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1
2/* pngset.c - storage of image information into info struct
3 *
4 * libpng 1.2.5rc3 - September 18, 2002
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2002 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * The functions here are used during reads to store data from the file
11 * into the info struct, and during writes to store application data
12 * into the info struct for writing into the file. This abstracts the
13 * info struct and allows us to change the structure in the future.
14 */
15
16#define PNG_INTERNAL
17#include "png.h"
18
19#if defined(PNG_bKGD_SUPPORTED)
20void PNGAPI
21png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
22{
23 png_debug1(1, "in %s storage function\n", "bKGD");
24 if (png_ptr == NULL || info_ptr == NULL)
25 return;
26
27 png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
28 info_ptr->valid |= PNG_INFO_bKGD;
29}
30#endif
31
32#if defined(PNG_cHRM_SUPPORTED)
33#ifdef PNG_FLOATING_POINT_SUPPORTED
34void PNGAPI
35png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
36 double white_x, double white_y, double red_x, double red_y,
37 double green_x, double green_y, double blue_x, double blue_y)
38{
39 png_debug1(1, "in %s storage function\n", "cHRM");
40 if (png_ptr == NULL || info_ptr == NULL)
41 return;
42
43 if (white_x < 0.0 || white_y < 0.0 ||
44 red_x < 0.0 || red_y < 0.0 ||
45 green_x < 0.0 || green_y < 0.0 ||
46 blue_x < 0.0 || blue_y < 0.0)
47 {
48 png_warning(png_ptr,
49 "Ignoring attempt to set negative chromaticity value");
50 return;
51 }
52 if (white_x > 21474.83 || white_y > 21474.83 ||
53 red_x > 21474.83 || red_y > 21474.83 ||
54 green_x > 21474.83 || green_y > 21474.83 ||
55 blue_x > 21474.83 || blue_y > 21474.83)
56 {
57 png_warning(png_ptr,
58 "Ignoring attempt to set chromaticity value exceeding 21474.83");
59 return;
60 }
61
62 info_ptr->x_white = (float)white_x;
63 info_ptr->y_white = (float)white_y;
64 info_ptr->x_red = (float)red_x;
65 info_ptr->y_red = (float)red_y;
66 info_ptr->x_green = (float)green_x;
67 info_ptr->y_green = (float)green_y;
68 info_ptr->x_blue = (float)blue_x;
69 info_ptr->y_blue = (float)blue_y;
70#ifdef PNG_FIXED_POINT_SUPPORTED
71 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
72 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
73 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
74 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
75 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
76 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
77 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
78 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
79#endif
80 info_ptr->valid |= PNG_INFO_cHRM;
81}
82#endif
83#ifdef PNG_FIXED_POINT_SUPPORTED
84void PNGAPI
85png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
86 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
87 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
88 png_fixed_point blue_x, png_fixed_point blue_y)
89{
90 png_debug1(1, "in %s storage function\n", "cHRM");
91 if (png_ptr == NULL || info_ptr == NULL)
92 return;
93
94 if (white_x < 0 || white_y < 0 ||
95 red_x < 0 || red_y < 0 ||
96 green_x < 0 || green_y < 0 ||
97 blue_x < 0 || blue_y < 0)
98 {
99 png_warning(png_ptr,
100 "Ignoring attempt to set negative chromaticity value");
101 return;
102 }
103 if (white_x > (double) PNG_MAX_UINT || white_y > (double) PNG_MAX_UINT ||
104 red_x > (double) PNG_MAX_UINT || red_y > (double) PNG_MAX_UINT ||
105 green_x > (double) PNG_MAX_UINT || green_y > (double) PNG_MAX_UINT ||
106 blue_x > (double) PNG_MAX_UINT || blue_y > (double) PNG_MAX_UINT)
107 {
108 png_warning(png_ptr,
109 "Ignoring attempt to set chromaticity value exceeding 21474.83");
110 return;
111 }
112 info_ptr->int_x_white = white_x;
113 info_ptr->int_y_white = white_y;
114 info_ptr->int_x_red = red_x;
115 info_ptr->int_y_red = red_y;
116 info_ptr->int_x_green = green_x;
117 info_ptr->int_y_green = green_y;
118 info_ptr->int_x_blue = blue_x;
119 info_ptr->int_y_blue = blue_y;
120#ifdef PNG_FLOATING_POINT_SUPPORTED
121 info_ptr->x_white = (float)(white_x/100000.);
122 info_ptr->y_white = (float)(white_y/100000.);
123 info_ptr->x_red = (float)( red_x/100000.);
124 info_ptr->y_red = (float)( red_y/100000.);
125 info_ptr->x_green = (float)(green_x/100000.);
126 info_ptr->y_green = (float)(green_y/100000.);
127 info_ptr->x_blue = (float)( blue_x/100000.);
128 info_ptr->y_blue = (float)( blue_y/100000.);
129#endif
130 info_ptr->valid |= PNG_INFO_cHRM;
131}
132#endif
133#endif
134
135#if defined(PNG_gAMA_SUPPORTED)
136#ifdef PNG_FLOATING_POINT_SUPPORTED
137void PNGAPI
138png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
139{
140 double gamma;
141 png_debug1(1, "in %s storage function\n", "gAMA");
142 if (png_ptr == NULL || info_ptr == NULL)
143 return;
144
145 /* Check for overflow */
146 if (file_gamma > 21474.83)
147 {
148 png_warning(png_ptr, "Limiting gamma to 21474.83");
149 gamma=21474.83;
150 }
151 else
152 gamma=file_gamma;
153 info_ptr->gamma = (float)gamma;
154#ifdef PNG_FIXED_POINT_SUPPORTED
155 info_ptr->int_gamma = (int)(gamma*100000.+.5);
156#endif
157 info_ptr->valid |= PNG_INFO_gAMA;
158 if(gamma == 0.0)
159 png_warning(png_ptr, "Setting gamma=0");
160}
161#endif
162void PNGAPI
163png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
164 int_gamma)
165{
166 png_fixed_point gamma;
167
168 png_debug1(1, "in %s storage function\n", "gAMA");
169 if (png_ptr == NULL || info_ptr == NULL)
170 return;
171
172 if (int_gamma > (png_fixed_point) PNG_MAX_UINT)
173 {
174 png_warning(png_ptr, "Limiting gamma to 21474.83");
175 gamma=PNG_MAX_UINT;
176 }
177 else
178 {
179 if (int_gamma < 0)
180 {
181 png_warning(png_ptr, "Setting negative gamma to zero");
182 gamma=0;
183 }
184 else
185 gamma=int_gamma;
186 }
187#ifdef PNG_FLOATING_POINT_SUPPORTED
188 info_ptr->gamma = (float)(gamma/100000.);
189#endif
190#ifdef PNG_FIXED_POINT_SUPPORTED
191 info_ptr->int_gamma = gamma;
192#endif
193 info_ptr->valid |= PNG_INFO_gAMA;
194 if(gamma == 0)
195 png_warning(png_ptr, "Setting gamma=0");
196}
197#endif
198
199#if defined(PNG_hIST_SUPPORTED)
200void PNGAPI
201png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
202{
203 int i;
204
205 png_debug1(1, "in %s storage function\n", "hIST");
206 if (png_ptr == NULL || info_ptr == NULL)
207 return;
208 if (info_ptr->num_palette == 0)
209 {
210 png_warning(png_ptr,
211 "Palette size 0, hIST allocation skipped.");
212 return;
213 }
214
215#ifdef PNG_FREE_ME_SUPPORTED
216 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
217#endif
218 /* Changed from info->num_palette to 256 in version 1.2.1 */
219 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
220 (png_uint_32)(256 * sizeof (png_uint_16)));
221 if (png_ptr->hist == NULL)
222 {
223 png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
224 return;
225 }
226
227 for (i = 0; i < info_ptr->num_palette; i++)
228 png_ptr->hist[i] = hist[i];
229 info_ptr->hist = png_ptr->hist;
230 info_ptr->valid |= PNG_INFO_hIST;
231
232#ifdef PNG_FREE_ME_SUPPORTED
233 info_ptr->free_me |= PNG_FREE_HIST;
234#else
235 png_ptr->flags |= PNG_FLAG_FREE_HIST;
236#endif
237}
238#endif
239
240void PNGAPI
241png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
242 png_uint_32 width, png_uint_32 height, int bit_depth,
243 int color_type, int interlace_type, int compression_type,
244 int filter_type)
245{
246 int rowbytes_per_pixel;
247 png_debug1(1, "in %s storage function\n", "IHDR");
248 if (png_ptr == NULL || info_ptr == NULL)
249 return;
250
251 /* check for width and height valid values */
252 if (width == 0 || height == 0)
253 png_error(png_ptr, "Image width or height is zero in IHDR");
254 if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
255 png_error(png_ptr, "Invalid image size in IHDR");
256
257 /* check other values */
258 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
259 bit_depth != 8 && bit_depth != 16)
260 png_error(png_ptr, "Invalid bit depth in IHDR");
261
262 if (color_type < 0 || color_type == 1 ||
263 color_type == 5 || color_type > 6)
264 png_error(png_ptr, "Invalid color type in IHDR");
265
266 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
267 ((color_type == PNG_COLOR_TYPE_RGB ||
268 color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
269 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
270 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
271
272 if (interlace_type >= PNG_INTERLACE_LAST)
273 png_error(png_ptr, "Unknown interlace method in IHDR");
274
275 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
276 png_error(png_ptr, "Unknown compression method in IHDR");
277
278#if defined(PNG_MNG_FEATURES_SUPPORTED)
279 /* Accept filter_method 64 (intrapixel differencing) only if
280 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
281 * 2. Libpng did not read a PNG signature (this filter_method is only
282 * used in PNG datastreams that are embedded in MNG datastreams) and
283 * 3. The application called png_permit_mng_features with a mask that
284 * included PNG_FLAG_MNG_FILTER_64 and
285 * 4. The filter_method is 64 and
286 * 5. The color_type is RGB or RGBA
287 */
288 if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
289 png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
290 if(filter_type != PNG_FILTER_TYPE_BASE)
291 {
292 if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
293 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
294 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
295 (color_type == PNG_COLOR_TYPE_RGB ||
296 color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
297 png_error(png_ptr, "Unknown filter method in IHDR");
298 if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
299 png_warning(png_ptr, "Invalid filter method in IHDR");
300 }
301#else
302 if(filter_type != PNG_FILTER_TYPE_BASE)
303 png_error(png_ptr, "Unknown filter method in IHDR");
304#endif
305
306 info_ptr->width = width;
307 info_ptr->height = height;
308 info_ptr->bit_depth = (png_byte)bit_depth;
309 info_ptr->color_type =(png_byte) color_type;
310 info_ptr->compression_type = (png_byte)compression_type;
311 info_ptr->filter_type = (png_byte)filter_type;
312 info_ptr->interlace_type = (png_byte)interlace_type;
313 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
314 info_ptr->channels = 1;
315 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
316 info_ptr->channels = 3;
317 else
318 info_ptr->channels = 1;
319 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
320 info_ptr->channels++;
321 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
322
323 /* check for overflow */
324 rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
325 if ( width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
326 {
327 png_warning(png_ptr,
328 "Width too large to process image data; rowbytes will overflow.");
329 info_ptr->rowbytes = (png_size_t)0;
330 }
331 else
332 info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
333}
334
335#if defined(PNG_oFFs_SUPPORTED)
336void PNGAPI
337png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
338 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
339{
340 png_debug1(1, "in %s storage function\n", "oFFs");
341 if (png_ptr == NULL || info_ptr == NULL)
342 return;
343
344 info_ptr->x_offset = offset_x;
345 info_ptr->y_offset = offset_y;
346 info_ptr->offset_unit_type = (png_byte)unit_type;
347 info_ptr->valid |= PNG_INFO_oFFs;
348}
349#endif
350
351#if defined(PNG_pCAL_SUPPORTED)
352void PNGAPI
353png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
354 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
355 png_charp units, png_charpp params)
356{
357 png_uint_32 length;
358 int i;
359
360 png_debug1(1, "in %s storage function\n", "pCAL");
361 if (png_ptr == NULL || info_ptr == NULL)
362 return;
363
364 length = png_strlen(purpose) + 1;
365 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
366 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
367 if (info_ptr->pcal_purpose == NULL)
368 {
369 png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
370 return;
371 }
372 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
373
374 png_debug(3, "storing X0, X1, type, and nparams in info\n");
375 info_ptr->pcal_X0 = X0;
376 info_ptr->pcal_X1 = X1;
377 info_ptr->pcal_type = (png_byte)type;
378 info_ptr->pcal_nparams = (png_byte)nparams;
379
380 length = png_strlen(units) + 1;
381 png_debug1(3, "allocating units for info (%lu bytes)\n", length);
382 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
383 if (info_ptr->pcal_units == NULL)
384 {
385 png_warning(png_ptr, "Insufficient memory for pCAL units.");
386 return;
387 }
388 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
389
390 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
391 (png_uint_32)((nparams + 1) * sizeof(png_charp)));
392 if (info_ptr->pcal_params == NULL)
393 {
394 png_warning(png_ptr, "Insufficient memory for pCAL params.");
395 return;
396 }
397
398 info_ptr->pcal_params[nparams] = NULL;
399
400 for (i = 0; i < nparams; i++)
401 {
402 length = png_strlen(params[i]) + 1;
403 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
404 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
405 if (info_ptr->pcal_params[i] == NULL)
406 {
407 png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
408 return;
409 }
410 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
411 }
412
413 info_ptr->valid |= PNG_INFO_pCAL;
414#ifdef PNG_FREE_ME_SUPPORTED
415 info_ptr->free_me |= PNG_FREE_PCAL;
416#endif
417}
418#endif
419
420#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
421#ifdef PNG_FLOATING_POINT_SUPPORTED
422void PNGAPI
423png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
424 int unit, double width, double height)
425{
426 png_debug1(1, "in %s storage function\n", "sCAL");
427 if (png_ptr == NULL || info_ptr == NULL)
428 return;
429
430 info_ptr->scal_unit = (png_byte)unit;
431 info_ptr->scal_pixel_width = width;
432 info_ptr->scal_pixel_height = height;
433
434 info_ptr->valid |= PNG_INFO_sCAL;
435}
436#else
437#ifdef PNG_FIXED_POINT_SUPPORTED
438void PNGAPI
439png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
440 int unit, png_charp swidth, png_charp sheight)
441{
442 png_uint_32 length;
443
444 png_debug1(1, "in %s storage function\n", "sCAL");
445 if (png_ptr == NULL || info_ptr == NULL)
446 return;
447
448 info_ptr->scal_unit = (png_byte)unit;
449
450 length = png_strlen(swidth) + 1;
451 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
452 info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
453 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
454
455 length = png_strlen(sheight) + 1;
456 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
457 info_ptr->scal_s_height = (png_charp)png_malloc(png_ptr, length);
458 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
459
460 info_ptr->valid |= PNG_INFO_sCAL;
461#ifdef PNG_FREE_ME_SUPPORTED
462 info_ptr->free_me |= PNG_FREE_SCAL;
463#endif
464}
465#endif
466#endif
467#endif
468
469#if defined(PNG_pHYs_SUPPORTED)
470void PNGAPI
471png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
472 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
473{
474 png_debug1(1, "in %s storage function\n", "pHYs");
475 if (png_ptr == NULL || info_ptr == NULL)
476 return;
477
478 info_ptr->x_pixels_per_unit = res_x;
479 info_ptr->y_pixels_per_unit = res_y;
480 info_ptr->phys_unit_type = (png_byte)unit_type;
481 info_ptr->valid |= PNG_INFO_pHYs;
482}
483#endif
484
485void PNGAPI
486png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
487 png_colorp palette, int num_palette)
488{
489
490 png_debug1(1, "in %s storage function\n", "PLTE");
491 if (png_ptr == NULL || info_ptr == NULL)
492 return;
493
494 /*
495 * It may not actually be necessary to set png_ptr->palette here;
496 * we do it for backward compatibility with the way the png_handle_tRNS
497 * function used to do the allocation.
498 */
499#ifdef PNG_FREE_ME_SUPPORTED
500 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
501#endif
502 /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
503 in case of an invalid PNG file that has too-large sample values. */
504 png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)256,
505 sizeof (png_color));
506 if (png_ptr->palette == NULL)
507 png_error(png_ptr, "Unable to malloc palette");
508 png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
509 info_ptr->palette = png_ptr->palette;
510 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
511
512#ifdef PNG_FREE_ME_SUPPORTED
513 info_ptr->free_me |= PNG_FREE_PLTE;
514#else
515 png_ptr->flags |= PNG_FLAG_FREE_PLTE;
516#endif
517
518 info_ptr->valid |= PNG_INFO_PLTE;
519}
520
521#if defined(PNG_sBIT_SUPPORTED)
522void PNGAPI
523png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
524 png_color_8p sig_bit)
525{
526 png_debug1(1, "in %s storage function\n", "sBIT");
527 if (png_ptr == NULL || info_ptr == NULL)
528 return;
529
530 png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
531 info_ptr->valid |= PNG_INFO_sBIT;
532}
533#endif
534
535#if defined(PNG_sRGB_SUPPORTED)
536void PNGAPI
537png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
538{
539 png_debug1(1, "in %s storage function\n", "sRGB");
540 if (png_ptr == NULL || info_ptr == NULL)
541 return;
542
543 info_ptr->srgb_intent = (png_byte)intent;
544 info_ptr->valid |= PNG_INFO_sRGB;
545}
546
547void PNGAPI
548png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
549 int intent)
550{
551#if defined(PNG_gAMA_SUPPORTED)
552#ifdef PNG_FLOATING_POINT_SUPPORTED
553 float file_gamma;
554#endif
555#ifdef PNG_FIXED_POINT_SUPPORTED
556 png_fixed_point int_file_gamma;
557#endif
558#endif
559#if defined(PNG_cHRM_SUPPORTED)
560#ifdef PNG_FLOATING_POINT_SUPPORTED
561 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
562#endif
563#ifdef PNG_FIXED_POINT_SUPPORTED
564 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
565 int_green_y, int_blue_x, int_blue_y;
566#endif
567#endif
568 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
569 if (png_ptr == NULL || info_ptr == NULL)
570 return;
571
572 png_set_sRGB(png_ptr, info_ptr, intent);
573
574#if defined(PNG_gAMA_SUPPORTED)
575#ifdef PNG_FLOATING_POINT_SUPPORTED
576 file_gamma = (float).45455;
577 png_set_gAMA(png_ptr, info_ptr, file_gamma);
578#endif
579#ifdef PNG_FIXED_POINT_SUPPORTED
580 int_file_gamma = 45455L;
581 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
582#endif
583#endif
584
585#if defined(PNG_cHRM_SUPPORTED)
586#ifdef PNG_FIXED_POINT_SUPPORTED
587 int_white_x = 31270L;
588 int_white_y = 32900L;
589 int_red_x = 64000L;
590 int_red_y = 33000L;
591 int_green_x = 30000L;
592 int_green_y = 60000L;
593 int_blue_x = 15000L;
594 int_blue_y = 6000L;
595
596 png_set_cHRM_fixed(png_ptr, info_ptr,
597 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
598 int_blue_x, int_blue_y);
599#endif
600#ifdef PNG_FLOATING_POINT_SUPPORTED
601 white_x = (float).3127;
602 white_y = (float).3290;
603 red_x = (float).64;
604 red_y = (float).33;
605 green_x = (float).30;
606 green_y = (float).60;
607 blue_x = (float).15;
608 blue_y = (float).06;
609
610 png_set_cHRM(png_ptr, info_ptr,
611 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
612#endif
613#endif
614}
615#endif
616
617
618#if defined(PNG_iCCP_SUPPORTED)
619void PNGAPI
620png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
621 png_charp name, int compression_type,
622 png_charp profile, png_uint_32 proflen)
623{
624 png_charp new_iccp_name;
625 png_charp new_iccp_profile;
626
627 png_debug1(1, "in %s storage function\n", "iCCP");
628 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
629 return;
630
631 new_iccp_name = (png_charp)png_malloc(png_ptr, png_strlen(name)+1);
632 png_strcpy(new_iccp_name, name);
633 new_iccp_profile = (png_charp)png_malloc(png_ptr, proflen);
634 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
635
636 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
637
638 info_ptr->iccp_proflen = proflen;
639 info_ptr->iccp_name = new_iccp_name;
640 info_ptr->iccp_profile = new_iccp_profile;
641 /* Compression is always zero but is here so the API and info structure
642 * does not have to change if we introduce multiple compression types */
643 info_ptr->iccp_compression = (png_byte)compression_type;
644#ifdef PNG_FREE_ME_SUPPORTED
645 info_ptr->free_me |= PNG_FREE_ICCP;
646#endif
647 info_ptr->valid |= PNG_INFO_iCCP;
648}
649#endif
650
651#if defined(PNG_TEXT_SUPPORTED)
652void PNGAPI
653png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
654 int num_text)
655{
656 int ret;
657 ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
658 if (ret)
659 png_error(png_ptr, "Insufficient memory to store text");
660}
661
662int /* PRIVATE */
663png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
664 int num_text)
665{
666 int i;
667
668 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
669 "text" : (png_const_charp)png_ptr->chunk_name));
670
671 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
672 return(0);
673
674 /* Make sure we have enough space in the "text" array in info_struct
675 * to hold all of the incoming text_ptr objects.
676 */
677 if (info_ptr->num_text + num_text > info_ptr->max_text)
678 {
679 if (info_ptr->text != NULL)
680 {
681 png_textp old_text;
682 int old_max;
683
684 old_max = info_ptr->max_text;
685 info_ptr->max_text = info_ptr->num_text + num_text + 8;
686 old_text = info_ptr->text;
687 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
688 (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
689 if (info_ptr->text == NULL)
690 {
691 png_free(png_ptr, old_text);
692 return(1);
693 }
694 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
695 sizeof(png_text)));
696 png_free(png_ptr, old_text);
697 }
698 else
699 {
700 info_ptr->max_text = num_text + 8;
701 info_ptr->num_text = 0;
702 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
703 (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
704 if (info_ptr->text == NULL)
705 return(1);
706#ifdef PNG_FREE_ME_SUPPORTED
707 info_ptr->free_me |= PNG_FREE_TEXT;
708#endif
709 }
710 png_debug1(3, "allocated %d entries for info_ptr->text\n",
711 info_ptr->max_text);
712 }
713 for (i = 0; i < num_text; i++)
714 {
715 png_size_t text_length,key_len;
716 png_size_t lang_len,lang_key_len;
717 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
718
719 if (text_ptr[i].key == NULL)
720 continue;
721
722 key_len = png_strlen(text_ptr[i].key);
723
724 if(text_ptr[i].compression <= 0)
725 {
726 lang_len = 0;
727 lang_key_len = 0;
728 }
729 else
730#ifdef PNG_iTXt_SUPPORTED
731 {
732 /* set iTXt data */
733 if (text_ptr[i].lang != NULL)
734 lang_len = png_strlen(text_ptr[i].lang);
735 else
736 lang_len = 0;
737 if (text_ptr[i].lang_key != NULL)
738 lang_key_len = png_strlen(text_ptr[i].lang_key);
739 else
740 lang_key_len = 0;
741 }
742#else
743 {
744 png_warning(png_ptr, "iTXt chunk not supported.");
745 continue;
746 }
747#endif
748
749 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
750 {
751 text_length = 0;
752#ifdef PNG_iTXt_SUPPORTED
753 if(text_ptr[i].compression > 0)
754 textp->compression = PNG_ITXT_COMPRESSION_NONE;
755 else
756#endif
757 textp->compression = PNG_TEXT_COMPRESSION_NONE;
758 }
759 else
760 {
761 text_length = png_strlen(text_ptr[i].text);
762 textp->compression = text_ptr[i].compression;
763 }
764
765 textp->key = (png_charp)png_malloc_warn(png_ptr,
766 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
767 if (textp->key == NULL)
768 return(1);
769 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
770 (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
771 (int)textp->key);
772
773 png_memcpy(textp->key, text_ptr[i].key,
774 (png_size_t)(key_len));
775 *(textp->key+key_len) = '\0';
776#ifdef PNG_iTXt_SUPPORTED
777 if (text_ptr[i].compression > 0)
778 {
779 textp->lang=textp->key + key_len + 1;
780 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
781 *(textp->lang+lang_len) = '\0';
782 textp->lang_key=textp->lang + lang_len + 1;
783 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
784 *(textp->lang_key+lang_key_len) = '\0';
785 textp->text=textp->lang_key + lang_key_len + 1;
786 }
787 else
788#endif
789 {
790#ifdef PNG_iTXt_SUPPORTED
791 textp->lang=NULL;
792 textp->lang_key=NULL;
793#endif
794 textp->text=textp->key + key_len + 1;
795 }
796 if(text_length)
797 png_memcpy(textp->text, text_ptr[i].text,
798 (png_size_t)(text_length));
799 *(textp->text+text_length) = '\0';
800
801#ifdef PNG_iTXt_SUPPORTED
802 if(textp->compression > 0)
803 {
804 textp->text_length = 0;
805 textp->itxt_length = text_length;
806 }
807 else
808#endif
809 {
810 textp->text_length = text_length;
811#ifdef PNG_iTXt_SUPPORTED
812 textp->itxt_length = 0;
813#endif
814 }
815 info_ptr->text[info_ptr->num_text]= *textp;
816 info_ptr->num_text++;
817 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
818 }
819 return(0);
820}
821#endif
822
823#if defined(PNG_tIME_SUPPORTED)
824void PNGAPI
825png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
826{
827 png_debug1(1, "in %s storage function\n", "tIME");
828 if (png_ptr == NULL || info_ptr == NULL ||
829 (png_ptr->mode & PNG_WROTE_tIME))
830 return;
831
832 png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
833 info_ptr->valid |= PNG_INFO_tIME;
834}
835#endif
836
837#if defined(PNG_tRNS_SUPPORTED)
838void PNGAPI
839png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
840 png_bytep trans, int num_trans, png_color_16p trans_values)
841{
842 png_debug1(1, "in %s storage function\n", "tRNS");
843 if (png_ptr == NULL || info_ptr == NULL)
844 return;
845
846 if (trans != NULL)
847 {
848 /*
849 * It may not actually be necessary to set png_ptr->trans here;
850 * we do it for backward compatibility with the way the png_handle_tRNS
851 * function used to do the allocation.
852 */
853#ifdef PNG_FREE_ME_SUPPORTED
854 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
855#endif
856 /* Changed from num_trans to 256 in version 1.2.1 */
857 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
858 (png_uint_32)256);
859 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
860#ifdef PNG_FREE_ME_SUPPORTED
861 info_ptr->free_me |= PNG_FREE_TRNS;
862#else
863 png_ptr->flags |= PNG_FLAG_FREE_TRNS;
864#endif
865 }
866
867 if (trans_values != NULL)
868 {
869 png_memcpy(&(info_ptr->trans_values), trans_values,
870 sizeof(png_color_16));
871 if (num_trans == 0)
872 num_trans = 1;
873 }
874 info_ptr->num_trans = (png_uint_16)num_trans;
875 info_ptr->valid |= PNG_INFO_tRNS;
876}
877#endif
878
879#if defined(PNG_sPLT_SUPPORTED)
880void PNGAPI
881png_set_sPLT(png_structp png_ptr,
882 png_infop info_ptr, png_sPLT_tp entries, int nentries)
883{
884 png_sPLT_tp np;
885 int i;
886
887 np = (png_sPLT_tp)png_malloc_warn(png_ptr,
888 (info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));
889 if (np == NULL)
890 {
891 png_warning(png_ptr, "No memory for sPLT palettes.");
892 return;
893 }
894
895 png_memcpy(np, info_ptr->splt_palettes,
896 info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
897 png_free(png_ptr, info_ptr->splt_palettes);
898 info_ptr->splt_palettes=NULL;
899
900 for (i = 0; i < nentries; i++)
901 {
902 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
903 png_sPLT_tp from = entries + i;
904
905 to->name = (png_charp)png_malloc(png_ptr,
906 png_strlen(from->name) + 1);
907 png_strcpy(to->name, from->name);
908 to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
909 from->nentries * sizeof(png_sPLT_t));
910 png_memcpy(to->entries, from->entries,
911 from->nentries * sizeof(png_sPLT_t));
912 to->nentries = from->nentries;
913 to->depth = from->depth;
914 }
915
916 info_ptr->splt_palettes = np;
917 info_ptr->splt_palettes_num += nentries;
918 info_ptr->valid |= PNG_INFO_sPLT;
919#ifdef PNG_FREE_ME_SUPPORTED
920 info_ptr->free_me |= PNG_FREE_SPLT;
921#endif
922}
923#endif /* PNG_sPLT_SUPPORTED */
924
925#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
926void PNGAPI
927png_set_unknown_chunks(png_structp png_ptr,
928 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
929{
930 png_unknown_chunkp np;
931 int i;
932
933 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
934 return;
935
936 np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
937 (info_ptr->unknown_chunks_num + num_unknowns) *
938 sizeof(png_unknown_chunk));
939 if (np == NULL)
940 {
941 png_warning(png_ptr, "Out of memory while processing unknown chunk.");
942 return;
943 }
944
945 png_memcpy(np, info_ptr->unknown_chunks,
946 info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
947 png_free(png_ptr, info_ptr->unknown_chunks);
948 info_ptr->unknown_chunks=NULL;
949
950 for (i = 0; i < num_unknowns; i++)
951 {
952 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
953 png_unknown_chunkp from = unknowns + i;
954
955 png_strcpy((png_charp)to->name, (png_charp)from->name);
956 to->data = (png_bytep)png_malloc(png_ptr, from->size);
957 if (to->data == NULL)
958 png_warning(png_ptr, "Out of memory while processing unknown chunk.");
959 else
960 {
961 png_memcpy(to->data, from->data, from->size);
962 to->size = from->size;
963
964 /* note our location in the read or write sequence */
965 to->location = (png_byte)(png_ptr->mode & 0xff);
966 }
967 }
968
969 info_ptr->unknown_chunks = np;
970 info_ptr->unknown_chunks_num += num_unknowns;
971#ifdef PNG_FREE_ME_SUPPORTED
972 info_ptr->free_me |= PNG_FREE_UNKN;
973#endif
974}
975void PNGAPI
976png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
977 int chunk, int location)
978{
979 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
980 (int)info_ptr->unknown_chunks_num)
981 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
982}
983#endif
984
985#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
986 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
987void PNGAPI
988png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
989{
990 /* This function is deprecated in favor of png_permit_mng_features()
991 and will be removed from libpng-2.0.0 */
992 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
993 if (png_ptr == NULL)
994 return;
995 png_ptr->mng_features_permitted = (png_byte)
996 ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
997 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
998}
999#endif
1000
1001#if defined(PNG_MNG_FEATURES_SUPPORTED)
1002png_uint_32 PNGAPI
1003png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1004{
1005 png_debug(1, "in png_permit_mng_features\n");
1006 if (png_ptr == NULL)
1007 return (png_uint_32)0;
1008 png_ptr->mng_features_permitted =
1009 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1010 return (png_uint_32)png_ptr->mng_features_permitted;
1011}
1012#endif
1013
1014#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1015void PNGAPI
1016png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1017 chunk_list, int num_chunks)
1018{
1019 png_bytep new_list, p;
1020 int i, old_num_chunks;
1021 if (num_chunks == 0)
1022 {
1023 if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
1024 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1025 else
1026 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1027
1028 if(keep == HANDLE_CHUNK_ALWAYS)
1029 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1030 else
1031 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1032 return;
1033 }
1034 if (chunk_list == NULL)
1035 return;
1036 old_num_chunks=png_ptr->num_chunk_list;
1037 new_list=(png_bytep)png_malloc(png_ptr,
1038 (png_uint_32)(5*(num_chunks+old_num_chunks)));
1039 if(png_ptr->chunk_list != NULL)
1040 {
1041 png_memcpy(new_list, png_ptr->chunk_list,
1042 (png_size_t)(5*old_num_chunks));
1043 png_free(png_ptr, png_ptr->chunk_list);
1044 png_ptr->chunk_list=NULL;
1045 }
1046 png_memcpy(new_list+5*old_num_chunks, chunk_list,
1047 (png_size_t)(5*num_chunks));
1048 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
1049 *p=(png_byte)keep;
1050 png_ptr->num_chunk_list=old_num_chunks+num_chunks;
1051 png_ptr->chunk_list=new_list;
1052#ifdef PNG_FREE_ME_SUPPORTED
1053 png_ptr->free_me |= PNG_FREE_LIST;
1054#endif
1055}
1056#endif
1057
1058#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1059void PNGAPI
1060png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1061 png_user_chunk_ptr read_user_chunk_fn)
1062{
1063 png_debug(1, "in png_set_read_user_chunk_fn\n");
1064 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1065 png_ptr->user_chunk_ptr = user_chunk_ptr;
1066}
1067#endif
1068
1069#if defined(PNG_INFO_IMAGE_SUPPORTED)
1070void PNGAPI
1071png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1072{
1073 png_debug1(1, "in %s storage function\n", "rows");
1074
1075 if (png_ptr == NULL || info_ptr == NULL)
1076 return;
1077
1078 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1079 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1080 info_ptr->row_pointers = row_pointers;
1081 if(row_pointers)
1082 info_ptr->valid |= PNG_INFO_IDAT;
1083}
1084#endif
1085
1086void PNGAPI
1087png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
1088{
1089 if(png_ptr->zbuf)
1090 png_free(png_ptr, png_ptr->zbuf);
1091 png_ptr->zbuf_size = (png_size_t)size;
1092 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1093 png_ptr->zstream.next_out = png_ptr->zbuf;
1094 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1095}
1096
1097void PNGAPI
1098png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1099{
1100 if (png_ptr && info_ptr)
1101 info_ptr->valid &= ~(mask);
1102}
1103
1104
1105#ifndef PNG_1_0_X
1106#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1107/* this function was added to libpng 1.2.0 and should always exist by default */
1108void PNGAPI
1109png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1110{
1111 png_uint_32 settable_asm_flags;
1112 png_uint_32 settable_mmx_flags;
1113
1114 settable_mmx_flags =
1115#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
1116 PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
1117#endif
1118#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
1119 PNG_ASM_FLAG_MMX_READ_INTERLACE |
1120#endif
1121#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
1122 PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
1123 PNG_ASM_FLAG_MMX_READ_FILTER_UP |
1124 PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
1125 PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
1126#endif
1127 0;
1128
1129 /* could be some non-MMX ones in the future, but not currently: */
1130 settable_asm_flags = settable_mmx_flags;
1131
1132 if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
1133 !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
1134 {
1135 /* clear all MMX flags if MMX isn't supported */
1136 settable_asm_flags &= ~settable_mmx_flags;
1137 png_ptr->asm_flags &= ~settable_mmx_flags;
1138 }
1139
1140 /* we're replacing the settable bits with those passed in by the user,
1141 * so first zero them out of the master copy, then logical-OR in the
1142 * allowed subset that was requested */
1143
1144 png_ptr->asm_flags &= ~settable_asm_flags; /* zero them */
1145 png_ptr->asm_flags |= (asm_flags & settable_asm_flags); /* set them */
1146}
1147#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1148
1149#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1150/* this function was added to libpng 1.2.0 */
1151void PNGAPI
1152png_set_mmx_thresholds (png_structp png_ptr,
1153 png_byte mmx_bitdepth_threshold,
1154 png_uint_32 mmx_rowbytes_threshold)
1155{
1156 png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1157 png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1158}
1159#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1160#endif /* ?PNG_1_0_X */
wxWidgets (Impactor)