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|
// pngdib.c
//
// PNGDIB - a mini PNG<->DIB (BMP) image conversion library for Win32
// By Jason Summers
// This software may be used without restriction.
//
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <malloc.h>
#include <math.h>
#include "../../libpng/png.h"
#define PNGDIB_INTERNALS
#include "pngdib.h"
#define PNGDIB_SRC_VERSION 30001
#define PNGDIB_SRC_VERSION_STRING _T("3.0.1")
#if PNGDIB_SRC_VERSION != PNGDIB_HEADER_VERSION
#error Wrong PNGDIB header file version
#endif
#if (PNG_LIBPNG_VER<10202) || \
(PNG_LIBPNG_VER==10202 && PNG_LIBPNG_BUILD_TYPE<2) || \
(PNG_LIBPNG_VER==10202 && PNG_LIBPNG_BUILD_TYPE==2 && PNG_LIBPNG_VER_BUILD<5)
#error libpng 1.2.2b5 or higher is recommended
/* You can comment out the previous line if you aren't using gamma
* correction, or don't care about a few obscure gamma correction
* problems that exist in earlier versions of libpng. */
#endif
// This is basically a Windows-only utility with a simple-as-possible
// interface, so I'm not too concerned about allowing a
// user-configurable screen gamma.
//static const double screen_gamma = 2.2;
#define MAX_ERRMSGLEN 100
struct errstruct {
jmp_buf *jbufp;
TCHAR *errmsg;
};
static void pngd_get_error_message(int rv,TCHAR *e)
{
switch(rv) {
case PNGD_E_ERROR: lstrcpy(e,_T("Unknown error")); break;
case PNGD_E_VERSION: lstrcpy(e,_T("Incompatible library version")); break;
case PNGD_E_NOMEM: lstrcpy(e,_T("Unable to allocate memory")); break;
case PNGD_E_UNSUPP: lstrcpy(e,_T("Invalid or unsupported image")); break;
case PNGD_E_LIBPNG: lstrcpy(e,_T("libpng reported an error")); break;
case PNGD_E_BADBMP: lstrcpy(e,_T("Invalid BMP image")); break;
case PNGD_E_BADPNG: lstrcpy(e,_T("Invalid PNG image")); break;
case PNGD_E_READ: lstrcpy(e,_T("Unable to read file")); break;
case PNGD_E_WRITE: lstrcpy(e,_T("Unable to write file")); break;
}
}
static unsigned char* uncompress_dib(LPBITMAPINFO lpbmi1, int infosize, void *lpbits1)
{
LPBITMAPINFOHEADER lpdib2;
unsigned char *lpbits2;
void *whatever;
int linesize, bitssize;
HBITMAP hb;
HDC hdc;
HGDIOBJ rvgdi;
int rvi;
int width,height;
LPBITMAPINFOHEADER lpdib1;
lpdib1=(LPBITMAPINFOHEADER)lpbmi1;
width=lpdib1->biWidth;
height=lpdib1->biHeight;
linesize= (((width * lpdib1->biBitCount)+31)/32)*4;
bitssize= linesize*height;
lpdib2= (LPBITMAPINFOHEADER)malloc(infosize);
if(!lpdib2) return NULL;
// create a header for the new uncompressed DIB
CopyMemory((void*)lpdib2,(void*)lpdib1,infosize);
lpdib2->biCompression=BI_RGB;
lpdib2->biSizeImage=0;
lpbits2= (unsigned char*)malloc(bitssize);
if(!lpbits2) { free((void*)lpdib2); return NULL; }
// Windows bitmap handling functions are not exactly convenient,
// especially when trying to deal with DIBs. Every function wants
// to convert them into DDBs. We have to play stupid games and
// convert back and forth. This probably uses too much memory,
// and I'm not 100% sure it is exactly correct, but it seems to
// work for me.
hb=CreateDIBSection(NULL,(LPBITMAPINFO)lpdib2,DIB_RGB_COLORS,&whatever,NULL,0);
hdc=CreateCompatibleDC(NULL);
rvgdi=SelectObject(hdc,hb);
//SetStretchBltMode(hdc,COLORONCOLOR);
rvi=StretchDIBits(hdc,
0,0,width,height,
0,0,width,height,
lpbits1, (LPBITMAPINFO)lpdib1,
DIB_RGB_COLORS,SRCCOPY);
rvi=GetDIBits(hdc,hb,0,height, (LPVOID)lpbits2,
(LPBITMAPINFO)lpdib2,DIB_RGB_COLORS);
DeleteDC(hdc);
DeleteObject(hb);
free((void*)lpdib2);
return lpbits2;
}
static void my_png_error_fn(png_structp png_ptr, const char *err_msg)
{
struct errstruct *errinfop;
jmp_buf *j;
errinfop = (struct errstruct *)png_get_error_ptr(png_ptr);
j = errinfop->jbufp;
#ifdef _UNICODE
_snwprintf(errinfop->errmsg,MAX_ERRMSGLEN,_T("[libpng] %S"),err_msg);
#else
_snprintf(errinfop->errmsg,MAX_ERRMSGLEN,"[libpng] %s",err_msg);
#endif
errinfop->errmsg[MAX_ERRMSGLEN-1]='\0';
longjmp(*j, -1);
}
static void my_png_warning_fn(png_structp png_ptr, const char *warn_msg)
{
return;
}
// A callback function used when reading memory-mapped PNG files.
static void my_png_read_fn(png_structp png_ptr,
png_bytep data, png_size_t length)
{
struct p2d_struct *p2d;
p2d = (struct p2d_struct*)png_get_io_ptr(png_ptr);
if(p2d->input_memblk_size>0) {
if((int)length > (p2d->input_memblk_size - p2d->input_memblk_curpos)) {
png_error(png_ptr, "read error: unexpected end of file");
return;
}
}
CopyMemory((void*)data,(void*)&p2d->input_memblk[p2d->input_memblk_curpos],length);
p2d->input_memblk_curpos+=length;
}
// This function should perform identically to libpng's gamma correction.
// I'd prefer to have libpng do all gamma correction itself,
// but I can't figure out how to do that efficiently.
static void gamma_correct(double screen_gamma,double file_gamma,
unsigned char *red, unsigned char *green, unsigned char *blue)
{
double g;
#ifndef PNG_GAMMA_THRESHOLD
# define PNG_GAMMA_THRESHOLD 0.05
#endif
if(fabs(screen_gamma*file_gamma-1.0)<=PNG_GAMMA_THRESHOLD) return;
if (screen_gamma>0.000001)
g=1.0/(file_gamma*screen_gamma);
else
g=1.0;
(*red) = (unsigned char)(pow((double)(*red )/255.0,g)*255.0+0.5);
(*green) = (unsigned char)(pow((double)(*green)/255.0,g)*255.0+0.5);
(*blue) = (unsigned char)(pow((double)(*blue )/255.0,g)*255.0+0.5);
}
int PNGDIB_DECL pngdib_p2d_run(PNGDIB *qq)
{
struct p2d_struct *p2d;
png_structp png_ptr;
png_infop info_ptr;
jmp_buf jbuf;
struct errstruct errinfo;
png_uint_32 width, height;
int png_bit_depth, color_type, interlace_type;
png_colorp png_palette;
png_uint_32 res_x, res_y;
int has_phys, has_gama;
int res_unit_type;
FILE *fp;
int palette_entries;
unsigned char **row_pointers;
unsigned char *lpdib;
unsigned char *dib_palette;
unsigned char *dib_bits;
unsigned char *tmprow;
int dib_bpp, dib_bytesperrow;
int i,j;
int rv;
png_color_16 bkgd; // used with png_set_background
int has_trns, trns_color;
int has_bkgd; // ==1 if there a bkgd chunk, and USE_BKGD flag
png_color_16p temp_colorp;
png_color_16p bg_colorp; // background color (if has_bkgd)
png_bytep trns_trans;
int manual_trns;
int manual_gamma;
struct PNGD_COLOR_struct bkgd_color;
int is_grayscale,has_alpha_channel;
double file_gamma;
int dib_alpha32;
int write_bitfields;
p2d=(struct p2d_struct*)qq;
dib_alpha32=0;
write_bitfields=0;
manual_trns=0;
has_trns=has_bkgd=0;
rv=PNGD_E_ERROR;
png_ptr=NULL;
info_ptr=NULL;
fp=NULL;
row_pointers=NULL;
lpdib=NULL;
lstrcpy(p2d->common.errmsg,_T(""));
if(p2d->use_custom_bg_flag) {
bkgd_color.red= p2d->bgcolor.red;
bkgd_color.green= p2d->bgcolor.green;
bkgd_color.blue= p2d->bgcolor.blue;
}
else {
bkgd_color.red= 255; // Should never get used. If the
bkgd_color.green= 128; // background turns orange, it's a bug.
bkgd_color.blue= 0;
}
// Set the user-defined pointer to point to our jmp_buf. This will
// hopefully protect against potentially different sized jmp_buf's in
// libpng, while still allowing this library to be threadsafe.
errinfo.jbufp = &jbuf;
errinfo.errmsg = p2d->common.errmsg;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,(void*)(&errinfo),
my_png_error_fn, my_png_warning_fn);
if(!png_ptr) { rv=PNGD_E_NOMEM; goto abort; }
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) {
//png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
rv=PNGD_E_NOMEM; goto abort;
}
if(setjmp(jbuf)) {
// we'll get here if an error occurred in any of the following
// png_ functions
rv=PNGD_E_LIBPNG;
goto abort;
}
if(p2d->input_method==0) {
// reading from a filename
if(!p2d->input_filename) {
wsprintf(p2d->common.errmsg,_T("Input filename not set"));
rv=PNGD_E_ERROR; goto abort;
}
if((fp = _tfopen(p2d->input_filename,_T("rb"))) == NULL) {
rv=PNGD_E_READ;
goto abort;
}
png_init_io(png_ptr, fp);
}
else if(p2d->input_method==1) {
// reading from a memory block
p2d->input_memblk_curpos=0;
png_set_read_fn(png_ptr, (void*)p2d, my_png_read_fn);
}
else { goto abort; }
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &png_bit_depth, &color_type,
&interlace_type, NULL, NULL);
p2d->color_type=color_type;
p2d->bits_per_sample=png_bit_depth;
p2d->interlace=interlace_type;
switch(color_type) {
case PNG_COLOR_TYPE_RGB: p2d->bits_per_pixel=png_bit_depth*3; break;
case PNG_COLOR_TYPE_RGB_ALPHA: p2d->bits_per_pixel=png_bit_depth*4; break;
case PNG_COLOR_TYPE_GRAY_ALPHA: p2d->bits_per_pixel=png_bit_depth*2; break;
default: p2d->bits_per_pixel=png_bit_depth;
}
is_grayscale = !(color_type&PNG_COLOR_MASK_COLOR);
has_alpha_channel = (color_type&PNG_COLOR_MASK_ALPHA)?1:0;
has_trns = png_get_valid(png_ptr,info_ptr,PNG_INFO_tRNS);
if(p2d->common.dib_alpha32 && (has_trns || has_alpha_channel)) {
// Fixme - if trns(for palette) has no transparent entries,
// we could skip this.
dib_alpha32=1;
write_bitfields=1;
if (!(color_type&PNG_COLOR_MASK_COLOR)) {
png_set_gray_to_rgb(png_ptr);
}
else if(color_type==PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
}
if (has_trns) png_set_tRNS_to_alpha(png_ptr);
goto notrans;
}
// look for bKGD chunk, and process if applicable
if(p2d->use_file_bg_flag) {
if(png_get_bKGD(png_ptr, info_ptr, &bg_colorp)) {
// process the background, store 8-bit RGB in bkgd_color
has_bkgd=1;
if(is_grayscale && png_bit_depth<8) {
bkgd_color.red =
bkgd_color.green=
bkgd_color.blue =
(unsigned char) ( (bg_colorp->gray*255)/( (1<<png_bit_depth)-1 ) );
}
else if(png_bit_depth<=8) {
bkgd_color.red=(unsigned char)(bg_colorp->red);
bkgd_color.green=(unsigned char)(bg_colorp->green);
bkgd_color.blue =(unsigned char)(bg_colorp->blue);
}
else {
bkgd_color.red=(unsigned char)(bg_colorp->red>>8);
bkgd_color.green=(unsigned char)(bg_colorp->green>>8);
bkgd_color.blue =(unsigned char)(bg_colorp->blue>>8);
}
}
}
if( !(color_type & PNG_COLOR_MASK_ALPHA) && !has_trns) {
// If no transparency, we can skip this whole background-color mess.
goto notrans;
}
if(has_bkgd && (png_bit_depth>8 || !is_grayscale || has_alpha_channel)) {
png_set_background(png_ptr, bg_colorp,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
}
else if(is_grayscale && has_trns && png_bit_depth<=8
&& (has_bkgd || (p2d->use_custom_bg_flag)) )
{
// grayscale binarytrans,<=8bpp: transparency is handle manually
// by modifying a palette entry (later)
png_get_tRNS(png_ptr,info_ptr,&trns_trans, &i, &temp_colorp);
if(i>=1) {
trns_color= temp_colorp->gray; // corresponds to a palette entry
manual_trns=1;
}
}
else if(!has_bkgd && (has_trns || has_alpha_channel) &&
(p2d->use_custom_bg_flag) )
{ // process most CUSTOM background colors
bkgd.index = 0; // unused
bkgd.red = p2d->bgcolor.red;
bkgd.green = p2d->bgcolor.green;
bkgd.blue = p2d->bgcolor.blue;
// libpng may use bkgd.gray if bkgd.red==bkgd.green==bkgd.blue.
// Not sure if that's a libpng bug or not.
bkgd.gray = p2d->bgcolor.red;
if(png_bit_depth>8) {
bkgd.red = (bkgd.red <<8)|bkgd.red;
bkgd.green= (bkgd.green<<8)|bkgd.green;
bkgd.blue = (bkgd.blue <<8)|bkgd.blue;
bkgd.gray = (bkgd.gray <<8)|bkgd.gray;
}
if(is_grayscale) {
/* assert(png_bit_depth>8); */
/* Need to expand to full RGB if unless background is pure gray */
if(bkgd.red!=bkgd.green || bkgd.red!=bkgd.blue) {
png_set_gray_to_rgb(png_ptr);
// png_set_tRNS_to_alpha() is called here because otherwise
// binary transparency for 16-bps grayscale images doesn't
// work. Libpng will think black pixels are transparent.
// I don't know exactly why it works. It does *not* add an
// alpha channel, as you might think (adding an alpha
// channnel makes no sense if you are using
// png_set_background).
//
// Here's an alternate hack that also seems to work, but
// uses direct structure access:
//
// png_ptr->trans_values.red =
// png_ptr->trans_values.green =
// png_ptr->trans_values.blue = png_ptr->trans_values.gray;
if(has_trns)
png_set_tRNS_to_alpha(png_ptr);
png_set_background(png_ptr, &bkgd,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
}
else { // gray custom background
png_set_background(png_ptr, &bkgd,
PNG_BACKGROUND_GAMMA_SCREEN, 1, 1.0);
}
}
else {
png_set_background(png_ptr, &bkgd,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
}
}
notrans:
// If we don't have any background color at all that we can use,
// strip the alpha channel.
if(!dib_alpha32 && has_alpha_channel && !has_bkgd &&
!(p2d->use_custom_bg_flag) )
{
png_set_strip_alpha(png_ptr);
}
if(png_bit_depth>8)
png_set_strip_16(png_ptr);
if (png_get_sRGB(png_ptr, info_ptr, &i)) {
has_gama=1;
file_gamma = 0.45455;
}
else if(png_get_gAMA(png_ptr, info_ptr, &file_gamma)) {
has_gama=1;
}
else {
has_gama=0;
file_gamma = 0.45455;
}
if(/*imginfo && */ has_gama) {
p2d->file_gamma=file_gamma;
p2d->gamma_returned=1;
}
manual_gamma=0;
if(p2d->gamma_correction) {
if(!is_grayscale || png_bit_depth>8 || has_alpha_channel) {
png_set_gamma(png_ptr, p2d->screen_gamma, file_gamma);
//png_ptr->transformations |= 0x2000; // hack for old libpng versions
}
else manual_gamma=1;
if(has_bkgd) {
// Gamma correct the background color (if we got it from the file)
// before returning it to the app.
gamma_correct(p2d->screen_gamma,file_gamma,&bkgd_color.red,&bkgd_color.green,&bkgd_color.blue);
}
}
png_read_update_info(png_ptr, info_ptr);
// color type may have changed, due to our transformations
color_type = png_get_color_type(png_ptr,info_ptr);
switch(color_type) {
case PNG_COLOR_TYPE_RGB_ALPHA:
assert(dib_alpha32);
dib_bpp= 32;
palette_entries=0;
png_set_bgr(png_ptr);
break;
case PNG_COLOR_TYPE_RGB:
dib_bpp= 24;
palette_entries=0;
png_set_bgr(png_ptr);
break;
case PNG_COLOR_TYPE_PALETTE:
dib_bpp=png_bit_depth;
png_get_PLTE(png_ptr,info_ptr,&png_palette,&palette_entries);
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
dib_bpp=png_bit_depth;
if(png_bit_depth>8) dib_bpp=8;
palette_entries= 1<<dib_bpp;
// we'll construct a grayscale palette later
break;
default:
rv=PNGD_E_BADPNG;
goto abort;
}
if(dib_bpp==2) dib_bpp=4;
has_phys=png_get_valid(png_ptr,info_ptr,PNG_INFO_pHYs);
if(has_phys) {
png_get_pHYs(png_ptr,info_ptr,&res_x,&res_y,&res_unit_type);
if(res_x>0 && res_y>0) {
p2d->res_x=res_x;
p2d->res_y=res_y;
p2d->res_units=res_unit_type;
p2d->res_valid=1;
}
}
// DIB scanlines are padded to 4-byte boundaries.
dib_bytesperrow= (((width * dib_bpp)+31)/32)*4;
p2d->bitssize = height*dib_bytesperrow;
p2d->dibsize=sizeof(BITMAPINFOHEADER) + 4*palette_entries +
(write_bitfields?12:0) + p2d->bitssize;;
if(p2d->common.malloc_function) {
lpdib = (unsigned char*)(*(p2d->common.malloc_function))(p2d->common.userdata,p2d->dibsize);
}
else {
lpdib = (unsigned char*)calloc(p2d->dibsize,1);
}
if(!lpdib) { rv=PNGD_E_NOMEM; goto abort; }
p2d->pdib = (LPBITMAPINFOHEADER)lpdib;
row_pointers=(unsigned char**)malloc(height*sizeof(unsigned char*));
if(!row_pointers) { rv=PNGD_E_NOMEM; goto abort; }
// there is some redundancy here...
p2d->palette_offs=sizeof(BITMAPINFOHEADER);
p2d->bits_offs =sizeof(BITMAPINFOHEADER) + 4*palette_entries + (write_bitfields?12:0);
dib_palette= &lpdib[p2d->palette_offs];
p2d->palette= (RGBQUAD*)dib_palette;
dib_bits = &lpdib[p2d->bits_offs];
p2d->pbits = (VOID*)dib_bits;
p2d->palette_colors = palette_entries;
// set up the DIB palette, if needed
switch(color_type) {
case PNG_COLOR_TYPE_PALETTE:
for(i=0;i<palette_entries;i++) {
p2d->palette[i].rgbRed = png_palette[i].red;
p2d->palette[i].rgbGreen = png_palette[i].green;
p2d->palette[i].rgbBlue = png_palette[i].blue;
}
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
for(i=0;i<palette_entries;i++) {
p2d->palette[i].rgbRed =
p2d->palette[i].rgbGreen =
p2d->palette[i].rgbBlue = (i*255)/(palette_entries-1);
if(manual_gamma) {
gamma_correct(p2d->screen_gamma,file_gamma,
&(p2d->palette[i].rgbRed),
&(p2d->palette[i].rgbGreen),
&(p2d->palette[i].rgbBlue));
}
}
if(manual_trns) {
p2d->palette[trns_color].rgbRed = bkgd_color.red;
p2d->palette[trns_color].rgbGreen = bkgd_color.green;
p2d->palette[trns_color].rgbBlue = bkgd_color.blue;
}
break;
}
// set up BITFIELDS, if needed
if(dib_alpha32) {
static const unsigned char bf_data[12] = {
0x00,0x00,0xff,0x00,
0x00,0xff,0x00,0x00,
0xff,0x00,0x00,0x00
};
for(i=0;i<12;i++) {
lpdib[p2d->palette_offs+i]=bf_data[i];
}
}
for(j=0;j<(int)height;j++) {
row_pointers[height-1-j]= &dib_bits[j*dib_bytesperrow];
}
png_read_image(png_ptr, row_pointers);
// special handling for this bit depth, since it doesn't exist in DIBs
// expand 2bpp to 4bpp
if(png_bit_depth==2) {
tmprow = (unsigned char*)malloc((width+3)/4 );
if(!tmprow) { rv=PNGD_E_NOMEM; goto abort; }
for(j=0;j<(int)height;j++) {
CopyMemory(tmprow, row_pointers[j], (width+3)/4 );
ZeroMemory(row_pointers[j], (width+1)/2 );
for(i=0;i<(int)width;i++) {
row_pointers[j][i/2] |=
( ((tmprow[i/4] >> (2*(3-i%4)) ) & 0x03)<< (4*(1-i%2)) );
}
}
free((void*)tmprow);
}
free((void*)row_pointers);
row_pointers=NULL;
png_read_end(png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
png_ptr=NULL;
if(p2d->input_method==0) {
fclose(fp);
fp=NULL;
}
// fill in the DIB header fields
p2d->pdib->biSize= sizeof(BITMAPINFOHEADER);
p2d->pdib->biWidth= width;
p2d->pdib->biHeight= height;
p2d->pdib->biPlanes= 1;
p2d->pdib->biBitCount= dib_bpp;
p2d->pdib->biCompression= write_bitfields?BI_BITFIELDS:BI_RGB;
// biSizeImage can also be 0 in uncompressed bitmaps
p2d->pdib->biSizeImage= height*dib_bytesperrow;
if(has_phys) {
if(res_unit_type==1) {
p2d->pdib->biXPelsPerMeter= res_x;
p2d->pdib->biYPelsPerMeter= res_y;
}
}
p2d->pdib->biClrUsed= palette_entries;
p2d->pdib->biClrImportant= 0;
if(has_bkgd || (p2d->use_custom_bg_flag)) {
// return the background color if one was used
p2d->bgcolor.red = bkgd_color.red;
p2d->bgcolor.green = bkgd_color.green;
p2d->bgcolor.blue = bkgd_color.blue;
p2d->bgcolor_returned=1;
}
return PNGD_E_SUCCESS;
abort:
if(png_ptr) png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
if(p2d->input_method==0 && fp) fclose(fp);
if(row_pointers) free((void*)row_pointers);
if(lpdib) {
pngdib_p2d_free_dib((PNGDIB*)p2d,NULL);
}
// If we don't have an error message yet, use a
// default one based on the code
if(!lstrlen(p2d->common.errmsg)) {
pngd_get_error_message(rv,p2d->common.errmsg);
}
return rv;
}
void PNGDIB_DECL pngdib_p2d_free_dib(PNGDIB *qq, BITMAPINFOHEADER* pdib)
{
struct p2d_struct *p2d;
if(!qq) {
if(pdib) free((void*)pdib);
return;
}
p2d=(struct p2d_struct*)qq;
if(!pdib) {
// DIB not explicitly given; use the one from the PNGDIB object.
// (this is the normal case)
pdib = p2d->pdib;
p2d->pdib = NULL;
}
if(pdib) {
if(p2d->common.free_function) {
(*(p2d->common.free_function))(p2d->common.userdata,(void*)pdib);
}
else {
free((void*)pdib);
}
}
}
int PNGDIB_DECL pngdib_d2p_run(PNGDIB *qq)
{
struct d2p_struct *d2p;
png_structp png_ptr;
png_infop info_ptr;
jmp_buf jbuf;
struct errstruct errinfo;
png_text text_ptr[1];
unsigned char *bits;
unsigned char *newimage;
RGBQUAD* dib_palette;
int headersize, dib_bpp;
int png_color_type;
png_uint_32 res_x, res_y;
png_color_8 pngc8;
int height,width;
int palette_entries;
int topdown;
int dib_bytesperrow;
int compression;
FILE *fp;
png_color png_palette[256];
unsigned char **row_pointers;
int i,x,y,size;
DWORD *bitfields;
unsigned int v;
int bf_format; // bitfields format identifier
int iscompressed;
int bfsize; // bytes in "bitfields" section
int palsize; // bytes in palette
int palentsize; // bytes in a palette entry: 3 or 4;
BITMAPCOREHEADER *lpolddib;
int rv; // return code
int dib_alpha32;
d2p=(struct d2p_struct*)qq;
rv=PNGD_E_ERROR; // this should always get changed before returning
png_ptr=NULL;
info_ptr=NULL;
fp=NULL;
row_pointers=NULL;
newimage=NULL;
dib_alpha32=0;
lstrcpy(d2p->common.errmsg,_T(""));
if(!d2p->output_filename) {
wsprintf(d2p->common.errmsg,_T("Output filename not set"));
rv=PNGD_E_ERROR; goto abort;
}
if(!d2p->pdib) {
wsprintf(d2p->common.errmsg,_T("Input DIB not set"));
rv=PNGD_E_ERROR; goto abort;
}
headersize= d2p->pdib->biSize;
if(headersize<40 && headersize!=12) {
wsprintf(d2p->common.errmsg,_T("Unexpected BMP header size (%d)"),headersize);
rv=PNGD_E_BADBMP; goto abort;
}
if(headersize==12) {
// This is to support an old kind of DIBs (OS/2) that aren't really
// used anymore.
palentsize= 3;
lpolddib= (BITMAPCOREHEADER*) d2p->pdib;
width= lpolddib->bcWidth;
height= lpolddib->bcHeight;
dib_bpp= lpolddib->bcBitCount;
compression = BI_RGB;
res_x = res_y = 0;
// This will get adjusted later if there is a palette.
// Not sure it's right, though. Do old DIBs always have a
// full-sized palette?
palette_entries=0;
}
else {
palentsize=4;
width = d2p->pdib->biWidth;
height = d2p->pdib->biHeight;
dib_bpp = d2p->pdib->biBitCount;
compression = d2p->pdib->biCompression;
res_x = d2p->pdib->biXPelsPerMeter;
res_y = d2p->pdib->biYPelsPerMeter;
palette_entries = d2p->pdib->biClrUsed;
}
// supposedly, if the height is negative, the top scanline is stored first
topdown=0;
if(height<0) {
height= -height;
topdown=1;
}
// sanity check
if(height<1 || height>1000000 || width<1 || width>1000000) {
wsprintf(d2p->common.errmsg,_T("Unreasonable image dimensions (%dx%d)"),width,height);
rv=PNGD_E_BADBMP; goto abort;
}
if(dib_bpp==32 && (d2p->common.dib_alpha32)) {
dib_alpha32=1;
}
// only certain combinations of compression and bpp are allowed
switch(compression) {
case BI_RGB:
if(dib_bpp!=1 && dib_bpp!=4 && dib_bpp!=8 && dib_bpp!=16
&& dib_bpp!=24 && dib_bpp!=32)
{
wsprintf(d2p->common.errmsg,_T("Unsupported bit depth (%d)"),dib_bpp);
rv=PNGD_E_UNSUPP; goto abort;
}
break;
case BI_RLE4:
if(dib_bpp!=4) {
rv=PNGD_E_UNSUPP; goto abort;
}
break;
case BI_RLE8:
if(dib_bpp!=8) {
rv=PNGD_E_UNSUPP; goto abort;
}
break;
case BI_BITFIELDS:
if(dib_bpp!=16 && dib_bpp!=32) {
rv=PNGD_E_UNSUPP; goto abort;
}
break;
default:
wsprintf(d2p->common.errmsg,_T("Unsupported compression scheme"));
return PNGD_E_UNSUPP;
}
iscompressed= (compression==BI_RLE4 || compression==BI_RLE8);
// uncompressed dibs are padded to 4-byte bondaries
dib_bytesperrow= (((width * dib_bpp)+31)/32)*4;
if(dib_bpp<16) {
if(palette_entries==0) palette_entries = 1<<dib_bpp;
}
bfsize = (compression==BI_BITFIELDS)?12:0;
palsize=palentsize*palette_entries;
// bounds check
size= headersize + bfsize + palsize;
if(d2p->dibsize) {
if(size>d2p->dibsize) {
rv=PNGD_E_BADBMP; goto abort;
}
}
if(d2p->pbits) {
if(d2p->bitssize && !iscompressed) { // bounds check
size=dib_bytesperrow*height;
if(size>d2p->bitssize) { rv=PNGD_E_BADBMP; goto abort; }
}
bits=(unsigned char*)d2p->pbits;
}
else {
// If not provided by user, assume the bits immediately
// follow the palette.
if(d2p->dibsize && !iscompressed) { // bounds check
size= headersize+bfsize+palsize+dib_bytesperrow*height;
if(size>d2p->dibsize) { rv=PNGD_E_BADBMP; goto abort; }
}
bits= &((unsigned char*)(d2p->pdib))[headersize+bfsize+palsize];
}
bitfields = (DWORD*) ( &((unsigned char*)(d2p->pdib))[headersize] );
dib_palette = (RGBQUAD*) ( &((unsigned char*)(d2p->pdib))[headersize+bfsize] );
bf_format=0;
if(compression==BI_BITFIELDS) {
if(dib_bpp==16) {
if (bitfields[0]==0x00007c00 && bitfields[1]==0x000003e0 &&
bitfields[2]==0x0000001f) bf_format=11; // 555
else if(bitfields[0]==0x0000f800 && bitfields[1]==0x000007e0 &&
bitfields[2]==0x0000001f) bf_format=12; // 565
else { rv=PNGD_E_UNSUPP; goto abort; }
}
if(dib_bpp==32) {
if (bitfields[0]==0x00ff0000 && bitfields[1]==0x0000ff00 &&
bitfields[2]==0x000000ff) bf_format=21;
else { rv=PNGD_E_UNSUPP; goto abort; }
}
}
if(bf_format==0 && dib_bpp==16) bf_format=10;
if(bf_format==0 && dib_bpp==32) bf_format=20;
// Done analyzing the DIB, now time to convert it to PNG
// FIXME: this probably isn't quite right
// jbuf: see comments in read_png_to_dib()
errinfo.jbufp = &jbuf;
errinfo.errmsg = d2p->common.errmsg;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (void*)(&errinfo),
my_png_error_fn, my_png_warning_fn);
if (!png_ptr) { rv=PNGD_E_NOMEM; goto abort; }
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
//png_destroy_write_struct(&png_ptr,(png_infopp)NULL);
rv=PNGD_E_NOMEM; goto abort;
}
if(setjmp(jbuf)) {
// we'll get here if an error occurred in any of the following
// png_ functions
rv=PNGD_E_LIBPNG;
goto abort;
}
fp= _tfopen(d2p->output_filename,_T("wb"));
if(!fp) {
rv=PNGD_E_WRITE;
goto abort;
}
png_init_io(png_ptr, fp);
if(dib_alpha32) {
png_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
else {
png_color_type = (dib_bpp>8)?PNG_COLOR_TYPE_RGB:PNG_COLOR_TYPE_PALETTE;
}
png_set_IHDR(png_ptr, info_ptr, width, height, (dib_bpp>8)?8:dib_bpp,
png_color_type,
(d2p->interlaced)?PNG_INTERLACE_ADAM7:PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
// write sRGB and gAMA chunks
if(d2p->file_gamma_valid) {
if(d2p->file_gamma>0.454539 && d2p->file_gamma<0.454551) {
png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_RELATIVE);
}
png_set_gAMA(png_ptr, info_ptr, d2p->file_gamma);
}
// For 16-bit DIBs, we get to write an sBIT chunk.
if(bf_format==10 || bf_format==11) {
pngc8.red= 5; pngc8.green= 5; pngc8.blue= 5;
png_set_sBIT(png_ptr, info_ptr, &pngc8);
}
if(bf_format==12) {
pngc8.red= 5; pngc8.green= 6; pngc8.blue= 5;
png_set_sBIT(png_ptr, info_ptr, &pngc8);
}
// pHYs
if(res_x>0 && res_y>0)
png_set_pHYs(png_ptr, info_ptr, res_x, res_y, 1);
if(palette_entries>0) {
for(i=0;i<palette_entries;i++) {
if(palentsize==3) {
png_palette[i].red = ((RGBTRIPLE*)dib_palette)[i].rgbtRed;
png_palette[i].green = ((RGBTRIPLE*)dib_palette)[i].rgbtGreen;
png_palette[i].blue = ((RGBTRIPLE*)dib_palette)[i].rgbtBlue;
}
else {
png_palette[i].red = dib_palette[i].rgbRed;
png_palette[i].green = dib_palette[i].rgbGreen;
png_palette[i].blue = dib_palette[i].rgbBlue;
}
}
png_set_PLTE(png_ptr, info_ptr, png_palette, palette_entries);
}
if(dib_bpp>8)
png_set_bgr(png_ptr);
png_write_info(png_ptr, info_ptr);
row_pointers=(unsigned char**)malloc(height*sizeof(unsigned char*));
if(!row_pointers) { rv=PNGD_E_NOMEM; goto abort; }
if(dib_bpp==16 || (dib_bpp==32 && !dib_alpha32)) {
// Special handling for these bit depths.
// This uses a lot of memory, and could be improved by processing
// one line at a time (but that makes it tricky to write interlaced
// images).
newimage=(unsigned char*)malloc(height*width*3);
if(!newimage) { rv=PNGD_E_NOMEM; goto abort; }
for(y=0;y<height;y++) {
for(x=0;x<width;x++) {
switch(bf_format) {
case 10: case 11: // 16-bit, format 555 (xRRRRRGG GGGBBBBB)
v= bits[y*dib_bytesperrow+x*2+0] | (bits[y*dib_bytesperrow+x*2+1]<<8);
newimage[(y*width+x)*3+0]= (v & 0x0000001f)<<3 | (v & 0x0000001f)>>2; // blue
newimage[(y*width+x)*3+1]= (v & 0x000003e0)>>2 | (v & 0x000003e0)>>7; // green
newimage[(y*width+x)*3+2]= (v & 0x00007c00)>>7 | (v & 0x00007c00)>>12; // red
break;
case 12: // 16-bit, format 565 (RRRRRGGG GGGBBBBB)
v= bits[y*dib_bytesperrow+x*2+0] | (bits[y*dib_bytesperrow+x*2+1]<<8);
newimage[(y*width+x)*3+0]= (v & 0x0000001f)<<3 | (v & 0x0000001f)>>2; // blue
newimage[(y*width+x)*3+1]= (v & 0x000007e0)>>3 | (v & 0x000007e0)>>9; // green
newimage[(y*width+x)*3+2]= (v & 0x0000f800)>>8 | (v & 0x0000f800)>>13; // red
break;
case 20: case 21: // 32-bit, every 4th byte wasted (b g r x)
newimage[(y*width+x)*3+0]= bits[y*dib_bytesperrow+x*4+0]; // blue
newimage[(y*width+x)*3+1]= bits[y*dib_bytesperrow+x*4+1]; // green
newimage[(y*width+x)*3+2]= bits[y*dib_bytesperrow+x*4+2]; // red
break;
}
}
}
for(i=0;i<height;i++) {
if(topdown)
row_pointers[i]= &newimage[i*width*3];
else
row_pointers[height-1-i]= &newimage[i*width*3];
}
png_write_image(png_ptr, row_pointers);
free(newimage);
newimage=NULL;
}
else if(iscompressed) {
newimage= uncompress_dib((LPBITMAPINFO)d2p->pdib, headersize+bfsize+palsize, bits);
if(!newimage) { rv=PNGD_E_NOMEM; goto abort; }
for(i=0;i<height;i++) {
if(topdown)
row_pointers[i]= &newimage[i*dib_bytesperrow];
else
row_pointers[height-1-i]= &newimage[i*dib_bytesperrow];
}
png_write_image(png_ptr, row_pointers);
free(newimage);
newimage=NULL;
}
else {
for(i=0;i<height;i++) {
if(topdown)
row_pointers[i]= &bits[i*dib_bytesperrow];
else
row_pointers[height-1-i]= &bits[i*dib_bytesperrow];
}
png_write_image(png_ptr, row_pointers);
}
free((VOID*)row_pointers);
row_pointers=NULL;
if(d2p->software_id_string) {
text_ptr[0].key = "Software";
text_ptr[0].text = d2p->software_id_string;
text_ptr[0].compression = PNG_TEXT_COMPRESSION_NONE;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
}
png_write_end(png_ptr, info_ptr);
rv=PNGD_E_SUCCESS;
abort:
if(png_ptr) png_destroy_write_struct(&png_ptr, &info_ptr);
if(fp) fclose(fp);
if(row_pointers) free(row_pointers);
if(newimage) free(newimage);
// If we don't have an error message yet, use a
// default one based on the code
if(!lstrlen(d2p->common.errmsg)) {
pngd_get_error_message(rv,d2p->common.errmsg);
}
return rv;
}
TCHAR* PNGDIB_DECL pngdib_get_version_string(void)
{
return PNGDIB_SRC_VERSION_STRING;
}
int PNGDIB_DECL pngdib_get_version(void)
{
return PNGDIB_SRC_VERSION;
}
PNGDIB* PNGDIB_DECL _pngdib_init(int structtype, int caller_header_vers)
{
PNGDIB *qq = NULL;
if(structtype==PNGD_ST_D2P) {
struct d2p_struct *d2p;
d2p = (struct d2p_struct *)calloc(sizeof(struct d2p_struct),1);
if(d2p) {
d2p->common.structtype = PNGD_ST_D2P;
d2p->file_gamma_valid = 1;
d2p->file_gamma = PNGDIB_DEFAULT_FILE_GAMMA;
}
qq=(PNGDIB*)d2p;
}
else if(structtype==PNGD_ST_P2D) {
struct p2d_struct *p2d;
p2d = (struct p2d_struct *)calloc(sizeof(struct p2d_struct),1);
if(p2d) {
p2d->common.structtype = PNGD_ST_P2D;
}
qq=(PNGDIB*)p2d;
}
// initialize common fields:
if(qq) {
qq->errmsg = calloc(PNGDIB_ERRMSG_MAX,sizeof(TCHAR));
}
return qq;
}
int PNGDIB_DECL pngdib_d2p_set_dib(PNGDIB *qq,
const BITMAPINFOHEADER* lpdib, int dibsize,
const void* lpbits, int bitssize)
{
struct d2p_struct *d2p;
if(qq->structtype!=PNGD_ST_D2P) return 0;
d2p=(struct d2p_struct*)qq;
d2p->pdib = lpdib;
d2p->dibsize = dibsize;
d2p->pbits = lpbits;
d2p->bitssize = bitssize;
return 1;
}
void PNGDIB_DECL pngdib_d2p_set_interlace(PNGDIB *qq, int interlaced)
{
struct d2p_struct *d2p;
d2p=(struct d2p_struct*)qq;
d2p->interlaced = interlaced;
}
int PNGDIB_DECL pngdib_d2p_set_png_filename(PNGDIB *qq, const TCHAR *fn)
{
struct d2p_struct *d2p;
d2p=(struct d2p_struct*)qq;
d2p->output_filename = _tcsdup(fn);
return (d2p->output_filename)?1:0;
}
int PNGDIB_DECL pngdib_d2p_set_software_id(PNGDIB *qq, const TCHAR *s)
{
struct d2p_struct *d2p;
int len;
d2p=(struct d2p_struct*)qq;
len= lstrlen(s);
// The software id is never stored as UNICODE.
#ifdef _UNICODE
d2p->software_id_string = calloc(len+10,1);
_snprintf(d2p->software_id_string,len+10,"%S",s);
#else
d2p->software_id_string = _strdup(s);
#endif
return (d2p->output_filename)?1:0;
}
void PNGDIB_DECL pngdib_d2p_set_gamma_label(PNGDIB *qq, int flag, double file_gamma)
{
struct d2p_struct *d2p;
d2p=(struct d2p_struct*)qq;
d2p->file_gamma_valid = flag;
d2p->file_gamma = file_gamma;
}
int PNGDIB_DECL pngdib_done(PNGDIB *qq)
{
struct d2p_struct *d2p;
struct p2d_struct *p2d;
if(!qq) return 0;
if(qq->errmsg) free(qq->errmsg);
switch(qq->structtype) {
case PNGD_ST_D2P:
d2p=(struct d2p_struct*)qq;
if(d2p->output_filename) free(d2p->output_filename);
if(d2p->software_id_string) free(d2p->software_id_string);
free(d2p);
return 1;
case PNGD_ST_P2D:
p2d=(struct p2d_struct*)qq;
if(p2d->input_filename) free(p2d->input_filename);
free(p2d);
return 1;
}
return 0;
}
void PNGDIB_DECL pngdib_setcallback_malloc(PNGDIB *qq,
pngdib_malloc_cb_type mallocfunc,
pngdib_free_cb_type freefunc,
pngdib_realloc_cb_type reallocfunc)
{
qq->malloc_function = mallocfunc;
qq->free_function = freefunc;
qq->realloc_function = reallocfunc;
}
TCHAR* PNGDIB_DECL pngdib_get_error_msg(PNGDIB *qq)
{
return qq->errmsg;
}
void PNGDIB_DECL pngdib_set_userdata(PNGDIB* qq, void* userdata)
{
qq->userdata = userdata;
}
void* PNGDIB_DECL pngdib_get_userdata(PNGDIB* qq)
{
return qq->userdata;
}
int PNGDIB_DECL pngdib_p2d_set_png_filename(PNGDIB *qq, const TCHAR *fn)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
p2d->input_filename = _tcsdup(fn);
p2d->input_method = 0;
return (p2d->input_filename)?1:0;
}
void PNGDIB_DECL pngdib_p2d_set_png_memblk(PNGDIB *qq, const void *mem, int memsize)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
p2d->input_memblk = (unsigned char*)mem;
p2d->input_method = 1;
if(memsize>=0)
p2d->input_memblk_size = memsize;
}
void PNGDIB_DECL pngdib_p2d_set_use_file_bg(PNGDIB *qq, int flag)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
p2d->use_file_bg_flag = flag;
}
void PNGDIB_DECL pngdib_p2d_set_custom_bg(PNGDIB *qq, unsigned char r,
unsigned char g, unsigned char b)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
p2d->bgcolor.red = r;
p2d->bgcolor.green = g;
p2d->bgcolor.blue = b;
p2d->use_custom_bg_flag = 1;
}
void PNGDIB_DECL pngdib_p2d_set_gamma_correction(PNGDIB *qq, int flag, double screen_gamma)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
p2d->screen_gamma = screen_gamma;
p2d->gamma_correction = flag;
}
int PNGDIB_DECL pngdib_p2d_get_dib(PNGDIB *qq,
BITMAPINFOHEADER **ppdib, int *pdibsize)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
*ppdib = p2d->pdib;
if(pdibsize) *pdibsize = p2d->dibsize;
return 1;
}
int PNGDIB_DECL pngdib_p2d_get_dibbits(PNGDIB *qq, void **ppbits, int *pbitsoffset, int *pbitssize)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
*ppbits = p2d->pbits;
if(pbitsoffset) *pbitsoffset = p2d->bits_offs;
if(pbitssize) *pbitssize = p2d->bitssize;
return 1;
}
int PNGDIB_DECL pngdib_p2d_get_palette(PNGDIB *qq, RGBQUAD **ppal, int *ppaloffset, int *ppalnumcolors)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
if(ppal) *ppal = p2d->palette;
if(ppaloffset) *ppaloffset = p2d->palette_offs;
if(ppalnumcolors) *ppalnumcolors = p2d->palette_colors;
return 1;
}
int PNGDIB_DECL pngdib_p2d_get_colortype(PNGDIB *qq)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
return p2d->color_type;
}
int PNGDIB_DECL pngdib_p2d_get_bitspersample(PNGDIB *qq)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
return p2d->bits_per_sample;
}
int PNGDIB_DECL pngdib_p2d_get_bitsperpixel(PNGDIB *qq)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
return p2d->bits_per_pixel;
}
int PNGDIB_DECL pngdib_p2d_get_samplesperpixel(PNGDIB *qq)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
return p2d->bits_per_pixel/p2d->bits_per_sample;
}
int PNGDIB_DECL pngdib_p2d_get_interlace(PNGDIB *qq)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
return p2d->interlace;
}
int PNGDIB_DECL pngdib_p2d_get_density(PNGDIB *qq, int *pres_x, int *pres_y, int *pres_units)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
if(p2d->res_valid) {
*pres_x = p2d->res_x;
*pres_y = p2d->res_y;
*pres_units = p2d->res_units;
return 1;
}
*pres_x = 1;
*pres_y = 1;
*pres_units = 0;
return 0;
}
int PNGDIB_DECL pngdib_p2d_get_file_gamma(PNGDIB *qq, double *pgamma)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
if(p2d->gamma_returned) {
*pgamma = p2d->file_gamma;
return 1;
}
return 0;
}
int PNGDIB_DECL pngdib_p2d_get_bgcolor(PNGDIB *qq, unsigned char *pr, unsigned char *pg, unsigned char *pb)
{
struct p2d_struct *p2d;
p2d=(struct p2d_struct*)qq;
if(p2d->bgcolor_returned) {
*pr = p2d->bgcolor.red;
*pg = p2d->bgcolor.green;
*pb = p2d->bgcolor.blue;
return 1;
}
return 0;
}
void PNGDIB_DECL pngdib_set_dibalpha32(PNGDIB *qq, int flag)
{
qq->dib_alpha32 = flag;
}
////////////////////////////////////
////////////////////////////////////
#if PNGDIB_V2COMPATIBLE
static void* PNGDIB_DECL globalalloc_callback(void *userdata, int memblksize)
{
return (void*)GlobalAlloc(GPTR,memblksize);
}
static void PNGDIB_DECL globalfree_callback(void *userdata, void *memblk)
{
GlobalFree((HGLOBAL)memblk);
}
static void* PNGDIB_DECL heapalloc_callback(void *userdata, int memblksize)
{
return HeapAlloc((HANDLE)userdata,HEAP_ZERO_MEMORY,memblksize);
}
static void PNGDIB_DECL heapfree_callback(void *userdata, void *memblk)
{
HeapFree((HANDLE)userdata,0,memblk);
}
int read_png_to_dib(PNGD_P2DINFO *p2dp)
{
PNGDIB *qq;
int errcode;
char *msg;
HANDLE heap;
int use_heapalloc;
int imginfo;
imginfo=0;
use_heapalloc=0;
qq=pngdib_p2d_init();
if(!qq) return PNGD_E_NOMEM;
// fields through errmsg must exist
if(p2dp->structsize<48) return PNGD_E_VERSION;
// try to be somewhat backward-compatible
if(p2dp->structsize>=88) {
imginfo=1;
}
if(p2dp->structsize>=96) {
if(p2dp->flags & PNGD_USE_HEAPALLOC) {
use_heapalloc=1;
heap = p2dp->heap;
if(!heap) heap = GetProcessHeap();
}
}
if(use_heapalloc) {
pngdib_set_userdata(qq,(void*)heap);
pngdib_setcallback_malloc(qq,heapalloc_callback,heapfree_callback,NULL);
}
else {
pngdib_setcallback_malloc(qq,globalalloc_callback,globalfree_callback,NULL);
}
pngdib_p2d_set_png_filename(qq,p2dp->pngfn);
pngdib_p2d_set_gamma_correction(qq,(p2dp->flags&PNGD_GAMMA_CORRECTION)?1:0,PNGDIB_DEFAULT_SCREEN_GAMMA);
if(p2dp->flags&PNGD_USE_BKGD)
pngdib_p2d_set_use_file_bg(qq,1);
if(p2dp->flags&PNGD_USE_CUSTOM_BG) {
pngdib_p2d_set_custom_bg(qq,p2dp->bgcolor.red,
p2dp->bgcolor.green,p2dp->bgcolor.blue);
}
if(p2dp->flags&PNGD_DIB_ALPHA32)
pngdib_set_dibalpha32(qq,1);
errcode=pngdib_p2d_run(qq);
if(!errcode) {
pngdib_p2d_get_dib(qq,&p2dp->lpdib, &p2dp->dibsize);
pngdib_p2d_get_dibbits(qq,&p2dp->lpbits, &p2dp->bits_offs, NULL);
pngdib_p2d_get_palette(qq,&p2dp->palette, &p2dp->palette_offs, &p2dp->palette_colors);
if(imginfo) {
p2dp->color_type = pngdib_p2d_get_colortype(qq);
p2dp->bits_per_sample = pngdib_p2d_get_bitspersample(qq);
p2dp->interlace = pngdib_p2d_get_interlace(qq);
p2dp->bits_per_pixel = pngdib_p2d_get_bitsperpixel(qq);
if(pngdib_p2d_get_file_gamma(qq, &p2dp->file_gamma)) {
p2dp->flags |= PNGD_GAMMA_RETURNED;
}
if(pngdib_p2d_get_density(qq, &p2dp->res_x, &p2dp->res_y, &p2dp->res_units)) {
p2dp->flags |= PNGD_RES_RETURNED;
}
if(pngdib_p2d_get_bgcolor(qq, &p2dp->bgcolor.red, &p2dp->bgcolor.green,
&p2dp->bgcolor.blue))
{
p2dp->flags |= PNGD_BG_RETURNED;
}
}
}
if(p2dp->errmsg) {
msg=pngdib_get_error_msg(qq);
lstrcpyn(p2dp->errmsg,msg,100);
}
pngdib_done(qq);
return errcode;
}
int write_dib_to_png(PNGD_D2PINFO *d2pp)
{
PNGDIB *qq;
int errcode;
char *msg;
if(d2pp->structsize != sizeof(PNGD_D2PINFO)) return PNGD_E_VERSION;
qq=pngdib_d2p_init();
if(!qq) return PNGD_E_NOMEM;
pngdib_d2p_set_dib(qq,d2pp->lpdib,d2pp->dibsize,
d2pp->lpbits,d2pp->bitssize);
if(d2pp->flags&PNGD_INTERLACED)
pngdib_d2p_set_interlace(qq,1);
if(d2pp->flags&PNGD_NO_GAMMA_LABEL)
pngdib_d2p_set_gamma_label(qq,0,0.0);
else
pngdib_d2p_set_gamma_label(qq,1,PNGDIB_DEFAULT_FILE_GAMMA);
pngdib_d2p_set_png_filename(qq,d2pp->pngfn);
if(d2pp->software)
pngdib_d2p_set_software_id(qq, d2pp->software);
if(d2pp->flags&PNGD_DIB_ALPHA32)
pngdib_set_dibalpha32(qq,1);
errcode=pngdib_d2p_run(qq);
if(d2pp->errmsg) {
msg=pngdib_get_error_msg(qq);
lstrcpyn(d2pp->errmsg,msg,100);
}
pngdib_done(qq);
return errcode;
}
#endif // PNGDIB_V2COMPATIBLE
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