n) // need to make room for n bytes -{ - char *q; - int cur, limit; - if (!z->z_expandable) return e("output buffer limit","Corrupt PNG"); - cur = (int) (z->zout - z->zout_start); - limit = (int) (z->zout_end - z->zout_start); - while (cur + n > limit) - limit *= 2; - q = (char *) realloc(z->zout_start, limit); - if (q == NULL) return e("outofmem", "Out of memory"); - z->zout_start = q; - z->zout = q + cur; - z->zout_end = q + limit; - return 1; -} - -static int length_base[31] = { - 3,4,5,6,7,8,9,10,11,13, - 15,17,19,23,27,31,35,43,51,59, - 67,83,99,115,131,163,195,227,258,0,0 }; - -static int length_extra[31]= -{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; - -static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, - 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; - -static int dist_extra[32] = -{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; - -static int parse_huffman_block(zbuf *a) -{ - for(;;) { - int z = zhuffman_decode(a, &a->z_length); - if (z < 256) { - if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes - if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0; - *a->zout++ = (char) z; - } else { - uint8 *p; - int len,dist; - if (z == 256) return 1; - z -= 257; - len = length_base[z]; - if (length_extra[z]) len += zreceive(a, length_extra[z]); - z = zhuffman_decode(a, &a->z_distance); - if (z < 0) return e("bad huffman code","Corrupt PNG"); - dist = dist_base[z]; - if (dist_extra[z]) dist += zreceive(a, dist_extra[z]); - if (a->zout - a->zout_start < dist) return e("bad dist","Corrupt PNG"); - if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0; - p = (uint8 *) (a->zout - dist); - while (len--) - *a->zout++ = *p++; - } - } -} - -static int compute_huffman_codes(zbuf *a) -{ - static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; - static zhuffman z_codelength; // static just to save stack space - uint8 lencodes[286+32+137];//padding for maximum single op - uint8 codelength_sizes[19]; - int i,n; - - int hlit = zreceive(a,5) + 257; - int hdist = zreceive(a,5) + 1; - int hclen = zreceive(a,4) + 4; - - memset(codelength_sizes, 0, sizeof(codelength_sizes)); - for (i=0; i < hclen; ++i) { - int s = zreceive(a,3); - codelength_sizes[length_dezigzag[i]] = (uint8) s; - } - if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; - - n = 0; - while (n < hlit + hdist) { - int c = zhuffman_decode(a, &z_codelength); - assert(c >= 0 && c < 19); - if (c < 16) - lencodes[n++] = (uint8) c; - else if (c == 16) { - c = zreceive(a,2)+3; - memset(lencodes+n, lencodes[n-1], c); - n += c; - } else if (c == 17) { - c = zreceive(a,3)+3; - memset(lencodes+n, 0, c); - n += c; - } else { - assert(c == 18); - c = zreceive(a,7)+11; - memset(lencodes+n, 0, c); - n += c; - } - } - if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG"); - if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; - if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; - return 1; -} - -static int parse_uncompressed_block(zbuf *a) -{ - uint8 header[4]; - int len,nlen,k; - if (a->num_bits & 7) - zreceive(a, a->num_bits & 7); // discard - // drain the bit-packed data into header - k = 0; - while (a->num_bits > 0) { - header[k++] = (uint8) (a->code_buffer & 255); // wtf this warns? - a->code_buffer >>= 8; - a->num_bits -= 8; - } - assert(a->num_bits == 0); - // now fill header the normal way - while (k < 4) - header[k++] = (uint8) zget8(a); - len = header[1] * 256 + header[0]; - nlen = header[3] * 256 + header[2]; - if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG"); - if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer","Corrupt PNG"); - if (a->zout + len > a->zout_end) - if (!expand(a, len)) return 0; - memcpy(a->zout, a->zbuffer, len); - a->zbuffer += len; - a->zout += len; - return 1; -} - -static int parse_zlib_header(zbuf *a) -{ - int cmf = zget8(a); - int cm = cmf & 15; - /* int cinfo = cmf >> 4; */ - int flg = zget8(a); - if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec - if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png - if (cm != 8) return e("bad compression","Corrupt PNG"); // DEFLATE required for png - // window = 1 << (8 + cinfo)... but who cares, we fully buffer output - return 1; -} - -// @TODO: should statically initialize these for optimal thread safety -static uint8 default_length[288], default_distance[32]; -static void init_defaults(void) -{ - int i; // use <= to match clearly with spec - for (i=0; i <= 143; ++i) default_length[i] = 8; - for ( ; i <= 255; ++i) default_length[i] = 9; - for ( ; i <= 279; ++i) default_length[i] = 7; - for ( ; i <= 287; ++i) default_length[i] = 8; - - for (i=0; i <= 31; ++i) default_distance[i] = 5; -} - -static int parse_zlib(zbuf *a, int parse_header) -{ - int final, type; - if (parse_header) - if (!parse_zlib_header(a)) return 0; - a->num_bits = 0; - a->code_buffer = 0; - do { - final = zreceive(a,1); - type = zreceive(a,2); - if (type == 0) { - if (!parse_uncompressed_block(a)) return 0; - } else if (type == 3) { - return 0; - } else { - if (type == 1) { - // use fixed code lengths - if (!default_distance[31]) init_defaults(); - if (!zbuild_huffman(&a->z_length , default_length , 288)) return 0; - if (!zbuild_huffman(&a->z_distance, default_distance, 32)) return 0; - } else { - if (!compute_huffman_codes(a)) return 0; - } - if (!parse_huffman_block(a)) return 0; - } - } while (!final); - return 1; -} - -static int do_zlib(zbuf *a, char *obuf, int olen, int exp, int parse_header) -{ - a->zout_start = obuf; - a->zout = obuf; - a->zout_end = obuf + olen; - a->z_expandable = exp; - - return parse_zlib(a, parse_header); -} - -char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) -{ - zbuf a; - char *p = (char *) malloc(initial_size); - if (p == NULL) return NULL; - a.zbuffer = (uint8 *) buffer; - a.zbuffer_end = (uint8 *) buffer + len; - if (do_zlib(&a, p, initial_size, 1, 1)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - free(a.zout_start); - return NULL; - } -} - -char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) -{ - return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); -} - -int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) -{ - zbuf a; - a.zbuffer = (uint8 *) ibuffer; - a.zbuffer_end = (uint8 *) ibuffer + ilen; - if (do_zlib(&a, obuffer, olen, 0, 1)) - return (int) (a.zout - a.zout_start); - else - return -1; -} - -char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) -{ - zbuf a; - char *p = (char *) malloc(16384); - if (p == NULL) return NULL; - a.zbuffer = (uint8 *) buffer; - a.zbuffer_end = (uint8 *) buffer+len; - if (do_zlib(&a, p, 16384, 1, 0)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - free(a.zout_start); - return NULL; - } -} - -int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) -{ - zbuf a; - a.zbuffer = (uint8 *) ibuffer; - a.zbuffer_end = (uint8 *) ibuffer + ilen; - if (do_zlib(&a, obuffer, olen, 0, 0)) - return (int) (a.zout - a.zout_start); - else - return -1; -} - -// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 -// simple implementation -// - only 8-bit samples -// - no CRC checking -// - allocates lots of intermediate memory -// - avoids problem of streaming data between subsystems -// - avoids explicit window management -// performance -// - uses stb_zlib, a PD zlib implementation with fast huffman decoding - - -typedef struct -{ - uint32 length; - uint32 type; -} chunk; - -#define PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) - -static chunk get_chunk_header(stbi *s) -{ - chunk c; - c.length = get32(s); - c.type = get32(s); - return c; -} - -static int check_png_header(stbi *s) -{ - static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 }; - int i; - for (i=0; i < 8; ++i) - if (get8(s) != png_sig[i]) return e("bad png sig","Not a PNG"); - return 1; -} - -typedef struct -{ - stbi s; - uint8 *idata, *expanded, *out; -} png; - - -enum { - F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4, - F_avg_first, F_paeth_first, -}; - -static uint8 first_row_filter[5] = -{ - F_none, F_sub, F_none, F_avg_first, F_paeth_first -}; - -static int paeth(int a, int b, int c) -{ - int p = a + b - c; - int pa = abs(p-a); - int pb = abs(p-b); - int pc = abs(p-c); - if (pa <= pb && pa <= pc) return a; - if (pb <= pc) return b; - return c; -} - -// create the png data from post-deflated data -static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n) -{ - stbi *s = &a->s; - uint32 i,j,stride = s->img_x*out_n; - int k; - int img_n = s->img_n; // copy it into a local for later - assert(out_n == s->img_n || out_n == s->img_n+1); - a->out = (uint8 *) malloc(s->img_x * s->img_y * out_n); - if (!a->out) return e("outofmem", "Out of memory"); - if (raw_len != (img_n * s->img_x + 1) * s->img_y) return e("not enough pixels","Corrupt PNG"); - for (j=0; j < s->img_y; ++j) { - uint8 *cur = a->out + stride*j; - uint8 *prior = cur - stride; - int filter = *raw++; - if (filter > 4) return e("invalid filter","Corrupt PNG"); - // if first row, use special filter that doesn't sample previous row - if (j == 0) filter = first_row_filter[filter]; - // handle first pixel explicitly - for (k=0; k < img_n; ++k) { - switch(filter) { - case F_none : cur[k] = raw[k]; break; - case F_sub : cur[k] = raw[k]; break; - case F_up : cur[k] = raw[k] + prior[k]; break; - case F_avg : cur[k] = raw[k] + (prior[k]>>1); break; - case F_paeth : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break; - case F_avg_first : cur[k] = raw[k]; break; - case F_paeth_first: cur[k] = raw[k]; break; - } - } - if (img_n != out_n) cur[img_n] = 255; - raw += img_n; - cur += out_n; - prior += out_n; - // this is a little gross, so that we don't switch per-pixel or per-component - if (img_n == out_n) { -#define CASE(f) \ - case f: \ - for (i=s->img_x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \ - for (k=0; k < img_n; ++k) - switch(filter) { - CASE(F_none) cur[k] = raw[k]; break; - CASE(F_sub) cur[k] = raw[k] + cur[k-img_n]; break; - CASE(F_up) cur[k] = raw[k] + prior[k]; break; - CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break; - CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break; - CASE(F_avg_first) cur[k] = raw[k] + (cur[k-img_n] >> 1); break; - CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break; - } -#undef CASE - } else { - assert(img_n+1 == out_n); -#define CASE(f) \ - case f: \ - for (i=s->img_x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \ - for (k=0; k < img_n; ++k) - switch(filter) { - CASE(F_none) cur[k] = raw[k]; break; - CASE(F_sub) cur[k] = raw[k] + cur[k-out_n]; break; - CASE(F_up) cur[k] = raw[k] + prior[k]; break; - CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break; - CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break; - CASE(F_avg_first) cur[k] = raw[k] + (cur[k-out_n] >> 1); break; - CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break; - } -#undef CASE - } - } - return 1; -} - -static int compute_transparency(png *z, uint8 tc[3], int out_n) -{ - stbi *s = &z->s; - uint32 i, pixel_count = s->img_x * s->img_y; - uint8 *p = z->out; - - // compute color-based transparency, assuming we've - // already got 255 as the alpha value in the output - assert(out_n == 2 || out_n == 4); - - if (out_n == 2) { - for (i=0; i < pixel_count; ++i) { - p[1] = (p[0] == tc[0] ? 0 : 255); - p += 2; - } - } else { - for (i=0; i < pixel_count; ++i) { - if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) - p[3] = 0; - p += 4; - } - } - return 1; -} - -static int expand_palette(png *a, uint8 *palette, int len, int pal_img_n) -{ - STB_UNUSED(len); - uint32 i, pixel_count = a->s.img_x * a->s.img_y; - uint8 *p, *temp_out, *orig = a->out; - - p = (uint8 *) malloc(pixel_count * pal_img_n); - if (p == NULL) return e("outofmem", "Out of memory"); - - // between here and free(out) below, exitting would leak - temp_out = p; - - if (pal_img_n == 3) { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p += 3; - } - } else { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p[3] = palette[n+3]; - p += 4; - } - } - free(a->out); - a->out = temp_out; - return 1; -} - -static int parse_png_file(png *z, int scan, int req_comp) -{ - uint8 palette[1024], pal_img_n=0; - uint8 has_trans=0, tc[3]; - uint32 ioff=0, idata_limit=0, i, pal_len=0; - int first=1,k; - stbi *s = &z->s; - - if (!check_png_header(s)) return 0; - - if (scan == SCAN_type) return 1; - - for(;;first=0) { - chunk c = get_chunk_header(s); - if (first && c.type != PNG_TYPE('I','H','D','R')) - return e("first not IHDR","Corrupt PNG"); - switch (c.type) { - case PNG_TYPE('I','H','D','R'): { - int depth,color,interlace,comp,filter; - if (!first) return e("multiple IHDR","Corrupt PNG"); - if (c.length != 13) return e("bad IHDR len","Corrupt PNG"); - s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large","Very large image (corrupt?)"); - s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large","Very large image (corrupt?)"); - depth = get8(s); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only"); - color = get8(s); if (color > 6) return e("bad ctype","Corrupt PNG"); - if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG"); - comp = get8(s); if (comp) return e("bad comp method","Corrupt PNG"); - filter= get8(s); if (filter) return e("bad filter method","Corrupt PNG"); - interlace = get8(s); if (interlace) return e("interlaced","PNG not supported: interlaced mode"); - if (!s->img_x || !s->img_y) return e("0-pixel image","Corrupt PNG"); - if (!pal_img_n) { - s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); - if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode"); - if (scan == SCAN_header) return 1; - } else { - // if paletted, then pal_n is our final components, and - // img_n is # components to decompress/filter. - s->img_n = 1; - if ((1 << 30) / s->img_x / 4 < s->img_y) return e("too large","Corrupt PNG"); - // if SCAN_header, have to scan to see if we have a tRNS - } - break; - } - - case PNG_TYPE('P','L','T','E'): { - if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG"); - pal_len = c.length / 3; - if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG"); - for (i=0; i < pal_len; ++i) { - palette[i*4+0] = get8u(s); - palette[i*4+1] = get8u(s); - palette[i*4+2] = get8u(s); - palette[i*4+3] = 255; - } - break; - } - - case PNG_TYPE('t','R','N','S'): { - if (z->idata) return e("tRNS after IDAT","Corrupt PNG"); - if (pal_img_n) { - if (scan == SCAN_header) { s->img_n = 4; return 1; } - if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG"); - if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG"); - pal_img_n = 4; - for (i=0; i < c.length; ++i) - palette[i*4+3] = get8u(s); - } else { - if (!(s->img_n & 1)) return e("tRNS with alpha","Corrupt PNG"); - if (c.length != (uint32) s->img_n*2) return e("bad tRNS len","Corrupt PNG"); - has_trans = 1; - for (k=0; k < s->img_n; ++k) - tc[k] = (uint8) get16(s); // non 8-bit images will be larger - } - break; - } - - case PNG_TYPE('I','D','A','T'): { - if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG"); - if (scan == SCAN_header) { s->img_n = pal_img_n; return 1; } - if (ioff + c.length > idata_limit) { - uint8 *p; - if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; - while (ioff + c.length > idata_limit) - idata_limit *= 2; - p = (uint8 *) realloc(z->idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory"); - z->idata = p; - } -#ifndef STBI_NO_STDIO - if (s->img_file) - { - if (fread(z->idata+ioff,1,c.length,s->img_file) != c.length) return e("outofdata","Corrupt PNG"); - } - else -#endif - { - memcpy(z->idata+ioff, s->img_buffer, c.length); - s->img_buffer += c.length; - } - ioff += c.length; - break; - } - - case PNG_TYPE('I','E','N','D'): { - uint32 raw_len; - if (scan != SCAN_load) return 1; - if (z->idata == NULL) return e("no IDAT","Corrupt PNG"); - z->expanded = (uint8 *) stbi_zlib_decode_malloc((char *) z->idata, ioff, (int *) &raw_len); - if (z->expanded == NULL) return 0; // zlib should set error - free(z->idata); z->idata = NULL; - if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) - s->img_out_n = s->img_n+1; - else - s->img_out_n = s->img_n; - if (!create_png_image(z, z->expanded, raw_len, s->img_out_n)) return 0; - if (has_trans) - if (!compute_transparency(z, tc, s->img_out_n)) return 0; - if (pal_img_n) { - // pal_img_n == 3 or 4 - s->img_n = pal_img_n; // record the actual colors we had - s->img_out_n = pal_img_n; - if (req_comp >= 3) s->img_out_n = req_comp; - if (!expand_palette(z, palette, pal_len, s->img_out_n)) - return 0; - } - free(z->expanded); z->expanded = NULL; - return 1; - } - - default: - // if critical, fail - if ((c.type & (1 << 29)) == 0) { -#ifndef STBI_NO_FAILURE_STRINGS - // not threadsafe - static char invalid_chunk[] = "XXXX chunk not known"; - invalid_chunk[0] = (uint8) (c.type >> 24); - invalid_chunk[1] = (uint8) (c.type >> 16); - invalid_chunk[2] = (uint8) (c.type >> 8); - invalid_chunk[3] = (uint8) (c.type >> 0); -#endif - return e(invalid_chunk, "PNG not supported: unknown chunk type"); - } - skip(s, c.length); - break; - } - // end of chunk, read and skip CRC - get32(s); - } -} - -static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp) -{ - unsigned char *result=NULL; - p->expanded = NULL; - p->idata = NULL; - p->out = NULL; - if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error"); - if (parse_png_file(p, SCAN_load, req_comp)) { - result = p->out; - p->out = NULL; - if (req_comp && req_comp != p->s.img_out_n) { - result = convert_format(result, p->s.img_out_n, req_comp, p->s.img_x, p->s.img_y); - p->s.img_out_n = req_comp; - if (result == NULL) return result; - } - *x = p->s.img_x; - *y = p->s.img_y; - if (n) *n = p->s.img_n; - } - free(p->out); p->out = NULL; - free(p->expanded); p->expanded = NULL; - free(p->idata); p->idata = NULL; - - return result; -} - -#ifndef STBI_NO_STDIO -unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - png p; - start_file(&p.s, f); - return do_png(&p, x,y,comp,req_comp); -} - -unsigned char *stbi_png_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_png_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return data; -} -#endif - -unsigned char *stbi_png_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - png p; - start_mem(&p.s, buffer,len); - return do_png(&p, x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -int stbi_png_test_file(FILE *f) -{ - png p; - int n,r; - n = ftell(f); - start_file(&p.s, f); - r = parse_png_file(&p, SCAN_type,STBI_default); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_png_test_memory(stbi_uc const *buffer, int len) -{ - png p; - start_mem(&p.s, buffer, len); - return parse_png_file(&p, SCAN_type,STBI_default); -} - -// TODO: load header from png -#ifndef STBI_NO_STDIO -extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif -extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); - -// Microsoft/Windows BMP image - -static int bmp_test(stbi *s) -{ - int sz; - if (get8(s) != 'B') return 0; - if (get8(s) != 'M') return 0; - get32le(s); // discard filesize - get16le(s); // discard reserved - get16le(s); // discard reserved - get32le(s); // discard data offset - sz = get32le(s); - if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1; - return 0; -} - -#ifndef STBI_NO_STDIO -int stbi_bmp_test_file (FILE *f) -{ - stbi s; - int r,n = ftell(f); - start_file(&s,f); - r = bmp_test(&s); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_bmp_test_memory (stbi_uc const *buffer, int len) -{ - stbi s; - start_mem(&s, buffer, len); - return bmp_test(&s); -} - -// returns 0..31 for the highest set bit -static int high_bit(unsigned int z) -{ - int n=0; - if (z == 0) return -1; - if (z >= 0x10000) n += 16, z >>= 16; - if (z >= 0x00100) n += 8, z >>= 8; - if (z >= 0x00010) n += 4, z >>= 4; - if (z >= 0x00004) n += 2, z >>= 2; - if (z >= 0x00002) n += 1, z >>= 1; - return n; -} - -static int bitcount(unsigned int a) -{ - a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 - a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 - a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits - a = (a + (a >> 8)); // max 16 per 8 bits - a = (a + (a >> 16)); // max 32 per 8 bits - return a & 0xff; -} - -static int shiftsigned(int v, int shift, int bits) -{ - int result; - int z=0; - - if (shift < 0) v <<= -shift; - else v >>= shift; - result = v; - - z = bits; - while (z < 8) { - result += v >> z; - z += bits; - } - return result; -} - -static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp) -{ - uint8 *out; - unsigned int mr=0,mg=0,mb=0,ma=0; - stbi_uc pal[256][4]; - int psize=0,i,j,compress=0,width; - int bpp, flip_vertically, pad, target, offset, hsz; - if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP", "Corrupt BMP"); - get32le(s); // discard filesize - get16le(s); // discard reserved - get16le(s); // discard reserved - offset = get32le(s); - hsz = get32le(s); - if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown"); - failure_reason = "bad BMP"; - if (hsz == 12) { - s->img_x = get16le(s); - s->img_y = get16le(s); - } else { - s->img_x = get32le(s); - s->img_y = get32le(s); - } - if (get16le(s) != 1) return 0; - bpp = get16le(s); - if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit"); - flip_vertically = ((int) s->img_y) > 0; - s->img_y = abs((int) s->img_y); - if (hsz == 12) { - if (bpp < 24) - psize = (offset - 14 - 24) / 3; - } else { - compress = get32le(s); - if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE"); - get32le(s); // discard sizeof - get32le(s); // discard hres - get32le(s); // discard vres - get32le(s); // discard colorsused - get32le(s); // discard max important - if (hsz == 40 || hsz == 56) { - if (hsz == 56) { - get32le(s); - get32le(s); - get32le(s); - get32le(s); - } - if (bpp == 16 || bpp == 32) { - mr = mg = mb = 0; - if (compress == 0) { - if (bpp == 32) { - mr = 0xff << 16; - mg = 0xff << 8; - mb = 0xff << 0; - } else { - mr = 31 << 10; - mg = 31 << 5; - mb = 31 << 0; - } - } else if (compress == 3) { - mr = get32le(s); - mg = get32le(s); - mb = get32le(s); - // not documented, but generated by photoshop and handled by mspaint - if (mr == mg && mg == mb) { - // ?!?!? - return NULL; - } - } else - return NULL; - } - } else { - assert(hsz == 108); - mr = get32le(s); - mg = get32le(s); - mb = get32le(s); - ma = get32le(s); - get32le(s); // discard color space - for (i=0; i < 12; ++i) - get32le(s); // discard color space parameters - } - if (bpp < 16) - psize = (offset - 14 - hsz) >> 2; - } - s->img_n = ma ? 4 : 3; - if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 - target = req_comp; - else - target = s->img_n; // if they want monochrome, we'll post-convert - out = (stbi_uc *) malloc(target * s->img_x * s->img_y); - if (!out) return epuc("outofmem", "Out of memory"); - if (bpp < 16) { - int z=0; - if (psize == 0 || psize > 256) { free(out); return epuc("invalid", "Corrupt BMP"); } - for (i=0; i < psize; ++i) { - pal[i][2] = get8(s); - pal[i][1] = get8(s); - pal[i][0] = get8(s); - if (hsz != 12) get8(s); - pal[i][3] = 255; - } - skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4)); - if (bpp == 4) width = (s->img_x + 1) >> 1; - else if (bpp == 8) width = s->img_x; - else { free(out); return epuc("bad bpp", "Corrupt BMP"); } - pad = (-width)&3; - for (j=0; j < (int) s->img_y; ++j) { - for (i=0; i < (int) s->img_x; i += 2) { - int v=get8(s),v2=0; - if (bpp == 4) { - v2 = v & 15; - v >>= 4; - } - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - if (i+1 == (int) s->img_x) break; - v = (bpp == 8) ? get8(s) : v2; - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - } - skip(s, pad); - } - } else { - int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; - int z = 0; - int easy=0; - skip(s, offset - 14 - hsz); - if (bpp == 24) width = 3 * s->img_x; - else if (bpp == 16) width = 2*s->img_x; - else /* bpp = 32 and pad = 0 */ width=0; - pad = (-width) & 3; - if (bpp == 24) { - easy = 1; - } else if (bpp == 32) { - if (mb == 0xff && mg == 0xff00 && mr == 0xff000000 && ma == 0xff000000) - easy = 2; - } - if (!easy) { - if (!mr || !mg || !mb) return epuc("bad masks", "Corrupt BMP"); - // right shift amt to put high bit in position #7 - rshift = high_bit(mr)-7; rcount = bitcount(mr); - gshift = high_bit(mg)-7; gcount = bitcount(mr); - bshift = high_bit(mb)-7; bcount = bitcount(mr); - ashift = high_bit(ma)-7; acount = bitcount(mr); - } - for (j=0; j < (int) s->img_y; ++j) { - if (easy) { - for (i=0; i < (int) s->img_x; ++i) { - int a; - out[z+2] = get8(s); - out[z+1] = get8(s); - out[z+0] = get8(s); - z += 3; - a = (easy == 2 ? get8(s) : 255); - if (target == 4) out[z++] = a; - } - } else { - for (i=0; i < (int) s->img_x; ++i) { - uint32 v = (bpp == 16 ? get16le(s) : get32le(s)); - int a; - out[z++] = shiftsigned(v & mr, rshift, rcount); - out[z++] = shiftsigned(v & mg, gshift, gcount); - out[z++] = shiftsigned(v & mb, bshift, bcount); - a = (ma ? shiftsigned(v & ma, ashift, acount) : 255); - if (target == 4) out[z++] = a; - } - } - skip(s, pad); - } - } - if (flip_vertically) { - stbi_uc t; - for (j=0; j < (int) s->img_y>>1; ++j) { - stbi_uc *p1 = out + j *s->img_x*target; - stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; - for (i=0; i < (int) s->img_x*target; ++i) { - t = p1[i], p1[i] = p2[i], p2[i] = t; - } - } - } - - if (req_comp && req_comp != target) { - out = convert_format(out, target, req_comp, s->img_x, s->img_y); - if (out == NULL) return out; // convert_format frees input on failure - } - - *x = s->img_x; - *y = s->img_y; - if (comp) *comp = target; - return out; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_bmp_load_from_file(f, x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_file(&s, f); - return bmp_load(&s, x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_mem(&s, buffer, len); - return bmp_load(&s, x,y,comp,req_comp); -} - -// Targa Truevision - TGA -// by Jonathan Dummer - -static int tga_test(stbi *s) -{ - int sz; - get8u(s); // discard Offset - sz = get8u(s); // color type - if( sz > 1 ) return 0; // only RGB or indexed allowed - sz = get8u(s); // image type - if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE - get16(s); // discard palette start - get16(s); // discard palette length - get8(s); // discard bits per palette color entry - get16(s); // discard x origin - get16(s); // discard y origin - if( get16(s) < 1 ) return 0; // test width - if( get16(s) < 1 ) return 0; // test height - sz = get8(s); // bits per pixel - if( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0; // only RGB or RGBA or grey allowed - return 1; // seems to have passed everything -} - -#ifndef STBI_NO_STDIO -int stbi_tga_test_file (FILE *f) -{ - stbi s; - int r,n = ftell(f); - start_file(&s, f); - r = tga_test(&s); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_tga_test_memory (stbi_uc const *buffer, int len) -{ - stbi s; - start_mem(&s, buffer, len); - return tga_test(&s); -} - -static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp) -{ - // read in the TGA header stuff - int tga_offset = get8u(s); - int tga_indexed = get8u(s); - int tga_image_type = get8u(s); - int tga_is_RLE = 0; - int tga_palette_start = get16le(s); - int tga_palette_len = get16le(s); - int tga_palette_bits = get8u(s); - int tga_x_origin = get16le(s); - int tga_y_origin = get16le(s); - int tga_width = get16le(s); - int tga_height = get16le(s); - int tga_bits_per_pixel = get8u(s); - int tga_inverted = get8u(s); - // image data - unsigned char *tga_data; - unsigned char *tga_palette = NULL; - int i, j; - unsigned char raw_data[4]; - unsigned char trans_data[4]; - int RLE_count = 0; - int RLE_repeating = 0; - int read_next_pixel = 1; - // do a tiny bit of precessing - if( tga_image_type >= 8 ) - { - tga_image_type -= 8; - tga_is_RLE = 1; - } - /* int tga_alpha_bits = tga_inverted & 15; */ - tga_inverted = 1 - ((tga_inverted >> 5) & 1); - - // error check - if( //(tga_indexed) || - (tga_width < 1) || (tga_height < 1) || - (tga_image_type < 1) || (tga_image_type > 3) || - ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) && - (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)) - ) - { - return NULL; - } - - // If I'm paletted, then I'll use the number of bits from the palette - if( tga_indexed ) - { - tga_bits_per_pixel = tga_palette_bits; - } - - // tga info - *x = tga_width; - *y = tga_height; - if( (req_comp < 1) || (req_comp > 4) ) - { - // just use whatever the file was - req_comp = tga_bits_per_pixel / 8; - *comp = req_comp; - } else - { - // force a new number of components - *comp = tga_bits_per_pixel/8; - } - tga_data = (unsigned char*)malloc( tga_width * tga_height * req_comp ); - - // skip to the data's starting position (offset usually = 0) - skip(s, tga_offset ); - // do I need to load a palette? - if( tga_indexed ) - { - // any data to skip? (offset usually = 0) - skip(s, tga_palette_start ); - // load the palette - tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 ); - getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 ); - } - // load the data - for( i = 0; i < tga_width * tga_height; ++i ) - { - // if I'm in RLE mode, do I need to get a RLE chunk? - if( tga_is_RLE ) - { - if( RLE_count == 0 ) - { - // yep, get the next byte as a RLE command - int RLE_cmd = get8u(s); - RLE_count = 1 + (RLE_cmd & 127); - RLE_repeating = RLE_cmd >> 7; - read_next_pixel = 1; - } else if( !RLE_repeating ) - { - read_next_pixel = 1; - } - } else - { - read_next_pixel = 1; - } - // OK, if I need to read a pixel, do it now - if( read_next_pixel ) - { - // load however much data we did have - if( tga_indexed ) - { - // read in 1 byte, then perform the lookup - int pal_idx = get8u(s); - if( pal_idx >= tga_palette_len ) - { - // invalid index - pal_idx = 0; - } - pal_idx *= tga_bits_per_pixel / 8; - for( j = 0; j*8 < tga_bits_per_pixel; ++j ) - { - raw_data[j] = tga_palette[pal_idx+j]; - } - } else - { - // read in the data raw - for( j = 0; j*8 < tga_bits_per_pixel; ++j ) - { - raw_data[j] = get8u(s); - } - } - // convert raw to the intermediate format - switch( tga_bits_per_pixel ) - { - case 8: - // Luminous => RGBA - trans_data[0] = raw_data[0]; - trans_data[1] = raw_data[0]; - trans_data[2] = raw_data[0]; - trans_data[3] = 255; - break; - case 16: - // Luminous,Alpha => RGBA - trans_data[0] = raw_data[0]; - trans_data[1] = raw_data[0]; - trans_data[2] = raw_data[0]; - trans_data[3] = raw_data[1]; - break; - case 24: - // BGR => RGBA - trans_data[0] = raw_data[2]; - trans_data[1] = raw_data[1]; - trans_data[2] = raw_data[0]; - trans_data[3] = 255; - break; - case 32: - // BGRA => RGBA - trans_data[0] = raw_data[2]; - trans_data[1] = raw_data[1]; - trans_data[2] = raw_data[0]; - trans_data[3] = raw_data[3]; - break; - } - // clear the reading flag for the next pixel - read_next_pixel = 0; - } // end of reading a pixel - // convert to final format - switch( req_comp ) - { - case 1: - // RGBA => Luminance - tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]); - break; - case 2: - // RGBA => Luminance,Alpha - tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]); - tga_data[i*req_comp+1] = trans_data[3]; - break; - case 3: - // RGBA => RGB - tga_data[i*req_comp+0] = trans_data[0]; - tga_data[i*req_comp+1] = trans_data[1]; - tga_data[i*req_comp+2] = trans_data[2]; - break; - case 4: - // RGBA => RGBA - tga_data[i*req_comp+0] = trans_data[0]; - tga_data[i*req_comp+1] = trans_data[1]; - tga_data[i*req_comp+2] = trans_data[2]; - tga_data[i*req_comp+3] = trans_data[3]; - break; - } - // in case we're in RLE mode, keep counting down - --RLE_count; - } - // do I need to invert the image? - if( tga_inverted ) - { - for( j = 0; j*2 < tga_height; ++j ) - { - int index1 = j * tga_width * req_comp; - int index2 = (tga_height - 1 - j) * tga_width * req_comp; - for( i = tga_width * req_comp; i > 0; --i ) - { - unsigned char temp = tga_data[index1]; - tga_data[index1] = tga_data[index2]; - tga_data[index2] = temp; - ++index1; - ++index2; - } - } - } - // clear my palette, if I had one - if( tga_palette != NULL ) - { - free( tga_palette ); - } - // the things I do to get rid of an error message, and yet keep - // Microsoft's C compilers happy... [8^( - tga_palette_start = tga_palette_len = tga_palette_bits = - tga_x_origin = tga_y_origin = 0; - // OK, done - return tga_data; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_tga_load_from_file(f, x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_file(&s, f); - return tga_load(&s, x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_mem(&s, buffer, len); - return tga_load(&s, x,y,comp,req_comp); -} - - -// ************************************************************************************************* -// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicholas Schulz, tweaked by STB - -static int psd_test(stbi *s) -{ - if (get32(s) != 0x38425053) return 0; // "8BPS" - else return 1; -} - -#ifndef STBI_NO_STDIO -int stbi_psd_test_file(FILE *f) -{ - stbi s; - int r,n = ftell(f); - start_file(&s, f); - r = psd_test(&s); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_psd_test_memory(stbi_uc const *buffer, int len) -{ - stbi s; - start_mem(&s, buffer, len); - return psd_test(&s); -} - -static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp) -{ - int pixelCount; - int channelCount, compression; - int channel, i, count, len; - int w,h; - uint8 *out; - - // Check identifier - if (get32(s) != 0x38425053) // "8BPS" - return epuc("not PSD", "Corrupt PSD image"); - - // Check file type version. - if (get16(s) != 1) - return epuc("wrong version", "Unsupported version of PSD image"); - - // Skip 6 reserved bytes. - skip(s, 6 ); - - // Read the number of channels (R, G, B, A, etc). - channelCount = get16(s); - if (channelCount < 0 || channelCount > 16) - return epuc("wrong channel count", "Unsupported number of channels in PSD image"); - - // Read the rows and columns of the image. - h = get32(s); - w = get32(s); - - // Make sure the depth is 8 bits. - if (get16(s) != 8) - return epuc("unsupported bit depth", "PSD bit depth is not 8 bit"); - - // Make sure the color mode is RGB. - // Valid options are: - // 0: Bitmap - // 1: Grayscale - // 2: Indexed color - // 3: RGB color - // 4: CMYK color - // 7: Multichannel - // 8: Duotone - // 9: Lab color - if (get16(s) != 3) - return epuc("wrong color format", "PSD is not in RGB color format"); - - // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) - skip(s,get32(s) ); - - // Skip the image resources. (resolution, pen tool paths, etc) - skip(s, get32(s) ); - - // Skip the reserved data. - skip(s, get32(s) ); - - // Find out if the data is compressed. - // Known values: - // 0: no compression - // 1: RLE compressed - compression = get16(s); - if (compression > 1) - return epuc("bad compression", "PSD has an unknown compression format"); - - // Create the destination image. - out = (stbi_uc *) malloc(4 * w*h); - if (!out) return epuc("outofmem", "Out of memory"); - pixelCount = w*h; - - // Initialize the data to zero. - //memset( out, 0, pixelCount * 4 ); - - // Finally, the image data. - if (compression) { - // RLE as used by .PSD and .TIFF - // Loop until you get the number of unpacked bytes you are expecting: - // Read the next source byte into n. - // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. - // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. - // Else if n is 128, noop. - // Endloop - - // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, - // which we're going to just skip. - skip(s, h * channelCount * 2 ); - - // Read the RLE data by channel. - for (channel = 0; channel < 4; channel++) { - uint8 *p; - - p = out+channel; - if (channel >= channelCount) { - // Fill this channel with default data. - for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4; - } else { - // Read the RLE data. - count = 0; - while (count < pixelCount) { - len = get8(s); - if (len == 128) { - // No-op. - } else if (len < 128) { - // Copy next len+1 bytes literally. - len++; - count += len; - while (len) { - *p = get8(s); - p += 4; - len--; - } - } else if (len > 128) { - uint32 val; - // Next -len+1 bytes in the dest are replicated from next source byte. - // (Interpret len as a negative 8-bit int.) - len ^= 0x0FF; - len += 2; - val = get8(s); - count += len; - while (len) { - *p = val; - p += 4; - len--; - } - } - } - } - } - - } else { - // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) - // where each channel consists of an 8-bit value for each pixel in the image. - - // Read the data by channel. - for (channel = 0; channel < 4; channel++) { - uint8 *p; - - p = out + channel; - if (channel > channelCount) { - // Fill this channel with default data. - for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4; - } else { - // Read the data. - count = 0; - for (i = 0; i < pixelCount; i++) - *p = get8(s), p += 4; - } - } - } - - if (req_comp && req_comp != 4) { - out = convert_format(out, 4, req_comp, w, h); - if (out == NULL) return out; // convert_format frees input on failure - } - - if (comp) *comp = channelCount; - *y = h; - *x = w; - - return out; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_psd_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_psd_load_from_file(f, x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_psd_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_file(&s, f); - return psd_load(&s, x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_mem(&s, buffer, len); - return psd_load(&s, x,y,comp,req_comp); -} - - -// ************************************************************************************************* -// Radiance RGBE HDR loader -// originally by Nicolas Schulz -#ifndef STBI_NO_HDR -static int hdr_test(stbi *s) -{ - char *signature = "#?RADIANCE\n"; - int i; - for (i=0; signature[i]; ++i) - if (get8(s) != signature[i]) - return 0; - return 1; -} - -int stbi_hdr_test_memory(stbi_uc const *buffer, int len) -{ - stbi s; - start_mem(&s, buffer, len); - return hdr_test(&s); -} - -#ifndef STBI_NO_STDIO -int stbi_hdr_test_file(FILE *f) -{ - stbi s; - int r,n = ftell(f); - start_file(&s, f); - r = hdr_test(&s); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -#define HDR_BUFLEN 1024 -static char *hdr_gettoken(stbi *z, char *buffer) -{ - int len=0; - char c = '\0'; - - c = get8(z); - - while (!at_eof(z) && c != '\n') { - buffer[len++] = c; - if (len == HDR_BUFLEN-1) { - // flush to end of line - while (!at_eof(z) && get8(z) != '\n') - ; - break; - } - c = get8(z); - } - - buffer[len] = 0; - return buffer; -} - -static void hdr_convert(float *output, stbi_uc *input, int req_comp) -{ - if( input[3] != 0 ) { - float f1; - // Exponent - f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); - if (req_comp <= 2) - output[0] = (input[0] + input[1] + input[2]) * f1 / 3; - else { - output[0] = input[0] * f1; - output[1] = input[1] * f1; - output[2] = input[2] * f1; - } - if (req_comp == 2) output[1] = 1; - if (req_comp == 4) output[3] = 1; - } else { - switch (req_comp) { - case 4: output[3] = 1; /* fallthrough */ - case 3: output[0] = output[1] = output[2] = 0; - break; - case 2: output[1] = 1; /* fallthrough */ - case 1: output[0] = 0; - break; - } - } -} - - -static float *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp) -{ - char buffer[HDR_BUFLEN]; - char *token; - int valid = 0; - int width, height; - stbi_uc *scanline; - float *hdr_data; - int len; - unsigned char count, value; - int i, j, k, c1,c2, z; - - - // Check identifier - if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0) - return epf("not HDR", "Corrupt HDR image"); - - // Parse header - while(1) { - token = hdr_gettoken(s,buffer); - if (token[0] == 0) break; - if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; - } - - if (!valid) return epf("unsupported format", "Unsupported HDR format"); - - // Parse width and height - // can't use sscanf() if we're not using stdio! - token = hdr_gettoken(s,buffer); - if (strncmp(token, "-Y ", 3)) return epf("unsupported data layout", "Unsupported HDR format"); - token += 3; - height = strtol(token, &token, 10); - while (*token == ' ') ++token; - if (strncmp(token, "+X ", 3)) return epf("unsupported data layout", "Unsupported HDR format"); - token += 3; - width = strtol(token, NULL, 10); - - *x = width; - *y = height; - - *comp = 3; - if (req_comp == 0) req_comp = 3; - - // Read data - hdr_data = (float *) malloc(height * width * req_comp * sizeof(float)); - - // Load image data - // image data is stored as some number of sca - if( width < 8 || width >= 32768) { - // Read flat data - for (j=0; j < height; ++j) { - for (i=0; i < width; ++i) { - stbi_uc rgbe[4]; -main_decode_loop: - getn(s, rgbe, 4); - hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); - } - } - } else { - // Read RLE-encoded data - scanline = NULL; - - for (j = 0; j < height; ++j) { - c1 = get8(s); - c2 = get8(s); - len = get8(s); - if (c1 != 2 || c2 != 2 || (len & 0x80)) { - // not run-length encoded, so we have to actually use THIS data as a decoded - // pixel (note this can't be a valid pixel--one of RGB must be >= 128) - stbi_uc rgbe[4] = { c1,c2,len, get8(s) }; - hdr_convert(hdr_data, rgbe, req_comp); - i = 1; - j = 0; - free(scanline); - goto main_decode_loop; // yes, this is fucking insane; blame the fucking insane format - } - len <<= 8; - len |= get8(s); - if (len != width) { free(hdr_data); free(scanline); return epf("invalid decoded scanline length", "corrupt HDR"); } - if (scanline == NULL) scanline = (stbi_uc *) malloc(width * 4); - - for (k = 0; k < 4; ++k) { - i = 0; - while (i < width) { - count = get8(s); - if (count > 128) { - // Run - value = get8(s); - count -= 128; - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = value; - } else { - // Dump - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = get8(s); - } - } - } - for (i=0; i < width; ++i) - hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); - } - free(scanline); - } - - return hdr_data; -} - -#ifndef STBI_NO_STDIO -float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_file(&s,f); - return hdr_load(&s,x,y,comp,req_comp); -} -#endif - -float *stbi_hdr_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi s; - start_mem(&s,buffer, len); - return hdr_load(&s,x,y,comp,req_comp); -} - -#endif // STBI_NO_HDR - -/////////////////////// write image /////////////////////// - -#ifndef STBI_NO_WRITE - -static void write8(FILE *f, int x) { uint8 z = (uint8) x; fwrite(&z,1,1,f); } - -static void writefv(FILE *f, char *fmt, va_list v) -{ - while (*fmt) { - switch (*fmt++) { - case ' ': break; - case '1': { uint8 x = va_arg(v, int); write8(f,x); break; } - case '2': { int16 x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; } - case '4': { int32 x = va_arg(v, int); write8(f,x); write8(f,x>>8); write8(f,x>>16); write8(f,x>>24); break; } - default: - assert(0); - va_end(v); - return; - } - } -} - -static void writef(FILE *f, char *fmt, ...) -{ - va_list v; - va_start(v, fmt); - writefv(f,fmt,v); - va_end(v); -} - -static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad) -{ - uint8 bg[3] = { 255, 0, 255}, px[3]; - uint32 zero = 0; - int i,j,k, j_end; - - if (vdir < 0) - j_end = -1, j = y-1; - else - j_end = y, j = 0; - - for (; j != j_end; j += vdir) { - for (i=0; i < x; ++i) { - uint8 *d = (uint8 *) data + (j*x+i)*comp; - if (write_alpha < 0) - fwrite(&d[comp-1], 1, 1, f); - switch (comp) { - case 1: - case 2: writef(f, "111", d[0],d[0],d[0]); - break; - case 4: - if (!write_alpha) { - for (k=0; k < 3; ++k) - px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255; - writef(f, "111", px[1-rgb_dir],px[1],px[1+rgb_dir]); - break; - } - /* FALLTHROUGH */ - case 3: - writef(f, "111", d[1-rgb_dir],d[1],d[1+rgb_dir]); - break; - } - if (write_alpha > 0) - fwrite(&d[comp-1], 1, 1, f); - } - fwrite(&zero,scanline_pad,1,f); - } -} - -static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, char *fmt, ...) -{ - FILE *f = fopen(filename, "wb"); - if (f) { - va_list v; - va_start(v, fmt); - writefv(f, fmt, v); - va_end(v); - write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad); - fclose(f); - } - return f != NULL; -} - -int stbi_write_bmp(char const *filename, int x, int y, int comp, void *data) -{ - int pad = (-x*3) & 3; - return outfile(filename,-1,-1,x,y,comp,data,0,pad, - "11 4 22 4" "4 44 22 444444", - 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header - 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header -} - -int stbi_write_tga(char const *filename, int x, int y, int comp, void *data) -{ - int has_alpha = !(comp & 1); - return outfile(filename, -1,-1, x, y, comp, data, has_alpha, 0, - "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha); -} - -// any other image formats that do interleaved rgb data? -// PNG: requires adler32,crc32 -- significant amount of code -// PSD: no, channels output separately -// TIFF: no, stripwise-interleaved... i think - -#endif // STBI_NO_WRITE - -#endif // STBI_HEADER_FILE_ONLY diff --git a/3party/stb_image/stb_image.cpp b/3party/stb_image/stb_image.cpp new file mode 100644 index 0000000000..82928fa0fb --- /dev/null +++ b/3party/stb_image/stb_image.cpp @@ -0,0 +1,5 @@ +#define STB_IMAGE_IMPLEMENTATION +#include "stb_image.h" + +#define STB_IMAGE_WRITE_IMPLEMENTATION +#include "stb_image_write.h" diff --git a/3party/stb_image/stb_image.h b/3party/stb_image/stb_image.h index 172925126c..a125be99c9 100644..100755 --- a/3party/stb_image/stb_image.h +++ b/3party/stb_image/stb_image.h @@ -1,102 +1,246 @@ -/* stbi-1.14 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c - when you control the images you're loading +/* stb_image - v2.13 - public domain image loader - http://nothings.org/stb_image.h + no warranty implied; use at your own risk + + Do this: + #define STB_IMAGE_IMPLEMENTATION + before you include this file in *one* C or C++ file to create the implementation. + + // i.e. it should look like this: + #include ... + #include ... + #include ... + #define STB_IMAGE_IMPLEMENTATION + #include "stb_image.h" + + You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. + And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free + QUICK NOTES: Primarily of interest to game developers and other people who can avoid problematic images and only need the trivial interface - JPEG baseline (no JPEG progressive, no oddball channel decimations) - PNG non-interlaced - BMP non-1bpp, non-RLE + JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) + PNG 1/2/4/8-bit-per-channel (16 bpc not supported) + TGA (not sure what subset, if a subset) - PSD (composited view only, no extra channels) + BMP non-1bpp, non-RLE + PSD (composited view only, no extra channels, 8/16 bit-per-channel) + + GIF (*comp always reports as 4-channel) HDR (radiance rgbE format) - writes BMP,TGA (define STBI_NO_WRITE to remove code) - decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) - supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) - - TODO: - stbi_info_* - - history: - 1.14 fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including) - 1.13 threadsafe - 1.12 const qualifiers in the API - 1.11 Support installable IDCT, colorspace conversion routines - 1.10 Fixes for 64-bit (don't use "unsigned long") - optimized upsampling by Fabian "ryg" Giesen - 1.09 Fix format-conversion for PSD code (bad global variables!) - 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz - 1.07 attempt to fix C++ warning/errors again - 1.06 attempt to fix C++ warning/errors again - 1.05 fix TGA loading to return correct *comp and use good luminance calc - 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free - 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR - 1.02 support for (subset of) HDR files, float interface for preferred access to them - 1.01 fix bug: possible bug in handling right-side up bmps... not sure - fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less - than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant -*/ + PIC (Softimage PIC) + PNM (PPM and PGM binary only) + + Animated GIF still needs a proper API, but here's one way to do it: + http://gist.github.com/urraka/685d9a6340b26b830d49 + + - decode from memory or through FILE (define STBI_NO_STDIO to remove code) + - decode from arbitrary I/O callbacks + - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) + + Full documentation under "DOCUMENTATION" below. + + + Revision 2.00 release notes: + + - Progressive JPEG is now supported. + + - PPM and PGM binary formats are now supported, thanks to Ken Miller. + + - x86 platforms now make use of SSE2 SIMD instructions for + JPEG decoding, and ARM platforms can use NEON SIMD if requested. + This work was done by Fabian "ryg" Giesen. SSE2 is used by + default, but NEON must be enabled explicitly; see docs. + + With other JPEG optimizations included in this version, we see + 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup + on a JPEG on an ARM machine, relative to previous versions of this + library. The same results will not obtain for all JPGs and for all + x86/ARM machines. (Note that progressive JPEGs are significantly + slower to decode than regular JPEGs.) This doesn't mean that this + is the fastest JPEG decoder in the land; rather, it brings it + closer to parity with standard libraries. If you want the fastest + decode, look elsewhere. (See "Philosophy" section of docs below.) + + See final bullet items below for more info on SIMD. + + - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing + the memory allocator. Unlike other STBI libraries, these macros don't + support a context parameter, so if you need to pass a context in to + the allocator, you'll have to store it in a global or a thread-local + variable. + + - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and + STBI_NO_LINEAR. + STBI_NO_HDR: suppress implementation of .hdr reader format + STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API + + - You can suppress implementation of any of the decoders to reduce + your code footprint by #defining one or more of the following + symbols before creating the implementation. + + STBI_NO_JPEG + STBI_NO_PNG + STBI_NO_BMP + STBI_NO_PSD + STBI_NO_TGA + STBI_NO_GIF + STBI_NO_HDR + STBI_NO_PIC + STBI_NO_PNM (.ppm and .pgm) + + - You can request *only* certain decoders and suppress all other ones + (this will be more forward-compatible, as addition of new decoders + doesn't require you to disable them explicitly): + + STBI_ONLY_JPEG + STBI_ONLY_PNG + STBI_ONLY_BMP + STBI_ONLY_PSD + STBI_ONLY_TGA + STBI_ONLY_GIF + STBI_ONLY_HDR + STBI_ONLY_PIC + STBI_ONLY_PNM (.ppm and .pgm) + + Note that you can define multiples of these, and you will get all + of them ("only x" and "only y" is interpreted to mean "only x&y"). + + - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still + want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB + + - Compilation of all SIMD code can be suppressed with + #define STBI_NO_SIMD + It should not be necessary to disable SIMD unless you have issues + compiling (e.g. using an x86 compiler which doesn't support SSE + intrinsics or that doesn't support the method used to detect + SSE2 support at run-time), and even those can be reported as + bugs so I can refine the built-in compile-time checking to be + smarter. + + - The old STBI_SIMD system which allowed installing a user-defined + IDCT etc. has been removed. If you need this, don't upgrade. My + assumption is that almost nobody was doing this, and those who + were will find the built-in SIMD more satisfactory anyway. + + - RGB values computed for JPEG images are slightly different from + previous versions of stb_image. (This is due to using less + integer precision in SIMD.) The C code has been adjusted so + that the same RGB values will be computed regardless of whether + SIMD support is available, so your app should always produce + consistent results. But these results are slightly different from + previous versions. (Specifically, about 3% of available YCbCr values + will compute different RGB results from pre-1.49 versions by +-1; + most of the deviating values are one smaller in the G channel.) + + - If you must produce consistent results with previous versions of + stb_image, #define STBI_JPEG_OLD and you will get the same results + you used to; however, you will not get the SIMD speedups for + the YCbCr-to-RGB conversion step (although you should still see + significant JPEG speedup from the other changes). + + Please note that STBI_JPEG_OLD is a temporary feature; it will be + removed in future versions of the library. It is only intended for + near-term back-compatibility use. + + + Latest revision history: + 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 + RGB-format JPEG; remove white matting in PSD; + allocate large structures on the stack; + correct channel count for PNG & BMP + 2.10 (2016-01-22) avoid warning introduced in 2.09 + 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA + 2.07 (2015-09-13) partial animated GIF support + limited 16-bit PSD support + minor bugs, code cleanup, and compiler warnings + + See end of file for full revision history. + + + ============================ Contributors ========================= + + Image formats Extensions, features + Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) + Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) + Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) + Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) + Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) + Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) + Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) + urraka@github (animated gif) Junggon Kim (PNM comments) + Daniel Gibson (16-bit TGA) + + Optimizations & bugfixes + Fabian "ryg" Giesen + Arseny Kapoulkine + + Bug & warning fixes + Marc LeBlanc David Woo Guillaume George Martins Mozeiko + Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson + Dave Moore Roy Eltham Hayaki Saito Phil Jordan + Won Chun Luke Graham Johan Duparc Nathan Reed + the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis + Janez Zemva John Bartholomew Michal Cichon svdijk@github + Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson + Laurent Gomila Cort Stratton Sergio Gonzalez romigrou@github + Aruelien Pocheville Thibault Reuille Cass Everitt Matthew Gregan + Ryamond Barbiero Paul Du Bois Engin Manap snagar@github + Michaelangel007@github Oriol Ferrer Mesia socks-the-fox Zelex@github + Philipp Wiesemann Josh Tobin rlyeh@github grim210@github + Blazej Dariusz Roszkowski + + +LICENSE +This software is dual-licensed to the public domain and under the following +license: you are granted a perpetual, irrevocable license to copy, modify, +publish, and distribute this file as you see fit. + +*/ #ifndef STBI_INCLUDE_STB_IMAGE_H #define STBI_INCLUDE_STB_IMAGE_H -//// begin header file //////////////////////////////////////////////////// +// DOCUMENTATION // // Limitations: -// - no progressive/interlaced support (jpeg, png) -// - 8-bit samples only (jpeg, png) -// - not threadsafe -// - channel subsampling of at most 2 in each dimension (jpeg) -// - no delayed line count (jpeg) -- IJG doesn't support either +// - no 16-bit-per-channel PNG +// - no 12-bit-per-channel JPEG +// - no JPEGs with arithmetic coding +// - no 1-bit BMP +// - GIF always returns *comp=4 // -// Basic usage (see HDR discussion below): +// Basic usage (see HDR discussion below for HDR usage): // int x,y,n; // unsigned char *data = stbi_load(filename, &x, &y, &n, 0); // // ... process data if not NULL ... // // ... x = width, y = height, n = # 8-bit components per pixel ... // // ... replace '0' with '1'..'4' to force that many components per pixel +// // ... but 'n' will always be the number that it would have been if you said 0 // stbi_image_free(data) // // Standard parameters: -// int *x -- outputs image width in pixels -// int *y -- outputs image height in pixels -// int *comp -- outputs # of image components in image file -// int req_comp -- if non-zero, # of image components requested in result +// int *x -- outputs image width in pixels +// int *y -- outputs image height in pixels +// int *channels_in_file -- outputs # of image components in image file +// int desired_channels -- if non-zero, # of image components requested in result // // The return value from an image loader is an 'unsigned char *' which points -// to the pixel data. The pixel data consists of *y scanlines of *x pixels, +// to the pixel data, or NULL on an allocation failure or if the image is +// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, // with each pixel consisting of N interleaved 8-bit components; the first // pixel pointed to is top-left-most in the image. There is no padding between // image scanlines or between pixels, regardless of format. The number of // components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. // If req_comp is non-zero, *comp has the number of components that _would_ // have been output otherwise. E.g. if you set req_comp to 4, you will always -// get RGBA output, but you can check *comp to easily see if it's opaque. +// get RGBA output, but you can check *comp to see if it's trivially opaque +// because e.g. there were only 3 channels in the source image. // // An output image with N components has the following components interleaved // in this order in each pixel: @@ -114,8 +258,70 @@ // compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly // more user-friendly ones. // -// Paletted PNG and BMP images are automatically depalettized. +// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. +// +// =========================================================================== +// +// Philosophy +// +// stb libraries are designed with the following priorities: +// +// 1. easy to use +// 2. easy to maintain +// 3. good performance +// +// Sometimes I let "good performance" creep up in priority over "easy to maintain", +// and for best performance I may provide less-easy-to-use APIs that give higher +// performance, in addition to the easy to use ones. Nevertheless, it's important +// to keep in mind that from the standpoint of you, a client of this library, +// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all. +// +// Some secondary priorities arise directly from the first two, some of which +// make more explicit reasons why performance can't be emphasized. +// +// - Portable ("ease of use") +// - Small footprint ("easy to maintain") +// - No dependencies ("ease of use") +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). +// +// =========================================================================== +// +// SIMD support +// +// The JPEG decoder will try to automatically use SIMD kernels on x86 when +// supported by the compiler. For ARM Neon support, you must explicitly +// request it. +// +// (The old do-it-yourself SIMD API is no longer supported in the current +// code.) +// +// On x86, SSE2 will automatically be used when available based on a run-time +// test; if not, the generic C versions are used as a fall-back. On ARM targets, +// the typical path is to have separate builds for NEON and non-NEON devices +// (at least this is true for iOS and Android). Therefore, the NEON support is +// toggled by a build flag: define STBI_NEON to get NEON loops. // +// The output of the JPEG decoder is slightly different from versions where +// SIMD support was introduced (that is, for versions before 1.49). The +// difference is only +-1 in the 8-bit RGB channels, and only on a small +// fraction of pixels. You can force the pre-1.49 behavior by defining +// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path +// and hence cost some performance. +// +// If for some reason you do not want to use any of SIMD code, or if +// you have issues compiling it, you can disable it entirely by +// defining STBI_NO_SIMD. // // =========================================================================== // @@ -152,199 +358,6742 @@ // not), using: // // stbi_is_hdr(char *filename); +// +// =========================================================================== +// +// iPhone PNG support: +// +// By default we convert iphone-formatted PNGs back to RGB, even though +// they are internally encoded differently. You can disable this conversion +// by by calling stbi_convert_iphone_png_to_rgb(0), in which case +// you will always just get the native iphone "format" through (which +// is BGR stored in RGB). +// +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per +// pixel to remove any premultiplied alpha *only* if the image file explicitly +// says there's premultiplied data (currently only happens in iPhone images, +// and only if iPhone convert-to-rgb processing is on). +// + #ifndef STBI_NO_STDIO #include <stdio.h> -#endif +#endif // STBI_NO_STDIO #define STBI_VERSION 1 enum { - STBI_default = 0, // only used for req_comp + STBI_default = 0, // only used for req_comp - STBI_grey = 1, - STBI_grey_alpha = 2, - STBI_rgb = 3, - STBI_rgb_alpha = 4, + STBI_grey = 1, + STBI_grey_alpha = 2, + STBI_rgb = 3, + STBI_rgb_alpha = 4 }; typedef unsigned char stbi_uc; +typedef unsigned short stbi_us; #ifdef __cplusplus extern "C" { #endif -// WRITING API - -#if !defined(STBI_NO_WRITE) && !defined(STBI_NO_STDIO) -// write a BMP/TGA file given tightly packed 'comp' channels (no padding, nor bmp-stride-padding) -// (you must include the appropriate extension in the filename). -// returns TRUE on success, FALSE if couldn't open file, error writing file -extern int stbi_write_bmp (char const *filename, int x, int y, int comp, void *data); -extern int stbi_write_tga (char const *filename, int x, int y, int comp, void *data); +#ifdef STB_IMAGE_STATIC +#define STBIDEF static +#else +#define STBIDEF extern #endif +////////////////////////////////////////////////////////////////////////////// +// // PRIMARY API - works on images of any type +// +// // load image by filename, open file, or memory buffer +// + +typedef struct +{ + int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read + void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative + int (*eof) (void *user); // returns nonzero if we are at end of file/data +} stbi_io_callbacks; + +//////////////////////////////////// +// +// 8-bits-per-channel interface +// + +STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels); + #ifndef STBI_NO_STDIO -extern stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif -extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); // for stbi_load_from_file, file pointer is left pointing immediately after image +#endif -#ifndef STBI_NO_HDR +//////////////////////////////////// +// +// 16-bits-per-channel interface +// + +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); #ifndef STBI_NO_STDIO -extern float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp); -extern float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); #endif -extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +// @TODO the other variants -extern void stbi_hdr_to_ldr_gamma(float gamma); -extern void stbi_hdr_to_ldr_scale(float scale); +//////////////////////////////////// +// +// float-per-channel interface +// +#ifndef STBI_NO_LINEAR + STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); -extern void stbi_ldr_to_hdr_gamma(float gamma); -extern void stbi_ldr_to_hdr_scale(float scale); + #ifndef STBI_NO_STDIO + STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); + #endif +#endif +#ifndef STBI_NO_HDR + STBIDEF void stbi_hdr_to_ldr_gamma(float gamma); + STBIDEF void stbi_hdr_to_ldr_scale(float scale); #endif // STBI_NO_HDR +#ifndef STBI_NO_LINEAR + STBIDEF void stbi_ldr_to_hdr_gamma(float gamma); + STBIDEF void stbi_ldr_to_hdr_scale(float scale); +#endif // STBI_NO_LINEAR + +// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename); +STBIDEF int stbi_is_hdr_from_file(FILE *f); +#endif // STBI_NO_STDIO + + // get a VERY brief reason for failure // NOT THREADSAFE -extern char *stbi_failure_reason (void); +STBIDEF const char *stbi_failure_reason (void); // free the loaded image -- this is just free() -extern void stbi_image_free (void *retval_from_stbi_load); +STBIDEF void stbi_image_free (void *retval_from_stbi_load); // get image dimensions & components without fully decoding -extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); -extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); + #ifndef STBI_NO_STDIO -extern int stbi_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_is_hdr (char const *filename); -extern int stbi_is_hdr_from_file(FILE *f); +STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); + #endif + + +// for image formats that explicitly notate that they have premultiplied alpha, +// we just return the colors as stored in the file. set this flag to force +// unpremultiplication. results are undefined if the unpremultiply overflow. +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); + +// indicate whether we should process iphone images back to canonical format, +// or just pass them through "as-is" +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); + +// flip the image vertically, so the first pixel in the output array is the bottom left +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); + // ZLIB client - used by PNG, available for other purposes -extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); -extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); -extern int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); +STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); -extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); -extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); +STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); -// TYPE-SPECIFIC ACCESS -// is it a jpeg? -extern int stbi_jpeg_test_memory (stbi_uc const *buffer, int len); -extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); -extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); +#ifdef __cplusplus +} +#endif -#ifndef STBI_NO_STDIO -extern stbi_uc *stbi_jpeg_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern int stbi_jpeg_test_file (FILE *f); -extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +// +// +//// end header file ///////////////////////////////////////////////////// +#endif // STBI_INCLUDE_STB_IMAGE_H -extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); +#ifdef STB_IMAGE_IMPLEMENTATION + +#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ + || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ + || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ + || defined(STBI_ONLY_ZLIB) + #ifndef STBI_ONLY_JPEG + #define STBI_NO_JPEG + #endif + #ifndef STBI_ONLY_PNG + #define STBI_NO_PNG + #endif + #ifndef STBI_ONLY_BMP + #define STBI_NO_BMP + #endif + #ifndef STBI_ONLY_PSD + #define STBI_NO_PSD + #endif + #ifndef STBI_ONLY_TGA + #define STBI_NO_TGA + #endif + #ifndef STBI_ONLY_GIF + #define STBI_NO_GIF + #endif + #ifndef STBI_ONLY_HDR + #define STBI_NO_HDR + #endif + #ifndef STBI_ONLY_PIC + #define STBI_NO_PIC + #endif + #ifndef STBI_ONLY_PNM + #define STBI_NO_PNM + #endif #endif -// is it a png? -extern int stbi_png_test_memory (stbi_uc const *buffer, int len); -extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); +#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) +#define STBI_NO_ZLIB +#endif + + +#include <stdarg.h> +#include <stddef.h> // ptrdiff_t on osx +#include <stdlib.h> +#include <string.h> +#include <limits.h> + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) +#include <math.h> // ldexp +#endif #ifndef STBI_NO_STDIO -extern stbi_uc *stbi_png_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); -extern int stbi_png_test_file (FILE *f); -extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); +#include <stdio.h> #endif -// is it a bmp? -extern int stbi_bmp_test_memory (stbi_uc const *buffer, int len); +#ifndef STBI_ASSERT +#include <assert.h> +#define STBI_ASSERT(x) assert(x) +#endif -extern stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); -#ifndef STBI_NO_STDIO -extern int stbi_bmp_test_file (FILE *f); -extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); + +#ifndef _MSC_VER + #ifdef __cplusplus + #define stbi_inline inline + #else + #define stbi_inline + #endif +#else + #define stbi_inline __forceinline +#endif + + +#ifdef _MSC_VER +typedef unsigned short stbi__uint16; +typedef signed short stbi__int16; +typedef unsigned int stbi__uint32; +typedef signed int stbi__int32; +#else +#include <stdint.h> +typedef uint16_t stbi__uint16; +typedef int16_t stbi__int16; +typedef uint32_t stbi__uint32; +typedef int32_t stbi__int32; +#endif + +// should produce compiler error if size is wrong +typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1]; + +#ifdef _MSC_VER +#define STBI_NOTUSED(v) (void)(v) +#else +#define STBI_NOTUSED(v) (void)sizeof(v) +#endif + +#ifdef _MSC_VER +#define STBI_HAS_LROTL +#endif + +#ifdef STBI_HAS_LROTL + #define stbi_lrot(x,y) _lrotl(x,y) +#else + #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) +#endif + +#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) +// ok +#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." +#endif + +#ifndef STBI_MALLOC +#define STBI_MALLOC(sz) malloc(sz) +#define STBI_REALLOC(p,newsz) realloc(p,newsz) +#define STBI_FREE(p) free(p) +#endif + +#ifndef STBI_REALLOC_SIZED +#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) +#endif + +// x86/x64 detection +#if defined(__x86_64__) || defined(_M_X64) +#define STBI__X64_TARGET +#elif defined(__i386) || defined(_M_IX86) +#define STBI__X86_TARGET +#endif + +#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) +// NOTE: not clear do we actually need this for the 64-bit path? +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, +// (but compiling with -msse2 allows the compiler to use SSE2 everywhere; +// this is just broken and gcc are jerks for not fixing it properly +// http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) +#define STBI_NO_SIMD +#endif + +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET +// +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not +// simultaneously enabling "-mstackrealign". +// +// See https://github.com/nothings/stb/issues/81 for more information. +// +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. +#define STBI_NO_SIMD +#endif + +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) +#define STBI_SSE2 +#include <emmintrin.h> + +#ifdef _MSC_VER + +#if _MSC_VER >= 1400 // not VC6 +#include <intrin.h> // __cpuid +static int stbi__cpuid3(void) +{ + int info[4]; + __cpuid(info,1); + return info[3]; +} +#else +static int stbi__cpuid3(void) +{ + int res; + __asm { + mov eax,1 + cpuid + mov res,edx + } + return res; +} +#endif + +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name + +static int stbi__sse2_available() +{ + int info3 = stbi__cpuid3(); + return ((info3 >> 26) & 1) != 0; +} +#else // assume GCC-style if not VC++ +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) + +static int stbi__sse2_available() +{ +#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later + // GCC 4.8+ has a nice way to do this + return __builtin_cpu_supports("sse2"); +#else + // portable way to do this, preferably without using GCC inline ASM? + // just bail for now. + return 0; +#endif +} +#endif +#endif + +// ARM NEON +#if defined(STBI_NO_SIMD) && defined(STBI_NEON) +#undef STBI_NEON +#endif + +#ifdef STBI_NEON +#include <arm_neon.h> +// assume GCC or Clang on ARM targets +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) #endif -// is it a tga? -extern int stbi_tga_test_memory (stbi_uc const *buffer, int len); +#ifndef STBI_SIMD_ALIGN +#define STBI_SIMD_ALIGN(type, name) type name +#endif + +/////////////////////////////////////////////// +// +// stbi__context struct and start_xxx functions + +// stbi__context structure is our basic context used by all images, so it +// contains all the IO context, plus some basic image information +typedef struct +{ + stbi__uint32 img_x, img_y; + int img_n, img_out_n; + + stbi_io_callbacks io; + void *io_user_data; + + int read_from_callbacks; + int buflen; + stbi_uc buffer_start[128]; + + stbi_uc *img_buffer, *img_buffer_end; + stbi_uc *img_buffer_original, *img_buffer_original_end; +} stbi__context; + + +static void stbi__refill_buffer(stbi__context *s); + +// initialize a memory-decode context +static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) +{ + s->io.read = NULL; + s->read_from_callbacks = 0; + s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer; + s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len; +} + +// initialize a callback-based context +static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) +{ + s->io = *c; + s->io_user_data = user; + s->buflen = sizeof(s->buffer_start); + s->read_from_callbacks = 1; + s->img_buffer_original = s->buffer_start; + stbi__refill_buffer(s); + s->img_buffer_original_end = s->img_buffer_end; +} -extern stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); #ifndef STBI_NO_STDIO -extern int stbi_tga_test_file (FILE *f); -extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); + +static int stbi__stdio_read(void *user, char *data, int size) +{ + return (int) fread(data,1,size,(FILE*) user); +} + +static void stbi__stdio_skip(void *user, int n) +{ + fseek((FILE*) user, n, SEEK_CUR); +} + +static int stbi__stdio_eof(void *user) +{ + return feof((FILE*) user); +} + +static stbi_io_callbacks stbi__stdio_callbacks = +{ + stbi__stdio_read, + stbi__stdio_skip, + stbi__stdio_eof, +}; + +static void stbi__start_file(stbi__context *s, FILE *f) +{ + stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); +} + +//static void stop_file(stbi__context *s) { } + +#endif // !STBI_NO_STDIO + +static void stbi__rewind(stbi__context *s) +{ + // conceptually rewind SHOULD rewind to the beginning of the stream, + // but we just rewind to the beginning of the initial buffer, because + // we only use it after doing 'test', which only ever looks at at most 92 bytes + s->img_buffer = s->img_buffer_original; + s->img_buffer_end = s->img_buffer_original_end; +} + +enum +{ + STBI_ORDER_RGB, + STBI_ORDER_BGR +}; + +typedef struct +{ + int bits_per_channel; + int num_channels; + int channel_order; +} stbi__result_info; + +#ifndef STBI_NO_JPEG +static int stbi__jpeg_test(stbi__context *s); +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNG +static int stbi__png_test(stbi__context *s); +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_BMP +static int stbi__bmp_test(stbi__context *s); +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_TGA +static int stbi__tga_test(stbi__context *s); +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s); +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc); +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_HDR +static int stbi__hdr_test(stbi__context *s); +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_test(stbi__context *s); +static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_GIF +static int stbi__gif_test(stbi__context *s); +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNM +static int stbi__pnm_test(stbi__context *s); +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +// this is not threadsafe +static const char *stbi__g_failure_reason; + +STBIDEF const char *stbi_failure_reason(void) +{ + return stbi__g_failure_reason; +} + +static int stbi__err(const char *str) +{ + stbi__g_failure_reason = str; + return 0; +} + +static void *stbi__malloc(size_t size) +{ + return STBI_MALLOC(size); +} + +// stb_image uses ints pervasively, including for offset calculations. +// therefore the largest decoded image size we can support with the +// current code, even on 64-bit targets, is INT_MAX. this is not a +// significant limitation for the intended use case. +// +// we do, however, need to make sure our size calculations don't +// overflow. hence a few helper functions for size calculations that +// multiply integers together, making sure that they're non-negative +// and no overflow occurs. + +// return 1 if the sum is valid, 0 on overflow. +// negative terms are considered invalid. +static int stbi__addsizes_valid(int a, int b) +{ + if (b < 0) return 0; + // now 0 <= b <= INT_MAX, hence also + // 0 <= INT_MAX - b <= INTMAX. + // And "a + b <= INT_MAX" (which might overflow) is the + // same as a <= INT_MAX - b (no overflow) + return a <= INT_MAX - b; +} + +// returns 1 if the product is valid, 0 on overflow. +// negative factors are considered invalid. +static int stbi__mul2sizes_valid(int a, int b) +{ + if (a < 0 || b < 0) return 0; + if (b == 0) return 1; // mul-by-0 is always safe + // portable way to check for no overflows in a*b + return a <= INT_MAX/b; +} + +// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow +static int stbi__mad2sizes_valid(int a, int b, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add); +} + +// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow +static int stbi__mad3sizes_valid(int a, int b, int c, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__addsizes_valid(a*b*c, add); +} + +// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow +static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add); +} + +// mallocs with size overflow checking +static void *stbi__malloc_mad2(int a, int b, int add) +{ + if (!stbi__mad2sizes_valid(a, b, add)) return NULL; + return stbi__malloc(a*b + add); +} + +static void *stbi__malloc_mad3(int a, int b, int c, int add) +{ + if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL; + return stbi__malloc(a*b*c + add); +} + +static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) +{ + if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; + return stbi__malloc(a*b*c*d + add); +} + +// stbi__err - error +// stbi__errpf - error returning pointer to float +// stbi__errpuc - error returning pointer to unsigned char + +#ifdef STBI_NO_FAILURE_STRINGS + #define stbi__err(x,y) 0 +#elif defined(STBI_FAILURE_USERMSG) + #define stbi__err(x,y) stbi__err(y) +#else + #define stbi__err(x,y) stbi__err(x) +#endif + +#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL)) +#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL)) + +STBIDEF void stbi_image_free(void *retval_from_stbi_load) +{ + STBI_FREE(retval_from_stbi_load); +} + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp); #endif -// is it a psd? -extern int stbi_psd_test_memory (stbi_uc const *buffer, int len); +#ifndef STBI_NO_HDR +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); +#endif + +static int stbi__vertically_flip_on_load = 0; + +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) +{ + stbi__vertically_flip_on_load = flag_true_if_should_flip; +} + +static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields + ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed + ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order + ri->num_channels = 0; + + #ifndef STBI_NO_JPEG + if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PNG + if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_BMP + if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_GIF + if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PSD + if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc); + #endif + #ifndef STBI_NO_PIC + if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PNM + if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri); + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri); + return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + + #ifndef STBI_NO_TGA + // test tga last because it's a crappy test! + if (stbi__tga_test(s)) + return stbi__tga_load(s,x,y,comp,req_comp, ri); + #endif + + return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); +} + +static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi_uc *reduced; + + reduced = (stbi_uc *) stbi__malloc(img_len); + if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling + + STBI_FREE(orig); + return reduced; +} + +static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi__uint16 *enlarged; + + enlarged = (stbi__uint16 *) stbi__malloc(img_len*2); + if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff + + STBI_FREE(orig); + return enlarged; +} + +static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8); + + if (result == NULL) + return NULL; + + if (ri.bits_per_channel != 8) { + STBI_ASSERT(ri.bits_per_channel == 16); + result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 8; + } + + // @TODO: move stbi__convert_format to here + + if (stbi__vertically_flip_on_load) { + int w = *x, h = *y; + int channels = req_comp ? req_comp : *comp; + int row,col,z; + stbi_uc *image = (stbi_uc *) result; + + // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once + for (row = 0; row < (h>>1); row++) { + for (col = 0; col < w; col++) { + for (z = 0; z < channels; z++) { + stbi_uc temp = image[(row * w + col) * channels + z]; + image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; + image[((h - row - 1) * w + col) * channels + z] = temp; + } + } + } + } + + return (unsigned char *) result; +} + +static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16); + + if (result == NULL) + return NULL; + + if (ri.bits_per_channel != 16) { + STBI_ASSERT(ri.bits_per_channel == 8); + result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 16; + } + + // @TODO: move stbi__convert_format16 to here + // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision + + if (stbi__vertically_flip_on_load) { + int w = *x, h = *y; + int channels = req_comp ? req_comp : *comp; + int row,col,z; + stbi__uint16 *image = (stbi__uint16 *) result; + + // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once + for (row = 0; row < (h>>1); row++) { + for (col = 0; col < w; col++) { + for (z = 0; z < channels; z++) { + stbi__uint16 temp = image[(row * w + col) * channels + z]; + image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; + image[((h - row - 1) * w + col) * channels + z] = temp; + } + } + } + } + + return (stbi__uint16 *) result; +} + +#ifndef STBI_NO_HDR +static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) +{ + if (stbi__vertically_flip_on_load && result != NULL) { + int w = *x, h = *y; + int depth = req_comp ? req_comp : *comp; + int row,col,z; + float temp; + + // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once + for (row = 0; row < (h>>1); row++) { + for (col = 0; col < w; col++) { + for (z = 0; z < depth; z++) { + temp = result[(row * w + col) * depth + z]; + result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z]; + result[((h - row - 1) * w + col) * depth + z] = temp; + } + } + } + } +} +#endif -extern stbi_uc *stbi_psd_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); #ifndef STBI_NO_STDIO -extern int stbi_psd_test_file (FILE *f); -extern stbi_uc *stbi_psd_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); + +static FILE *stbi__fopen(char const *filename, char const *mode) +{ + FILE *f; +#if defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != fopen_s(&f, filename, mode)) + f=0; +#else + f = fopen(filename, mode); #endif + return f; +} + -// is it an hdr? -extern int stbi_hdr_test_memory (stbi_uc const *buffer, int len); +STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + unsigned char *result; + if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__uint16 *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + stbi__uint16 *result; + if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file_16(f,x,y,comp,req_comp); + fclose(f); + return result; +} + + +#endif //!STBI_NO_STDIO + +STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_LINEAR +static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + stbi__result_info ri; + float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri); + if (hdr_data) + stbi__float_postprocess(hdr_data,x,y,comp,req_comp); + return hdr_data; + } + #endif + data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); + if (data) + return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); + return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); +} + +STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} -extern float * stbi_hdr_load (char const *filename, int *x, int *y, int *comp, int req_comp); -extern float * stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); #ifndef STBI_NO_STDIO -extern int stbi_hdr_test_file (FILE *f); -extern float * stbi_hdr_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + float *result; + FILE *f = stbi__fopen(filename, "rb"); + if (!f) return stbi__errpf("can't fopen", "Unable to open file"); + result = stbi_loadf_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_file(&s,f); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_LINEAR + +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always +// reports false! + +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(buffer); + STBI_NOTUSED(len); + return 0; + #endif +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result=0; + if (f) { + result = stbi_is_hdr_from_file(f); + fclose(f); + } + return result; +} + +STBIDEF int stbi_is_hdr_from_file(FILE *f) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_file(&s,f); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(f); + return 0; + #endif +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(clbk); + STBI_NOTUSED(user); + return 0; + #endif +} + +#ifndef STBI_NO_LINEAR +static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; + +STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } +STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } +#endif + +static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; + +STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } +STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } + + +////////////////////////////////////////////////////////////////////////////// +// +// Common code used by all image loaders +// + +enum +{ + STBI__SCAN_load=0, + STBI__SCAN_type, + STBI__SCAN_header +}; + +static void stbi__refill_buffer(stbi__context *s) +{ + int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); + if (n == 0) { + // at end of file, treat same as if from memory, but need to handle case + // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file + s->read_from_callbacks = 0; + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start+1; + *s->img_buffer = 0; + } else { + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start + n; + } +} + +stbi_inline static stbi_uc stbi__get8(stbi__context *s) +{ + if (s->img_buffer < s->img_buffer_end) + return *s->img_buffer++; + if (s->read_from_callbacks) { + stbi__refill_buffer(s); + return *s->img_buffer++; + } + return 0; +} + +stbi_inline static int stbi__at_eof(stbi__context *s) +{ + if (s->io.read) { + if (!(s->io.eof)(s->io_user_data)) return 0; + // if feof() is true, check if buffer = end + // special case: we've only got the special 0 character at the end + if (s->read_from_callbacks == 0) return 1; + } + + return s->img_buffer >= s->img_buffer_end; +} + +static void stbi__skip(stbi__context *s, int n) +{ + if (n < 0) { + s->img_buffer = s->img_buffer_end; + return; + } + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + s->img_buffer = s->img_buffer_end; + (s->io.skip)(s->io_user_data, n - blen); + return; + } + } + s->img_buffer += n; +} + +static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) +{ + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + int res, count; + + memcpy(buffer, s->img_buffer, blen); + + count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); + res = (count == (n-blen)); + s->img_buffer = s->img_buffer_end; + return res; + } + } + + if (s->img_buffer+n <= s->img_buffer_end) { + memcpy(buffer, s->img_buffer, n); + s->img_buffer += n; + return 1; + } else + return 0; +} + +static int stbi__get16be(stbi__context *s) +{ + int z = stbi__get8(s); + return (z << 8) + stbi__get8(s); +} + +static stbi__uint32 stbi__get32be(stbi__context *s) +{ + stbi__uint32 z = stbi__get16be(s); + return (z << 16) + stbi__get16be(s); +} + +#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) +// nothing +#else +static int stbi__get16le(stbi__context *s) +{ + int z = stbi__get8(s); + return z + (stbi__get8(s) << 8); +} #endif -// define new loaders +#ifndef STBI_NO_BMP +static stbi__uint32 stbi__get32le(stbi__context *s) +{ + stbi__uint32 z = stbi__get16le(s); + return z + (stbi__get16le(s) << 16); +} +#endif + +#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings + + +////////////////////////////////////////////////////////////////////////////// +// +// generic converter from built-in img_n to req_comp +// individual types do this automatically as much as possible (e.g. jpeg +// does all cases internally since it needs to colorspace convert anyway, +// and it never has alpha, so very few cases ). png can automatically +// interleave an alpha=255 channel, but falls back to this for other cases +// +// assume data buffer is malloced, so malloc a new one and free that one +// only failure mode is malloc failing + +static stbi_uc stbi__compute_y(int r, int g, int b) +{ + return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); +} + +static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + unsigned char *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0); + if (good == NULL) { + STBI_FREE(data); + return stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + unsigned char *src = data + j * x * img_n ; + unsigned char *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0], dest[1]=255; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break; + default: STBI_ASSERT(0); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} + +static stbi__uint16 stbi__compute_y_16(int r, int g, int b) +{ + return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8); +} + +static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + stbi__uint16 *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2); + if (good == NULL) { + STBI_FREE(data); + return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + stbi__uint16 *src = data + j * x * img_n ; + stbi__uint16 *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0], dest[1]=0xffff; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=0xffff; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=0xffff; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = 0xffff; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break; + default: STBI_ASSERT(0); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) +{ + int i,k,n; + float *output; + if (!data) return NULL; + output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); + } + if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; + } + STBI_FREE(data); + return output; +} +#endif + +#ifndef STBI_NO_HDR +#define stbi__float2int(x) ((int) (x)) +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) +{ + int i,k,n; + stbi_uc *output; + if (!data) return NULL; + output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + if (k < comp) { + float z = data[i*comp+k] * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + } + STBI_FREE(data); + return output; +} +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// "baseline" JPEG/JFIF decoder +// +// simple implementation +// - doesn't support delayed output of y-dimension +// - simple interface (only one output format: 8-bit interleaved RGB) +// - doesn't try to recover corrupt jpegs +// - doesn't allow partial loading, loading multiple at once +// - still fast on x86 (copying globals into locals doesn't help x86) +// - allocates lots of intermediate memory (full size of all components) +// - non-interleaved case requires this anyway +// - allows good upsampling (see next) +// high-quality +// - upsampled channels are bilinearly interpolated, even across blocks +// - quality integer IDCT derived from IJG's 'slow' +// performance +// - fast huffman; reasonable integer IDCT +// - some SIMD kernels for common paths on targets with SSE2/NEON +// - uses a lot of intermediate memory, could cache poorly + +#ifndef STBI_NO_JPEG + +// huffman decoding acceleration +#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache + typedef struct { - int (*test_memory)(stbi_uc const *buffer, int len); - stbi_uc * (*load_from_memory)(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); -#ifndef STBI_NO_STDIO - int (*test_file)(FILE *f); - stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp); + stbi_uc fast[1 << FAST_BITS]; + // weirdly, repacking this into AoS is a 10% speed loss, instead of a win + stbi__uint16 code[256]; + stbi_uc values[256]; + stbi_uc size[257]; + unsigned int maxcode[18]; + int delta[17]; // old 'firstsymbol' - old 'firstcode' +} stbi__huffman; + +typedef struct +{ + stbi__context *s; + stbi__huffman huff_dc[4]; + stbi__huffman huff_ac[4]; + stbi_uc dequant[4][64]; + stbi__int16 fast_ac[4][1 << FAST_BITS]; + +// sizes for components, interleaved MCUs + int img_h_max, img_v_max; + int img_mcu_x, img_mcu_y; + int img_mcu_w, img_mcu_h; + +// definition of jpeg image component + struct + { + int id; + int h,v; + int tq; + int hd,ha; + int dc_pred; + + int x,y,w2,h2; + stbi_uc *data; + void *raw_data, *raw_coeff; + stbi_uc *linebuf; + short *coeff; // progressive only + int coeff_w, coeff_h; // number of 8x8 coefficient blocks + } img_comp[4]; + + stbi__uint32 code_buffer; // jpeg entropy-coded buffer + int code_bits; // number of valid bits + unsigned char marker; // marker seen while filling entropy buffer + int nomore; // flag if we saw a marker so must stop + + int progressive; + int spec_start; + int spec_end; + int succ_high; + int succ_low; + int eob_run; + int rgb; + + int scan_n, order[4]; + int restart_interval, todo; + +// kernels + void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]); + void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step); + stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs); +} stbi__jpeg; + +static int stbi__build_huffman(stbi__huffman *h, int *count) +{ + int i,j,k=0,code; + // build size list for each symbol (from JPEG spec) + for (i=0; i < 16; ++i) + for (j=0; j < count[i]; ++j) + h->size[k++] = (stbi_uc) (i+1); + h->size[k] = 0; + + // compute actual symbols (from jpeg spec) + code = 0; + k = 0; + for(j=1; j <= 16; ++j) { + // compute delta to add to code to compute symbol id + h->delta[j] = k - code; + if (h->size[k] == j) { + while (h->size[k] == j) + h->code[k++] = (stbi__uint16) (code++); + if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG"); + } + // compute largest code + 1 for this size, preshifted as needed later + h->maxcode[j] = code << (16-j); + code <<= 1; + } + h->maxcode[j] = 0xffffffff; + + // build non-spec acceleration table; 255 is flag for not-accelerated + memset(h->fast, 255, 1 << FAST_BITS); + for (i=0; i < k; ++i) { + int s = h->size[i]; + if (s <= FAST_BITS) { + int c = h->code[i] << (FAST_BITS-s); + int m = 1 << (FAST_BITS-s); + for (j=0; j < m; ++j) { + h->fast[c+j] = (stbi_uc) i; + } + } + } + return 1; +} + +// build a table that decodes both magnitude and value of small ACs in +// one go. +static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) +{ + int i; + for (i=0; i < (1 << FAST_BITS); ++i) { + stbi_uc fast = h->fast[i]; + fast_ac[i] = 0; + if (fast < 255) { + int rs = h->values[fast]; + int run = (rs >> 4) & 15; + int magbits = rs & 15; + int len = h->size[fast]; + + if (magbits && len + magbits <= FAST_BITS) { + // magnitude code followed by receive_extend code + int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); + int m = 1 << (magbits - 1); + if (k < m) k += (-1 << magbits) + 1; + // if the result is small enough, we can fit it in fast_ac table + if (k >= -128 && k <= 127) + fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits)); + } + } + } +} + +static void stbi__grow_buffer_unsafe(stbi__jpeg *j) +{ + do { + int b = j->nomore ? 0 : stbi__get8(j->s); + if (b == 0xff) { + int c = stbi__get8(j->s); + if (c != 0) { + j->marker = (unsigned char) c; + j->nomore = 1; + return; + } + } + j->code_buffer |= b << (24 - j->code_bits); + j->code_bits += 8; + } while (j->code_bits <= 24); +} + +// (1 << n) - 1 +static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; + +// decode a jpeg huffman value from the bitstream +stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) +{ + unsigned int temp; + int c,k; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + // look at the top FAST_BITS and determine what symbol ID it is, + // if the code is <= FAST_BITS + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + k = h->fast[c]; + if (k < 255) { + int s = h->size[k]; + if (s > j->code_bits) + return -1; + j->code_buffer <<= s; + j->code_bits -= s; + return h->values[k]; + } + + // naive test is to shift the code_buffer down so k bits are + // valid, then test against maxcode. To speed this up, we've + // preshifted maxcode left so that it has (16-k) 0s at the + // end; in other words, regardless of the number of bits, it + // wants to be compared against something shifted to have 16; + // that way we don't need to shift inside the loop. + temp = j->code_buffer >> 16; + for (k=FAST_BITS+1 ; ; ++k) + if (temp < h->maxcode[k]) + break; + if (k == 17) { + // error! code not found + j->code_bits -= 16; + return -1; + } + + if (k > j->code_bits) + return -1; + + // convert the huffman code to the symbol id + c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; + STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); + + // convert the id to a symbol + j->code_bits -= k; + j->code_buffer <<= k; + return h->values[c]; +} + +// bias[n] = (-1<<n) + 1 +static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767}; + +// combined JPEG 'receive' and JPEG 'extend', since baseline +// always extends everything it receives. +stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n) +{ + unsigned int k; + int sgn; + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); + + sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB + k = stbi_lrot(j->code_buffer, n); + STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask))); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k + (stbi__jbias[n] & ~sgn); +} + +// get some unsigned bits +stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) +{ + unsigned int k; + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k; +} + +stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) +{ + unsigned int k; + if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); + k = j->code_buffer; + j->code_buffer <<= 1; + --j->code_bits; + return k & 0x80000000; +} + +// given a value that's at position X in the zigzag stream, +// where does it appear in the 8x8 matrix coded as row-major? +static stbi_uc stbi__jpeg_dezigzag[64+15] = +{ + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63, + // let corrupt input sample past end + 63, 63, 63, 63, 63, 63, 63, 63, + 63, 63, 63, 63, 63, 63, 63 +}; + +// decode one 64-entry block-- +static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant) +{ + int diff,dc,k; + int t; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + t = stbi__jpeg_huff_decode(j, hdc); + if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + + // 0 all the ac values now so we can do it 32-bits at a time + memset(data,0,64*sizeof(data[0])); + + diff = t ? stbi__extend_receive(j, t) : 0; + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + data[0] = (short) (dc * dequant[0]); + + // decode AC components, see JPEG spec + k = 1; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + j->code_buffer <<= s; + j->code_bits -= s; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) * dequant[zig]); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (rs != 0xf0) break; // end block + k += 16; + } else { + k += r; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); + } + } + } while (k < 64); + return 1; +} + +static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) +{ + int diff,dc; + int t; + if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + if (j->succ_high == 0) { + // first scan for DC coefficient, must be first + memset(data,0,64*sizeof(data[0])); // 0 all the ac values now + t = stbi__jpeg_huff_decode(j, hdc); + diff = t ? stbi__extend_receive(j, t) : 0; + + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + data[0] = (short) (dc << j->succ_low); + } else { + // refinement scan for DC coefficient + if (stbi__jpeg_get_bit(j)) + data[0] += (short) (1 << j->succ_low); + } + return 1; +} + +// @OPTIMIZE: store non-zigzagged during the decode passes, +// and only de-zigzag when dequantizing +static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) +{ + int k; + if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->succ_high == 0) { + int shift = j->succ_low; + + if (j->eob_run) { + --j->eob_run; + return 1; + } + + k = j->spec_start; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + j->code_buffer <<= s; + j->code_bits -= s; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) << shift); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r); + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + --j->eob_run; + break; + } + k += 16; + } else { + k += r; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) << shift); + } + } + } while (k <= j->spec_end); + } else { + // refinement scan for these AC coefficients + + short bit = (short) (1 << j->succ_low); + + if (j->eob_run) { + --j->eob_run; + for (k = j->spec_start; k <= j->spec_end; ++k) { + short *p = &data[stbi__jpeg_dezigzag[k]]; + if (*p != 0) + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } + } else { + k = j->spec_start; + do { + int r,s; + int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r) - 1; + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + r = 64; // force end of block + } else { + // r=15 s=0 should write 16 0s, so we just do + // a run of 15 0s and then write s (which is 0), + // so we don't have to do anything special here + } + } else { + if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); + // sign bit + if (stbi__jpeg_get_bit(j)) + s = bit; + else + s = -bit; + } + + // advance by r + while (k <= j->spec_end) { + short *p = &data[stbi__jpeg_dezigzag[k++]]; + if (*p != 0) { + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } else { + if (r == 0) { + *p = (short) s; + break; + } + --r; + } + } + } while (k <= j->spec_end); + } + } + return 1; +} + +// take a -128..127 value and stbi__clamp it and convert to 0..255 +stbi_inline static stbi_uc stbi__clamp(int x) +{ + // trick to use a single test to catch both cases + if ((unsigned int) x > 255) { + if (x < 0) return 0; + if (x > 255) return 255; + } + return (stbi_uc) x; +} + +#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) +#define stbi__fsh(x) ((x) << 12) + +// derived from jidctint -- DCT_ISLOW +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ + int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ + p2 = s2; \ + p3 = s6; \ + p1 = (p2+p3) * stbi__f2f(0.5411961f); \ + t2 = p1 + p3*stbi__f2f(-1.847759065f); \ + t3 = p1 + p2*stbi__f2f( 0.765366865f); \ + p2 = s0; \ + p3 = s4; \ + t0 = stbi__fsh(p2+p3); \ + t1 = stbi__fsh(p2-p3); \ + x0 = t0+t3; \ + x3 = t0-t3; \ + x1 = t1+t2; \ + x2 = t1-t2; \ + t0 = s7; \ + t1 = s5; \ + t2 = s3; \ + t3 = s1; \ + p3 = t0+t2; \ + p4 = t1+t3; \ + p1 = t0+t3; \ + p2 = t1+t2; \ + p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ + t0 = t0*stbi__f2f( 0.298631336f); \ + t1 = t1*stbi__f2f( 2.053119869f); \ + t2 = t2*stbi__f2f( 3.072711026f); \ + t3 = t3*stbi__f2f( 1.501321110f); \ + p1 = p5 + p1*stbi__f2f(-0.899976223f); \ + p2 = p5 + p2*stbi__f2f(-2.562915447f); \ + p3 = p3*stbi__f2f(-1.961570560f); \ + p4 = p4*stbi__f2f(-0.390180644f); \ + t3 += p1+p4; \ + t2 += p2+p3; \ + t1 += p2+p4; \ + t0 += p1+p3; + +static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) +{ + int i,val[64],*v=val; + stbi_uc *o; + short *d = data; + + // columns + for (i=0; i < 8; ++i,++d, ++v) { + // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing + if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 + && d[40]==0 && d[48]==0 && d[56]==0) { + // no shortcut 0 seconds + // (1|2|3|4|5|6|7)==0 0 seconds + // all separate -0.047 seconds + // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds + int dcterm = d[0] << 2; + v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; + } else { + STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) + // constants scaled things up by 1<<12; let's bring them back + // down, but keep 2 extra bits of precision + x0 += 512; x1 += 512; x2 += 512; x3 += 512; + v[ 0] = (x0+t3) >> 10; + v[56] = (x0-t3) >> 10; + v[ 8] = (x1+t2) >> 10; + v[48] = (x1-t2) >> 10; + v[16] = (x2+t1) >> 10; + v[40] = (x2-t1) >> 10; + v[24] = (x3+t0) >> 10; + v[32] = (x3-t0) >> 10; + } + } + + for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { + // no fast case since the first 1D IDCT spread components out + STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) + // constants scaled things up by 1<<12, plus we had 1<<2 from first + // loop, plus horizontal and vertical each scale by sqrt(8) so together + // we've got an extra 1<<3, so 1<<17 total we need to remove. + // so we want to round that, which means adding 0.5 * 1<<17, + // aka 65536. Also, we'll end up with -128 to 127 that we want + // to encode as 0..255 by adding 128, so we'll add that before the shift + x0 += 65536 + (128<<17); + x1 += 65536 + (128<<17); + x2 += 65536 + (128<<17); + x3 += 65536 + (128<<17); + // tried computing the shifts into temps, or'ing the temps to see + // if any were out of range, but that was slower + o[0] = stbi__clamp((x0+t3) >> 17); + o[7] = stbi__clamp((x0-t3) >> 17); + o[1] = stbi__clamp((x1+t2) >> 17); + o[6] = stbi__clamp((x1-t2) >> 17); + o[2] = stbi__clamp((x2+t1) >> 17); + o[5] = stbi__clamp((x2-t1) >> 17); + o[3] = stbi__clamp((x3+t0) >> 17); + o[4] = stbi__clamp((x3-t0) >> 17); + } +} + +#ifdef STBI_SSE2 +// sse2 integer IDCT. not the fastest possible implementation but it +// produces bit-identical results to the generic C version so it's +// fully "transparent". +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + // This is constructed to match our regular (generic) integer IDCT exactly. + __m128i row0, row1, row2, row3, row4, row5, row6, row7; + __m128i tmp; + + // dot product constant: even elems=x, odd elems=y + #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) + + // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) + // out(1) = c1[even]*x + c1[odd]*y + #define dct_rot(out0,out1, x,y,c0,c1) \ + __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ + __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ + __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ + __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ + __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ + __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) + + // out = in << 12 (in 16-bit, out 32-bit) + #define dct_widen(out, in) \ + __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ + __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) + + // wide add + #define dct_wadd(out, a, b) \ + __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_add_epi32(a##_h, b##_h) + + // wide sub + #define dct_wsub(out, a, b) \ + __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) + + // butterfly a/b, add bias, then shift by "s" and pack + #define dct_bfly32o(out0, out1, a,b,bias,s) \ + { \ + __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ + __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ + dct_wadd(sum, abiased, b); \ + dct_wsub(dif, abiased, b); \ + out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ + out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ + } + + // 8-bit interleave step (for transposes) + #define dct_interleave8(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi8(a, b); \ + b = _mm_unpackhi_epi8(tmp, b) + + // 16-bit interleave step (for transposes) + #define dct_interleave16(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi16(a, b); \ + b = _mm_unpackhi_epi16(tmp, b) + + #define dct_pass(bias,shift) \ + { \ + /* even part */ \ + dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ + __m128i sum04 = _mm_add_epi16(row0, row4); \ + __m128i dif04 = _mm_sub_epi16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ + dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ + __m128i sum17 = _mm_add_epi16(row1, row7); \ + __m128i sum35 = _mm_add_epi16(row3, row5); \ + dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ + dct_wadd(x4, y0o, y4o); \ + dct_wadd(x5, y1o, y5o); \ + dct_wadd(x6, y2o, y5o); \ + dct_wadd(x7, y3o, y4o); \ + dct_bfly32o(row0,row7, x0,x7,bias,shift); \ + dct_bfly32o(row1,row6, x1,x6,bias,shift); \ + dct_bfly32o(row2,row5, x2,x5,bias,shift); \ + dct_bfly32o(row3,row4, x3,x4,bias,shift); \ + } + + __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); + __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); + __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); + __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); + __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); + __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); + __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); + __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); + + // rounding biases in column/row passes, see stbi__idct_block for explanation. + __m128i bias_0 = _mm_set1_epi32(512); + __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); + + // load + row0 = _mm_load_si128((const __m128i *) (data + 0*8)); + row1 = _mm_load_si128((const __m128i *) (data + 1*8)); + row2 = _mm_load_si128((const __m128i *) (data + 2*8)); + row3 = _mm_load_si128((const __m128i *) (data + 3*8)); + row4 = _mm_load_si128((const __m128i *) (data + 4*8)); + row5 = _mm_load_si128((const __m128i *) (data + 5*8)); + row6 = _mm_load_si128((const __m128i *) (data + 6*8)); + row7 = _mm_load_si128((const __m128i *) (data + 7*8)); + + // column pass + dct_pass(bias_0, 10); + + { + // 16bit 8x8 transpose pass 1 + dct_interleave16(row0, row4); + dct_interleave16(row1, row5); + dct_interleave16(row2, row6); + dct_interleave16(row3, row7); + + // transpose pass 2 + dct_interleave16(row0, row2); + dct_interleave16(row1, row3); + dct_interleave16(row4, row6); + dct_interleave16(row5, row7); + + // transpose pass 3 + dct_interleave16(row0, row1); + dct_interleave16(row2, row3); + dct_interleave16(row4, row5); + dct_interleave16(row6, row7); + } + + // row pass + dct_pass(bias_1, 17); + + { + // pack + __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 + __m128i p1 = _mm_packus_epi16(row2, row3); + __m128i p2 = _mm_packus_epi16(row4, row5); + __m128i p3 = _mm_packus_epi16(row6, row7); + + // 8bit 8x8 transpose pass 1 + dct_interleave8(p0, p2); // a0e0a1e1... + dct_interleave8(p1, p3); // c0g0c1g1... + + // transpose pass 2 + dct_interleave8(p0, p1); // a0c0e0g0... + dct_interleave8(p2, p3); // b0d0f0h0... + + // transpose pass 3 + dct_interleave8(p0, p2); // a0b0c0d0... + dct_interleave8(p1, p3); // a4b4c4d4... + + // store + _mm_storel_epi64((__m128i *) out, p0); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p2); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p1); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p3); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); + } + +#undef dct_const +#undef dct_rot +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_interleave8 +#undef dct_interleave16 +#undef dct_pass +} + +#endif // STBI_SSE2 + +#ifdef STBI_NEON + +// NEON integer IDCT. should produce bit-identical +// results to the generic C version. +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; + + int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); + int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); + int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); + int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); + int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); + int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); + int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); + int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); + int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); + int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); + int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); + int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); + +#define dct_long_mul(out, inq, coeff) \ + int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) + +#define dct_long_mac(out, acc, inq, coeff) \ + int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) + +#define dct_widen(out, inq) \ + int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ + int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) + +// wide add +#define dct_wadd(out, a, b) \ + int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vaddq_s32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ + int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vsubq_s32(a##_h, b##_h) + +// butterfly a/b, then shift using "shiftop" by "s" and pack +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ + { \ + dct_wadd(sum, a, b); \ + dct_wsub(dif, a, b); \ + out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ + out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ + } + +#define dct_pass(shiftop, shift) \ + { \ + /* even part */ \ + int16x8_t sum26 = vaddq_s16(row2, row6); \ + dct_long_mul(p1e, sum26, rot0_0); \ + dct_long_mac(t2e, p1e, row6, rot0_1); \ + dct_long_mac(t3e, p1e, row2, rot0_2); \ + int16x8_t sum04 = vaddq_s16(row0, row4); \ + int16x8_t dif04 = vsubq_s16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + int16x8_t sum15 = vaddq_s16(row1, row5); \ + int16x8_t sum17 = vaddq_s16(row1, row7); \ + int16x8_t sum35 = vaddq_s16(row3, row5); \ + int16x8_t sum37 = vaddq_s16(row3, row7); \ + int16x8_t sumodd = vaddq_s16(sum17, sum35); \ + dct_long_mul(p5o, sumodd, rot1_0); \ + dct_long_mac(p1o, p5o, sum17, rot1_1); \ + dct_long_mac(p2o, p5o, sum35, rot1_2); \ + dct_long_mul(p3o, sum37, rot2_0); \ + dct_long_mul(p4o, sum15, rot2_1); \ + dct_wadd(sump13o, p1o, p3o); \ + dct_wadd(sump24o, p2o, p4o); \ + dct_wadd(sump23o, p2o, p3o); \ + dct_wadd(sump14o, p1o, p4o); \ + dct_long_mac(x4, sump13o, row7, rot3_0); \ + dct_long_mac(x5, sump24o, row5, rot3_1); \ + dct_long_mac(x6, sump23o, row3, rot3_2); \ + dct_long_mac(x7, sump14o, row1, rot3_3); \ + dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ + dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ + dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ + dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ + } + + // load + row0 = vld1q_s16(data + 0*8); + row1 = vld1q_s16(data + 1*8); + row2 = vld1q_s16(data + 2*8); + row3 = vld1q_s16(data + 3*8); + row4 = vld1q_s16(data + 4*8); + row5 = vld1q_s16(data + 5*8); + row6 = vld1q_s16(data + 6*8); + row7 = vld1q_s16(data + 7*8); + + // add DC bias + row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); + + // column pass + dct_pass(vrshrn_n_s32, 10); + + // 16bit 8x8 transpose + { +// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. +// whether compilers actually get this is another story, sadly. +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } + + // pass 1 + dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 + dct_trn16(row2, row3); + dct_trn16(row4, row5); + dct_trn16(row6, row7); + + // pass 2 + dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 + dct_trn32(row1, row3); + dct_trn32(row4, row6); + dct_trn32(row5, row7); + + // pass 3 + dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 + dct_trn64(row1, row5); + dct_trn64(row2, row6); + dct_trn64(row3, row7); + +#undef dct_trn16 +#undef dct_trn32 +#undef dct_trn64 + } + + // row pass + // vrshrn_n_s32 only supports shifts up to 16, we need + // 17. so do a non-rounding shift of 16 first then follow + // up with a rounding shift by 1. + dct_pass(vshrn_n_s32, 16); + + { + // pack and round + uint8x8_t p0 = vqrshrun_n_s16(row0, 1); + uint8x8_t p1 = vqrshrun_n_s16(row1, 1); + uint8x8_t p2 = vqrshrun_n_s16(row2, 1); + uint8x8_t p3 = vqrshrun_n_s16(row3, 1); + uint8x8_t p4 = vqrshrun_n_s16(row4, 1); + uint8x8_t p5 = vqrshrun_n_s16(row5, 1); + uint8x8_t p6 = vqrshrun_n_s16(row6, 1); + uint8x8_t p7 = vqrshrun_n_s16(row7, 1); + + // again, these can translate into one instruction, but often don't. +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } + + // sadly can't use interleaved stores here since we only write + // 8 bytes to each scan line! + + // 8x8 8-bit transpose pass 1 + dct_trn8_8(p0, p1); + dct_trn8_8(p2, p3); + dct_trn8_8(p4, p5); + dct_trn8_8(p6, p7); + + // pass 2 + dct_trn8_16(p0, p2); + dct_trn8_16(p1, p3); + dct_trn8_16(p4, p6); + dct_trn8_16(p5, p7); + + // pass 3 + dct_trn8_32(p0, p4); + dct_trn8_32(p1, p5); + dct_trn8_32(p2, p6); + dct_trn8_32(p3, p7); + + // store + vst1_u8(out, p0); out += out_stride; + vst1_u8(out, p1); out += out_stride; + vst1_u8(out, p2); out += out_stride; + vst1_u8(out, p3); out += out_stride; + vst1_u8(out, p4); out += out_stride; + vst1_u8(out, p5); out += out_stride; + vst1_u8(out, p6); out += out_stride; + vst1_u8(out, p7); + +#undef dct_trn8_8 +#undef dct_trn8_16 +#undef dct_trn8_32 + } + +#undef dct_long_mul +#undef dct_long_mac +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_pass +} + +#endif // STBI_NEON + +#define STBI__MARKER_none 0xff +// if there's a pending marker from the entropy stream, return that +// otherwise, fetch from the stream and get a marker. if there's no +// marker, return 0xff, which is never a valid marker value +static stbi_uc stbi__get_marker(stbi__jpeg *j) +{ + stbi_uc x; + if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } + x = stbi__get8(j->s); + if (x != 0xff) return STBI__MARKER_none; + while (x == 0xff) + x = stbi__get8(j->s); + return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, stbi__jpeg_reset the entropy decoder and +// the dc prediction +static void stbi__jpeg_reset(stbi__jpeg *j) +{ + j->code_bits = 0; + j->code_buffer = 0; + j->nomore = 0; + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; + j->marker = STBI__MARKER_none; + j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; + j->eob_run = 0; + // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, + // since we don't even allow 1<<30 pixels +} + +static int stbi__parse_entropy_coded_data(stbi__jpeg *z) +{ + stbi__jpeg_reset(z); + if (!z->progressive) { + if (z->scan_n == 1) { + int i,j; + STBI_SIMD_ALIGN(short, data[64]); + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + STBI_SIMD_ALIGN(short, data[64]); + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x)*8; + int y2 = (j*z->img_comp[n].v + y)*8; + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } else { + if (z->scan_n == 1) { + int i,j; + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + if (z->spec_start == 0) { + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } else { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) + return 0; + } + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x); + int y2 = (j*z->img_comp[n].v + y); + short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } +} + +static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant) +{ + int i; + for (i=0; i < 64; ++i) + data[i] *= dequant[i]; +} + +static void stbi__jpeg_finish(stbi__jpeg *z) +{ + if (z->progressive) { + // dequantize and idct the data + int i,j,n; + for (n=0; n < z->s->img_n; ++n) { + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + } + } + } + } +} + +static int stbi__process_marker(stbi__jpeg *z, int m) +{ + int L; + switch (m) { + case STBI__MARKER_none: // no marker found + return stbi__err("expected marker","Corrupt JPEG"); + + case 0xDD: // DRI - specify restart interval + if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); + z->restart_interval = stbi__get16be(z->s); + return 1; + + case 0xDB: // DQT - define quantization table + L = stbi__get16be(z->s)-2; + while (L > 0) { + int q = stbi__get8(z->s); + int p = q >> 4; + int t = q & 15,i; + if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG"); + if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); + for (i=0; i < 64; ++i) + z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s); + L -= 65; + } + return L==0; + + case 0xC4: // DHT - define huffman table + L = stbi__get16be(z->s)-2; + while (L > 0) { + stbi_uc *v; + int sizes[16],i,n=0; + int q = stbi__get8(z->s); + int tc = q >> 4; + int th = q & 15; + if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); + for (i=0; i < 16; ++i) { + sizes[i] = stbi__get8(z->s); + n += sizes[i]; + } + L -= 17; + if (tc == 0) { + if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; + v = z->huff_dc[th].values; + } else { + if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; + v = z->huff_ac[th].values; + } + for (i=0; i < n; ++i) + v[i] = stbi__get8(z->s); + if (tc != 0) + stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); + L -= n; + } + return L==0; + } + // check for comment block or APP blocks + if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { + stbi__skip(z->s, stbi__get16be(z->s)-2); + return 1; + } + return 0; +} + +// after we see SOS +static int stbi__process_scan_header(stbi__jpeg *z) +{ + int i; + int Ls = stbi__get16be(z->s); + z->scan_n = stbi__get8(z->s); + if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); + if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); + for (i=0; i < z->scan_n; ++i) { + int id = stbi__get8(z->s), which; + int q = stbi__get8(z->s); + for (which = 0; which < z->s->img_n; ++which) + if (z->img_comp[which].id == id) + break; + if (which == z->s->img_n) return 0; // no match + z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); + z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); + z->order[i] = which; + } + + { + int aa; + z->spec_start = stbi__get8(z->s); + z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 + aa = stbi__get8(z->s); + z->succ_high = (aa >> 4); + z->succ_low = (aa & 15); + if (z->progressive) { + if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) + return stbi__err("bad SOS", "Corrupt JPEG"); + } else { + if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); + if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); + z->spec_end = 63; + } + } + + return 1; +} + +static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) +{ + int i; + for (i=0; i < ncomp; ++i) { + if (z->img_comp[i].raw_data) { + STBI_FREE(z->img_comp[i].raw_data); + z->img_comp[i].raw_data = NULL; + z->img_comp[i].data = NULL; + } + if (z->img_comp[i].raw_coeff) { + STBI_FREE(z->img_comp[i].raw_coeff); + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].coeff = 0; + } + if (z->img_comp[i].linebuf) { + STBI_FREE(z->img_comp[i].linebuf); + z->img_comp[i].linebuf = NULL; + } + } + return why; +} + +static int stbi__process_frame_header(stbi__jpeg *z, int scan) +{ + stbi__context *s = z->s; + int Lf,p,i,q, h_max=1,v_max=1,c; + Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG + p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline + s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG + s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires + c = stbi__get8(s); + if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG"); // JFIF requires + s->img_n = c; + for (i=0; i < c; ++i) { + z->img_comp[i].data = NULL; + z->img_comp[i].linebuf = NULL; + } + + if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); + + z->rgb = 0; + for (i=0; i < s->img_n; ++i) { + static unsigned char rgb[3] = { 'R', 'G', 'B' }; + z->img_comp[i].id = stbi__get8(s); + if (z->img_comp[i].id != i+1) // JFIF requires + if (z->img_comp[i].id != i) { // some version of jpegtran outputs non-JFIF-compliant files! + // somethings output this (see http://fileformats.archiveteam.org/wiki/JPEG#Color_format) + if (z->img_comp[i].id != rgb[i]) + return stbi__err("bad component ID","Corrupt JPEG"); + ++z->rgb; + } + q = stbi__get8(s); + z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); + z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); + z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); + } + + if (scan != STBI__SCAN_load) return 1; + + if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode"); + + for (i=0; i < s->img_n; ++i) { + if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; + if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; + } + + // compute interleaved mcu info + z->img_h_max = h_max; + z->img_v_max = v_max; + z->img_mcu_w = h_max * 8; + z->img_mcu_h = v_max * 8; + // these sizes can't be more than 17 bits + z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; + z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; + + for (i=0; i < s->img_n; ++i) { + // number of effective pixels (e.g. for non-interleaved MCU) + z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; + z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; + // to simplify generation, we'll allocate enough memory to decode + // the bogus oversized data from using interleaved MCUs and their + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't + // discard the extra data until colorspace conversion + // + // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) + // so these muls can't overflow with 32-bit ints (which we require) + z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; + z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; + z->img_comp[i].coeff = 0; + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].linebuf = NULL; + z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); + if (z->img_comp[i].raw_data == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + // align blocks for idct using mmx/sse + z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); + if (z->progressive) { + // w2, h2 are multiples of 8 (see above) + z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; + z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; + z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); + if (z->img_comp[i].raw_coeff == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); + } + } + + return 1; +} + +// use comparisons since in some cases we handle more than one case (e.g. SOF) +#define stbi__DNL(x) ((x) == 0xdc) +#define stbi__SOI(x) ((x) == 0xd8) +#define stbi__EOI(x) ((x) == 0xd9) +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) +#define stbi__SOS(x) ((x) == 0xda) + +#define stbi__SOF_progressive(x) ((x) == 0xc2) + +static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) +{ + int m; + z->marker = STBI__MARKER_none; // initialize cached marker to empty + m = stbi__get_marker(z); + if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); + if (scan == STBI__SCAN_type) return 1; + m = stbi__get_marker(z); + while (!stbi__SOF(m)) { + if (!stbi__process_marker(z,m)) return 0; + m = stbi__get_marker(z); + while (m == STBI__MARKER_none) { + // some files have extra padding after their blocks, so ok, we'll scan + if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); + m = stbi__get_marker(z); + } + } + z->progressive = stbi__SOF_progressive(m); + if (!stbi__process_frame_header(z, scan)) return 0; + return 1; +} + +// decode image to YCbCr format +static int stbi__decode_jpeg_image(stbi__jpeg *j) +{ + int m; + for (m = 0; m < 4; m++) { + j->img_comp[m].raw_data = NULL; + j->img_comp[m].raw_coeff = NULL; + } + j->restart_interval = 0; + if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; + m = stbi__get_marker(j); + while (!stbi__EOI(m)) { + if (stbi__SOS(m)) { + if (!stbi__process_scan_header(j)) return 0; + if (!stbi__parse_entropy_coded_data(j)) return 0; + if (j->marker == STBI__MARKER_none ) { + // handle 0s at the end of image data from IP Kamera 9060 + while (!stbi__at_eof(j->s)) { + int x = stbi__get8(j->s); + if (x == 255) { + j->marker = stbi__get8(j->s); + break; + } else if (x != 0) { + return stbi__err("junk before marker", "Corrupt JPEG"); + } + } + // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 + } + } else { + if (!stbi__process_marker(j, m)) return 0; + } + m = stbi__get_marker(j); + } + if (j->progressive) + stbi__jpeg_finish(j); + return 1; +} + +// static jfif-centered resampling (across block boundaries) + +typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, + int w, int hs); + +#define stbi__div4(x) ((stbi_uc) ((x) >> 2)) + +static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + STBI_NOTUSED(out); + STBI_NOTUSED(in_far); + STBI_NOTUSED(w); + STBI_NOTUSED(hs); + return in_near; +} + +static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples vertically for every one in input + int i; + STBI_NOTUSED(hs); + for (i=0; i < w; ++i) + out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); + return out; +} + +static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples horizontally for every one in input + int i; + stbi_uc *input = in_near; + + if (w == 1) { + // if only one sample, can't do any interpolation + out[0] = out[1] = input[0]; + return out; + } + + out[0] = input[0]; + out[1] = stbi__div4(input[0]*3 + input[1] + 2); + for (i=1; i < w-1; ++i) { + int n = 3*input[i]+2; + out[i*2+0] = stbi__div4(n+input[i-1]); + out[i*2+1] = stbi__div4(n+input[i+1]); + } + out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); + out[i*2+1] = input[w-1]; + + STBI_NOTUSED(in_far); + STBI_NOTUSED(hs); + + return out; +} + +#define stbi__div16(x) ((stbi_uc) ((x) >> 4)) + +static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i,t0,t1; + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + out[0] = stbi__div4(t1+2); + for (i=1; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i=0,t0,t1; + + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + // process groups of 8 pixels for as long as we can. + // note we can't handle the last pixel in a row in this loop + // because we need to handle the filter boundary conditions. + for (; i < ((w-1) & ~7); i += 8) { +#if defined(STBI_SSE2) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + __m128i zero = _mm_setzero_si128(); + __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); + __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); + __m128i farw = _mm_unpacklo_epi8(farb, zero); + __m128i nearw = _mm_unpacklo_epi8(nearb, zero); + __m128i diff = _mm_sub_epi16(farw, nearw); + __m128i nears = _mm_slli_epi16(nearw, 2); + __m128i curr = _mm_add_epi16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + __m128i prv0 = _mm_slli_si128(curr, 2); + __m128i nxt0 = _mm_srli_si128(curr, 2); + __m128i prev = _mm_insert_epi16(prv0, t1, 0); + __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + __m128i bias = _mm_set1_epi16(8); + __m128i curs = _mm_slli_epi16(curr, 2); + __m128i prvd = _mm_sub_epi16(prev, curr); + __m128i nxtd = _mm_sub_epi16(next, curr); + __m128i curb = _mm_add_epi16(curs, bias); + __m128i even = _mm_add_epi16(prvd, curb); + __m128i odd = _mm_add_epi16(nxtd, curb); + + // interleave even and odd pixels, then undo scaling. + __m128i int0 = _mm_unpacklo_epi16(even, odd); + __m128i int1 = _mm_unpackhi_epi16(even, odd); + __m128i de0 = _mm_srli_epi16(int0, 4); + __m128i de1 = _mm_srli_epi16(int1, 4); + + // pack and write output + __m128i outv = _mm_packus_epi16(de0, de1); + _mm_storeu_si128((__m128i *) (out + i*2), outv); +#elif defined(STBI_NEON) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + uint8x8_t farb = vld1_u8(in_far + i); + uint8x8_t nearb = vld1_u8(in_near + i); + int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); + int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); + int16x8_t curr = vaddq_s16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + int16x8_t prv0 = vextq_s16(curr, curr, 7); + int16x8_t nxt0 = vextq_s16(curr, curr, 1); + int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); + int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + int16x8_t curs = vshlq_n_s16(curr, 2); + int16x8_t prvd = vsubq_s16(prev, curr); + int16x8_t nxtd = vsubq_s16(next, curr); + int16x8_t even = vaddq_s16(curs, prvd); + int16x8_t odd = vaddq_s16(curs, nxtd); + + // undo scaling and round, then store with even/odd phases interleaved + uint8x8x2_t o; + o.val[0] = vqrshrun_n_s16(even, 4); + o.val[1] = vqrshrun_n_s16(odd, 4); + vst2_u8(out + i*2, o); #endif -} stbi_loader; -// register a loader by filling out the above structure (you must defined ALL functions) -// returns 1 if added or already added, 0 if not added (too many loaders) -// NOT THREADSAFE -extern int stbi_register_loader(stbi_loader *loader); - -// define faster low-level operations (typically SIMD support) -#if STBI_SIMD -typedef void (*stbi_idct_8x8)(uint8 *out, int out_stride, short data[64], unsigned short *dequantize); -// compute an integer IDCT on "input" -// input[x] = data[x] * dequantize[x] -// write results to 'out': 64 samples, each run of 8 spaced by 'out_stride' -// CLAMP results to 0..255 -typedef void (*stbi_YCbCr_to_RGB_run)(uint8 *output, uint8 const *y, uint8 const *cb, uint8 const *cr, int count, int step); -// compute a conversion from YCbCr to RGB -// 'count' pixels -// write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B -// y: Y input channel -// cb: Cb input channel; scale/biased to be 0..255 -// cr: Cr input channel; scale/biased to be 0..255 - -extern void stbi_install_idct(stbi_idct_8x8 func); -extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func); -#endif // STBI_SIMD + // "previous" value for next iter + t1 = 3*in_near[i+7] + in_far[i+7]; + } -#ifdef __cplusplus + t0 = t1; + t1 = 3*in_near[i] + in_far[i]; + out[i*2] = stbi__div16(3*t1 + t0 + 8); + + for (++i; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} +#endif + +static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // resample with nearest-neighbor + int i,j; + STBI_NOTUSED(in_far); + for (i=0; i < w; ++i) + for (j=0; j < hs; ++j) + out[i*hs+j] = in_near[i]; + return out; +} + +#ifdef STBI_JPEG_OLD +// this is the same YCbCr-to-RGB calculation that stb_image has used +// historically before the algorithm changes in 1.49 +#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) +static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) +{ + int i; + for (i=0; i < count; ++i) { + int y_fixed = (y[i] << 16) + 32768; // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr*float2fixed(1.40200f); + g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); + b = y_fixed + cb*float2fixed(1.77200f); + r >>= 16; + g >>= 16; + b >>= 16; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#else +// this is a reduced-precision calculation of YCbCr-to-RGB introduced +// to make sure the code produces the same results in both SIMD and scalar +#define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) +static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) +{ + int i; + for (i=0; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* float2fixed(1.40200f); + g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#endif + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) +{ + int i = 0; + +#ifdef STBI_SSE2 + // step == 3 is pretty ugly on the final interleave, and i'm not convinced + // it's useful in practice (you wouldn't use it for textures, for example). + // so just accelerate step == 4 case. + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + __m128i signflip = _mm_set1_epi8(-0x80); + __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); + __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); + __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); + __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); + __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); + __m128i xw = _mm_set1_epi16(255); // alpha channel + + for (; i+7 < count; i += 8) { + // load + __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); + __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); + __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); + __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 + __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 + + // unpack to short (and left-shift cr, cb by 8) + __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); + __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); + __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); + + // color transform + __m128i yws = _mm_srli_epi16(yw, 4); + __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); + __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); + __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); + __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); + __m128i rws = _mm_add_epi16(cr0, yws); + __m128i gwt = _mm_add_epi16(cb0, yws); + __m128i bws = _mm_add_epi16(yws, cb1); + __m128i gws = _mm_add_epi16(gwt, cr1); + + // descale + __m128i rw = _mm_srai_epi16(rws, 4); + __m128i bw = _mm_srai_epi16(bws, 4); + __m128i gw = _mm_srai_epi16(gws, 4); + + // back to byte, set up for transpose + __m128i brb = _mm_packus_epi16(rw, bw); + __m128i gxb = _mm_packus_epi16(gw, xw); + + // transpose to interleave channels + __m128i t0 = _mm_unpacklo_epi8(brb, gxb); + __m128i t1 = _mm_unpackhi_epi8(brb, gxb); + __m128i o0 = _mm_unpacklo_epi16(t0, t1); + __m128i o1 = _mm_unpackhi_epi16(t0, t1); + + // store + _mm_storeu_si128((__m128i *) (out + 0), o0); + _mm_storeu_si128((__m128i *) (out + 16), o1); + out += 32; + } + } +#endif + +#ifdef STBI_NEON + // in this version, step=3 support would be easy to add. but is there demand? + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + uint8x8_t signflip = vdup_n_u8(0x80); + int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); + int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); + int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); + int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); + + for (; i+7 < count; i += 8) { + // load + uint8x8_t y_bytes = vld1_u8(y + i); + uint8x8_t cr_bytes = vld1_u8(pcr + i); + uint8x8_t cb_bytes = vld1_u8(pcb + i); + int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); + int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); + + // expand to s16 + int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); + int16x8_t crw = vshll_n_s8(cr_biased, 7); + int16x8_t cbw = vshll_n_s8(cb_biased, 7); + + // color transform + int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); + int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); + int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); + int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); + int16x8_t rws = vaddq_s16(yws, cr0); + int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); + int16x8_t bws = vaddq_s16(yws, cb1); + + // undo scaling, round, convert to byte + uint8x8x4_t o; + o.val[0] = vqrshrun_n_s16(rws, 4); + o.val[1] = vqrshrun_n_s16(gws, 4); + o.val[2] = vqrshrun_n_s16(bws, 4); + o.val[3] = vdup_n_u8(255); + + // store, interleaving r/g/b/a + vst4_u8(out, o); + out += 8*4; + } + } +#endif + + for (; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* float2fixed(1.40200f); + g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#endif + +// set up the kernels +static void stbi__setup_jpeg(stbi__jpeg *j) +{ + j->idct_block_kernel = stbi__idct_block; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; + +#ifdef STBI_SSE2 + if (stbi__sse2_available()) { + j->idct_block_kernel = stbi__idct_simd; + #ifndef STBI_JPEG_OLD + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + #endif + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; + } +#endif + +#ifdef STBI_NEON + j->idct_block_kernel = stbi__idct_simd; + #ifndef STBI_JPEG_OLD + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + #endif + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; +#endif +} + +// clean up the temporary component buffers +static void stbi__cleanup_jpeg(stbi__jpeg *j) +{ + stbi__free_jpeg_components(j, j->s->img_n, 0); +} + +typedef struct +{ + resample_row_func resample; + stbi_uc *line0,*line1; + int hs,vs; // expansion factor in each axis + int w_lores; // horizontal pixels pre-expansion + int ystep; // how far through vertical expansion we are + int ypos; // which pre-expansion row we're on +} stbi__resample; + +static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) +{ + int n, decode_n; + z->s->img_n = 0; // make stbi__cleanup_jpeg safe + + // validate req_comp + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + + // load a jpeg image from whichever source, but leave in YCbCr format + if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } + + // determine actual number of components to generate + n = req_comp ? req_comp : z->s->img_n; + + if (z->s->img_n == 3 && n < 3) + decode_n = 1; + else + decode_n = z->s->img_n; + + // resample and color-convert + { + int k; + unsigned int i,j; + stbi_uc *output; + stbi_uc *coutput[4]; + + stbi__resample res_comp[4]; + + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + + // allocate line buffer big enough for upsampling off the edges + // with upsample factor of 4 + z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); + if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + r->hs = z->img_h_max / z->img_comp[k].h; + r->vs = z->img_v_max / z->img_comp[k].v; + r->ystep = r->vs >> 1; + r->w_lores = (z->s->img_x + r->hs-1) / r->hs; + r->ypos = 0; + r->line0 = r->line1 = z->img_comp[k].data; + + if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; + else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; + else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; + else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; + else r->resample = stbi__resample_row_generic; + } + + // can't error after this so, this is safe + output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); + if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + // now go ahead and resample + for (j=0; j < z->s->img_y; ++j) { + stbi_uc *out = output + n * z->s->img_x * j; + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + int y_bot = r->ystep >= (r->vs >> 1); + coutput[k] = r->resample(z->img_comp[k].linebuf, + y_bot ? r->line1 : r->line0, + y_bot ? r->line0 : r->line1, + r->w_lores, r->hs); + if (++r->ystep >= r->vs) { + r->ystep = 0; + r->line0 = r->line1; + if (++r->ypos < z->img_comp[k].y) + r->line1 += z->img_comp[k].w2; + } + } + if (n >= 3) { + stbi_uc *y = coutput[0]; + if (z->s->img_n == 3) { + if (z->rgb == 3) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = y[i]; + out[1] = coutput[1][i]; + out[2] = coutput[2][i]; + out[3] = 255; + out += n; + } + } else { + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } + } else + for (i=0; i < z->s->img_x; ++i) { + out[0] = out[1] = out[2] = y[i]; + out[3] = 255; // not used if n==3 + out += n; + } + } else { + stbi_uc *y = coutput[0]; + if (n == 1) + for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; + else + for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; + } + } + stbi__cleanup_jpeg(z); + *out_x = z->s->img_x; + *out_y = z->s->img_y; + if (comp) *comp = z->s->img_n; // report original components, not output + return output; + } +} + +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + unsigned char* result; + stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); + j->s = s; + stbi__setup_jpeg(j); + result = load_jpeg_image(j, x,y,comp,req_comp); + STBI_FREE(j); + return result; +} + +static int stbi__jpeg_test(stbi__context *s) +{ + int r; + stbi__jpeg j; + j.s = s; + stbi__setup_jpeg(&j); + r = stbi__decode_jpeg_header(&j, STBI__SCAN_type); + stbi__rewind(s); + return r; +} + +static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) +{ + if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { + stbi__rewind( j->s ); + return 0; + } + if (x) *x = j->s->img_x; + if (y) *y = j->s->img_y; + if (comp) *comp = j->s->img_n; + return 1; +} + +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) +{ + int result; + stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); + j->s = s; + result = stbi__jpeg_info_raw(j, x, y, comp); + STBI_FREE(j); + return result; +} +#endif + +// public domain zlib decode v0.2 Sean Barrett 2006-11-18 +// simple implementation +// - all input must be provided in an upfront buffer +// - all output is written to a single output buffer (can malloc/realloc) +// performance +// - fast huffman + +#ifndef STBI_NO_ZLIB + +// fast-way is faster to check than jpeg huffman, but slow way is slower +#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables +#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) + +// zlib-style huffman encoding +// (jpegs packs from left, zlib from right, so can't share code) +typedef struct +{ + stbi__uint16 fast[1 << STBI__ZFAST_BITS]; + stbi__uint16 firstcode[16]; + int maxcode[17]; + stbi__uint16 firstsymbol[16]; + stbi_uc size[288]; + stbi__uint16 value[288]; +} stbi__zhuffman; + +stbi_inline static int stbi__bitreverse16(int n) +{ + n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); + n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); + n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); + n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); + return n; +} + +stbi_inline static int stbi__bit_reverse(int v, int bits) +{ + STBI_ASSERT(bits <= 16); + // to bit reverse n bits, reverse 16 and shift + // e.g. 11 bits, bit reverse and shift away 5 + return stbi__bitreverse16(v) >> (16-bits); +} + +static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num) +{ + int i,k=0; + int code, next_code[16], sizes[17]; + + // DEFLATE spec for generating codes + memset(sizes, 0, sizeof(sizes)); + memset(z->fast, 0, sizeof(z->fast)); + for (i=0; i < num; ++i) + ++sizes[sizelist[i]]; + sizes[0] = 0; + for (i=1; i < 16; ++i) + if (sizes[i] > (1 << i)) + return stbi__err("bad sizes", "Corrupt PNG"); + code = 0; + for (i=1; i < 16; ++i) { + next_code[i] = code; + z->firstcode[i] = (stbi__uint16) code; + z->firstsymbol[i] = (stbi__uint16) k; + code = (code + sizes[i]); + if (sizes[i]) + if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); + z->maxcode[i] = code << (16-i); // preshift for inner loop + code <<= 1; + k += sizes[i]; + } + z->maxcode[16] = 0x10000; // sentinel + for (i=0; i < num; ++i) { + int s = sizelist[i]; + if (s) { + int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; + stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); + z->size [c] = (stbi_uc ) s; + z->value[c] = (stbi__uint16) i; + if (s <= STBI__ZFAST_BITS) { + int j = stbi__bit_reverse(next_code[s],s); + while (j < (1 << STBI__ZFAST_BITS)) { + z->fast[j] = fastv; + j += (1 << s); + } + } + ++next_code[s]; + } + } + return 1; +} + +// zlib-from-memory implementation for PNG reading +// because PNG allows splitting the zlib stream arbitrarily, +// and it's annoying structurally to have PNG call ZLIB call PNG, +// we require PNG read all the IDATs and combine them into a single +// memory buffer + +typedef struct +{ + stbi_uc *zbuffer, *zbuffer_end; + int num_bits; + stbi__uint32 code_buffer; + + char *zout; + char *zout_start; + char *zout_end; + int z_expandable; + + stbi__zhuffman z_length, z_distance; +} stbi__zbuf; + +stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) +{ + if (z->zbuffer >= z->zbuffer_end) return 0; + return *z->zbuffer++; +} + +static void stbi__fill_bits(stbi__zbuf *z) +{ + do { + STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); + z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits; + z->num_bits += 8; + } while (z->num_bits <= 24); +} + +stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) +{ + unsigned int k; + if (z->num_bits < n) stbi__fill_bits(z); + k = z->code_buffer & ((1 << n) - 1); + z->code_buffer >>= n; + z->num_bits -= n; + return k; +} + +static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s,k; + // not resolved by fast table, so compute it the slow way + // use jpeg approach, which requires MSbits at top + k = stbi__bit_reverse(a->code_buffer, 16); + for (s=STBI__ZFAST_BITS+1; ; ++s) + if (k < z->maxcode[s]) + break; + if (s == 16) return -1; // invalid code! + // code size is s, so: + b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; + STBI_ASSERT(z->size[b] == s); + a->code_buffer >>= s; + a->num_bits -= s; + return z->value[b]; +} + +stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s; + if (a->num_bits < 16) stbi__fill_bits(a); + b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; + if (b) { + s = b >> 9; + a->code_buffer >>= s; + a->num_bits -= s; + return b & 511; + } + return stbi__zhuffman_decode_slowpath(a, z); +} + +static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes +{ + char *q; + int cur, limit, old_limit; + z->zout = zout; + if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); + cur = (int) (z->zout - z->zout_start); + limit = old_limit = (int) (z->zout_end - z->zout_start); + while (cur + n > limit) + limit *= 2; + q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); + STBI_NOTUSED(old_limit); + if (q == NULL) return stbi__err("outofmem", "Out of memory"); + z->zout_start = q; + z->zout = q + cur; + z->zout_end = q + limit; + return 1; +} + +static int stbi__zlength_base[31] = { + 3,4,5,6,7,8,9,10,11,13, + 15,17,19,23,27,31,35,43,51,59, + 67,83,99,115,131,163,195,227,258,0,0 }; + +static int stbi__zlength_extra[31]= +{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + +static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, +257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; + +static int stbi__zdist_extra[32] = +{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; + +static int stbi__parse_huffman_block(stbi__zbuf *a) +{ + char *zout = a->zout; + for(;;) { + int z = stbi__zhuffman_decode(a, &a->z_length); + if (z < 256) { + if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes + if (zout >= a->zout_end) { + if (!stbi__zexpand(a, zout, 1)) return 0; + zout = a->zout; + } + *zout++ = (char) z; + } else { + stbi_uc *p; + int len,dist; + if (z == 256) { + a->zout = zout; + return 1; + } + z -= 257; + len = stbi__zlength_base[z]; + if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); + z = stbi__zhuffman_decode(a, &a->z_distance); + if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); + dist = stbi__zdist_base[z]; + if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); + if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); + if (zout + len > a->zout_end) { + if (!stbi__zexpand(a, zout, len)) return 0; + zout = a->zout; + } + p = (stbi_uc *) (zout - dist); + if (dist == 1) { // run of one byte; common in images. + stbi_uc v = *p; + if (len) { do *zout++ = v; while (--len); } + } else { + if (len) { do *zout++ = *p++; while (--len); } + } + } + } +} + +static int stbi__compute_huffman_codes(stbi__zbuf *a) +{ + static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + stbi__zhuffman z_codelength; + stbi_uc lencodes[286+32+137];//padding for maximum single op + stbi_uc codelength_sizes[19]; + int i,n; + + int hlit = stbi__zreceive(a,5) + 257; + int hdist = stbi__zreceive(a,5) + 1; + int hclen = stbi__zreceive(a,4) + 4; + int ntot = hlit + hdist; + + memset(codelength_sizes, 0, sizeof(codelength_sizes)); + for (i=0; i < hclen; ++i) { + int s = stbi__zreceive(a,3); + codelength_sizes[length_dezigzag[i]] = (stbi_uc) s; + } + if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; + + n = 0; + while (n < ntot) { + int c = stbi__zhuffman_decode(a, &z_codelength); + if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG"); + if (c < 16) + lencodes[n++] = (stbi_uc) c; + else { + stbi_uc fill = 0; + if (c == 16) { + c = stbi__zreceive(a,2)+3; + if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG"); + fill = lencodes[n-1]; + } else if (c == 17) + c = stbi__zreceive(a,3)+3; + else { + STBI_ASSERT(c == 18); + c = stbi__zreceive(a,7)+11; + } + if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG"); + memset(lencodes+n, fill, c); + n += c; + } + } + if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG"); + if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; + return 1; +} + +static int stbi__parse_uncompressed_block(stbi__zbuf *a) +{ + stbi_uc header[4]; + int len,nlen,k; + if (a->num_bits & 7) + stbi__zreceive(a, a->num_bits & 7); // discard + // drain the bit-packed data into header + k = 0; + while (a->num_bits > 0) { + header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check + a->code_buffer >>= 8; + a->num_bits -= 8; + } + STBI_ASSERT(a->num_bits == 0); + // now fill header the normal way + while (k < 4) + header[k++] = stbi__zget8(a); + len = header[1] * 256 + header[0]; + nlen = header[3] * 256 + header[2]; + if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); + if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); + if (a->zout + len > a->zout_end) + if (!stbi__zexpand(a, a->zout, len)) return 0; + memcpy(a->zout, a->zbuffer, len); + a->zbuffer += len; + a->zout += len; + return 1; +} + +static int stbi__parse_zlib_header(stbi__zbuf *a) +{ + int cmf = stbi__zget8(a); + int cm = cmf & 15; + /* int cinfo = cmf >> 4; */ + int flg = stbi__zget8(a); + if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec + if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png + if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png + // window = 1 << (8 + cinfo)... but who cares, we fully buffer output + return 1; +} + +// @TODO: should statically initialize these for optimal thread safety +static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32]; +static void stbi__init_zdefaults(void) +{ + int i; // use <= to match clearly with spec + for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; + for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; + for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; + for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; + + for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; +} + +static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) +{ + int final, type; + if (parse_header) + if (!stbi__parse_zlib_header(a)) return 0; + a->num_bits = 0; + a->code_buffer = 0; + do { + final = stbi__zreceive(a,1); + type = stbi__zreceive(a,2); + if (type == 0) { + if (!stbi__parse_uncompressed_block(a)) return 0; + } else if (type == 3) { + return 0; + } else { + if (type == 1) { + // use fixed code lengths + if (!stbi__zdefault_distance[31]) stbi__init_zdefaults(); + if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; + } else { + if (!stbi__compute_huffman_codes(a)) return 0; + } + if (!stbi__parse_huffman_block(a)) return 0; + } + } while (!final); + return 1; +} + +static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) +{ + a->zout_start = obuf; + a->zout = obuf; + a->zout_end = obuf + olen; + a->z_expandable = exp; + + return stbi__parse_zlib(a, parse_header); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) +{ + return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) + return (int) (a.zout - a.zout_start); + else + return -1; +} + +STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(16384); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer+len; + if (stbi__do_zlib(&a, p, 16384, 1, 0)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) + return (int) (a.zout - a.zout_start); + else + return -1; +} +#endif + +// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 +// simple implementation +// - only 8-bit samples +// - no CRC checking +// - allocates lots of intermediate memory +// - avoids problem of streaming data between subsystems +// - avoids explicit window management +// performance +// - uses stb_zlib, a PD zlib implementation with fast huffman decoding + +#ifndef STBI_NO_PNG +typedef struct +{ + stbi__uint32 length; + stbi__uint32 type; +} stbi__pngchunk; + +static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) +{ + stbi__pngchunk c; + c.length = stbi__get32be(s); + c.type = stbi__get32be(s); + return c; +} + +static int stbi__check_png_header(stbi__context *s) +{ + static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; + int i; + for (i=0; i < 8; ++i) + if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); + return 1; +} + +typedef struct +{ + stbi__context *s; + stbi_uc *idata, *expanded, *out; + int depth; +} stbi__png; + + +enum { + STBI__F_none=0, + STBI__F_sub=1, + STBI__F_up=2, + STBI__F_avg=3, + STBI__F_paeth=4, + // synthetic filters used for first scanline to avoid needing a dummy row of 0s + STBI__F_avg_first, + STBI__F_paeth_first +}; + +static stbi_uc first_row_filter[5] = +{ + STBI__F_none, + STBI__F_sub, + STBI__F_none, + STBI__F_avg_first, + STBI__F_paeth_first +}; + +static int stbi__paeth(int a, int b, int c) +{ + int p = a + b - c; + int pa = abs(p-a); + int pb = abs(p-b); + int pc = abs(p-c); + if (pa <= pb && pa <= pc) return a; + if (pb <= pc) return b; + return c; +} + +static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; + +// create the png data from post-deflated data +static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) +{ + int bytes = (depth == 16? 2 : 1); + stbi__context *s = a->s; + stbi__uint32 i,j,stride = x*out_n*bytes; + stbi__uint32 img_len, img_width_bytes; + int k; + int img_n = s->img_n; // copy it into a local for later + + int output_bytes = out_n*bytes; + int filter_bytes = img_n*bytes; + int width = x; + + STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); + a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into + if (!a->out) return stbi__err("outofmem", "Out of memory"); + + img_width_bytes = (((img_n * x * depth) + 7) >> 3); + img_len = (img_width_bytes + 1) * y; + if (s->img_x == x && s->img_y == y) { + if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG"); + } else { // interlaced: + if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); + } + + for (j=0; j < y; ++j) { + stbi_uc *cur = a->out + stride*j; + stbi_uc *prior = cur - stride; + int filter = *raw++; + + if (filter > 4) + return stbi__err("invalid filter","Corrupt PNG"); + + if (depth < 8) { + STBI_ASSERT(img_width_bytes <= x); + cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place + filter_bytes = 1; + width = img_width_bytes; + } + + // if first row, use special filter that doesn't sample previous row + if (j == 0) filter = first_row_filter[filter]; + + // handle first byte explicitly + for (k=0; k < filter_bytes; ++k) { + switch (filter) { + case STBI__F_none : cur[k] = raw[k]; break; + case STBI__F_sub : cur[k] = raw[k]; break; + case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; + case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break; + case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break; + case STBI__F_avg_first : cur[k] = raw[k]; break; + case STBI__F_paeth_first: cur[k] = raw[k]; break; + } + } + + if (depth == 8) { + if (img_n != out_n) + cur[img_n] = 255; // first pixel + raw += img_n; + cur += out_n; + prior += out_n; + } else if (depth == 16) { + if (img_n != out_n) { + cur[filter_bytes] = 255; // first pixel top byte + cur[filter_bytes+1] = 255; // first pixel bottom byte + } + raw += filter_bytes; + cur += output_bytes; + prior += output_bytes; + } else { + raw += 1; + cur += 1; + prior += 1; + } + + // this is a little gross, so that we don't switch per-pixel or per-component + if (depth < 8 || img_n == out_n) { + int nk = (width - 1)*filter_bytes; + #define STBI__CASE(f) \ + case f: \ + for (k=0; k < nk; ++k) + switch (filter) { + // "none" filter turns into a memcpy here; make that explicit. + case STBI__F_none: memcpy(cur, raw, nk); break; + STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break; + STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; + STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break; + STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break; + STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break; + STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); } break; + } + #undef STBI__CASE + raw += nk; + } else { + STBI_ASSERT(img_n+1 == out_n); + #define STBI__CASE(f) \ + case f: \ + for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \ + for (k=0; k < filter_bytes; ++k) + switch (filter) { + STBI__CASE(STBI__F_none) { cur[k] = raw[k]; } break; + STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break; + STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; + STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break; + STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break; + STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break; + STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],0,0)); } break; + } + #undef STBI__CASE + + // the loop above sets the high byte of the pixels' alpha, but for + // 16 bit png files we also need the low byte set. we'll do that here. + if (depth == 16) { + cur = a->out + stride*j; // start at the beginning of the row again + for (i=0; i < x; ++i,cur+=output_bytes) { + cur[filter_bytes+1] = 255; + } + } + } + } + + // we make a separate pass to expand bits to pixels; for performance, + // this could run two scanlines behind the above code, so it won't + // intefere with filtering but will still be in the cache. + if (depth < 8) { + for (j=0; j < y; ++j) { + stbi_uc *cur = a->out + stride*j; + stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes; + // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit + // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop + stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range + + // note that the final byte might overshoot and write more data than desired. + // we can allocate enough data that this never writes out of memory, but it + // could also overwrite the next scanline. can it overwrite non-empty data + // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel. + // so we need to explicitly clamp the final ones + + if (depth == 4) { + for (k=x*img_n; k >= 2; k-=2, ++in) { + *cur++ = scale * ((*in >> 4) ); + *cur++ = scale * ((*in ) & 0x0f); + } + if (k > 0) *cur++ = scale * ((*in >> 4) ); + } else if (depth == 2) { + for (k=x*img_n; k >= 4; k-=4, ++in) { + *cur++ = scale * ((*in >> 6) ); + *cur++ = scale * ((*in >> 4) & 0x03); + *cur++ = scale * ((*in >> 2) & 0x03); + *cur++ = scale * ((*in ) & 0x03); + } + if (k > 0) *cur++ = scale * ((*in >> 6) ); + if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03); + if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03); + } else if (depth == 1) { + for (k=x*img_n; k >= 8; k-=8, ++in) { + *cur++ = scale * ((*in >> 7) ); + *cur++ = scale * ((*in >> 6) & 0x01); + *cur++ = scale * ((*in >> 5) & 0x01); + *cur++ = scale * ((*in >> 4) & 0x01); + *cur++ = scale * ((*in >> 3) & 0x01); + *cur++ = scale * ((*in >> 2) & 0x01); + *cur++ = scale * ((*in >> 1) & 0x01); + *cur++ = scale * ((*in ) & 0x01); + } + if (k > 0) *cur++ = scale * ((*in >> 7) ); + if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01); + if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01); + if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01); + if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01); + if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01); + if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01); + } + if (img_n != out_n) { + int q; + // insert alpha = 255 + cur = a->out + stride*j; + if (img_n == 1) { + for (q=x-1; q >= 0; --q) { + cur[q*2+1] = 255; + cur[q*2+0] = cur[q]; + } + } else { + STBI_ASSERT(img_n == 3); + for (q=x-1; q >= 0; --q) { + cur[q*4+3] = 255; + cur[q*4+2] = cur[q*3+2]; + cur[q*4+1] = cur[q*3+1]; + cur[q*4+0] = cur[q*3+0]; + } + } + } + } + } else if (depth == 16) { + // force the image data from big-endian to platform-native. + // this is done in a separate pass due to the decoding relying + // on the data being untouched, but could probably be done + // per-line during decode if care is taken. + stbi_uc *cur = a->out; + stbi__uint16 *cur16 = (stbi__uint16*)cur; + + for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) { + *cur16 = (cur[0] << 8) | cur[1]; + } + } + + return 1; +} + +static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) +{ + int bytes = (depth == 16 ? 2 : 1); + int out_bytes = out_n * bytes; + stbi_uc *final; + int p; + if (!interlaced) + return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); + + // de-interlacing + final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0); + for (p=0; p < 7; ++p) { + int xorig[] = { 0,4,0,2,0,1,0 }; + int yorig[] = { 0,0,4,0,2,0,1 }; + int xspc[] = { 8,8,4,4,2,2,1 }; + int yspc[] = { 8,8,8,4,4,2,2 }; + int i,j,x,y; + // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 + x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; + y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; + if (x && y) { + stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; + if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { + STBI_FREE(final); + return 0; + } + for (j=0; j < y; ++j) { + for (i=0; i < x; ++i) { + int out_y = j*yspc[p]+yorig[p]; + int out_x = i*xspc[p]+xorig[p]; + memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, + a->out + (j*x+i)*out_bytes, out_bytes); + } + } + STBI_FREE(a->out); + image_data += img_len; + image_data_len -= img_len; + } + } + a->out = final; + + return 1; +} + +static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + // compute color-based transparency, assuming we've + // already got 255 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i=0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 255); + p += 2; + } + } else { + for (i=0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi__uint16 *p = (stbi__uint16*) z->out; + + // compute color-based transparency, assuming we've + // already got 65535 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i = 0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 65535); + p += 2; + } + } else { + for (i = 0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) +{ + stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; + stbi_uc *p, *temp_out, *orig = a->out; + + p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0); + if (p == NULL) return stbi__err("outofmem", "Out of memory"); + + // between here and free(out) below, exitting would leak + temp_out = p; + + if (pal_img_n == 3) { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p += 3; + } + } else { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p[3] = palette[n+3]; + p += 4; + } + } + STBI_FREE(a->out); + a->out = temp_out; + + STBI_NOTUSED(len); + + return 1; +} + +static int stbi__unpremultiply_on_load = 0; +static int stbi__de_iphone_flag = 0; + +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) +{ + stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) +{ + stbi__de_iphone_flag = flag_true_if_should_convert; +} + +static void stbi__de_iphone(stbi__png *z) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + if (s->img_out_n == 3) { // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 3; + } + } else { + STBI_ASSERT(s->img_out_n == 4); + if (stbi__unpremultiply_on_load) { + // convert bgr to rgb and unpremultiply + for (i=0; i < pixel_count; ++i) { + stbi_uc a = p[3]; + stbi_uc t = p[0]; + if (a) { + p[0] = p[2] * 255 / a; + p[1] = p[1] * 255 / a; + p[2] = t * 255 / a; + } else { + p[0] = p[2]; + p[2] = t; + } + p += 4; + } + } else { + // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 4; + } + } + } +} + +#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) + +static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) +{ + stbi_uc palette[1024], pal_img_n=0; + stbi_uc has_trans=0, tc[3]; + stbi__uint16 tc16[3]; + stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; + int first=1,k,interlace=0, color=0, is_iphone=0; + stbi__context *s = z->s; + + z->expanded = NULL; + z->idata = NULL; + z->out = NULL; + + if (!stbi__check_png_header(s)) return 0; + + if (scan == STBI__SCAN_type) return 1; + + for (;;) { + stbi__pngchunk c = stbi__get_chunk_header(s); + switch (c.type) { + case STBI__PNG_TYPE('C','g','B','I'): + is_iphone = 1; + stbi__skip(s, c.length); + break; + case STBI__PNG_TYPE('I','H','D','R'): { + int comp,filter; + if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); + first = 0; + if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); + s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); + s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); + z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); + color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); + comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); + filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); + interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); + if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); + if (!pal_img_n) { + s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); + if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); + if (scan == STBI__SCAN_header) return 1; + } else { + // if paletted, then pal_n is our final components, and + // img_n is # components to decompress/filter. + s->img_n = 1; + if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); + // if SCAN_header, have to scan to see if we have a tRNS + } + break; + } + + case STBI__PNG_TYPE('P','L','T','E'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG"); + pal_len = c.length / 3; + if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG"); + for (i=0; i < pal_len; ++i) { + palette[i*4+0] = stbi__get8(s); + palette[i*4+1] = stbi__get8(s); + palette[i*4+2] = stbi__get8(s); + palette[i*4+3] = 255; + } + break; + } + + case STBI__PNG_TYPE('t','R','N','S'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG"); + if (pal_img_n) { + if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } + if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG"); + if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG"); + pal_img_n = 4; + for (i=0; i < c.length; ++i) + palette[i*4+3] = stbi__get8(s); + } else { + if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); + if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); + has_trans = 1; + if (z->depth == 16) { + for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is + } else { + for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger + } + } + break; + } + + case STBI__PNG_TYPE('I','D','A','T'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); + if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } + if ((int)(ioff + c.length) < (int)ioff) return 0; + if (ioff + c.length > idata_limit) { + stbi__uint32 idata_limit_old = idata_limit; + stbi_uc *p; + if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; + while (ioff + c.length > idata_limit) + idata_limit *= 2; + STBI_NOTUSED(idata_limit_old); + p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory"); + z->idata = p; + } + if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG"); + ioff += c.length; + break; + } + + case STBI__PNG_TYPE('I','E','N','D'): { + stbi__uint32 raw_len, bpl; + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (scan != STBI__SCAN_load) return 1; + if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG"); + // initial guess for decoded data size to avoid unnecessary reallocs + bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component + raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; + z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); + if (z->expanded == NULL) return 0; // zlib should set error + STBI_FREE(z->idata); z->idata = NULL; + if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) + s->img_out_n = s->img_n+1; + else + s->img_out_n = s->img_n; + if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0; + if (has_trans) { + if (z->depth == 16) { + if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0; + } else { + if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0; + } + } + if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) + stbi__de_iphone(z); + if (pal_img_n) { + // pal_img_n == 3 or 4 + s->img_n = pal_img_n; // record the actual colors we had + s->img_out_n = pal_img_n; + if (req_comp >= 3) s->img_out_n = req_comp; + if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) + return 0; + } + STBI_FREE(z->expanded); z->expanded = NULL; + return 1; + } + + default: + // if critical, fail + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if ((c.type & (1 << 29)) == 0) { + #ifndef STBI_NO_FAILURE_STRINGS + // not threadsafe + static char invalid_chunk[] = "XXXX PNG chunk not known"; + invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); + invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); + invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); + invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); + #endif + return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); + } + stbi__skip(s, c.length); + break; + } + // end of PNG chunk, read and skip CRC + stbi__get32be(s); + } +} + +static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri) +{ + void *result=NULL; + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { + ri->bits_per_channel = p->depth; + result = p->out; + p->out = NULL; + if (req_comp && req_comp != p->s->img_out_n) { + if (ri->bits_per_channel == 8) + result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + else + result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + p->s->img_out_n = req_comp; + if (result == NULL) return result; + } + *x = p->s->img_x; + *y = p->s->img_y; + if (n) *n = p->s->img_n; + } + STBI_FREE(p->out); p->out = NULL; + STBI_FREE(p->expanded); p->expanded = NULL; + STBI_FREE(p->idata); p->idata = NULL; + + return result; +} + +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi__png p; + p.s = s; + return stbi__do_png(&p, x,y,comp,req_comp, ri); +} + +static int stbi__png_test(stbi__context *s) +{ + int r; + r = stbi__check_png_header(s); + stbi__rewind(s); + return r; +} + +static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) +{ + if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { + stbi__rewind( p->s ); + return 0; + } + if (x) *x = p->s->img_x; + if (y) *y = p->s->img_y; + if (comp) *comp = p->s->img_n; + return 1; +} + +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__png p; + p.s = s; + return stbi__png_info_raw(&p, x, y, comp); +} +#endif + +// Microsoft/Windows BMP image + +#ifndef STBI_NO_BMP +static int stbi__bmp_test_raw(stbi__context *s) +{ + int r; + int sz; + if (stbi__get8(s) != 'B') return 0; + if (stbi__get8(s) != 'M') return 0; + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + stbi__get32le(s); // discard data offset + sz = stbi__get32le(s); + r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); + return r; +} + +static int stbi__bmp_test(stbi__context *s) +{ + int r = stbi__bmp_test_raw(s); + stbi__rewind(s); + return r; +} + + +// returns 0..31 for the highest set bit +static int stbi__high_bit(unsigned int z) +{ + int n=0; + if (z == 0) return -1; + if (z >= 0x10000) n += 16, z >>= 16; + if (z >= 0x00100) n += 8, z >>= 8; + if (z >= 0x00010) n += 4, z >>= 4; + if (z >= 0x00004) n += 2, z >>= 2; + if (z >= 0x00002) n += 1, z >>= 1; + return n; +} + +static int stbi__bitcount(unsigned int a) +{ + a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 + a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 + a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits + a = (a + (a >> 8)); // max 16 per 8 bits + a = (a + (a >> 16)); // max 32 per 8 bits + return a & 0xff; +} + +static int stbi__shiftsigned(int v, int shift, int bits) +{ + int result; + int z=0; + + if (shift < 0) v <<= -shift; + else v >>= shift; + result = v; + + z = bits; + while (z < 8) { + result += v >> z; + z += bits; + } + return result; +} + +typedef struct +{ + int bpp, offset, hsz; + unsigned int mr,mg,mb,ma, all_a; +} stbi__bmp_data; + +static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) +{ + int hsz; + if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + info->offset = stbi__get32le(s); + info->hsz = hsz = stbi__get32le(s); + info->mr = info->mg = info->mb = info->ma = 0; + + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); + if (hsz == 12) { + s->img_x = stbi__get16le(s); + s->img_y = stbi__get16le(s); + } else { + s->img_x = stbi__get32le(s); + s->img_y = stbi__get32le(s); + } + if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); + info->bpp = stbi__get16le(s); + if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit"); + if (hsz != 12) { + int compress = stbi__get32le(s); + if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); + stbi__get32le(s); // discard sizeof + stbi__get32le(s); // discard hres + stbi__get32le(s); // discard vres + stbi__get32le(s); // discard colorsused + stbi__get32le(s); // discard max important + if (hsz == 40 || hsz == 56) { + if (hsz == 56) { + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + } + if (info->bpp == 16 || info->bpp == 32) { + if (compress == 0) { + if (info->bpp == 32) { + info->mr = 0xffu << 16; + info->mg = 0xffu << 8; + info->mb = 0xffu << 0; + info->ma = 0xffu << 24; + info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 + } else { + info->mr = 31u << 10; + info->mg = 31u << 5; + info->mb = 31u << 0; + } + } else if (compress == 3) { + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + // not documented, but generated by photoshop and handled by mspaint + if (info->mr == info->mg && info->mg == info->mb) { + // ?!?!? + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else { + int i; + if (hsz != 108 && hsz != 124) + return stbi__errpuc("bad BMP", "bad BMP"); + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + info->ma = stbi__get32le(s); + stbi__get32le(s); // discard color space + for (i=0; i < 12; ++i) + stbi__get32le(s); // discard color space parameters + if (hsz == 124) { + stbi__get32le(s); // discard rendering intent + stbi__get32le(s); // discard offset of profile data + stbi__get32le(s); // discard size of profile data + stbi__get32le(s); // discard reserved + } + } + } + return (void *) 1; +} + + +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + unsigned int mr=0,mg=0,mb=0,ma=0, all_a; + stbi_uc pal[256][4]; + int psize=0,i,j,width; + int flip_vertically, pad, target; + stbi__bmp_data info; + STBI_NOTUSED(ri); + + info.all_a = 255; + if (stbi__bmp_parse_header(s, &info) == NULL) + return NULL; // error code already set + + flip_vertically = ((int) s->img_y) > 0; + s->img_y = abs((int) s->img_y); + + mr = info.mr; + mg = info.mg; + mb = info.mb; + ma = info.ma; + all_a = info.all_a; + + if (info.hsz == 12) { + if (info.bpp < 24) + psize = (info.offset - 14 - 24) / 3; + } else { + if (info.bpp < 16) + psize = (info.offset - 14 - info.hsz) >> 2; + } + + s->img_n = ma ? 4 : 3; + if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 + target = req_comp; + else + target = s->img_n; // if they want monochrome, we'll post-convert + + // sanity-check size + if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0)) + return stbi__errpuc("too large", "Corrupt BMP"); + + out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + if (info.bpp < 16) { + int z=0; + if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } + for (i=0; i < psize; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + if (info.hsz != 12) stbi__get8(s); + pal[i][3] = 255; + } + stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); + if (info.bpp == 4) width = (s->img_x + 1) >> 1; + else if (info.bpp == 8) width = s->img_x; + else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } + pad = (-width)&3; + for (j=0; j < (int) s->img_y; ++j) { + for (i=0; i < (int) s->img_x; i += 2) { + int v=stbi__get8(s),v2=0; + if (info.bpp == 4) { + v2 = v & 15; + v >>= 4; + } + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + if (i+1 == (int) s->img_x) break; + v = (info.bpp == 8) ? stbi__get8(s) : v2; + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + } + stbi__skip(s, pad); + } + } else { + int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; + int z = 0; + int easy=0; + stbi__skip(s, info.offset - 14 - info.hsz); + if (info.bpp == 24) width = 3 * s->img_x; + else if (info.bpp == 16) width = 2*s->img_x; + else /* bpp = 32 and pad = 0 */ width=0; + pad = (-width) & 3; + if (info.bpp == 24) { + easy = 1; + } else if (info.bpp == 32) { + if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) + easy = 2; + } + if (!easy) { + if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } + // right shift amt to put high bit in position #7 + rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); + gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); + bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); + ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); + } + for (j=0; j < (int) s->img_y; ++j) { + if (easy) { + for (i=0; i < (int) s->img_x; ++i) { + unsigned char a; + out[z+2] = stbi__get8(s); + out[z+1] = stbi__get8(s); + out[z+0] = stbi__get8(s); + z += 3; + a = (easy == 2 ? stbi__get8(s) : 255); + all_a |= a; + if (target == 4) out[z++] = a; + } + } else { + int bpp = info.bpp; + for (i=0; i < (int) s->img_x; ++i) { + stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s)); + int a; + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); + a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); + all_a |= a; + if (target == 4) out[z++] = STBI__BYTECAST(a); + } + } + stbi__skip(s, pad); + } + } + + // if alpha channel is all 0s, replace with all 255s + if (target == 4 && all_a == 0) + for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) + out[i] = 255; + + if (flip_vertically) { + stbi_uc t; + for (j=0; j < (int) s->img_y>>1; ++j) { + stbi_uc *p1 = out + j *s->img_x*target; + stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; + for (i=0; i < (int) s->img_x*target; ++i) { + t = p1[i], p1[i] = p2[i], p2[i] = t; + } + } + } + + if (req_comp && req_comp != target) { + out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + *x = s->img_x; + *y = s->img_y; + if (comp) *comp = s->img_n; + return out; +} +#endif + +// Targa Truevision - TGA +// by Jonathan Dummer +#ifndef STBI_NO_TGA +// returns STBI_rgb or whatever, 0 on error +static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) +{ + // only RGB or RGBA (incl. 16bit) or grey allowed + if(is_rgb16) *is_rgb16 = 0; + switch(bits_per_pixel) { + case 8: return STBI_grey; + case 16: if(is_grey) return STBI_grey_alpha; + // else: fall-through + case 15: if(is_rgb16) *is_rgb16 = 1; + return STBI_rgb; + case 24: // fall-through + case 32: return bits_per_pixel/8; + default: return 0; + } +} + +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) +{ + int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; + int sz, tga_colormap_type; + stbi__get8(s); // discard Offset + tga_colormap_type = stbi__get8(s); // colormap type + if( tga_colormap_type > 1 ) { + stbi__rewind(s); + return 0; // only RGB or indexed allowed + } + tga_image_type = stbi__get8(s); // image type + if ( tga_colormap_type == 1 ) { // colormapped (paletted) image + if (tga_image_type != 1 && tga_image_type != 9) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip image x and y origin + tga_colormap_bpp = sz; + } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE + if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { + stbi__rewind(s); + return 0; // only RGB or grey allowed, +/- RLE + } + stbi__skip(s,9); // skip colormap specification and image x/y origin + tga_colormap_bpp = 0; + } + tga_w = stbi__get16le(s); + if( tga_w < 1 ) { + stbi__rewind(s); + return 0; // test width + } + tga_h = stbi__get16le(s); + if( tga_h < 1 ) { + stbi__rewind(s); + return 0; // test height + } + tga_bits_per_pixel = stbi__get8(s); // bits per pixel + stbi__get8(s); // ignore alpha bits + if (tga_colormap_bpp != 0) { + if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { + // when using a colormap, tga_bits_per_pixel is the size of the indexes + // I don't think anything but 8 or 16bit indexes makes sense + stbi__rewind(s); + return 0; + } + tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL); + } else { + tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); + } + if(!tga_comp) { + stbi__rewind(s); + return 0; + } + if (x) *x = tga_w; + if (y) *y = tga_h; + if (comp) *comp = tga_comp; + return 1; // seems to have passed everything +} + +static int stbi__tga_test(stbi__context *s) +{ + int res = 0; + int sz, tga_color_type; + stbi__get8(s); // discard Offset + tga_color_type = stbi__get8(s); // color type + if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed + sz = stbi__get8(s); // image type + if ( tga_color_type == 1 ) { // colormapped (paletted) image + if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + stbi__skip(s,4); // skip image x and y origin + } else { // "normal" image w/o colormap + if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE + stbi__skip(s,9); // skip colormap specification and image x/y origin + } + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height + sz = stbi__get8(s); // bits per pixel + if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + + res = 1; // if we got this far, everything's good and we can return 1 instead of 0 + +errorEnd: + stbi__rewind(s); + return res; +} + +// read 16bit value and convert to 24bit RGB +static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out) +{ + stbi__uint16 px = (stbi__uint16)stbi__get16le(s); + stbi__uint16 fiveBitMask = 31; + // we have 3 channels with 5bits each + int r = (px >> 10) & fiveBitMask; + int g = (px >> 5) & fiveBitMask; + int b = px & fiveBitMask; + // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later + out[0] = (stbi_uc)((r * 255)/31); + out[1] = (stbi_uc)((g * 255)/31); + out[2] = (stbi_uc)((b * 255)/31); + + // some people claim that the most significant bit might be used for alpha + // (possibly if an alpha-bit is set in the "image descriptor byte") + // but that only made 16bit test images completely translucent.. + // so let's treat all 15 and 16bit TGAs as RGB with no alpha. +} + +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + // read in the TGA header stuff + int tga_offset = stbi__get8(s); + int tga_indexed = stbi__get8(s); + int tga_image_type = stbi__get8(s); + int tga_is_RLE = 0; + int tga_palette_start = stbi__get16le(s); + int tga_palette_len = stbi__get16le(s); + int tga_palette_bits = stbi__get8(s); + int tga_x_origin = stbi__get16le(s); + int tga_y_origin = stbi__get16le(s); + int tga_width = stbi__get16le(s); + int tga_height = stbi__get16le(s); + int tga_bits_per_pixel = stbi__get8(s); + int tga_comp, tga_rgb16=0; + int tga_inverted = stbi__get8(s); + // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) + // image data + unsigned char *tga_data; + unsigned char *tga_palette = NULL; + int i, j; + unsigned char raw_data[4]; + int RLE_count = 0; + int RLE_repeating = 0; + int read_next_pixel = 1; + STBI_NOTUSED(ri); + + // do a tiny bit of precessing + if ( tga_image_type >= 8 ) + { + tga_image_type -= 8; + tga_is_RLE = 1; + } + tga_inverted = 1 - ((tga_inverted >> 5) & 1); + + // If I'm paletted, then I'll use the number of bits from the palette + if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); + else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); + + if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency + return stbi__errpuc("bad format", "Can't find out TGA pixelformat"); + + // tga info + *x = tga_width; + *y = tga_height; + if (comp) *comp = tga_comp; + + if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0)) + return stbi__errpuc("too large", "Corrupt TGA"); + + tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0); + if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); + + // skip to the data's starting position (offset usually = 0) + stbi__skip(s, tga_offset ); + + if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { + for (i=0; i < tga_height; ++i) { + int row = tga_inverted ? tga_height -i - 1 : i; + stbi_uc *tga_row = tga_data + row*tga_width*tga_comp; + stbi__getn(s, tga_row, tga_width * tga_comp); + } + } else { + // do I need to load a palette? + if ( tga_indexed) + { + // any data to skip? (offset usually = 0) + stbi__skip(s, tga_palette_start ); + // load the palette + tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0); + if (!tga_palette) { + STBI_FREE(tga_data); + return stbi__errpuc("outofmem", "Out of memory"); + } + if (tga_rgb16) { + stbi_uc *pal_entry = tga_palette; + STBI_ASSERT(tga_comp == STBI_rgb); + for (i=0; i < tga_palette_len; ++i) { + stbi__tga_read_rgb16(s, pal_entry); + pal_entry += tga_comp; + } + } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { + STBI_FREE(tga_data); + STBI_FREE(tga_palette); + return stbi__errpuc("bad palette", "Corrupt TGA"); + } + } + // load the data + for (i=0; i < tga_width * tga_height; ++i) + { + // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? + if ( tga_is_RLE ) + { + if ( RLE_count == 0 ) + { + // yep, get the next byte as a RLE command + int RLE_cmd = stbi__get8(s); + RLE_count = 1 + (RLE_cmd & 127); + RLE_repeating = RLE_cmd >> 7; + read_next_pixel = 1; + } else if ( !RLE_repeating ) + { + read_next_pixel = 1; + } + } else + { + read_next_pixel = 1; + } + // OK, if I need to read a pixel, do it now + if ( read_next_pixel ) + { + // load however much data we did have + if ( tga_indexed ) + { + // read in index, then perform the lookup + int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s); + if ( pal_idx >= tga_palette_len ) { + // invalid index + pal_idx = 0; + } + pal_idx *= tga_comp; + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = tga_palette[pal_idx+j]; + } + } else if(tga_rgb16) { + STBI_ASSERT(tga_comp == STBI_rgb); + stbi__tga_read_rgb16(s, raw_data); + } else { + // read in the data raw + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = stbi__get8(s); + } + } + // clear the reading flag for the next pixel + read_next_pixel = 0; + } // end of reading a pixel + + // copy data + for (j = 0; j < tga_comp; ++j) + tga_data[i*tga_comp+j] = raw_data[j]; + + // in case we're in RLE mode, keep counting down + --RLE_count; + } + // do I need to invert the image? + if ( tga_inverted ) + { + for (j = 0; j*2 < tga_height; ++j) + { + int index1 = j * tga_width * tga_comp; + int index2 = (tga_height - 1 - j) * tga_width * tga_comp; + for (i = tga_width * tga_comp; i > 0; --i) + { + unsigned char temp = tga_data[index1]; + tga_data[index1] = tga_data[index2]; + tga_data[index2] = temp; + ++index1; + ++index2; + } + } + } + // clear my palette, if I had one + if ( tga_palette != NULL ) + { + STBI_FREE( tga_palette ); + } + } + + // swap RGB - if the source data was RGB16, it already is in the right order + if (tga_comp >= 3 && !tga_rgb16) + { + unsigned char* tga_pixel = tga_data; + for (i=0; i < tga_width * tga_height; ++i) + { + unsigned char temp = tga_pixel[0]; + tga_pixel[0] = tga_pixel[2]; + tga_pixel[2] = temp; + tga_pixel += tga_comp; + } + } + + // convert to target component count + if (req_comp && req_comp != tga_comp) + tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); + + // the things I do to get rid of an error message, and yet keep + // Microsoft's C compilers happy... [8^( + tga_palette_start = tga_palette_len = tga_palette_bits = + tga_x_origin = tga_y_origin = 0; + // OK, done + return tga_data; +} +#endif + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s) +{ + int r = (stbi__get32be(s) == 0x38425053); + stbi__rewind(s); + return r; +} + +static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount) +{ + int count, nleft, len; + + count = 0; + while ((nleft = pixelCount - count) > 0) { + len = stbi__get8(s); + if (len == 128) { + // No-op. + } else if (len < 128) { + // Copy next len+1 bytes literally. + len++; + if (len > nleft) return 0; // corrupt data + count += len; + while (len) { + *p = stbi__get8(s); + p += 4; + len--; + } + } else if (len > 128) { + stbi_uc val; + // Next -len+1 bytes in the dest are replicated from next source byte. + // (Interpret len as a negative 8-bit int.) + len = 257 - len; + if (len > nleft) return 0; // corrupt data + val = stbi__get8(s); + count += len; + while (len) { + *p = val; + p += 4; + len--; + } + } + } + + return 1; +} + +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + int pixelCount; + int channelCount, compression; + int channel, i; + int bitdepth; + int w,h; + stbi_uc *out; + STBI_NOTUSED(ri); + + // Check identifier + if (stbi__get32be(s) != 0x38425053) // "8BPS" + return stbi__errpuc("not PSD", "Corrupt PSD image"); + + // Check file type version. + if (stbi__get16be(s) != 1) + return stbi__errpuc("wrong version", "Unsupported version of PSD image"); + + // Skip 6 reserved bytes. + stbi__skip(s, 6 ); + + // Read the number of channels (R, G, B, A, etc). + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) + return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); + + // Read the rows and columns of the image. + h = stbi__get32be(s); + w = stbi__get32be(s); + + // Make sure the depth is 8 bits. + bitdepth = stbi__get16be(s); + if (bitdepth != 8 && bitdepth != 16) + return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); + + // Make sure the color mode is RGB. + // Valid options are: + // 0: Bitmap + // 1: Grayscale + // 2: Indexed color + // 3: RGB color + // 4: CMYK color + // 7: Multichannel + // 8: Duotone + // 9: Lab color + if (stbi__get16be(s) != 3) + return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); + + // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) + stbi__skip(s,stbi__get32be(s) ); + + // Skip the image resources. (resolution, pen tool paths, etc) + stbi__skip(s, stbi__get32be(s) ); + + // Skip the reserved data. + stbi__skip(s, stbi__get32be(s) ); + + // Find out if the data is compressed. + // Known values: + // 0: no compression + // 1: RLE compressed + compression = stbi__get16be(s); + if (compression > 1) + return stbi__errpuc("bad compression", "PSD has an unknown compression format"); + + // Check size + if (!stbi__mad3sizes_valid(4, w, h, 0)) + return stbi__errpuc("too large", "Corrupt PSD"); + + // Create the destination image. + + if (!compression && bitdepth == 16 && bpc == 16) { + out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0); + ri->bits_per_channel = 16; + } else + out = (stbi_uc *) stbi__malloc(4 * w*h); + + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + pixelCount = w*h; + + // Initialize the data to zero. + //memset( out, 0, pixelCount * 4 ); + + // Finally, the image data. + if (compression) { + // RLE as used by .PSD and .TIFF + // Loop until you get the number of unpacked bytes you are expecting: + // Read the next source byte into n. + // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. + // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. + // Else if n is 128, noop. + // Endloop + + // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, + // which we're going to just skip. + stbi__skip(s, h * channelCount * 2 ); + + // Read the RLE data by channel. + for (channel = 0; channel < 4; channel++) { + stbi_uc *p; + + p = out+channel; + if (channel >= channelCount) { + // Fill this channel with default data. + for (i = 0; i < pixelCount; i++, p += 4) + *p = (channel == 3 ? 255 : 0); + } else { + // Read the RLE data. + if (!stbi__psd_decode_rle(s, p, pixelCount)) { + STBI_FREE(out); + return stbi__errpuc("corrupt", "bad RLE data"); + } + } + } + + } else { + // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) + // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. + + // Read the data by channel. + for (channel = 0; channel < 4; channel++) { + if (channel >= channelCount) { + // Fill this channel with default data. + if (bitdepth == 16 && bpc == 16) { + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + stbi_us val = channel == 3 ? 65535 : 0; + for (i = 0; i < pixelCount; i++, q += 4) + *q = val; + } else { + stbi_uc *p = out+channel; + stbi_uc val = channel == 3 ? 255 : 0; + for (i = 0; i < pixelCount; i++, p += 4) + *p = val; + } + } else { + if (ri->bits_per_channel == 16) { // output bpc + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + for (i = 0; i < pixelCount; i++, q += 4) + *q = (stbi__uint16) stbi__get16be(s); + } else { + stbi_uc *p = out+channel; + if (bitdepth == 16) { // input bpc + for (i = 0; i < pixelCount; i++, p += 4) + *p = (stbi_uc) (stbi__get16be(s) >> 8); + } else { + for (i = 0; i < pixelCount; i++, p += 4) + *p = stbi__get8(s); + } + } + } + } + } + + // remove weird white matte from PSD + if (channelCount >= 4) { + if (ri->bits_per_channel == 16) { + for (i=0; i < w*h; ++i) { + stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i; + if (pixel[3] != 0 && pixel[3] != 65535) { + float a = pixel[3] / 65535.0f; + float ra = 1.0f / a; + float inv_a = 65535.0f * (1 - ra); + pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a); + pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a); + pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a); + } + } + } else { + for (i=0; i < w*h; ++i) { + unsigned char *pixel = out + 4*i; + if (pixel[3] != 0 && pixel[3] != 255) { + float a = pixel[3] / 255.0f; + float ra = 1.0f / a; + float inv_a = 255.0f * (1 - ra); + pixel[0] = (unsigned char) (pixel[0]*ra + inv_a); + pixel[1] = (unsigned char) (pixel[1]*ra + inv_a); + pixel[2] = (unsigned char) (pixel[2]*ra + inv_a); + } + } + } + } + + // convert to desired output format + if (req_comp && req_comp != 4) { + if (ri->bits_per_channel == 16) + out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h); + else + out = stbi__convert_format(out, 4, req_comp, w, h); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + if (comp) *comp = 4; + *y = h; + *x = w; + + return out; } #endif +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon // +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +#ifndef STBI_NO_PIC +static int stbi__pic_is4(stbi__context *s,const char *str) +{ + int i; + for (i=0; i<4; ++i) + if (stbi__get8(s) != (stbi_uc)str[i]) + return 0; + + return 1; +} + +static int stbi__pic_test_core(stbi__context *s) +{ + int i; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) + return 0; + + for(i=0;i<84;++i) + stbi__get8(s); + + if (!stbi__pic_is4(s,"PICT")) + return 0; + + return 1; +} + +typedef struct +{ + stbi_uc size,type,channel; +} stbi__pic_packet; + +static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) +{ + int mask=0x80, i; + + for (i=0; i<4; ++i, mask>>=1) { + if (channel & mask) { + if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); + dest[i]=stbi__get8(s); + } + } + + return dest; +} + +static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src) +{ + int mask=0x80,i; + + for (i=0;i<4; ++i, mask>>=1) + if (channel&mask) + dest[i]=src[i]; +} + +static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result) +{ + int act_comp=0,num_packets=0,y,chained; + stbi__pic_packet packets[10]; + + // this will (should...) cater for even some bizarre stuff like having data + // for the same channel in multiple packets. + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return stbi__errpuc("bad format","too many packets"); + + packet = &packets[num_packets++]; + + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + + act_comp |= packet->channel; + + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); + if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? + + for(y=0; y<height; ++y) { + int packet_idx; + + for(packet_idx=0; packet_idx < num_packets; ++packet_idx) { + stbi__pic_packet *packet = &packets[packet_idx]; + stbi_uc *dest = result+y*width*4; + + switch (packet->type) { + default: + return stbi__errpuc("bad format","packet has bad compression type"); + + case 0: {//uncompressed + int x; + + for(x=0;x<width;++x, dest+=4) + if (!stbi__readval(s,packet->channel,dest)) + return 0; + break; + } + + case 1://Pure RLE + { + int left=width, i; + + while (left>0) { + stbi_uc count,value[4]; + + count=stbi__get8(s); + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); + + if (count > left) + count = (stbi_uc) left; + + if (!stbi__readval(s,packet->channel,value)) return 0; + + for(i=0; i<count; ++i,dest+=4) + stbi__copyval(packet->channel,dest,value); + left -= count; + } + } + break; + + case 2: {//Mixed RLE + int left=width; + while (left>0) { + int count = stbi__get8(s), i; + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); + + if (count >= 128) { // Repeated + stbi_uc value[4]; + + if (count==128) + count = stbi__get16be(s); + else + count -= 127; + if (count > left) + return stbi__errpuc("bad file","scanline overrun"); + + if (!stbi__readval(s,packet->channel,value)) + return 0; + + for(i=0;i<count;++i, dest += 4) + stbi__copyval(packet->channel,dest,value); + } else { // Raw + ++count; + if (count>left) return stbi__errpuc("bad file","scanline overrun"); + + for(i=0;i<count;++i, dest+=4) + if (!stbi__readval(s,packet->channel,dest)) + return 0; + } + left-=count; + } + break; + } + } + } + } + + return result; +} + +static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) +{ + stbi_uc *result; + int i, x,y; + STBI_NOTUSED(ri); + + for (i=0; i<92; ++i) + stbi__get8(s); + + x = stbi__get16be(s); + y = stbi__get16be(s); + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); + if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode"); + + stbi__get32be(s); //skip `ratio' + stbi__get16be(s); //skip `fields' + stbi__get16be(s); //skip `pad' + + // intermediate buffer is RGBA + result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0); + memset(result, 0xff, x*y*4); + + if (!stbi__pic_load_core(s,x,y,comp, result)) { + STBI_FREE(result); + result=0; + } + *px = x; + *py = y; + if (req_comp == 0) req_comp = *comp; + result=stbi__convert_format(result,4,req_comp,x,y); + + return result; +} + +static int stbi__pic_test(stbi__context *s) +{ + int r = stbi__pic_test_core(s); + stbi__rewind(s); + return r; +} +#endif + +// ************************************************************************************************* +// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb + +#ifndef STBI_NO_GIF +typedef struct +{ + stbi__int16 prefix; + stbi_uc first; + stbi_uc suffix; +} stbi__gif_lzw; + +typedef struct +{ + int w,h; + stbi_uc *out, *old_out; // output buffer (always 4 components) + int flags, bgindex, ratio, transparent, eflags, delay; + stbi_uc pal[256][4]; + stbi_uc lpal[256][4]; + stbi__gif_lzw codes[4096]; + stbi_uc *color_table; + int parse, step; + int lflags; + int start_x, start_y; + int max_x, max_y; + int cur_x, cur_y; + int line_size; +} stbi__gif; + +static int stbi__gif_test_raw(stbi__context *s) +{ + int sz; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; + sz = stbi__get8(s); + if (sz != '9' && sz != '7') return 0; + if (stbi__get8(s) != 'a') return 0; + return 1; +} + +static int stbi__gif_test(stbi__context *s) +{ + int r = stbi__gif_test_raw(s); + stbi__rewind(s); + return r; +} + +static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp) +{ + int i; + for (i=0; i < num_entries; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + pal[i][3] = transp == i ? 0 : 255; + } +} + +static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) +{ + stbi_uc version; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') + return stbi__err("not GIF", "Corrupt GIF"); + + version = stbi__get8(s); + if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); + if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); + + stbi__g_failure_reason = ""; + g->w = stbi__get16le(s); + g->h = stbi__get16le(s); + g->flags = stbi__get8(s); + g->bgindex = stbi__get8(s); + g->ratio = stbi__get8(s); + g->transparent = -1; + + if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments + + if (is_info) return 1; + + if (g->flags & 0x80) + stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); + + return 1; +} + +static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif)); + if (!stbi__gif_header(s, g, comp, 1)) { + STBI_FREE(g); + stbi__rewind( s ); + return 0; + } + if (x) *x = g->w; + if (y) *y = g->h; + STBI_FREE(g); + return 1; +} + +static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) +{ + stbi_uc *p, *c; + + // recurse to decode the prefixes, since the linked-list is backwards, + // and working backwards through an interleaved image would be nasty + if (g->codes[code].prefix >= 0) + stbi__out_gif_code(g, g->codes[code].prefix); + + if (g->cur_y >= g->max_y) return; + + p = &g->out[g->cur_x + g->cur_y]; + c = &g->color_table[g->codes[code].suffix * 4]; + + if (c[3] >= 128) { + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } + g->cur_x += 4; + + if (g->cur_x >= g->max_x) { + g->cur_x = g->start_x; + g->cur_y += g->step; + + while (g->cur_y >= g->max_y && g->parse > 0) { + g->step = (1 << g->parse) * g->line_size; + g->cur_y = g->start_y + (g->step >> 1); + --g->parse; + } + } +} + +static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) +{ + stbi_uc lzw_cs; + stbi__int32 len, init_code; + stbi__uint32 first; + stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; + stbi__gif_lzw *p; + + lzw_cs = stbi__get8(s); + if (lzw_cs > 12) return NULL; + clear = 1 << lzw_cs; + first = 1; + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + bits = 0; + valid_bits = 0; + for (init_code = 0; init_code < clear; init_code++) { + g->codes[init_code].prefix = -1; + g->codes[init_code].first = (stbi_uc) init_code; + g->codes[init_code].suffix = (stbi_uc) init_code; + } + + // support no starting clear code + avail = clear+2; + oldcode = -1; + + len = 0; + for(;;) { + if (valid_bits < codesize) { + if (len == 0) { + len = stbi__get8(s); // start new block + if (len == 0) + return g->out; + } + --len; + bits |= (stbi__int32) stbi__get8(s) << valid_bits; + valid_bits += 8; + } else { + stbi__int32 code = bits & codemask; + bits >>= codesize; + valid_bits -= codesize; + // @OPTIMIZE: is there some way we can accelerate the non-clear path? + if (code == clear) { // clear code + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + avail = clear + 2; + oldcode = -1; + first = 0; + } else if (code == clear + 1) { // end of stream code + stbi__skip(s, len); + while ((len = stbi__get8(s)) > 0) + stbi__skip(s,len); + return g->out; + } else if (code <= avail) { + if (first) return stbi__errpuc("no clear code", "Corrupt GIF"); + + if (oldcode >= 0) { + p = &g->codes[avail++]; + if (avail > 4096) return stbi__errpuc("too many codes", "Corrupt GIF"); + p->prefix = (stbi__int16) oldcode; + p->first = g->codes[oldcode].first; + p->suffix = (code == avail) ? p->first : g->codes[code].first; + } else if (code == avail) + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + + stbi__out_gif_code(g, (stbi__uint16) code); + + if ((avail & codemask) == 0 && avail <= 0x0FFF) { + codesize++; + codemask = (1 << codesize) - 1; + } + + oldcode = code; + } else { + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + } + } + } +} + +static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1) +{ + int x, y; + stbi_uc *c = g->pal[g->bgindex]; + for (y = y0; y < y1; y += 4 * g->w) { + for (x = x0; x < x1; x += 4) { + stbi_uc *p = &g->out[y + x]; + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = 0; + } + } +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp) +{ + int i; + stbi_uc *prev_out = 0; + + if (g->out == 0 && !stbi__gif_header(s, g, comp,0)) + return 0; // stbi__g_failure_reason set by stbi__gif_header + + if (!stbi__mad3sizes_valid(g->w, g->h, 4, 0)) + return stbi__errpuc("too large", "GIF too large"); + + prev_out = g->out; + g->out = (stbi_uc *) stbi__malloc_mad3(4, g->w, g->h, 0); + if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory"); + + switch ((g->eflags & 0x1C) >> 2) { + case 0: // unspecified (also always used on 1st frame) + stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h); + break; + case 1: // do not dispose + if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); + g->old_out = prev_out; + break; + case 2: // dispose to background + if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); + stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y); + break; + case 3: // dispose to previous + if (g->old_out) { + for (i = g->start_y; i < g->max_y; i += 4 * g->w) + memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x); + } + break; + } + + for (;;) { + switch (stbi__get8(s)) { + case 0x2C: /* Image Descriptor */ + { + int prev_trans = -1; + stbi__int32 x, y, w, h; + stbi_uc *o; + + x = stbi__get16le(s); + y = stbi__get16le(s); + w = stbi__get16le(s); + h = stbi__get16le(s); + if (((x + w) > (g->w)) || ((y + h) > (g->h))) + return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); + + g->line_size = g->w * 4; + g->start_x = x * 4; + g->start_y = y * g->line_size; + g->max_x = g->start_x + w * 4; + g->max_y = g->start_y + h * g->line_size; + g->cur_x = g->start_x; + g->cur_y = g->start_y; + + g->lflags = stbi__get8(s); + + if (g->lflags & 0x40) { + g->step = 8 * g->line_size; // first interlaced spacing + g->parse = 3; + } else { + g->step = g->line_size; + g->parse = 0; + } + + if (g->lflags & 0x80) { + stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); + g->color_table = (stbi_uc *) g->lpal; + } else if (g->flags & 0x80) { + if (g->transparent >= 0 && (g->eflags & 0x01)) { + prev_trans = g->pal[g->transparent][3]; + g->pal[g->transparent][3] = 0; + } + g->color_table = (stbi_uc *) g->pal; + } else + return stbi__errpuc("missing color table", "Corrupt GIF"); + + o = stbi__process_gif_raster(s, g); + if (o == NULL) return NULL; + + if (prev_trans != -1) + g->pal[g->transparent][3] = (stbi_uc) prev_trans; + + return o; + } + + case 0x21: // Comment Extension. + { + int len; + if (stbi__get8(s) == 0xF9) { // Graphic Control Extension. + len = stbi__get8(s); + if (len == 4) { + g->eflags = stbi__get8(s); + g->delay = stbi__get16le(s); + g->transparent = stbi__get8(s); + } else { + stbi__skip(s, len); + break; + } + } + while ((len = stbi__get8(s)) != 0) + stbi__skip(s, len); + break; + } + + case 0x3B: // gif stream termination code + return (stbi_uc *) s; // using '1' causes warning on some compilers + + default: + return stbi__errpuc("unknown code", "Corrupt GIF"); + } + } + + STBI_NOTUSED(req_comp); +} + +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *u = 0; + stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif)); + memset(g, 0, sizeof(*g)); + STBI_NOTUSED(ri); + + u = stbi__gif_load_next(s, g, comp, req_comp); + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + if (u) { + *x = g->w; + *y = g->h; + if (req_comp && req_comp != 4) + u = stbi__convert_format(u, 4, req_comp, g->w, g->h); + } + else if (g->out) + STBI_FREE(g->out); + STBI_FREE(g); + return u; +} + +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) +{ + return stbi__gif_info_raw(s,x,y,comp); +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int stbi__hdr_test_core(stbi__context *s, const char *signature) +{ + int i; + for (i=0; signature[i]; ++i) + if (stbi__get8(s) != signature[i]) + return 0; + stbi__rewind(s); + return 1; +} + +static int stbi__hdr_test(stbi__context* s) +{ + int r = stbi__hdr_test_core(s, "#?RADIANCE\n"); + stbi__rewind(s); + if(!r) { + r = stbi__hdr_test_core(s, "#?RGBE\n"); + stbi__rewind(s); + } + return r; +} + +#define STBI__HDR_BUFLEN 1024 +static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) +{ + int len=0; + char c = '\0'; + + c = (char) stbi__get8(z); + + while (!stbi__at_eof(z) && c != '\n') { + buffer[len++] = c; + if (len == STBI__HDR_BUFLEN-1) { + // flush to end of line + while (!stbi__at_eof(z) && stbi__get8(z) != '\n') + ; + break; + } + c = (char) stbi__get8(z); + } + + buffer[len] = 0; + return buffer; +} + +static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) +{ + if ( input[3] != 0 ) { + float f1; + // Exponent + f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); + if (req_comp <= 2) + output[0] = (input[0] + input[1] + input[2]) * f1 / 3; + else { + output[0] = input[0] * f1; + output[1] = input[1] * f1; + output[2] = input[2] * f1; + } + if (req_comp == 2) output[1] = 1; + if (req_comp == 4) output[3] = 1; + } else { + switch (req_comp) { + case 4: output[3] = 1; /* fallthrough */ + case 3: output[0] = output[1] = output[2] = 0; + break; + case 2: output[1] = 1; /* fallthrough */ + case 1: output[0] = 0; + break; + } + } +} + +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + int width, height; + stbi_uc *scanline; + float *hdr_data; + int len; + unsigned char count, value; + int i, j, k, c1,c2, z; + const char *headerToken; + STBI_NOTUSED(ri); + + // Check identifier + headerToken = stbi__hdr_gettoken(s,buffer); + if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) + return stbi__errpf("not HDR", "Corrupt HDR image"); + + // Parse header + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); + + // Parse width and height + // can't use sscanf() if we're not using stdio! + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + height = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + width = (int) strtol(token, NULL, 10); + + *x = width; + *y = height; + + if (comp) *comp = 3; + if (req_comp == 0) req_comp = 3; + + if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0)) + return stbi__errpf("too large", "HDR image is too large"); + + // Read data + hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0); + if (!hdr_data) + return stbi__errpf("outofmem", "Out of memory"); + + // Load image data + // image data is stored as some number of sca + if ( width < 8 || width >= 32768) { + // Read flat data + for (j=0; j < height; ++j) { + for (i=0; i < width; ++i) { + stbi_uc rgbe[4]; + main_decode_loop: + stbi__getn(s, rgbe, 4); + stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); + } + } + } else { + // Read RLE-encoded data + scanline = NULL; + + for (j = 0; j < height; ++j) { + c1 = stbi__get8(s); + c2 = stbi__get8(s); + len = stbi__get8(s); + if (c1 != 2 || c2 != 2 || (len & 0x80)) { + // not run-length encoded, so we have to actually use THIS data as a decoded + // pixel (note this can't be a valid pixel--one of RGB must be >= 128) + stbi_uc rgbe[4]; + rgbe[0] = (stbi_uc) c1; + rgbe[1] = (stbi_uc) c2; + rgbe[2] = (stbi_uc) len; + rgbe[3] = (stbi_uc) stbi__get8(s); + stbi__hdr_convert(hdr_data, rgbe, req_comp); + i = 1; + j = 0; + STBI_FREE(scanline); + goto main_decode_loop; // yes, this makes no sense + } + len <<= 8; + len |= stbi__get8(s); + if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } + if (scanline == NULL) { + scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0); + if (!scanline) { + STBI_FREE(hdr_data); + return stbi__errpf("outofmem", "Out of memory"); + } + } + + for (k = 0; k < 4; ++k) { + int nleft; + i = 0; + while ((nleft = width - i) > 0) { + count = stbi__get8(s); + if (count > 128) { + // Run + value = stbi__get8(s); + count -= 128; + if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = value; + } else { + // Dump + if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = stbi__get8(s); + } + } + } + for (i=0; i < width; ++i) + stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); + } + if (scanline) + STBI_FREE(scanline); + } + + return hdr_data; +} + +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + + if (stbi__hdr_test(s) == 0) { + stbi__rewind( s ); + return 0; + } + + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) { + stbi__rewind( s ); + return 0; + } + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *y = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *x = (int) strtol(token, NULL, 10); + *comp = 3; + return 1; +} +#endif // STBI_NO_HDR + +#ifndef STBI_NO_BMP +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) +{ + void *p; + stbi__bmp_data info; + + info.all_a = 255; + p = stbi__bmp_parse_header(s, &info); + stbi__rewind( s ); + if (p == NULL) + return 0; + *x = s->img_x; + *y = s->img_y; + *comp = info.ma ? 4 : 3; + return 1; +} +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) +{ + int channelCount; + if (stbi__get32be(s) != 0x38425053) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 1) { + stbi__rewind( s ); + return 0; + } + stbi__skip(s, 6); + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) { + stbi__rewind( s ); + return 0; + } + *y = stbi__get32be(s); + *x = stbi__get32be(s); + if (stbi__get16be(s) != 8) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 3) { + stbi__rewind( s ); + return 0; + } + *comp = 4; + return 1; +} +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) +{ + int act_comp=0,num_packets=0,chained; + stbi__pic_packet packets[10]; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { + stbi__rewind(s); + return 0; + } + + stbi__skip(s, 88); + + *x = stbi__get16be(s); + *y = stbi__get16be(s); + if (stbi__at_eof(s)) { + stbi__rewind( s); + return 0; + } + if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { + stbi__rewind( s ); + return 0; + } + + stbi__skip(s, 8); + + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return 0; + + packet = &packets[num_packets++]; + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + act_comp |= packet->channel; + + if (stbi__at_eof(s)) { + stbi__rewind( s ); + return 0; + } + if (packet->size != 8) { + stbi__rewind( s ); + return 0; + } + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); + + return 1; +} +#endif + +// ************************************************************************************************* +// Portable Gray Map and Portable Pixel Map loader +// by Ken Miller // -//// end header file ///////////////////////////////////////////////////// -#endif // STBI_INCLUDE_STB_IMAGE_H +// PGM: http://netpbm.sourceforge.net/doc/pgm.html +// PPM: http://netpbm.sourceforge.net/doc/ppm.html +// +// Known limitations: +// Does not support comments in the header section +// Does not support ASCII image data (formats P2 and P3) +// Does not support 16-bit-per-channel + +#ifndef STBI_NO_PNM + +static int stbi__pnm_test(stbi__context *s) +{ + char p, t; + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind( s ); + return 0; + } + return 1; +} + +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + STBI_NOTUSED(ri); + + if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) + return 0; + + *x = s->img_x; + *y = s->img_y; + *comp = s->img_n; + + if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0)) + return stbi__errpuc("too large", "PNM too large"); + + out = (stbi_uc *) stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + stbi__getn(s, out, s->img_n * s->img_x * s->img_y); + + if (req_comp && req_comp != s->img_n) { + out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + return out; +} + +static int stbi__pnm_isspace(char c) +{ + return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; +} + +static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) +{ + for (;;) { + while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) + *c = (char) stbi__get8(s); + + if (stbi__at_eof(s) || *c != '#') + break; + + while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' ) + *c = (char) stbi__get8(s); + } +} + +static int stbi__pnm_isdigit(char c) +{ + return c >= '0' && c <= '9'; +} + +static int stbi__pnm_getinteger(stbi__context *s, char *c) +{ + int value = 0; + + while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { + value = value*10 + (*c - '0'); + *c = (char) stbi__get8(s); + } + + return value; +} + +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) +{ + int maxv; + char c, p, t; + + stbi__rewind( s ); + + // Get identifier + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind( s ); + return 0; + } + + *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm + + c = (char) stbi__get8(s); + stbi__pnm_skip_whitespace(s, &c); + + *x = stbi__pnm_getinteger(s, &c); // read width + stbi__pnm_skip_whitespace(s, &c); + + *y = stbi__pnm_getinteger(s, &c); // read height + stbi__pnm_skip_whitespace(s, &c); + + maxv = stbi__pnm_getinteger(s, &c); // read max value + + if (maxv > 255) + return stbi__err("max value > 255", "PPM image not 8-bit"); + else + return 1; +} +#endif + +static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) +{ + #ifndef STBI_NO_JPEG + if (stbi__jpeg_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNG + if (stbi__png_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_GIF + if (stbi__gif_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_BMP + if (stbi__bmp_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PSD + if (stbi__psd_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PIC + if (stbi__pic_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNM + if (stbi__pnm_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_info(s, x, y, comp)) return 1; + #endif + + // test tga last because it's a crappy test! + #ifndef STBI_NO_TGA + if (stbi__tga_info(s, x, y, comp)) + return 1; + #endif + return stbi__err("unknown image type", "Image not of any known type, or corrupt"); +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result; + if (!f) return stbi__err("can't fopen", "Unable to open file"); + result = stbi_info_from_file(f, x, y, comp); + fclose(f); + return result; +} + +STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) +{ + int r; + stbi__context s; + long pos = ftell(f); + stbi__start_file(&s, f); + r = stbi__info_main(&s,x,y,comp); + fseek(f,pos,SEEK_SET); + return r; +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi__info_main(&s,x,y,comp); +} + +#endif // STB_IMAGE_IMPLEMENTATION + +/* + revision history: + 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) allocate large structures on the stack + remove white matting for transparent PSD + fix reported channel count for PNG & BMP + re-enable SSE2 in non-gcc 64-bit + support RGB-formatted JPEG + read 16-bit PNGs (only as 8-bit) + 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED + 2.09 (2016-01-16) allow comments in PNM files + 16-bit-per-pixel TGA (not bit-per-component) + info() for TGA could break due to .hdr handling + info() for BMP to shares code instead of sloppy parse + can use STBI_REALLOC_SIZED if allocator doesn't support realloc + code cleanup + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA + 2.07 (2015-09-13) fix compiler warnings + partial animated GIF support + limited 16-bpc PSD support + #ifdef unused functions + bug with < 92 byte PIC,PNM,HDR,TGA + 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value + 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning + 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit + 2.03 (2015-04-12) extra corruption checking (mmozeiko) + stbi_set_flip_vertically_on_load (nguillemot) + fix NEON support; fix mingw support + 2.02 (2015-01-19) fix incorrect assert, fix warning + 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 + 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG + 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) + progressive JPEG (stb) + PGM/PPM support (Ken Miller) + STBI_MALLOC,STBI_REALLOC,STBI_FREE + GIF bugfix -- seemingly never worked + STBI_NO_*, STBI_ONLY_* + 1.48 (2014-12-14) fix incorrectly-named assert() + 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) + optimize PNG (ryg) + fix bug in interlaced PNG with user-specified channel count (stb) + 1.46 (2014-08-26) + fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG + 1.45 (2014-08-16) + fix MSVC-ARM internal compiler error by wrapping malloc + 1.44 (2014-08-07) + various warning fixes from Ronny Chevalier + 1.43 (2014-07-15) + fix MSVC-only compiler problem in code changed in 1.42 + 1.42 (2014-07-09) + don't define _CRT_SECURE_NO_WARNINGS (affects user code) + fixes to stbi__cleanup_jpeg path + added STBI_ASSERT to avoid requiring assert.h + 1.41 (2014-06-25) + fix search&replace from 1.36 that messed up comments/error messages + 1.40 (2014-06-22) + fix gcc struct-initialization warning + 1.39 (2014-06-15) + fix to TGA optimization when req_comp != number of components in TGA; + fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) + add support for BMP version 5 (more ignored fields) + 1.38 (2014-06-06) + suppress MSVC warnings on integer casts truncating values + fix accidental rename of 'skip' field of I/O + 1.37 (2014-06-04) + remove duplicate typedef + 1.36 (2014-06-03) + convert to header file single-file library + if de-iphone isn't set, load iphone images color-swapped instead of returning NULL + 1.35 (2014-05-27) + various warnings + fix broken STBI_SIMD path + fix bug where stbi_load_from_file no longer left file pointer in correct place + fix broken non-easy path for 32-bit BMP (possibly never used) + TGA optimization by Arseny Kapoulkine + 1.34 (unknown) + use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case + 1.33 (2011-07-14) + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements + 1.32 (2011-07-13) + support for "info" function for all supported filetypes (SpartanJ) + 1.31 (2011-06-20) + a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) + removed deprecated format-specific test/load functions + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) + fix inefficiency in decoding 32-bit BMP (David Woo) + 1.29 (2010-08-16) + various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) + fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) + cast-to-stbi_uc to fix warnings + 1.26 (2010-07-24) + fix bug in file buffering for PNG reported by SpartanJ + 1.25 (2010-07-17) + refix trans_data warning (Won Chun) + 1.24 (2010-07-12) + perf improvements reading from files on platforms with lock-heavy fgetc() + minor perf improvements for jpeg + deprecated type-specific functions so we'll get feedback if they're needed + attempt to fix trans_data warning (Won Chun) + 1.23 fixed bug in iPhone support + 1.22 (2010-07-10) + removed image *writing* support + stbi_info support from Jetro Lauha + GIF support from Jean-Marc Lienher + iPhone PNG-extensions from James Brown + warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) + 1.21 fix use of 'stbi_uc' in header (reported by jon blow) + 1.20 added support for Softimage PIC, by Tom Seddon + 1.19 bug in interlaced PNG corruption check (found by ryg) + 1.18 (2008-08-02) + fix a threading bug (local mutable static) + 1.17 support interlaced PNG + 1.16 major bugfix - stbi__convert_format converted one too many pixels + 1.15 initialize some fields for thread safety + 1.14 fix threadsafe conversion bug + header-file-only version (#define STBI_HEADER_FILE_ONLY before including) + 1.13 threadsafe + 1.12 const qualifiers in the API + 1.11 Support installable IDCT, colorspace conversion routines + 1.10 Fixes for 64-bit (don't use "unsigned long") + optimized upsampling by Fabian "ryg" Giesen + 1.09 Fix format-conversion for PSD code (bad global variables!) + 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz + 1.07 attempt to fix C++ warning/errors again + 1.06 attempt to fix C++ warning/errors again + 1.05 fix TGA loading to return correct *comp and use good luminance calc + 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free + 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR + 1.02 support for (subset of) HDR files, float interface for preferred access to them + 1.01 fix bug: possible bug in handling right-side up bmps... not sure + fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all + 1.00 interface to zlib that skips zlib header + 0.99 correct handling of alpha in palette + 0.98 TGA loader by lonesock; dynamically add loaders (untested) + 0.97 jpeg errors on too large a file; also catch another malloc failure + 0.96 fix detection of invalid v value - particleman@mollyrocket forum + 0.95 during header scan, seek to markers in case of padding + 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same + 0.93 handle jpegtran output; verbose errors + 0.92 read 4,8,16,24,32-bit BMP files of several formats + 0.91 output 24-bit Windows 3.0 BMP files + 0.90 fix a few more warnings; bump version number to approach 1.0 + 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd + 0.60 fix compiling as c++ + 0.59 fix warnings: merge Dave Moore's -Wall fixes + 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian + 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available + 0.56 fix bug: zlib uncompressed mode len vs. nlen + 0.55 fix bug: restart_interval not initialized to 0 + 0.54 allow NULL for 'int *comp' + 0.53 fix bug in png 3->4; speedup png decoding + 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments + 0.51 obey req_comp requests, 1-component jpegs return as 1-component, + on 'test' only check type, not whether we support this variant + 0.50 (2006-11-19) + first released version +*/ diff --git a/3party/stb_image/stb_image.pro b/3party/stb_image/stb_image.pro new file mode 100644 index 0000000000..9b7357253a --- /dev/null +++ b/3party/stb_image/stb_image.pro @@ -0,0 +1,12 @@ +TARGET = stb_image +ROOT_DIR = ../.. +include($$ROOT_DIR/common.pri) + +TEMPLATE = lib +CONFIG += staticlib + +SOURCES += \ + stb_image.cpp \ + +HEADERS += \ + stb_image.h \ diff --git a/3party/stb_image/stb_image_write.h b/3party/stb_image/stb_image_write.h new file mode 100755 index 0000000000..4319c0de1d --- /dev/null +++ b/3party/stb_image/stb_image_write.h @@ -0,0 +1,1048 @@ +/* stb_image_write - v1.02 - public domain - http://nothings.org/stb/stb_image_write.h + writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010-2015 + no warranty implied; use at your own risk + + Before #including, + + #define STB_IMAGE_WRITE_IMPLEMENTATION + + in the file that you want to have the implementation. + + Will probably not work correctly with strict-aliasing optimizations. + +ABOUT: + + This header file is a library for writing images to C stdio. It could be + adapted to write to memory or a general streaming interface; let me know. + + The PNG output is not optimal; it is 20-50% larger than the file + written by a decent optimizing implementation. This library is designed + for source code compactness and simplicity, not optimal image file size + or run-time performance. + +BUILDING: + + You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. + You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace + malloc,realloc,free. + You can define STBIW_MEMMOVE() to replace memmove() + +USAGE: + + There are four functions, one for each image file format: + + int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); + int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); + int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); + int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); + + There are also four equivalent functions that use an arbitrary write function. You are + expected to open/close your file-equivalent before and after calling these: + + int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); + int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); + int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); + int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); + + where the callback is: + void stbi_write_func(void *context, void *data, int size); + + You can define STBI_WRITE_NO_STDIO to disable the file variant of these + functions, so the library will not use stdio.h at all. However, this will + also disable HDR writing, because it requires stdio for formatted output. + + Each function returns 0 on failure and non-0 on success. + + The functions create an image file defined by the parameters. The image + is a rectangle of pixels stored from left-to-right, top-to-bottom. + Each pixel contains 'comp' channels of data stored interleaved with 8-bits + per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is + monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. + The *data pointer points to the first byte of the top-left-most pixel. + For PNG, "stride_in_bytes" is the distance in bytes from the first byte of + a row of pixels to the first byte of the next row of pixels. + + PNG creates output files with the same number of components as the input. + The BMP format expands Y to RGB in the file format and does not + output alpha. + + PNG supports writing rectangles of data even when the bytes storing rows of + data are not consecutive in memory (e.g. sub-rectangles of a larger image), + by supplying the stride between the beginning of adjacent rows. The other + formats do not. (Thus you cannot write a native-format BMP through the BMP + writer, both because it is in BGR order and because it may have padding + at the end of the line.) + + HDR expects linear float data. Since the format is always 32-bit rgb(e) + data, alpha (if provided) is discarded, and for monochrome data it is + replicated across all three channels. + + TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed + data, set the global variable 'stbi_write_tga_with_rle' to 0. + +CREDITS: + + PNG/BMP/TGA + Sean Barrett + HDR + Baldur Karlsson + TGA monochrome: + Jean-Sebastien Guay + misc enhancements: + Tim Kelsey + TGA RLE + Alan Hickman + initial file IO callback implementation + Emmanuel Julien + bugfixes: + github:Chribba + Guillaume Chereau + github:jry2 + github:romigrou + Sergio Gonzalez + Jonas Karlsson + Filip Wasil + Thatcher Ulrich + +LICENSE + +This software is dual-licensed to the public domain and under the following +license: you are granted a perpetual, irrevocable license to copy, modify, +publish, and distribute this file as you see fit. + +*/ + +#ifndef INCLUDE_STB_IMAGE_WRITE_H +#define INCLUDE_STB_IMAGE_WRITE_H + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef STB_IMAGE_WRITE_STATIC +#define STBIWDEF static +#else +#define STBIWDEF extern +extern int stbi_write_tga_with_rle; +#endif + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); +STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); +#endif + +typedef void stbi_write_func(void *context, void *data, int size); + +STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); +STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); + +#ifdef __cplusplus +} +#endif + +#endif//INCLUDE_STB_IMAGE_WRITE_H + +#ifdef STB_IMAGE_WRITE_IMPLEMENTATION + +#ifdef _WIN32 + #ifndef _CRT_SECURE_NO_WARNINGS + #define _CRT_SECURE_NO_WARNINGS + #endif + #ifndef _CRT_NONSTDC_NO_DEPRECATE + #define _CRT_NONSTDC_NO_DEPRECATE + #endif +#endif + +#ifndef STBI_WRITE_NO_STDIO +#include <stdio.h> +#endif // STBI_WRITE_NO_STDIO + +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> + +#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) +// ok +#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." +#endif + +#ifndef STBIW_MALLOC +#define STBIW_MALLOC(sz) malloc(sz) +#define STBIW_REALLOC(p,newsz) realloc(p,newsz) +#define STBIW_FREE(p) free(p) +#endif + +#ifndef STBIW_REALLOC_SIZED +#define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) +#endif + + +#ifndef STBIW_MEMMOVE +#define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) +#endif + + +#ifndef STBIW_ASSERT +#include <assert.h> +#define STBIW_ASSERT(x) assert(x) +#endif + +#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) + +typedef struct +{ + stbi_write_func *func; + void *context; +} stbi__write_context; + +// initialize a callback-based context +static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) +{ + s->func = c; + s->context = context; +} + +#ifndef STBI_WRITE_NO_STDIO + +static void stbi__stdio_write(void *context, void *data, int size) +{ + fwrite(data,1,size,(FILE*) context); +} + +static int stbi__start_write_file(stbi__write_context *s, const char *filename) +{ + FILE *f = fopen(filename, "wb"); + stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); + return f != NULL; +} + +static void stbi__end_write_file(stbi__write_context *s) +{ + fclose((FILE *)s->context); +} + +#endif // !STBI_WRITE_NO_STDIO + +typedef unsigned int stbiw_uint32; +typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; + +#ifdef STB_IMAGE_WRITE_STATIC +static int stbi_write_tga_with_rle = 1; +#else +int stbi_write_tga_with_rle = 1; +#endif + +static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) +{ + while (*fmt) { + switch (*fmt++) { + case ' ': break; + case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); + s->func(s->context,&x,1); + break; } + case '2': { int x = va_arg(v,int); + unsigned char b[2]; + b[0] = STBIW_UCHAR(x); + b[1] = STBIW_UCHAR(x>>8); + s->func(s->context,b,2); + break; } + case '4': { stbiw_uint32 x = va_arg(v,int); + unsigned char b[4]; + b[0]=STBIW_UCHAR(x); + b[1]=STBIW_UCHAR(x>>8); + b[2]=STBIW_UCHAR(x>>16); + b[3]=STBIW_UCHAR(x>>24); + s->func(s->context,b,4); + break; } + default: + STBIW_ASSERT(0); + return; + } + } +} + +static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) +{ + va_list v; + va_start(v, fmt); + stbiw__writefv(s, fmt, v); + va_end(v); +} + +static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) +{ + unsigned char arr[3]; + arr[0] = a, arr[1] = b, arr[2] = c; + s->func(s->context, arr, 3); +} + +static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) +{ + unsigned char bg[3] = { 255, 0, 255}, px[3]; + int k; + + if (write_alpha < 0) + s->func(s->context, &d[comp - 1], 1); + + switch (comp) { + case 1: + s->func(s->context,d,1); + break; + case 2: + if (expand_mono) + stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp + else + s->func(s->context, d, 1); // monochrome TGA + break; + case 4: + if (!write_alpha) { + // composite against pink background + for (k = 0; k < 3; ++k) + px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; + stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); + break; + } + /* FALLTHROUGH */ + case 3: + stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); + break; + } + if (write_alpha > 0) + s->func(s->context, &d[comp - 1], 1); +} + +static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) +{ + stbiw_uint32 zero = 0; + int i,j, j_end; + + if (y <= 0) + return; + + if (vdir < 0) + j_end = -1, j = y-1; + else + j_end = y, j = 0; + + for (; j != j_end; j += vdir) { + for (i=0; i < x; ++i) { + unsigned char *d = (unsigned char *) data + (j*x+i)*comp; + stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); + } + s->func(s->context, &zero, scanline_pad); + } +} + +static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) +{ + if (y < 0 || x < 0) { + return 0; + } else { + va_list v; + va_start(v, fmt); + stbiw__writefv(s, fmt, v); + va_end(v); + stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); + return 1; + } +} + +static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) +{ + int pad = (-x*3) & 3; + return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, + "11 4 22 4" "4 44 22 444444", + 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header + 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header +} + +STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) +{ + stbi__write_context s; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_bmp_core(&s, x, y, comp, data); +} + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) +{ + stbi__write_context s; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_bmp_core(&s, x, y, comp, data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif //!STBI_WRITE_NO_STDIO + +static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) +{ + int has_alpha = (comp == 2 || comp == 4); + int colorbytes = has_alpha ? comp-1 : comp; + int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 + + if (y < 0 || x < 0) + return 0; + + if (!stbi_write_tga_with_rle) { + return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, + "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); + } else { + int i,j,k; + + stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8); + + for (j = y - 1; j >= 0; --j) { + unsigned char *row = (unsigned char *) data + j * x * comp; + int len; + + for (i = 0; i < x; i += len) { + unsigned char *begin = row + i * comp; + int diff = 1; + len = 1; + + if (i < x - 1) { + ++len; + diff = memcmp(begin, row + (i + 1) * comp, comp); + if (diff) { + const unsigned char *prev = begin; + for (k = i + 2; k < x && len < 128; ++k) { + if (memcmp(prev, row + k * comp, comp)) { + prev += comp; + ++len; + } else { + --len; + break; + } + } + } else { + for (k = i + 2; k < x && len < 128; ++k) { + if (!memcmp(begin, row + k * comp, comp)) { + ++len; + } else { + break; + } + } + } + } + + if (diff) { + unsigned char header = STBIW_UCHAR(len - 1); + s->func(s->context, &header, 1); + for (k = 0; k < len; ++k) { + stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); + } + } else { + unsigned char header = STBIW_UCHAR(len - 129); + s->func(s->context, &header, 1); + stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); + } + } + } + } + return 1; +} + +int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) +{ + stbi__write_context s; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_tga_core(&s, x, y, comp, (void *) data); +} + +#ifndef STBI_WRITE_NO_STDIO +int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) +{ + stbi__write_context s; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR writer +// by Baldur Karlsson +#ifndef STBI_WRITE_NO_STDIO + +#define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) + +void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) +{ + int exponent; + float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); + + if (maxcomp < 1e-32f) { + rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; + } else { + float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; + + rgbe[0] = (unsigned char)(linear[0] * normalize); + rgbe[1] = (unsigned char)(linear[1] * normalize); + rgbe[2] = (unsigned char)(linear[2] * normalize); + rgbe[3] = (unsigned char)(exponent + 128); + } +} + +void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) +{ + unsigned char lengthbyte = STBIW_UCHAR(length+128); + STBIW_ASSERT(length+128 <= 255); + s->func(s->context, &lengthbyte, 1); + s->func(s->context, &databyte, 1); +} + +void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) +{ + unsigned char lengthbyte = STBIW_UCHAR(length); + STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code + s->func(s->context, &lengthbyte, 1); + s->func(s->context, data, length); +} + +void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) +{ + unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; + unsigned char rgbe[4]; + float linear[3]; + int x; + + scanlineheader[2] = (width&0xff00)>>8; + scanlineheader[3] = (width&0x00ff); + + /* skip RLE for images too small or large */ + if (width < 8 || width >= 32768) { + for (x=0; x < width; x++) { + switch (ncomp) { + case 4: /* fallthrough */ + case 3: linear[2] = scanline[x*ncomp + 2]; + linear[1] = scanline[x*ncomp + 1]; + linear[0] = scanline[x*ncomp + 0]; + break; + default: + linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; + break; + } + stbiw__linear_to_rgbe(rgbe, linear); + s->func(s->context, rgbe, 4); + } + } else { + int c,r; + /* encode into scratch buffer */ + for (x=0; x < width; x++) { + switch(ncomp) { + case 4: /* fallthrough */ + case 3: linear[2] = scanline[x*ncomp + 2]; + linear[1] = scanline[x*ncomp + 1]; + linear[0] = scanline[x*ncomp + 0]; + break; + default: + linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; + break; + } + stbiw__linear_to_rgbe(rgbe, linear); + scratch[x + width*0] = rgbe[0]; + scratch[x + width*1] = rgbe[1]; + scratch[x + width*2] = rgbe[2]; + scratch[x + width*3] = rgbe[3]; + } + + s->func(s->context, scanlineheader, 4); + + /* RLE each component separately */ + for (c=0; c < 4; c++) { + unsigned char *comp = &scratch[width*c]; + + x = 0; + while (x < width) { + // find first run + r = x; + while (r+2 < width) { + if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) + break; + ++r; + } + if (r+2 >= width) + r = width; + // dump up to first run + while (x < r) { + int len = r-x; + if (len > 128) len = 128; + stbiw__write_dump_data(s, len, &comp[x]); + x += len; + } + // if there's a run, output it + if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd + // find next byte after run + while (r < width && comp[r] == comp[x]) + ++r; + // output run up to r + while (x < r) { + int len = r-x; + if (len > 127) len = 127; + stbiw__write_run_data(s, len, comp[x]); + x += len; + } + } + } + } + } +} + +static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) +{ + if (y <= 0 || x <= 0 || data == NULL) + return 0; + else { + // Each component is stored separately. Allocate scratch space for full output scanline. + unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); + int i, len; + char buffer[128]; + char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; + s->func(s->context, header, sizeof(header)-1); + + len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); + s->func(s->context, buffer, len); + + for(i=0; i < y; i++) + stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x); + STBIW_FREE(scratch); + return 1; + } +} + +int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) +{ + stbi__write_context s; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_hdr_core(&s, x, y, comp, (float *) data); +} + +int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) +{ + stbi__write_context s; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif // STBI_WRITE_NO_STDIO + + +////////////////////////////////////////////////////////////////////////////// +// +// PNG writer +// + +// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() +#define stbiw__sbraw(a) ((int *) (a) - 2) +#define stbiw__sbm(a) stbiw__sbraw(a)[0] +#define stbiw__sbn(a) stbiw__sbraw(a)[1] + +#define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) +#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) +#define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) + +#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) +#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) +#define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) + +static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) +{ + int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; + void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); + STBIW_ASSERT(p); + if (p) { + if (!*arr) ((int *) p)[1] = 0; + *arr = (void *) ((int *) p + 2); + stbiw__sbm(*arr) = m; + } + return *arr; +} + +static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) +{ + while (*bitcount >= 8) { + stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); + *bitbuffer >>= 8; + *bitcount -= 8; + } + return data; +} + +static int stbiw__zlib_bitrev(int code, int codebits) +{ + int res=0; + while (codebits--) { + res = (res << 1) | (code & 1); + code >>= 1; + } + return res; +} + +static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) +{ + int i; + for (i=0; i < limit && i < 258; ++i) + if (a[i] != b[i]) break; + return i; +} + +static unsigned int stbiw__zhash(unsigned char *data) +{ + stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); + hash ^= hash << 3; + hash += hash >> 5; + hash ^= hash << 4; + hash += hash >> 17; + hash ^= hash << 25; + hash += hash >> 6; + return hash; +} + +#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) +#define stbiw__zlib_add(code,codebits) \ + (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) +#define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) +// default huffman tables +#define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) +#define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) +#define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) +#define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) +#define stbiw__zlib_huff(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n)) +#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) + +#define stbiw__ZHASH 16384 + +unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) +{ + static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 }; + static unsigned char lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 }; + static unsigned short distc[] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 }; + static unsigned char disteb[] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 }; + unsigned int bitbuf=0; + int i,j, bitcount=0; + unsigned char *out = NULL; + unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**)); + if (quality < 5) quality = 5; + + stbiw__sbpush(out, 0x78); // DEFLATE 32K window + stbiw__sbpush(out, 0x5e); // FLEVEL = 1 + stbiw__zlib_add(1,1); // BFINAL = 1 + stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman + + for (i=0; i < stbiw__ZHASH; ++i) + hash_table[i] = NULL; + + i=0; + while (i < data_len-3) { + // hash next 3 bytes of data to be compressed + int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; + unsigned char *bestloc = 0; + unsigned char **hlist = hash_table[h]; + int n = stbiw__sbcount(hlist); + for (j=0; j < n; ++j) { + if (hlist[j]-data > i-32768) { // if entry lies within window + int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); + if (d >= best) best=d,bestloc=hlist[j]; + } + } + // when hash table entry is too long, delete half the entries + if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { + STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); + stbiw__sbn(hash_table[h]) = quality; + } + stbiw__sbpush(hash_table[h],data+i); + + if (bestloc) { + // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal + h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); + hlist = hash_table[h]; + n = stbiw__sbcount(hlist); + for (j=0; j < n; ++j) { + if (hlist[j]-data > i-32767) { + int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); + if (e > best) { // if next match is better, bail on current match + bestloc = NULL; + break; + } + } + } + } + + if (bestloc) { + int d = (int) (data+i - bestloc); // distance back + STBIW_ASSERT(d <= 32767 && best <= 258); + for (j=0; best > lengthc[j+1]-1; ++j); + stbiw__zlib_huff(j+257); + if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); + for (j=0; d > distc[j+1]-1; ++j); + stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); + if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); + i += best; + } else { + stbiw__zlib_huffb(data[i]); + ++i; + } + } + // write out final bytes + for (;i < data_len; ++i) + stbiw__zlib_huffb(data[i]); + stbiw__zlib_huff(256); // end of block + // pad with 0 bits to byte boundary + while (bitcount) + stbiw__zlib_add(0,1); + + for (i=0; i < stbiw__ZHASH; ++i) + (void) stbiw__sbfree(hash_table[i]); + STBIW_FREE(hash_table); + + { + // compute adler32 on input + unsigned int s1=1, s2=0; + int blocklen = (int) (data_len % 5552); + j=0; + while (j < data_len) { + for (i=0; i < blocklen; ++i) s1 += data[j+i], s2 += s1; + s1 %= 65521, s2 %= 65521; + j += blocklen; + blocklen = 5552; + } + stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); + stbiw__sbpush(out, STBIW_UCHAR(s2)); + stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); + stbiw__sbpush(out, STBIW_UCHAR(s1)); + } + *out_len = stbiw__sbn(out); + // make returned pointer freeable + STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); + return (unsigned char *) stbiw__sbraw(out); +} + +static unsigned int stbiw__crc32(unsigned char *buffer, int len) +{ + static unsigned int crc_table[256] = + { + 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, + 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, + 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, + 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, + 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, + 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, + 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, + 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, + 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, + 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, + 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, + 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, + 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, + 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, + 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, + 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, + 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, + 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, + 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, + 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, + 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, + 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, + 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, + 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, + 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, + 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, + 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, + 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, + 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, + 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, + 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, + 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D + }; + + unsigned int crc = ~0u; + int i; + for (i=0; i < len; ++i) + crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; + return ~crc; +} + +#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4) +#define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); +#define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) + +static void stbiw__wpcrc(unsigned char **data, int len) +{ + unsigned int crc = stbiw__crc32(*data - len - 4, len+4); + stbiw__wp32(*data, crc); +} + +static unsigned char stbiw__paeth(int a, int b, int c) +{ + int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); + if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); + if (pb <= pc) return STBIW_UCHAR(b); + return STBIW_UCHAR(c); +} + +unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) +{ + int ctype[5] = { -1, 0, 4, 2, 6 }; + unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; + unsigned char *out,*o, *filt, *zlib; + signed char *line_buffer; + int i,j,k,p,zlen; + + if (stride_bytes == 0) + stride_bytes = x * n; + + filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; + line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } + for (j=0; j < y; ++j) { + static int mapping[] = { 0,1,2,3,4 }; + static int firstmap[] = { 0,1,0,5,6 }; + int *mymap = j ? mapping : firstmap; + int best = 0, bestval = 0x7fffffff; + for (p=0; p < 2; ++p) { + for (k= p?best:0; k < 5; ++k) { + int type = mymap[k],est=0; + unsigned char *z = pixels + stride_bytes*j; + for (i=0; i < n; ++i) + switch (type) { + case 0: line_buffer[i] = z[i]; break; + case 1: line_buffer[i] = z[i]; break; + case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; + case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break; + case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break; + case 5: line_buffer[i] = z[i]; break; + case 6: line_buffer[i] = z[i]; break; + } + for (i=n; i < x*n; ++i) { + switch (type) { + case 0: line_buffer[i] = z[i]; break; + case 1: line_buffer[i] = z[i] - z[i-n]; break; + case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; + case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break; + case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break; + case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break; + case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; + } + } + if (p) break; + for (i=0; i < x*n; ++i) + est += abs((signed char) line_buffer[i]); + if (est < bestval) { bestval = est; best = k; } + } + } + // when we get here, best contains the filter type, and line_buffer contains the data + filt[j*(x*n+1)] = (unsigned char) best; + STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); + } + STBIW_FREE(line_buffer); + zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory + STBIW_FREE(filt); + if (!zlib) return 0; + + // each tag requires 12 bytes of overhead + out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); + if (!out) return 0; + *out_len = 8 + 12+13 + 12+zlen + 12; + + o=out; + STBIW_MEMMOVE(o,sig,8); o+= 8; + stbiw__wp32(o, 13); // header length + stbiw__wptag(o, "IHDR"); + stbiw__wp32(o, x); + stbiw__wp32(o, y); + *o++ = 8; + *o++ = STBIW_UCHAR(ctype[n]); + *o++ = 0; + *o++ = 0; + *o++ = 0; + stbiw__wpcrc(&o,13); + + stbiw__wp32(o, zlen); + stbiw__wptag(o, "IDAT"); + STBIW_MEMMOVE(o, zlib, zlen); + o += zlen; + STBIW_FREE(zlib); + stbiw__wpcrc(&o, zlen); + + stbiw__wp32(o,0); + stbiw__wptag(o, "IEND"); + stbiw__wpcrc(&o,0); + + STBIW_ASSERT(o == out + *out_len); + + return out; +} + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) +{ + FILE *f; + int len; + unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); + if (png == NULL) return 0; + f = fopen(filename, "wb"); + if (!f) { STBIW_FREE(png); return 0; } + fwrite(png, 1, len, f); + fclose(f); + STBIW_FREE(png); + return 1; +} +#endif + +STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes) +{ + int len; + unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); + if (png == NULL) return 0; + func(context, png, len); + STBIW_FREE(png); + return 1; +} + +#endif // STB_IMAGE_WRITE_IMPLEMENTATION + +/* Revision history + 1.02 (2016-04-02) + avoid allocating large structures on the stack + 1.01 (2016-01-16) + STBIW_REALLOC_SIZED: support allocators with no realloc support + avoid race-condition in crc initialization + minor compile issues + 1.00 (2015-09-14) + installable file IO function + 0.99 (2015-09-13) + warning fixes; TGA rle support + 0.98 (2015-04-08) + added STBIW_MALLOC, STBIW_ASSERT etc + 0.97 (2015-01-18) + fixed HDR asserts, rewrote HDR rle logic + 0.96 (2015-01-17) + add HDR output + fix monochrome BMP + 0.95 (2014-08-17) + add monochrome TGA output + 0.94 (2014-05-31) + rename private functions to avoid conflicts with stb_image.h + 0.93 (2014-05-27) + warning fixes + 0.92 (2010-08-01) + casts to unsigned char to fix warnings + 0.91 (2010-07-17) + first public release + 0.90 first internal release +*/ diff --git a/CMakeLists.txt b/CMakeLists.txt index 03d92c7c4f..2a4fd5e48c 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -196,7 +196,6 @@ add_subdirectory(3party/freetype) add_subdirectory(3party/fribidi) add_subdirectory(3party/expat) add_subdirectory(map) -add_subdirectory(drape) if (PLATFORM_DESKTOP) add_subdirectory(3party/libtess2) @@ -207,6 +206,8 @@ add_compile_options( "-std=c++11" ) +add_subdirectory(3party/stb_image) +add_subdirectory(3party/sdf_image) add_subdirectory(3party/protobuf) add_subdirectory(3party/liboauthcpp) add_subdirectory(3party/pugixml) @@ -219,6 +220,7 @@ add_subdirectory(geometry) add_subdirectory(platform) add_subdirectory(3party/opening_hours) add_subdirectory(stats) +add_subdirectory(drape) add_subdirectory(drape_frontend) add_subdirectory(storage) add_subdirectory(editor) diff --git a/android/jni/Android.mk b/android/jni/Android.mk index 303210bd65..71c6775844 100644 --- a/android/jni/Android.mk +++ b/android/jni/Android.mk @@ -26,7 +26,7 @@ define add_prebuild_static_lib endef prebuild_static_libs := map tracking routing traffic drape_frontend search storage indexer drape platform editor partners_api geometry coding base opening_hours -prebuild_static_libs += pugixml oauthcpp expat freetype fribidi minizip jansson protobuf osrm stats_client succinct +prebuild_static_libs += pugixml oauthcpp expat freetype fribidi minizip jansson protobuf osrm stats_client succinct stb_image sdf_image $(foreach item,$(prebuild_static_libs),$(eval $(call add_prebuild_static_lib,$(item)))) diff --git a/coding/CMakeLists.txt b/coding/CMakeLists.txt index d09d6002b1..51bd2c744b 100644 --- a/coding/CMakeLists.txt +++ b/coding/CMakeLists.txt @@ -3,16 +3,11 @@ project(coding) include_directories( ${OMIM_ROOT}/coding ${OMIM_ROOT}/3party/expat - ${OMIM_ROOT}/3party/lodepng ) set( SRC ${OMIM_ROOT}/3party/expat/expat_impl.h - ${OMIM_ROOT}/3party/lodepng/lodepng.hpp - ${OMIM_ROOT}/3party/lodepng/lodepng_io.hpp - ${OMIM_ROOT}/3party/lodepng/lodepng_io_private.hpp - ${OMIM_ROOT}/3party/lodepng/lodepng.cpp base64.cpp base64.hpp @@ -54,8 +49,6 @@ set( multilang_utf8_string.cpp multilang_utf8_string.hpp parse_xml.hpp - png_memory_encoder.cpp - png_memory_encoder.hpp polymorph_reader.hpp read_write_utils.hpp reader.cpp diff --git a/coding/coding.pro b/coding/coding.pro index 264abb1cc5..4025552cb8 100644 --- a/coding/coding.pro +++ b/coding/coding.pro @@ -8,7 +8,6 @@ ROOT_DIR = .. include($$ROOT_DIR/common.pri) SOURCES += \ - $$ROOT_DIR/3party/lodepng/lodepng.cpp \ base64.cpp \ compressed_bit_vector.cpp \ file_container.cpp \ @@ -20,7 +19,6 @@ SOURCES += \ internal/file_data.cpp \ mmap_reader.cpp \ multilang_utf8_string.cpp \ - png_memory_encoder.cpp \ reader.cpp \ reader_streambuf.cpp \ reader_writer_ops.cpp \ @@ -34,9 +32,6 @@ SOURCES += \ HEADERS += \ $$ROOT_DIR/3party/expat/expat_impl.h \ - $$ROOT_DIR/3party/lodepng/lodepng.hpp \ - $$ROOT_DIR/3party/lodepng/lodepng_io.hpp \ - $$ROOT_DIR/3party/lodepng/lodepng_io_private.hpp \ base64.hpp \ bit_streams.hpp \ buffer_reader.hpp \ @@ -68,7 +63,6 @@ HEADERS += \ mmap_reader.hpp \ multilang_utf8_string.hpp \ parse_xml.hpp \ - png_memory_encoder.hpp \ polymorph_reader.hpp \ read_write_utils.hpp \ reader.hpp \ diff --git a/coding/png_memory_encoder.cpp b/coding/png_memory_encoder.cpp deleted file mode 100644 index 80ac6b4e70..0000000000 --- a/coding/png_memory_encoder.cpp +++ /dev/null @@ -1,17 +0,0 @@ -#include "png_memory_encoder.hpp" -#include "3party/lodepng/lodepng.hpp" - -#include "base/assert.hpp" - -namespace il -{ - -void EncodePngToMemory(uint32_t width, uint32_t height, - vector<uint8_t> const & rgba, - vector<uint8_t> & out) -{ - CHECK(LodePNG::encode(out, rgba, width, height) == 0, ()); - CHECK(out.size() != 0, ()); -} - -} // namespace il diff --git a/coding/png_memory_encoder.hpp b/coding/png_memory_encoder.hpp deleted file mode 100644 index dd2c5b632e..0000000000 --- a/coding/png_memory_encoder.hpp +++ /dev/null @@ -1,13 +0,0 @@ -#pragma once - -#include "std/cstdint.hpp" -#include "std/vector.hpp" - -namespace il -{ - -void EncodePngToMemory(uint32_t width, uint32_t height, - vector<uint8_t> const & rgba, - vector<uint8_t> & out); - -} // namespace il diff --git a/drape/CMakeLists.txt b/drape/CMakeLists.txt index c5fc48816d..4dd9c32e78 100644 --- a/drape/CMakeLists.txt +++ b/drape/CMakeLists.txt @@ -14,8 +14,6 @@ include_directories( ${OMIM_ROOT}/3party/glm ) -append(CMAKE_CXX_FLAGS "-std=c++11 ") - set( DRAPE_COMMON_SRC ${DRAPE_ROOT}/attribute_buffer_mutator.cpp @@ -118,11 +116,6 @@ set( ${DRAPE_ROOT}/vertex_array_buffer.cpp ${DRAPE_ROOT}/vertex_array_buffer.hpp ${DRAPE_ROOT}/visual_scale.hpp - - ${OMIM_ROOT}/3party/sdf_image/sdf_image.cpp - ${OMIM_ROOT}/3party/sdf_image/sdf_image.h - ${OMIM_ROOT}/3party/stb_image/stb_image.c - ${OMIM_ROOT}/3party/stb_image/stb_image.h ) set( diff --git a/drape/drape_common.pri b/drape/drape_common.pri index eb987ee144..3cbede4b76 100644 --- a/drape/drape_common.pri +++ b/drape/drape_common.pri @@ -4,8 +4,6 @@ CMDRES = $$system(python ../tools/autobuild/shader_preprocessor.py $$SHADER_COMP INCLUDEPATH *= $$ROOT_DIR/3party/freetype/include SOURCES += \ - $$ROOT_DIR/3party/sdf_image/sdf_image.cpp \ - $$ROOT_DIR/3party/stb_image/stb_image.c \ $$DRAPE_DIR/attribute_buffer_mutator.cpp \ $$DRAPE_DIR/attribute_provider.cpp \ $$DRAPE_DIR/batcher.cpp \ @@ -52,8 +50,6 @@ SOURCES += \ $$DRAPE_DIR/vertex_array_buffer.cpp \ HEADERS += \ - $$ROOT_DIR/3party/sdf_image/sdf_image.h \ - $$ROOT_DIR/3party/stb_image/stb_image.h \ $$DRAPE_DIR/attribute_buffer_mutator.hpp \ $$DRAPE_DIR/attribute_provider.hpp \ $$DRAPE_DIR/batcher.hpp \ diff --git a/drape/drape_tests/CMakeLists.txt b/drape/drape_tests/CMakeLists.txt index 22bb159dd6..35220e99d2 100644 --- a/drape/drape_tests/CMakeLists.txt +++ b/drape/drape_tests/CMakeLists.txt @@ -61,6 +61,9 @@ omim_link_libraries( stats_client freetype gmock + stb_image + sdf_image + ${Qt5Core_LIBRARIES} ${Qt5Gui_LIBRARIES} ${Qt5Widgets_LIBRARIES} ${LIBZ} diff --git a/drape/drape_tests/drape_tests.pro b/drape/drape_tests/drape_tests.pro index 1aaf5536a2..edaee5b3f4 100644 --- a/drape/drape_tests/drape_tests.pro +++ b/drape/drape_tests/drape_tests.pro @@ -5,7 +5,7 @@ TEMPLATE = app DEFINES += OGL_TEST_ENABLED GTEST_DONT_DEFINE_TEST COMPILER_TESTS ROOT_DIR = ../.. -DEPENDENCIES = qt_tstfrm indexer platform coding geometry base gmock freetype fribidi expat stats_client +DEPENDENCIES = qt_tstfrm indexer platform coding geometry base gmock freetype fribidi expat stats_client stb_image sdf_image SHADER_COMPILE_ARGS = $$PWD/../shaders shader_index.txt shader_def include($$ROOT_DIR/common.pri) diff --git a/drape/static_texture.cpp b/drape/static_texture.cpp index bbdd6c7b1c..f131129b03 100644 --- a/drape/static_texture.cpp +++ b/drape/static_texture.cpp @@ -46,12 +46,11 @@ bool LoadData(string const & textureName, string const & skinPathName, } int w, h, bpp; - unsigned char * data = stbi_png_load_from_memory(&rawData[0], static_cast<int>(rawData.size()), - &w, &h, &bpp, 0); + unsigned char * data = stbi_load_from_memory(&rawData[0], static_cast<int>(rawData.size()), &w, &h, &bpp, 0); ASSERT_EQUAL(bpp, 4, ("Incorrect texture format")); ASSERT(glm::isPowerOfTwo(w), (w)); ASSERT(glm::isPowerOfTwo(h), (h)); - completionHandler(data, w, h); + completionHandler(data, static_cast<uint32_t>(w), static_cast<uint32_t>(h)); stbi_image_free(data); return true; diff --git a/drape/symbols_texture.cpp b/drape/symbols_texture.cpp index bc8dfd381d..4bdad9334f 100644 --- a/drape/symbols_texture.cpp +++ b/drape/symbols_texture.cpp @@ -157,7 +157,7 @@ void LoadSymbols(string const & skinPathName, bool convertToUV, } int w, h, bpp; - unsigned char * data = stbi_png_load_from_memory(&rawData[0], static_cast<int>(rawData.size()), &w, &h, &bpp, 0); + unsigned char * data = stbi_load_from_memory(&rawData[0], static_cast<int>(rawData.size()), &w, &h, &bpp, 0); ASSERT_EQUAL(bpp, 4, ("Incorrect symbols texture format")); ASSERT(glm::isPowerOfTwo(w), (w)); ASSERT(glm::isPowerOfTwo(h), (h)); diff --git a/drape_frontend/drape_frontend_tests/CMakeLists.txt b/drape_frontend/drape_frontend_tests/CMakeLists.txt index 77e8f7202e..8b041880d7 100644 --- a/drape_frontend/drape_frontend_tests/CMakeLists.txt +++ b/drape_frontend/drape_frontend_tests/CMakeLists.txt @@ -27,6 +27,8 @@ omim_link_libraries( base expat stats_client + stb_image + sdf_image ${LIBZ} ) diff --git a/drape_frontend/drape_frontend_tests/drape_frontend_tests.pro b/drape_frontend/drape_frontend_tests/drape_frontend_tests.pro index 36c17b59e4..3913eddda9 100644 --- a/drape_frontend/drape_frontend_tests/drape_frontend_tests.pro +++ b/drape_frontend/drape_frontend_tests/drape_frontend_tests.pro @@ -4,7 +4,7 @@ CONFIG += console warn_on CONFIG -= app_bundle TEMPLATE = app -DEPENDENCIES = drape_frontend drape platform indexer geometry coding base expat stats_client +DEPENDENCIES = drape_frontend drape platform indexer geometry coding base expat stats_client stb_image sdf_image ROOT_DIR = ../.. include($$ROOT_DIR/common.pri) diff --git a/drape_frontend/watch/software_renderer.cpp b/drape_frontend/watch/software_renderer.cpp index dbb84f924a..b7575c0bc2 100644 --- a/drape_frontend/watch/software_renderer.cpp +++ b/drape_frontend/watch/software_renderer.cpp @@ -5,7 +5,6 @@ #include "platform/platform.hpp" -#include "coding/png_memory_encoder.hpp" #include "coding/parse_xml.hpp" #include "indexer/drawing_rules.hpp" @@ -27,6 +26,8 @@ #include "3party/agg/agg_vcgen_stroke.cpp" #include "3party/agg/agg_vcgen_dash.cpp" +#include "3party/stb_image/stb_image_write.h" + namespace df { namespace watch @@ -556,6 +557,16 @@ void SoftwareRenderer::DrawPathText(PathInfo const & geometry, dp::FontDecl cons l.render(face, ren); } +namespace +{ +void StbiWritePngFunc(void * context, void * data, int size) +{ + FrameImage * image = reinterpret_cast<FrameImage *>(context); + image->m_data.resize(size); + memcpy(image->m_data.data(), data, size); +} +} // namespace + void SoftwareRenderer::EndFrame(FrameImage & image) { ASSERT(m_frameWidth > 0 && m_frameHeight > 0, ()); @@ -564,7 +575,11 @@ void SoftwareRenderer::EndFrame(FrameImage & image) image.m_width = m_frameWidth; image.m_height = m_frameHeight; - il::EncodePngToMemory(m_frameWidth, m_frameHeight, m_frameBuffer, image.m_data); + uint8_t const kComponentsCount = 4; + uint8_t const kBytesPerPixel = 4; + stbi_write_png_to_func(&StbiWritePngFunc, &image, m_frameWidth, m_frameHeight, + kComponentsCount, m_frameBuffer.data(), + m_frameWidth * kBytesPerPixel); m_frameWidth = 0; m_frameHeight = 0; } diff --git a/drape_head/drape_head.pro b/drape_head/drape_head.pro index 2c71b98e08..0aad7f0849 100644 --- a/drape_head/drape_head.pro +++ b/drape_head/drape_head.pro @@ -1,7 +1,7 @@ # Head project for drape develop and debuging ROOT_DIR = .. DEPENDENCIES = map traffic drape_frontend drape indexer storage platform geometry coding base \ - freetype expat protobuf jansson fribidi stats_client + freetype expat protobuf jansson fribidi stats_client stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/generator/generator_tests/CMakeLists.txt b/generator/generator_tests/CMakeLists.txt index 12fba997bd..41b5fd6edd 100644 --- a/generator/generator_tests/CMakeLists.txt +++ b/generator/generator_tests/CMakeLists.txt @@ -58,6 +58,8 @@ omim_link_libraries( gflags oauthcpp opening_hours + stb_image + sdf_image ${LIBZ} ) diff --git a/generator/generator_tests/generator_tests.pro b/generator/generator_tests/generator_tests.pro index 1705db4895..53170ce14f 100644 --- a/generator/generator_tests/generator_tests.pro +++ b/generator/generator_tests/generator_tests.pro @@ -7,7 +7,7 @@ ROOT_DIR = ../.. DEPENDENCIES = generator_tests_support platform_tests_support generator drape_frontend routing search storage \ indexer drape map traffic platform editor geometry \ coding base freetype expat fribidi jansson protobuf osrm stats_client \ - minizip succinct pugixml tess2 gflags oauthcpp + minizip succinct pugixml tess2 gflags oauthcpp stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/iphone/Maps/Maps.xcodeproj/project.pbxproj b/iphone/Maps/Maps.xcodeproj/project.pbxproj index 69e7d0d8a4..8e1ee868a1 100644 --- a/iphone/Maps/Maps.xcodeproj/project.pbxproj +++ b/iphone/Maps/Maps.xcodeproj/project.pbxproj @@ -5807,6 +5807,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = Simulator; @@ -5900,6 +5902,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = Debug; @@ -5996,6 +6000,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = AdHoc; @@ -6092,6 +6098,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = "Production Full"; @@ -6188,6 +6196,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = Release; @@ -6285,6 +6295,8 @@ "-loauthcpp", "-leditor", "-ltraffic", + "-lstb_image", + "-lsdf_image", ); }; name = "Simulator Release"; diff --git a/map/framework.cpp b/map/framework.cpp index 0b74eddf84..fa2fb7e4b9 100644 --- a/map/framework.cpp +++ b/map/framework.cpp @@ -73,7 +73,6 @@ #include "coding/zip_reader.hpp" #include "coding/url_encode.hpp" #include "coding/file_name_utils.hpp" -#include "coding/png_memory_encoder.hpp" #include "geometry/angles.hpp" #include "geometry/any_rect2d.hpp" diff --git a/map/map_tests/CMakeLists.txt b/map/map_tests/CMakeLists.txt index 2be098cdb2..a7c86a4987 100644 --- a/map/map_tests/CMakeLists.txt +++ b/map/map_tests/CMakeLists.txt @@ -52,6 +52,8 @@ omim_link_libraries( oauthcpp drape_frontend drape + stb_image + sdf_image ${Qt5Widgets_LIBRARIES} ${Qt5Network_LIBRARIES} ${LIBZ} diff --git a/map/map_tests/map_tests.pro b/map/map_tests/map_tests.pro index 59a471514e..d07711f111 100644 --- a/map/map_tests/map_tests.pro +++ b/map/map_tests/map_tests.pro @@ -7,14 +7,10 @@ TEMPLATE = app ROOT_DIR = ../.. DEPENDENCIES = map drape_frontend routing traffic search storage tracking drape indexer partners_api platform editor geometry coding base \ - freetype fribidi expat protobuf jansson osrm stats_client minizip succinct pugixml stats_client + freetype fribidi expat protobuf jansson osrm stats_client minizip succinct pugixml stats_client stb_image sdf_image DEPENDENCIES *= opening_hours -drape { - DEPENDENCIES *= drape_frontend drape -} - include($$ROOT_DIR/common.pri) DEFINES *= OMIM_UNIT_TEST_WITH_QT_EVENT_LOOP diff --git a/mapshot/mapshot.pro b/mapshot/mapshot.pro index 6c43a5c150..c0d69fddf6 100644 --- a/mapshot/mapshot.pro +++ b/mapshot/mapshot.pro @@ -3,7 +3,7 @@ ROOT_DIR = .. DEPENDENCIES = map drape_frontend routing search storage tracking traffic indexer drape partners_api platform editor geometry coding base \ freetype expat fribidi gflags jansson protobuf osrm stats_client minizip succinct \ - pugixml opening_hours + pugixml opening_hours stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/qt/CMakeLists.txt b/qt/CMakeLists.txt index 2388ab3580..236f74a117 100644 --- a/qt/CMakeLists.txt +++ b/qt/CMakeLists.txt @@ -89,6 +89,9 @@ omim_link_libraries( oauthcpp opening_hours openlr + stb_image + sdf_image + ${Qt5Core_LIBRARIES} ${Qt5Gui_LIBRARIES} ${Qt5Network_LIBRARIES} ${Qt5Widgets_LIBRARIES} @@ -2,7 +2,7 @@ ROOT_DIR = .. DEPENDENCIES = map drape_frontend openlr routing search storage tracking traffic indexer drape partners_api platform editor geometry \ coding base freetype expat fribidi jansson protobuf osrm stats_client \ - minizip succinct pugixml oauthcpp + minizip succinct pugixml oauthcpp stb_image sdf_image DEPENDENCIES += opening_hours \ diff --git a/search/search_quality/features_collector_tool/features_collector_tool.pro b/search/search_quality/features_collector_tool/features_collector_tool.pro index e191fb5828..fc57253608 100644 --- a/search/search_quality/features_collector_tool/features_collector_tool.pro +++ b/search/search_quality/features_collector_tool/features_collector_tool.pro @@ -10,7 +10,7 @@ ROOT_DIR = ../../.. DEPENDENCIES = map drape_frontend traffic routing search_tests_support search search_quality storage indexer drape \ platform editor geometry coding base freetype expat fribidi gflags \ jansson protobuf osrm stats_client minizip succinct \ - opening_hours pugixml + opening_hours pugixml stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/search/search_quality/search_quality_tests/search_quality_tests.pro b/search/search_quality/search_quality_tests/search_quality_tests.pro index 929b492445..0772787881 100644 --- a/search/search_quality/search_quality_tests/search_quality_tests.pro +++ b/search/search_quality/search_quality_tests/search_quality_tests.pro @@ -9,7 +9,7 @@ ROOT_DIR = ../../.. # todo(@m) revise DEPENDENCIES = map drape_frontend traffic routing search_tests_support search search_quality storage indexer drape platform geometry coding base \ freetype expat fribidi gflags jansson protobuf osrm stats_client minizip succinct \ - opening_hours + opening_hours stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/search/search_quality/search_quality_tool/search_quality_tool.pro b/search/search_quality/search_quality_tool/search_quality_tool.pro index 6897b50550..6e71e6b301 100644 --- a/search/search_quality/search_quality_tool/search_quality_tool.pro +++ b/search/search_quality/search_quality_tool/search_quality_tool.pro @@ -10,7 +10,7 @@ ROOT_DIR = ../../.. DEPENDENCIES = map drape_frontend traffic routing search_tests_support search search_quality storage indexer drape \ platform editor geometry coding base freetype expat fribidi gflags \ jansson protobuf osrm stats_client minizip succinct \ - opening_hours pugixml + opening_hours pugixml stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/storage/storage_integration_tests/CMakeLists.txt b/storage/storage_integration_tests/CMakeLists.txt index cbabeadde9..1e8fc35df3 100644 --- a/storage/storage_integration_tests/CMakeLists.txt +++ b/storage/storage_integration_tests/CMakeLists.txt @@ -47,6 +47,8 @@ omim_link_libraries( succinct pugixml oauthcpp + stb_image + sdf_image ${Qt5Widgets_LIBRARIES} ${Qt5Network_LIBRARIES} ${LIBZ} diff --git a/storage/storage_integration_tests/storage_integration_tests.pro b/storage/storage_integration_tests/storage_integration_tests.pro index 2664eb5ed2..d9ddd4ce5c 100644 --- a/storage/storage_integration_tests/storage_integration_tests.pro +++ b/storage/storage_integration_tests/storage_integration_tests.pro @@ -8,7 +8,7 @@ TEMPLATE = app ROOT_DIR = ../.. DEPENDENCIES = map drape_frontend routing search storage tracking traffic indexer drape partners_api platform_tests_support platform editor opening_hours geometry \ coding base freetype expat fribidi jansson protobuf osrm stats_client \ - minizip succinct pugixml oauthcpp + minizip succinct pugixml oauthcpp stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/storage/storage_tests/CMakeLists.txt b/storage/storage_tests/CMakeLists.txt index cce948625e..1dd9ea51dc 100644 --- a/storage/storage_tests/CMakeLists.txt +++ b/storage/storage_tests/CMakeLists.txt @@ -52,6 +52,8 @@ omim_link_libraries( minizip succinct pugixml + stb_image + sdf_image ${Qt5Widgets_LIBRARIES} ${Qt5Network_LIBRARIES} ${LIBZ} diff --git a/storage/storage_tests/storage_tests.pro b/storage/storage_tests/storage_tests.pro index 3f6eff1075..764c5410ae 100644 --- a/storage/storage_tests/storage_tests.pro +++ b/storage/storage_tests/storage_tests.pro @@ -14,7 +14,7 @@ DEPENDENCIES = generator_tests_support generator DEPENDENCIES *= drape_frontend map routing traffic \ search storage indexer drape platform_tests_support platform editor opening_hours geometry \ coding base freetype expat fribidi jansson tess2 protobuf osrm stats_client \ - minizip succinct pugixml oauthcpp + minizip succinct pugixml oauthcpp stb_image sdf_image include($$ROOT_DIR/common.pri) diff --git a/xcode/coding/coding.xcodeproj/project.pbxproj b/xcode/coding/coding.xcodeproj/project.pbxproj index 3069dad815..9cb95f2dc0 100644 --- a/xcode/coding/coding.xcodeproj/project.pbxproj +++ b/xcode/coding/coding.xcodeproj/project.pbxproj @@ -33,8 +33,6 @@ 670D04BF1B0BA92D0013A7AC /* file_data.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 670D04B51B0BA9050013A7AC /* file_data.cpp */; }; 670D04C01B0BA92D0013A7AC /* file_data.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 670D04B61B0BA9050013A7AC /* file_data.hpp */; }; 670D04C11B0BA92D0013A7AC /* xmlparser.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 670D04B71B0BA9050013A7AC /* xmlparser.hpp */; }; - 674A29C61B26F828001A525C /* png_memory_encoder.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 67D1C81A1AE541C300A239E3 /* png_memory_encoder.cpp */; }; - 674A29C91B26F93F001A525C /* png_memory_encoder.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 67D1C81B1AE541C300A239E3 /* png_memory_encoder.hpp */; }; 675342821A3F588C00A0A8C3 /* base64.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 6753422B1A3F588B00A0A8C3 /* base64.cpp */; }; 675342831A3F588C00A0A8C3 /* base64.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 6753422C1A3F588B00A0A8C3 /* base64.hpp */; }; 675342861A3F588C00A0A8C3 /* bit_streams.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 6753422F1A3F588B00A0A8C3 /* bit_streams.hpp */; }; @@ -232,8 +230,6 @@ 675E889A1DB7B0D000F8EBDA /* traffic.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = traffic.cpp; sourceTree = "<group>"; }; 675E889B1DB7B0D000F8EBDA /* traffic.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = traffic.hpp; sourceTree = "<group>"; }; 6768181F1DC3ABD80094C0AC /* traffic_test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = traffic_test.cpp; sourceTree = "<group>"; }; - 67D1C81A1AE541C300A239E3 /* png_memory_encoder.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = png_memory_encoder.cpp; sourceTree = "<group>"; }; - 67D1C81B1AE541C300A239E3 /* png_memory_encoder.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = png_memory_encoder.hpp; sourceTree = "<group>"; }; 67E8DB081BBC16C70053C5BA /* base64_test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = base64_test.cpp; sourceTree = "<group>"; }; 67E8DB091BBC16C70053C5BA /* bit_streams_test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = bit_streams_test.cpp; sourceTree = "<group>"; }; 67E8DB0B1BBC16C70053C5BA /* coder_test.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = coder_test.hpp; sourceTree = "<group>"; }; @@ -426,8 +422,6 @@ 6753425A1A3F588B00A0A8C3 /* multilang_utf8_string.cpp */, 6753425B1A3F588B00A0A8C3 /* multilang_utf8_string.hpp */, 6753425C1A3F588B00A0A8C3 /* parse_xml.hpp */, - 67D1C81A1AE541C300A239E3 /* png_memory_encoder.cpp */, - 67D1C81B1AE541C300A239E3 /* png_memory_encoder.hpp */, 6753425D1A3F588B00A0A8C3 /* polymorph_reader.hpp */, 6753425E1A3F588B00A0A8C3 /* read_write_utils.hpp */, 6753425F1A3F588B00A0A8C3 /* reader_cache.hpp */, @@ -527,7 +521,6 @@ 675342861A3F588C00A0A8C3 /* bit_streams.hpp in Headers */, 675342A01A3F588C00A0A8C3 /* file_reader.hpp in Headers */, 675342C71A3F588C00A0A8C3 /* url_encode.hpp in Headers */, - 674A29C91B26F93F001A525C /* png_memory_encoder.hpp in Headers */, 675342BC1A3F588C00A0A8C3 /* reader.hpp in Headers */, 675342D21A3F588C00A0A8C3 /* zip_creator.hpp in Headers */, 675342B11A3F588C00A0A8C3 /* multilang_utf8_string.hpp in Headers */, @@ -674,7 +667,6 @@ 675342A71A3F588C00A0A8C3 /* hex.cpp in Sources */, 675342A31A3F588C00A0A8C3 /* file_writer.cpp in Sources */, 670D04BF1B0BA92D0013A7AC /* file_data.cpp in Sources */, - 674A29C61B26F828001A525C /* png_memory_encoder.cpp in Sources */, 675342CC1A3F588C00A0A8C3 /* varint_vector.cpp in Sources */, 675342B91A3F588C00A0A8C3 /* reader_writer_ops.cpp in Sources */, 675E889C1DB7B0D000F8EBDA /* traffic.cpp in Sources */, diff --git a/xcode/lodepng/lodepng.xcodeproj/project.pbxproj b/xcode/lodepng/lodepng.xcodeproj/project.pbxproj deleted file mode 100644 index b409083153..0000000000 --- a/xcode/lodepng/lodepng.xcodeproj/project.pbxproj +++ /dev/null @@ -1,196 +0,0 @@ -// !$*UTF8*$! -{ - archiveVersion = 1; - classes = { - }; - objectVersion = 46; - objects = { - -/* Begin PBXBuildFile section */ - 67E8DB031BBC13690053C5BA /* lodepng_io_private.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 67E8DAFF1BBC13690053C5BA /* lodepng_io_private.hpp */; }; - 67E8DB041BBC13690053C5BA /* lodepng_io.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 67E8DB001BBC13690053C5BA /* lodepng_io.hpp */; }; - 67E8DB051BBC13690053C5BA /* lodepng.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 67E8DB011BBC13690053C5BA /* lodepng.cpp */; }; - 67E8DB061BBC13690053C5BA /* lodepng.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 67E8DB021BBC13690053C5BA /* lodepng.hpp */; }; -/* End PBXBuildFile section */ - -/* Begin PBXFileReference section */ - 34F5586C1DBF495000A4FC11 /* common-debug.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-debug.xcconfig"; path = "../common-debug.xcconfig"; sourceTree = "<group>"; }; - 34F5586D1DBF495000A4FC11 /* common-release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-release.xcconfig"; path = "../common-release.xcconfig"; sourceTree = "<group>"; }; - 67E8DAF61BBC12560053C5BA /* liblodepng.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = liblodepng.a; sourceTree = BUILT_PRODUCTS_DIR; }; - 67E8DAFF1BBC13690053C5BA /* lodepng_io_private.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = lodepng_io_private.hpp; path = ../../3party/lodepng/lodepng_io_private.hpp; sourceTree = "<group>"; }; - 67E8DB001BBC13690053C5BA /* lodepng_io.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = lodepng_io.hpp; path = ../../3party/lodepng/lodepng_io.hpp; sourceTree = "<group>"; }; - 67E8DB011BBC13690053C5BA /* lodepng.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = lodepng.cpp; path = ../../3party/lodepng/lodepng.cpp; sourceTree = "<group>"; }; - 67E8DB021BBC13690053C5BA /* lodepng.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = lodepng.hpp; path = ../../3party/lodepng/lodepng.hpp; sourceTree = "<group>"; }; -/* End PBXFileReference section */ - -/* Begin PBXFrameworksBuildPhase section */ - 67E8DAF31BBC12560053C5BA /* Frameworks */ = { - isa = PBXFrameworksBuildPhase; - buildActionMask = 2147483647; - files = ( - ); - runOnlyForDeploymentPostprocessing = 0; - }; -/* End PBXFrameworksBuildPhase section */ - -/* Begin PBXGroup section */ - 67E8DAED1BBC12560053C5BA = { - isa = PBXGroup; - children = ( - 34F5586C1DBF495000A4FC11 /* common-debug.xcconfig */, - 34F5586D1DBF495000A4FC11 /* common-release.xcconfig */, - 67E8DAFE1BBC13480053C5BA /* lodepng */, - 67E8DAF71BBC12560053C5BA /* Products */, - ); - sourceTree = "<group>"; - }; - 67E8DAF71BBC12560053C5BA /* Products */ = { - isa = PBXGroup; - children = ( - 67E8DAF61BBC12560053C5BA /* liblodepng.a */, - ); - name = Products; - sourceTree = "<group>"; - }; - 67E8DAFE1BBC13480053C5BA /* lodepng */ = { - isa = PBXGroup; - children = ( - 67E8DAFF1BBC13690053C5BA /* lodepng_io_private.hpp */, - 67E8DB001BBC13690053C5BA /* lodepng_io.hpp */, - 67E8DB011BBC13690053C5BA /* lodepng.cpp */, - 67E8DB021BBC13690053C5BA /* lodepng.hpp */, - ); - name = lodepng; - sourceTree = "<group>"; - }; -/* End PBXGroup section */ - -/* Begin PBXHeadersBuildPhase section */ - 67E8DAF41BBC12560053C5BA /* Headers */ = { - isa = PBXHeadersBuildPhase; - buildActionMask = 2147483647; - files = ( - 67E8DB061BBC13690053C5BA /* lodepng.hpp in Headers */, - 67E8DB041BBC13690053C5BA /* lodepng_io.hpp in Headers */, - 67E8DB031BBC13690053C5BA /* lodepng_io_private.hpp in Headers */, - ); - runOnlyForDeploymentPostprocessing = 0; - }; -/* End PBXHeadersBuildPhase section */ - -/* Begin PBXNativeTarget section */ - 67E8DAF51BBC12560053C5BA /* lodepng */ = { - isa = PBXNativeTarget; - buildConfigurationList = 67E8DAFA1BBC12560053C5BA /* Build configuration list for PBXNativeTarget "lodepng" */; - buildPhases = ( - 67E8DAF21BBC12560053C5BA /* Sources */, - 67E8DAF31BBC12560053C5BA /* Frameworks */, - 67E8DAF41BBC12560053C5BA /* Headers */, - ); - buildRules = ( - ); - dependencies = ( - ); - name = lodepng; - productName = lodepng; - productReference = 67E8DAF61BBC12560053C5BA /* liblodepng.a */; - productType = "com.apple.product-type.library.static"; - }; -/* End PBXNativeTarget section */ - -/* Begin PBXProject section */ - 67E8DAEE1BBC12560053C5BA /* Project object */ = { - isa = PBXProject; - attributes = { - LastUpgradeCheck = 0700; - ORGANIZATIONNAME = maps.me; - TargetAttributes = { - 67E8DAF51BBC12560053C5BA = { - CreatedOnToolsVersion = 7.0; - }; - }; - }; - buildConfigurationList = 67E8DAF11BBC12560053C5BA /* Build configuration list for PBXProject "lodepng" */; - compatibilityVersion = "Xcode 3.2"; - developmentRegion = English; - hasScannedForEncodings = 0; - knownRegions = ( - en, - ); - mainGroup = 67E8DAED1BBC12560053C5BA; - productRefGroup = 67E8DAF71BBC12560053C5BA /* Products */; - projectDirPath = ""; - projectRoot = ""; - targets = ( - 67E8DAF51BBC12560053C5BA /* lodepng */, - ); - }; -/* End PBXProject section */ - -/* Begin PBXSourcesBuildPhase section */ - 67E8DAF21BBC12560053C5BA /* Sources */ = { - isa = PBXSourcesBuildPhase; - buildActionMask = 2147483647; - files = ( - 67E8DB051BBC13690053C5BA /* lodepng.cpp in Sources */, - ); - runOnlyForDeploymentPostprocessing = 0; - }; -/* End PBXSourcesBuildPhase section */ - -/* Begin XCBuildConfiguration section */ - 67E8DAF81BBC12560053C5BA /* Debug */ = { - isa = XCBuildConfiguration; - baseConfigurationReference = 34F5586C1DBF495000A4FC11 /* common-debug.xcconfig */; - buildSettings = { - }; - name = Debug; - }; - 67E8DAF91BBC12560053C5BA /* Release */ = { - isa = XCBuildConfiguration; - baseConfigurationReference = 34F5586D1DBF495000A4FC11 /* common-release.xcconfig */; - buildSettings = { - }; - name = Release; - }; - 67E8DAFB1BBC12560053C5BA /* Debug */ = { - isa = XCBuildConfiguration; - buildSettings = { - EXECUTABLE_PREFIX = lib; - PRODUCT_NAME = "$(TARGET_NAME)"; - }; - name = Debug; - }; - 67E8DAFC1BBC12560053C5BA /* Release */ = { - isa = XCBuildConfiguration; - buildSettings = { - EXECUTABLE_PREFIX = lib; - PRODUCT_NAME = "$(TARGET_NAME)"; - }; - name = Release; - }; -/* End XCBuildConfiguration section */ - -/* Begin XCConfigurationList section */ - 67E8DAF11BBC12560053C5BA /* Build configuration list for PBXProject "lodepng" */ = { - isa = XCConfigurationList; - buildConfigurations = ( - 67E8DAF81BBC12560053C5BA /* Debug */, - 67E8DAF91BBC12560053C5BA /* Release */, - ); - defaultConfigurationIsVisible = 0; - defaultConfigurationName = Release; - }; - 67E8DAFA1BBC12560053C5BA /* Build configuration list for PBXNativeTarget "lodepng" */ = { - isa = XCConfigurationList; - buildConfigurations = ( - 67E8DAFB1BBC12560053C5BA /* Debug */, - 67E8DAFC1BBC12560053C5BA /* Release */, - ); - defaultConfigurationIsVisible = 0; - defaultConfigurationName = Release; - }; -/* End XCConfigurationList section */ - }; - rootObject = 67E8DAEE1BBC12560053C5BA /* Project object */; -} diff --git a/xcode/stb_image/stb_image.xcodeproj/project.pbxproj b/xcode/stb_image/stb_image.xcodeproj/project.pbxproj index 20bc4b7244..f0bd37ff2b 100644 --- a/xcode/stb_image/stb_image.xcodeproj/project.pbxproj +++ b/xcode/stb_image/stb_image.xcodeproj/project.pbxproj @@ -7,15 +7,17 @@ objects = { /* Begin PBXBuildFile section */ - 675D21C51BFB8F2B00717E4F /* stb_image.c in Sources */ = {isa = PBXBuildFile; fileRef = 675D21C31BFB8F2B00717E4F /* stb_image.c */; }; + 4553E0E91E571AA400FA9CFF /* stb_image_write.h in Headers */ = {isa = PBXBuildFile; fileRef = 4553E0E71E571AA400FA9CFF /* stb_image_write.h */; }; + 4553E0EA1E571AA400FA9CFF /* stb_image.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4553E0E81E571AA400FA9CFF /* stb_image.cpp */; }; 675D21C61BFB8F2B00717E4F /* stb_image.h in Headers */ = {isa = PBXBuildFile; fileRef = 675D21C41BFB8F2B00717E4F /* stb_image.h */; }; /* End PBXBuildFile section */ /* Begin PBXFileReference section */ 34EBB47E1DBF52D3005BE9B8 /* common-debug.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-debug.xcconfig"; path = "../common-debug.xcconfig"; sourceTree = "<group>"; }; 34EBB47F1DBF52D3005BE9B8 /* common-release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-release.xcconfig"; path = "../common-release.xcconfig"; sourceTree = "<group>"; }; + 4553E0E71E571AA400FA9CFF /* stb_image_write.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = stb_image_write.h; sourceTree = "<group>"; }; + 4553E0E81E571AA400FA9CFF /* stb_image.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = stb_image.cpp; sourceTree = "<group>"; }; 675D21BA1BFB8DBA00717E4F /* libstb_image.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libstb_image.a; sourceTree = BUILT_PRODUCTS_DIR; }; - 675D21C31BFB8F2B00717E4F /* stb_image.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = stb_image.c; sourceTree = "<group>"; }; 675D21C41BFB8F2B00717E4F /* stb_image.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = stb_image.h; sourceTree = "<group>"; }; /* End PBXFileReference section */ @@ -51,7 +53,8 @@ 675D21C21BFB8F1000717E4F /* stb_image */ = { isa = PBXGroup; children = ( - 675D21C31BFB8F2B00717E4F /* stb_image.c */, + 4553E0E71E571AA400FA9CFF /* stb_image_write.h */, + 4553E0E81E571AA400FA9CFF /* stb_image.cpp */, 675D21C41BFB8F2B00717E4F /* stb_image.h */, ); name = stb_image; @@ -65,6 +68,7 @@ isa = PBXHeadersBuildPhase; buildActionMask = 2147483647; files = ( + 4553E0E91E571AA400FA9CFF /* stb_image_write.h in Headers */, 675D21C61BFB8F2B00717E4F /* stb_image.h in Headers */, ); runOnlyForDeploymentPostprocessing = 0; @@ -125,7 +129,7 @@ isa = PBXSourcesBuildPhase; buildActionMask = 2147483647; files = ( - 675D21C51BFB8F2B00717E4F /* stb_image.c in Sources */, + 4553E0EA1E571AA400FA9CFF /* stb_image.cpp in Sources */, ); runOnlyForDeploymentPostprocessing = 0; }; |