Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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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 1.2.54 [November 12, 2015]
5  * Copyright (c) 1998-2002,2004,2006-2015 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 /* Get internal access to png.h */
15 #define PNG_INTERNAL
16 #define PNG_NO_PEDANTIC_WARNINGS
17 #include "png.h"
18 #ifdef PNG_WRITE_SUPPORTED
19 
20 /* Writes all the PNG information. This is the suggested way to use the
21  * library. If you have a new chunk to add, make a function to write it,
22  * and put it in the correct location here. If you want the chunk written
23  * after the image data, put it in png_write_end(). I strongly encourage
24  * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
25  * the chunk, as that will keep the code from breaking if you want to just
26  * write a plain PNG file. If you have long comments, I suggest writing
27  * them in png_write_end(), and compressing them.
28  */
29 void PNGAPI
31 {
32  png_debug(1, "in png_write_info_before_PLTE");
33 
34  if (png_ptr == NULL || info_ptr == NULL)
35  return;
36  if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
37  {
38  /* Write PNG signature */
39  png_write_sig(png_ptr);
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  /* Write IHDR information. */
49  png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
50  info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
51  info_ptr->filter_type,
53  info_ptr->interlace_type);
54 #else
55  0);
56 #endif
57  /* The rest of these check to see if the valid field has the appropriate
58  * flag set, and if it does, writes the chunk.
59  */
60 #ifdef PNG_WRITE_gAMA_SUPPORTED
61  if (info_ptr->valid & PNG_INFO_gAMA)
62  {
63 # ifdef PNG_FLOATING_POINT_SUPPORTED
64  png_write_gAMA(png_ptr, info_ptr->gamma);
65 #else
66 #ifdef PNG_FIXED_POINT_SUPPORTED
67  png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
68 # endif
69 #endif
70  }
71 #endif
72 #ifdef PNG_WRITE_sRGB_SUPPORTED
73  if (info_ptr->valid & PNG_INFO_sRGB)
74  png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
75 #endif
76 #ifdef PNG_WRITE_iCCP_SUPPORTED
77  if (info_ptr->valid & PNG_INFO_iCCP)
78  png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
79  info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
80 #endif
81 #ifdef PNG_WRITE_sBIT_SUPPORTED
82  if (info_ptr->valid & PNG_INFO_sBIT)
83  png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
84 #endif
85 #ifdef PNG_WRITE_cHRM_SUPPORTED
86  if (info_ptr->valid & PNG_INFO_cHRM)
87  {
88 #ifdef PNG_FLOATING_POINT_SUPPORTED
89  png_write_cHRM(png_ptr,
90  info_ptr->x_white, info_ptr->y_white,
91  info_ptr->x_red, info_ptr->y_red,
92  info_ptr->x_green, info_ptr->y_green,
93  info_ptr->x_blue, info_ptr->y_blue);
94 #else
95 # ifdef PNG_FIXED_POINT_SUPPORTED
96  png_write_cHRM_fixed(png_ptr,
97  info_ptr->int_x_white, info_ptr->int_y_white,
98  info_ptr->int_x_red, info_ptr->int_y_red,
99  info_ptr->int_x_green, info_ptr->int_y_green,
100  info_ptr->int_x_blue, info_ptr->int_y_blue);
101 # endif
102 #endif
103  }
104 #endif
105 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
106  if (info_ptr->unknown_chunks_num)
107  {
108  png_unknown_chunk *up;
109 
110  png_debug(5, "writing extra chunks");
111 
112  for (up = info_ptr->unknown_chunks;
113  up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
114  up++)
115  {
116  int keep = png_handle_as_unknown(png_ptr, up->name);
117  if (keep != PNG_HANDLE_CHUNK_NEVER &&
118  up->location && !(up->location & PNG_HAVE_PLTE) &&
119  !(up->location & PNG_HAVE_IDAT) &&
120  ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
121  (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
122  {
123  if (up->size == 0)
124  png_warning(png_ptr, "Writing zero-length unknown chunk");
125  png_write_chunk(png_ptr, up->name, up->data, up->size);
126  }
127  }
128  }
129 #endif
130  png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
131  }
132 }
133 
134 void PNGAPI
136 {
137 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
138  int i;
139 #endif
140 
141  png_debug(1, "in png_write_info");
142 
143  if (png_ptr == NULL || info_ptr == NULL)
144  return;
145 
146  png_write_info_before_PLTE(png_ptr, info_ptr);
147 
148  if (info_ptr->valid & PNG_INFO_PLTE)
149  png_write_PLTE(png_ptr, info_ptr->palette,
150  (png_uint_32)info_ptr->num_palette);
151  else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
152  png_error(png_ptr, "Valid palette required for paletted images");
153 
154 #ifdef PNG_WRITE_tRNS_SUPPORTED
155  if (info_ptr->valid & PNG_INFO_tRNS)
156  {
157 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
158  /* Invert the alpha channel (in tRNS) */
159  if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
160  info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
161  {
162  int j;
163  for (j = 0; j<(int)info_ptr->num_trans; j++)
164  info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
165  }
166 #endif
167  png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
168  info_ptr->num_trans, info_ptr->color_type);
169  }
170 #endif
171 #ifdef PNG_WRITE_bKGD_SUPPORTED
172  if (info_ptr->valid & PNG_INFO_bKGD)
173  png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
174 #endif
175 #ifdef PNG_WRITE_hIST_SUPPORTED
176  if (info_ptr->valid & PNG_INFO_hIST)
177  png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
178 #endif
179 #ifdef PNG_WRITE_oFFs_SUPPORTED
180  if (info_ptr->valid & PNG_INFO_oFFs)
181  png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
182  info_ptr->offset_unit_type);
183 #endif
184 #ifdef PNG_WRITE_pCAL_SUPPORTED
185  if (info_ptr->valid & PNG_INFO_pCAL)
186  png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
187  info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
188  info_ptr->pcal_units, info_ptr->pcal_params);
189 #endif
190 
191 #ifdef PNG_sCAL_SUPPORTED
192  if (info_ptr->valid & PNG_INFO_sCAL)
193 #ifdef PNG_WRITE_sCAL_SUPPORTED
194 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
195  png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
196  info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
197 #else /* !FLOATING_POINT */
198 #ifdef PNG_FIXED_POINT_SUPPORTED
199  png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
200  info_ptr->scal_s_width, info_ptr->scal_s_height);
201 #endif /* FIXED_POINT */
202 #endif /* FLOATING_POINT */
203 #else /* !WRITE_sCAL */
204  png_warning(png_ptr,
205  "png_write_sCAL not supported; sCAL chunk not written.");
206 #endif /* WRITE_sCAL */
207 #endif /* sCAL */
208 
209 #ifdef PNG_WRITE_pHYs_SUPPORTED
210  if (info_ptr->valid & PNG_INFO_pHYs)
211  png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
212  info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
213 #endif /* pHYs */
214 
215 #ifdef PNG_WRITE_tIME_SUPPORTED
216  if (info_ptr->valid & PNG_INFO_tIME)
217  {
218  png_write_tIME(png_ptr, &(info_ptr->mod_time));
219  png_ptr->mode |= PNG_WROTE_tIME;
220  }
221 #endif /* tIME */
222 
223 #ifdef PNG_WRITE_sPLT_SUPPORTED
224  if (info_ptr->valid & PNG_INFO_sPLT)
225  for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
226  png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
227 #endif /* sPLT */
228 
229 #ifdef PNG_WRITE_TEXT_SUPPORTED
230  /* Check to see if we need to write text chunks */
231  for (i = 0; i < info_ptr->num_text; i++)
232  {
233  png_debug2(2, "Writing header text chunk %d, type %d", i,
234  info_ptr->text[i].compression);
235  /* An internationalized chunk? */
236  if (info_ptr->text[i].compression > 0)
237  {
238 #ifdef PNG_WRITE_iTXt_SUPPORTED
239  /* Write international chunk */
240  png_write_iTXt(png_ptr,
241  info_ptr->text[i].compression,
242  info_ptr->text[i].key,
243  info_ptr->text[i].lang,
244  info_ptr->text[i].lang_key,
245  info_ptr->text[i].text);
246 #else
247  png_warning(png_ptr, "Unable to write international text");
248 #endif
249  /* Mark this chunk as written */
250  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
251  }
252  /* If we want a compressed text chunk */
253  else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
254  {
255 #ifdef PNG_WRITE_zTXt_SUPPORTED
256  /* Write compressed chunk */
257  png_write_zTXt(png_ptr, info_ptr->text[i].key,
258  info_ptr->text[i].text, 0,
259  info_ptr->text[i].compression);
260 #else
261  png_warning(png_ptr, "Unable to write compressed text");
262 #endif
263  /* Mark this chunk as written */
264  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
265  }
266  else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
267  {
268 #ifdef PNG_WRITE_tEXt_SUPPORTED
269  /* Write uncompressed chunk */
270  png_write_tEXt(png_ptr, info_ptr->text[i].key,
271  info_ptr->text[i].text,
272  0);
273  /* Mark this chunk as written */
274  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
275 #else
276  /* Can't get here */
277  png_warning(png_ptr, "Unable to write uncompressed text");
278 #endif
279  }
280  }
281 #endif /* tEXt */
282 
283 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
284  if (info_ptr->unknown_chunks_num)
285  {
286  png_unknown_chunk *up;
287 
288  png_debug(5, "writing extra chunks");
289 
290  for (up = info_ptr->unknown_chunks;
291  up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
292  up++)
293  {
294  int keep = png_handle_as_unknown(png_ptr, up->name);
295  if (keep != PNG_HANDLE_CHUNK_NEVER &&
296  up->location && (up->location & PNG_HAVE_PLTE) &&
297  !(up->location & PNG_HAVE_IDAT) &&
298  !(up->location & PNG_AFTER_IDAT) &&
299  ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
300  (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
301  {
302  png_write_chunk(png_ptr, up->name, up->data, up->size);
303  }
304  }
305  }
306 #endif
307 }
308 
309 /* Writes the end of the PNG file. If you don't want to write comments or
310  * time information, you can pass NULL for info. If you already wrote these
311  * in png_write_info(), do not write them again here. If you have long
312  * comments, I suggest writing them here, and compressing them.
313  */
314 void PNGAPI
316 {
317  png_debug(1, "in png_write_end");
318 
319  if (png_ptr == NULL)
320  return;
321  if (!(png_ptr->mode & PNG_HAVE_IDAT))
322  png_error(png_ptr, "No IDATs written into file");
323 
324  /* See if user wants us to write information chunks */
325  if (info_ptr != NULL)
326  {
327 #ifdef PNG_WRITE_TEXT_SUPPORTED
328  int i; /* local index variable */
329 #endif
330 #ifdef PNG_WRITE_tIME_SUPPORTED
331  /* Check to see if user has supplied a time chunk */
332  if ((info_ptr->valid & PNG_INFO_tIME) &&
333  !(png_ptr->mode & PNG_WROTE_tIME))
334  png_write_tIME(png_ptr, &(info_ptr->mod_time));
335 #endif
336 #ifdef PNG_WRITE_TEXT_SUPPORTED
337  /* Loop through comment chunks */
338  for (i = 0; i < info_ptr->num_text; i++)
339  {
340  png_debug2(2, "Writing trailer text chunk %d, type %d", i,
341  info_ptr->text[i].compression);
342  /* An internationalized chunk? */
343  if (info_ptr->text[i].compression > 0)
344  {
345 #ifdef PNG_WRITE_iTXt_SUPPORTED
346  /* Write international chunk */
347  png_write_iTXt(png_ptr,
348  info_ptr->text[i].compression,
349  info_ptr->text[i].key,
350  info_ptr->text[i].lang,
351  info_ptr->text[i].lang_key,
352  info_ptr->text[i].text);
353 #else
354  png_warning(png_ptr, "Unable to write international text");
355 #endif
356  /* Mark this chunk as written */
357  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
358  }
359  else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
360  {
361 #ifdef PNG_WRITE_zTXt_SUPPORTED
362  /* Write compressed chunk */
363  png_write_zTXt(png_ptr, info_ptr->text[i].key,
364  info_ptr->text[i].text, 0,
365  info_ptr->text[i].compression);
366 #else
367  png_warning(png_ptr, "Unable to write compressed text");
368 #endif
369  /* Mark this chunk as written */
370  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
371  }
372  else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
373  {
374 #ifdef PNG_WRITE_tEXt_SUPPORTED
375  /* Write uncompressed chunk */
376  png_write_tEXt(png_ptr, info_ptr->text[i].key,
377  info_ptr->text[i].text, 0);
378 #else
379  png_warning(png_ptr, "Unable to write uncompressed text");
380 #endif
381 
382  /* Mark this chunk as written */
383  info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
384  }
385  }
386 #endif
387 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
388  if (info_ptr->unknown_chunks_num)
389  {
390  png_unknown_chunk *up;
391 
392  png_debug(5, "writing extra chunks");
393 
394  for (up = info_ptr->unknown_chunks;
395  up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
396  up++)
397  {
398  int keep = png_handle_as_unknown(png_ptr, up->name);
399  if (keep != PNG_HANDLE_CHUNK_NEVER &&
400  up->location && (up->location & PNG_AFTER_IDAT) &&
401  ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
402  (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
403  {
404  png_write_chunk(png_ptr, up->name, up->data, up->size);
405  }
406  }
407  }
408 #endif
409  }
410 
411  png_ptr->mode |= PNG_AFTER_IDAT;
412 
413  /* Write end of PNG file */
414  png_write_IEND(png_ptr);
415  /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
416  * and restored again in libpng-1.2.30, may cause some applications that
417  * do not set png_ptr->output_flush_fn to crash. If your application
418  * experiences a problem, please try building libpng with
419  * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
420  * png-mng-implement at lists.sf.net .
421  */
422 #ifdef PNG_WRITE_FLUSH_SUPPORTED
423 # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
424  png_flush(png_ptr);
425 # endif
426 #endif
427 }
428 
429 #ifdef PNG_CONVERT_tIME_SUPPORTED
430 /* "tm" structure is not supported on WindowsCE */
431 void PNGAPI
433 {
434  png_debug(1, "in png_convert_from_struct_tm");
435 
436  ptime->year = (png_uint_16)(1900 + ttime->tm_year);
437  ptime->month = (png_byte)(ttime->tm_mon + 1);
438  ptime->day = (png_byte)ttime->tm_mday;
439  ptime->hour = (png_byte)ttime->tm_hour;
440  ptime->minute = (png_byte)ttime->tm_min;
441  ptime->second = (png_byte)ttime->tm_sec;
442 }
443 
444 void PNGAPI
446 {
447  struct tm *tbuf;
448 
449  png_debug(1, "in png_convert_from_time_t");
450 
451  tbuf = gmtime(&ttime);
452  png_convert_from_struct_tm(ptime, tbuf);
453 }
454 #endif
455 
456 /* Initialize png_ptr structure, and allocate any memory needed */
459  png_error_ptr error_fn, png_error_ptr warn_fn)
460 {
461 #ifdef PNG_USER_MEM_SUPPORTED
462  return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
464 }
465 
466 /* Alternate initialize png_ptr structure, and allocate any memory needed */
469  png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
470  png_malloc_ptr malloc_fn, png_free_ptr free_fn)
471 {
472 #endif /* PNG_USER_MEM_SUPPORTED */
473 #ifdef PNG_SETJMP_SUPPORTED
474  volatile
475 #endif
476  png_structp png_ptr;
477 #ifdef PNG_SETJMP_SUPPORTED
478 #ifdef USE_FAR_KEYWORD
479  jmp_buf jmpbuf;
480 #endif
481 #endif
482  int i;
483 
484  png_debug(1, "in png_create_write_struct");
485 
486 #ifdef PNG_USER_MEM_SUPPORTED
487  png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
488  (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
489 #else
490  png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
491 #endif /* PNG_USER_MEM_SUPPORTED */
492  if (png_ptr == NULL)
493  return (NULL);
494 
495  /* Added at libpng-1.2.6 */
496 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
497  png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
498  png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
499 #endif
500 
501 #ifdef PNG_SETJMP_SUPPORTED
502 #ifdef USE_FAR_KEYWORD
503  if (setjmp(jmpbuf))
504 #else
505  if (setjmp(png_ptr->jmpbuf))
506 #endif
507  {
508  png_free(png_ptr, png_ptr->zbuf);
509  png_ptr->zbuf = NULL;
510 #ifdef PNG_USER_MEM_SUPPORTED
512  (png_free_ptr)free_fn, (png_voidp)mem_ptr);
513 #else
514  png_destroy_struct((png_voidp)png_ptr);
515 #endif
516  return (NULL);
517  }
518 #ifdef USE_FAR_KEYWORD
519  png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
520 #endif
521 #endif
522 
523 #ifdef PNG_USER_MEM_SUPPORTED
524  png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
525 #endif /* PNG_USER_MEM_SUPPORTED */
526  png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
527 
528  if (user_png_ver != NULL)
529  {
530  int found_dots = 0;
531  i = -1;
532 
533  do
534  {
535  i++;
536  if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i])
537  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
538  if (user_png_ver[i] == '.')
539  found_dots++;
540  } while (found_dots < 2 && user_png_ver[i] != 0 &&
541  PNG_LIBPNG_VER_STRING[i] != 0);
542  }
543  else
544  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
545 
546  if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
547  {
548  /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
549  * we must recompile any applications that use any older library version.
550  * For versions after libpng 1.0, we will be compatible, so we need
551  * only check the first digit.
552  */
553  if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
554  (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
555  (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
556  {
557 #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
558  char msg[80];
559  if (user_png_ver)
560  {
561  png_snprintf(msg, 80,
562  "Application was compiled with png.h from libpng-%.20s",
563  user_png_ver);
564  png_warning(png_ptr, msg);
565  }
566  png_snprintf(msg, 80,
567  "Application is running with png.c from libpng-%.20s",
569  png_warning(png_ptr, msg);
570 #endif
571 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
572  png_ptr->flags = 0;
573 #endif
574  png_error(png_ptr,
575  "Incompatible libpng version in application and library");
576  }
577  }
578 
579  /* Initialize zbuf - compression buffer */
580  png_ptr->zbuf_size = PNG_ZBUF_SIZE;
581  png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
582  (png_uint_32)png_ptr->zbuf_size);
583 
586 
587 #ifdef PNG_SETJMP_SUPPORTED
588  /* Applications that neglect to set up their own setjmp() and then
589  * encounter a png_error() will longjmp here. Since the jmpbuf is
590  * then meaningless we abort instead of returning.
591  */
592 #ifdef USE_FAR_KEYWORD
593  if (setjmp(jmpbuf))
594  PNG_ABORT();
595  png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
596 #else
597  if (setjmp(png_ptr->jmpbuf))
598  PNG_ABORT();
599 #endif
600 #endif
601  return (png_ptr);
602 }
603 
604 /* Initialize png_ptr structure, and allocate any memory needed */
605 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
606 /* Deprecated. */
607 #undef png_write_init
608 void PNGAPI
610 {
611  /* We only come here via pre-1.0.7-compiled applications */
612  png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
613 }
614 
615 void PNGAPI
617  png_size_t png_struct_size, png_size_t png_info_size)
618 {
619  /* We only come here via pre-1.0.12-compiled applications */
620  if (png_ptr == NULL) return;
621 #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
622  if (png_sizeof(png_struct) > png_struct_size ||
623  png_sizeof(png_info) > png_info_size)
624  {
625  char msg[80];
626  png_ptr->warning_fn = NULL;
627  if (user_png_ver)
628  {
629  png_snprintf(msg, 80,
630  "Application was compiled with png.h from libpng-%.20s",
631  user_png_ver);
632  png_warning(png_ptr, msg);
633  }
634  png_snprintf(msg, 80,
635  "Application is running with png.c from libpng-%.20s",
637  png_warning(png_ptr, msg);
638  }
639 #endif
640  if (png_sizeof(png_struct) > png_struct_size)
641  {
642  png_ptr->error_fn = NULL;
643 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
644  png_ptr->flags = 0;
645 #endif
646  png_error(png_ptr,
647  "The png struct allocated by the application for writing is"
648  " too small.");
649  }
650  if (png_sizeof(png_info) > png_info_size)
651  {
652  png_ptr->error_fn = NULL;
653 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
654  png_ptr->flags = 0;
655 #endif
656  png_error(png_ptr,
657  "The info struct allocated by the application for writing is"
658  " too small.");
659  }
660  png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
661 }
662 #endif /* PNG_1_0_X || PNG_1_2_X */
663 
664 
665 void PNGAPI
667  png_size_t png_struct_size)
668 {
669  png_structp png_ptr = *ptr_ptr;
670 #ifdef PNG_SETJMP_SUPPORTED
671  jmp_buf tmp_jmp; /* to save current jump buffer */
672 #endif
673 
674  int i = 0;
675 
676  if (png_ptr == NULL)
677  return;
678 
679  do
680  {
681  if (user_png_ver[i] != png_libpng_ver[i])
682  {
683 #ifdef PNG_LEGACY_SUPPORTED
684  png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
685 #else
686  png_ptr->warning_fn = NULL;
687  png_warning(png_ptr,
688  "Application uses deprecated png_write_init() and should be recompiled.");
689 #endif
690  }
691  i++;
692  } while (png_libpng_ver[i] != 0 && user_png_ver[i] != 0);
693 
694  png_debug(1, "in png_write_init_3");
695 
696 #ifdef PNG_SETJMP_SUPPORTED
697  /* Save jump buffer and error functions */
698  png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
699 #endif
700 
701  if (png_sizeof(png_struct) > png_struct_size)
702  {
703  png_destroy_struct(png_ptr);
704  png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
705  *ptr_ptr = png_ptr;
706  }
707 
708  /* Reset all variables to 0 */
709  png_memset(png_ptr, 0, png_sizeof(png_struct));
710 
711  /* Added at libpng-1.2.6 */
712 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
713  png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
714  png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
715 #endif
716 
717 #ifdef PNG_SETJMP_SUPPORTED
718  /* Restore jump buffer */
719  png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
720 #endif
721 
724 
725  /* Initialize zbuf - compression buffer */
726  png_ptr->zbuf_size = PNG_ZBUF_SIZE;
727  png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
728  (png_uint_32)png_ptr->zbuf_size);
729 }
730 
731 /* Write a few rows of image data. If the image is interlaced,
732  * either you will have to write the 7 sub images, or, if you
733  * have called png_set_interlace_handling(), you will have to
734  * "write" the image seven times.
735  */
736 void PNGAPI
739 {
740  png_uint_32 i; /* row counter */
741  png_bytepp rp; /* row pointer */
742 
743  png_debug(1, "in png_write_rows");
744 
745  if (png_ptr == NULL)
746  return;
747 
748  /* Loop through the rows */
749  for (i = 0, rp = row; i < num_rows; i++, rp++)
750  {
751  png_write_row(png_ptr, *rp);
752  }
753 }
754 
755 /* Write the image. You only need to call this function once, even
756  * if you are writing an interlaced image.
757  */
758 void PNGAPI
760 {
761  png_uint_32 i; /* row index */
762  int pass, num_pass; /* pass variables */
763  png_bytepp rp; /* points to current row */
764 
765  if (png_ptr == NULL)
766  return;
767 
768  png_debug(1, "in png_write_image");
769 
770 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
771  /* Initialize interlace handling. If image is not interlaced,
772  * this will set pass to 1
773  */
774  num_pass = png_set_interlace_handling(png_ptr);
775 #else
776  num_pass = 1;
777 #endif
778  /* Loop through passes */
779  for (pass = 0; pass < num_pass; pass++)
780  {
781  /* Loop through image */
782  for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
783  {
784  png_write_row(png_ptr, *rp);
785  }
786  }
787 }
788 
789 /* Called by user to write a row of image data */
790 void PNGAPI
792 {
793  if (png_ptr == NULL)
794  return;
795 
796  png_debug2(1, "in png_write_row (row %ld, pass %d)",
797  png_ptr->row_number, png_ptr->pass);
798 
799  /* Initialize transformations and other stuff if first time */
800  if (png_ptr->row_number == 0 && png_ptr->pass == 0)
801  {
802  /* Make sure we wrote the header info */
803  if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
804  png_error(png_ptr,
805  "png_write_info was never called before png_write_row.");
806 
807  /* Check for transforms that have been set but were defined out */
808 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
809  if (png_ptr->transformations & PNG_INVERT_MONO)
810  png_warning(png_ptr,
811  "PNG_WRITE_INVERT_SUPPORTED is not defined.");
812 #endif
813 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
814  if (png_ptr->transformations & PNG_FILLER)
815  png_warning(png_ptr,
816  "PNG_WRITE_FILLER_SUPPORTED is not defined.");
817 #endif
818 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
819  defined(PNG_READ_PACKSWAP_SUPPORTED)
820  if (png_ptr->transformations & PNG_PACKSWAP)
821  png_warning(png_ptr,
822  "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
823 #endif
824 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
825  if (png_ptr->transformations & PNG_PACK)
826  png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
827 #endif
828 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
829  if (png_ptr->transformations & PNG_SHIFT)
830  png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
831 #endif
832 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
833  if (png_ptr->transformations & PNG_BGR)
834  png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
835 #endif
836 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
837  if (png_ptr->transformations & PNG_SWAP_BYTES)
838  png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
839 #endif
840 
841  png_write_start_row(png_ptr);
842  }
843 
844 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
845  /* If interlaced and not interested in row, return */
846  if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
847  {
848  switch (png_ptr->pass)
849  {
850  case 0:
851  if (png_ptr->row_number & 0x07)
852  {
853  png_write_finish_row(png_ptr);
854  return;
855  }
856  break;
857  case 1:
858  if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
859  {
860  png_write_finish_row(png_ptr);
861  return;
862  }
863  break;
864  case 2:
865  if ((png_ptr->row_number & 0x07) != 4)
866  {
867  png_write_finish_row(png_ptr);
868  return;
869  }
870  break;
871  case 3:
872  if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
873  {
874  png_write_finish_row(png_ptr);
875  return;
876  }
877  break;
878  case 4:
879  if ((png_ptr->row_number & 0x03) != 2)
880  {
881  png_write_finish_row(png_ptr);
882  return;
883  }
884  break;
885  case 5:
886  if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
887  {
888  png_write_finish_row(png_ptr);
889  return;
890  }
891  break;
892  case 6:
893  if (!(png_ptr->row_number & 0x01))
894  {
895  png_write_finish_row(png_ptr);
896  return;
897  }
898  break;
899  }
900  }
901 #endif
902 
903  /* Set up row info for transformations */
904  png_ptr->row_info.color_type = png_ptr->color_type;
905  png_ptr->row_info.width = png_ptr->usr_width;
906  png_ptr->row_info.channels = png_ptr->usr_channels;
907  png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
908  png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
909  png_ptr->row_info.channels);
910 
911  png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
912  png_ptr->row_info.width);
913 
914  png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
915  png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
916  png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
917  png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
918  png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
919  png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
920 
921  /* Copy user's row into buffer, leaving room for filter byte. */
922  png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
923  png_ptr->row_info.rowbytes);
924 
925 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
926  /* Handle interlacing */
927  if (png_ptr->interlaced && png_ptr->pass < 6 &&
928  (png_ptr->transformations & PNG_INTERLACE))
929  {
930  png_do_write_interlace(&(png_ptr->row_info),
931  png_ptr->row_buf + 1, png_ptr->pass);
932  /* This should always get caught above, but still ... */
933  if (!(png_ptr->row_info.width))
934  {
935  png_write_finish_row(png_ptr);
936  return;
937  }
938  }
939 #endif
940 
941  /* Handle other transformations */
942  if (png_ptr->transformations)
944 
945 #ifdef PNG_MNG_FEATURES_SUPPORTED
946  /* Write filter_method 64 (intrapixel differencing) only if
947  * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
948  * 2. Libpng did not write a PNG signature (this filter_method is only
949  * used in PNG datastreams that are embedded in MNG datastreams) and
950  * 3. The application called png_permit_mng_features with a mask that
951  * included PNG_FLAG_MNG_FILTER_64 and
952  * 4. The filter_method is 64 and
953  * 5. The color_type is RGB or RGBA
954  */
955  if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
956  (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
957  {
958  /* Intrapixel differencing */
959  png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
960  }
961 #endif
962 
963  /* Find a filter if necessary, filter the row and write it out. */
964  png_write_find_filter(png_ptr, &(png_ptr->row_info));
965 
966  if (png_ptr->write_row_fn != NULL)
967  (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
968 }
969 
970 #ifdef PNG_WRITE_FLUSH_SUPPORTED
971 /* Set the automatic flush interval or 0 to turn flushing off */
972 void PNGAPI
974 {
975  png_debug(1, "in png_set_flush");
976 
977  if (png_ptr == NULL)
978  return;
979  png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
980 }
981 
982 /* Flush the current output buffers now */
983 void PNGAPI
985 {
986  int wrote_IDAT;
987 
988  png_debug(1, "in png_write_flush");
989 
990  if (png_ptr == NULL)
991  return;
992  /* We have already written out all of the data */
993  if (png_ptr->row_number >= png_ptr->num_rows)
994  return;
995 
996  do
997  {
998  int ret;
999 
1000  /* Compress the data */
1001  ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
1002  wrote_IDAT = 0;
1003 
1004  /* Check for compression errors */
1005  if (ret != Z_OK)
1006  {
1007  if (png_ptr->zstream.msg != NULL)
1008  png_error(png_ptr, png_ptr->zstream.msg);
1009  else
1010  png_error(png_ptr, "zlib error");
1011  }
1012 
1013  if (!(png_ptr->zstream.avail_out))
1014  {
1015  /* Write the IDAT and reset the zlib output buffer */
1016  png_write_IDAT(png_ptr, png_ptr->zbuf,
1017  png_ptr->zbuf_size);
1018  png_ptr->zstream.next_out = png_ptr->zbuf;
1019  png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1020  wrote_IDAT = 1;
1021  }
1022  } while(wrote_IDAT == 1);
1023 
1024  /* If there is any data left to be output, write it into a new IDAT */
1025  if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
1026  {
1027  /* Write the IDAT and reset the zlib output buffer */
1028  png_write_IDAT(png_ptr, png_ptr->zbuf,
1029  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1030  png_ptr->zstream.next_out = png_ptr->zbuf;
1031  png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1032  }
1033  png_ptr->flush_rows = 0;
1034  png_flush(png_ptr);
1035 }
1036 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
1037 
1038 /* Free all memory used by the write */
1039 void PNGAPI
1041 {
1042  png_structp png_ptr = NULL;
1044 #ifdef PNG_USER_MEM_SUPPORTED
1045  png_free_ptr free_fn = NULL;
1047 #endif
1048 
1049  png_debug(1, "in png_destroy_write_struct");
1050 
1051  if (png_ptr_ptr != NULL)
1052  {
1053  png_ptr = *png_ptr_ptr;
1054 #ifdef PNG_USER_MEM_SUPPORTED
1055  free_fn = png_ptr->free_fn;
1056  mem_ptr = png_ptr->mem_ptr;
1057 #endif
1058  }
1059 
1060 #ifdef PNG_USER_MEM_SUPPORTED
1061  if (png_ptr != NULL)
1062  {
1063  free_fn = png_ptr->free_fn;
1064  mem_ptr = png_ptr->mem_ptr;
1065  }
1066 #endif
1067 
1068  if (info_ptr_ptr != NULL)
1069  info_ptr = *info_ptr_ptr;
1070 
1071  if (info_ptr != NULL)
1072  {
1073  if (png_ptr != NULL)
1074  {
1075  png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
1076 
1077 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1078  if (png_ptr->num_chunk_list)
1079  {
1080  png_free(png_ptr, png_ptr->chunk_list);
1081  png_ptr->chunk_list = NULL;
1082  png_ptr->num_chunk_list = 0;
1083  }
1084 #endif
1085  }
1086 
1087 #ifdef PNG_USER_MEM_SUPPORTED
1088  png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
1089  (png_voidp)mem_ptr);
1090 #else
1091  png_destroy_struct((png_voidp)info_ptr);
1092 #endif
1093  *info_ptr_ptr = NULL;
1094  }
1095 
1096  if (png_ptr != NULL)
1097  {
1098  png_write_destroy(png_ptr);
1099 #ifdef PNG_USER_MEM_SUPPORTED
1100  png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
1101  (png_voidp)mem_ptr);
1102 #else
1103  png_destroy_struct((png_voidp)png_ptr);
1104 #endif
1105  *png_ptr_ptr = NULL;
1106  }
1107 }
1108 
1109 
1110 /* Free any memory used in png_ptr struct (old method) */
1111 void /* PRIVATE */
1113 {
1114 #ifdef PNG_SETJMP_SUPPORTED
1115  jmp_buf tmp_jmp; /* Save jump buffer */
1116 #endif
1117  png_error_ptr error_fn;
1118  png_error_ptr warning_fn;
1120 #ifdef PNG_USER_MEM_SUPPORTED
1121  png_free_ptr free_fn;
1122 #endif
1123 
1124  png_debug(1, "in png_write_destroy");
1125 
1126  /* Free any memory zlib uses */
1127  deflateEnd(&png_ptr->zstream);
1128 
1129  /* Free our memory. png_free checks NULL for us. */
1130  png_free(png_ptr, png_ptr->zbuf);
1131  png_free(png_ptr, png_ptr->row_buf);
1132 #ifdef PNG_WRITE_FILTER_SUPPORTED
1133  png_free(png_ptr, png_ptr->prev_row);
1134  png_free(png_ptr, png_ptr->sub_row);
1135  png_free(png_ptr, png_ptr->up_row);
1136  png_free(png_ptr, png_ptr->avg_row);
1137  png_free(png_ptr, png_ptr->paeth_row);
1138 #endif
1139 
1140 #ifdef PNG_TIME_RFC1123_SUPPORTED
1141  png_free(png_ptr, png_ptr->time_buffer);
1142 #endif
1143 
1144 #ifdef PNG_SETJMP_SUPPORTED
1145  /* Reset structure */
1146  png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
1147 #endif
1148 
1149  error_fn = png_ptr->error_fn;
1150  warning_fn = png_ptr->warning_fn;
1151  error_ptr = png_ptr->error_ptr;
1152 #ifdef PNG_USER_MEM_SUPPORTED
1153  free_fn = png_ptr->free_fn;
1154 #endif
1155 
1156  png_memset(png_ptr, 0, png_sizeof(png_struct));
1157 
1158  png_ptr->error_fn = error_fn;
1159  png_ptr->warning_fn = warning_fn;
1160  png_ptr->error_ptr = error_ptr;
1161 #ifdef PNG_USER_MEM_SUPPORTED
1162  png_ptr->free_fn = free_fn;
1163 #endif
1164 
1165 #ifdef PNG_SETJMP_SUPPORTED
1166  png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1167 #endif
1168 }
1169 
1170 /* Allow the application to select one or more row filters to use. */
1171 void PNGAPI
1173 {
1174  png_debug(1, "in png_set_filter");
1175 
1176  if (png_ptr == NULL)
1177  return;
1178 #ifdef PNG_MNG_FEATURES_SUPPORTED
1179  if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
1180  (method == PNG_INTRAPIXEL_DIFFERENCING))
1181  method = PNG_FILTER_TYPE_BASE;
1182 #endif
1183  if (method == PNG_FILTER_TYPE_BASE)
1184  {
1185  switch (filters & (PNG_ALL_FILTERS | 0x07))
1186  {
1187  case PNG_FILTER_VALUE_NONE:
1188  png_ptr->do_filter = PNG_FILTER_NONE; break;
1189 #ifdef PNG_WRITE_FILTER_SUPPORTED
1190  case 5:
1191  case 6:
1192  case 7: png_warning(png_ptr, "Unknown row filter for method 0");
1193  break;
1194  case PNG_FILTER_VALUE_SUB:
1195  png_ptr->do_filter = PNG_FILTER_SUB; break;
1196  case PNG_FILTER_VALUE_UP:
1197  png_ptr->do_filter = PNG_FILTER_UP; break;
1198  case PNG_FILTER_VALUE_AVG:
1199  png_ptr->do_filter = PNG_FILTER_AVG; break;
1201  png_ptr->do_filter = PNG_FILTER_PAETH; break;
1202  default: png_ptr->do_filter = (png_byte)filters; break;
1203 #else
1204  default: png_warning(png_ptr, "Unknown row filter for method 0");
1205  break;
1206 #endif /* PNG_WRITE_FILTER_SUPPORTED */
1207  }
1208 
1209  /* If we have allocated the row_buf, this means we have already started
1210  * with the image and we should have allocated all of the filter buffers
1211  * that have been selected. If prev_row isn't already allocated, then
1212  * it is too late to start using the filters that need it, since we
1213  * will be missing the data in the previous row. If an application
1214  * wants to start and stop using particular filters during compression,
1215  * it should start out with all of the filters, and then add and
1216  * remove them after the start of compression.
1217  */
1218  if (png_ptr->row_buf != NULL)
1219  {
1220 #ifdef PNG_WRITE_FILTER_SUPPORTED
1221  if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
1222  {
1223  png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
1224  (png_ptr->rowbytes + 1));
1225  png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
1226  }
1227 
1228  if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
1229  {
1230  if (png_ptr->prev_row == NULL)
1231  {
1232  png_warning(png_ptr, "Can't add Up filter after starting");
1233  png_ptr->do_filter &= ~PNG_FILTER_UP;
1234  }
1235  else
1236  {
1237  png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
1238  (png_ptr->rowbytes + 1));
1239  png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
1240  }
1241  }
1242 
1243  if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
1244  {
1245  if (png_ptr->prev_row == NULL)
1246  {
1247  png_warning(png_ptr, "Can't add Average filter after starting");
1248  png_ptr->do_filter &= ~PNG_FILTER_AVG;
1249  }
1250  else
1251  {
1252  png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
1253  (png_ptr->rowbytes + 1));
1254  png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
1255  }
1256  }
1257 
1258  if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
1259  png_ptr->paeth_row == NULL)
1260  {
1261  if (png_ptr->prev_row == NULL)
1262  {
1263  png_warning(png_ptr, "Can't add Paeth filter after starting");
1264  png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
1265  }
1266  else
1267  {
1268  png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
1269  (png_ptr->rowbytes + 1));
1270  png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
1271  }
1272  }
1273 
1274  if (png_ptr->do_filter == PNG_NO_FILTERS)
1275 #endif /* PNG_WRITE_FILTER_SUPPORTED */
1276  png_ptr->do_filter = PNG_FILTER_NONE;
1277  }
1278  }
1279  else
1280  png_error(png_ptr, "Unknown custom filter method");
1281 }
1282 
1283 /* This allows us to influence the way in which libpng chooses the "best"
1284  * filter for the current scanline. While the "minimum-sum-of-absolute-
1285  * differences metric is relatively fast and effective, there is some
1286  * question as to whether it can be improved upon by trying to keep the
1287  * filtered data going to zlib more consistent, hopefully resulting in
1288  * better compression.
1289  */
1290 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
1291 void PNGAPI
1295 {
1296  PNG_UNUSED(png_ptr)
1297  PNG_UNUSED(heuristic_method)
1298  PNG_UNUSED(num_weights)
1299  PNG_UNUSED(filter_weights)
1300  PNG_UNUSED(filter_costs)
1301 }
1302 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1303 
1304 void PNGAPI
1306 {
1307  png_debug(1, "in png_set_compression_level");
1308 
1309  if (png_ptr == NULL)
1310  return;
1311  png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
1312  png_ptr->zlib_level = level;
1313 }
1314 
1315 void PNGAPI
1317 {
1318  png_debug(1, "in png_set_compression_mem_level");
1319 
1320  if (png_ptr == NULL)
1321  return;
1322  png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
1323  png_ptr->zlib_mem_level = mem_level;
1324 }
1325 
1326 void PNGAPI
1328 {
1329  png_debug(1, "in png_set_compression_strategy");
1330 
1331  if (png_ptr == NULL)
1332  return;
1333  png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
1334  png_ptr->zlib_strategy = strategy;
1335 }
1336 
1337 void PNGAPI
1339 {
1340  if (png_ptr == NULL)
1341  return;
1342  if (window_bits > 15)
1343  png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1344  else if (window_bits < 8)
1345  png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1346 #ifndef WBITS_8_OK
1347  /* Avoid libpng bug with 256-byte windows */
1348  if (window_bits == 8)
1349  {
1350  png_warning(png_ptr, "Compression window is being reset to 512");
1351  window_bits = 9;
1352  }
1353 #endif
1354  png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
1355  png_ptr->zlib_window_bits = window_bits;
1356 }
1357 
1358 void PNGAPI
1360 {
1361  png_debug(1, "in png_set_compression_method");
1362 
1363  if (png_ptr == NULL)
1364  return;
1365  if (method != 8)
1366  png_warning(png_ptr, "Only compression method 8 is supported by PNG");
1367  png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
1368  png_ptr->zlib_method = method;
1369 }
1370 
1371 void PNGAPI
1372 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
1373 {
1374  if (png_ptr == NULL)
1375  return;
1376  png_ptr->write_row_fn = write_row_fn;
1377 }
1378 
1379 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1380 void PNGAPI
1381 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
1383 {
1384  png_debug(1, "in png_set_write_user_transform_fn");
1385 
1386  if (png_ptr == NULL)
1387  return;
1388  png_ptr->transformations |= PNG_USER_TRANSFORM;
1389  png_ptr->write_user_transform_fn = write_user_transform_fn;
1390 }
1391 #endif
1392 
1393 
1394 #ifdef PNG_INFO_IMAGE_SUPPORTED
1395 void PNGAPI
1397  int transforms, voidp params)
1398 {
1399  if (png_ptr == NULL || info_ptr == NULL)
1400  return;
1401 
1402  /* Write the file header information. */
1403  png_write_info(png_ptr, info_ptr);
1404 
1405  /* ------ these transformations don't touch the info structure ------- */
1406 
1407 #ifdef PNG_WRITE_INVERT_SUPPORTED
1408  /* Invert monochrome pixels */
1409  if (transforms & PNG_TRANSFORM_INVERT_MONO)
1410  png_set_invert_mono(png_ptr);
1411 #endif
1412 
1413 #ifdef PNG_WRITE_SHIFT_SUPPORTED
1414  /* Shift the pixels up to a legal bit depth and fill in
1415  * as appropriate to correctly scale the image.
1416  */
1417  if ((transforms & PNG_TRANSFORM_SHIFT)
1418  && (info_ptr->valid & PNG_INFO_sBIT))
1419  png_set_shift(png_ptr, &info_ptr->sig_bit);
1420 #endif
1421 
1422 #ifdef PNG_WRITE_PACK_SUPPORTED
1423  /* Pack pixels into bytes */
1424  if (transforms & PNG_TRANSFORM_PACKING)
1425  png_set_packing(png_ptr);
1426 #endif
1427 
1428 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1429  /* Swap location of alpha bytes from ARGB to RGBA */
1430  if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1431  png_set_swap_alpha(png_ptr);
1432 #endif
1433 
1434 #ifdef PNG_WRITE_FILLER_SUPPORTED
1435  /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
1436  if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
1437  png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
1438  else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
1439  png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
1440 #endif
1441 
1442 #ifdef PNG_WRITE_BGR_SUPPORTED
1443  /* Flip BGR pixels to RGB */
1444  if (transforms & PNG_TRANSFORM_BGR)
1445  png_set_bgr(png_ptr);
1446 #endif
1447 
1448 #ifdef PNG_WRITE_SWAP_SUPPORTED
1449  /* Swap bytes of 16-bit files to most significant byte first */
1450  if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1451  png_set_swap(png_ptr);
1452 #endif
1453 
1454 #ifdef PNG_WRITE_PACKSWAP_SUPPORTED
1455  /* Swap bits of 1, 2, 4 bit packed pixel formats */
1456  if (transforms & PNG_TRANSFORM_PACKSWAP)
1457  png_set_packswap(png_ptr);
1458 #endif
1459 
1460 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1461  /* Invert the alpha channel from opacity to transparency */
1462  if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1463  png_set_invert_alpha(png_ptr);
1464 #endif
1465 
1466  /* ----------------------- end of transformations ------------------- */
1467 
1468  /* Write the bits */
1469  if (info_ptr->valid & PNG_INFO_IDAT)
1470  png_write_image(png_ptr, info_ptr->row_pointers);
1471 
1472  /* It is REQUIRED to call this to finish writing the rest of the file */
1473  png_write_end(png_ptr, info_ptr);
1474 
1475  PNG_UNUSED(transforms) /* Quiet compiler warnings */
1476  PNG_UNUSED(params)
1477 }
1478 #endif
1479 #endif /* PNG_WRITE_SUPPORTED */
void png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
Definition: pngwutil.c:1499
int heuristic_method
Definition: png.h:1747
void png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
Definition: pngwtran.c:524
#define PNG_FILTER_VALUE_AVG
Definition: png.h:1740
void PNGAPI png_write_chunk(png_structp png_ptr, png_bytep chunk_name, png_bytep data, png_size_t length)
Definition: pngwutil.c:84
void PNGAPI png_set_packing(png_structp png_ptr)
Definition: pngtrans.c:49
PNG_CONST char png_libpng_ver[18]
Definition: png.c:28
#define PNG_USER_WIDTH_MAX
Definition: pngconf.h:873
void PNGAPI png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, int num_weights, png_doublep filter_weights, png_doublep filter_costs)
Definition: pngwrite.c:1292
#define PNG_TRANSFORM_SWAP_ENDIAN
Definition: png.h:1015
void png_write_start_row(png_structp png_ptr)
Definition: pngwutil.c:1630
unsigned int uInt
Definition: zconf.h:221
png_voidp png_error_ptr png_error_ptr png_voidp png_malloc_ptr malloc_fn
Definition: png.h:1401
void PNGAPI png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
Definition: png.c:364
void PNGAPI png_write_image(png_structp png_ptr, png_bytepp image)
Definition: pngwrite.c:759
png_voidp png_create_struct(int type)
Definition: pngmem.c:348
png_voidp error_ptr
Definition: png.h:1377
void PNGAPI png_write_png(png_structp png_ptr, png_infop info_ptr, int transforms, voidp params)
Definition: pngwrite.c:1396
#define PNG_INFO_gAMA
Definition: png.h:932
#define png_snprintf
Definition: pngconf.h:1643
void png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
Definition: pngwutil.c:1190
#define PNG_FILLER_BEFORE
Definition: png.h:1528
void PNGAPI png_set_flush(png_structp png_ptr, int nrows)
Definition: pngwrite.c:973
#define PNG_INFO_tIME
Definition: png.h:941
#define PNG_FILTER_PAETH
Definition: png.h:1730
#define PNG_INFO_sRGB
Definition: png.h:943
png_infop int transforms
Definition: png.h:2354
#define PNG_NO_FILTERS
Definition: png.h:1725
void PNGAPI png_set_compression_level(png_structp png_ptr, int level)
Definition: pngwrite.c:1305
int int png_doublep filter_weights
Definition: png.h:1747
#define PNG_FILTER_SUB
Definition: png.h:1727
#define NULL
Definition: ftobjs.h:61
#define PNG_INFO_hIST
Definition: png.h:938
png_infopp info_ptr_ptr
Definition: png.h:1669
#define PNG_TRANSFORM_INVERT_MONO
Definition: png.h:1011
png_voidp png_malloc_ptr png_free_ptr free_fn
Definition: png.h:1837
png_user_transform_ptr write_user_transform_fn
Definition: png.h:1851
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:618
#define png_malloc_ptr_NULL
Definition: png.h:370
void PNGAPI png_set_invert_alpha(png_structp png_ptr)
Definition: pngtrans.c:182
Byte * voidp
Definition: zconf.h:240
#define PNG_TRANSFORM_PACKSWAP
Definition: png.h:1009
GLenum GLsizei GLenum GLenum const GLvoid * image
void png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
Definition: pngwutil.c:733
void PNGAPI png_write_rows(png_structp png_ptr, png_bytepp row, png_uint_32 num_rows)
Definition: pngwrite.c:737
png_byte FAR * png_bytep
Definition: pngconf.h:1328
#define png_memset
Definition: pngconf.h:1662
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:869
void png_write_sig(png_structp png_ptr)
Definition: pngwutil.c:63
#define PNG_UNUSED(param)
Definition: pngconf.h:97
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:1741
#define PNG_LIBPNG_VER_STRING
Definition: png.h:273
#define PNG_TRANSFORM_BGR
Definition: png.h:1013
#define PNG_HAVE_PLTE
Definition: png.h:2665
#define png_rw_ptr_NULL
Definition: png.h:372
void png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
Definition: pngwutil.c:934
int PNGAPI png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
Definition: png.c:792
void png_do_write_transformations(png_structp png_ptr)
Definition: pngwtran.c:23
PNG_CONST char FAR * png_const_charp
Definition: pngconf.h:1333
void PNGAPI png_set_compression_strategy(png_structp png_ptr, int strategy)
Definition: pngwrite.c:1327
int ZEXPORT deflateEnd(z_streamp strm)
Definition: deflate.c:979
void png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, int unit_type)
Definition: pngwutil.c:1412
#define PNG_USER_HEIGHT_MAX
Definition: pngconf.h:876
void png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
Definition: pngwutil.c:643
#define PNG_TRANSFORM_STRIP_FILLER_AFTER
Definition: png.h:1020
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:188
#define PNG_TEXT_COMPRESSION_NONE_WR
Definition: png.h:523
png_voidp png_error_ptr png_error_ptr warning_fn
Definition: png.h:1803
png_uint_32 i
Definition: png.h:2640
#define PNG_INFO_oFFs
Definition: png.h:940
void png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type, png_charp profile, int profile_len)
Definition: pngwutil.c:772
png_struct FAR *FAR * png_structpp
Definition: png.h:1345
#define PNG_WRITE_INTERLACING_SUPPORTED
Definition: pngconf.h:743
void png_flush(png_structp png_ptr)
Definition: pngwio.c:135
int int png_doublep png_doublep filter_costs
Definition: png.h:1747
png_write_status_ptr write_row_fn
Definition: png.h:1832
void png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text, png_size_t text_len)
Definition: pngwutil.c:1222
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:1573
#define Z_OK
Definition: zlib.h:132
GLenum GLenum GLvoid * row
void PNGAPI png_set_bgr(png_structp png_ptr)
Definition: pngtrans.c:22
png_byte FAR *FAR * png_bytepp
Definition: pngconf.h:1350
#define PNG_TEXT_COMPRESSION_zTXt
Definition: png.h:526
void PNGAPI png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr write_user_transform_fn)
Definition: pngwrite.c:1381
void png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
Definition: pngwutil.c:853
#define PNG_ZBUF_SIZE
Definition: pngconf.h:115
#define PNG_TEXT_COMPRESSION_NONE
Definition: png.h:525
#define png_debug(l, m)
Definition: png.h:2461
#define PNGAPI
Definition: pngconf.h:1517
png_struct FAR * png_structp
Definition: png.h:973
void PNGAPI png_write_info(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:135
#define PNG_HANDLE_CHUNK_ALWAYS
Definition: png.h:2484
#define png_error(s1, s2)
Definition: pngusr.h:25
void PNGAPI png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
Definition: pngtrans.c:114
#define Z_SYNC_FLUSH
Definition: zlib.h:127
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:1040
#define PNG_FREE_ALL
Definition: png.h:1945
png_time FAR * png_timep
Definition: png.h:546
int JSAMPARRAY int int num_rows
Definition: jpegint.h:373
void PNGAPI png_set_packswap(png_structp png_ptr)
Definition: pngtrans.c:66
GLint level
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE
Definition: png.h:1019
void png_destroy_struct(png_voidp struct_ptr)
Definition: pngmem.c:402
void PNGAPI png_set_swap(png_structp png_ptr)
Definition: pngtrans.c:35
void PNGAPI png_write_flush(png_structp png_ptr)
Definition: pngwrite.c:984
int method
Definition: png.h:1717
void png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
Definition: pngwutil.c:2022
png_voidp png_error_ptr error_fn
Definition: png.h:1377
int strategy
Definition: png.h:1772
png_timep ptime
Definition: png.h:1455
int int filters
Definition: png.h:1717
unsigned char png_byte
Definition: pngconf.h:1251
#define png_memcpy
Definition: pngconf.h:1661
unsigned short png_uint_16
Definition: pngconf.h:1249
void PNGAPI png_set_compression_mem_level(png_structp png_ptr, int mem_level)
Definition: pngwrite.c:1316
#define PNG_FILTER_VALUE_SUB
Definition: png.h:1738
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:392
#define png_flush_ptr_NULL
Definition: png.h:367
void png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran, int num_trans, int color_type)
Definition: pngwutil.c:1079
void PNGAPI png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t png_info_size)
Definition: pngwrite.c:616
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:111
#define PNG_ALL_FILTERS
Definition: png.h:1731
void PNGAPI png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
Definition: pngwrite.c:1372
void png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
Definition: pngwutil.c:1435
void png_write_gAMA(png_structp png_ptr, double file_gamma)
Definition: pngwutil.c:715
void PNGAPI png_convert_from_struct_tm(png_timep ptime, struct tm FAR *ttime)
Definition: pngwrite.c:432
png_structp PNGAPI png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Definition: pngwrite.c:468
void PNGAPI png_write_end(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:315
#define FAR
Definition: zconf.h:215
int nrows
Definition: png.h:1614
#define PNG_FILTER_UP
Definition: png.h:1728
#define PNG_HAVE_IDAT
Definition: png.h:2666
#define PNG_FILTER_AVG
Definition: png.h:1729
#define PNG_INFO_sBIT
Definition: png.h:933
#define PNG_AFTER_IDAT
Definition: png.h:2667
#define PNG_TRANSFORM_PACKING
Definition: png.h:1008
#define PNG_TRANSFORM_INVERT_ALPHA
Definition: png.h:1016
#define png_debug1(l, m, p1)
Definition: png.h:2464
void PNGAPI png_set_compression_window_bits(png_structp png_ptr, int window_bits)
Definition: pngwrite.c:1338
png_byte location
Definition: png.h:564
#define PNG_FILTER_VALUE_UP
Definition: png.h:1739
int ZEXPORT deflate(z_streamp strm, int flush)
Definition: deflate.c:665
void PNGAPI png_set_invert_mono(png_structp png_ptr)
Definition: pngtrans.c:194
#define PNG_FLAG_MNG_FILTER_64
Definition: png.h:1026
#define PNG_INFO_PLTE
Definition: png.h:935
#define PNG_FILTER_TYPE_BASE
Definition: png.h:882
void png_write_destroy(png_structp png_ptr)
Definition: pngwrite.c:1112
void png_write_tIME(png_structp png_ptr, png_timep mod_time)
Definition: pngwutil.c:1600
typedef int
Definition: png.h:978
#define PNG_TEXT_COMPRESSION_zTXt_WR
Definition: png.h:524
GLenum const GLfloat * params
png_voidp png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
Definition: pngmem.c:358
#define png_free_ptr_NULL
Definition: png.h:368
#define PNG_INFO_IDAT
Definition: png.h:947
void png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
Definition: pngwutil.c:573
#define PNG_COMPRESSION_TYPE_BASE
Definition: png.h:878
void png_write_sRGB(png_structp png_ptr, int srgb_intent)
Definition: pngwutil.c:752
#define png_voidp_NULL
Definition: png.h:375
void PNGAPI png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
Definition: pngwrite.c:30
#define PNG_INFO_tRNS
Definition: png.h:936
png_voidp png_error_ptr png_error_ptr warn_fn
Definition: png.h:1401
png_voidp PNGAPI png_memcpy_check(png_structp png_ptr, png_voidp s1, png_voidp s2, png_uint_32 length)
Definition: pngmem.c:587
void PNGAPI png_convert_from_time_t(png_timep ptime, time_t ttime)
Definition: pngwrite.c:445
struct tm FAR * ttime
Definition: png.h:1461
void PNGAPI png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
Definition: pngwrite.c:1040
int PNGAPI png_set_interlace_handling(png_structp png_ptr)
Definition: pngtrans.c:93
void FAR * png_voidp
Definition: pngconf.h:1327
void png_write_IEND(png_structp png_ptr)
Definition: pngwutil.c:698
void PNGAPI png_write_row(png_structp png_ptr, png_bytep row)
Definition: pngwrite.c:791
void PNGAPI png_set_shift(png_structp png_ptr, png_color_8p true_bits)
Definition: pngtrans.c:79
int int num_weights
Definition: png.h:1747
#define PNG_TRANSFORM_SWAP_ALPHA
Definition: png.h:1014
void png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
Definition: pngwutil.c:1136
void png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, png_voidp mem_ptr)
Definition: pngmem.c:410
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)
Definition: pngwrite.c:458
png_byte name[PNG_CHUNK_NAME_LENGTH]
Definition: png.h:559
#define PNG_FILLER_AFTER
Definition: png.h:1529
#define PNG_FILTER_VALUE_NONE
Definition: png.h:1737
size_t png_size_t
Definition: pngconf.h:1259
void PNGAPI png_write_init(png_structp png_ptr)
Definition: pngwrite.c:609
double FAR * png_doublep
Definition: pngconf.h:1346
#define PNG_INTRAPIXEL_DIFFERENCING
Definition: png.h:883
void PNGAPI png_set_compression_method(png_structp png_ptr, int method)
Definition: pngwrite.c:1359
#define PNG_INFO_sPLT
Definition: png.h:945
int mem_level
Definition: png.h:1769
void png_write_finish_row(png_structp png_ptr)
Definition: pngwutil.c:1730
png_infop info_ptr
Definition: png.h:1443
unsigned long png_uint_32
Definition: pngconf.h:1247
#define PNG_ABORT()
Definition: pngconf.h:1613
#define PNG_FILTER_NONE
Definition: png.h:1726
png_byte * data
Definition: png.h:560
void png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text, png_size_t text_len, int compression)
Definition: pngwutil.c:1263
png_voidp png_error_ptr png_error_ptr png_voidp mem_ptr
Definition: png.h:1401
png_info FAR *FAR * png_infopp
Definition: png.h:850
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
Definition: pngmem.c:527
#define png_debug2(l, m, p1, p2)
Definition: png.h:2467
#define PNG_INFO_pHYs
Definition: png.h:939
void PNGAPI png_set_swap_alpha(png_structp png_ptr)
Definition: pngtrans.c:169
#define PNG_INFO_pCAL
Definition: png.h:942
#define PNG_TRANSFORM_SHIFT
Definition: png.h:1012
#define PNG_INFO_cHRM
Definition: png.h:934
void PNGAPI png_set_filter(png_structp png_ptr, int method, int filters)
Definition: pngwrite.c:1172
#define PNG_INFO_bKGD
Definition: png.h:937
void png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
Definition: pngwutil.c:1850
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:361
int window_bits
Definition: png.h:1775
#define PNG_HANDLE_CHUNK_NEVER
Definition: png.h:2482
png_voidp PNGAPI png_malloc(png_structp png_ptr, png_uint_32 size)
Definition: pngmem.c:457
#define PNG_INFO_iCCP
Definition: png.h:944
int keep
Definition: png.h:2331
void png_write_cHRM(png_structp png_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y)
Definition: pngwutil.c:992
#define png_sizeof(x)
Definition: pngconf.h:1260
#define PNG_INFO_sCAL
Definition: png.h:946
void PNGAPI png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, png_size_t png_struct_size)
Definition: pngwrite.c:666
png_size_t size
Definition: png.h:561
png_info FAR * png_infop
Definition: png.h:849
png_const_charp msg
Definition: PngFile.c:23