source: trunk/src/3rdparty/libpng/pngget.c@ 689

Last change on this file since 689 was 561, checked in by Dmitry A. Kuminov, 16 years ago

trunk: Merged in qt 4.6.1 sources.
File size: 24.3 KB
Line 
1
2/* pngget.c - retrieval of values from info struct
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
15#define PNG_INTERNAL
16#include "png.h"
17#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
18
19png_uint_32 PNGAPI
20png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
21{
22 if (png_ptr != NULL && info_ptr != NULL)
23 return(info_ptr->valid & flag);
24
25 else
26 return(0);
27}
28
29png_uint_32 PNGAPI
30png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
31{
32 if (png_ptr != NULL && info_ptr != NULL)
33 return(info_ptr->rowbytes);
34
35 else
36 return(0);
37}
38
39#if defined(PNG_INFO_IMAGE_SUPPORTED)
40png_bytepp PNGAPI
41png_get_rows(png_structp png_ptr, png_infop info_ptr)
42{
43 if (png_ptr != NULL && info_ptr != NULL)
44 return(info_ptr->row_pointers);
45
46 else
47 return(0);
48}
49#endif
50
51#ifdef PNG_EASY_ACCESS_SUPPORTED
52/* Easy access to info, added in libpng-0.99 */
53png_uint_32 PNGAPI
54png_get_image_width(png_structp png_ptr, png_infop info_ptr)
55{
56 if (png_ptr != NULL && info_ptr != NULL)
57 return info_ptr->width;
58
59 return (0);
60}
61
62png_uint_32 PNGAPI
63png_get_image_height(png_structp png_ptr, png_infop info_ptr)
64{
65 if (png_ptr != NULL && info_ptr != NULL)
66 return info_ptr->height;
67
68 return (0);
69}
70
71png_byte PNGAPI
72png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
73{
74 if (png_ptr != NULL && info_ptr != NULL)
75 return info_ptr->bit_depth;
76
77 return (0);
78}
79
80png_byte PNGAPI
81png_get_color_type(png_structp png_ptr, png_infop info_ptr)
82{
83 if (png_ptr != NULL && info_ptr != NULL)
84 return info_ptr->color_type;
85
86 return (0);
87}
88
89png_byte PNGAPI
90png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
91{
92 if (png_ptr != NULL && info_ptr != NULL)
93 return info_ptr->filter_type;
94
95 return (0);
96}
97
98png_byte PNGAPI
99png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
100{
101 if (png_ptr != NULL && info_ptr != NULL)
102 return info_ptr->interlace_type;
103
104 return (0);
105}
106
107png_byte PNGAPI
108png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
109{
110 if (png_ptr != NULL && info_ptr != NULL)
111 return info_ptr->compression_type;
112
113 return (0);
114}
115
116png_uint_32 PNGAPI
117png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
118{
119 if (png_ptr != NULL && info_ptr != NULL)
120#if defined(PNG_pHYs_SUPPORTED)
121 if (info_ptr->valid & PNG_INFO_pHYs)
122 {
123 png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter");
124
125 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
126 return (0);
127
128 else
129 return (info_ptr->x_pixels_per_unit);
130 }
131#else
132 return (0);
133#endif
134 return (0);
135}
136
137png_uint_32 PNGAPI
138png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
139{
140 if (png_ptr != NULL && info_ptr != NULL)
141#if defined(PNG_pHYs_SUPPORTED)
142 if (info_ptr->valid & PNG_INFO_pHYs)
143 {
144 png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter");
145
146 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
147 return (0);
148
149 else
150 return (info_ptr->y_pixels_per_unit);
151 }
152#else
153 return (0);
154#endif
155 return (0);
156}
157
158png_uint_32 PNGAPI
159png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
160{
161 if (png_ptr != NULL && info_ptr != NULL)
162#if defined(PNG_pHYs_SUPPORTED)
163 if (info_ptr->valid & PNG_INFO_pHYs)
164 {
165 png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
166
167 if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
168 info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
169 return (0);
170
171 else
172 return (info_ptr->x_pixels_per_unit);
173 }
174#else
175 return (0);
176#endif
177 return (0);
178}
179
180#ifdef PNG_FLOATING_POINT_SUPPORTED
181float PNGAPI
182png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
183 {
184 if (png_ptr != NULL && info_ptr != NULL)
185#if defined(PNG_pHYs_SUPPORTED)
186
187 if (info_ptr->valid & PNG_INFO_pHYs)
188 {
189 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
190 if (info_ptr->x_pixels_per_unit == 0)
191 return ((float)0.0);
192 else
193 return ((float)((float)info_ptr->y_pixels_per_unit
194 /(float)info_ptr->x_pixels_per_unit));
195 }
196#else
197 return (0.0);
198#endif
199 return ((float)0.0);
200}
201#endif
202
203png_int_32 PNGAPI
204png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
205{
206 if (png_ptr != NULL && info_ptr != NULL)
207#if defined(PNG_oFFs_SUPPORTED)
208
209 if (info_ptr->valid & PNG_INFO_oFFs)
210 {
211 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
212
213 if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
214 return (0);
215
216 else
217 return (info_ptr->x_offset);
218 }
219#else
220 return (0);
221#endif
222 return (0);
223}
224
225png_int_32 PNGAPI
226png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
227{
228 if (png_ptr != NULL && info_ptr != NULL)
229
230#if defined(PNG_oFFs_SUPPORTED)
231 if (info_ptr->valid & PNG_INFO_oFFs)
232 {
233 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
234
235 if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
236 return (0);
237
238 else
239 return (info_ptr->y_offset);
240 }
241#else
242 return (0);
243#endif
244 return (0);
245}
246
247png_int_32 PNGAPI
248png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
249{
250 if (png_ptr != NULL && info_ptr != NULL)
251
252#if defined(PNG_oFFs_SUPPORTED)
253 if (info_ptr->valid & PNG_INFO_oFFs)
254 {
255 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
256
257 if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
258 return (0);
259
260 else
261 return (info_ptr->x_offset);
262 }
263#else
264 return (0);
265#endif
266 return (0);
267}
268
269png_int_32 PNGAPI
270png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
271{
272 if (png_ptr != NULL && info_ptr != NULL)
273
274#if defined(PNG_oFFs_SUPPORTED)
275 if (info_ptr->valid & PNG_INFO_oFFs)
276 {
277 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
278
279 if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
280 return (0);
281
282 else
283 return (info_ptr->y_offset);
284 }
285#else
286 return (0);
287#endif
288 return (0);
289}
290
291#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
292png_uint_32 PNGAPI
293png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
294{
295 return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
296 *.0254 +.5));
297}
298
299png_uint_32 PNGAPI
300png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
301{
302 return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
303 *.0254 +.5));
304}
305
306png_uint_32 PNGAPI
307png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
308{
309 return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
310 *.0254 +.5));
311}
312
313float PNGAPI
314png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
315{
316 return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
317 *.00003937);
318}
319
320float PNGAPI
321png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
322{
323 return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
324 *.00003937);
325}
326
327#if defined(PNG_pHYs_SUPPORTED)
328png_uint_32 PNGAPI
329png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
330 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
331{
332 png_uint_32 retval = 0;
333
334 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
335 {
336 png_debug1(1, "in %s retrieval function", "pHYs");
337 if (res_x != NULL)
338 {
339 *res_x = info_ptr->x_pixels_per_unit;
340 retval |= PNG_INFO_pHYs;
341 }
342 if (res_y != NULL)
343 {
344 *res_y = info_ptr->y_pixels_per_unit;
345 retval |= PNG_INFO_pHYs;
346 }
347 if (unit_type != NULL)
348 {
349 *unit_type = (int)info_ptr->phys_unit_type;
350 retval |= PNG_INFO_pHYs;
351 if (*unit_type == 1)
352 {
353 if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
354 if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
355 }
356 }
357 }
358 return (retval);
359}
360#endif /* PNG_pHYs_SUPPORTED */
361#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
362
363/* png_get_channels really belongs in here, too, but it's been around longer */
364
365#endif /* PNG_EASY_ACCESS_SUPPORTED */
366
367png_byte PNGAPI
368png_get_channels(png_structp png_ptr, png_infop info_ptr)
369{
370 if (png_ptr != NULL && info_ptr != NULL)
371 return(info_ptr->channels);
372 else
373 return (0);
374}
375
376png_bytep PNGAPI
377png_get_signature(png_structp png_ptr, png_infop info_ptr)
378{
379 if (png_ptr != NULL && info_ptr != NULL)
380 return(info_ptr->signature);
381 else
382 return (NULL);
383}
384
385#if defined(PNG_bKGD_SUPPORTED)
386png_uint_32 PNGAPI
387png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
388 png_color_16p *background)
389{
390 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
391 && background != NULL)
392 {
393 png_debug1(1, "in %s retrieval function", "bKGD");
394 *background = &(info_ptr->background);
395 return (PNG_INFO_bKGD);
396 }
397 return (0);
398}
399#endif
400
401#if defined(PNG_cHRM_SUPPORTED)
402#ifdef PNG_FLOATING_POINT_SUPPORTED
403png_uint_32 PNGAPI
404png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
405 double *white_x, double *white_y, double *red_x, double *red_y,
406 double *green_x, double *green_y, double *blue_x, double *blue_y)
407{
408 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
409 {
410 png_debug1(1, "in %s retrieval function", "cHRM");
411 if (white_x != NULL)
412 *white_x = (double)info_ptr->x_white;
413 if (white_y != NULL)
414 *white_y = (double)info_ptr->y_white;
415 if (red_x != NULL)
416 *red_x = (double)info_ptr->x_red;
417 if (red_y != NULL)
418 *red_y = (double)info_ptr->y_red;
419 if (green_x != NULL)
420 *green_x = (double)info_ptr->x_green;
421 if (green_y != NULL)
422 *green_y = (double)info_ptr->y_green;
423 if (blue_x != NULL)
424 *blue_x = (double)info_ptr->x_blue;
425 if (blue_y != NULL)
426 *blue_y = (double)info_ptr->y_blue;
427 return (PNG_INFO_cHRM);
428 }
429 return (0);
430}
431#endif
432#ifdef PNG_FIXED_POINT_SUPPORTED
433png_uint_32 PNGAPI
434png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
435 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
436 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
437 png_fixed_point *blue_x, png_fixed_point *blue_y)
438{
439 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
440 {
441 png_debug1(1, "in %s retrieval function", "cHRM");
442 if (white_x != NULL)
443 *white_x = info_ptr->int_x_white;
444 if (white_y != NULL)
445 *white_y = info_ptr->int_y_white;
446 if (red_x != NULL)
447 *red_x = info_ptr->int_x_red;
448 if (red_y != NULL)
449 *red_y = info_ptr->int_y_red;
450 if (green_x != NULL)
451 *green_x = info_ptr->int_x_green;
452 if (green_y != NULL)
453 *green_y = info_ptr->int_y_green;
454 if (blue_x != NULL)
455 *blue_x = info_ptr->int_x_blue;
456 if (blue_y != NULL)
457 *blue_y = info_ptr->int_y_blue;
458 return (PNG_INFO_cHRM);
459 }
460 return (0);
461}
462#endif
463#endif
464
465#if defined(PNG_gAMA_SUPPORTED)
466#ifdef PNG_FLOATING_POINT_SUPPORTED
467png_uint_32 PNGAPI
468png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
469{
470 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
471 && file_gamma != NULL)
472 {
473 png_debug1(1, "in %s retrieval function", "gAMA");
474 *file_gamma = (double)info_ptr->gamma;
475 return (PNG_INFO_gAMA);
476 }
477 return (0);
478}
479#endif
480#ifdef PNG_FIXED_POINT_SUPPORTED
481png_uint_32 PNGAPI
482png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
483 png_fixed_point *int_file_gamma)
484{
485 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
486 && int_file_gamma != NULL)
487 {
488 png_debug1(1, "in %s retrieval function", "gAMA");
489 *int_file_gamma = info_ptr->int_gamma;
490 return (PNG_INFO_gAMA);
491 }
492 return (0);
493}
494#endif
495#endif
496
497#if defined(PNG_sRGB_SUPPORTED)
498png_uint_32 PNGAPI
499png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
500{
501 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
502 && file_srgb_intent != NULL)
503 {
504 png_debug1(1, "in %s retrieval function", "sRGB");
505 *file_srgb_intent = (int)info_ptr->srgb_intent;
506 return (PNG_INFO_sRGB);
507 }
508 return (0);
509}
510#endif
511
512#if defined(PNG_iCCP_SUPPORTED)
513png_uint_32 PNGAPI
514png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
515 png_charpp name, int *compression_type,
516 png_charpp profile, png_uint_32 *proflen)
517{
518 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
519 && name != NULL && profile != NULL && proflen != NULL)
520 {
521 png_debug1(1, "in %s retrieval function", "iCCP");
522 *name = info_ptr->iccp_name;
523 *profile = info_ptr->iccp_profile;
524 /* Compression_type is a dummy so the API won't have to change
525 * if we introduce multiple compression types later.
526 */
527 *proflen = (int)info_ptr->iccp_proflen;
528 *compression_type = (int)info_ptr->iccp_compression;
529 return (PNG_INFO_iCCP);
530 }
531 return (0);
532}
533#endif
534
535#if defined(PNG_sPLT_SUPPORTED)
536png_uint_32 PNGAPI
537png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
538 png_sPLT_tpp spalettes)
539{
540 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
541 {
542 *spalettes = info_ptr->splt_palettes;
543 return ((png_uint_32)info_ptr->splt_palettes_num);
544 }
545 return (0);
546}
547#endif
548
549#if defined(PNG_hIST_SUPPORTED)
550png_uint_32 PNGAPI
551png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
552{
553 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
554 && hist != NULL)
555 {
556 png_debug1(1, "in %s retrieval function", "hIST");
557 *hist = info_ptr->hist;
558 return (PNG_INFO_hIST);
559 }
560 return (0);
561}
562#endif
563
564png_uint_32 PNGAPI
565png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
566 png_uint_32 *width, png_uint_32 *height, int *bit_depth,
567 int *color_type, int *interlace_type, int *compression_type,
568 int *filter_type)
569
570{
571 if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
572 bit_depth != NULL && color_type != NULL)
573 {
574 png_debug1(1, "in %s retrieval function", "IHDR");
575 *width = info_ptr->width;
576 *height = info_ptr->height;
577 *bit_depth = info_ptr->bit_depth;
578 if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
579 png_error(png_ptr, "Invalid bit depth");
580
581 *color_type = info_ptr->color_type;
582
583 if (info_ptr->color_type > 6)
584 png_error(png_ptr, "Invalid color type");
585
586 if (compression_type != NULL)
587 *compression_type = info_ptr->compression_type;
588
589 if (filter_type != NULL)
590 *filter_type = info_ptr->filter_type;
591
592 if (interlace_type != NULL)
593 *interlace_type = info_ptr->interlace_type;
594
595 /* Check for potential overflow of rowbytes */
596 if (*width == 0 || *width > PNG_UINT_31_MAX)
597 png_error(png_ptr, "Invalid image width");
598
599 if (*height == 0 || *height > PNG_UINT_31_MAX)
600 png_error(png_ptr, "Invalid image height");
601
602 if (info_ptr->width > (PNG_UINT_32_MAX
603 >> 3) /* 8-byte RGBA pixels */
604 - 64 /* bigrowbuf hack */
605 - 1 /* filter byte */
606 - 7*8 /* rounding of width to multiple of 8 pixels */
607 - 8) /* extra max_pixel_depth pad */
608 {
609 png_warning(png_ptr,
610 "Width too large for libpng to process image data.");
611 }
612
613 return (1);
614 }
615 return (0);
616}
617
618#if defined(PNG_oFFs_SUPPORTED)
619png_uint_32 PNGAPI
620png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
621 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
622{
623 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
624 && offset_x != NULL && offset_y != NULL && unit_type != NULL)
625 {
626 png_debug1(1, "in %s retrieval function", "oFFs");
627 *offset_x = info_ptr->x_offset;
628 *offset_y = info_ptr->y_offset;
629 *unit_type = (int)info_ptr->offset_unit_type;
630 return (PNG_INFO_oFFs);
631 }
632 return (0);
633}
634#endif
635
636#if defined(PNG_pCAL_SUPPORTED)
637png_uint_32 PNGAPI
638png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
639 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
640 png_charp *units, png_charpp *params)
641{
642 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
643 && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
644 nparams != NULL && units != NULL && params != NULL)
645 {
646 png_debug1(1, "in %s retrieval function", "pCAL");
647 *purpose = info_ptr->pcal_purpose;
648 *X0 = info_ptr->pcal_X0;
649 *X1 = info_ptr->pcal_X1;
650 *type = (int)info_ptr->pcal_type;
651 *nparams = (int)info_ptr->pcal_nparams;
652 *units = info_ptr->pcal_units;
653 *params = info_ptr->pcal_params;
654 return (PNG_INFO_pCAL);
655 }
656 return (0);
657}
658#endif
659
660#if defined(PNG_sCAL_SUPPORTED)
661#ifdef PNG_FLOATING_POINT_SUPPORTED
662png_uint_32 PNGAPI
663png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
664 int *unit, double *width, double *height)
665{
666 if (png_ptr != NULL && info_ptr != NULL &&
667 (info_ptr->valid & PNG_INFO_sCAL))
668 {
669 *unit = info_ptr->scal_unit;
670 *width = info_ptr->scal_pixel_width;
671 *height = info_ptr->scal_pixel_height;
672 return (PNG_INFO_sCAL);
673 }
674 return(0);
675}
676#else
677#ifdef PNG_FIXED_POINT_SUPPORTED
678png_uint_32 PNGAPI
679png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
680 int *unit, png_charpp width, png_charpp height)
681{
682 if (png_ptr != NULL && info_ptr != NULL &&
683 (info_ptr->valid & PNG_INFO_sCAL))
684 {
685 *unit = info_ptr->scal_unit;
686 *width = info_ptr->scal_s_width;
687 *height = info_ptr->scal_s_height;
688 return (PNG_INFO_sCAL);
689 }
690 return(0);
691}
692#endif
693#endif
694#endif
695
696#if defined(PNG_pHYs_SUPPORTED)
697png_uint_32 PNGAPI
698png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
699 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
700{
701 png_uint_32 retval = 0;
702
703 if (png_ptr != NULL && info_ptr != NULL &&
704 (info_ptr->valid & PNG_INFO_pHYs))
705 {
706 png_debug1(1, "in %s retrieval function", "pHYs");
707
708 if (res_x != NULL)
709 {
710 *res_x = info_ptr->x_pixels_per_unit;
711 retval |= PNG_INFO_pHYs;
712 }
713
714 if (res_y != NULL)
715 {
716 *res_y = info_ptr->y_pixels_per_unit;
717 retval |= PNG_INFO_pHYs;
718 }
719
720 if (unit_type != NULL)
721 {
722 *unit_type = (int)info_ptr->phys_unit_type;
723 retval |= PNG_INFO_pHYs;
724 }
725 }
726 return (retval);
727}
728#endif
729
730png_uint_32 PNGAPI
731png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
732 int *num_palette)
733{
734 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
735 && palette != NULL)
736 {
737 png_debug1(1, "in %s retrieval function", "PLTE");
738 *palette = info_ptr->palette;
739 *num_palette = info_ptr->num_palette;
740 png_debug1(3, "num_palette = %d", *num_palette);
741 return (PNG_INFO_PLTE);
742 }
743 return (0);
744}
745
746#if defined(PNG_sBIT_SUPPORTED)
747png_uint_32 PNGAPI
748png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
749{
750 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
751 && sig_bit != NULL)
752 {
753 png_debug1(1, "in %s retrieval function", "sBIT");
754 *sig_bit = &(info_ptr->sig_bit);
755 return (PNG_INFO_sBIT);
756 }
757 return (0);
758}
759#endif
760
761#if defined(PNG_TEXT_SUPPORTED)
762png_uint_32 PNGAPI
763png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
764 int *num_text)
765{
766 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
767 {
768 png_debug1(1, "in %s retrieval function",
769 (png_ptr->chunk_name[0] == '\0' ? "text"
770 : (png_const_charp)png_ptr->chunk_name));
771
772 if (text_ptr != NULL)
773 *text_ptr = info_ptr->text;
774
775 if (num_text != NULL)
776 *num_text = info_ptr->num_text;
777
778 return ((png_uint_32)info_ptr->num_text);
779 }
780 if (num_text != NULL)
781 *num_text = 0;
782 return(0);
783}
784#endif
785
786#if defined(PNG_tIME_SUPPORTED)
787png_uint_32 PNGAPI
788png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
789{
790 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
791 && mod_time != NULL)
792 {
793 png_debug1(1, "in %s retrieval function", "tIME");
794 *mod_time = &(info_ptr->mod_time);
795 return (PNG_INFO_tIME);
796 }
797 return (0);
798}
799#endif
800
801#if defined(PNG_tRNS_SUPPORTED)
802png_uint_32 PNGAPI
803png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
804 png_bytep *trans, int *num_trans, png_color_16p *trans_values)
805{
806 png_uint_32 retval = 0;
807 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
808 {
809 png_debug1(1, "in %s retrieval function", "tRNS");
810 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
811 {
812 if (trans != NULL)
813 {
814 *trans = info_ptr->trans;
815 retval |= PNG_INFO_tRNS;
816 }
817
818 if (trans_values != NULL)
819 *trans_values = &(info_ptr->trans_values);
820 }
821 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
822 {
823 if (trans_values != NULL)
824 {
825 *trans_values = &(info_ptr->trans_values);
826 retval |= PNG_INFO_tRNS;
827 }
828
829 if (trans != NULL)
830 *trans = NULL;
831 }
832 if (num_trans != NULL)
833 {
834 *num_trans = info_ptr->num_trans;
835 retval |= PNG_INFO_tRNS;
836 }
837 }
838 return (retval);
839}
840#endif
841
842#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
843png_uint_32 PNGAPI
844png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
845 png_unknown_chunkpp unknowns)
846{
847 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
848 {
849 *unknowns = info_ptr->unknown_chunks;
850 return ((png_uint_32)info_ptr->unknown_chunks_num);
851 }
852 return (0);
853}
854#endif
855
856#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
857png_byte PNGAPI
858png_get_rgb_to_gray_status (png_structp png_ptr)
859{
860 return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
861}
862#endif
863
864#if defined(PNG_USER_CHUNKS_SUPPORTED)
865png_voidp PNGAPI
866png_get_user_chunk_ptr(png_structp png_ptr)
867{
868 return (png_ptr? png_ptr->user_chunk_ptr : NULL);
869}
870#endif
871
872#ifdef PNG_WRITE_SUPPORTED
873png_uint_32 PNGAPI
874png_get_compression_buffer_size(png_structp png_ptr)
875{
876 return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
877}
878#endif
879
880#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
881#ifndef PNG_1_0_X
882/* This function was added to libpng 1.2.0 and should exist by default */
883png_uint_32 PNGAPI
884png_get_asm_flags (png_structp png_ptr)
885{
886 /* Obsolete, to be removed from libpng-1.4.0 */
887 return (png_ptr? 0L: 0L);
888}
889
890/* This function was added to libpng 1.2.0 and should exist by default */
891png_uint_32 PNGAPI
892png_get_asm_flagmask (int flag_select)
893{
894 /* Obsolete, to be removed from libpng-1.4.0 */
895 flag_select=flag_select;
896 return 0L;
897}
898
899 /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
900/* This function was added to libpng 1.2.0 */
901png_uint_32 PNGAPI
902png_get_mmx_flagmask (int flag_select, int *compilerID)
903{
904 /* Obsolete, to be removed from libpng-1.4.0 */
905 flag_select=flag_select;
906 *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */
907 return 0L;
908}
909
910/* This function was added to libpng 1.2.0 */
911png_byte PNGAPI
912png_get_mmx_bitdepth_threshold (png_structp png_ptr)
913{
914 /* Obsolete, to be removed from libpng-1.4.0 */
915 return (png_ptr? 0: 0);
916}
917
918/* This function was added to libpng 1.2.0 */
919png_uint_32 PNGAPI
920png_get_mmx_rowbytes_threshold (png_structp png_ptr)
921{
922 /* Obsolete, to be removed from libpng-1.4.0 */
923 return (png_ptr? 0L: 0L);
924}
925#endif /* ?PNG_1_0_X */
926#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
927
928#ifdef PNG_SET_USER_LIMITS_SUPPORTED
929/* These functions were added to libpng 1.2.6 */
930png_uint_32 PNGAPI
931png_get_user_width_max (png_structp png_ptr)
932{
933 return (png_ptr? png_ptr->user_width_max : 0);
934}
935png_uint_32 PNGAPI
936png_get_user_height_max (png_structp png_ptr)
937{
938 return (png_ptr? png_ptr->user_height_max : 0);
939}
940#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
941
942
943#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
Note: See TracBrowser for help on using the repository browser.