| blob | 9d6662720692caee44bf20b12877f4bd390f9e83 |
1 Index: pngread.c
2 ===================================================================
3 --- pngread.c
4 +++ pngread.c
5 @@ -158,6 +158,9 @@
7 else if (chunk_name == png_IDAT)
8 {
9 +#ifdef PNG_READ_APNG_SUPPORTED
10 + png_have_info(png_ptr, info_ptr);
11 +#endif
12 png_ptr->idat_size = length;
13 break;
14 }
15 @@ -247,6 +250,17 @@
16 png_handle_iTXt(png_ptr, info_ptr, length);
17 #endif
19 +#ifdef PNG_READ_APNG_SUPPORTED
20 + else if (chunk_name == png_acTL)
21 + png_handle_acTL(png_ptr, info_ptr, length);
22 +
23 + else if (chunk_name == png_fcTL)
24 + png_handle_fcTL(png_ptr, info_ptr, length);
25 +
26 + else if (chunk_name == png_fdAT)
27 + png_handle_fdAT(png_ptr, info_ptr, length);
28 +#endif
29 +
30 else
31 png_handle_unknown(png_ptr, info_ptr, length,
32 PNG_HANDLE_CHUNK_AS_DEFAULT);
33 @@ -254,6 +268,72 @@
34 }
35 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
37 +#ifdef PNG_READ_APNG_SUPPORTED
38 +void PNGAPI
39 +png_read_frame_head(png_structp png_ptr, png_infop info_ptr)
40 +{
41 + png_byte have_chunk_after_DAT; /* after IDAT or after fdAT */
42 +
43 + png_debug(0, "Reading frame head");
44 +
45 + if (!(png_ptr->mode & PNG_HAVE_acTL))
46 + png_error(png_ptr, "attempt to png_read_frame_head() but "
47 + "no acTL present");
48 +
49 + /* do nothing for the main IDAT */
50 + if (png_ptr->num_frames_read == 0)
51 + return;
52 +
53 + png_read_reset(png_ptr);
54 + png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
55 + png_ptr->mode &= ~PNG_HAVE_fcTL;
56 +
57 + have_chunk_after_DAT = 0;
58 + for (;;)
59 + {
60 + png_uint_32 length = png_read_chunk_header(png_ptr);
61 +
62 + if (png_ptr->chunk_name == png_IDAT)
63 + {
64 + /* discard trailing IDATs for the first frame */
65 + if (have_chunk_after_DAT || png_ptr->num_frames_read > 1)
66 + png_error(png_ptr, "png_read_frame_head(): out of place IDAT");
67 + png_crc_finish(png_ptr, length);
68 + }
69 +
70 + else if (png_ptr->chunk_name == png_fcTL)
71 + {
72 + png_handle_fcTL(png_ptr, info_ptr, length);
73 + have_chunk_after_DAT = 1;
74 + }
75 +
76 + else if (png_ptr->chunk_name == png_fdAT)
77 + {
78 + png_ensure_sequence_number(png_ptr, length);
79 +
80 + /* discard trailing fdATs for frames other than the first */
81 + if (!have_chunk_after_DAT && png_ptr->num_frames_read > 1)
82 + png_crc_finish(png_ptr, length - 4);
83 + else if(png_ptr->mode & PNG_HAVE_fcTL)
84 + {
85 + png_ptr->idat_size = length - 4;
86 + png_ptr->mode |= PNG_HAVE_IDAT;
87 +
88 + break;
89 + }
90 + else
91 + png_error(png_ptr, "png_read_frame_head(): out of place fdAT");
92 + }
93 + else
94 + {
95 + png_warning(png_ptr, "Skipped (ignored) a chunk "
96 + "between APNG chunks");
97 + png_crc_finish(png_ptr, length);
98 + }
99 + }
100 +}
101 +#endif /* PNG_READ_APNG_SUPPORTED */
102 +
103 /* Optional call to update the users info_ptr structure */
104 void PNGAPI
105 png_read_update_info(png_structrp png_ptr, png_inforp info_ptr)
106 Index: pngget.c
107 ===================================================================
108 --- pngget.c
109 +++ pngget.c
110 @@ -1174,4 +1174,166 @@
111 # endif
112 #endif
114 +#ifdef PNG_APNG_SUPPORTED
115 +png_uint_32 PNGAPI
116 +png_get_acTL(png_structp png_ptr, png_infop info_ptr,
117 + png_uint_32 *num_frames, png_uint_32 *num_plays)
118 +{
119 + png_debug1(1, "in %s retrieval function", "acTL");
120 +
121 + if (png_ptr != NULL && info_ptr != NULL &&
122 + (info_ptr->valid & PNG_INFO_acTL) &&
123 + num_frames != NULL && num_plays != NULL)
124 + {
125 + *num_frames = info_ptr->num_frames;
126 + *num_plays = info_ptr->num_plays;
127 + return (1);
128 + }
129 +
130 + return (0);
131 +}
132 +
133 +png_uint_32 PNGAPI
134 +png_get_num_frames(png_structp png_ptr, png_infop info_ptr)
135 +{
136 + png_debug(1, "in png_get_num_frames()");
137 +
138 + if (png_ptr != NULL && info_ptr != NULL)
139 + return (info_ptr->num_frames);
140 + return (0);
141 +}
142 +
143 +png_uint_32 PNGAPI
144 +png_get_num_plays(png_structp png_ptr, png_infop info_ptr)
145 +{
146 + png_debug(1, "in png_get_num_plays()");
147 +
148 + if (png_ptr != NULL && info_ptr != NULL)
149 + return (info_ptr->num_plays);
150 + return (0);
151 +}
152 +
153 +png_uint_32 PNGAPI
154 +png_get_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
155 + png_uint_32 *width, png_uint_32 *height,
156 + png_uint_32 *x_offset, png_uint_32 *y_offset,
157 + png_uint_16 *delay_num, png_uint_16 *delay_den,
158 + png_byte *dispose_op, png_byte *blend_op)
159 +{
160 + png_debug1(1, "in %s retrieval function", "fcTL");
161 +
162 + if (png_ptr != NULL && info_ptr != NULL &&
163 + (info_ptr->valid & PNG_INFO_fcTL) &&
164 + width != NULL && height != NULL &&
165 + x_offset != NULL && y_offset != NULL &&
166 + delay_num != NULL && delay_den != NULL &&
167 + dispose_op != NULL && blend_op != NULL)
168 + {
169 + *width = info_ptr->next_frame_width;
170 + *height = info_ptr->next_frame_height;
171 + *x_offset = info_ptr->next_frame_x_offset;
172 + *y_offset = info_ptr->next_frame_y_offset;
173 + *delay_num = info_ptr->next_frame_delay_num;
174 + *delay_den = info_ptr->next_frame_delay_den;
175 + *dispose_op = info_ptr->next_frame_dispose_op;
176 + *blend_op = info_ptr->next_frame_blend_op;
177 + return (1);
178 + }
179 +
180 + return (0);
181 +}
182 +
183 +png_uint_32 PNGAPI
184 +png_get_next_frame_width(png_structp png_ptr, png_infop info_ptr)
185 +{
186 + png_debug(1, "in png_get_next_frame_width()");
187 +
188 + if (png_ptr != NULL && info_ptr != NULL)
189 + return (info_ptr->next_frame_width);
190 + return (0);
191 +}
192 +
193 +png_uint_32 PNGAPI
194 +png_get_next_frame_height(png_structp png_ptr, png_infop info_ptr)
195 +{
196 + png_debug(1, "in png_get_next_frame_height()");
197 +
198 + if (png_ptr != NULL && info_ptr != NULL)
199 + return (info_ptr->next_frame_height);
200 + return (0);
201 +}
202 +
203 +png_uint_32 PNGAPI
204 +png_get_next_frame_x_offset(png_structp png_ptr, png_infop info_ptr)
205 +{
206 + png_debug(1, "in png_get_next_frame_x_offset()");
207 +
208 + if (png_ptr != NULL && info_ptr != NULL)
209 + return (info_ptr->next_frame_x_offset);
210 + return (0);
211 +}
212 +
213 +png_uint_32 PNGAPI
214 +png_get_next_frame_y_offset(png_structp png_ptr, png_infop info_ptr)
215 +{
216 + png_debug(1, "in png_get_next_frame_y_offset()");
217 +
218 + if (png_ptr != NULL && info_ptr != NULL)
219 + return (info_ptr->next_frame_y_offset);
220 + return (0);
221 +}
222 +
223 +png_uint_16 PNGAPI
224 +png_get_next_frame_delay_num(png_structp png_ptr, png_infop info_ptr)
225 +{
226 + png_debug(1, "in png_get_next_frame_delay_num()");
227 +
228 + if (png_ptr != NULL && info_ptr != NULL)
229 + return (info_ptr->next_frame_delay_num);
230 + return (0);
231 +}
232 +
233 +png_uint_16 PNGAPI
234 +png_get_next_frame_delay_den(png_structp png_ptr, png_infop info_ptr)
235 +{
236 + png_debug(1, "in png_get_next_frame_delay_den()");
237 +
238 + if (png_ptr != NULL && info_ptr != NULL)
239 + return (info_ptr->next_frame_delay_den);
240 + return (0);
241 +}
242 +
243 +png_byte PNGAPI
244 +png_get_next_frame_dispose_op(png_structp png_ptr, png_infop info_ptr)
245 +{
246 + png_debug(1, "in png_get_next_frame_dispose_op()");
247 +
248 + if (png_ptr != NULL && info_ptr != NULL)
249 + return (info_ptr->next_frame_dispose_op);
250 + return (0);
251 +}
252 +
253 +png_byte PNGAPI
254 +png_get_next_frame_blend_op(png_structp png_ptr, png_infop info_ptr)
255 +{
256 + png_debug(1, "in png_get_next_frame_blend_op()");
257 +
258 + if (png_ptr != NULL && info_ptr != NULL)
259 + return (info_ptr->next_frame_blend_op);
260 + return (0);
261 +}
262 +
263 +png_byte PNGAPI
264 +png_get_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr)
265 +{
266 + png_debug(1, "in png_first_frame_is_hidden()");
267 +
268 + if (png_ptr != NULL)
269 + return (png_byte)(png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN);
270 +
271 + PNG_UNUSED(info_ptr)
272 +
273 + return 0;
274 +}
275 +#endif /* PNG_APNG_SUPPORTED */
276 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
277 Index: png.h
278 ===================================================================
279 --- png.h
280 +++ png.h
281 @@ -443,6 +443,10 @@
282 # include "pnglibconf.h"
283 #endif
285 +#define PNG_APNG_SUPPORTED
286 +#define PNG_READ_APNG_SUPPORTED
287 +#define PNG_WRITE_APNG_SUPPORTED
288 +
289 #ifndef PNG_VERSION_INFO_ONLY
290 /* Machine specific configuration. */
291 # include "pngconf.h"
292 @@ -533,6 +537,17 @@
293 * See pngconf.h for base types that vary by machine/system
294 */
296 +#ifdef PNG_APNG_SUPPORTED
297 +/* dispose_op flags from inside fcTL */
298 +#define PNG_DISPOSE_OP_NONE 0x00
299 +#define PNG_DISPOSE_OP_BACKGROUND 0x01
300 +#define PNG_DISPOSE_OP_PREVIOUS 0x02
301 +
302 +/* blend_op flags from inside fcTL */
303 +#define PNG_BLEND_OP_SOURCE 0x00
304 +#define PNG_BLEND_OP_OVER 0x01
305 +#endif /* PNG_APNG_SUPPORTED */
306 +
307 /* This triggers a compiler error in png.c, if png.c and png.h
308 * do not agree upon the version number.
309 */
310 @@ -852,6 +867,10 @@
311 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
312 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
313 #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
314 +#ifdef PNG_APNG_SUPPORTED
315 +#define PNG_INFO_acTL 0x10000
316 +#define PNG_INFO_fcTL 0x20000
317 +#endif
319 /* This is used for the transformation routines, as some of them
320 * change these values for the row. It also should enable using
321 @@ -889,6 +908,10 @@
322 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
323 typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
324 typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
325 +#ifdef PNG_APNG_SUPPORTED
326 +typedef PNG_CALLBACK(void, *png_progressive_frame_ptr, (png_structp,
327 + png_uint_32));
328 +#endif
330 /* The following callback receives png_uint_32 row_number, int pass for the
331 * png_bytep data of the row. When transforming an interlaced image the
332 @@ -3292,6 +3315,75 @@
333 * END OF HARDWARE OPTIONS
334 ******************************************************************************/
336 +#ifdef PNG_APNG_SUPPORTED
337 +PNG_EXPORT(245, png_uint_32, png_get_acTL, (png_structp png_ptr,
338 + png_infop info_ptr, png_uint_32 *num_frames, png_uint_32 *num_plays));
339 +
340 +PNG_EXPORT(246, png_uint_32, png_set_acTL, (png_structp png_ptr,
341 + png_infop info_ptr, png_uint_32 num_frames, png_uint_32 num_plays));
342 +
343 +PNG_EXPORT(247, png_uint_32, png_get_num_frames, (png_structp png_ptr,
344 + png_infop info_ptr));
345 +
346 +PNG_EXPORT(248, png_uint_32, png_get_num_plays, (png_structp png_ptr,
347 + png_infop info_ptr));
348 +
349 +PNG_EXPORT(249, png_uint_32, png_get_next_frame_fcTL,
350 + (png_structp png_ptr, png_infop info_ptr, png_uint_32 *width,
351 + png_uint_32 *height, png_uint_32 *x_offset, png_uint_32 *y_offset,
352 + png_uint_16 *delay_num, png_uint_16 *delay_den, png_byte *dispose_op,
353 + png_byte *blend_op));
354 +
355 +PNG_EXPORT(250, png_uint_32, png_set_next_frame_fcTL,
356 + (png_structp png_ptr, png_infop info_ptr, png_uint_32 width,
357 + png_uint_32 height, png_uint_32 x_offset, png_uint_32 y_offset,
358 + png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
359 + png_byte blend_op));
360 +
361 +PNG_EXPORT(251, png_uint_32, png_get_next_frame_width,
362 + (png_structp png_ptr, png_infop info_ptr));
363 +PNG_EXPORT(252, png_uint_32, png_get_next_frame_height,
364 + (png_structp png_ptr, png_infop info_ptr));
365 +PNG_EXPORT(253, png_uint_32, png_get_next_frame_x_offset,
366 + (png_structp png_ptr, png_infop info_ptr));
367 +PNG_EXPORT(254, png_uint_32, png_get_next_frame_y_offset,
368 + (png_structp png_ptr, png_infop info_ptr));
369 +PNG_EXPORT(255, png_uint_16, png_get_next_frame_delay_num,
370 + (png_structp png_ptr, png_infop info_ptr));
371 +PNG_EXPORT(256, png_uint_16, png_get_next_frame_delay_den,
372 + (png_structp png_ptr, png_infop info_ptr));
373 +PNG_EXPORT(257, png_byte, png_get_next_frame_dispose_op,
374 + (png_structp png_ptr, png_infop info_ptr));
375 +PNG_EXPORT(258, png_byte, png_get_next_frame_blend_op,
376 + (png_structp png_ptr, png_infop info_ptr));
377 +PNG_EXPORT(259, png_byte, png_get_first_frame_is_hidden,
378 + (png_structp png_ptr, png_infop info_ptr));
379 +PNG_EXPORT(260, png_uint_32, png_set_first_frame_is_hidden,
380 + (png_structp png_ptr, png_infop info_ptr, png_byte is_hidden));
381 +
382 +#ifdef PNG_READ_APNG_SUPPORTED
383 +PNG_EXPORT(261, void, png_read_frame_head, (png_structp png_ptr,
384 + png_infop info_ptr));
385 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
386 +PNG_EXPORT(262, void, png_set_progressive_frame_fn, (png_structp png_ptr,
387 + png_progressive_frame_ptr frame_info_fn,
388 + png_progressive_frame_ptr frame_end_fn));
389 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
390 +#endif /* PNG_READ_APNG_SUPPORTED */
391 +
392 +#ifdef PNG_WRITE_APNG_SUPPORTED
393 +PNG_EXPORT(263, void, png_write_frame_head, (png_structp png_ptr,
394 + png_infop info_ptr, png_bytepp row_pointers,
395 + png_uint_32 width, png_uint_32 height,
396 + png_uint_32 x_offset, png_uint_32 y_offset,
397 + png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
398 + png_byte blend_op));
399 +
400 +PNG_EXPORT(264, void, png_write_frame_tail, (png_structp png_ptr,
401 + png_infop info_ptr));
402 +#endif /* PNG_WRITE_APNG_SUPPORTED */
403 +#endif /* PNG_APNG_SUPPORTED */
404 +
405 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project
406 * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt
407 */
408 @@ -3301,7 +3393,11 @@
409 * scripts/symbols.def as well.
410 */
411 #ifdef PNG_EXPORT_LAST_ORDINAL
412 +#ifdef PNG_APNG_SUPPORTED
413 + PNG_EXPORT_LAST_ORDINAL(264);
414 +#else
415 PNG_EXPORT_LAST_ORDINAL(244);
416 +#endif /* PNG_APNG_SUPPORTED */
417 #endif
419 #ifdef __cplusplus
420 Index: pngpriv.h
421 ===================================================================
422 --- pngpriv.h
423 +++ pngpriv.h
424 @@ -502,6 +502,10 @@
425 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
426 /* 0x4000 (unused) */
427 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
428 +#ifdef PNG_APNG_SUPPORTED
429 +#define PNG_HAVE_acTL 0x10000
430 +#define PNG_HAVE_fcTL 0x20000
431 +#endif
433 /* Flags for the transformations the PNG library does on the image data */
434 #define PNG_BGR 0x0001
435 @@ -723,6 +727,16 @@
436 #define png_tRNS PNG_U32(116, 82, 78, 83)
437 #define png_zTXt PNG_U32(122, 84, 88, 116)
439 +#ifdef PNG_APNG_SUPPORTED
440 +#define png_acTL PNG_U32( 97, 99, 84, 76)
441 +#define png_fcTL PNG_U32(102, 99, 84, 76)
442 +#define png_fdAT PNG_U32(102, 100, 65, 84)
443 +
444 +/* For png_struct.apng_flags: */
445 +#define PNG_FIRST_FRAME_HIDDEN 0x0001
446 +#define PNG_APNG_APP 0x0002
447 +#endif
448 +
449 /* The following will work on (signed char*) strings, whereas the get_uint_32
450 * macro will fail on top-bit-set values because of the sign extension.
451 */
452 @@ -1516,6 +1530,49 @@
453 png_bytep row),PNG_EMPTY);
454 #endif
456 +#ifdef PNG_APNG_SUPPORTED
457 +PNG_INTERNAL_FUNCTION(void,png_ensure_fcTL_is_valid,(png_structp png_ptr,
458 + png_uint_32 width, png_uint_32 height,
459 + png_uint_32 x_offset, png_uint_32 y_offset,
460 + png_uint_16 delay_num, png_uint_16 delay_den,
461 + png_byte dispose_op, png_byte blend_op),PNG_EMPTY);
462 +
463 +#ifdef PNG_READ_APNG_SUPPORTED
464 +PNG_INTERNAL_FUNCTION(void,png_handle_acTL,(png_structp png_ptr,
465 + png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
466 +PNG_INTERNAL_FUNCTION(void,png_handle_fcTL,(png_structp png_ptr,
467 + png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
468 +PNG_INTERNAL_FUNCTION(void,png_handle_fdAT,(png_structp png_ptr,
469 + png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
470 +PNG_INTERNAL_FUNCTION(void,png_have_info,(png_structp png_ptr,
471 + png_infop info_ptr),PNG_EMPTY);
472 +PNG_INTERNAL_FUNCTION(void,png_ensure_sequence_number,(png_structp png_ptr,
473 + png_uint_32 length),PNG_EMPTY);
474 +PNG_INTERNAL_FUNCTION(void,png_read_reset,(png_structp png_ptr),PNG_EMPTY);
475 +PNG_INTERNAL_FUNCTION(void,png_read_reinit,(png_structp png_ptr,
476 + png_infop info_ptr),PNG_EMPTY);
477 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
478 +PNG_INTERNAL_FUNCTION(void,png_progressive_read_reset,(png_structp png_ptr),
479 + PNG_EMPTY);
480 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
481 +#endif /* PNG_READ_APNG_SUPPORTED */
482 +
483 +#ifdef PNG_WRITE_APNG_SUPPORTED
484 +PNG_INTERNAL_FUNCTION(void,png_write_acTL,(png_structp png_ptr,
485 + png_uint_32 num_frames, png_uint_32 num_plays),PNG_EMPTY);
486 +PNG_INTERNAL_FUNCTION(void,png_write_fcTL,(png_structp png_ptr,
487 + png_uint_32 width, png_uint_32 height,
488 + png_uint_32 x_offset, png_uint_32 y_offset,
489 + png_uint_16 delay_num, png_uint_16 delay_den,
490 + png_byte dispose_op, png_byte blend_op),PNG_EMPTY);
491 +PNG_INTERNAL_FUNCTION(void,png_write_fdAT,(png_structp png_ptr,
492 + png_const_bytep data, png_size_t length),PNG_EMPTY);
493 +PNG_INTERNAL_FUNCTION(void,png_write_reset,(png_structp png_ptr),PNG_EMPTY);
494 +PNG_INTERNAL_FUNCTION(void,png_write_reinit,(png_structp png_ptr,
495 + png_infop info_ptr, png_uint_32 width, png_uint_32 height),PNG_EMPTY);
496 +#endif /* PNG_WRITE_APNG_SUPPORTED */
497 +#endif /* PNG_APNG_SUPPORTED */
498 +
499 /* Added at libpng version 1.6.0 */
500 #ifdef PNG_GAMMA_SUPPORTED
501 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
502 Index: pnginfo.h
503 ===================================================================
504 --- pnginfo.h
505 +++ pnginfo.h
506 @@ -256,5 +256,18 @@
507 png_bytepp row_pointers; /* the image bits */
508 #endif
510 +#ifdef PNG_APNG_SUPPORTED
511 + png_uint_32 num_frames; /* including default image */
512 + png_uint_32 num_plays;
513 + png_uint_32 next_frame_width;
514 + png_uint_32 next_frame_height;
515 + png_uint_32 next_frame_x_offset;
516 + png_uint_32 next_frame_y_offset;
517 + png_uint_16 next_frame_delay_num;
518 + png_uint_16 next_frame_delay_den;
519 + png_byte next_frame_dispose_op;
520 + png_byte next_frame_blend_op;
521 +#endif
522 +
523 };
524 #endif /* PNGINFO_H */
525 Index: pngstruct.h
526 ===================================================================
527 --- pngstruct.h
528 +++ pngstruct.h
529 @@ -409,6 +409,27 @@
530 png_byte filter_type;
531 #endif
533 +#ifdef PNG_APNG_SUPPORTED
534 + png_uint_32 apng_flags;
535 + png_uint_32 next_seq_num; /* next fcTL/fdAT chunk sequence number */
536 + png_uint_32 first_frame_width;
537 + png_uint_32 first_frame_height;
538 +
539 +#ifdef PNG_READ_APNG_SUPPORTED
540 + png_uint_32 num_frames_read; /* incremented after all image data of */
541 + /* a frame is read */
542 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
543 + png_progressive_frame_ptr frame_info_fn; /* frame info read callback */
544 + png_progressive_frame_ptr frame_end_fn; /* frame data read callback */
545 +#endif
546 +#endif
547 +
548 +#ifdef PNG_WRITE_APNG_SUPPORTED
549 + png_uint_32 num_frames_to_write;
550 + png_uint_32 num_frames_written;
551 +#endif
552 +#endif /* PNG_APNG_SUPPORTED */
553 +
554 /* New members added in libpng-1.2.0 */
556 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
557 Index: pngwrite.c
558 ===================================================================
559 --- pngwrite.c
560 +++ pngwrite.c
561 @@ -127,6 +127,10 @@
562 * application continues writing the PNG. So check the 'invalid' flag here
563 * too.
564 */
565 +#ifdef PNG_WRITE_APNG_SUPPORTED
566 + if (info_ptr->valid & PNG_INFO_acTL)
567 + png_write_acTL(png_ptr, info_ptr->num_frames, info_ptr->num_plays);
568 +#endif
569 #ifdef PNG_GAMMA_SUPPORTED
570 # ifdef PNG_WRITE_gAMA_SUPPORTED
571 if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) &&
572 @@ -352,6 +356,11 @@
573 if (!(png_ptr->mode & PNG_HAVE_IDAT))
574 png_error(png_ptr, "No IDATs written into file");
576 +#ifdef PNG_WRITE_APNG_SUPPORTED
577 + if (png_ptr->num_frames_written != png_ptr->num_frames_to_write)
578 + png_error(png_ptr, "Not enough frames written");
579 +#endif
580 +
581 #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
582 if (png_ptr->num_palette_max > png_ptr->num_palette)
583 png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
584 @@ -2327,4 +2336,42 @@
585 }
586 #endif /* PNG_STDIO_SUPPORTED */
587 #endif /* SIMPLIFIED_WRITE */
588 +
589 +#ifdef PNG_WRITE_APNG_SUPPORTED
590 +void PNGAPI
591 +png_write_frame_head(png_structp png_ptr, png_infop info_ptr,
592 + png_bytepp row_pointers, png_uint_32 width, png_uint_32 height,
593 + png_uint_32 x_offset, png_uint_32 y_offset,
594 + png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
595 + png_byte blend_op)
596 +{
597 + png_debug(1, "in png_write_frame_head");
598 +
599 + /* there is a chance this has been set after png_write_info was called,
600 + * so it would be set but not written. is there a way to be sure? */
601 + if (!(info_ptr->valid & PNG_INFO_acTL))
602 + png_error(png_ptr, "png_write_frame_head(): acTL not set");
603 +
604 + png_write_reset(png_ptr);
605 +
606 + png_write_reinit(png_ptr, info_ptr, width, height);
607 +
608 + if ( !(png_ptr->num_frames_written == 0 &&
609 + (png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN) ) )
610 + png_write_fcTL(png_ptr, width, height, x_offset, y_offset,
611 + delay_num, delay_den, dispose_op, blend_op);
612 +
613 + PNG_UNUSED(row_pointers)
614 +}
615 +
616 +void PNGAPI
617 +png_write_frame_tail(png_structp png_ptr, png_infop info_ptr)
618 +{
619 + png_debug(1, "in png_write_frame_tail");
620 +
621 + png_ptr->num_frames_written++;
622 +
623 + PNG_UNUSED(info_ptr)
624 +}
625 +#endif /* PNG_WRITE_APNG_SUPPORTED */
626 #endif /* PNG_WRITE_SUPPORTED */
627 Index: pngpread.c
628 ===================================================================
629 --- pngpread.c
630 +++ pngpread.c
631 @@ -217,6 +217,109 @@
633 chunk_name = png_ptr->chunk_name;
635 +#ifdef PNG_READ_APNG_SUPPORTED
636 + if (png_ptr->num_frames_read > 0 &&
637 + png_ptr->num_frames_read < info_ptr->num_frames)
638 + {
639 + if (chunk_name == png_IDAT)
640 + {
641 + /* Discard trailing IDATs for the first frame */
642 + if (png_ptr->mode & PNG_HAVE_fcTL || png_ptr->num_frames_read > 1)
643 + png_error(png_ptr, "out of place IDAT");
644 +
645 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
646 + {
647 + png_push_save_buffer(png_ptr);
648 + return;
649 + }
650 +
651 + png_push_crc_skip(png_ptr, png_ptr->push_length);
652 + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
653 + return;
654 + }
655 + else if (chunk_name == png_fdAT)
656 + {
657 + if (png_ptr->buffer_size < 4)
658 + {
659 + png_push_save_buffer(png_ptr);
660 + return;
661 + }
662 +
663 + png_ensure_sequence_number(png_ptr, 4);
664 +
665 + if (!(png_ptr->mode & PNG_HAVE_fcTL))
666 + {
667 + /* Discard trailing fdATs for frames other than the first */
668 + if (png_ptr->num_frames_read < 2)
669 + png_error(png_ptr, "out of place fdAT");
670 +
671 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
672 + {
673 + png_push_save_buffer(png_ptr);
674 + return;
675 + }
676 +
677 + png_push_crc_skip(png_ptr, png_ptr->push_length);
678 + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
679 + return;
680 + }
681 +
682 + else
683 + {
684 + /* frame data follows */
685 + png_ptr->idat_size = png_ptr->push_length - 4;
686 + png_ptr->mode |= PNG_HAVE_IDAT;
687 + png_ptr->process_mode = PNG_READ_IDAT_MODE;
688 +
689 + return;
690 + }
691 + }
692 +
693 + else if (chunk_name == png_fcTL)
694 + {
695 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
696 + {
697 + png_push_save_buffer(png_ptr);
698 + return;
699 + }
700 +
701 + png_read_reset(png_ptr);
702 + png_ptr->mode &= ~PNG_HAVE_fcTL;
703 +
704 + png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length);
705 +
706 + if (!(png_ptr->mode & PNG_HAVE_fcTL))
707 + png_error(png_ptr, "missing required fcTL chunk");
708 +
709 + png_read_reinit(png_ptr, info_ptr);
710 + png_progressive_read_reset(png_ptr);
711 +
712 + if (png_ptr->frame_info_fn != NULL)
713 + (*(png_ptr->frame_info_fn))(png_ptr, png_ptr->num_frames_read);
714 +
715 + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
716 +
717 + return;
718 + }
719 +
720 + else
721 + {
722 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
723 + {
724 + png_push_save_buffer(png_ptr);
725 + return;
726 + }
727 + png_warning(png_ptr, "Skipped (ignored) a chunk "
728 + "between APNG chunks");
729 + png_push_crc_skip(png_ptr, png_ptr->push_length);
730 + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
731 + return;
732 + }
733 +
734 + return;
735 + }
736 +#endif /* PNG_READ_APNG_SUPPORTED */
737 +
738 if (chunk_name == png_IDAT)
739 {
740 if (png_ptr->mode & PNG_AFTER_IDAT)
741 @@ -299,6 +402,9 @@
743 else if (chunk_name == png_IDAT)
744 {
745 +#ifdef PNG_READ_APNG_SUPPORTED
746 + png_have_info(png_ptr, info_ptr);
747 +#endif
748 png_ptr->idat_size = png_ptr->push_length;
749 png_ptr->process_mode = PNG_READ_IDAT_MODE;
750 png_push_have_info(png_ptr, info_ptr);
751 @@ -530,6 +636,30 @@
752 }
754 #endif
755 +#ifdef PNG_READ_APNG_SUPPORTED
756 + else if (chunk_name == png_acTL)
757 + {
758 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
759 + {
760 + png_push_save_buffer(png_ptr);
761 + return;
762 + }
763 +
764 + png_handle_acTL(png_ptr, info_ptr, png_ptr->push_length);
765 + }
766 +
767 + else if (chunk_name == png_fcTL)
768 + {
769 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
770 + {
771 + png_push_save_buffer(png_ptr);
772 + return;
773 + }
774 +
775 + png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length);
776 + }
777 +
778 +#endif /* PNG_READ_APNG_SUPPORTED */
779 else
780 {
781 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
782 @@ -731,7 +861,11 @@
783 png_byte chunk_tag[4];
785 /* TODO: this code can be commoned up with the same code in push_read */
786 +#ifdef PNG_READ_APNG_SUPPORTED
787 + if (png_ptr->buffer_size < 12)
788 +#else
789 if (png_ptr->buffer_size < 8)
790 +#endif
791 {
792 png_push_save_buffer(png_ptr);
793 return;
794 @@ -744,17 +878,64 @@
795 png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
796 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
798 +#ifdef PNG_READ_APNG_SUPPORTED
799 + if (png_ptr->chunk_name != png_fdAT && png_ptr->num_frames_read > 0)
800 + {
801 + if (png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)
802 + {
803 + png_ptr->process_mode = PNG_READ_CHUNK_MODE;
804 + if (png_ptr->frame_end_fn != NULL)
805 + (*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read);
806 + png_ptr->num_frames_read++;
807 + return;
808 + }
809 + else
810 + {
811 + if (png_ptr->chunk_name == png_IEND)
812 + png_error(png_ptr, "Not enough image data");
813 + if (png_ptr->push_length + 4 > png_ptr->buffer_size)
814 + {
815 + png_push_save_buffer(png_ptr);
816 + return;
817 + }
818 + png_warning(png_ptr, "Skipping (ignoring) a chunk between "
819 + "APNG chunks");
820 + png_crc_finish(png_ptr, png_ptr->push_length);
821 + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
822 + return;
823 + }
824 + }
825 + else
826 +#endif
827 +#ifdef PNG_READ_APNG_SUPPORTED
828 + if (png_ptr->chunk_name != png_IDAT && png_ptr->num_frames_read == 0)
829 +#else
830 if (png_ptr->chunk_name != png_IDAT)
831 +#endif
832 {
833 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
835 if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED))
836 png_error(png_ptr, "Not enough compressed data");
838 +#ifdef PNG_READ_APNG_SUPPORTED
839 + if (png_ptr->frame_end_fn != NULL)
840 + (*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read);
841 + png_ptr->num_frames_read++;
842 +#endif
843 +
844 return;
845 }
847 png_ptr->idat_size = png_ptr->push_length;
848 +
849 +#ifdef PNG_READ_APNG_SUPPORTED
850 + if (png_ptr->num_frames_read > 0)
851 + {
852 + png_ensure_sequence_number(png_ptr, 4);
853 + png_ptr->idat_size -= 4;
854 + }
855 +#endif
856 }
858 if (png_ptr->idat_size && png_ptr->save_buffer_size)
859 @@ -832,6 +1013,15 @@
860 if (!(buffer_length > 0) || buffer == NULL)
861 png_error(png_ptr, "No IDAT data (internal error)");
863 +#ifdef PNG_READ_APNG_SUPPORTED
864 + /* If the app is not APNG-aware, decode only the first frame */
865 + if (!(png_ptr->apng_flags & PNG_APNG_APP) && png_ptr->num_frames_read > 0)
866 + {
867 + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
868 + return;
869 + }
870 +#endif
871 +
872 /* This routine must process all the data it has been given
873 * before returning, calling the row callback as required to
874 * handle the uncompressed results.
875 @@ -1280,6 +1470,18 @@
876 png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
877 }
879 +#ifdef PNG_READ_APNG_SUPPORTED
880 +void PNGAPI
881 +png_set_progressive_frame_fn(png_structp png_ptr,
882 + png_progressive_frame_ptr frame_info_fn,
883 + png_progressive_frame_ptr frame_end_fn)
884 +{
885 + png_ptr->frame_info_fn = frame_info_fn;
886 + png_ptr->frame_end_fn = frame_end_fn;
887 + png_ptr->apng_flags |= PNG_APNG_APP;
888 +}
889 +#endif
890 +
891 png_voidp PNGAPI
892 png_get_progressive_ptr(png_const_structrp png_ptr)
893 {
894 Index: pngset.c
895 ===================================================================
896 --- pngset.c
897 +++ pngset.c
898 @@ -239,6 +239,11 @@
899 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
901 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
902 +
903 +#ifdef PNG_APNG_SUPPORTED
904 + /* for non-animated png. this may be overwritten from an acTL chunk later */
905 + info_ptr->num_frames = 1;
906 +#endif
907 }
909 #ifdef PNG_oFFs_SUPPORTED
910 @@ -1065,6 +1070,147 @@
911 }
912 #endif /* PNG_sPLT_SUPPORTED */
914 +#ifdef PNG_APNG_SUPPORTED
915 +png_uint_32 PNGAPI
916 +png_set_acTL(png_structp png_ptr, png_infop info_ptr,
917 + png_uint_32 num_frames, png_uint_32 num_plays)
918 +{
919 + png_debug1(1, "in %s storage function", "acTL");
920 +
921 + if (png_ptr == NULL || info_ptr == NULL)
922 + {
923 + png_warning(png_ptr,
924 + "Call to png_set_acTL() with NULL png_ptr "
925 + "or info_ptr ignored");
926 + return (0);
927 + }
928 + if (num_frames == 0)
929 + {
930 + png_warning(png_ptr,
931 + "Ignoring attempt to set acTL with num_frames zero");
932 + return (0);
933 + }
934 + if (num_frames > PNG_UINT_31_MAX)
935 + {
936 + png_warning(png_ptr,
937 + "Ignoring attempt to set acTL with num_frames > 2^31-1");
938 + return (0);
939 + }
940 + if (num_plays > PNG_UINT_31_MAX)
941 + {
942 + png_warning(png_ptr,
943 + "Ignoring attempt to set acTL with num_plays "
944 + "> 2^31-1");
945 + return (0);
946 + }
947 +
948 + info_ptr->num_frames = num_frames;
949 + info_ptr->num_plays = num_plays;
950 +
951 + info_ptr->valid |= PNG_INFO_acTL;
952 +
953 + return (1);
954 +}
955 +
956 +/* delay_num and delay_den can hold any 16-bit values including zero */
957 +png_uint_32 PNGAPI
958 +png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
959 + png_uint_32 width, png_uint_32 height,
960 + png_uint_32 x_offset, png_uint_32 y_offset,
961 + png_uint_16 delay_num, png_uint_16 delay_den,
962 + png_byte dispose_op, png_byte blend_op)
963 +{
964 + png_debug1(1, "in %s storage function", "fcTL");
965 +
966 + if (png_ptr == NULL || info_ptr == NULL)
967 + {
968 + png_warning(png_ptr,
969 + "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
970 + "ignored");
971 + return (0);
972 + }
973 +
974 + png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
975 + delay_num, delay_den, dispose_op, blend_op);
976 +
977 + if (blend_op == PNG_BLEND_OP_OVER)
978 + {
979 + if (!(png_ptr->color_type & PNG_COLOR_MASK_ALPHA) &&
980 + !(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
981 + {
982 + png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
983 + "and wasteful for opaque images, ignored");
984 + blend_op = PNG_BLEND_OP_SOURCE;
985 + }
986 + }
987 +
988 + info_ptr->next_frame_width = width;
989 + info_ptr->next_frame_height = height;
990 + info_ptr->next_frame_x_offset = x_offset;
991 + info_ptr->next_frame_y_offset = y_offset;
992 + info_ptr->next_frame_delay_num = delay_num;
993 + info_ptr->next_frame_delay_den = delay_den;
994 + info_ptr->next_frame_dispose_op = dispose_op;
995 + info_ptr->next_frame_blend_op = blend_op;
996 +
997 + info_ptr->valid |= PNG_INFO_fcTL;
998 +
999 + return (1);
1000 +}
1001 +
1002 +void /* PRIVATE */
1003 +png_ensure_fcTL_is_valid(png_structp png_ptr,
1004 + png_uint_32 width, png_uint_32 height,
1005 + png_uint_32 x_offset, png_uint_32 y_offset,
1006 + png_uint_16 delay_num, png_uint_16 delay_den,
1007 + png_byte dispose_op, png_byte blend_op)
1008 +{
1009 + if (width > PNG_UINT_31_MAX)
1010 + png_error(png_ptr, "invalid width in fcTL (> 2^31-1)");
1011 + if (height > PNG_UINT_31_MAX)
1012 + png_error(png_ptr, "invalid height in fcTL (> 2^31-1)");
1013 + if (x_offset > PNG_UINT_31_MAX)
1014 + png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
1015 + if (y_offset > PNG_UINT_31_MAX)
1016 + png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
1017 + if (width + x_offset > png_ptr->first_frame_width ||
1018 + height + y_offset > png_ptr->first_frame_height)
1019 + png_error(png_ptr, "dimensions of a frame are greater than"
1020 + "the ones in IHDR");
1021 +
1022 + if (dispose_op != PNG_DISPOSE_OP_NONE &&
1023 + dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
1024 + dispose_op != PNG_DISPOSE_OP_PREVIOUS)
1025 + png_error(png_ptr, "invalid dispose_op in fcTL");
1026 +
1027 + if (blend_op != PNG_BLEND_OP_SOURCE &&
1028 + blend_op != PNG_BLEND_OP_OVER)
1029 + png_error(png_ptr, "invalid blend_op in fcTL");
1030 +
1031 + PNG_UNUSED(delay_num)
1032 + PNG_UNUSED(delay_den)
1033 +}
1034 +
1035 +png_uint_32 PNGAPI
1036 +png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
1037 + png_byte is_hidden)
1038 +{
1039 + png_debug(1, "in png_first_frame_is_hidden()");
1040 +
1041 + if (png_ptr == NULL)
1042 + return 0;
1043 +
1044 + if (is_hidden)
1045 + png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1046 + else
1047 + png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
1048 +
1049 + PNG_UNUSED(info_ptr)
1050 +
1051 + return 1;
1052 +}
1053 +#endif /* PNG_APNG_SUPPORTED */
1054 +
1055 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1056 static png_byte
1057 check_location(png_const_structrp png_ptr, int location)
1058 Index: pngrutil.c
1059 ===================================================================
1060 --- pngrutil.c
1061 +++ pngrutil.c
1062 @@ -821,6 +821,11 @@
1063 filter_type = buf[11];
1064 interlace_type = buf[12];
1066 +#ifdef PNG_READ_APNG_SUPPORTED
1067 + png_ptr->first_frame_width = width;
1068 + png_ptr->first_frame_height = height;
1069 +#endif
1070 +
1071 /* Set internal variables */
1072 png_ptr->width = width;
1073 png_ptr->height = height;
1074 @@ -2695,6 +2700,179 @@
1075 }
1076 #endif
1078 +#ifdef PNG_READ_APNG_SUPPORTED
1079 +void /* PRIVATE */
1080 +png_handle_acTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
1081 +{
1082 + png_byte data[8];
1083 + png_uint_32 num_frames;
1084 + png_uint_32 num_plays;
1085 + png_uint_32 didSet;
1086 +
1087 + png_debug(1, "in png_handle_acTL");
1088 +
1089 + if (!(png_ptr->mode & PNG_HAVE_IHDR))
1090 + {
1091 + png_error(png_ptr, "Missing IHDR before acTL");
1092 + }
1093 + else if (png_ptr->mode & PNG_HAVE_IDAT)
1094 + {
1095 + png_warning(png_ptr, "Invalid acTL after IDAT skipped");
1096 + png_crc_finish(png_ptr, length);
1097 + return;
1098 + }
1099 + else if (png_ptr->mode & PNG_HAVE_acTL)
1100 + {
1101 + png_warning(png_ptr, "Duplicate acTL skipped");
1102 + png_crc_finish(png_ptr, length);
1103 + return;
1104 + }
1105 + else if (length != 8)
1106 + {
1107 + png_warning(png_ptr, "acTL with invalid length skipped");
1108 + png_crc_finish(png_ptr, length);
1109 + return;
1110 + }
1111 +
1112 + png_crc_read(png_ptr, data, 8);
1113 + png_crc_finish(png_ptr, 0);
1114 +
1115 + num_frames = png_get_uint_31(png_ptr, data);
1116 + num_plays = png_get_uint_31(png_ptr, data + 4);
1117 +
1118 + /* the set function will do error checking on num_frames */
1119 + didSet = png_set_acTL(png_ptr, info_ptr, num_frames, num_plays);
1120 + if(didSet)
1121 + png_ptr->mode |= PNG_HAVE_acTL;
1122 +}
1123 +
1124 +void /* PRIVATE */
1125 +png_handle_fcTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
1126 +{
1127 + png_byte data[22];
1128 + png_uint_32 width;
1129 + png_uint_32 height;
1130 + png_uint_32 x_offset;
1131 + png_uint_32 y_offset;
1132 + png_uint_16 delay_num;
1133 + png_uint_16 delay_den;
1134 + png_byte dispose_op;
1135 + png_byte blend_op;
1136 +
1137 + png_debug(1, "in png_handle_fcTL");
1138 +
1139 + png_ensure_sequence_number(png_ptr, length);
1140 +
1141 + if (!(png_ptr->mode & PNG_HAVE_IHDR))
1142 + {
1143 + png_error(png_ptr, "Missing IHDR before fcTL");
1144 + }
1145 + else if (png_ptr->mode & PNG_HAVE_IDAT)
1146 + {
1147 + /* for any frames other then the first this message may be misleading,
1148 + * but correct. PNG_HAVE_IDAT is unset before the frame head is read
1149 + * i can't think of a better message */
1150 + png_warning(png_ptr, "Invalid fcTL after IDAT skipped");
1151 + png_crc_finish(png_ptr, length-4);
1152 + return;
1153 + }
1154 + else if (png_ptr->mode & PNG_HAVE_fcTL)
1155 + {
1156 + png_warning(png_ptr, "Duplicate fcTL within one frame skipped");
1157 + png_crc_finish(png_ptr, length-4);
1158 + return;
1159 + }
1160 + else if (length != 26)
1161 + {
1162 + png_warning(png_ptr, "fcTL with invalid length skipped");
1163 + png_crc_finish(png_ptr, length-4);
1164 + return;
1165 + }
1166 +
1167 + png_crc_read(png_ptr, data, 22);
1168 + png_crc_finish(png_ptr, 0);
1169 +
1170 + width = png_get_uint_31(png_ptr, data);
1171 + height = png_get_uint_31(png_ptr, data + 4);
1172 + x_offset = png_get_uint_31(png_ptr, data + 8);
1173 + y_offset = png_get_uint_31(png_ptr, data + 12);
1174 + delay_num = png_get_uint_16(data + 16);
1175 + delay_den = png_get_uint_16(data + 18);
1176 + dispose_op = data[20];
1177 + blend_op = data[21];
1178 +
1179 + if (png_ptr->num_frames_read == 0 && (x_offset != 0 || y_offset != 0))
1180 + {
1181 + png_warning(png_ptr, "fcTL for the first frame must have zero offset");
1182 + return;
1183 + }
1184 +
1185 + if (info_ptr != NULL)
1186 + {
1187 + if (png_ptr->num_frames_read == 0 &&
1188 + (width != info_ptr->width || height != info_ptr->height))
1189 + {
1190 + png_warning(png_ptr, "size in first frame's fcTL must match "
1191 + "the size in IHDR");
1192 + return;
1193 + }
1194 +
1195 + /* The set function will do more error checking */
1196 + png_set_next_frame_fcTL(png_ptr, info_ptr, width, height,
1197 + x_offset, y_offset, delay_num, delay_den,
1198 + dispose_op, blend_op);
1199 +
1200 + png_read_reinit(png_ptr, info_ptr);
1201 +
1202 + png_ptr->mode |= PNG_HAVE_fcTL;
1203 + }
1204 +}
1205 +
1206 +void /* PRIVATE */
1207 +png_have_info(png_structp png_ptr, png_infop info_ptr)
1208 +{
1209 + if((info_ptr->valid & PNG_INFO_acTL) && !(info_ptr->valid & PNG_INFO_fcTL))
1210 + {
1211 + png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1212 + info_ptr->num_frames++;
1213 + }
1214 +}
1215 +
1216 +void /* PRIVATE */
1217 +png_handle_fdAT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
1218 +{
1219 + png_ensure_sequence_number(png_ptr, length);
1220 +
1221 + /* This function is only called from png_read_end(), png_read_info(),
1222 + * and png_push_read_chunk() which means that:
1223 + * - the user doesn't want to read this frame
1224 + * - or this is an out-of-place fdAT
1225 + * in either case it is safe to ignore the chunk with a warning */
1226 + png_warning(png_ptr, "ignoring fdAT chunk");
1227 + png_crc_finish(png_ptr, length - 4);
1228 + PNG_UNUSED(info_ptr)
1229 +}
1230 +
1231 +void /* PRIVATE */
1232 +png_ensure_sequence_number(png_structp png_ptr, png_uint_32 length)
1233 +{
1234 + png_byte data[4];
1235 + png_uint_32 sequence_number;
1236 +
1237 + if (length < 4)
1238 + png_error(png_ptr, "invalid fcTL or fdAT chunk found");
1239 +
1240 + png_crc_read(png_ptr, data, 4);
1241 + sequence_number = png_get_uint_31(png_ptr, data);
1242 +
1243 + if (sequence_number != png_ptr->next_seq_num)
1244 + png_error(png_ptr, "fcTL or fdAT chunk with out-of-order sequence "
1245 + "number found");
1246 +
1247 + png_ptr->next_seq_num++;
1248 +}
1249 +#endif /* PNG_READ_APNG_SUPPORTED */
1250 +
1251 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1252 /* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */
1253 static int
1254 @@ -3952,6 +4130,38 @@
1255 uInt avail_in;
1256 png_bytep buffer;
1258 +#ifdef PNG_READ_APNG_SUPPORTED
1259 + png_uint_32 bytes_to_skip = 0;
1260 +
1261 + while (png_ptr->idat_size == 0 || bytes_to_skip != 0)
1262 + {
1263 + png_crc_finish(png_ptr, bytes_to_skip);
1264 + bytes_to_skip = 0;
1265 +
1266 + png_ptr->idat_size = png_read_chunk_header(png_ptr);
1267 + if (png_ptr->num_frames_read == 0)
1268 + {
1269 + if (png_ptr->chunk_name != png_IDAT)
1270 + png_error(png_ptr, "Not enough image data");
1271 + }
1272 + else
1273 + {
1274 + if (png_ptr->chunk_name == png_IEND)
1275 + png_error(png_ptr, "Not enough image data");
1276 + if (png_ptr->chunk_name != png_fdAT)
1277 + {
1278 + png_warning(png_ptr, "Skipped (ignored) a chunk "
1279 + "between APNG chunks");
1280 + bytes_to_skip = png_ptr->idat_size;
1281 + continue;
1282 + }
1283 +
1284 + png_ensure_sequence_number(png_ptr, png_ptr->idat_size);
1285 +
1286 + png_ptr->idat_size -= 4;
1287 + }
1288 + }
1289 +#else
1290 while (png_ptr->idat_size == 0)
1291 {
1292 png_crc_finish(png_ptr, 0);
1293 @@ -3963,6 +4173,7 @@
1294 if (png_ptr->chunk_name != png_IDAT)
1295 png_error(png_ptr, "Not enough image data");
1296 }
1297 +#endif /* PNG_READ_APNG_SUPPORTED */
1299 avail_in = png_ptr->IDAT_read_size;
1301 @@ -4026,6 +4237,9 @@
1303 png_ptr->mode |= PNG_AFTER_IDAT;
1304 png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
1305 +#ifdef PNG_READ_APNG_SUPPORTED
1306 + png_ptr->num_frames_read++;
1307 +#endif
1309 if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0)
1310 png_chunk_benign_error(png_ptr, "Extra compressed data");
1311 @@ -4471,4 +4685,80 @@
1313 png_ptr->flags |= PNG_FLAG_ROW_INIT;
1314 }
1315 +
1316 +#ifdef PNG_READ_APNG_SUPPORTED
1317 +/* This function is to be called after the main IDAT set has been read and
1318 + * before a new IDAT is read. It resets some parts of png_ptr
1319 + * to make them usable by the read functions again */
1320 +void /* PRIVATE */
1321 +png_read_reset(png_structp png_ptr)
1322 +{
1323 + png_ptr->mode &= ~PNG_HAVE_IDAT;
1324 + png_ptr->mode &= ~PNG_AFTER_IDAT;
1325 + png_ptr->row_number = 0;
1326 + png_ptr->pass = 0;
1327 +}
1328 +
1329 +void /* PRIVATE */
1330 +png_read_reinit(png_structp png_ptr, png_infop info_ptr)
1331 +{
1332 + png_ptr->width = info_ptr->next_frame_width;
1333 + png_ptr->height = info_ptr->next_frame_height;
1334 + png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,png_ptr->width);
1335 + png_ptr->info_rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,
1336 + png_ptr->width);
1337 + if (png_ptr->prev_row)
1338 + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
1339 +}
1340 +
1341 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1342 +/* same as png_read_reset() but for the progressive reader */
1343 +void /* PRIVATE */
1344 +png_progressive_read_reset(png_structp png_ptr)
1345 +{
1346 +#ifdef PNG_READ_INTERLACING_SUPPORTED
1347 + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
1348 +
1349 + /* Start of interlace block */
1350 + static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
1351 +
1352 + /* Offset to next interlace block */
1353 + static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
1354 +
1355 + /* Start of interlace block in the y direction */
1356 + static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
1357 +
1358 + /* Offset to next interlace block in the y direction */
1359 + static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
1360 +
1361 + if (png_ptr->interlaced)
1362 + {
1363 + if (!(png_ptr->transformations & PNG_INTERLACE))
1364 + png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
1365 + png_pass_ystart[0]) / png_pass_yinc[0];
1366 + else
1367 + png_ptr->num_rows = png_ptr->height;
1368 +
1369 + png_ptr->iwidth = (png_ptr->width +
1370 + png_pass_inc[png_ptr->pass] - 1 -
1371 + png_pass_start[png_ptr->pass]) /
1372 + png_pass_inc[png_ptr->pass];
1373 + }
1374 + else
1375 +#endif /* PNG_READ_INTERLACING_SUPPORTED */
1376 + {
1377 + png_ptr->num_rows = png_ptr->height;
1378 + png_ptr->iwidth = png_ptr->width;
1379 + }
1380 + png_ptr->flags &= ~PNG_FLAG_ZSTREAM_ENDED;
1381 + if (inflateReset(&(png_ptr->zstream)) != Z_OK)
1382 + png_error(png_ptr, "inflateReset failed");
1383 + png_ptr->zstream.avail_in = 0;
1384 + png_ptr->zstream.next_in = 0;
1385 + png_ptr->zstream.next_out = png_ptr->row_buf;
1386 + png_ptr->zstream.avail_out = (uInt)PNG_ROWBYTES(png_ptr->pixel_depth,
1387 + png_ptr->iwidth) + 1;
1388 +}
1389 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1390 +#endif /* PNG_READ_APNG_SUPPORTED */
1391 #endif /* PNG_READ_SUPPORTED */
1392 Index: pngwutil.c
1393 ===================================================================
1394 --- pngwutil.c
1395 +++ pngwutil.c
1396 @@ -898,6 +898,11 @@
1397 /* Write the chunk */
1398 png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
1400 +#ifdef PNG_WRITE_APNG_SUPPORTED
1401 + png_ptr->first_frame_width = width;
1402 + png_ptr->first_frame_height = height;
1403 +#endif
1404 +
1405 if (!(png_ptr->do_filter))
1406 {
1407 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
1408 @@ -1076,7 +1081,15 @@
1409 optimize_cmf(data, png_image_size(png_ptr));
1410 # endif
1412 +# ifdef PNG_WRITE_APNG_SUPPORTED
1413 + if (png_ptr->num_frames_written == 0)
1414 +# endif
1415 png_write_complete_chunk(png_ptr, png_IDAT, data, size);
1416 +# ifdef PNG_WRITE_APNG_SUPPORTED
1417 + else
1418 + png_write_fdAT(png_ptr, data, size);
1419 +# endif /* PNG_WRITE_APNG_SUPPORTED */
1420 +
1421 png_ptr->mode |= PNG_HAVE_IDAT;
1423 png_ptr->zstream.next_out = data;
1424 @@ -1122,7 +1135,15 @@
1425 optimize_cmf(data, png_image_size(png_ptr));
1426 # endif
1428 +# ifdef PNG_WRITE_APNG_SUPPORTED
1429 + if (png_ptr->num_frames_written == 0)
1430 +# endif
1431 png_write_complete_chunk(png_ptr, png_IDAT, data, size);
1432 +# ifdef PNG_WRITE_APNG_SUPPORTED
1433 + else
1434 + png_write_fdAT(png_ptr, data, size);
1435 +# endif /* PNG_WRITE_APNG_SUPPORTED */
1436 +
1437 png_ptr->zstream.avail_out = 0;
1438 png_ptr->zstream.next_out = NULL;
1439 png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;
1440 @@ -1934,6 +1955,82 @@
1441 }
1442 #endif
1444 +#ifdef PNG_WRITE_APNG_SUPPORTED
1445 +void /* PRIVATE */
1446 +png_write_acTL(png_structp png_ptr,
1447 + png_uint_32 num_frames, png_uint_32 num_plays)
1448 +{
1449 + png_byte buf[8];
1450 +
1451 + png_debug(1, "in png_write_acTL");
1452 +
1453 + png_ptr->num_frames_to_write = num_frames;
1454 +
1455 + if (png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN)
1456 + num_frames--;
1457 +
1458 + png_save_uint_32(buf, num_frames);
1459 + png_save_uint_32(buf + 4, num_plays);
1460 +
1461 + png_write_complete_chunk(png_ptr, png_acTL, buf, (png_size_t)8);
1462 +}
1463 +
1464 +void /* PRIVATE */
1465 +png_write_fcTL(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
1466 + png_uint_32 x_offset, png_uint_32 y_offset,
1467 + png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
1468 + png_byte blend_op)
1469 +{
1470 + png_byte buf[26];
1471 +
1472 + png_debug(1, "in png_write_fcTL");
1473 +
1474 + if (png_ptr->num_frames_written == 0 && (x_offset != 0 || y_offset != 0))
1475 + png_error(png_ptr, "x and/or y offset for the first frame aren't 0");
1476 + if (png_ptr->num_frames_written == 0 &&
1477 + (width != png_ptr->first_frame_width ||
1478 + height != png_ptr->first_frame_height))
1479 + png_error(png_ptr, "width and/or height in the first frame's fcTL "
1480 + "don't match the ones in IHDR");
1481 +
1482 + /* more error checking */
1483 + png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
1484 + delay_num, delay_den, dispose_op, blend_op);
1485 +
1486 + png_save_uint_32(buf, png_ptr->next_seq_num);
1487 + png_save_uint_32(buf + 4, width);
1488 + png_save_uint_32(buf + 8, height);
1489 + png_save_uint_32(buf + 12, x_offset);
1490 + png_save_uint_32(buf + 16, y_offset);
1491 + png_save_uint_16(buf + 20, delay_num);
1492 + png_save_uint_16(buf + 22, delay_den);
1493 + buf[24] = dispose_op;
1494 + buf[25] = blend_op;
1495 +
1496 + png_write_complete_chunk(png_ptr, png_fcTL, buf, (png_size_t)26);
1497 +
1498 + png_ptr->next_seq_num++;
1499 +}
1500 +
1501 +void /* PRIVATE */
1502 +png_write_fdAT(png_structp png_ptr,
1503 + png_const_bytep data, png_size_t length)
1504 +{
1505 + png_byte buf[4];
1506 +
1507 + png_write_chunk_header(png_ptr, png_fdAT, (png_uint_32)(4 + length));
1508 +
1509 + png_save_uint_32(buf, png_ptr->next_seq_num);
1510 + png_write_chunk_data(png_ptr, buf, 4);
1511 +
1512 + png_write_chunk_data(png_ptr, data, length);
1513 +
1514 + png_write_chunk_end(png_ptr);
1515 +
1516 + png_ptr->next_seq_num++;
1517 +}
1518 +#endif /* PNG_WRITE_APNG_SUPPORTED */
1519 +
1520 /* Initializes the row writing capability of libpng */
1521 void /* PRIVATE */
1522 png_write_start_row(png_structrp png_ptr)
1523 @@ -3020,4 +3117,39 @@
1524 }
1525 #endif
1526 }
1527 +
1528 +#ifdef PNG_WRITE_APNG_SUPPORTED
1529 +void /* PRIVATE */
1530 +png_write_reset(png_structp png_ptr)
1531 +{
1532 + png_ptr->row_number = 0;
1533 + png_ptr->pass = 0;
1534 + png_ptr->mode &= ~PNG_HAVE_IDAT;
1535 +}
1536 +
1537 +void /* PRIVATE */
1538 +png_write_reinit(png_structp png_ptr, png_infop info_ptr,
1539 + png_uint_32 width, png_uint_32 height)
1540 +{
1541 + if (png_ptr->num_frames_written == 0 &&
1542 + (width != png_ptr->first_frame_width ||
1543 + height != png_ptr->first_frame_height))
1544 + png_error(png_ptr, "width and/or height in the first frame's fcTL "
1545 + "don't match the ones in IHDR");
1546 + if (width > png_ptr->first_frame_width ||
1547 + height > png_ptr->first_frame_height)
1548 + png_error(png_ptr, "width and/or height for a frame greater than"
1549 + "the ones in IHDR");
1550 +
1551 + png_set_IHDR(png_ptr, info_ptr, width, height,
1552 + info_ptr->bit_depth, info_ptr->color_type,
1553 + info_ptr->interlace_type, info_ptr->compression_type,
1554 + info_ptr->filter_type);
1555 +
1556 + png_ptr->width = width;
1557 + png_ptr->height = height;
1558 + png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
1559 + png_ptr->usr_width = png_ptr->width;
1560 +}
1561 +#endif /* PNG_WRITE_APNG_SUPPORTED */
1562 #endif /* PNG_WRITE_SUPPORTED */
1563 Index: scripts/symbols.def
1564 ===================================================================
1565 --- scripts/symbols.def
1566 +++ scripts/symbols.def
1567 @@ -249,3 +249,23 @@
1568 png_set_check_for_invalid_index @242
1569 png_get_palette_max @243
1570 png_set_option @244
1571 + png_get_acTL @245
1572 + png_set_acTL @246
1573 + png_get_num_frames @247
1574 + png_get_num_plays @248
1575 + png_get_next_frame_fcTL @249
1576 + png_set_next_frame_fcTL @250
1577 + png_get_next_frame_width @251
1578 + png_get_next_frame_height @252
1579 + png_get_next_frame_x_offset @253
1580 + png_get_next_frame_y_offset @254
1581 + png_get_next_frame_delay_num @255
1582 + png_get_next_frame_delay_den @256
1583 + png_get_next_frame_dispose_op @257
1584 + png_get_next_frame_blend_op @258
1585 + png_get_first_frame_is_hidden @259
1586 + png_set_first_frame_is_hidden @260
1587 + png_read_frame_head @261
1588 + png_set_progressive_frame_fn @262
1589 + png_write_frame_head @263
1590 + png_write_frame_tail @264