/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/pngwrite.c
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Annotation of /trunk/3rdparty/wxWidgets/src/png/pngwrite.c

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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 5 months ago) by william
File MIME type: text/plain
File size: 50054 byte(s)
committing r3113 initial commit again...
1 william 31
2     /* pngwrite.c - general routines to write a PNG file
3     *
4     * Last changed in libpng 1.2.37 [June 4, 2009]
5     * Copyright (c) 1998-2009 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     #include "png.h"
17     #ifdef PNG_WRITE_SUPPORTED
18    
19     /* Writes all the PNG information. This is the suggested way to use the
20     * library. If you have a new chunk to add, make a function to write it,
21     * and put it in the correct location here. If you want the chunk written
22     * after the image data, put it in png_write_end(). I strongly encourage
23     * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
24     * the chunk, as that will keep the code from breaking if you want to just
25     * write a plain PNG file. If you have long comments, I suggest writing
26     * them in png_write_end(), and compressing them.
27     */
28     void PNGAPI
29     png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
30     {
31     png_debug(1, "in png_write_info_before_PLTE");
32     if (png_ptr == NULL || info_ptr == NULL)
33     return;
34     if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
35     {
36     png_write_sig(png_ptr); /* Write PNG signature */
37     #if defined(PNG_MNG_FEATURES_SUPPORTED)
38     if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
39     {
40     png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
41     png_ptr->mng_features_permitted=0;
42     }
43     #endif
44     /* Write IHDR information. */
45     png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
46     info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
47     info_ptr->filter_type,
48     #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
49     info_ptr->interlace_type);
50     #else
51     0);
52     #endif
53     /* The rest of these check to see if the valid field has the appropriate
54     * flag set, and if it does, writes the chunk.
55     */
56     #if defined(PNG_WRITE_gAMA_SUPPORTED)
57     if (info_ptr->valid & PNG_INFO_gAMA)
58     {
59     # ifdef PNG_FLOATING_POINT_SUPPORTED
60     png_write_gAMA(png_ptr, info_ptr->gamma);
61     #else
62     #ifdef PNG_FIXED_POINT_SUPPORTED
63     png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
64     # endif
65     #endif
66     }
67     #endif
68     #if defined(PNG_WRITE_sRGB_SUPPORTED)
69     if (info_ptr->valid & PNG_INFO_sRGB)
70     png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
71     #endif
72     #if defined(PNG_WRITE_iCCP_SUPPORTED)
73     if (info_ptr->valid & PNG_INFO_iCCP)
74     png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
75     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
76     #endif
77     #if defined(PNG_WRITE_sBIT_SUPPORTED)
78     if (info_ptr->valid & PNG_INFO_sBIT)
79     png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
80     #endif
81     #if defined(PNG_WRITE_cHRM_SUPPORTED)
82     if (info_ptr->valid & PNG_INFO_cHRM)
83     {
84     #ifdef PNG_FLOATING_POINT_SUPPORTED
85     png_write_cHRM(png_ptr,
86     info_ptr->x_white, info_ptr->y_white,
87     info_ptr->x_red, info_ptr->y_red,
88     info_ptr->x_green, info_ptr->y_green,
89     info_ptr->x_blue, info_ptr->y_blue);
90     #else
91     # ifdef PNG_FIXED_POINT_SUPPORTED
92     png_write_cHRM_fixed(png_ptr,
93     info_ptr->int_x_white, info_ptr->int_y_white,
94     info_ptr->int_x_red, info_ptr->int_y_red,
95     info_ptr->int_x_green, info_ptr->int_y_green,
96     info_ptr->int_x_blue, info_ptr->int_y_blue);
97     # endif
98     #endif
99     }
100     #endif
101     #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
102     if (info_ptr->unknown_chunks_num)
103     {
104     png_unknown_chunk *up;
105    
106     png_debug(5, "writing extra chunks");
107    
108     for (up = info_ptr->unknown_chunks;
109     up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
110     up++)
111     {
112     int keep=png_handle_as_unknown(png_ptr, up->name);
113     if (keep != PNG_HANDLE_CHUNK_NEVER &&
114     up->location && !(up->location & PNG_HAVE_PLTE) &&
115     !(up->location & PNG_HAVE_IDAT) &&
116     ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
117     (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
118     {
119     if (up->size == 0)
120     png_warning(png_ptr, "Writing zero-length unknown chunk");
121     png_write_chunk(png_ptr, up->name, up->data, up->size);
122     }
123     }
124     }
125     #endif
126     png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
127     }
128     }
129    
130     void PNGAPI
131     png_write_info(png_structp png_ptr, png_infop info_ptr)
132     {
133     #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
134     int i;
135     #endif
136    
137     png_debug(1, "in png_write_info");
138    
139     if (png_ptr == NULL || info_ptr == NULL)
140     return;
141    
142     png_write_info_before_PLTE(png_ptr, info_ptr);
143    
144     if (info_ptr->valid & PNG_INFO_PLTE)
145     png_write_PLTE(png_ptr, info_ptr->palette,
146     (png_uint_32)info_ptr->num_palette);
147     else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
148     png_error(png_ptr, "Valid palette required for paletted images");
149    
150     #if defined(PNG_WRITE_tRNS_SUPPORTED)
151     if (info_ptr->valid & PNG_INFO_tRNS)
152     {
153     #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
154     /* Invert the alpha channel (in tRNS) */
155     if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
156     info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
157     {
158     int j;
159     for (j=0; j<(int)info_ptr->num_trans; j++)
160     info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
161     }
162     #endif
163     png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
164     info_ptr->num_trans, info_ptr->color_type);
165     }
166     #endif
167     #if defined(PNG_WRITE_bKGD_SUPPORTED)
168     if (info_ptr->valid & PNG_INFO_bKGD)
169     png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
170     #endif
171     #if defined(PNG_WRITE_hIST_SUPPORTED)
172     if (info_ptr->valid & PNG_INFO_hIST)
173     png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
174     #endif
175     #if defined(PNG_WRITE_oFFs_SUPPORTED)
176     if (info_ptr->valid & PNG_INFO_oFFs)
177     png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
178     info_ptr->offset_unit_type);
179     #endif
180     #if defined(PNG_WRITE_pCAL_SUPPORTED)
181     if (info_ptr->valid & PNG_INFO_pCAL)
182     png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
183     info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
184     info_ptr->pcal_units, info_ptr->pcal_params);
185     #endif
186    
187     #if defined(PNG_sCAL_SUPPORTED)
188     if (info_ptr->valid & PNG_INFO_sCAL)
189     #if defined(PNG_WRITE_sCAL_SUPPORTED)
190     #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
191     png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
192     info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
193     #else /* !FLOATING_POINT */
194     #ifdef PNG_FIXED_POINT_SUPPORTED
195     png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
196     info_ptr->scal_s_width, info_ptr->scal_s_height);
197     #endif /* FIXED_POINT */
198     #endif /* FLOATING_POINT */
199     #else /* !WRITE_sCAL */
200     png_warning(png_ptr,
201     "png_write_sCAL not supported; sCAL chunk not written.");
202     #endif /* WRITE_sCAL */
203     #endif /* sCAL */
204    
205     #if defined(PNG_WRITE_pHYs_SUPPORTED)
206     if (info_ptr->valid & PNG_INFO_pHYs)
207     png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
208     info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
209     #endif /* pHYs */
210    
211     #if defined(PNG_WRITE_tIME_SUPPORTED)
212     if (info_ptr->valid & PNG_INFO_tIME)
213     {
214     png_write_tIME(png_ptr, &(info_ptr->mod_time));
215     png_ptr->mode |= PNG_WROTE_tIME;
216     }
217     #endif /* tIME */
218    
219     #if defined(PNG_WRITE_sPLT_SUPPORTED)
220     if (info_ptr->valid & PNG_INFO_sPLT)
221     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
222     png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
223     #endif /* sPLT */
224    
225     #if defined(PNG_WRITE_TEXT_SUPPORTED)
226     /* Check to see if we need to write text chunks */
227     for (i = 0; i < info_ptr->num_text; i++)
228     {
229     png_debug2(2, "Writing header text chunk %d, type %d", i,
230     info_ptr->text[i].compression);
231     /* An internationalized chunk? */
232     if (info_ptr->text[i].compression > 0)
233     {
234     #if defined(PNG_WRITE_iTXt_SUPPORTED)
235     /* Write international chunk */
236     png_write_iTXt(png_ptr,
237     info_ptr->text[i].compression,
238     info_ptr->text[i].key,
239     info_ptr->text[i].lang,
240     info_ptr->text[i].lang_key,
241     info_ptr->text[i].text);
242     #else
243     png_warning(png_ptr, "Unable to write international text");
244     #endif
245     /* Mark this chunk as written */
246     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
247     }
248     /* If we want a compressed text chunk */
249     else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
250     {
251     #if defined(PNG_WRITE_zTXt_SUPPORTED)
252     /* Write compressed chunk */
253     png_write_zTXt(png_ptr, info_ptr->text[i].key,
254     info_ptr->text[i].text, 0,
255     info_ptr->text[i].compression);
256     #else
257     png_warning(png_ptr, "Unable to write compressed text");
258     #endif
259     /* Mark this chunk as written */
260     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
261     }
262     else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
263     {
264     #if defined(PNG_WRITE_tEXt_SUPPORTED)
265     /* Write uncompressed chunk */
266     png_write_tEXt(png_ptr, info_ptr->text[i].key,
267     info_ptr->text[i].text,
268     0);
269     /* Mark this chunk as written */
270     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
271     #else
272     /* Can't get here */
273     png_warning(png_ptr, "Unable to write uncompressed text");
274     #endif
275     }
276     }
277     #endif /* tEXt */
278    
279     #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
280     if (info_ptr->unknown_chunks_num)
281     {
282     png_unknown_chunk *up;
283    
284     png_debug(5, "writing extra chunks");
285    
286     for (up = info_ptr->unknown_chunks;
287     up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
288     up++)
289     {
290     int keep=png_handle_as_unknown(png_ptr, up->name);
291     if (keep != PNG_HANDLE_CHUNK_NEVER &&
292     up->location && (up->location & PNG_HAVE_PLTE) &&
293     !(up->location & PNG_HAVE_IDAT) &&
294     ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
295     (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
296     {
297     png_write_chunk(png_ptr, up->name, up->data, up->size);
298     }
299     }
300     }
301     #endif
302     }
303    
304     /* Writes the end of the PNG file. If you don't want to write comments or
305     * time information, you can pass NULL for info. If you already wrote these
306     * in png_write_info(), do not write them again here. If you have long
307     * comments, I suggest writing them here, and compressing them.
308     */
309     void PNGAPI
310     png_write_end(png_structp png_ptr, png_infop info_ptr)
311     {
312     png_debug(1, "in png_write_end");
313     if (png_ptr == NULL)
314     return;
315     if (!(png_ptr->mode & PNG_HAVE_IDAT))
316     png_error(png_ptr, "No IDATs written into file");
317    
318     /* See if user wants us to write information chunks */
319     if (info_ptr != NULL)
320     {
321     #if defined(PNG_WRITE_TEXT_SUPPORTED)
322     int i; /* Local index variable */
323     #endif
324     #if defined(PNG_WRITE_tIME_SUPPORTED)
325     /* Check to see if user has supplied a time chunk */
326     if ((info_ptr->valid & PNG_INFO_tIME) &&
327     !(png_ptr->mode & PNG_WROTE_tIME))
328     png_write_tIME(png_ptr, &(info_ptr->mod_time));
329     #endif
330     #if defined(PNG_WRITE_TEXT_SUPPORTED)
331     /* Loop through comment chunks */
332     for (i = 0; i < info_ptr->num_text; i++)
333     {
334     png_debug2(2, "Writing trailer text chunk %d, type %d", i,
335     info_ptr->text[i].compression);
336     /* An internationalized chunk? */
337     if (info_ptr->text[i].compression > 0)
338     {
339     #if defined(PNG_WRITE_iTXt_SUPPORTED)
340     /* Write international chunk */
341     png_write_iTXt(png_ptr,
342     info_ptr->text[i].compression,
343     info_ptr->text[i].key,
344     info_ptr->text[i].lang,
345     info_ptr->text[i].lang_key,
346     info_ptr->text[i].text);
347     #else
348     png_warning(png_ptr, "Unable to write international text");
349     #endif
350     /* Mark this chunk as written */
351     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
352     }
353     else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
354     {
355     #if defined(PNG_WRITE_zTXt_SUPPORTED)
356     /* Write compressed chunk */
357     png_write_zTXt(png_ptr, info_ptr->text[i].key,
358     info_ptr->text[i].text, 0,
359     info_ptr->text[i].compression);
360     #else
361     png_warning(png_ptr, "Unable to write compressed text");
362     #endif
363     /* Mark this chunk as written */
364     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
365     }
366     else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
367     {
368     #if defined(PNG_WRITE_tEXt_SUPPORTED)
369     /* Write uncompressed chunk */
370     png_write_tEXt(png_ptr, info_ptr->text[i].key,
371     info_ptr->text[i].text, 0);
372     #else
373     png_warning(png_ptr, "Unable to write uncompressed text");
374     #endif
375    
376     /* Mark this chunk as written */
377     info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
378     }
379     }
380     #endif
381     #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
382     if (info_ptr->unknown_chunks_num)
383     {
384     png_unknown_chunk *up;
385    
386     png_debug(5, "writing extra chunks");
387    
388     for (up = info_ptr->unknown_chunks;
389     up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
390     up++)
391     {
392     int keep=png_handle_as_unknown(png_ptr, up->name);
393     if (keep != PNG_HANDLE_CHUNK_NEVER &&
394     up->location && (up->location & PNG_AFTER_IDAT) &&
395     ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
396     (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
397     {
398     png_write_chunk(png_ptr, up->name, up->data, up->size);
399     }
400     }
401     }
402     #endif
403     }
404    
405     png_ptr->mode |= PNG_AFTER_IDAT;
406    
407     /* Write end of PNG file */
408     png_write_IEND(png_ptr);
409     /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
410     * and restored again in libpng-1.2.30, may cause some applications that
411     * do not set png_ptr->output_flush_fn to crash. If your application
412     * experiences a problem, please try building libpng with
413     * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
414     * png-mng-implement at lists.sf.net . This kludge will be removed
415     * from libpng-1.4.0.
416     */
417     #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
418     defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
419     png_flush(png_ptr);
420     #endif
421     }
422    
423     #if defined(PNG_WRITE_tIME_SUPPORTED)
424     #if !defined(_WIN32_WCE)
425     /* "time.h" functions are not supported on WindowsCE */
426     void PNGAPI
427     png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
428     {
429     png_debug(1, "in png_convert_from_struct_tm");
430     ptime->year = (png_uint_16)(1900 + ttime->tm_year);
431     ptime->month = (png_byte)(ttime->tm_mon + 1);
432     ptime->day = (png_byte)ttime->tm_mday;
433     ptime->hour = (png_byte)ttime->tm_hour;
434     ptime->minute = (png_byte)ttime->tm_min;
435     ptime->second = (png_byte)ttime->tm_sec;
436     }
437    
438     void PNGAPI
439     png_convert_from_time_t(png_timep ptime, time_t ttime)
440     {
441     struct tm *tbuf;
442    
443     png_debug(1, "in png_convert_from_time_t");
444     tbuf = gmtime(&ttime);
445     png_convert_from_struct_tm(ptime, tbuf);
446     }
447     #endif
448     #endif
449    
450     /* Initialize png_ptr structure, and allocate any memory needed */
451     png_structp PNGAPI
452     png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
453     png_error_ptr error_fn, png_error_ptr warn_fn)
454     {
455     #ifdef PNG_USER_MEM_SUPPORTED
456     return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
457     warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
458     }
459    
460     /* Alternate initialize png_ptr structure, and allocate any memory needed */
461     png_structp PNGAPI
462     png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
463     png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
464     png_malloc_ptr malloc_fn, png_free_ptr free_fn)
465     {
466     #endif /* PNG_USER_MEM_SUPPORTED */
467     #ifdef PNG_SETJMP_SUPPORTED
468     volatile
469     #endif
470     png_structp png_ptr;
471     #ifdef PNG_SETJMP_SUPPORTED
472     #ifdef USE_FAR_KEYWORD
473     jmp_buf jmpbuf;
474     #endif
475     #endif
476     int i;
477     png_debug(1, "in png_create_write_struct");
478     #ifdef PNG_USER_MEM_SUPPORTED
479     png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
480     (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
481     #else
482     png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
483     #endif /* PNG_USER_MEM_SUPPORTED */
484     if (png_ptr == NULL)
485     return (NULL);
486    
487     /* Added at libpng-1.2.6 */
488     #ifdef PNG_SET_USER_LIMITS_SUPPORTED
489     png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
490     png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
491     #endif
492    
493     #ifdef PNG_SETJMP_SUPPORTED
494     #ifdef USE_FAR_KEYWORD
495     if (setjmp(jmpbuf))
496     #else
497     if (setjmp(png_ptr->jmpbuf))
498     #endif
499     {
500     png_free(png_ptr, png_ptr->zbuf);
501     png_ptr->zbuf=NULL;
502     png_destroy_struct(png_ptr);
503     return (NULL);
504     }
505     #ifdef USE_FAR_KEYWORD
506     png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
507     #endif
508     #endif
509    
510     #ifdef PNG_USER_MEM_SUPPORTED
511     png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
512     #endif /* PNG_USER_MEM_SUPPORTED */
513     png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
514    
515     if (user_png_ver)
516     {
517     i=0;
518     do
519     {
520     if (user_png_ver[i] != png_libpng_ver[i])
521     png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
522     } while (png_libpng_ver[i++]);
523     }
524    
525     if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
526     {
527     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
528     * we must recompile any applications that use any older library version.
529     * For versions after libpng 1.0, we will be compatible, so we need
530     * only check the first digit.
531     */
532     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
533     (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
534     (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
535     {
536     #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
537     char msg[80];
538     if (user_png_ver)
539     {
540     png_snprintf(msg, 80,
541     "Application was compiled with png.h from libpng-%.20s",
542     user_png_ver);
543     png_warning(png_ptr, msg);
544     }
545     png_snprintf(msg, 80,
546     "Application is running with png.c from libpng-%.20s",
547     png_libpng_ver);
548     png_warning(png_ptr, msg);
549     #endif
550     #ifdef PNG_ERROR_NUMBERS_SUPPORTED
551     png_ptr->flags=0;
552     #endif
553     png_error(png_ptr,
554     "Incompatible libpng version in application and library");
555     }
556     }
557    
558     /* Initialize zbuf - compression buffer */
559     png_ptr->zbuf_size = PNG_ZBUF_SIZE;
560     png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
561     (png_uint_32)png_ptr->zbuf_size);
562    
563     png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
564     png_flush_ptr_NULL);
565    
566     #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
567     png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
568     1, png_doublep_NULL, png_doublep_NULL);
569     #endif
570    
571     #ifdef PNG_SETJMP_SUPPORTED
572     /* Applications that neglect to set up their own setjmp() and then encounter
573     a png_error() will longjmp here. Since the jmpbuf is then meaningless we
574     abort instead of returning. */
575     #ifdef USE_FAR_KEYWORD
576     if (setjmp(jmpbuf))
577     PNG_ABORT();
578     png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
579     #else
580     if (setjmp(png_ptr->jmpbuf))
581     PNG_ABORT();
582     #endif
583     #endif
584     return (png_ptr);
585     }
586    
587     /* Initialize png_ptr structure, and allocate any memory needed */
588     #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
589     /* Deprecated. */
590     #undef png_write_init
591     void PNGAPI
592     png_write_init(png_structp png_ptr)
593     {
594     /* We only come here via pre-1.0.7-compiled applications */
595     png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
596     }
597    
598     void PNGAPI
599     png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
600     png_size_t png_struct_size, png_size_t png_info_size)
601     {
602     /* We only come here via pre-1.0.12-compiled applications */
603     if (png_ptr == NULL) return;
604     #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
605     if (png_sizeof(png_struct) > png_struct_size ||
606     png_sizeof(png_info) > png_info_size)
607     {
608     char msg[80];
609     png_ptr->warning_fn=NULL;
610     if (user_png_ver)
611     {
612     png_snprintf(msg, 80,
613     "Application was compiled with png.h from libpng-%.20s",
614     user_png_ver);
615     png_warning(png_ptr, msg);
616     }
617     png_snprintf(msg, 80,
618     "Application is running with png.c from libpng-%.20s",
619     png_libpng_ver);
620     png_warning(png_ptr, msg);
621     }
622     #endif
623     if (png_sizeof(png_struct) > png_struct_size)
624     {
625     png_ptr->error_fn=NULL;
626     #ifdef PNG_ERROR_NUMBERS_SUPPORTED
627     png_ptr->flags=0;
628     #endif
629     png_error(png_ptr,
630     "The png struct allocated by the application for writing is too small.");
631     }
632     if (png_sizeof(png_info) > png_info_size)
633     {
634     png_ptr->error_fn=NULL;
635     #ifdef PNG_ERROR_NUMBERS_SUPPORTED
636     png_ptr->flags=0;
637     #endif
638     png_error(png_ptr,
639     "The info struct allocated by the application for writing is too small.");
640     }
641     png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
642     }
643     #endif /* PNG_1_0_X || PNG_1_2_X */
644    
645    
646     void PNGAPI
647     png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
648     png_size_t png_struct_size)
649     {
650     png_structp png_ptr=*ptr_ptr;
651     #ifdef PNG_SETJMP_SUPPORTED
652     jmp_buf tmp_jmp; /* To save current jump buffer */
653     #endif
654    
655     int i = 0;
656    
657     if (png_ptr == NULL)
658     return;
659    
660     do
661     {
662     if (user_png_ver[i] != png_libpng_ver[i])
663     {
664     #ifdef PNG_LEGACY_SUPPORTED
665     png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
666     #else
667     png_ptr->warning_fn=NULL;
668     png_warning(png_ptr,
669     "Application uses deprecated png_write_init() and should be recompiled.");
670     break;
671     #endif
672     }
673     } while (png_libpng_ver[i++]);
674    
675     png_debug(1, "in png_write_init_3");
676    
677     #ifdef PNG_SETJMP_SUPPORTED
678     /* Save jump buffer and error functions */
679     png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
680     #endif
681    
682     if (png_sizeof(png_struct) > png_struct_size)
683     {
684     png_destroy_struct(png_ptr);
685     png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
686     *ptr_ptr = png_ptr;
687     }
688    
689     /* Reset all variables to 0 */
690     png_memset(png_ptr, 0, png_sizeof(png_struct));
691    
692     /* Added at libpng-1.2.6 */
693     #ifdef PNG_SET_USER_LIMITS_SUPPORTED
694     png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
695     png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
696     #endif
697    
698     #ifdef PNG_SETJMP_SUPPORTED
699     /* Restore jump buffer */
700     png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
701     #endif
702    
703     png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
704     png_flush_ptr_NULL);
705    
706     /* Initialize zbuf - compression buffer */
707     png_ptr->zbuf_size = PNG_ZBUF_SIZE;
708     png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
709     (png_uint_32)png_ptr->zbuf_size);
710    
711     #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
712     png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
713     1, png_doublep_NULL, png_doublep_NULL);
714     #endif
715     }
716    
717     /* Write a few rows of image data. If the image is interlaced,
718     * either you will have to write the 7 sub images, or, if you
719     * have called png_set_interlace_handling(), you will have to
720     * "write" the image seven times.
721     */
722     void PNGAPI
723     png_write_rows(png_structp png_ptr, png_bytepp row,
724     png_uint_32 num_rows)
725     {
726     png_uint_32 i; /* Row counter */
727     png_bytepp rp; /* Row pointer */
728    
729     png_debug(1, "in png_write_rows");
730    
731     if (png_ptr == NULL)
732     return;
733    
734     /* Loop through the rows */
735     for (i = 0, rp = row; i < num_rows; i++, rp++)
736     {
737     png_write_row(png_ptr, *rp);
738     }
739     }
740    
741     /* Write the image. You only need to call this function once, even
742     * if you are writing an interlaced image.
743     */
744     void PNGAPI
745     png_write_image(png_structp png_ptr, png_bytepp image)
746     {
747     png_uint_32 i; /* Row index */
748     int pass, num_pass; /* Pass variables */
749     png_bytepp rp; /* Points to current row */
750    
751     if (png_ptr == NULL)
752     return;
753    
754     png_debug(1, "in png_write_image");
755     #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
756     /* Initialize interlace handling. If image is not interlaced,
757     * this will set pass to 1
758     */
759     num_pass = png_set_interlace_handling(png_ptr);
760     #else
761     num_pass = 1;
762     #endif
763     /* Loop through passes */
764     for (pass = 0; pass < num_pass; pass++)
765     {
766     /* Loop through image */
767     for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
768     {
769     png_write_row(png_ptr, *rp);
770     }
771     }
772     }
773    
774     /* Called by user to write a row of image data */
775     void PNGAPI
776     png_write_row(png_structp png_ptr, png_bytep row)
777     {
778     if (png_ptr == NULL)
779     return;
780     png_debug2(1, "in png_write_row (row %ld, pass %d)",
781     png_ptr->row_number, png_ptr->pass);
782    
783     /* Initialize transformations and other stuff if first time */
784     if (png_ptr->row_number == 0 && png_ptr->pass == 0)
785     {
786     /* Make sure we wrote the header info */
787     if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
788     png_error(png_ptr,
789     "png_write_info was never called before png_write_row.");
790    
791     /* Check for transforms that have been set but were defined out */
792     #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
793     if (png_ptr->transformations & PNG_INVERT_MONO)
794     png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
795     #endif
796     #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
797     if (png_ptr->transformations & PNG_FILLER)
798     png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
799     #endif
800     #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
801     if (png_ptr->transformations & PNG_PACKSWAP)
802     png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
803     #endif
804     #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
805     if (png_ptr->transformations & PNG_PACK)
806     png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
807     #endif
808     #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
809     if (png_ptr->transformations & PNG_SHIFT)
810     png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
811     #endif
812     #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
813     if (png_ptr->transformations & PNG_BGR)
814     png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
815     #endif
816     #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
817     if (png_ptr->transformations & PNG_SWAP_BYTES)
818     png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
819     #endif
820    
821     png_write_start_row(png_ptr);
822     }
823    
824     #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
825     /* If interlaced and not interested in row, return */
826     if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
827     {
828     switch (png_ptr->pass)
829     {
830     case 0:
831     if (png_ptr->row_number & 0x07)
832     {
833     png_write_finish_row(png_ptr);
834     return;
835     }
836     break;
837     case 1:
838     if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
839     {
840     png_write_finish_row(png_ptr);
841     return;
842     }
843     break;
844     case 2:
845     if ((png_ptr->row_number & 0x07) != 4)
846     {
847     png_write_finish_row(png_ptr);
848     return;
849     }
850     break;
851     case 3:
852     if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
853     {
854     png_write_finish_row(png_ptr);
855     return;
856     }
857     break;
858     case 4:
859     if ((png_ptr->row_number & 0x03) != 2)
860     {
861     png_write_finish_row(png_ptr);
862     return;
863     }
864     break;
865     case 5:
866     if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
867     {
868     png_write_finish_row(png_ptr);
869     return;
870     }
871     break;
872     case 6:
873     if (!(png_ptr->row_number & 0x01))
874     {
875     png_write_finish_row(png_ptr);
876     return;
877     }
878     break;
879     }
880     }
881     #endif
882    
883     /* Set up row info for transformations */
884     png_ptr->row_info.color_type = png_ptr->color_type;
885     png_ptr->row_info.width = png_ptr->usr_width;
886     png_ptr->row_info.channels = png_ptr->usr_channels;
887     png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
888     png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
889     png_ptr->row_info.channels);
890    
891     png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
892     png_ptr->row_info.width);
893    
894     png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
895     png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
896     png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
897     png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
898     png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
899     png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
900    
901     /* Copy user's row into buffer, leaving room for filter byte. */
902     png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
903     png_ptr->row_info.rowbytes);
904    
905     #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
906     /* Handle interlacing */
907     if (png_ptr->interlaced && png_ptr->pass < 6 &&
908     (png_ptr->transformations & PNG_INTERLACE))
909     {
910     png_do_write_interlace(&(png_ptr->row_info),
911     png_ptr->row_buf + 1, png_ptr->pass);
912     /* This should always get caught above, but still ... */
913     if (!(png_ptr->row_info.width))
914     {
915     png_write_finish_row(png_ptr);
916     return;
917     }
918     }
919     #endif
920    
921     /* Handle other transformations */
922     if (png_ptr->transformations)
923     png_do_write_transformations(png_ptr);
924    
925     #if defined(PNG_MNG_FEATURES_SUPPORTED)
926     /* Write filter_method 64 (intrapixel differencing) only if
927     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
928     * 2. Libpng did not write a PNG signature (this filter_method is only
929     * used in PNG datastreams that are embedded in MNG datastreams) and
930     * 3. The application called png_permit_mng_features with a mask that
931     * included PNG_FLAG_MNG_FILTER_64 and
932     * 4. The filter_method is 64 and
933     * 5. The color_type is RGB or RGBA
934     */
935     if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
936     (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
937     {
938     /* Intrapixel differencing */
939     png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
940     }
941     #endif
942    
943     /* Find a filter if necessary, filter the row and write it out. */
944     png_write_find_filter(png_ptr, &(png_ptr->row_info));
945    
946     if (png_ptr->write_row_fn != NULL)
947     (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
948     }
949    
950     #if defined(PNG_WRITE_FLUSH_SUPPORTED)
951     /* Set the automatic flush interval or 0 to turn flushing off */
952     void PNGAPI
953     png_set_flush(png_structp png_ptr, int nrows)
954     {
955     png_debug(1, "in png_set_flush");
956     if (png_ptr == NULL)
957     return;
958     png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
959     }
960    
961     /* Flush the current output buffers now */
962     void PNGAPI
963     png_write_flush(png_structp png_ptr)
964     {
965     int wrote_IDAT;
966    
967     png_debug(1, "in png_write_flush");
968     if (png_ptr == NULL)
969     return;
970     /* We have already written out all of the data */
971     if (png_ptr->row_number >= png_ptr->num_rows)
972     return;
973    
974     do
975     {
976     int ret;
977    
978     /* Compress the data */
979     ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
980     wrote_IDAT = 0;
981    
982     /* Check for compression errors */
983     if (ret != Z_OK)
984     {
985     if (png_ptr->zstream.msg != NULL)
986     png_error(png_ptr, png_ptr->zstream.msg);
987     else
988     png_error(png_ptr, "zlib error");
989     }
990    
991     if (!(png_ptr->zstream.avail_out))
992     {
993     /* Write the IDAT and reset the zlib output buffer */
994     png_write_IDAT(png_ptr, png_ptr->zbuf,
995     png_ptr->zbuf_size);
996     png_ptr->zstream.next_out = png_ptr->zbuf;
997     png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
998     wrote_IDAT = 1;
999     }
1000     } while(wrote_IDAT == 1);
1001    
1002     /* If there is any data left to be output, write it into a new IDAT */
1003     if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
1004     {
1005     /* Write the IDAT and reset the zlib output buffer */
1006     png_write_IDAT(png_ptr, png_ptr->zbuf,
1007     png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1008     png_ptr->zstream.next_out = png_ptr->zbuf;
1009     png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1010     }
1011     png_ptr->flush_rows = 0;
1012     png_flush(png_ptr);
1013     }
1014     #endif /* PNG_WRITE_FLUSH_SUPPORTED */
1015    
1016     /* Free all memory used by the write */
1017     void PNGAPI
1018     png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
1019     {
1020     png_structp png_ptr = NULL;
1021     png_infop info_ptr = NULL;
1022     #ifdef PNG_USER_MEM_SUPPORTED
1023     png_free_ptr free_fn = NULL;
1024     png_voidp mem_ptr = NULL;
1025     #endif
1026    
1027     png_debug(1, "in png_destroy_write_struct");
1028     if (png_ptr_ptr != NULL)
1029     {
1030     png_ptr = *png_ptr_ptr;
1031     #ifdef PNG_USER_MEM_SUPPORTED
1032     free_fn = png_ptr->free_fn;
1033     mem_ptr = png_ptr->mem_ptr;
1034     #endif
1035     }
1036    
1037     #ifdef PNG_USER_MEM_SUPPORTED
1038     if (png_ptr != NULL)
1039     {
1040     free_fn = png_ptr->free_fn;
1041     mem_ptr = png_ptr->mem_ptr;
1042     }
1043     #endif
1044    
1045     if (info_ptr_ptr != NULL)
1046     info_ptr = *info_ptr_ptr;
1047    
1048     if (info_ptr != NULL)
1049     {
1050     if (png_ptr != NULL)
1051     {
1052     png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
1053    
1054     #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1055     if (png_ptr->num_chunk_list)
1056     {
1057     png_free(png_ptr, png_ptr->chunk_list);
1058     png_ptr->chunk_list=NULL;
1059     png_ptr->num_chunk_list = 0;
1060     }
1061     #endif
1062     }
1063    
1064     #ifdef PNG_USER_MEM_SUPPORTED
1065     png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
1066     (png_voidp)mem_ptr);
1067     #else
1068     png_destroy_struct((png_voidp)info_ptr);
1069     #endif
1070     *info_ptr_ptr = NULL;
1071     }
1072    
1073     if (png_ptr != NULL)
1074     {
1075     png_write_destroy(png_ptr);
1076     #ifdef PNG_USER_MEM_SUPPORTED
1077     png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
1078     (png_voidp)mem_ptr);
1079     #else
1080     png_destroy_struct((png_voidp)png_ptr);
1081     #endif
1082     *png_ptr_ptr = NULL;
1083     }
1084     }
1085    
1086    
1087     /* Free any memory used in png_ptr struct (old method) */
1088     void /* PRIVATE */
1089     png_write_destroy(png_structp png_ptr)
1090     {
1091     #ifdef PNG_SETJMP_SUPPORTED
1092     jmp_buf tmp_jmp; /* Save jump buffer */
1093     #endif
1094     png_error_ptr error_fn;
1095     png_error_ptr warning_fn;
1096     png_voidp error_ptr;
1097     #ifdef PNG_USER_MEM_SUPPORTED
1098     png_free_ptr free_fn;
1099     #endif
1100    
1101     png_debug(1, "in png_write_destroy");
1102     /* Free any memory zlib uses */
1103     deflateEnd(&png_ptr->zstream);
1104    
1105     /* Free our memory. png_free checks NULL for us. */
1106     png_free(png_ptr, png_ptr->zbuf);
1107     png_free(png_ptr, png_ptr->row_buf);
1108     #ifndef PNG_NO_WRITE_FILTER
1109     png_free(png_ptr, png_ptr->prev_row);
1110     png_free(png_ptr, png_ptr->sub_row);
1111     png_free(png_ptr, png_ptr->up_row);
1112     png_free(png_ptr, png_ptr->avg_row);
1113     png_free(png_ptr, png_ptr->paeth_row);
1114     #endif
1115    
1116     #if defined(PNG_TIME_RFC1123_SUPPORTED)
1117     png_free(png_ptr, png_ptr->time_buffer);
1118     #endif
1119    
1120     #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1121     png_free(png_ptr, png_ptr->prev_filters);
1122     png_free(png_ptr, png_ptr->filter_weights);
1123     png_free(png_ptr, png_ptr->inv_filter_weights);
1124     png_free(png_ptr, png_ptr->filter_costs);
1125     png_free(png_ptr, png_ptr->inv_filter_costs);
1126     #endif
1127    
1128     #ifdef PNG_SETJMP_SUPPORTED
1129     /* Reset structure */
1130     png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
1131     #endif
1132    
1133     error_fn = png_ptr->error_fn;
1134     warning_fn = png_ptr->warning_fn;
1135     error_ptr = png_ptr->error_ptr;
1136     #ifdef PNG_USER_MEM_SUPPORTED
1137     free_fn = png_ptr->free_fn;
1138     #endif
1139    
1140     png_memset(png_ptr, 0, png_sizeof(png_struct));
1141    
1142     png_ptr->error_fn = error_fn;
1143     png_ptr->warning_fn = warning_fn;
1144     png_ptr->error_ptr = error_ptr;
1145     #ifdef PNG_USER_MEM_SUPPORTED
1146     png_ptr->free_fn = free_fn;
1147     #endif
1148    
1149     #ifdef PNG_SETJMP_SUPPORTED
1150     png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1151     #endif
1152     }
1153    
1154     /* Allow the application to select one or more row filters to use. */
1155     void PNGAPI
1156     png_set_filter(png_structp png_ptr, int method, int filters)
1157     {
1158     png_debug(1, "in png_set_filter");
1159     if (png_ptr == NULL)
1160     return;
1161     #if defined(PNG_MNG_FEATURES_SUPPORTED)
1162     if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
1163     (method == PNG_INTRAPIXEL_DIFFERENCING))
1164     method = PNG_FILTER_TYPE_BASE;
1165     #endif
1166     if (method == PNG_FILTER_TYPE_BASE)
1167     {
1168     switch (filters & (PNG_ALL_FILTERS | 0x07))
1169     {
1170     #ifndef PNG_NO_WRITE_FILTER
1171     case 5:
1172     case 6:
1173     case 7: png_warning(png_ptr, "Unknown row filter for method 0");
1174     #endif /* PNG_NO_WRITE_FILTER */
1175     case PNG_FILTER_VALUE_NONE:
1176     png_ptr->do_filter=PNG_FILTER_NONE; break;
1177     #ifndef PNG_NO_WRITE_FILTER
1178     case PNG_FILTER_VALUE_SUB:
1179     png_ptr->do_filter=PNG_FILTER_SUB; break;
1180     case PNG_FILTER_VALUE_UP:
1181     png_ptr->do_filter=PNG_FILTER_UP; break;
1182     case PNG_FILTER_VALUE_AVG:
1183     png_ptr->do_filter=PNG_FILTER_AVG; break;
1184     case PNG_FILTER_VALUE_PAETH:
1185     png_ptr->do_filter=PNG_FILTER_PAETH; break;
1186     default: png_ptr->do_filter = (png_byte)filters; break;
1187     #else
1188     default: png_warning(png_ptr, "Unknown row filter for method 0");
1189     #endif /* PNG_NO_WRITE_FILTER */
1190     }
1191    
1192     /* If we have allocated the row_buf, this means we have already started
1193     * with the image and we should have allocated all of the filter buffers
1194     * that have been selected. If prev_row isn't already allocated, then
1195     * it is too late to start using the filters that need it, since we
1196     * will be missing the data in the previous row. If an application
1197     * wants to start and stop using particular filters during compression,
1198     * it should start out with all of the filters, and then add and
1199     * remove them after the start of compression.
1200     */
1201     if (png_ptr->row_buf != NULL)
1202     {
1203     #ifndef PNG_NO_WRITE_FILTER
1204     if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
1205     {
1206     png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
1207     (png_ptr->rowbytes + 1));
1208     png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
1209     }
1210    
1211     if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
1212     {
1213     if (png_ptr->prev_row == NULL)
1214     {
1215     png_warning(png_ptr, "Can't add Up filter after starting");
1216     png_ptr->do_filter &= ~PNG_FILTER_UP;
1217     }
1218     else
1219     {
1220     png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
1221     (png_ptr->rowbytes + 1));
1222     png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
1223     }
1224     }
1225    
1226     if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
1227     {
1228     if (png_ptr->prev_row == NULL)
1229     {
1230     png_warning(png_ptr, "Can't add Average filter after starting");
1231     png_ptr->do_filter &= ~PNG_FILTER_AVG;
1232     }
1233     else
1234     {
1235     png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
1236     (png_ptr->rowbytes + 1));
1237     png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
1238     }
1239     }
1240    
1241     if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
1242     png_ptr->paeth_row == NULL)
1243     {
1244     if (png_ptr->prev_row == NULL)
1245     {
1246     png_warning(png_ptr, "Can't add Paeth filter after starting");
1247     png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
1248     }
1249     else
1250     {
1251     png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
1252     (png_ptr->rowbytes + 1));
1253     png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
1254     }
1255     }
1256    
1257     if (png_ptr->do_filter == PNG_NO_FILTERS)
1258     #endif /* PNG_NO_WRITE_FILTER */
1259     png_ptr->do_filter = PNG_FILTER_NONE;
1260     }
1261     }
1262     else
1263     png_error(png_ptr, "Unknown custom filter method");
1264     }
1265    
1266     /* This allows us to influence the way in which libpng chooses the "best"
1267     * filter for the current scanline. While the "minimum-sum-of-absolute-
1268     * differences metric is relatively fast and effective, there is some
1269     * question as to whether it can be improved upon by trying to keep the
1270     * filtered data going to zlib more consistent, hopefully resulting in
1271     * better compression.
1272     */
1273     #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
1274     void PNGAPI
1275     png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
1276     int num_weights, png_doublep filter_weights,
1277     png_doublep filter_costs)
1278     {
1279     int i;
1280    
1281     png_debug(1, "in png_set_filter_heuristics");
1282     if (png_ptr == NULL)
1283     return;
1284     if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
1285     {
1286     png_warning(png_ptr, "Unknown filter heuristic method");
1287     return;
1288     }
1289    
1290     if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
1291     {
1292     heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
1293     }
1294    
1295     if (num_weights < 0 || filter_weights == NULL ||
1296     heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
1297     {
1298     num_weights = 0;
1299     }
1300    
1301     png_ptr->num_prev_filters = (png_byte)num_weights;
1302     png_ptr->heuristic_method = (png_byte)heuristic_method;
1303    
1304     if (num_weights > 0)
1305     {
1306     if (png_ptr->prev_filters == NULL)
1307     {
1308     png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
1309     (png_uint_32)(png_sizeof(png_byte) * num_weights));
1310    
1311     /* To make sure that the weighting starts out fairly */
1312     for (i = 0; i < num_weights; i++)
1313     {
1314     png_ptr->prev_filters[i] = 255;
1315     }
1316     }
1317    
1318     if (png_ptr->filter_weights == NULL)
1319     {
1320     png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
1321     (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1322    
1323     png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
1324     (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
1325     for (i = 0; i < num_weights; i++)
1326     {
1327     png_ptr->inv_filter_weights[i] =
1328     png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1329     }
1330     }
1331    
1332     for (i = 0; i < num_weights; i++)
1333     {
1334     if (filter_weights[i] < 0.0)
1335     {
1336     png_ptr->inv_filter_weights[i] =
1337     png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
1338     }
1339     else
1340     {
1341     png_ptr->inv_filter_weights[i] =
1342     (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
1343     png_ptr->filter_weights[i] =
1344     (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
1345     }
1346     }
1347     }
1348    
1349     /* If, in the future, there are other filter methods, this would
1350     * need to be based on png_ptr->filter.
1351     */
1352     if (png_ptr->filter_costs == NULL)
1353     {
1354     png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
1355     (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1356    
1357     png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
1358     (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1359    
1360     for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1361     {
1362     png_ptr->inv_filter_costs[i] =
1363     png_ptr->filter_costs[i] = PNG_COST_FACTOR;
1364     }
1365     }
1366    
1367     /* Here is where we set the relative costs of the different filters. We
1368     * should take the desired compression level into account when setting
1369     * the costs, so that Paeth, for instance, has a high relative cost at low
1370     * compression levels, while it has a lower relative cost at higher
1371     * compression settings. The filter types are in order of increasing
1372     * relative cost, so it would be possible to do this with an algorithm.
1373     */
1374     for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
1375     {
1376     if (filter_costs == NULL || filter_costs[i] < 0.0)
1377     {
1378     png_ptr->inv_filter_costs[i] =
1379     png_ptr->filter_costs[i] = PNG_COST_FACTOR;
1380     }
1381     else if (filter_costs[i] >= 1.0)
1382     {
1383     png_ptr->inv_filter_costs[i] =
1384     (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
1385     png_ptr->filter_costs[i] =
1386     (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
1387     }
1388     }
1389     }
1390     #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1391    
1392     void PNGAPI
1393     png_set_compression_level(png_structp png_ptr, int level)
1394     {
1395     png_debug(1, "in png_set_compression_level");
1396     if (png_ptr == NULL)
1397     return;
1398     png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
1399     png_ptr->zlib_level = level;
1400     }
1401    
1402     void PNGAPI
1403     png_set_compression_mem_level(png_structp png_ptr, int mem_level)
1404     {
1405     png_debug(1, "in png_set_compression_mem_level");
1406     if (png_ptr == NULL)
1407     return;
1408     png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
1409     png_ptr->zlib_mem_level = mem_level;
1410     }
1411    
1412     void PNGAPI
1413     png_set_compression_strategy(png_structp png_ptr, int strategy)
1414     {
1415     png_debug(1, "in png_set_compression_strategy");
1416     if (png_ptr == NULL)
1417     return;
1418     png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
1419     png_ptr->zlib_strategy = strategy;
1420     }
1421    
1422     void PNGAPI
1423     png_set_compression_window_bits(png_structp png_ptr, int window_bits)
1424     {
1425     if (png_ptr == NULL)
1426     return;
1427     if (window_bits > 15)
1428     png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1429     else if (window_bits < 8)
1430     png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1431     #ifndef WBITS_8_OK
1432     /* Avoid libpng bug with 256-byte windows */
1433     if (window_bits == 8)
1434     {
1435     png_warning(png_ptr, "Compression window is being reset to 512");
1436     window_bits=9;
1437     }
1438     #endif
1439     png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
1440     png_ptr->zlib_window_bits = window_bits;
1441     }
1442    
1443     void PNGAPI
1444     png_set_compression_method(png_structp png_ptr, int method)
1445     {
1446     png_debug(1, "in png_set_compression_method");
1447     if (png_ptr == NULL)
1448     return;
1449     if (method != 8)
1450     png_warning(png_ptr, "Only compression method 8 is supported by PNG");
1451     png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
1452     png_ptr->zlib_method = method;
1453     }
1454    
1455     void PNGAPI
1456     png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
1457     {
1458     if (png_ptr == NULL)
1459     return;
1460     png_ptr->write_row_fn = write_row_fn;
1461     }
1462    
1463     #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1464     void PNGAPI
1465     png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
1466     write_user_transform_fn)
1467     {
1468     png_debug(1, "in png_set_write_user_transform_fn");
1469     if (png_ptr == NULL)
1470     return;
1471     png_ptr->transformations |= PNG_USER_TRANSFORM;
1472     png_ptr->write_user_transform_fn = write_user_transform_fn;
1473     }
1474     #endif
1475    
1476    
1477     #if defined(PNG_INFO_IMAGE_SUPPORTED)
1478     void PNGAPI
1479     png_write_png(png_structp png_ptr, png_infop info_ptr,
1480     int transforms, voidp params)
1481     {
1482     if (png_ptr == NULL || info_ptr == NULL)
1483     return;
1484     #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1485     /* Invert the alpha channel from opacity to transparency */
1486     if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1487     png_set_invert_alpha(png_ptr);
1488     #endif
1489    
1490     /* Write the file header information. */
1491     png_write_info(png_ptr, info_ptr);
1492    
1493     /* ------ these transformations don't touch the info structure ------- */
1494    
1495     #if defined(PNG_WRITE_INVERT_SUPPORTED)
1496     /* Invert monochrome pixels */
1497     if (transforms & PNG_TRANSFORM_INVERT_MONO)
1498     png_set_invert_mono(png_ptr);
1499     #endif
1500    
1501     #if defined(PNG_WRITE_SHIFT_SUPPORTED)
1502     /* Shift the pixels up to a legal bit depth and fill in
1503     * as appropriate to correctly scale the image.
1504     */
1505     if ((transforms & PNG_TRANSFORM_SHIFT)
1506     && (info_ptr->valid & PNG_INFO_sBIT))
1507     png_set_shift(png_ptr, &info_ptr->sig_bit);
1508     #endif
1509    
1510     #if defined(PNG_WRITE_PACK_SUPPORTED)
1511     /* Pack pixels into bytes */
1512     if (transforms & PNG_TRANSFORM_PACKING)
1513     png_set_packing(png_ptr);
1514     #endif
1515    
1516     #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1517     /* Swap location of alpha bytes from ARGB to RGBA */
1518     if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1519     png_set_swap_alpha(png_ptr);
1520     #endif
1521    
1522     #if defined(PNG_WRITE_FILLER_SUPPORTED)
1523     /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
1524     if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
1525     png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
1526     else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
1527     png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
1528     #endif
1529    
1530     #if defined(PNG_WRITE_BGR_SUPPORTED)
1531     /* Flip BGR pixels to RGB */
1532     if (transforms & PNG_TRANSFORM_BGR)
1533     png_set_bgr(png_ptr);
1534     #endif
1535    
1536     #if defined(PNG_WRITE_SWAP_SUPPORTED)
1537     /* Swap bytes of 16-bit files to most significant byte first */
1538     if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1539     png_set_swap(png_ptr);
1540     #endif
1541    
1542     #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1543     /* Swap bits of 1, 2, 4 bit packed pixel formats */
1544     if (transforms & PNG_TRANSFORM_PACKSWAP)
1545     png_set_packswap(png_ptr);
1546     #endif
1547    
1548     /* ----------------------- end of transformations ------------------- */
1549    
1550     /* Write the bits */
1551     if (info_ptr->valid & PNG_INFO_IDAT)
1552     png_write_image(png_ptr, info_ptr->row_pointers);
1553    
1554     /* It is REQUIRED to call this to finish writing the rest of the file */
1555     png_write_end(png_ptr, info_ptr);
1556    
1557     transforms = transforms; /* Quiet compiler warnings */
1558     params = params;
1559     }
1560     #endif
1561     #endif /* PNG_WRITE_SUPPORTED */

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