diff options
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwrite.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwrite.c | 1655 |
1 files changed, 0 insertions, 1655 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwrite.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwrite.c deleted file mode 100644 index 6d3fd4c..0000000 --- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwrite.c +++ /dev/null | |||
@@ -1,1655 +0,0 @@ | |||
1 | |||
2 | /* pngwrite.c - general routines to write a PNG file | ||
3 | * | ||
4 | * Last changed in libpng 1.5.7 [December 15, 2011] | ||
5 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson | ||
6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | ||
7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | ||
8 | * | ||
9 | * This code is released under the libpng license. | ||
10 | * For conditions of distribution and use, see the disclaimer | ||
11 | * and license in png.h | ||
12 | */ | ||
13 | |||
14 | #include "pngpriv.h" | ||
15 | |||
16 | #ifdef PNG_WRITE_SUPPORTED | ||
17 | |||
18 | /* Writes all the PNG information. This is the suggested way to use the | ||
19 | * library. If you have a new chunk to add, make a function to write it, | ||
20 | * and put it in the correct location here. If you want the chunk written | ||
21 | * after the image data, put it in png_write_end(). I strongly encourage | ||
22 | * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing | ||
23 | * the chunk, as that will keep the code from breaking if you want to just | ||
24 | * write a plain PNG file. If you have long comments, I suggest writing | ||
25 | * them in png_write_end(), and compressing them. | ||
26 | */ | ||
27 | void PNGAPI | ||
28 | png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) | ||
29 | { | ||
30 | png_debug(1, "in png_write_info_before_PLTE"); | ||
31 | |||
32 | if (png_ptr == NULL || info_ptr == NULL) | ||
33 | return; | ||
34 | |||
35 | if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) | ||
36 | { | ||
37 | /* Write PNG signature */ | ||
38 | png_write_sig(png_ptr); | ||
39 | |||
40 | #ifdef PNG_MNG_FEATURES_SUPPORTED | ||
41 | if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ | ||
42 | (png_ptr->mng_features_permitted)) | ||
43 | { | ||
44 | png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); | ||
45 | png_ptr->mng_features_permitted = 0; | ||
46 | } | ||
47 | #endif | ||
48 | |||
49 | /* Write IHDR information. */ | ||
50 | png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, | ||
51 | info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, | ||
52 | info_ptr->filter_type, | ||
53 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED | ||
54 | info_ptr->interlace_type); | ||
55 | #else | ||
56 | 0); | ||
57 | #endif | ||
58 | /* The rest of these check to see if the valid field has the appropriate | ||
59 | * flag set, and if it does, writes the chunk. | ||
60 | */ | ||
61 | #ifdef PNG_WRITE_gAMA_SUPPORTED | ||
62 | if (info_ptr->valid & PNG_INFO_gAMA) | ||
63 | png_write_gAMA_fixed(png_ptr, info_ptr->gamma); | ||
64 | #endif | ||
65 | #ifdef PNG_WRITE_sRGB_SUPPORTED | ||
66 | if (info_ptr->valid & PNG_INFO_sRGB) | ||
67 | png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); | ||
68 | #endif | ||
69 | |||
70 | #ifdef PNG_WRITE_iCCP_SUPPORTED | ||
71 | if (info_ptr->valid & PNG_INFO_iCCP) | ||
72 | png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, | ||
73 | (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); | ||
74 | #endif | ||
75 | #ifdef PNG_WRITE_sBIT_SUPPORTED | ||
76 | if (info_ptr->valid & PNG_INFO_sBIT) | ||
77 | png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); | ||
78 | #endif | ||
79 | #ifdef PNG_WRITE_cHRM_SUPPORTED | ||
80 | if (info_ptr->valid & PNG_INFO_cHRM) | ||
81 | png_write_cHRM_fixed(png_ptr, | ||
82 | info_ptr->x_white, info_ptr->y_white, | ||
83 | info_ptr->x_red, info_ptr->y_red, | ||
84 | info_ptr->x_green, info_ptr->y_green, | ||
85 | info_ptr->x_blue, info_ptr->y_blue); | ||
86 | #endif | ||
87 | |||
88 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED | ||
89 | if (info_ptr->unknown_chunks_num) | ||
90 | { | ||
91 | png_unknown_chunk *up; | ||
92 | |||
93 | png_debug(5, "writing extra chunks"); | ||
94 | |||
95 | for (up = info_ptr->unknown_chunks; | ||
96 | up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; | ||
97 | up++) | ||
98 | { | ||
99 | int keep = png_handle_as_unknown(png_ptr, up->name); | ||
100 | |||
101 | if (keep != PNG_HANDLE_CHUNK_NEVER && | ||
102 | up->location && | ||
103 | !(up->location & PNG_HAVE_PLTE) && | ||
104 | !(up->location & PNG_HAVE_IDAT) && | ||
105 | !(up->location & PNG_AFTER_IDAT) && | ||
106 | ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || | ||
107 | (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) | ||
108 | { | ||
109 | if (up->size == 0) | ||
110 | png_warning(png_ptr, "Writing zero-length unknown chunk"); | ||
111 | |||
112 | png_write_chunk(png_ptr, up->name, up->data, up->size); | ||
113 | } | ||
114 | } | ||
115 | } | ||
116 | #endif | ||
117 | png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; | ||
118 | } | ||
119 | } | ||
120 | |||
121 | void PNGAPI | ||
122 | png_write_info(png_structp png_ptr, png_infop info_ptr) | ||
123 | { | ||
124 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) | ||
125 | int i; | ||
126 | #endif | ||
127 | |||
128 | png_debug(1, "in png_write_info"); | ||
129 | |||
130 | if (png_ptr == NULL || info_ptr == NULL) | ||
131 | return; | ||
132 | |||
133 | png_write_info_before_PLTE(png_ptr, info_ptr); | ||
134 | |||
135 | if (info_ptr->valid & PNG_INFO_PLTE) | ||
136 | png_write_PLTE(png_ptr, info_ptr->palette, | ||
137 | (png_uint_32)info_ptr->num_palette); | ||
138 | |||
139 | else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | ||
140 | png_error(png_ptr, "Valid palette required for paletted images"); | ||
141 | |||
142 | #ifdef PNG_WRITE_tRNS_SUPPORTED | ||
143 | if (info_ptr->valid & PNG_INFO_tRNS) | ||
144 | { | ||
145 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED | ||
146 | /* Invert the alpha channel (in tRNS) */ | ||
147 | if ((png_ptr->transformations & PNG_INVERT_ALPHA) && | ||
148 | info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | ||
149 | { | ||
150 | int j; | ||
151 | for (j = 0; j<(int)info_ptr->num_trans; j++) | ||
152 | info_ptr->trans_alpha[j] = | ||
153 | (png_byte)(255 - info_ptr->trans_alpha[j]); | ||
154 | } | ||
155 | #endif | ||
156 | png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), | ||
157 | info_ptr->num_trans, info_ptr->color_type); | ||
158 | } | ||
159 | #endif | ||
160 | #ifdef PNG_WRITE_bKGD_SUPPORTED | ||
161 | if (info_ptr->valid & PNG_INFO_bKGD) | ||
162 | png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); | ||
163 | #endif | ||
164 | |||
165 | #ifdef PNG_WRITE_hIST_SUPPORTED | ||
166 | if (info_ptr->valid & PNG_INFO_hIST) | ||
167 | png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); | ||
168 | #endif | ||
169 | |||
170 | #ifdef PNG_WRITE_oFFs_SUPPORTED | ||
171 | if (info_ptr->valid & PNG_INFO_oFFs) | ||
172 | png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, | ||
173 | info_ptr->offset_unit_type); | ||
174 | #endif | ||
175 | |||
176 | #ifdef PNG_WRITE_pCAL_SUPPORTED | ||
177 | if (info_ptr->valid & PNG_INFO_pCAL) | ||
178 | png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, | ||
179 | info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, | ||
180 | info_ptr->pcal_units, info_ptr->pcal_params); | ||
181 | #endif | ||
182 | |||
183 | #ifdef PNG_WRITE_sCAL_SUPPORTED | ||
184 | if (info_ptr->valid & PNG_INFO_sCAL) | ||
185 | png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, | ||
186 | info_ptr->scal_s_width, info_ptr->scal_s_height); | ||
187 | #endif /* sCAL */ | ||
188 | |||
189 | #ifdef PNG_WRITE_pHYs_SUPPORTED | ||
190 | if (info_ptr->valid & PNG_INFO_pHYs) | ||
191 | png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, | ||
192 | info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); | ||
193 | #endif /* pHYs */ | ||
194 | |||
195 | #ifdef PNG_WRITE_tIME_SUPPORTED | ||
196 | if (info_ptr->valid & PNG_INFO_tIME) | ||
197 | { | ||
198 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); | ||
199 | png_ptr->mode |= PNG_WROTE_tIME; | ||
200 | } | ||
201 | #endif /* tIME */ | ||
202 | |||
203 | #ifdef PNG_WRITE_sPLT_SUPPORTED | ||
204 | if (info_ptr->valid & PNG_INFO_sPLT) | ||
205 | for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) | ||
206 | png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); | ||
207 | #endif /* sPLT */ | ||
208 | |||
209 | #ifdef PNG_WRITE_TEXT_SUPPORTED | ||
210 | /* Check to see if we need to write text chunks */ | ||
211 | for (i = 0; i < info_ptr->num_text; i++) | ||
212 | { | ||
213 | png_debug2(2, "Writing header text chunk %d, type %d", i, | ||
214 | info_ptr->text[i].compression); | ||
215 | /* An internationalized chunk? */ | ||
216 | if (info_ptr->text[i].compression > 0) | ||
217 | { | ||
218 | #ifdef PNG_WRITE_iTXt_SUPPORTED | ||
219 | /* Write international chunk */ | ||
220 | png_write_iTXt(png_ptr, | ||
221 | info_ptr->text[i].compression, | ||
222 | info_ptr->text[i].key, | ||
223 | info_ptr->text[i].lang, | ||
224 | info_ptr->text[i].lang_key, | ||
225 | info_ptr->text[i].text); | ||
226 | #else | ||
227 | png_warning(png_ptr, "Unable to write international text"); | ||
228 | #endif | ||
229 | /* Mark this chunk as written */ | ||
230 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; | ||
231 | } | ||
232 | |||
233 | /* If we want a compressed text chunk */ | ||
234 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) | ||
235 | { | ||
236 | #ifdef PNG_WRITE_zTXt_SUPPORTED | ||
237 | /* Write compressed chunk */ | ||
238 | png_write_zTXt(png_ptr, info_ptr->text[i].key, | ||
239 | info_ptr->text[i].text, 0, | ||
240 | info_ptr->text[i].compression); | ||
241 | #else | ||
242 | png_warning(png_ptr, "Unable to write compressed text"); | ||
243 | #endif | ||
244 | /* Mark this chunk as written */ | ||
245 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; | ||
246 | } | ||
247 | |||
248 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) | ||
249 | { | ||
250 | #ifdef PNG_WRITE_tEXt_SUPPORTED | ||
251 | /* Write uncompressed chunk */ | ||
252 | png_write_tEXt(png_ptr, info_ptr->text[i].key, | ||
253 | info_ptr->text[i].text, | ||
254 | 0); | ||
255 | /* Mark this chunk as written */ | ||
256 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; | ||
257 | #else | ||
258 | /* Can't get here */ | ||
259 | png_warning(png_ptr, "Unable to write uncompressed text"); | ||
260 | #endif | ||
261 | } | ||
262 | } | ||
263 | #endif /* tEXt */ | ||
264 | |||
265 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED | ||
266 | if (info_ptr->unknown_chunks_num) | ||
267 | { | ||
268 | png_unknown_chunk *up; | ||
269 | |||
270 | png_debug(5, "writing extra chunks"); | ||
271 | |||
272 | for (up = info_ptr->unknown_chunks; | ||
273 | up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; | ||
274 | up++) | ||
275 | { | ||
276 | int keep = png_handle_as_unknown(png_ptr, up->name); | ||
277 | if (keep != PNG_HANDLE_CHUNK_NEVER && | ||
278 | up->location && | ||
279 | (up->location & PNG_HAVE_PLTE) && | ||
280 | !(up->location & PNG_HAVE_IDAT) && | ||
281 | !(up->location & PNG_AFTER_IDAT) && | ||
282 | ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || | ||
283 | (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) | ||
284 | { | ||
285 | png_write_chunk(png_ptr, up->name, up->data, up->size); | ||
286 | } | ||
287 | } | ||
288 | } | ||
289 | #endif | ||
290 | } | ||
291 | |||
292 | /* Writes the end of the PNG file. If you don't want to write comments or | ||
293 | * time information, you can pass NULL for info. If you already wrote these | ||
294 | * in png_write_info(), do not write them again here. If you have long | ||
295 | * comments, I suggest writing them here, and compressing them. | ||
296 | */ | ||
297 | void PNGAPI | ||
298 | png_write_end(png_structp png_ptr, png_infop info_ptr) | ||
299 | { | ||
300 | png_debug(1, "in png_write_end"); | ||
301 | |||
302 | if (png_ptr == NULL) | ||
303 | return; | ||
304 | |||
305 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) | ||
306 | png_error(png_ptr, "No IDATs written into file"); | ||
307 | |||
308 | /* See if user wants us to write information chunks */ | ||
309 | if (info_ptr != NULL) | ||
310 | { | ||
311 | #ifdef PNG_WRITE_TEXT_SUPPORTED | ||
312 | int i; /* local index variable */ | ||
313 | #endif | ||
314 | #ifdef PNG_WRITE_tIME_SUPPORTED | ||
315 | /* Check to see if user has supplied a time chunk */ | ||
316 | if ((info_ptr->valid & PNG_INFO_tIME) && | ||
317 | !(png_ptr->mode & PNG_WROTE_tIME)) | ||
318 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); | ||
319 | |||
320 | #endif | ||
321 | #ifdef PNG_WRITE_TEXT_SUPPORTED | ||
322 | /* Loop through comment chunks */ | ||
323 | for (i = 0; i < info_ptr->num_text; i++) | ||
324 | { | ||
325 | png_debug2(2, "Writing trailer text chunk %d, type %d", i, | ||
326 | info_ptr->text[i].compression); | ||
327 | /* An internationalized chunk? */ | ||
328 | if (info_ptr->text[i].compression > 0) | ||
329 | { | ||
330 | #ifdef PNG_WRITE_iTXt_SUPPORTED | ||
331 | /* Write international chunk */ | ||
332 | png_write_iTXt(png_ptr, | ||
333 | info_ptr->text[i].compression, | ||
334 | info_ptr->text[i].key, | ||
335 | info_ptr->text[i].lang, | ||
336 | info_ptr->text[i].lang_key, | ||
337 | info_ptr->text[i].text); | ||
338 | #else | ||
339 | png_warning(png_ptr, "Unable to write international text"); | ||
340 | #endif | ||
341 | /* Mark this chunk as written */ | ||
342 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; | ||
343 | } | ||
344 | |||
345 | else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) | ||
346 | { | ||
347 | #ifdef PNG_WRITE_zTXt_SUPPORTED | ||
348 | /* Write compressed chunk */ | ||
349 | png_write_zTXt(png_ptr, info_ptr->text[i].key, | ||
350 | info_ptr->text[i].text, 0, | ||
351 | info_ptr->text[i].compression); | ||
352 | #else | ||
353 | png_warning(png_ptr, "Unable to write compressed text"); | ||
354 | #endif | ||
355 | /* Mark this chunk as written */ | ||
356 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; | ||
357 | } | ||
358 | |||
359 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) | ||
360 | { | ||
361 | #ifdef PNG_WRITE_tEXt_SUPPORTED | ||
362 | /* Write uncompressed chunk */ | ||
363 | png_write_tEXt(png_ptr, info_ptr->text[i].key, | ||
364 | info_ptr->text[i].text, 0); | ||
365 | #else | ||
366 | png_warning(png_ptr, "Unable to write uncompressed text"); | ||
367 | #endif | ||
368 | |||
369 | /* Mark this chunk as written */ | ||
370 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; | ||
371 | } | ||
372 | } | ||
373 | #endif | ||
374 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED | ||
375 | if (info_ptr->unknown_chunks_num) | ||
376 | { | ||
377 | png_unknown_chunk *up; | ||
378 | |||
379 | png_debug(5, "writing extra chunks"); | ||
380 | |||
381 | for (up = info_ptr->unknown_chunks; | ||
382 | up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; | ||
383 | up++) | ||
384 | { | ||
385 | int keep = png_handle_as_unknown(png_ptr, up->name); | ||
386 | if (keep != PNG_HANDLE_CHUNK_NEVER && | ||
387 | up->location && | ||
388 | (up->location & PNG_AFTER_IDAT) && | ||
389 | ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || | ||
390 | (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) | ||
391 | { | ||
392 | png_write_chunk(png_ptr, up->name, up->data, up->size); | ||
393 | } | ||
394 | } | ||
395 | } | ||
396 | #endif | ||
397 | } | ||
398 | |||
399 | png_ptr->mode |= PNG_AFTER_IDAT; | ||
400 | |||
401 | /* Write end of PNG file */ | ||
402 | png_write_IEND(png_ptr); | ||
403 | /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, | ||
404 | * and restored again in libpng-1.2.30, may cause some applications that | ||
405 | * do not set png_ptr->output_flush_fn to crash. If your application | ||
406 | * experiences a problem, please try building libpng with | ||
407 | * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to | ||
408 | * png-mng-implement at lists.sf.net . | ||
409 | */ | ||
410 | #ifdef PNG_WRITE_FLUSH_SUPPORTED | ||
411 | # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED | ||
412 | png_flush(png_ptr); | ||
413 | # endif | ||
414 | #endif | ||
415 | } | ||
416 | |||
417 | #ifdef PNG_CONVERT_tIME_SUPPORTED | ||
418 | /* "tm" structure is not supported on WindowsCE */ | ||
419 | void PNGAPI | ||
420 | png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime) | ||
421 | { | ||
422 | png_debug(1, "in png_convert_from_struct_tm"); | ||
423 | |||
424 | ptime->year = (png_uint_16)(1900 + ttime->tm_year); | ||
425 | ptime->month = (png_byte)(ttime->tm_mon + 1); | ||
426 | ptime->day = (png_byte)ttime->tm_mday; | ||
427 | ptime->hour = (png_byte)ttime->tm_hour; | ||
428 | ptime->minute = (png_byte)ttime->tm_min; | ||
429 | ptime->second = (png_byte)ttime->tm_sec; | ||
430 | } | ||
431 | |||
432 | void PNGAPI | ||
433 | png_convert_from_time_t(png_timep ptime, time_t ttime) | ||
434 | { | ||
435 | struct tm *tbuf; | ||
436 | |||
437 | png_debug(1, "in png_convert_from_time_t"); | ||
438 | |||
439 | tbuf = gmtime(&ttime); | ||
440 | png_convert_from_struct_tm(ptime, tbuf); | ||
441 | } | ||
442 | #endif | ||
443 | |||
444 | /* Initialize png_ptr structure, and allocate any memory needed */ | ||
445 | PNG_FUNCTION(png_structp,PNGAPI | ||
446 | png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, | ||
447 | png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) | ||
448 | { | ||
449 | #ifdef PNG_USER_MEM_SUPPORTED | ||
450 | return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, | ||
451 | warn_fn, NULL, NULL, NULL)); | ||
452 | } | ||
453 | |||
454 | /* Alternate initialize png_ptr structure, and allocate any memory needed */ | ||
455 | static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */ | ||
456 | |||
457 | PNG_FUNCTION(png_structp,PNGAPI | ||
458 | png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, | ||
459 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, | ||
460 | png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) | ||
461 | { | ||
462 | #endif /* PNG_USER_MEM_SUPPORTED */ | ||
463 | volatile int png_cleanup_needed = 0; | ||
464 | #ifdef PNG_SETJMP_SUPPORTED | ||
465 | volatile | ||
466 | #endif | ||
467 | png_structp png_ptr; | ||
468 | #ifdef PNG_SETJMP_SUPPORTED | ||
469 | #ifdef USE_FAR_KEYWORD | ||
470 | jmp_buf tmp_jmpbuf; | ||
471 | #endif | ||
472 | #endif | ||
473 | |||
474 | png_debug(1, "in png_create_write_struct"); | ||
475 | |||
476 | #ifdef PNG_USER_MEM_SUPPORTED | ||
477 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, | ||
478 | (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); | ||
479 | #else | ||
480 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); | ||
481 | #endif /* PNG_USER_MEM_SUPPORTED */ | ||
482 | if (png_ptr == NULL) | ||
483 | return (NULL); | ||
484 | |||
485 | /* Added at libpng-1.2.6 */ | ||
486 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED | ||
487 | png_ptr->user_width_max = PNG_USER_WIDTH_MAX; | ||
488 | png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; | ||
489 | #endif | ||
490 | |||
491 | #ifdef PNG_SETJMP_SUPPORTED | ||
492 | /* Applications that neglect to set up their own setjmp() and then | ||
493 | * encounter a png_error() will longjmp here. Since the jmpbuf is | ||
494 | * then meaningless we abort instead of returning. | ||
495 | */ | ||
496 | #ifdef USE_FAR_KEYWORD | ||
497 | if (setjmp(tmp_jmpbuf)) | ||
498 | #else | ||
499 | if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ | ||
500 | #endif | ||
501 | #ifdef USE_FAR_KEYWORD | ||
502 | png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); | ||
503 | #endif | ||
504 | PNG_ABORT(); | ||
505 | #endif | ||
506 | |||
507 | #ifdef PNG_USER_MEM_SUPPORTED | ||
508 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); | ||
509 | #endif /* PNG_USER_MEM_SUPPORTED */ | ||
510 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); | ||
511 | |||
512 | if (!png_user_version_check(png_ptr, user_png_ver)) | ||
513 | png_cleanup_needed = 1; | ||
514 | |||
515 | /* Initialize zbuf - compression buffer */ | ||
516 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; | ||
517 | |||
518 | if (!png_cleanup_needed) | ||
519 | { | ||
520 | png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, | ||
521 | png_ptr->zbuf_size); | ||
522 | if (png_ptr->zbuf == NULL) | ||
523 | png_cleanup_needed = 1; | ||
524 | } | ||
525 | |||
526 | if (png_cleanup_needed) | ||
527 | { | ||
528 | /* Clean up PNG structure and deallocate any memory. */ | ||
529 | png_free(png_ptr, png_ptr->zbuf); | ||
530 | png_ptr->zbuf = NULL; | ||
531 | #ifdef PNG_USER_MEM_SUPPORTED | ||
532 | png_destroy_struct_2((png_voidp)png_ptr, | ||
533 | (png_free_ptr)free_fn, (png_voidp)mem_ptr); | ||
534 | #else | ||
535 | png_destroy_struct((png_voidp)png_ptr); | ||
536 | #endif | ||
537 | return (NULL); | ||
538 | } | ||
539 | |||
540 | png_set_write_fn(png_ptr, NULL, NULL, NULL); | ||
541 | |||
542 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED | ||
543 | png_reset_filter_heuristics(png_ptr); | ||
544 | #endif | ||
545 | |||
546 | return (png_ptr); | ||
547 | } | ||
548 | |||
549 | |||
550 | /* Write a few rows of image data. If the image is interlaced, | ||
551 | * either you will have to write the 7 sub images, or, if you | ||
552 | * have called png_set_interlace_handling(), you will have to | ||
553 | * "write" the image seven times. | ||
554 | */ | ||
555 | void PNGAPI | ||
556 | png_write_rows(png_structp png_ptr, png_bytepp row, | ||
557 | png_uint_32 num_rows) | ||
558 | { | ||
559 | png_uint_32 i; /* row counter */ | ||
560 | png_bytepp rp; /* row pointer */ | ||
561 | |||
562 | png_debug(1, "in png_write_rows"); | ||
563 | |||
564 | if (png_ptr == NULL) | ||
565 | return; | ||
566 | |||
567 | /* Loop through the rows */ | ||
568 | for (i = 0, rp = row; i < num_rows; i++, rp++) | ||
569 | { | ||
570 | png_write_row(png_ptr, *rp); | ||
571 | } | ||
572 | } | ||
573 | |||
574 | /* Write the image. You only need to call this function once, even | ||
575 | * if you are writing an interlaced image. | ||
576 | */ | ||
577 | void PNGAPI | ||
578 | png_write_image(png_structp png_ptr, png_bytepp image) | ||
579 | { | ||
580 | png_uint_32 i; /* row index */ | ||
581 | int pass, num_pass; /* pass variables */ | ||
582 | png_bytepp rp; /* points to current row */ | ||
583 | |||
584 | if (png_ptr == NULL) | ||
585 | return; | ||
586 | |||
587 | png_debug(1, "in png_write_image"); | ||
588 | |||
589 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED | ||
590 | /* Initialize interlace handling. If image is not interlaced, | ||
591 | * this will set pass to 1 | ||
592 | */ | ||
593 | num_pass = png_set_interlace_handling(png_ptr); | ||
594 | #else | ||
595 | num_pass = 1; | ||
596 | #endif | ||
597 | /* Loop through passes */ | ||
598 | for (pass = 0; pass < num_pass; pass++) | ||
599 | { | ||
600 | /* Loop through image */ | ||
601 | for (i = 0, rp = image; i < png_ptr->height; i++, rp++) | ||
602 | { | ||
603 | png_write_row(png_ptr, *rp); | ||
604 | } | ||
605 | } | ||
606 | } | ||
607 | |||
608 | /* Called by user to write a row of image data */ | ||
609 | void PNGAPI | ||
610 | png_write_row(png_structp png_ptr, png_const_bytep row) | ||
611 | { | ||
612 | /* 1.5.6: moved from png_struct to be a local structure: */ | ||
613 | png_row_info row_info; | ||
614 | |||
615 | if (png_ptr == NULL) | ||
616 | return; | ||
617 | |||
618 | png_debug2(1, "in png_write_row (row %u, pass %d)", | ||
619 | png_ptr->row_number, png_ptr->pass); | ||
620 | |||
621 | /* Initialize transformations and other stuff if first time */ | ||
622 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) | ||
623 | { | ||
624 | /* Make sure we wrote the header info */ | ||
625 | if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) | ||
626 | png_error(png_ptr, | ||
627 | "png_write_info was never called before png_write_row"); | ||
628 | |||
629 | /* Check for transforms that have been set but were defined out */ | ||
630 | #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) | ||
631 | if (png_ptr->transformations & PNG_INVERT_MONO) | ||
632 | png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); | ||
633 | #endif | ||
634 | |||
635 | #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) | ||
636 | if (png_ptr->transformations & PNG_FILLER) | ||
637 | png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); | ||
638 | #endif | ||
639 | #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ | ||
640 | defined(PNG_READ_PACKSWAP_SUPPORTED) | ||
641 | if (png_ptr->transformations & PNG_PACKSWAP) | ||
642 | png_warning(png_ptr, | ||
643 | "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); | ||
644 | #endif | ||
645 | |||
646 | #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) | ||
647 | if (png_ptr->transformations & PNG_PACK) | ||
648 | png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); | ||
649 | #endif | ||
650 | |||
651 | #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) | ||
652 | if (png_ptr->transformations & PNG_SHIFT) | ||
653 | png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); | ||
654 | #endif | ||
655 | |||
656 | #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) | ||
657 | if (png_ptr->transformations & PNG_BGR) | ||
658 | png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); | ||
659 | #endif | ||
660 | |||
661 | #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) | ||
662 | if (png_ptr->transformations & PNG_SWAP_BYTES) | ||
663 | png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); | ||
664 | #endif | ||
665 | |||
666 | png_write_start_row(png_ptr); | ||
667 | } | ||
668 | |||
669 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED | ||
670 | /* If interlaced and not interested in row, return */ | ||
671 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) | ||
672 | { | ||
673 | switch (png_ptr->pass) | ||
674 | { | ||
675 | case 0: | ||
676 | if (png_ptr->row_number & 0x07) | ||
677 | { | ||
678 | png_write_finish_row(png_ptr); | ||
679 | return; | ||
680 | } | ||
681 | break; | ||
682 | |||
683 | case 1: | ||
684 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) | ||
685 | { | ||
686 | png_write_finish_row(png_ptr); | ||
687 | return; | ||
688 | } | ||
689 | break; | ||
690 | |||
691 | case 2: | ||
692 | if ((png_ptr->row_number & 0x07) != 4) | ||
693 | { | ||
694 | png_write_finish_row(png_ptr); | ||
695 | return; | ||
696 | } | ||
697 | break; | ||
698 | |||
699 | case 3: | ||
700 | if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) | ||
701 | { | ||
702 | png_write_finish_row(png_ptr); | ||
703 | return; | ||
704 | } | ||
705 | break; | ||
706 | |||
707 | case 4: | ||
708 | if ((png_ptr->row_number & 0x03) != 2) | ||
709 | { | ||
710 | png_write_finish_row(png_ptr); | ||
711 | return; | ||
712 | } | ||
713 | break; | ||
714 | |||
715 | case 5: | ||
716 | if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) | ||
717 | { | ||
718 | png_write_finish_row(png_ptr); | ||
719 | return; | ||
720 | } | ||
721 | break; | ||
722 | |||
723 | case 6: | ||
724 | if (!(png_ptr->row_number & 0x01)) | ||
725 | { | ||
726 | png_write_finish_row(png_ptr); | ||
727 | return; | ||
728 | } | ||
729 | break; | ||
730 | |||
731 | default: /* error: ignore it */ | ||
732 | break; | ||
733 | } | ||
734 | } | ||
735 | #endif | ||
736 | |||
737 | /* Set up row info for transformations */ | ||
738 | row_info.color_type = png_ptr->color_type; | ||
739 | row_info.width = png_ptr->usr_width; | ||
740 | row_info.channels = png_ptr->usr_channels; | ||
741 | row_info.bit_depth = png_ptr->usr_bit_depth; | ||
742 | row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels); | ||
743 | row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); | ||
744 | |||
745 | png_debug1(3, "row_info->color_type = %d", row_info.color_type); | ||
746 | png_debug1(3, "row_info->width = %u", row_info.width); | ||
747 | png_debug1(3, "row_info->channels = %d", row_info.channels); | ||
748 | png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth); | ||
749 | png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth); | ||
750 | png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes); | ||
751 | |||
752 | /* Copy user's row into buffer, leaving room for filter byte. */ | ||
753 | png_memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes); | ||
754 | |||
755 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED | ||
756 | /* Handle interlacing */ | ||
757 | if (png_ptr->interlaced && png_ptr->pass < 6 && | ||
758 | (png_ptr->transformations & PNG_INTERLACE)) | ||
759 | { | ||
760 | png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass); | ||
761 | /* This should always get caught above, but still ... */ | ||
762 | if (!(row_info.width)) | ||
763 | { | ||
764 | png_write_finish_row(png_ptr); | ||
765 | return; | ||
766 | } | ||
767 | } | ||
768 | #endif | ||
769 | |||
770 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED | ||
771 | /* Handle other transformations */ | ||
772 | if (png_ptr->transformations) | ||
773 | png_do_write_transformations(png_ptr, &row_info); | ||
774 | #endif | ||
775 | |||
776 | /* At this point the row_info pixel depth must match the 'transformed' depth, | ||
777 | * which is also the output depth. | ||
778 | */ | ||
779 | if (row_info.pixel_depth != png_ptr->pixel_depth || | ||
780 | row_info.pixel_depth != png_ptr->transformed_pixel_depth) | ||
781 | png_error(png_ptr, "internal write transform logic error"); | ||
782 | |||
783 | #ifdef PNG_MNG_FEATURES_SUPPORTED | ||
784 | /* Write filter_method 64 (intrapixel differencing) only if | ||
785 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and | ||
786 | * 2. Libpng did not write a PNG signature (this filter_method is only | ||
787 | * used in PNG datastreams that are embedded in MNG datastreams) and | ||
788 | * 3. The application called png_permit_mng_features with a mask that | ||
789 | * included PNG_FLAG_MNG_FILTER_64 and | ||
790 | * 4. The filter_method is 64 and | ||
791 | * 5. The color_type is RGB or RGBA | ||
792 | */ | ||
793 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && | ||
794 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) | ||
795 | { | ||
796 | /* Intrapixel differencing */ | ||
797 | png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1); | ||
798 | } | ||
799 | #endif | ||
800 | |||
801 | /* Find a filter if necessary, filter the row and write it out. */ | ||
802 | png_write_find_filter(png_ptr, &row_info); | ||
803 | |||
804 | if (png_ptr->write_row_fn != NULL) | ||
805 | (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); | ||
806 | } | ||
807 | |||
808 | #ifdef PNG_WRITE_FLUSH_SUPPORTED | ||
809 | /* Set the automatic flush interval or 0 to turn flushing off */ | ||
810 | void PNGAPI | ||
811 | png_set_flush(png_structp png_ptr, int nrows) | ||
812 | { | ||
813 | png_debug(1, "in png_set_flush"); | ||
814 | |||
815 | if (png_ptr == NULL) | ||
816 | return; | ||
817 | |||
818 | png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); | ||
819 | } | ||
820 | |||
821 | /* Flush the current output buffers now */ | ||
822 | void PNGAPI | ||
823 | png_write_flush(png_structp png_ptr) | ||
824 | { | ||
825 | int wrote_IDAT; | ||
826 | |||
827 | png_debug(1, "in png_write_flush"); | ||
828 | |||
829 | if (png_ptr == NULL) | ||
830 | return; | ||
831 | |||
832 | /* We have already written out all of the data */ | ||
833 | if (png_ptr->row_number >= png_ptr->num_rows) | ||
834 | return; | ||
835 | |||
836 | do | ||
837 | { | ||
838 | int ret; | ||
839 | |||
840 | /* Compress the data */ | ||
841 | ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); | ||
842 | wrote_IDAT = 0; | ||
843 | |||
844 | /* Check for compression errors */ | ||
845 | if (ret != Z_OK) | ||
846 | { | ||
847 | if (png_ptr->zstream.msg != NULL) | ||
848 | png_error(png_ptr, png_ptr->zstream.msg); | ||
849 | |||
850 | else | ||
851 | png_error(png_ptr, "zlib error"); | ||
852 | } | ||
853 | |||
854 | if (!(png_ptr->zstream.avail_out)) | ||
855 | { | ||
856 | /* Write the IDAT and reset the zlib output buffer */ | ||
857 | png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); | ||
858 | wrote_IDAT = 1; | ||
859 | } | ||
860 | } while (wrote_IDAT == 1); | ||
861 | |||
862 | /* If there is any data left to be output, write it into a new IDAT */ | ||
863 | if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) | ||
864 | { | ||
865 | /* Write the IDAT and reset the zlib output buffer */ | ||
866 | png_write_IDAT(png_ptr, png_ptr->zbuf, | ||
867 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); | ||
868 | } | ||
869 | png_ptr->flush_rows = 0; | ||
870 | png_flush(png_ptr); | ||
871 | } | ||
872 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ | ||
873 | |||
874 | /* Free all memory used by the write */ | ||
875 | void PNGAPI | ||
876 | png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) | ||
877 | { | ||
878 | png_structp png_ptr = NULL; | ||
879 | png_infop info_ptr = NULL; | ||
880 | #ifdef PNG_USER_MEM_SUPPORTED | ||
881 | png_free_ptr free_fn = NULL; | ||
882 | png_voidp mem_ptr = NULL; | ||
883 | #endif | ||
884 | |||
885 | png_debug(1, "in png_destroy_write_struct"); | ||
886 | |||
887 | if (png_ptr_ptr != NULL) | ||
888 | png_ptr = *png_ptr_ptr; | ||
889 | |||
890 | #ifdef PNG_USER_MEM_SUPPORTED | ||
891 | if (png_ptr != NULL) | ||
892 | { | ||
893 | free_fn = png_ptr->free_fn; | ||
894 | mem_ptr = png_ptr->mem_ptr; | ||
895 | } | ||
896 | #endif | ||
897 | |||
898 | if (info_ptr_ptr != NULL) | ||
899 | info_ptr = *info_ptr_ptr; | ||
900 | |||
901 | if (info_ptr != NULL) | ||
902 | { | ||
903 | if (png_ptr != NULL) | ||
904 | { | ||
905 | png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); | ||
906 | |||
907 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED | ||
908 | if (png_ptr->num_chunk_list) | ||
909 | { | ||
910 | png_free(png_ptr, png_ptr->chunk_list); | ||
911 | png_ptr->num_chunk_list = 0; | ||
912 | } | ||
913 | #endif | ||
914 | } | ||
915 | |||
916 | #ifdef PNG_USER_MEM_SUPPORTED | ||
917 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, | ||
918 | (png_voidp)mem_ptr); | ||
919 | #else | ||
920 | png_destroy_struct((png_voidp)info_ptr); | ||
921 | #endif | ||
922 | *info_ptr_ptr = NULL; | ||
923 | } | ||
924 | |||
925 | if (png_ptr != NULL) | ||
926 | { | ||
927 | png_write_destroy(png_ptr); | ||
928 | #ifdef PNG_USER_MEM_SUPPORTED | ||
929 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, | ||
930 | (png_voidp)mem_ptr); | ||
931 | #else | ||
932 | png_destroy_struct((png_voidp)png_ptr); | ||
933 | #endif | ||
934 | *png_ptr_ptr = NULL; | ||
935 | } | ||
936 | } | ||
937 | |||
938 | |||
939 | /* Free any memory used in png_ptr struct (old method) */ | ||
940 | void /* PRIVATE */ | ||
941 | png_write_destroy(png_structp png_ptr) | ||
942 | { | ||
943 | #ifdef PNG_SETJMP_SUPPORTED | ||
944 | jmp_buf tmp_jmp; /* Save jump buffer */ | ||
945 | #endif | ||
946 | png_error_ptr error_fn; | ||
947 | #ifdef PNG_WARNINGS_SUPPORTED | ||
948 | png_error_ptr warning_fn; | ||
949 | #endif | ||
950 | png_voidp error_ptr; | ||
951 | #ifdef PNG_USER_MEM_SUPPORTED | ||
952 | png_free_ptr free_fn; | ||
953 | #endif | ||
954 | |||
955 | png_debug(1, "in png_write_destroy"); | ||
956 | |||
957 | /* Free any memory zlib uses */ | ||
958 | if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED) | ||
959 | deflateEnd(&png_ptr->zstream); | ||
960 | |||
961 | /* Free our memory. png_free checks NULL for us. */ | ||
962 | png_free(png_ptr, png_ptr->zbuf); | ||
963 | png_free(png_ptr, png_ptr->row_buf); | ||
964 | #ifdef PNG_WRITE_FILTER_SUPPORTED | ||
965 | png_free(png_ptr, png_ptr->prev_row); | ||
966 | png_free(png_ptr, png_ptr->sub_row); | ||
967 | png_free(png_ptr, png_ptr->up_row); | ||
968 | png_free(png_ptr, png_ptr->avg_row); | ||
969 | png_free(png_ptr, png_ptr->paeth_row); | ||
970 | #endif | ||
971 | |||
972 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED | ||
973 | /* Use this to save a little code space, it doesn't free the filter_costs */ | ||
974 | png_reset_filter_heuristics(png_ptr); | ||
975 | png_free(png_ptr, png_ptr->filter_costs); | ||
976 | png_free(png_ptr, png_ptr->inv_filter_costs); | ||
977 | #endif | ||
978 | |||
979 | #ifdef PNG_SETJMP_SUPPORTED | ||
980 | /* Reset structure */ | ||
981 | png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); | ||
982 | #endif | ||
983 | |||
984 | error_fn = png_ptr->error_fn; | ||
985 | #ifdef PNG_WARNINGS_SUPPORTED | ||
986 | warning_fn = png_ptr->warning_fn; | ||
987 | #endif | ||
988 | error_ptr = png_ptr->error_ptr; | ||
989 | #ifdef PNG_USER_MEM_SUPPORTED | ||
990 | free_fn = png_ptr->free_fn; | ||
991 | #endif | ||
992 | |||
993 | png_memset(png_ptr, 0, png_sizeof(png_struct)); | ||
994 | |||
995 | png_ptr->error_fn = error_fn; | ||
996 | #ifdef PNG_WARNINGS_SUPPORTED | ||
997 | png_ptr->warning_fn = warning_fn; | ||
998 | #endif | ||
999 | png_ptr->error_ptr = error_ptr; | ||
1000 | #ifdef PNG_USER_MEM_SUPPORTED | ||
1001 | png_ptr->free_fn = free_fn; | ||
1002 | #endif | ||
1003 | |||
1004 | #ifdef PNG_SETJMP_SUPPORTED | ||
1005 | png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); | ||
1006 | #endif | ||
1007 | } | ||
1008 | |||
1009 | /* Allow the application to select one or more row filters to use. */ | ||
1010 | void PNGAPI | ||
1011 | png_set_filter(png_structp png_ptr, int method, int filters) | ||
1012 | { | ||
1013 | png_debug(1, "in png_set_filter"); | ||
1014 | |||
1015 | if (png_ptr == NULL) | ||
1016 | return; | ||
1017 | |||
1018 | #ifdef PNG_MNG_FEATURES_SUPPORTED | ||
1019 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && | ||
1020 | (method == PNG_INTRAPIXEL_DIFFERENCING)) | ||
1021 | method = PNG_FILTER_TYPE_BASE; | ||
1022 | |||
1023 | #endif | ||
1024 | if (method == PNG_FILTER_TYPE_BASE) | ||
1025 | { | ||
1026 | switch (filters & (PNG_ALL_FILTERS | 0x07)) | ||
1027 | { | ||
1028 | #ifdef PNG_WRITE_FILTER_SUPPORTED | ||
1029 | case 5: | ||
1030 | case 6: | ||
1031 | case 7: png_warning(png_ptr, "Unknown row filter for method 0"); | ||
1032 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ | ||
1033 | case PNG_FILTER_VALUE_NONE: | ||
1034 | png_ptr->do_filter = PNG_FILTER_NONE; break; | ||
1035 | |||
1036 | #ifdef PNG_WRITE_FILTER_SUPPORTED | ||
1037 | case PNG_FILTER_VALUE_SUB: | ||
1038 | png_ptr->do_filter = PNG_FILTER_SUB; break; | ||
1039 | |||
1040 | case PNG_FILTER_VALUE_UP: | ||
1041 | png_ptr->do_filter = PNG_FILTER_UP; break; | ||
1042 | |||
1043 | case PNG_FILTER_VALUE_AVG: | ||
1044 | png_ptr->do_filter = PNG_FILTER_AVG; break; | ||
1045 | |||
1046 | case PNG_FILTER_VALUE_PAETH: | ||
1047 | png_ptr->do_filter = PNG_FILTER_PAETH; break; | ||
1048 | |||
1049 | default: | ||
1050 | png_ptr->do_filter = (png_byte)filters; break; | ||
1051 | #else | ||
1052 | default: | ||
1053 | png_warning(png_ptr, "Unknown row filter for method 0"); | ||
1054 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ | ||
1055 | } | ||
1056 | |||
1057 | /* If we have allocated the row_buf, this means we have already started | ||
1058 | * with the image and we should have allocated all of the filter buffers | ||
1059 | * that have been selected. If prev_row isn't already allocated, then | ||
1060 | * it is too late to start using the filters that need it, since we | ||
1061 | * will be missing the data in the previous row. If an application | ||
1062 | * wants to start and stop using particular filters during compression, | ||
1063 | * it should start out with all of the filters, and then add and | ||
1064 | * remove them after the start of compression. | ||
1065 | */ | ||
1066 | if (png_ptr->row_buf != NULL) | ||
1067 | { | ||
1068 | #ifdef PNG_WRITE_FILTER_SUPPORTED | ||
1069 | if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) | ||
1070 | { | ||
1071 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, | ||
1072 | (png_ptr->rowbytes + 1)); | ||
1073 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; | ||
1074 | } | ||
1075 | |||
1076 | if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) | ||
1077 | { | ||
1078 | if (png_ptr->prev_row == NULL) | ||
1079 | { | ||
1080 | png_warning(png_ptr, "Can't add Up filter after starting"); | ||
1081 | png_ptr->do_filter = (png_byte)(png_ptr->do_filter & | ||
1082 | ~PNG_FILTER_UP); | ||
1083 | } | ||
1084 | |||
1085 | else | ||
1086 | { | ||
1087 | png_ptr->up_row = (png_bytep)png_malloc(png_ptr, | ||
1088 | (png_ptr->rowbytes + 1)); | ||
1089 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; | ||
1090 | } | ||
1091 | } | ||
1092 | |||
1093 | if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL) | ||
1094 | { | ||
1095 | if (png_ptr->prev_row == NULL) | ||
1096 | { | ||
1097 | png_warning(png_ptr, "Can't add Average filter after starting"); | ||
1098 | png_ptr->do_filter = (png_byte)(png_ptr->do_filter & | ||
1099 | ~PNG_FILTER_AVG); | ||
1100 | } | ||
1101 | |||
1102 | else | ||
1103 | { | ||
1104 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, | ||
1105 | (png_ptr->rowbytes + 1)); | ||
1106 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; | ||
1107 | } | ||
1108 | } | ||
1109 | |||
1110 | if ((png_ptr->do_filter & PNG_FILTER_PAETH) && | ||
1111 | png_ptr->paeth_row == NULL) | ||
1112 | { | ||
1113 | if (png_ptr->prev_row == NULL) | ||
1114 | { | ||
1115 | png_warning(png_ptr, "Can't add Paeth filter after starting"); | ||
1116 | png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); | ||
1117 | } | ||
1118 | |||
1119 | else | ||
1120 | { | ||
1121 | png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, | ||
1122 | (png_ptr->rowbytes + 1)); | ||
1123 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; | ||
1124 | } | ||
1125 | } | ||
1126 | |||
1127 | if (png_ptr->do_filter == PNG_NO_FILTERS) | ||
1128 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ | ||
1129 | png_ptr->do_filter = PNG_FILTER_NONE; | ||
1130 | } | ||
1131 | } | ||
1132 | else | ||
1133 | png_error(png_ptr, "Unknown custom filter method"); | ||
1134 | } | ||
1135 | |||
1136 | /* This allows us to influence the way in which libpng chooses the "best" | ||
1137 | * filter for the current scanline. While the "minimum-sum-of-absolute- | ||
1138 | * differences metric is relatively fast and effective, there is some | ||
1139 | * question as to whether it can be improved upon by trying to keep the | ||
1140 | * filtered data going to zlib more consistent, hopefully resulting in | ||
1141 | * better compression. | ||
1142 | */ | ||
1143 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ | ||
1144 | /* Convenience reset API. */ | ||
1145 | static void | ||
1146 | png_reset_filter_heuristics(png_structp png_ptr) | ||
1147 | { | ||
1148 | /* Clear out any old values in the 'weights' - this must be done because if | ||
1149 | * the app calls set_filter_heuristics multiple times with different | ||
1150 | * 'num_weights' values we would otherwise potentially have wrong sized | ||
1151 | * arrays. | ||
1152 | */ | ||
1153 | png_ptr->num_prev_filters = 0; | ||
1154 | png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; | ||
1155 | if (png_ptr->prev_filters != NULL) | ||
1156 | { | ||
1157 | png_bytep old = png_ptr->prev_filters; | ||
1158 | png_ptr->prev_filters = NULL; | ||
1159 | png_free(png_ptr, old); | ||
1160 | } | ||
1161 | if (png_ptr->filter_weights != NULL) | ||
1162 | { | ||
1163 | png_uint_16p old = png_ptr->filter_weights; | ||
1164 | png_ptr->filter_weights = NULL; | ||
1165 | png_free(png_ptr, old); | ||
1166 | } | ||
1167 | |||
1168 | if (png_ptr->inv_filter_weights != NULL) | ||
1169 | { | ||
1170 | png_uint_16p old = png_ptr->inv_filter_weights; | ||
1171 | png_ptr->inv_filter_weights = NULL; | ||
1172 | png_free(png_ptr, old); | ||
1173 | } | ||
1174 | |||
1175 | /* Leave the filter_costs - this array is fixed size. */ | ||
1176 | } | ||
1177 | |||
1178 | static int | ||
1179 | png_init_filter_heuristics(png_structp png_ptr, int heuristic_method, | ||
1180 | int num_weights) | ||
1181 | { | ||
1182 | if (png_ptr == NULL) | ||
1183 | return 0; | ||
1184 | |||
1185 | /* Clear out the arrays */ | ||
1186 | png_reset_filter_heuristics(png_ptr); | ||
1187 | |||
1188 | /* Check arguments; the 'reset' function makes the correct settings for the | ||
1189 | * unweighted case, but we must handle the weight case by initializing the | ||
1190 | * arrays for the caller. | ||
1191 | */ | ||
1192 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) | ||
1193 | { | ||
1194 | int i; | ||
1195 | |||
1196 | if (num_weights > 0) | ||
1197 | { | ||
1198 | png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, | ||
1199 | (png_uint_32)(png_sizeof(png_byte) * num_weights)); | ||
1200 | |||
1201 | /* To make sure that the weighting starts out fairly */ | ||
1202 | for (i = 0; i < num_weights; i++) | ||
1203 | { | ||
1204 | png_ptr->prev_filters[i] = 255; | ||
1205 | } | ||
1206 | |||
1207 | png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, | ||
1208 | (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); | ||
1209 | |||
1210 | png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, | ||
1211 | (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); | ||
1212 | |||
1213 | for (i = 0; i < num_weights; i++) | ||
1214 | { | ||
1215 | png_ptr->inv_filter_weights[i] = | ||
1216 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; | ||
1217 | } | ||
1218 | |||
1219 | /* Safe to set this now */ | ||
1220 | png_ptr->num_prev_filters = (png_byte)num_weights; | ||
1221 | } | ||
1222 | |||
1223 | /* If, in the future, there are other filter methods, this would | ||
1224 | * need to be based on png_ptr->filter. | ||
1225 | */ | ||
1226 | if (png_ptr->filter_costs == NULL) | ||
1227 | { | ||
1228 | png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, | ||
1229 | (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); | ||
1230 | |||
1231 | png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, | ||
1232 | (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); | ||
1233 | } | ||
1234 | |||
1235 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) | ||
1236 | { | ||
1237 | png_ptr->inv_filter_costs[i] = | ||
1238 | png_ptr->filter_costs[i] = PNG_COST_FACTOR; | ||
1239 | } | ||
1240 | |||
1241 | /* All the arrays are inited, safe to set this: */ | ||
1242 | png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED; | ||
1243 | |||
1244 | /* Return the 'ok' code. */ | ||
1245 | return 1; | ||
1246 | } | ||
1247 | else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT || | ||
1248 | heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) | ||
1249 | { | ||
1250 | return 1; | ||
1251 | } | ||
1252 | else | ||
1253 | { | ||
1254 | png_warning(png_ptr, "Unknown filter heuristic method"); | ||
1255 | return 0; | ||
1256 | } | ||
1257 | } | ||
1258 | |||
1259 | /* Provide floating and fixed point APIs */ | ||
1260 | #ifdef PNG_FLOATING_POINT_SUPPORTED | ||
1261 | void PNGAPI | ||
1262 | png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, | ||
1263 | int num_weights, png_const_doublep filter_weights, | ||
1264 | png_const_doublep filter_costs) | ||
1265 | { | ||
1266 | png_debug(1, "in png_set_filter_heuristics"); | ||
1267 | |||
1268 | /* The internal API allocates all the arrays and ensures that the elements of | ||
1269 | * those arrays are set to the default value. | ||
1270 | */ | ||
1271 | if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) | ||
1272 | return; | ||
1273 | |||
1274 | /* If using the weighted method copy in the weights. */ | ||
1275 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) | ||
1276 | { | ||
1277 | int i; | ||
1278 | for (i = 0; i < num_weights; i++) | ||
1279 | { | ||
1280 | if (filter_weights[i] <= 0.0) | ||
1281 | { | ||
1282 | png_ptr->inv_filter_weights[i] = | ||
1283 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; | ||
1284 | } | ||
1285 | |||
1286 | else | ||
1287 | { | ||
1288 | png_ptr->inv_filter_weights[i] = | ||
1289 | (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5); | ||
1290 | |||
1291 | png_ptr->filter_weights[i] = | ||
1292 | (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5); | ||
1293 | } | ||
1294 | } | ||
1295 | |||
1296 | /* Here is where we set the relative costs of the different filters. We | ||
1297 | * should take the desired compression level into account when setting | ||
1298 | * the costs, so that Paeth, for instance, has a high relative cost at low | ||
1299 | * compression levels, while it has a lower relative cost at higher | ||
1300 | * compression settings. The filter types are in order of increasing | ||
1301 | * relative cost, so it would be possible to do this with an algorithm. | ||
1302 | */ | ||
1303 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0) | ||
1304 | { | ||
1305 | png_ptr->inv_filter_costs[i] = | ||
1306 | (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5); | ||
1307 | |||
1308 | png_ptr->filter_costs[i] = | ||
1309 | (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5); | ||
1310 | } | ||
1311 | } | ||
1312 | } | ||
1313 | #endif /* FLOATING_POINT */ | ||
1314 | |||
1315 | #ifdef PNG_FIXED_POINT_SUPPORTED | ||
1316 | void PNGAPI | ||
1317 | png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method, | ||
1318 | int num_weights, png_const_fixed_point_p filter_weights, | ||
1319 | png_const_fixed_point_p filter_costs) | ||
1320 | { | ||
1321 | png_debug(1, "in png_set_filter_heuristics_fixed"); | ||
1322 | |||
1323 | /* The internal API allocates all the arrays and ensures that the elements of | ||
1324 | * those arrays are set to the default value. | ||
1325 | */ | ||
1326 | if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) | ||
1327 | return; | ||
1328 | |||
1329 | /* If using the weighted method copy in the weights. */ | ||
1330 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) | ||
1331 | { | ||
1332 | int i; | ||
1333 | for (i = 0; i < num_weights; i++) | ||
1334 | { | ||
1335 | if (filter_weights[i] <= 0) | ||
1336 | { | ||
1337 | png_ptr->inv_filter_weights[i] = | ||
1338 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; | ||
1339 | } | ||
1340 | |||
1341 | else | ||
1342 | { | ||
1343 | png_ptr->inv_filter_weights[i] = (png_uint_16) | ||
1344 | ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1); | ||
1345 | |||
1346 | png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR* | ||
1347 | PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]); | ||
1348 | } | ||
1349 | } | ||
1350 | |||
1351 | /* Here is where we set the relative costs of the different filters. We | ||
1352 | * should take the desired compression level into account when setting | ||
1353 | * the costs, so that Paeth, for instance, has a high relative cost at low | ||
1354 | * compression levels, while it has a lower relative cost at higher | ||
1355 | * compression settings. The filter types are in order of increasing | ||
1356 | * relative cost, so it would be possible to do this with an algorithm. | ||
1357 | */ | ||
1358 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) | ||
1359 | if (filter_costs[i] >= PNG_FP_1) | ||
1360 | { | ||
1361 | png_uint_32 tmp; | ||
1362 | |||
1363 | /* Use a 32 bit unsigned temporary here because otherwise the | ||
1364 | * intermediate value will be a 32 bit *signed* integer (ANSI rules) | ||
1365 | * and this will get the wrong answer on division. | ||
1366 | */ | ||
1367 | tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2); | ||
1368 | tmp /= filter_costs[i]; | ||
1369 | |||
1370 | png_ptr->inv_filter_costs[i] = (png_uint_16)tmp; | ||
1371 | |||
1372 | tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF; | ||
1373 | tmp /= PNG_FP_1; | ||
1374 | |||
1375 | png_ptr->filter_costs[i] = (png_uint_16)tmp; | ||
1376 | } | ||
1377 | } | ||
1378 | } | ||
1379 | #endif /* FIXED_POINT */ | ||
1380 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ | ||
1381 | |||
1382 | void PNGAPI | ||
1383 | png_set_compression_level(png_structp png_ptr, int level) | ||
1384 | { | ||
1385 | png_debug(1, "in png_set_compression_level"); | ||
1386 | |||
1387 | if (png_ptr == NULL) | ||
1388 | return; | ||
1389 | |||
1390 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; | ||
1391 | png_ptr->zlib_level = level; | ||
1392 | } | ||
1393 | |||
1394 | void PNGAPI | ||
1395 | png_set_compression_mem_level(png_structp png_ptr, int mem_level) | ||
1396 | { | ||
1397 | png_debug(1, "in png_set_compression_mem_level"); | ||
1398 | |||
1399 | if (png_ptr == NULL) | ||
1400 | return; | ||
1401 | |||
1402 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; | ||
1403 | png_ptr->zlib_mem_level = mem_level; | ||
1404 | } | ||
1405 | |||
1406 | void PNGAPI | ||
1407 | png_set_compression_strategy(png_structp png_ptr, int strategy) | ||
1408 | { | ||
1409 | png_debug(1, "in png_set_compression_strategy"); | ||
1410 | |||
1411 | if (png_ptr == NULL) | ||
1412 | return; | ||
1413 | |||
1414 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; | ||
1415 | png_ptr->zlib_strategy = strategy; | ||
1416 | } | ||
1417 | |||
1418 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | ||
1419 | * smaller value of window_bits if it can do so safely. | ||
1420 | */ | ||
1421 | void PNGAPI | ||
1422 | png_set_compression_window_bits(png_structp png_ptr, int window_bits) | ||
1423 | { | ||
1424 | if (png_ptr == NULL) | ||
1425 | return; | ||
1426 | |||
1427 | if (window_bits > 15) | ||
1428 | png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); | ||
1429 | |||
1430 | else if (window_bits < 8) | ||
1431 | png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); | ||
1432 | |||
1433 | #ifndef WBITS_8_OK | ||
1434 | /* Avoid libpng bug with 256-byte windows */ | ||
1435 | if (window_bits == 8) | ||
1436 | { | ||
1437 | png_warning(png_ptr, "Compression window is being reset to 512"); | ||
1438 | window_bits = 9; | ||
1439 | } | ||
1440 | |||
1441 | #endif | ||
1442 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; | ||
1443 | png_ptr->zlib_window_bits = window_bits; | ||
1444 | } | ||
1445 | |||
1446 | void PNGAPI | ||
1447 | png_set_compression_method(png_structp png_ptr, int method) | ||
1448 | { | ||
1449 | png_debug(1, "in png_set_compression_method"); | ||
1450 | |||
1451 | if (png_ptr == NULL) | ||
1452 | return; | ||
1453 | |||
1454 | if (method != 8) | ||
1455 | png_warning(png_ptr, "Only compression method 8 is supported by PNG"); | ||
1456 | |||
1457 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; | ||
1458 | png_ptr->zlib_method = method; | ||
1459 | } | ||
1460 | |||
1461 | /* The following were added to libpng-1.5.4 */ | ||
1462 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED | ||
1463 | void PNGAPI | ||
1464 | png_set_text_compression_level(png_structp png_ptr, int level) | ||
1465 | { | ||
1466 | png_debug(1, "in png_set_text_compression_level"); | ||
1467 | |||
1468 | if (png_ptr == NULL) | ||
1469 | return; | ||
1470 | |||
1471 | png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL; | ||
1472 | png_ptr->zlib_text_level = level; | ||
1473 | } | ||
1474 | |||
1475 | void PNGAPI | ||
1476 | png_set_text_compression_mem_level(png_structp png_ptr, int mem_level) | ||
1477 | { | ||
1478 | png_debug(1, "in png_set_text_compression_mem_level"); | ||
1479 | |||
1480 | if (png_ptr == NULL) | ||
1481 | return; | ||
1482 | |||
1483 | png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL; | ||
1484 | png_ptr->zlib_text_mem_level = mem_level; | ||
1485 | } | ||
1486 | |||
1487 | void PNGAPI | ||
1488 | png_set_text_compression_strategy(png_structp png_ptr, int strategy) | ||
1489 | { | ||
1490 | png_debug(1, "in png_set_text_compression_strategy"); | ||
1491 | |||
1492 | if (png_ptr == NULL) | ||
1493 | return; | ||
1494 | |||
1495 | png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY; | ||
1496 | png_ptr->zlib_text_strategy = strategy; | ||
1497 | } | ||
1498 | |||
1499 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | ||
1500 | * smaller value of window_bits if it can do so safely. | ||
1501 | */ | ||
1502 | void PNGAPI | ||
1503 | png_set_text_compression_window_bits(png_structp png_ptr, int window_bits) | ||
1504 | { | ||
1505 | if (png_ptr == NULL) | ||
1506 | return; | ||
1507 | |||
1508 | if (window_bits > 15) | ||
1509 | png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); | ||
1510 | |||
1511 | else if (window_bits < 8) | ||
1512 | png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); | ||
1513 | |||
1514 | #ifndef WBITS_8_OK | ||
1515 | /* Avoid libpng bug with 256-byte windows */ | ||
1516 | if (window_bits == 8) | ||
1517 | { | ||
1518 | png_warning(png_ptr, "Text compression window is being reset to 512"); | ||
1519 | window_bits = 9; | ||
1520 | } | ||
1521 | |||
1522 | #endif | ||
1523 | png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS; | ||
1524 | png_ptr->zlib_text_window_bits = window_bits; | ||
1525 | } | ||
1526 | |||
1527 | void PNGAPI | ||
1528 | png_set_text_compression_method(png_structp png_ptr, int method) | ||
1529 | { | ||
1530 | png_debug(1, "in png_set_text_compression_method"); | ||
1531 | |||
1532 | if (png_ptr == NULL) | ||
1533 | return; | ||
1534 | |||
1535 | if (method != 8) | ||
1536 | png_warning(png_ptr, "Only compression method 8 is supported by PNG"); | ||
1537 | |||
1538 | png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_METHOD; | ||
1539 | png_ptr->zlib_text_method = method; | ||
1540 | } | ||
1541 | #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ | ||
1542 | /* end of API added to libpng-1.5.4 */ | ||
1543 | |||
1544 | void PNGAPI | ||
1545 | png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) | ||
1546 | { | ||
1547 | if (png_ptr == NULL) | ||
1548 | return; | ||
1549 | |||
1550 | png_ptr->write_row_fn = write_row_fn; | ||
1551 | } | ||
1552 | |||
1553 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED | ||
1554 | void PNGAPI | ||
1555 | png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr | ||
1556 | write_user_transform_fn) | ||
1557 | { | ||
1558 | png_debug(1, "in png_set_write_user_transform_fn"); | ||
1559 | |||
1560 | if (png_ptr == NULL) | ||
1561 | return; | ||
1562 | |||
1563 | png_ptr->transformations |= PNG_USER_TRANSFORM; | ||
1564 | png_ptr->write_user_transform_fn = write_user_transform_fn; | ||
1565 | } | ||
1566 | #endif | ||
1567 | |||
1568 | |||
1569 | #ifdef PNG_INFO_IMAGE_SUPPORTED | ||
1570 | void PNGAPI | ||
1571 | png_write_png(png_structp png_ptr, png_infop info_ptr, | ||
1572 | int transforms, voidp params) | ||
1573 | { | ||
1574 | if (png_ptr == NULL || info_ptr == NULL) | ||
1575 | return; | ||
1576 | |||
1577 | /* Write the file header information. */ | ||
1578 | png_write_info(png_ptr, info_ptr); | ||
1579 | |||
1580 | /* ------ these transformations don't touch the info structure ------- */ | ||
1581 | |||
1582 | #ifdef PNG_WRITE_INVERT_SUPPORTED | ||
1583 | /* Invert monochrome pixels */ | ||
1584 | if (transforms & PNG_TRANSFORM_INVERT_MONO) | ||
1585 | png_set_invert_mono(png_ptr); | ||
1586 | #endif | ||
1587 | |||
1588 | #ifdef PNG_WRITE_SHIFT_SUPPORTED | ||
1589 | /* Shift the pixels up to a legal bit depth and fill in | ||
1590 | * as appropriate to correctly scale the image. | ||
1591 | */ | ||
1592 | if ((transforms & PNG_TRANSFORM_SHIFT) | ||
1593 | && (info_ptr->valid & PNG_INFO_sBIT)) | ||
1594 | png_set_shift(png_ptr, &info_ptr->sig_bit); | ||
1595 | #endif | ||
1596 | |||
1597 | #ifdef PNG_WRITE_PACK_SUPPORTED | ||
1598 | /* Pack pixels into bytes */ | ||
1599 | if (transforms & PNG_TRANSFORM_PACKING) | ||
1600 | png_set_packing(png_ptr); | ||
1601 | #endif | ||
1602 | |||
1603 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED | ||
1604 | /* Swap location of alpha bytes from ARGB to RGBA */ | ||
1605 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) | ||
1606 | png_set_swap_alpha(png_ptr); | ||
1607 | #endif | ||
1608 | |||
1609 | #ifdef PNG_WRITE_FILLER_SUPPORTED | ||
1610 | /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */ | ||
1611 | if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) | ||
1612 | png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); | ||
1613 | |||
1614 | else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) | ||
1615 | png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); | ||
1616 | #endif | ||
1617 | |||
1618 | #ifdef PNG_WRITE_BGR_SUPPORTED | ||
1619 | /* Flip BGR pixels to RGB */ | ||
1620 | if (transforms & PNG_TRANSFORM_BGR) | ||
1621 | png_set_bgr(png_ptr); | ||
1622 | #endif | ||
1623 | |||
1624 | #ifdef PNG_WRITE_SWAP_SUPPORTED | ||
1625 | /* Swap bytes of 16-bit files to most significant byte first */ | ||
1626 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) | ||
1627 | png_set_swap(png_ptr); | ||
1628 | #endif | ||
1629 | |||
1630 | #ifdef PNG_WRITE_PACKSWAP_SUPPORTED | ||
1631 | /* Swap bits of 1, 2, 4 bit packed pixel formats */ | ||
1632 | if (transforms & PNG_TRANSFORM_PACKSWAP) | ||
1633 | png_set_packswap(png_ptr); | ||
1634 | #endif | ||
1635 | |||
1636 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED | ||
1637 | /* Invert the alpha channel from opacity to transparency */ | ||
1638 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) | ||
1639 | png_set_invert_alpha(png_ptr); | ||
1640 | #endif | ||
1641 | |||
1642 | /* ----------------------- end of transformations ------------------- */ | ||
1643 | |||
1644 | /* Write the bits */ | ||
1645 | if (info_ptr->valid & PNG_INFO_IDAT) | ||
1646 | png_write_image(png_ptr, info_ptr->row_pointers); | ||
1647 | |||
1648 | /* It is REQUIRED to call this to finish writing the rest of the file */ | ||
1649 | png_write_end(png_ptr, info_ptr); | ||
1650 | |||
1651 | PNG_UNUSED(transforms) /* Quiet compiler warnings */ | ||
1652 | PNG_UNUSED(params) | ||
1653 | } | ||
1654 | #endif | ||
1655 | #endif /* PNG_WRITE_SUPPORTED */ | ||