1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
|
/**
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* $Id$
*/
#include "png.h"
#ifdef WIN32
#include "BLI_winstuff.h"
#endif
#include "BLI_blenlib.h"
#include "imbuf.h"
#include "imbuf_patch.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_allocimbuf.h"
#include "IMB_cmap.h"
#include "IMB_png.h"
typedef struct PNGReadStruct {
unsigned char *data;
unsigned int size;
unsigned int seek;
}PNGReadStruct;
static void ReadData( png_structp png_ptr, png_bytep data, png_size_t length);
static void WriteData( png_structp png_ptr, png_bytep data, png_size_t length);
static void Flush( png_structp png_ptr);
int imb_is_a_png(void *mem)
{
int ret_val = 0;
if (mem) {
ret_val = !png_sig_cmp(mem, 0, 8);
}
return(ret_val);
}
static void Flush(png_structp png_ptr)
{
}
static void WriteData( png_structp png_ptr, png_bytep data, png_size_t length)
{
ImBuf *ibuf = (ImBuf *) png_get_io_ptr(png_ptr);
// if buffer is to small increase it.
while (ibuf->encodedsize + length > ibuf->encodedbuffersize) {
imb_enlargeencodedbufferImBuf(ibuf);
}
memcpy(ibuf->encodedbuffer + ibuf->encodedsize, data, length);
ibuf->encodedsize += length;
}
static void ReadData( png_structp png_ptr, png_bytep data, png_size_t length)
{
PNGReadStruct *rs= (PNGReadStruct *) png_get_io_ptr(png_ptr);
if (rs) {
if (length <= rs->size - rs->seek) {
memcpy(data, rs->data + rs->seek, length);
rs->seek += length;
return;
}
}
printf("Reached EOF while decoding PNG\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
short imb_savepng(struct ImBuf *ibuf, char *name, int flags)
{
png_structp png_ptr;
png_infop info_ptr;
unsigned char *pixels = 0;
unsigned char *from, *to;
png_bytepp row_pointers = 0;
int i, bytesperpixel, color_type = PNG_COLOR_TYPE_GRAY;
FILE *fp = 0;
bytesperpixel = (ibuf->depth + 7) >> 3;
if ((bytesperpixel > 4) || (bytesperpixel == 2)) {
printf("imb_savepng: unsupported bytes per pixel: %d\n", bytesperpixel);
return (0);
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL) {
printf("Cannot png_create_write_struct\n");
return 0;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
printf("Cannot png_create_info_struct\n");
return 0;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
if (pixels) MEM_freeN(pixels);
if (row_pointers) MEM_freeN(row_pointers);
// printf("Aborting\n");
if (fp) {
fflush(fp);
fclose(fp);
}
return 0;
}
// copy image data
pixels = MEM_mallocN(ibuf->x * ibuf->y * bytesperpixel * sizeof(unsigned char), "pixels");
if (pixels == NULL) {
printf("Cannot allocate pixels array\n");
return 0;
}
from = (unsigned char *) ibuf->rect;
to = pixels;
switch (bytesperpixel) {
case 4:
color_type = PNG_COLOR_TYPE_RGBA;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = from[3];
to += 4; from += 4;
}
break;
case 3:
color_type = PNG_COLOR_TYPE_RGB;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to += 3; from += 4;
}
break;
case 1:
color_type = PNG_COLOR_TYPE_GRAY;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to++; from += 4;
}
break;
}
if (flags & IB_mem) {
// create image in memory
imb_addencodedbufferImBuf(ibuf);
ibuf->encodedsize = 0;
png_set_write_fn(png_ptr,
(png_voidp) ibuf,
WriteData,
Flush);
} else {
fp = fopen(name, "wb");
png_init_io(png_ptr, fp);
}
/*
png_set_filter(png_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE |
PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB |
PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG |
PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
PNG_ALL_FILTERS);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
*/
// png image settings
png_set_IHDR(png_ptr,
info_ptr,
ibuf->x,
ibuf->y,
8,
color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
// write the file header information
png_write_info(png_ptr, info_ptr);
// allocate memory for an array of row-pointers
row_pointers = (png_bytepp) MEM_mallocN(ibuf->y * sizeof(png_bytep), "row_pointers");
if (row_pointers == NULL) {
printf("Cannot allocate row-pointers array\n");
return 0;
}
// set the individual row-pointers to point at the correct offsets
for (i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y-1-i] = (png_bytep)
((unsigned char *)pixels + (i * ibuf->x) * bytesperpixel * sizeof(unsigned char));
}
// write out the entire image data in one call
png_write_image(png_ptr, row_pointers);
// write the additional chunks to the PNG file (not really needed)
png_write_end(png_ptr, info_ptr);
// clean up
MEM_freeN(pixels);
MEM_freeN(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
if (fp) {
fflush(fp);
fclose(fp);
}
return(1);
}
struct ImBuf *imb_loadpng(unsigned char *mem, int size, int flags)
{
struct ImBuf *ibuf = 0;
png_structp png_ptr;
png_infop info_ptr;
unsigned char *pixels = 0;
png_bytepp row_pointers = 0;
png_uint_32 width, height;
int bit_depth, color_type;
PNGReadStruct ps;
unsigned char *from, *to;
int i, bytesperpixel;
if (imb_is_a_png(mem) == 0) return(0);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL) {
printf("Cannot png_create_read_struct\n");
return 0;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, (png_infopp)NULL,
(png_infopp)NULL);
printf("Cannot png_create_info_struct\n");
return 0;
}
ps.size = size;
ps.data = mem;
ps.seek = 0;
png_set_read_fn(png_ptr, (void *) &ps, ReadData);
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
if (pixels) MEM_freeN(pixels);
if (row_pointers) MEM_freeN(row_pointers);
if (ibuf) IMB_freeImBuf(ibuf);
return 0;
}
// png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, NULL, NULL, NULL);
if (bit_depth == 16) {
png_set_strip_16(png_ptr);
bit_depth = 8;
}
bytesperpixel = png_get_channels(png_ptr, info_ptr);
switch(color_type) {
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
break;
case PNG_COLOR_TYPE_PALETTE:
png_set_palette_to_rgb(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
bytesperpixel = 4;
} else {
bytesperpixel = 3;
}
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
if (bit_depth < 8) {
png_set_expand(png_ptr);
bit_depth = 8;
}
break;
default:
printf("PNG format not supported\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
ibuf = IMB_allocImBuf(width, height, 8 * bytesperpixel, 0, 0);
if (ibuf) {
ibuf->ftype = PNG;
} else {
printf("Couldn't allocate memory for PNG image\n");
}
if (ibuf && ((flags & IB_test) == 0)) {
imb_addrectImBuf(ibuf);
pixels = MEM_mallocN(ibuf->x * ibuf->y * bytesperpixel * sizeof(unsigned char), "pixels");
if (pixels == NULL) {
printf("Cannot allocate pixels array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
// allocate memory for an array of row-pointers
row_pointers = (png_bytepp) MEM_mallocN(ibuf->y * sizeof(png_bytep), "row_pointers");
if (row_pointers == NULL) {
printf("Cannot allocate row-pointers array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
// set the individual row-pointers to point at the correct offsets
for (i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y-1-i] = (png_bytep)
((unsigned char *)pixels + (i * ibuf->x) * bytesperpixel * sizeof(unsigned char));
}
png_read_image(png_ptr, row_pointers);
// copy image data
to = (unsigned char *) ibuf->rect;
from = pixels;
switch (bytesperpixel) {
case 4:
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = from[3];
to += 4; from += 4;
}
break;
case 3:
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = 0xff;
to += 4; from += 3;
}
break;
case 2:
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = to[1] = to[2] = from[0];
to[3] = from[1];
to += 4; from += 2;
}
break;
case 1:
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = to[1] = to[2] = from[0];
to[3] = 0xff;
to += 4; from++;
}
break;
}
png_read_end(png_ptr, info_ptr);
}
// clean up
MEM_freeN(pixels);
MEM_freeN(row_pointers);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
return(ibuf);
}
|