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pngwrite.c
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1
2 /* pngwrite.c - general routines to write a PNG file
3 *
4 * Last changed in libpng 1.5.1 [February 3, 2011]
5 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 */
13
14 #include "pngpriv.h"
15
16 #ifdef PNG_WRITE_SUPPORTED
17
18 /* Writes all the PNG information. This is the suggested way to use the
19 * library. If you have a new chunk to add, make a function to write it,
20 * and put it in the correct location here. If you want the chunk written
21 * after the image data, put it in png_write_end(). I strongly encourage
22 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
23 * the chunk, as that will keep the code from breaking if you want to just
24 * write a plain PNG file. If you have long comments, I suggest writing
25 * them in png_write_end(), and compressing them.
26 */
27 void PNGAPI
28 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
29 {
30 png_debug(1, "in png_write_info_before_PLTE");
31
32 if (png_ptr == NULL || info_ptr == NULL)
33 return;
34
35 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
36 {
37 /* Write PNG signature */
38 png_write_sig(png_ptr);
39
40 #ifdef PNG_MNG_FEATURES_SUPPORTED
41 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \
42 (png_ptr->mng_features_permitted))
43 {
44 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
45 png_ptr->mng_features_permitted = 0;
46 }
47 #endif
48
49 /* Write IHDR information. */
50 png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
51 info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
52 info_ptr->filter_type,
53 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
54 info_ptr->interlace_type);
55 #else
56 0);
57 #endif
58 /* The rest of these check to see if the valid field has the appropriate
59 * flag set, and if it does, writes the chunk.
60 */
61 #ifdef PNG_WRITE_gAMA_SUPPORTED
62 if (info_ptr->valid & PNG_INFO_gAMA)
63 png_write_gAMA_fixed(png_ptr, info_ptr->gamma);
64 #endif
65 #ifdef PNG_WRITE_sRGB_SUPPORTED
66 if (info_ptr->valid & PNG_INFO_sRGB)
67 png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
68 #endif
69
70 #ifdef PNG_WRITE_iCCP_SUPPORTED
71 if (info_ptr->valid & PNG_INFO_iCCP)
72 png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
73 (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
74 #endif
75 #ifdef PNG_WRITE_sBIT_SUPPORTED
76 if (info_ptr->valid & PNG_INFO_sBIT)
77 png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
78 #endif
79 #ifdef PNG_WRITE_cHRM_SUPPORTED
80 if (info_ptr->valid & PNG_INFO_cHRM)
81 png_write_cHRM_fixed(png_ptr,
82 info_ptr->x_white, info_ptr->y_white,
83 info_ptr->x_red, info_ptr->y_red,
84 info_ptr->x_green, info_ptr->y_green,
85 info_ptr->x_blue, info_ptr->y_blue);
86 #endif
87
88 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
89 if (info_ptr->unknown_chunks_num)
90 {
91 png_unknown_chunk *up;
92
93 png_debug(5, "writing extra chunks");
94
95 for (up = info_ptr->unknown_chunks;
96 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
97 up++)
98 {
99 int keep = png_handle_as_unknown(png_ptr, up->name);
100
101 if (keep != PNG_HANDLE_CHUNK_NEVER &&
102 up->location && !(up->location & PNG_HAVE_PLTE) &&
103 !(up->location & PNG_HAVE_IDAT) &&
104 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
105 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
106 {
107 if (up->size == 0)
108 png_warning(png_ptr, "Writing zero-length unknown chunk");
109
110 png_write_chunk(png_ptr, up->name, up->data, up->size);
111 }
112 }
113 }
114 #endif
115 png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
116 }
117 }
118
119 void PNGAPI
120 png_write_info(png_structp png_ptr, png_infop info_ptr)
121 {
122 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
123 int i;
124 #endif
125
126 png_debug(1, "in png_write_info");
127
128 if (png_ptr == NULL || info_ptr == NULL)
129 return;
130
131 png_write_info_before_PLTE(png_ptr, info_ptr);
132
133 if (info_ptr->valid & PNG_INFO_PLTE)
134 png_write_PLTE(png_ptr, info_ptr->palette,
135 (png_uint_32)info_ptr->num_palette);
136
137 else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
138 png_error(png_ptr, "Valid palette required for paletted images");
139
140 #ifdef PNG_WRITE_tRNS_SUPPORTED
141 if (info_ptr->valid & PNG_INFO_tRNS)
142 {
143 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
144 /* Invert the alpha channel (in tRNS) */
145 if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
146 info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
147 {
148 int j;
149 for (j = 0; j<(int)info_ptr->num_trans; j++)
150 info_ptr->trans_alpha[j] =
151 (png_byte)(255 - info_ptr->trans_alpha[j]);
152 }
153 #endif
154 png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
155 info_ptr->num_trans, info_ptr->color_type);
156 }
157 #endif
158 #ifdef PNG_WRITE_bKGD_SUPPORTED
159 if (info_ptr->valid & PNG_INFO_bKGD)
160 png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
161 #endif
162
163 #ifdef PNG_WRITE_hIST_SUPPORTED
164 if (info_ptr->valid & PNG_INFO_hIST)
165 png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
166 #endif
167
168 #ifdef PNG_WRITE_oFFs_SUPPORTED
169 if (info_ptr->valid & PNG_INFO_oFFs)
170 png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
171 info_ptr->offset_unit_type);
172 #endif
173
174 #ifdef PNG_WRITE_pCAL_SUPPORTED
175 if (info_ptr->valid & PNG_INFO_pCAL)
176 png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
177 info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
178 info_ptr->pcal_units, info_ptr->pcal_params);
179 #endif
180
181 #ifdef PNG_WRITE_sCAL_SUPPORTED
182 if (info_ptr->valid & PNG_INFO_sCAL)
183 png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
184 info_ptr->scal_s_width, info_ptr->scal_s_height);
185 #endif /* sCAL */
186
187 #ifdef PNG_WRITE_pHYs_SUPPORTED
188 if (info_ptr->valid & PNG_INFO_pHYs)
189 png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
190 info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
191 #endif /* pHYs */
192
193 #ifdef PNG_WRITE_tIME_SUPPORTED
194 if (info_ptr->valid & PNG_INFO_tIME)
195 {
196 png_write_tIME(png_ptr, &(info_ptr->mod_time));
197 png_ptr->mode |= PNG_WROTE_tIME;
198 }
199 #endif /* tIME */
200
201 #ifdef PNG_WRITE_sPLT_SUPPORTED
202 if (info_ptr->valid & PNG_INFO_sPLT)
203 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
204 png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
205 #endif /* sPLT */
206
207 #ifdef PNG_WRITE_TEXT_SUPPORTED
208 /* Check to see if we need to write text chunks */
209 for (i = 0; i < info_ptr->num_text; i++)
210 {
211 png_debug2(2, "Writing header text chunk %d, type %d", i,
212 info_ptr->text[i].compression);
213 /* An internationalized chunk? */
214 if (info_ptr->text[i].compression > 0)
215 {
216 #ifdef PNG_WRITE_iTXt_SUPPORTED
217 /* Write international chunk */
218 png_write_iTXt(png_ptr,
219 info_ptr->text[i].compression,
220 info_ptr->text[i].key,
221 info_ptr->text[i].lang,
222 info_ptr->text[i].lang_key,
223 info_ptr->text[i].text);
224 #else
225 png_warning(png_ptr, "Unable to write international text");
226 #endif
227 /* Mark this chunk as written */
228 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
229 }
230
231 /* If we want a compressed text chunk */
232 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
233 {
234 #ifdef PNG_WRITE_zTXt_SUPPORTED
235 /* Write compressed chunk */
236 png_write_zTXt(png_ptr, info_ptr->text[i].key,
237 info_ptr->text[i].text, 0,
238 info_ptr->text[i].compression);
239 #else
240 png_warning(png_ptr, "Unable to write compressed text");
241 #endif
242 /* Mark this chunk as written */
243 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
244 }
245
246 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
247 {
248 #ifdef PNG_WRITE_tEXt_SUPPORTED
249 /* Write uncompressed chunk */
250 png_write_tEXt(png_ptr, info_ptr->text[i].key,
251 info_ptr->text[i].text,
252 0);
253 /* Mark this chunk as written */
254 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
255 #else
256 /* Can't get here */
257 png_warning(png_ptr, "Unable to write uncompressed text");
258 #endif
259 }
260 }
261 #endif /* tEXt */
262
263 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
264 if (info_ptr->unknown_chunks_num)
265 {
266 png_unknown_chunk *up;
267
268 png_debug(5, "writing extra chunks");
269
270 for (up = info_ptr->unknown_chunks;
271 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
272 up++)
273 {
274 int keep = png_handle_as_unknown(png_ptr, up->name);
275 if (keep != PNG_HANDLE_CHUNK_NEVER &&
276 up->location && (up->location & PNG_HAVE_PLTE) &&
277 !(up->location & PNG_HAVE_IDAT) &&
278 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
279 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
280 {
281 png_write_chunk(png_ptr, up->name, up->data, up->size);
282 }
283 }
284 }
285 #endif
286 }
287
288 /* Writes the end of the PNG file. If you don't want to write comments or
289 * time information, you can pass NULL for info. If you already wrote these
290 * in png_write_info(), do not write them again here. If you have long
291 * comments, I suggest writing them here, and compressing them.
292 */
293 void PNGAPI
294 png_write_end(png_structp png_ptr, png_infop info_ptr)
295 {
296 png_debug(1, "in png_write_end");
297
298 if (png_ptr == NULL)
299 return;
300
301 if (!(png_ptr->mode & PNG_HAVE_IDAT))
302 png_error(png_ptr, "No IDATs written into file");
303
304 /* See if user wants us to write information chunks */
305 if (info_ptr != NULL)
306 {
307 #ifdef PNG_WRITE_TEXT_SUPPORTED
308 int i; /* local index variable */
309 #endif
310 #ifdef PNG_WRITE_tIME_SUPPORTED
311 /* Check to see if user has supplied a time chunk */
312 if ((info_ptr->valid & PNG_INFO_tIME) &&
313 !(png_ptr->mode & PNG_WROTE_tIME))
314 png_write_tIME(png_ptr, &(info_ptr->mod_time));
315
316 #endif
317 #ifdef PNG_WRITE_TEXT_SUPPORTED
318 /* Loop through comment chunks */
319 for (i = 0; i < info_ptr->num_text; i++)
320 {
321 png_debug2(2, "Writing trailer text chunk %d, type %d", i,
322 info_ptr->text[i].compression);
323 /* An internationalized chunk? */
324 if (info_ptr->text[i].compression > 0)
325 {
326 #ifdef PNG_WRITE_iTXt_SUPPORTED
327 /* Write international chunk */
328 png_write_iTXt(png_ptr,
329 info_ptr->text[i].compression,
330 info_ptr->text[i].key,
331 info_ptr->text[i].lang,
332 info_ptr->text[i].lang_key,
333 info_ptr->text[i].text);
334 #else
335 png_warning(png_ptr, "Unable to write international text");
336 #endif
337 /* Mark this chunk as written */
338 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
339 }
340
341 else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
342 {
343 #ifdef PNG_WRITE_zTXt_SUPPORTED
344 /* Write compressed chunk */
345 png_write_zTXt(png_ptr, info_ptr->text[i].key,
346 info_ptr->text[i].text, 0,
347 info_ptr->text[i].compression);
348 #else
349 png_warning(png_ptr, "Unable to write compressed text");
350 #endif
351 /* Mark this chunk as written */
352 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
353 }
354
355 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
356 {
357 #ifdef PNG_WRITE_tEXt_SUPPORTED
358 /* Write uncompressed chunk */
359 png_write_tEXt(png_ptr, info_ptr->text[i].key,
360 info_ptr->text[i].text, 0);
361 #else
362 png_warning(png_ptr, "Unable to write uncompressed text");
363 #endif
364
365 /* Mark this chunk as written */
366 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
367 }
368 }
369 #endif
370 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
371 if (info_ptr->unknown_chunks_num)
372 {
373 png_unknown_chunk *up;
374
375 png_debug(5, "writing extra chunks");
376
377 for (up = info_ptr->unknown_chunks;
378 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
379 up++)
380 {
381 int keep = png_handle_as_unknown(png_ptr, up->name);
382 if (keep != PNG_HANDLE_CHUNK_NEVER &&
383 up->location && (up->location & PNG_AFTER_IDAT) &&
384 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
385 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
386 {
387 png_write_chunk(png_ptr, up->name, up->data, up->size);
388 }
389 }
390 }
391 #endif
392 }
393
394 png_ptr->mode |= PNG_AFTER_IDAT;
395
396 /* Write end of PNG file */
397 png_write_IEND(png_ptr);
398 /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
399 * and restored again in libpng-1.2.30, may cause some applications that
400 * do not set png_ptr->output_flush_fn to crash. If your application
401 * experiences a problem, please try building libpng with
402 * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
403 * png-mng-implement at lists.sf.net .
404 */
405 #ifdef PNG_WRITE_FLUSH_SUPPORTED
406 # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
407 png_flush(png_ptr);
408 # endif
409 #endif
410 }
411
412 #ifdef PNG_CONVERT_tIME_SUPPORTED
413 /* "tm" structure is not supported on WindowsCE */
414 void PNGAPI
415 png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime)
416 {
417 png_debug(1, "in png_convert_from_struct_tm");
418
419 ptime->year = (png_uint_16)(1900 + ttime->tm_year);
420 ptime->month = (png_byte)(ttime->tm_mon + 1);
421 ptime->day = (png_byte)ttime->tm_mday;
422 ptime->hour = (png_byte)ttime->tm_hour;
423 ptime->minute = (png_byte)ttime->tm_min;
424 ptime->second = (png_byte)ttime->tm_sec;
425 }
426
427 void PNGAPI
428 png_convert_from_time_t(png_timep ptime, time_t ttime)
429 {
430 struct tm *tbuf;
431
432 png_debug(1, "in png_convert_from_time_t");
433
434 tbuf = gmtime(&ttime);
435 png_convert_from_struct_tm(ptime, tbuf);
436 }
437 #endif
438
439 /* Initialize png_ptr structure, and allocate any memory needed */
440 PNG_FUNCTION(png_structp,PNGAPI
441 png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
442 png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
443 {
444 #ifdef PNG_USER_MEM_SUPPORTED
445 return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
446 warn_fn, NULL, NULL, NULL));
447 }
448
449 /* Alternate initialize png_ptr structure, and allocate any memory needed */
450 static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */
451
452 PNG_FUNCTION(png_structp,PNGAPI
453 png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
454 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
455 png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
456 {
457 #endif /* PNG_USER_MEM_SUPPORTED */
458 volatile int png_cleanup_needed = 0;
459 #ifdef PNG_SETJMP_SUPPORTED
460 volatile
461 #endif
462 png_structp png_ptr;
463 #ifdef PNG_SETJMP_SUPPORTED
464 #ifdef USE_FAR_KEYWORD
465 jmp_buf png_jmpbuf;
466 #endif
467 #endif
468 int i;
469
470 png_debug(1, "in png_create_write_struct");
471
472 #ifdef PNG_USER_MEM_SUPPORTED
473 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
474 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
475 #else
476 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
477 #endif /* PNG_USER_MEM_SUPPORTED */
478 if (png_ptr == NULL)
479 return (NULL);
480
481 /* Added at libpng-1.2.6 */
482 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
483 png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
484 png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
485 #endif
486
487 #ifdef PNG_SETJMP_SUPPORTED
488 /* Applications that neglect to set up their own setjmp() and then
489 encounter a png_error() will longjmp here. Since the jmpbuf is
490 then meaningless we abort instead of returning. */
491 #ifdef USE_FAR_KEYWORD
492 if (setjmp(png_jmpbuf))
493 #else
494 if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */
495 #endif
496 #ifdef USE_FAR_KEYWORD
497 png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf));
498 #endif
499 PNG_ABORT();
500 #endif
501
502 #ifdef PNG_USER_MEM_SUPPORTED
503 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
504 #endif /* PNG_USER_MEM_SUPPORTED */
505 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
506
507 if (user_png_ver)
508 {
509 i = 0;
510 do
511 {
512 if (user_png_ver[i] != png_libpng_ver[i])
513 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
514 } while (png_libpng_ver[i++]);
515 }
516
517 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
518 {
519 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
520 * we must recompile any applications that use any older library version.
521 * For versions after libpng 1.0, we will be compatible, so we need
522 * only check the first digit.
523 */
524 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
525 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
526 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
527 {
528 #ifdef PNG_CONSOLE_IO_SUPPORTED
529 char msg[80];
530
531 if (user_png_ver)
532 {
533 png_snprintf2(msg, 80,
534 "Application built with libpng-%.20s"
535 " but running with %.20s",
536 user_png_ver,
537 png_libpng_ver);
538 png_warning(png_ptr, msg);
539 }
540 #else
541 png_warning(png_ptr,
542 "Incompatible libpng version in application and library");
543 #endif
544 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
545 png_ptr->flags = 0;
546 #endif
547 png_cleanup_needed = 1;
548 }
549 }
550
551 /* Initialize zbuf - compression buffer */
552 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
553
554 if (!png_cleanup_needed)
555 {
556 png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
557 png_ptr->zbuf_size);
558 if (png_ptr->zbuf == NULL)
559 png_cleanup_needed = 1;
560 }
561
562 if (png_cleanup_needed)
563 {
564 /* Clean up PNG structure and deallocate any memory. */
565 png_free(png_ptr, png_ptr->zbuf);
566 png_ptr->zbuf = NULL;
567 #ifdef PNG_USER_MEM_SUPPORTED
568 png_destroy_struct_2((png_voidp)png_ptr,
569 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
570 #else
571 png_destroy_struct((png_voidp)png_ptr);
572 #endif
573 return (NULL);
574 }
575
576 png_set_write_fn(png_ptr, NULL, NULL, NULL);
577
578 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
579 png_reset_filter_heuristics(png_ptr);
580 #endif
581
582 return (png_ptr);
583 }
584
585
586 /* Write a few rows of image data. If the image is interlaced,
587 * either you will have to write the 7 sub images, or, if you
588 * have called png_set_interlace_handling(), you will have to
589 * "write" the image seven times.
590 */
591 void PNGAPI
592 png_write_rows(png_structp png_ptr, png_bytepp row,
593 png_uint_32 num_rows)
594 {
595 png_uint_32 i; /* row counter */
596 png_bytepp rp; /* row pointer */
597
598 png_debug(1, "in png_write_rows");
599
600 if (png_ptr == NULL)
601 return;
602
603 /* Loop through the rows */
604 for (i = 0, rp = row; i < num_rows; i++, rp++)
605 {
606 png_write_row(png_ptr, *rp);
607 }
608 }
609
610 /* Write the image. You only need to call this function once, even
611 * if you are writing an interlaced image.
612 */
613 void PNGAPI
614 png_write_image(png_structp png_ptr, png_bytepp image)
615 {
616 png_uint_32 i; /* row index */
617 int pass, num_pass; /* pass variables */
618 png_bytepp rp; /* points to current row */
619
620 if (png_ptr == NULL)
621 return;
622
623 png_debug(1, "in png_write_image");
624
625 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
626 /* Initialize interlace handling. If image is not interlaced,
627 * this will set pass to 1
628 */
629 num_pass = png_set_interlace_handling(png_ptr);
630 #else
631 num_pass = 1;
632 #endif
633 /* Loop through passes */
634 for (pass = 0; pass < num_pass; pass++)
635 {
636 /* Loop through image */
637 for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
638 {
639 png_write_row(png_ptr, *rp);
640 }
641 }
642 }
643
644 /* Called by user to write a row of image data */
645 void PNGAPI
646 png_write_row(png_structp png_ptr, png_const_bytep row)
647 {
648 if (png_ptr == NULL)
649 return;
650
651 png_debug2(1, "in png_write_row (row %u, pass %d)",
652 png_ptr->row_number, png_ptr->pass);
653
654 /* Initialize transformations and other stuff if first time */
655 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
656 {
657 /* Make sure we wrote the header info */
658 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
659 png_error(png_ptr,
660 "png_write_info was never called before png_write_row");
661
662 /* Check for transforms that have been set but were defined out */
663 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
664 if (png_ptr->transformations & PNG_INVERT_MONO)
665 png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined");
666 #endif
667
668 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
669 if (png_ptr->transformations & PNG_FILLER)
670 png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined");
671 #endif
672 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
673 defined(PNG_READ_PACKSWAP_SUPPORTED)
674 if (png_ptr->transformations & PNG_PACKSWAP)
675 png_warning(png_ptr,
676 "PNG_WRITE_PACKSWAP_SUPPORTED is not defined");
677 #endif
678
679 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
680 if (png_ptr->transformations & PNG_PACK)
681 png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined");
682 #endif
683
684 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
685 if (png_ptr->transformations & PNG_SHIFT)
686 png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined");
687 #endif
688
689 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
690 if (png_ptr->transformations & PNG_BGR)
691 png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined");
692 #endif
693
694 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
695 if (png_ptr->transformations & PNG_SWAP_BYTES)
696 png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined");
697 #endif
698
699 png_write_start_row(png_ptr);
700 }
701
702 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
703 /* If interlaced and not interested in row, return */
704 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
705 {
706 switch (png_ptr->pass)
707 {
708 case 0:
709 if (png_ptr->row_number & 0x07)
710 {
711 png_write_finish_row(png_ptr);
712 return;
713 }
714 break;
715
716 case 1:
717 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
718 {
719 png_write_finish_row(png_ptr);
720 return;
721 }
722 break;
723
724 case 2:
725 if ((png_ptr->row_number & 0x07) != 4)
726 {
727 png_write_finish_row(png_ptr);
728 return;
729 }
730 break;
731
732 case 3:
733 if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
734 {
735 png_write_finish_row(png_ptr);
736 return;
737 }
738 break;
739
740 case 4:
741 if ((png_ptr->row_number & 0x03) != 2)
742 {
743 png_write_finish_row(png_ptr);
744 return;
745 }
746 break;
747
748 case 5:
749 if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
750 {
751 png_write_finish_row(png_ptr);
752 return;
753 }
754 break;
755
756 case 6:
757 if (!(png_ptr->row_number & 0x01))
758 {
759 png_write_finish_row(png_ptr);
760 return;
761 }
762 break;
763
764 default: /* error: ignore it */
765 break;
766 }
767 }
768 #endif
769
770 /* Set up row info for transformations */
771 png_ptr->row_info.color_type = png_ptr->color_type;
772 png_ptr->row_info.width = png_ptr->usr_width;
773 png_ptr->row_info.channels = png_ptr->usr_channels;
774 png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
775 png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
776 png_ptr->row_info.channels);
777
778 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
779 png_ptr->row_info.width);
780
781 png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
782 png_debug1(3, "row_info->width = %u", png_ptr->row_info.width);
783 png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
784 png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
785 png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
786 png_debug1(3, "row_info->rowbytes = %lu",
787 (unsigned long)png_ptr->row_info.rowbytes);
788
789 /* Copy user's row into buffer, leaving room for filter byte. */
790 png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
791
792 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
793 /* Handle interlacing */
794 if (png_ptr->interlaced && png_ptr->pass < 6 &&
795 (png_ptr->transformations & PNG_INTERLACE))
796 {
797 png_do_write_interlace(&(png_ptr->row_info),
798 png_ptr->row_buf + 1, png_ptr->pass);
799 /* This should always get caught above, but still ... */
800 if (!(png_ptr->row_info.width))
801 {
802 png_write_finish_row(png_ptr);
803 return;
804 }
805 }
806 #endif
807
808 /* Handle other transformations */
809 if (png_ptr->transformations)
810 png_do_write_transformations(png_ptr);
811
812 #ifdef PNG_MNG_FEATURES_SUPPORTED
813 /* Write filter_method 64 (intrapixel differencing) only if
814 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
815 * 2. Libpng did not write a PNG signature (this filter_method is only
816 * used in PNG datastreams that are embedded in MNG datastreams) and
817 * 3. The application called png_permit_mng_features with a mask that
818 * included PNG_FLAG_MNG_FILTER_64 and
819 * 4. The filter_method is 64 and
820 * 5. The color_type is RGB or RGBA
821 */
822 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
823 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
824 {
825 /* Intrapixel differencing */
826 png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
827 }
828 #endif
829
830 /* Find a filter if necessary, filter the row and write it out. */
831 png_write_find_filter(png_ptr, &(png_ptr->row_info));
832
833 if (png_ptr->write_row_fn != NULL)
834 (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
835 }
836
837 #ifdef PNG_WRITE_FLUSH_SUPPORTED
838 /* Set the automatic flush interval or 0 to turn flushing off */
839 void PNGAPI
840 png_set_flush(png_structp png_ptr, int nrows)
841 {
842 png_debug(1, "in png_set_flush");
843
844 if (png_ptr == NULL)
845 return;
846
847 png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
848 }
849
850 /* Flush the current output buffers now */
851 void PNGAPI
852 png_write_flush(png_structp png_ptr)
853 {
854 int wrote_IDAT;
855
856 png_debug(1, "in png_write_flush");
857
858 if (png_ptr == NULL)
859 return;
860
861 /* We have already written out all of the data */
862 if (png_ptr->row_number >= png_ptr->num_rows)
863 return;
864
865 do
866 {
867 int ret;
868
869 /* Compress the data */
870 ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
871 wrote_IDAT = 0;
872
873 /* Check for compression errors */
874 if (ret != Z_OK)
875 {
876 if (png_ptr->zstream.msg != NULL)
877 png_error(png_ptr, png_ptr->zstream.msg);
878
879 else
880 png_error(png_ptr, "zlib error");
881 }
882
883 if (!(png_ptr->zstream.avail_out))
884 {
885 /* Write the IDAT and reset the zlib output buffer */
886 png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
887 png_ptr->zstream.next_out = png_ptr->zbuf;
888 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
889 wrote_IDAT = 1;
890 }
891 } while (wrote_IDAT == 1);
892
893 /* If there is any data left to be output, write it into a new IDAT */
894 if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
895 {
896 /* Write the IDAT and reset the zlib output buffer */
897 png_write_IDAT(png_ptr, png_ptr->zbuf,
898 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
899 png_ptr->zstream.next_out = png_ptr->zbuf;
900 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
901 }
902 png_ptr->flush_rows = 0;
903 png_flush(png_ptr);
904 }
905 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
906
907 /* Free all memory used by the write */
908 void PNGAPI
909 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
910 {
911 png_structp png_ptr = NULL;
912 png_infop info_ptr = NULL;
913 #ifdef PNG_USER_MEM_SUPPORTED
914 png_free_ptr free_fn = NULL;
915 png_voidp mem_ptr = NULL;
916 #endif
917
918 png_debug(1, "in png_destroy_write_struct");
919
920 if (png_ptr_ptr != NULL)
921 {
922 png_ptr = *png_ptr_ptr;
923 #ifdef PNG_USER_MEM_SUPPORTED
924 free_fn = png_ptr->free_fn;
925 mem_ptr = png_ptr->mem_ptr;
926 #endif
927 }
928
929 #ifdef PNG_USER_MEM_SUPPORTED
930 if (png_ptr != NULL)
931 {
932 free_fn = png_ptr->free_fn;
933 mem_ptr = png_ptr->mem_ptr;
934 }
935 #endif
936
937 if (info_ptr_ptr != NULL)
938 info_ptr = *info_ptr_ptr;
939
940 if (info_ptr != NULL)
941 {
942 if (png_ptr != NULL)
943 {
944 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
945
946 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
947 if (png_ptr->num_chunk_list)
948 {
949 png_free(png_ptr, png_ptr->chunk_list);
950 png_ptr->num_chunk_list = 0;
951 }
952 #endif
953 }
954
955 #ifdef PNG_USER_MEM_SUPPORTED
956 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
957 (png_voidp)mem_ptr);
958 #else
959 png_destroy_struct((png_voidp)info_ptr);
960 #endif
961 *info_ptr_ptr = NULL;
962 }
963
964 if (png_ptr != NULL)
965 {
966 png_write_destroy(png_ptr);
967 #ifdef PNG_USER_MEM_SUPPORTED
968 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
969 (png_voidp)mem_ptr);
970 #else
971 png_destroy_struct((png_voidp)png_ptr);
972 #endif
973 *png_ptr_ptr = NULL;
974 }
975 }
976
977
978 /* Free any memory used in png_ptr struct (old method) */
979 void /* PRIVATE */
980 png_write_destroy(png_structp png_ptr)
981 {
982 #ifdef PNG_SETJMP_SUPPORTED
983 jmp_buf tmp_jmp; /* Save jump buffer */
984 #endif
985 png_error_ptr error_fn;
986 png_error_ptr warning_fn;
987 png_voidp error_ptr;
988 #ifdef PNG_USER_MEM_SUPPORTED
989 png_free_ptr free_fn;
990 #endif
991
992 png_debug(1, "in png_write_destroy");
993
994 /* Free any memory zlib uses */
995 deflateEnd(&png_ptr->zstream);
996
997 /* Free our memory. png_free checks NULL for us. */
998 png_free(png_ptr, png_ptr->zbuf);
999 png_free(png_ptr, png_ptr->row_buf);
1000 #ifdef PNG_WRITE_FILTER_SUPPORTED
1001 png_free(png_ptr, png_ptr->prev_row);
1002 png_free(png_ptr, png_ptr->sub_row);
1003 png_free(png_ptr, png_ptr->up_row);
1004 png_free(png_ptr, png_ptr->avg_row);
1005 png_free(png_ptr, png_ptr->paeth_row);
1006 #endif
1007
1008 #ifdef PNG_TIME_RFC1123_SUPPORTED
1009 png_free(png_ptr, png_ptr->time_buffer);
1010 #endif
1011
1012 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1013 /* Use this to save a little code space, it doesn't free the filter_costs */
1014 png_reset_filter_heuristics(png_ptr);
1015 png_free(png_ptr, png_ptr->filter_costs);
1016 png_free(png_ptr, png_ptr->inv_filter_costs);
1017 #endif
1018
1019 #ifdef PNG_SETJMP_SUPPORTED
1020 /* Reset structure */
1021 png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
1022 #endif
1023
1024 error_fn = png_ptr->error_fn;
1025 warning_fn = png_ptr->warning_fn;
1026 error_ptr = png_ptr->error_ptr;
1027 #ifdef PNG_USER_MEM_SUPPORTED
1028 free_fn = png_ptr->free_fn;
1029 #endif
1030
1031 png_memset(png_ptr, 0, png_sizeof(png_struct));
1032
1033 png_ptr->error_fn = error_fn;
1034 png_ptr->warning_fn = warning_fn;
1035 png_ptr->error_ptr = error_ptr;
1036 #ifdef PNG_USER_MEM_SUPPORTED
1037 png_ptr->free_fn = free_fn;
1038 #endif
1039
1040 #ifdef PNG_SETJMP_SUPPORTED
1041 png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1042 #endif
1043 }
1044
1045 /* Allow the application to select one or more row filters to use. */
1046 void PNGAPI
1047 png_set_filter(png_structp png_ptr, int method, int filters)
1048 {
1049 png_debug(1, "in png_set_filter");
1050
1051 if (png_ptr == NULL)
1052 return;
1053
1054 #ifdef PNG_MNG_FEATURES_SUPPORTED
1055 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
1056 (method == PNG_INTRAPIXEL_DIFFERENCING))
1057 method = PNG_FILTER_TYPE_BASE;
1058
1059 #endif
1060 if (method == PNG_FILTER_TYPE_BASE)
1061 {
1062 switch (filters & (PNG_ALL_FILTERS | 0x07))
1063 {
1064 #ifdef PNG_WRITE_FILTER_SUPPORTED
1065 case 5:
1066 case 6:
1067 case 7: png_warning(png_ptr, "Unknown row filter for method 0");
1068 #endif /* PNG_WRITE_FILTER_SUPPORTED */
1069 case PNG_FILTER_VALUE_NONE:
1070 png_ptr->do_filter = PNG_FILTER_NONE; break;
1071
1072 #ifdef PNG_WRITE_FILTER_SUPPORTED
1073 case PNG_FILTER_VALUE_SUB:
1074 png_ptr->do_filter = PNG_FILTER_SUB; break;
1075
1076 case PNG_FILTER_VALUE_UP:
1077 png_ptr->do_filter = PNG_FILTER_UP; break;
1078
1079 case PNG_FILTER_VALUE_AVG:
1080 png_ptr->do_filter = PNG_FILTER_AVG; break;
1081
1082 case PNG_FILTER_VALUE_PAETH:
1083 png_ptr->do_filter = PNG_FILTER_PAETH; break;
1084
1085 default:
1086 png_ptr->do_filter = (png_byte)filters; break;
1087 #else
1088 default:
1089 png_warning(png_ptr, "Unknown row filter for method 0");
1090 #endif /* PNG_WRITE_FILTER_SUPPORTED */
1091 }
1092
1093 /* If we have allocated the row_buf, this means we have already started
1094 * with the image and we should have allocated all of the filter buffers
1095 * that have been selected. If prev_row isn't already allocated, then
1096 * it is too late to start using the filters that need it, since we
1097 * will be missing the data in the previous row. If an application
1098 * wants to start and stop using particular filters during compression,
1099 * it should start out with all of the filters, and then add and
1100 * remove them after the start of compression.
1101 */
1102 if (png_ptr->row_buf != NULL)
1103 {
1104 #ifdef PNG_WRITE_FILTER_SUPPORTED
1105 if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
1106 {
1107 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
1108 (png_ptr->rowbytes + 1));
1109 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
1110 }
1111
1112 if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
1113 {
1114 if (png_ptr->prev_row == NULL)
1115 {
1116 png_warning(png_ptr, "Can't add Up filter after starting");
1117 png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
1118 ~PNG_FILTER_UP);
1119 }
1120
1121 else
1122 {
1123 png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
1124 (png_ptr->rowbytes + 1));
1125 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
1126 }
1127 }
1128
1129 if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
1130 {
1131 if (png_ptr->prev_row == NULL)
1132 {
1133 png_warning(png_ptr, "Can't add Average filter after starting");
1134 png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
1135 ~PNG_FILTER_AVG);
1136 }
1137
1138 else
1139 {
1140 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
1141 (png_ptr->rowbytes + 1));
1142 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
1143 }
1144 }
1145
1146 if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
1147 png_ptr->paeth_row == NULL)
1148 {
1149 if (png_ptr->prev_row == NULL)
1150 {
1151 png_warning(png_ptr, "Can't add Paeth filter after starting");
1152 png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
1153 }
1154
1155 else
1156 {
1157 png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
1158 (png_ptr->rowbytes + 1));
1159 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
1160 }
1161 }
1162
1163 if (png_ptr->do_filter == PNG_NO_FILTERS)
1164 #endif /* PNG_WRITE_FILTER_SUPPORTED */
1165 png_ptr->do_filter = PNG_FILTER_NONE;
1166 }
1167 }
1168 else
1169 png_error(png_ptr, "Unknown custom filter method");
1170 }
1171
1172 /* This allows us to influence the way in which libpng chooses the "best"
1173 * filter for the current scanline. While the "minimum-sum-of-absolute-
1174 * differences metric is relatively fast and effective, there is some
1175 * question as to whether it can be improved upon by trying to keep the
1176 * filtered data going to zlib more consistent, hopefully resulting in
1177 * better compression.
1178 */
1179 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
1180 /* Conveneince reset API. */
1181 static void
1182 png_reset_filter_heuristics(png_structp png_ptr)
1183 {
1184 /* Clear out any old values in the 'weights' - this must be done because if
1185 * the app calls set_filter_heuristics multiple times with different
1186 * 'num_weights' values we would otherwise potentially have wrong sized
1187 * arrays.
1188 */
1189 png_ptr->num_prev_filters = 0;
1190 png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
1191 if (png_ptr->prev_filters != NULL)
1192 {
1193 png_bytep old = png_ptr->prev_filters;
1194 png_ptr->prev_filters = NULL;
1195 png_free(png_ptr, old);
1196 }
1197 if (png_ptr->filter_weights != NULL)
1198 {
1199 png_uint_16p old = png_ptr->filter_weights;
1200 png_ptr->filter_weights = NULL;
1201 png_free(png_ptr, old);
1202 }
1203
1204 if (png_ptr->inv_filter_weights != NULL)
1205 {
1206 png_uint_16p old = png_ptr->inv_filter_weights;
1207 png_ptr->inv_filter_weights = NULL;
1208 png_free(png_ptr, old);
1209 }
1210
1211 /* Leave the filter_costs - this array is fixed size. */
1212 }
1213
1214 static int
1215 png_init_filter_heuristics(png_structp png_ptr, int heuristic_method,
1216 int num_weights)
1217 {
1218 if (png_ptr == NULL)
1219 return 0;
1220
1221 /* Clear out the arrays */
1222 png_reset_filter_heuristics(png_ptr);
1223
1224 /* Check arguments; the 'reset' function makes the correct settings for the
1225 * unweighted case, but we must handle the weight case by initializing the
1226 * arrays for the caller.
1227 */
1228 if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
1229 {
1230 int i;
1231
1232 if (num_weights > 0)
1233 {
1234 png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
1235 (png_uint_32)(png_sizeof(png_byte) * num_weights));
1236
1237 /* To make sure that the weighting starts out fairly */
1238 for (i = 0; i < num_weights; i++)
1239 {
1240 png_ptr->prev_filters[i] = 255;
1241 }
1242
1243 png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
1244 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1245
1246 png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
1247 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1248
1249 for (i = 0; i < num_weights; i++)
1250 {
1251 png_ptr->inv_filter_weights[i] =
1252 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1253 }
1254
1255 /* Safe to set this now */
1256 png_ptr->num_prev_filters = (png_byte)num_weights;
1257 }
1258
1259 /* If, in the future, there are other filter methods, this would
1260 * need to be based on png_ptr->filter.
1261 */
1262 if (png_ptr->filter_costs == NULL)
1263 {
1264 png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
1265 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1266
1267 png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
1268 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1269 }
1270
1271 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1272 {
1273 png_ptr->inv_filter_costs[i] =
1274 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
1275 }
1276
1277 /* All the arrays are inited, safe to set this: */
1278 png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;
1279
1280 /* Return the 'ok' code. */
1281 return 1;
1282 }
1283 else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||
1284 heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
1285 {
1286 return 1;
1287 }
1288 else
1289 {
1290 png_warning(png_ptr, "Unknown filter heuristic method");
1291 return 0;
1292 }
1293 }
1294
1295 /* Provide floating and fixed point APIs */
1296 #ifdef PNG_FLOATING_POINT_SUPPORTED
1297 void PNGAPI
1298 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
1299 int num_weights, png_const_doublep filter_weights,
1300 png_const_doublep filter_costs)
1301 {
1302 png_debug(1, "in png_set_filter_heuristics");
1303
1304 /* The internal API allocates all the arrays and ensures that the elements of
1305 * those arrays are set to the default value.
1306 */
1307 if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
1308 return;
1309
1310 /* If using the weighted method copy in the weights. */
1311 if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
1312 {
1313 int i;
1314 for (i = 0; i < num_weights; i++)
1315 {
1316 if (filter_weights[i] <= 0.0)
1317 {
1318 png_ptr->inv_filter_weights[i] =
1319 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1320 }
1321
1322 else
1323 {
1324 png_ptr->inv_filter_weights[i] =
1325 (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);
1326
1327 png_ptr->filter_weights[i] =
1328 (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);
1329 }
1330 }
1331
1332 /* Here is where we set the relative costs of the different filters. We
1333 * should take the desired compression level into account when setting
1334 * the costs, so that Paeth, for instance, has a high relative cost at low
1335 * compression levels, while it has a lower relative cost at higher
1336 * compression settings. The filter types are in order of increasing
1337 * relative cost, so it would be possible to do this with an algorithm.
1338 */
1339 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0)
1340 {
1341 png_ptr->inv_filter_costs[i] =
1342 (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);
1343
1344 png_ptr->filter_costs[i] =
1345 (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);
1346 }
1347 }
1348 }
1349 #endif /* FLOATING_POINT */
1350
1351 #ifdef PNG_FIXED_POINT_SUPPORTED
1352 void PNGAPI
1353 png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method,
1354 int num_weights, png_const_fixed_point_p filter_weights,
1355 png_const_fixed_point_p filter_costs)
1356 {
1357 png_debug(1, "in png_set_filter_heuristics_fixed");
1358
1359 /* The internal API allocates all the arrays and ensures that the elements of
1360 * those arrays are set to the default value.
1361 */
1362 if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
1363 return;
1364
1365 /* If using the weighted method copy in the weights. */
1366 if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
1367 {
1368 int i;
1369 for (i = 0; i < num_weights; i++)
1370 {
1371 if (filter_weights[i] <= 0)
1372 {
1373 png_ptr->inv_filter_weights[i] =
1374 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1375 }
1376
1377 else
1378 {
1379 png_ptr->inv_filter_weights[i] = (png_uint_16)
1380 ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
1381
1382 png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*
1383 PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);
1384 }
1385 }
1386
1387 /* Here is where we set the relative costs of the different filters. We
1388 * should take the desired compression level into account when setting
1389 * the costs, so that Paeth, for instance, has a high relative cost at low
1390 * compression levels, while it has a lower relative cost at higher
1391 * compression settings. The filter types are in order of increasing
1392 * relative cost, so it would be possible to do this with an algorithm.
1393 */
1394 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1395 if (filter_costs[i] >= PNG_FP_1)
1396 {
1397 png_uint_32 tmp;
1398
1399 /* Use a 32 bit unsigned temporary here because otherwise the
1400 * intermediate value will be a 32 bit *signed* integer (ANSI rules)
1401 * and this will get the wrong answer on division.
1402 */
1403 tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);
1404 tmp /= filter_costs[i];
1405
1406 png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;
1407
1408 tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;
1409 tmp /= PNG_FP_1;
1410
1411 png_ptr->filter_costs[i] = (png_uint_16)tmp;
1412 }
1413 }
1414 }
1415 #endif /* FIXED_POINT */
1416 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1417
1418 void PNGAPI
1419 png_set_compression_level(png_structp png_ptr, int level)
1420 {
1421 png_debug(1, "in png_set_compression_level");
1422
1423 if (png_ptr == NULL)
1424 return;
1425
1426 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
1427 png_ptr->zlib_level = level;
1428 }
1429
1430 void PNGAPI
1431 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
1432 {
1433 png_debug(1, "in png_set_compression_mem_level");
1434
1435 if (png_ptr == NULL)
1436 return;
1437
1438 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
1439 png_ptr->zlib_mem_level = mem_level;
1440 }
1441
1442 void PNGAPI
1443 png_set_compression_strategy(png_structp png_ptr, int strategy)
1444 {
1445 png_debug(1, "in png_set_compression_strategy");
1446
1447 if (png_ptr == NULL)
1448 return;
1449
1450 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
1451 png_ptr->zlib_strategy = strategy;
1452 }
1453
1454 void PNGAPI
1455 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
1456 {
1457 if (png_ptr == NULL)
1458 return;
1459
1460 if (window_bits > 15)
1461 png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1462
1463 else if (window_bits < 8)
1464 png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1465
1466 #ifndef WBITS_8_OK
1467 /* Avoid libpng bug with 256-byte windows */
1468 if (window_bits == 8)
1469 {
1470 png_warning(png_ptr, "Compression window is being reset to 512");
1471 window_bits = 9;
1472 }
1473
1474 #endif
1475 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
1476 png_ptr->zlib_window_bits = window_bits;
1477 }
1478
1479 void PNGAPI
1480 png_set_compression_method(png_structp png_ptr, int method)
1481 {
1482 png_debug(1, "in png_set_compression_method");
1483
1484 if (png_ptr == NULL)
1485 return;
1486
1487 if (method != 8)
1488 png_warning(png_ptr, "Only compression method 8 is supported by PNG");
1489
1490 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
1491 png_ptr->zlib_method = method;
1492 }
1493
1494 void PNGAPI
1495 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
1496 {
1497 if (png_ptr == NULL)
1498 return;
1499
1500 png_ptr->write_row_fn = write_row_fn;
1501 }
1502
1503 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1504 void PNGAPI
1505 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
1506 write_user_transform_fn)
1507 {
1508 png_debug(1, "in png_set_write_user_transform_fn");
1509
1510 if (png_ptr == NULL)
1511 return;
1512
1513 png_ptr->transformations |= PNG_USER_TRANSFORM;
1514 png_ptr->write_user_transform_fn = write_user_transform_fn;
1515 }
1516 #endif
1517
1518
1519 #ifdef PNG_INFO_IMAGE_SUPPORTED
1520 void PNGAPI
1521 png_write_png(png_structp png_ptr, png_infop info_ptr,
1522 int transforms, voidp params)
1523 {
1524 if (png_ptr == NULL || info_ptr == NULL)
1525 return;
1526
1527 /* Write the file header information. */
1528 png_write_info(png_ptr, info_ptr);
1529
1530 /* ------ these transformations don't touch the info structure ------- */
1531
1532 #ifdef PNG_WRITE_INVERT_SUPPORTED
1533 /* Invert monochrome pixels */
1534 if (transforms & PNG_TRANSFORM_INVERT_MONO)
1535 png_set_invert_mono(png_ptr);
1536 #endif
1537
1538 #ifdef PNG_WRITE_SHIFT_SUPPORTED
1539 /* Shift the pixels up to a legal bit depth and fill in
1540 * as appropriate to correctly scale the image.
1541 */
1542 if ((transforms & PNG_TRANSFORM_SHIFT)
1543 && (info_ptr->valid & PNG_INFO_sBIT))
1544 png_set_shift(png_ptr, &info_ptr->sig_bit);
1545 #endif
1546
1547 #ifdef PNG_WRITE_PACK_SUPPORTED
1548 /* Pack pixels into bytes */
1549 if (transforms & PNG_TRANSFORM_PACKING)
1550 png_set_packing(png_ptr);
1551 #endif
1552
1553 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1554 /* Swap location of alpha bytes from ARGB to RGBA */
1555 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1556 png_set_swap_alpha(png_ptr);
1557 #endif
1558
1559 #ifdef PNG_WRITE_FILLER_SUPPORTED
1560 /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
1561 if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
1562 png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
1563
1564 else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
1565 png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
1566 #endif
1567
1568 #ifdef PNG_WRITE_BGR_SUPPORTED
1569 /* Flip BGR pixels to RGB */
1570 if (transforms & PNG_TRANSFORM_BGR)
1571 png_set_bgr(png_ptr);
1572 #endif
1573
1574 #ifdef PNG_WRITE_SWAP_SUPPORTED
1575 /* Swap bytes of 16-bit files to most significant byte first */
1576 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1577 png_set_swap(png_ptr);
1578 #endif
1579
1580 #ifdef PNG_WRITE_PACKSWAP_SUPPORTED
1581 /* Swap bits of 1, 2, 4 bit packed pixel formats */
1582 if (transforms & PNG_TRANSFORM_PACKSWAP)
1583 png_set_packswap(png_ptr);
1584 #endif
1585
1586 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1587 /* Invert the alpha channel from opacity to transparency */
1588 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1589 png_set_invert_alpha(png_ptr);
1590 #endif
1591
1592 /* ----------------------- end of transformations ------------------- */
1593
1594 /* Write the bits */
1595 if (info_ptr->valid & PNG_INFO_IDAT)
1596 png_write_image(png_ptr, info_ptr->row_pointers);
1597
1598 /* It is REQUIRED to call this to finish writing the rest of the file */
1599 png_write_end(png_ptr, info_ptr);
1600
1601 PNG_UNUSED(transforms) /* Quiet compiler warnings */
1602 PNG_UNUSED(params)
1603 }
1604 #endif
1605 #endif /* PNG_WRITE_SUPPORTED */
png_do_write_intrapixel
void png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
Definition: pngwtran.c:570
PNG_FILTER_VALUE_AVG
#define PNG_FILTER_VALUE_AVG
Definition: png.h:1320
png_set_packing
void PNGAPI png_set_packing(png_structp png_ptr)
Definition: pngtrans.c:50
PNG_TRANSFORM_SWAP_ENDIAN
#define PNG_TRANSFORM_SWAP_ENDIAN
Definition: png.h:863
png_write_start_row
void png_write_start_row(png_structp png_ptr)
Definition: pngwutil.c:1774
PNG_BGR
#define PNG_BGR
Definition: pngpriv.h:280
png_memcpy
#define png_memcpy
Definition: pngpriv.h:226
PNG_INVERT_ALPHA
#define PNG_INVERT_ALPHA
Definition: pngpriv.h:299
png_free_data
void PNGAPI png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
Definition: png.c:247
png_write_image
void PNGAPI png_write_image(png_structp png_ptr, png_bytepp image)
Definition: pngwrite.c:614
png_write_png
void PNGAPI png_write_png(png_structp png_ptr, png_infop info_ptr, int transforms, voidp params)
Definition: pngwrite.c:1521
PNG_INFO_gAMA
#define PNG_INFO_gAMA
Definition: png.h:753
PNG_FILTER_VALUE_LAST
#define PNG_FILTER_VALUE_LAST
Definition: png.h:1322
png_write_sPLT
void png_write_sPLT(png_structp png_ptr, png_const_sPLT_tp spalette)
Definition: pngwutil.c:931
PNG_FILLER_BEFORE
#define PNG_FILLER_BEFORE
Definition: png.h:1107
png_set_flush
void PNGAPI png_set_flush(png_structp png_ptr, int nrows)
Definition: pngwrite.c:840
PNG_INFO_tIME
#define PNG_INFO_tIME
Definition: png.h:762
png_write_PLTE
void png_write_PLTE(png_structp png_ptr, png_const_colorp palette, png_uint_32 num_pal)
Definition: pngwutil.c:671
PNG_FILTER_PAETH
#define PNG_FILTER_PAETH
Definition: png.h:1310
PNG_INVERT_MONO
#define PNG_INVERT_MONO
Definition: pngpriv.h:285
PNG_INFO_sRGB
#define PNG_INFO_sRGB
Definition: png.h:764
PNG_NO_FILTERS
#define PNG_NO_FILTERS
Definition: png.h:1305
PNG_UNUSED
#define PNG_UNUSED(param)
Definition: pngpriv.h:92
png_set_compression_level
void PNGAPI png_set_compression_level(png_structp png_ptr, int level)
Definition: pngwrite.c:1419
PNG_FILTER_HEURISTIC_WEIGHTED
#define PNG_FILTER_HEURISTIC_WEIGHTED
Definition: png.h:1367
png_write_sBIT
void png_write_sBIT(png_structp png_ptr, png_const_color_8p sbit, int color_type)
Definition: pngwutil.c:1016
PNG_FILTER_SUB
#define PNG_FILTER_SUB
Definition: png.h:1307
PNG_INFO_hIST
#define PNG_INFO_hIST
Definition: png.h:759
PNG_TRANSFORM_INVERT_MONO
#define PNG_TRANSFORM_INVERT_MONO
Definition: png.h:859
png_set_mem_fn
void PNGAPI png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Definition: pngmem.c:634
png_set_filter_heuristics
void PNGAPI png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs)
Definition: pngwrite.c:1298
png_set_invert_alpha
void PNGAPI png_set_invert_alpha(png_structp png_ptr)
Definition: pngtrans.c:185
PNG_TRANSFORM_PACKSWAP
#define PNG_TRANSFORM_PACKSWAP
Definition: png.h:857
png_write_gAMA_fixed
void png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
Definition: pngwutil.c:813
png_write_rows
void PNGAPI png_write_rows(png_structp png_ptr, png_bytepp row, png_uint_32 num_rows)
Definition: pngwrite.c:592
png_charp
char FAR * png_charp
Definition: pngconf.h:572
PNG_COLOR_TYPE_PALETTE
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:690
PNG_FILTER_VALUE_PAETH
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:1321
PNG_ABORT
#define PNG_ABORT()
Definition: pngpriv.h:191
png_write_zTXt
void png_write_zTXt(png_structp png_ptr, png_const_charp key, png_const_charp text, png_size_t text_len, int compression)
Definition: pngwutil.c:1450
png_debug
#define png_debug(l, m)
Definition: pngdebug.h:149
PNG_TRANSFORM_BGR
#define PNG_TRANSFORM_BGR
Definition: png.h:861
png_struct_def
Definition: pngstruct.h:29
png_memset
#define png_memset
Definition: pngpriv.h:227
png_do_write_transformations
void png_do_write_transformations(png_structp png_ptr)
Definition: pngwtran.c:22
png_const_charp
PNG_CONST char FAR * png_const_charp
Definition: pngconf.h:573
png_set_compression_strategy
void PNGAPI png_set_compression_strategy(png_structp png_ptr, int strategy)
Definition: pngwrite.c:1443
PNG_FP_HALF
#define PNG_FP_HALF
Definition: png.h:680
deflateEnd
int ZEXPORT deflateEnd(z_streamp strm)
Definition: deflate.c:895
png_write_oFFs
void png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, int unit_type)
Definition: pngwutil.c:1606
png_write_IDAT
void png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
Definition: pngwutil.c:742
PNG_STRUCT_PNG
#define PNG_STRUCT_PNG
Definition: pngpriv.h:314
PNG_TRANSFORM_STRIP_FILLER_AFTER
#define PNG_TRANSFORM_STRIP_FILLER_AFTER
Definition: png.h:868
png_set_write_fn
void PNGAPI png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
Definition: pngwio.c:180
PNG_TEXT_COMPRESSION_NONE_WR
#define PNG_TEXT_COMPRESSION_NONE_WR
Definition: png.h:617
PNG_INFO_oFFs
#define PNG_INFO_oFFs
Definition: png.h:761
png_jmpbuf
#define png_jmpbuf(png_ptr)
Definition: png.h:970
PNG_ALLOCATED
#define PNG_ALLOCATED
Definition: pngconf.h:428
PNG_COST_FACTOR
#define PNG_COST_FACTOR
Definition: pngpriv.h:319
png_structpp
png_struct FAR *FAR * png_structpp
Definition: png.h:887
PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL
Definition: pngpriv.h:324
png_write_pCAL
void png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params)
Definition: pngwutil.c:1627
png_flush
void png_flush(png_structp png_ptr)
Definition: pngwio.c:129
png_write_row
void PNGAPI png_write_row(png_structp png_ptr, png_const_bytep row)
Definition: pngwrite.c:646
png_write_pHYs
void png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int unit_type)
Definition: pngwutil.c:1721
PNG_HAVE_IDAT
#define PNG_HAVE_IDAT
Definition: pngpriv.h:266
png_set_bgr
void PNGAPI png_set_bgr(png_structp png_ptr)
Definition: pngtrans.c:21
PNG_FILLER
#define PNG_FILLER
Definition: pngpriv.h:295
png_bytepp
png_byte FAR *FAR * png_bytepp
Definition: pngconf.h:589
png_unknown_chunk_t::name
png_byte name[5]
Definition: png.h:653
PNG_TEXT_COMPRESSION_zTXt
#define PNG_TEXT_COMPRESSION_zTXt
Definition: png.h:620
png_set_write_user_transform_fn
void PNGAPI png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr write_user_transform_fn)
Definition: pngwrite.c:1505
png_unknown_chunk_t
Definition: png.h:651
PNG_FILTER_HEURISTIC_UNWEIGHTED
#define PNG_FILTER_HEURISTIC_UNWEIGHTED
Definition: png.h:1366
png_uint_32
unsigned long png_uint_32
Definition: pngconf.h:480
PNG_TEXT_COMPRESSION_NONE
#define PNG_TEXT_COMPRESSION_NONE
Definition: png.h:619
PNGAPI
#define PNGAPI
Definition: pngconf.h:256
png_structp
png_struct FAR * png_structp
Definition: png.h:797
png_write_info
void PNGAPI png_write_info(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:120
PNG_HANDLE_CHUNK_ALWAYS
#define PNG_HANDLE_CHUNK_ALWAYS
Definition: png.h:2032
png_write_tIME
void png_write_tIME(png_structp png_ptr, png_const_timep mod_time)
Definition: pngwutil.c:1746
png_set_filler
void PNGAPI png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
Definition: pngtrans.c:118
png_write_cHRM_fixed
void png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, png_fixed_point blue_y)
Definition: pngwutil.c:1076
png_write_tEXt
void png_write_tEXt(png_structp png_ptr, png_const_charp key, png_const_charp text, png_size_t text_len)
Definition: pngwutil.c:1408
PNG_FREE_ALL
#define PNG_FREE_ALL
Definition: png.h:1574
png_timep
png_time FAR * png_timep
Definition: png.h:640
png_set_packswap
void PNGAPI png_set_packswap(png_structp png_ptr)
Definition: pngtrans.c:68
PNG_CONST
#define PNG_CONST
Definition: pngconf.h:462
PNG_USER_HEIGHT_MAX
#define PNG_USER_HEIGHT_MAX
Definition: pnglibconf.h:17
png_infop
png_info FAR * png_infop
Definition: png.h:667
PNG_TRANSFORM_STRIP_FILLER_BEFORE
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE
Definition: png.h:867
png_destroy_struct
void png_destroy_struct(png_voidp struct_ptr)
Definition: pngmem.c:429
png_set_swap
void PNGAPI png_set_swap(png_structp png_ptr)
Definition: pngtrans.c:35
png_write_flush
void PNGAPI png_write_flush(png_structp png_ptr)
Definition: pngwrite.c:852
png_write_find_filter
void png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
Definition: pngwutil.c:2189
png_byte
unsigned char png_byte
Definition: pngconf.h:485
png_uint_16
unsigned short png_uint_16
Definition: pngconf.h:483
png_set_compression_mem_level
void PNGAPI png_set_compression_mem_level(png_structp png_ptr, int mem_level)
Definition: pngwrite.c:1431
PNG_FILTER_VALUE_SUB
#define PNG_FILTER_VALUE_SUB
Definition: png.h:1318
png_write_IHDR
void png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int compression_type, int filter_type, int interlace_type)
Definition: pngwutil.c:449
png_warning
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:108
PNG_WEIGHT_FACTOR
#define PNG_WEIGHT_FACTOR
Definition: pngpriv.h:318
PNG_ALL_FILTERS
#define PNG_ALL_FILTERS
Definition: png.h:1311
png_handle_as_unknown
int PNGAPI png_handle_as_unknown(png_structp png_ptr, png_const_bytep chunk_name)
Definition: png.c:614
png_set_write_status_fn
void PNGAPI png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
Definition: pngwrite.c:1495
PNG_SWAP_BYTES
#define PNG_SWAP_BYTES
Definition: pngpriv.h:284
FAR
#define FAR
Definition: jmorecfg.h:215
PNG_PACKSWAP
#define PNG_PACKSWAP
Definition: pngpriv.h:296
png_uint_16p
png_uint_16 FAR * png_uint_16p
Definition: pngconf.h:568
num_rows
int JSAMPARRAY int int num_rows
Definition: jpegint.h:373
png_write_end
void PNGAPI png_write_end(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:294
png_const_bytep
PNG_CONST png_byte FAR * png_const_bytep
Definition: pngconf.h:563
png_const_fixed_point_p
PNG_CONST png_fixed_point FAR * png_const_fixed_point_p
Definition: pngconf.h:575
png_set_shift
void PNGAPI png_set_shift(png_structp png_ptr, png_const_color_8p true_bits)
Definition: pngtrans.c:82
png_debug1
#define png_debug1(l, m, p1)
Definition: pngdebug.h:152
PNG_FILTER_UP
#define PNG_FILTER_UP
Definition: png.h:1308
PNG_FILTER_AVG
#define PNG_FILTER_AVG
Definition: png.h:1309
PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS
Definition: pngpriv.h:325
PNG_INFO_sBIT
#define PNG_INFO_sBIT
Definition: png.h:754
PNG_TRANSFORM_PACKING
#define PNG_TRANSFORM_PACKING
Definition: png.h:856
PNG_TRANSFORM_INVERT_ALPHA
#define PNG_TRANSFORM_INVERT_ALPHA
Definition: png.h:864
png_write_iCCP
void png_write_iCCP(png_structp png_ptr, png_const_charp name, int compression_type, png_const_charp profile, int profile_len)
Definition: pngwutil.c:848
png_set_compression_window_bits
void PNGAPI png_set_compression_window_bits(png_structp png_ptr, int window_bits)
Definition: pngwrite.c:1455
png_unknown_chunk_t::location
png_byte location
Definition: png.h:658
voidp
Byte * voidp
Definition: zconf.h:356
PNG_FILTER_VALUE_UP
#define PNG_FILTER_VALUE_UP
Definition: png.h:1319
deflate
int ZEXPORT deflate(z_streamp strm, int flush)
Definition: deflate.c:582
PNG_FLAG_ZLIB_CUSTOM_METHOD
#define PNG_FLAG_ZLIB_CUSTOM_METHOD
Definition: pngpriv.h:326
png_set_invert_mono
void PNGAPI png_set_invert_mono(png_structp png_ptr)
Definition: pngtrans.c:198
PNG_FLAG_MNG_FILTER_64
#define PNG_FLAG_MNG_FILTER_64
Definition: png.h:874
PNG_INFO_PLTE
#define PNG_INFO_PLTE
Definition: png.h:756
PNG_INTERLACE
#define PNG_INTERLACE
Definition: pngpriv.h:281
png_bytep
png_byte FAR * png_bytep
Definition: pngconf.h:562
PNG_FLAG_ZLIB_CUSTOM_LEVEL
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL
Definition: pngpriv.h:323
PNG_WROTE_tIME
#define PNG_WROTE_tIME
Definition: pngpriv.h:273
PNG_FP_1
#define PNG_FP_1
Definition: png.h:679
keep
int keep(0)
pngpriv.h
PNG_FILTER_TYPE_BASE
#define PNG_FILTER_TYPE_BASE
Definition: png.h:703
png_write_destroy
void png_write_destroy(png_structp png_ptr)
Definition: pngwrite.c:980
png_set_filter_heuristics_fixed
void PNGAPI png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method, int num_weights, png_const_fixed_point_p filter_weights, png_const_fixed_point_p filter_costs)
Definition: pngwrite.c:1353
PNG_TEXT_COMPRESSION_zTXt_WR
#define PNG_TEXT_COMPRESSION_zTXt_WR
Definition: png.h:618
PNG_INFO_IDAT
#define PNG_INFO_IDAT
Definition: png.h:768
PNG_COMPRESSION_TYPE_BASE
#define PNG_COMPRESSION_TYPE_BASE
Definition: png.h:699
png_write_sRGB
void png_write_sRGB(png_structp png_ptr, int srgb_intent)
Definition: pngwutil.c:829
PNG_AFTER_IDAT
#define PNG_AFTER_IDAT
Definition: pngpriv.h:267
png_write_info_before_PLTE
void PNGAPI png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:28
PNG_INFO_tRNS
#define PNG_INFO_tRNS
Definition: png.h:757
PNG_FILTER_HEURISTIC_DEFAULT
#define PNG_FILTER_HEURISTIC_DEFAULT
Definition: png.h:1365
png_convert_from_time_t
void PNGAPI png_convert_from_time_t(png_timep ptime, time_t ttime)
Definition: pngwrite.c:428
png_write_sig
void PNGAPI png_write_sig(png_structp png_ptr)
Definition: pngwutil.c:68
png_destroy_write_struct
void PNGAPI png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
Definition: pngwrite.c:909
png_set_interlace_handling
int PNGAPI png_set_interlace_handling(png_structp png_ptr)
Definition: pngtrans.c:97
PNG_WROTE_INFO_BEFORE_PLTE
#define PNG_WROTE_INFO_BEFORE_PLTE
Definition: pngpriv.h:274
PNG_SHIFT
#define PNG_SHIFT
Definition: pngpriv.h:283
png_write_tRNS
void png_write_tRNS(png_structp png_ptr, png_const_bytep trans_alpha, png_const_color_16p tran, int num_trans, int color_type)
Definition: pngwutil.c:1112
png_voidp
void FAR * png_voidp
Definition: pngconf.h:560
png_write_IEND
void png_write_IEND(png_structp png_ptr)
Definition: pngwutil.c:800
PNG_HAVE_PLTE
#define PNG_HAVE_PLTE
Definition: pngpriv.h:265
png_write_iTXt
void png_write_iTXt(png_structp png_ptr, int compression, png_const_charp key, png_const_charp lang, png_const_charp lang_key, png_const_charp text)
Definition: pngwutil.c:1512
PNG_TRANSFORM_SWAP_ALPHA
#define PNG_TRANSFORM_SWAP_ALPHA
Definition: png.h:862
png_destroy_struct_2
void png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, png_voidp mem_ptr)
Definition: pngmem.c:437
Z_OK
#define Z_OK
Definition: zlib.h:173
PNG_FILLER_AFTER
#define PNG_FILLER_AFTER
Definition: png.h:1108
PNG_FILTER_VALUE_NONE
#define PNG_FILTER_VALUE_NONE
Definition: png.h:1317
PNG_ZBUF_SIZE
#define PNG_ZBUF_SIZE
Definition: pnglibconf.h:25
Z_SYNC_FLUSH
#define Z_SYNC_FLUSH
Definition: zlib.h:166
PNG_USER_TRANSFORM
#define PNG_USER_TRANSFORM
Definition: pngpriv.h:300
PNG_WRITE_INTERLACING_SUPPORTED
#define PNG_WRITE_INTERLACING_SUPPORTED
Definition: pnglibconf.h:45
PNG_INTRAPIXEL_DIFFERENCING
#define PNG_INTRAPIXEL_DIFFERENCING
Definition: png.h:704
png_write_hIST
void png_write_hIST(png_structp png_ptr, png_const_uint_16p hist, int num_hist)
Definition: pngwutil.c:1240
PNG_USER_WIDTH_MAX
#define PNG_USER_WIDTH_MAX
Definition: pnglibconf.h:28
png_write_chunk
void PNGAPI png_write_chunk(png_structp png_ptr, png_const_bytep chunk_name, png_const_bytep data, png_size_t length)
Definition: pngwutil.c:95
png_set_compression_method
void PNGAPI png_set_compression_method(png_structp png_ptr, int method)
Definition: pngwrite.c:1480
PNG_INFO_sPLT
#define PNG_INFO_sPLT
Definition: png.h:766
PNG_FUNCTION
PNG_FUNCTION(png_structp, PNGAPI png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn), PNG_ALLOCATED)
Definition: pngwrite.c:440
PNG_FLAG_LIBRARY_MISMATCH
#define PNG_FLAG_LIBRARY_MISMATCH
Definition: pngpriv.h:339
png_snprintf2
#define png_snprintf2
Definition: pngpriv.h:240
png_write_finish_row
void png_write_finish_row(png_structp png_ptr)
Definition: pngwutil.c:1880
PNG_FLAG_KEEP_UNSAFE_CHUNKS
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS
Definition: pngpriv.h:338
PNG_FILTER_NONE
#define PNG_FILTER_NONE
Definition: png.h:1306
png_unknown_chunk_t::data
png_byte * data
Definition: png.h:654
png_libpng_ver
#define png_libpng_ver
Definition: png.h:461
png_infopp
png_info FAR *FAR * png_infopp
Definition: png.h:669
png_free
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
Definition: pngmem.c:569
PNG_INFO_pHYs
#define PNG_INFO_pHYs
Definition: png.h:760
png_set_swap_alpha
void PNGAPI png_set_swap_alpha(png_structp png_ptr)
Definition: pngtrans.c:171
PNG_INFO_pCAL
#define PNG_INFO_pCAL
Definition: png.h:763
PNG_ROWBYTES
#define PNG_ROWBYTES(pixel_bits, width)
Definition: pngpriv.h:382
PNG_HAVE_PNG_SIGNATURE
#define PNG_HAVE_PNG_SIGNATURE
Definition: pngpriv.h:276
PNG_TRANSFORM_SHIFT
#define PNG_TRANSFORM_SHIFT
Definition: png.h:860
PNG_INFO_cHRM
#define PNG_INFO_cHRM
Definition: png.h:755
png_set_filter
void PNGAPI png_set_filter(png_structp png_ptr, int method, int filters)
Definition: pngwrite.c:1047
png_write_sCAL_s
void png_write_sCAL_s(png_structp png_ptr, int unit, png_const_charp width, png_const_charp height)
Definition: pngwutil.c:1690
PNG_INFO_bKGD
#define PNG_INFO_bKGD
Definition: png.h:758
png_do_write_interlace
void png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
Definition: pngwutil.c:2008
png_set_error_fn
void PNGAPI png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)
Definition: pngerror.c:409
PNG_HANDLE_CHUNK_NEVER
#define PNG_HANDLE_CHUNK_NEVER
Definition: png.h:2030
level
int level(0)
PNG_PACK
#define PNG_PACK
Definition: pngpriv.h:282
PNG_INFO_iCCP
#define PNG_INFO_iCCP
Definition: png.h:765
uInt
unsigned int uInt
Definition: zconf.h:335
png_convert_from_struct_tm
void PNGAPI png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR *ttime)
Definition: pngwrite.c:415
png_sizeof
#define png_sizeof(x)
Definition: pngconf.h:492
PNG_INFO_sCAL
#define PNG_INFO_sCAL
Definition: png.h:767
png_debug2
#define png_debug2(l, m, p1, p2)
Definition: pngdebug.h:155
png_write_bKGD
void png_write_bKGD(png_structp png_ptr, png_const_color_16p back, int color_type)
Definition: pngwutil.c:1177
png_unknown_chunk_t::size
png_size_t size
Definition: png.h:655
PNG_FLAG_ZLIB_CUSTOM_STRATEGY
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY
Definition: pngpriv.h:322