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Improve check for OS X version in Cocoa wxFileDialog implementation.
[wxWidgets.git] / src / png / pngget.c
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1
2/* pngget.c - retrieval of values from info struct
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
15#include "pngpriv.h"
16
17#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
18
19png_uint_32 PNGAPI
20png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr,
21 png_uint_32 flag)
22{
23 if (png_ptr != NULL && info_ptr != NULL)
24 return(info_ptr->valid & flag);
25
26 return(0);
27}
28
29png_size_t PNGAPI
30png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)
31{
32 if (png_ptr != NULL && info_ptr != NULL)
33 return(info_ptr->rowbytes);
34
35 return(0);
36}
37
38#ifdef PNG_INFO_IMAGE_SUPPORTED
39png_bytepp PNGAPI
40png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr)
41{
42 if (png_ptr != NULL && info_ptr != NULL)
43 return(info_ptr->row_pointers);
44
45 return(0);
46}
47#endif
48
49#ifdef PNG_EASY_ACCESS_SUPPORTED
50/* Easy access to info, added in libpng-0.99 */
51png_uint_32 PNGAPI
52png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr)
53{
54 if (png_ptr != NULL && info_ptr != NULL)
55 return info_ptr->width;
56
57 return (0);
58}
59
60png_uint_32 PNGAPI
61png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr)
62{
63 if (png_ptr != NULL && info_ptr != NULL)
64 return info_ptr->height;
65
66 return (0);
67}
68
69png_byte PNGAPI
70png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr)
71{
72 if (png_ptr != NULL && info_ptr != NULL)
73 return info_ptr->bit_depth;
74
75 return (0);
76}
77
78png_byte PNGAPI
79png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr)
80{
81 if (png_ptr != NULL && info_ptr != NULL)
82 return info_ptr->color_type;
83
84 return (0);
85}
86
87png_byte PNGAPI
88png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr)
89{
90 if (png_ptr != NULL && info_ptr != NULL)
91 return info_ptr->filter_type;
92
93 return (0);
94}
95
96png_byte PNGAPI
97png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr)
98{
99 if (png_ptr != NULL && info_ptr != NULL)
100 return info_ptr->interlace_type;
101
102 return (0);
103}
104
105png_byte PNGAPI
106png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr)
107{
108 if (png_ptr != NULL && info_ptr != NULL)
109 return info_ptr->compression_type;
110
111 return (0);
112}
113
114png_uint_32 PNGAPI
115png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
116{
117#ifdef PNG_pHYs_SUPPORTED
118 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
119 {
120 png_debug1(1, "in %s retrieval function",
121 "png_get_x_pixels_per_meter");
122
123 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
124 return (info_ptr->x_pixels_per_unit);
125 }
126#endif
127
128 return (0);
129}
130
131png_uint_32 PNGAPI
132png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
133{
134#ifdef PNG_pHYs_SUPPORTED
135 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
136 {
137 png_debug1(1, "in %s retrieval function",
138 "png_get_y_pixels_per_meter");
139
140 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
141 return (info_ptr->y_pixels_per_unit);
142 }
143#endif
144
145 return (0);
146}
147
148png_uint_32 PNGAPI
149png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
150{
151#ifdef PNG_pHYs_SUPPORTED
152 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
153 {
154 png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
155
156 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
157 info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
158 return (info_ptr->x_pixels_per_unit);
159 }
160#endif
161
162 return (0);
163}
164
165#ifdef PNG_FLOATING_POINT_SUPPORTED
166float PNGAPI
167png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr)
168{
169#ifdef PNG_READ_pHYs_SUPPORTED
170 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
171 {
172 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
173
174 if (info_ptr->x_pixels_per_unit != 0)
175 return ((float)((float)info_ptr->y_pixels_per_unit
176 /(float)info_ptr->x_pixels_per_unit));
177 }
178#endif
179
180 return ((float)0.0);
181}
182#endif
183
184#ifdef PNG_FIXED_POINT_SUPPORTED
185png_fixed_point PNGAPI
186png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,
187 png_const_infop info_ptr)
188{
189#ifdef PNG_READ_pHYs_SUPPORTED
190 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
191 && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0
192 && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX
193 && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
194 {
195 png_fixed_point res;
196
197 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
198
199 /* The following casts work because a PNG 4 byte integer only has a valid
200 * range of 0..2^31-1; otherwise the cast might overflow.
201 */
202 if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
203 (png_int_32)info_ptr->x_pixels_per_unit))
204 return res;
205 }
206#endif
207
208 return 0;
209}
210#endif
211
212png_int_32 PNGAPI
213png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
214{
215#ifdef PNG_oFFs_SUPPORTED
216 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
217 {
218 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
219
220 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
221 return (info_ptr->x_offset);
222 }
223#endif
224
225 return (0);
226}
227
228png_int_32 PNGAPI
229png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
230{
231#ifdef PNG_oFFs_SUPPORTED
232 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
233 {
234 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
235
236 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
237 return (info_ptr->y_offset);
238 }
239#endif
240
241 return (0);
242}
243
244png_int_32 PNGAPI
245png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
246{
247#ifdef PNG_oFFs_SUPPORTED
248 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
249 {
250 png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
251
252 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
253 return (info_ptr->x_offset);
254 }
255#endif
256
257 return (0);
258}
259
260png_int_32 PNGAPI
261png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
262{
263#ifdef PNG_oFFs_SUPPORTED
264 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
265 {
266 png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
267
268 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
269 return (info_ptr->y_offset);
270 }
271#endif
272
273 return (0);
274}
275
276#ifdef PNG_INCH_CONVERSIONS_SUPPORTED
277static png_uint_32
278ppi_from_ppm(png_uint_32 ppm)
279{
280#if 0
281 /* The conversion is *(2.54/100), in binary (32 digits):
282 * .00000110100000001001110101001001
283 */
284 png_uint_32 t1001, t1101;
285 ppm >>= 1; /* .1 */
286 t1001 = ppm + (ppm >> 3); /* .1001 */
287 t1101 = t1001 + (ppm >> 1); /* .1101 */
288 ppm >>= 20; /* .000000000000000000001 */
289 t1101 += t1101 >> 15; /* .1101000000000001101 */
290 t1001 >>= 11; /* .000000000001001 */
291 t1001 += t1001 >> 12; /* .000000000001001000000001001 */
292 ppm += t1001; /* .000000000001001000001001001 */
293 ppm += t1101; /* .110100000001001110101001001 */
294 return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
295#else
296 /* The argument is a PNG unsigned integer, so it is not permitted
297 * to be bigger than 2^31.
298 */
299 png_fixed_point result;
300 if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
301 5000))
302 return result;
303
304 /* Overflow. */
305 return 0;
306#endif
307}
308
309png_uint_32 PNGAPI
310png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
311{
312 return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
313}
314
315png_uint_32 PNGAPI
316png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
317{
318 return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
319}
320
321png_uint_32 PNGAPI
322png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
323{
324 return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
325}
326
327#ifdef PNG_FIXED_POINT_SUPPORTED
328static png_fixed_point
329png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns)
330{
331 /* Convert from metres * 1,000,000 to inches * 100,000, meters to
332 * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
333 * Notice that this can overflow - a warning is output and 0 is
334 * returned.
335 */
336 return png_muldiv_warn(png_ptr, microns, 500, 127);
337}
338
339png_fixed_point PNGAPI
340png_get_x_offset_inches_fixed(png_structp png_ptr,
341 png_const_infop info_ptr)
342{
343 return png_fixed_inches_from_microns(png_ptr,
344 png_get_x_offset_microns(png_ptr, info_ptr));
345}
346#endif
347
348#ifdef PNG_FIXED_POINT_SUPPORTED
349png_fixed_point PNGAPI
350png_get_y_offset_inches_fixed(png_structp png_ptr,
351 png_const_infop info_ptr)
352{
353 return png_fixed_inches_from_microns(png_ptr,
354 png_get_y_offset_microns(png_ptr, info_ptr));
355}
356#endif
357
358#ifdef PNG_FLOATING_POINT_SUPPORTED
359float PNGAPI
360png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
361{
362 /* To avoid the overflow do the conversion directly in floating
363 * point.
364 */
365 return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
366}
367#endif
368
369#ifdef PNG_FLOATING_POINT_SUPPORTED
370float PNGAPI
371png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
372{
373 /* To avoid the overflow do the conversion directly in floating
374 * point.
375 */
376 return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
377}
378#endif
379
380#ifdef PNG_pHYs_SUPPORTED
381png_uint_32 PNGAPI
382png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr,
383 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
384{
385 png_uint_32 retval = 0;
386
387 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
388 {
389 png_debug1(1, "in %s retrieval function", "pHYs");
390
391 if (res_x != NULL)
392 {
393 *res_x = info_ptr->x_pixels_per_unit;
394 retval |= PNG_INFO_pHYs;
395 }
396
397 if (res_y != NULL)
398 {
399 *res_y = info_ptr->y_pixels_per_unit;
400 retval |= PNG_INFO_pHYs;
401 }
402
403 if (unit_type != NULL)
404 {
405 *unit_type = (int)info_ptr->phys_unit_type;
406 retval |= PNG_INFO_pHYs;
407
408 if (*unit_type == 1)
409 {
410 if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
411 if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
412 }
413 }
414 }
415
416 return (retval);
417}
418#endif /* PNG_pHYs_SUPPORTED */
419#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */
420
421/* png_get_channels really belongs in here, too, but it's been around longer */
422
423#endif /* PNG_EASY_ACCESS_SUPPORTED */
424
425png_byte PNGAPI
426png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr)
427{
428 if (png_ptr != NULL && info_ptr != NULL)
429 return(info_ptr->channels);
430
431 return (0);
432}
433
434png_const_bytep PNGAPI
435png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
436{
437 if (png_ptr != NULL && info_ptr != NULL)
438 return(info_ptr->signature);
439
440 return (NULL);
441}
442
443#ifdef PNG_bKGD_SUPPORTED
444png_uint_32 PNGAPI
445png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr,
446 png_color_16p *background)
447{
448 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
449 && background != NULL)
450 {
451 png_debug1(1, "in %s retrieval function", "bKGD");
452
453 *background = &(info_ptr->background);
454 return (PNG_INFO_bKGD);
455 }
456
457 return (0);
458}
459#endif
460
461#ifdef PNG_cHRM_SUPPORTED
462/* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
463 * same time to correct the rgb grayscale coefficient defaults obtained from the
464 * cHRM chunk in 1.5.4
465 */
466png_uint_32 PNGFAPI
467png_get_cHRM_XYZ_fixed(png_structp png_ptr, png_const_infop info_ptr,
468 png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
469 png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
470 png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
471 png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
472 png_fixed_point *int_blue_Z)
473{
474 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
475 {
476 png_xy xy;
477 png_XYZ XYZ;
478
479 png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
480
481 xy.whitex = info_ptr->x_white;
482 xy.whitey = info_ptr->y_white;
483 xy.redx = info_ptr->x_red;
484 xy.redy = info_ptr->y_red;
485 xy.greenx = info_ptr->x_green;
486 xy.greeny = info_ptr->y_green;
487 xy.bluex = info_ptr->x_blue;
488 xy.bluey = info_ptr->y_blue;
489
490 /* The *_checked function handles error reporting, so just return 0 if
491 * there is a failure here.
492 */
493 if (png_XYZ_from_xy_checked(png_ptr, &XYZ, xy))
494 {
495 if (int_red_X != NULL)
496 *int_red_X = XYZ.redX;
497 if (int_red_Y != NULL)
498 *int_red_Y = XYZ.redY;
499 if (int_red_Z != NULL)
500 *int_red_Z = XYZ.redZ;
501 if (int_green_X != NULL)
502 *int_green_X = XYZ.greenX;
503 if (int_green_Y != NULL)
504 *int_green_Y = XYZ.greenY;
505 if (int_green_Z != NULL)
506 *int_green_Z = XYZ.greenZ;
507 if (int_blue_X != NULL)
508 *int_blue_X = XYZ.blueX;
509 if (int_blue_Y != NULL)
510 *int_blue_Y = XYZ.blueY;
511 if (int_blue_Z != NULL)
512 *int_blue_Z = XYZ.blueZ;
513
514 return (PNG_INFO_cHRM);
515 }
516 }
517
518 return (0);
519}
520
521# ifdef PNG_FLOATING_POINT_SUPPORTED
522png_uint_32 PNGAPI
523png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr,
524 double *white_x, double *white_y, double *red_x, double *red_y,
525 double *green_x, double *green_y, double *blue_x, double *blue_y)
526{
527 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
528 {
529 png_debug1(1, "in %s retrieval function", "cHRM");
530
531 if (white_x != NULL)
532 *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X");
533 if (white_y != NULL)
534 *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y");
535 if (red_x != NULL)
536 *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X");
537 if (red_y != NULL)
538 *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y");
539 if (green_x != NULL)
540 *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X");
541 if (green_y != NULL)
542 *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y");
543 if (blue_x != NULL)
544 *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X");
545 if (blue_y != NULL)
546 *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y");
547 return (PNG_INFO_cHRM);
548 }
549
550 return (0);
551}
552
553png_uint_32 PNGAPI
554png_get_cHRM_XYZ(png_structp png_ptr, png_const_infop info_ptr,
555 double *red_X, double *red_Y, double *red_Z, double *green_X,
556 double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
557 double *blue_Z)
558{
559 png_XYZ XYZ;
560
561 if (png_get_cHRM_XYZ_fixed(png_ptr, info_ptr,
562 &XYZ.redX, &XYZ.redY, &XYZ.redZ, &XYZ.greenX, &XYZ.greenY, &XYZ.greenZ,
563 &XYZ.blueX, &XYZ.blueY, &XYZ.blueZ) & PNG_INFO_cHRM)
564 {
565 if (red_X != NULL)
566 *red_X = png_float(png_ptr, XYZ.redX, "cHRM red X");
567 if (red_Y != NULL)
568 *red_Y = png_float(png_ptr, XYZ.redY, "cHRM red Y");
569 if (red_Z != NULL)
570 *red_Z = png_float(png_ptr, XYZ.redZ, "cHRM red Z");
571 if (green_X != NULL)
572 *green_X = png_float(png_ptr, XYZ.greenX, "cHRM green X");
573 if (green_Y != NULL)
574 *green_Y = png_float(png_ptr, XYZ.greenY, "cHRM green Y");
575 if (green_Z != NULL)
576 *green_Z = png_float(png_ptr, XYZ.greenZ, "cHRM green Z");
577 if (blue_X != NULL)
578 *blue_X = png_float(png_ptr, XYZ.blueX, "cHRM blue X");
579 if (blue_Y != NULL)
580 *blue_Y = png_float(png_ptr, XYZ.blueY, "cHRM blue Y");
581 if (blue_Z != NULL)
582 *blue_Z = png_float(png_ptr, XYZ.blueZ, "cHRM blue Z");
583 return (PNG_INFO_cHRM);
584 }
585
586 return (0);
587}
588# endif
589
590# ifdef PNG_FIXED_POINT_SUPPORTED
591png_uint_32 PNGAPI
592png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
593 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
594 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
595 png_fixed_point *blue_x, png_fixed_point *blue_y)
596{
597 png_debug1(1, "in %s retrieval function", "cHRM");
598
599 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
600 {
601 if (white_x != NULL)
602 *white_x = info_ptr->x_white;
603 if (white_y != NULL)
604 *white_y = info_ptr->y_white;
605 if (red_x != NULL)
606 *red_x = info_ptr->x_red;
607 if (red_y != NULL)
608 *red_y = info_ptr->y_red;
609 if (green_x != NULL)
610 *green_x = info_ptr->x_green;
611 if (green_y != NULL)
612 *green_y = info_ptr->y_green;
613 if (blue_x != NULL)
614 *blue_x = info_ptr->x_blue;
615 if (blue_y != NULL)
616 *blue_y = info_ptr->y_blue;
617 return (PNG_INFO_cHRM);
618 }
619
620 return (0);
621}
622# endif
623#endif
624
625#ifdef PNG_gAMA_SUPPORTED
626png_uint_32 PNGFAPI
627png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
628 png_fixed_point *file_gamma)
629{
630 png_debug1(1, "in %s retrieval function", "gAMA");
631
632 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
633 && file_gamma != NULL)
634 {
635 *file_gamma = info_ptr->gamma;
636 return (PNG_INFO_gAMA);
637 }
638
639 return (0);
640}
641# ifdef PNG_FLOATING_POINT_SUPPORTED
642png_uint_32 PNGAPI
643png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
644 double *file_gamma)
645{
646 png_fixed_point igamma;
647 png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);
648
649 if (ok)
650 *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA");
651
652 return ok;
653}
654
655# endif
656#endif
657
658#ifdef PNG_sRGB_SUPPORTED
659png_uint_32 PNGAPI
660png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr,
661 int *file_srgb_intent)
662{
663 png_debug1(1, "in %s retrieval function", "sRGB");
664
665 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
666 && file_srgb_intent != NULL)
667 {
668 *file_srgb_intent = (int)info_ptr->srgb_intent;
669 return (PNG_INFO_sRGB);
670 }
671
672 return (0);
673}
674#endif
675
676#ifdef PNG_iCCP_SUPPORTED
677png_uint_32 PNGAPI
678png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,
679 png_charpp name, int *compression_type,
680 png_bytepp profile, png_uint_32 *proflen)
681{
682 png_debug1(1, "in %s retrieval function", "iCCP");
683
684 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
685 && name != NULL && compression_type != NULL && profile != NULL &&
686 proflen != NULL)
687 {
688 *name = info_ptr->iccp_name;
689 *profile = info_ptr->iccp_profile;
690 /* Compression_type is a dummy so the API won't have to change
691 * if we introduce multiple compression types later.
692 */
693 *proflen = info_ptr->iccp_proflen;
694 *compression_type = info_ptr->iccp_compression;
695 return (PNG_INFO_iCCP);
696 }
697
698 return (0);
699}
700#endif
701
702#ifdef PNG_sPLT_SUPPORTED
703png_uint_32 PNGAPI
704png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr,
705 png_sPLT_tpp spalettes)
706{
707 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
708 {
709 *spalettes = info_ptr->splt_palettes;
710 return ((png_uint_32)info_ptr->splt_palettes_num);
711 }
712
713 return (0);
714}
715#endif
716
717#ifdef PNG_hIST_SUPPORTED
718png_uint_32 PNGAPI
719png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr,
720 png_uint_16p *hist)
721{
722 png_debug1(1, "in %s retrieval function", "hIST");
723
724 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
725 && hist != NULL)
726 {
727 *hist = info_ptr->hist;
728 return (PNG_INFO_hIST);
729 }
730
731 return (0);
732}
733#endif
734
735png_uint_32 PNGAPI
736png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
737 png_uint_32 *width, png_uint_32 *height, int *bit_depth,
738 int *color_type, int *interlace_type, int *compression_type,
739 int *filter_type)
740
741{
742 png_debug1(1, "in %s retrieval function", "IHDR");
743
744 if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
745 height == NULL || bit_depth == NULL || color_type == NULL)
746 return (0);
747
748 *width = info_ptr->width;
749 *height = info_ptr->height;
750 *bit_depth = info_ptr->bit_depth;
751 *color_type = info_ptr->color_type;
752
753 if (compression_type != NULL)
754 *compression_type = info_ptr->compression_type;
755
756 if (filter_type != NULL)
757 *filter_type = info_ptr->filter_type;
758
759 if (interlace_type != NULL)
760 *interlace_type = info_ptr->interlace_type;
761
762 /* This is redundant if we can be sure that the info_ptr values were all
763 * assigned in png_set_IHDR(). We do the check anyhow in case an
764 * application has ignored our advice not to mess with the members
765 * of info_ptr directly.
766 */
767 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
768 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
769 info_ptr->compression_type, info_ptr->filter_type);
770
771 return (1);
772}
773
774#ifdef PNG_oFFs_SUPPORTED
775png_uint_32 PNGAPI
776png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr,
777 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
778{
779 png_debug1(1, "in %s retrieval function", "oFFs");
780
781 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
782 && offset_x != NULL && offset_y != NULL && unit_type != NULL)
783 {
784 *offset_x = info_ptr->x_offset;
785 *offset_y = info_ptr->y_offset;
786 *unit_type = (int)info_ptr->offset_unit_type;
787 return (PNG_INFO_oFFs);
788 }
789
790 return (0);
791}
792#endif
793
794#ifdef PNG_pCAL_SUPPORTED
795png_uint_32 PNGAPI
796png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr,
797 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
798 png_charp *units, png_charpp *params)
799{
800 png_debug1(1, "in %s retrieval function", "pCAL");
801
802 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
803 && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
804 nparams != NULL && units != NULL && params != NULL)
805 {
806 *purpose = info_ptr->pcal_purpose;
807 *X0 = info_ptr->pcal_X0;
808 *X1 = info_ptr->pcal_X1;
809 *type = (int)info_ptr->pcal_type;
810 *nparams = (int)info_ptr->pcal_nparams;
811 *units = info_ptr->pcal_units;
812 *params = info_ptr->pcal_params;
813 return (PNG_INFO_pCAL);
814 }
815
816 return (0);
817}
818#endif
819
820#ifdef PNG_sCAL_SUPPORTED
821# ifdef PNG_FIXED_POINT_SUPPORTED
822# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
823png_uint_32 PNGAPI
824png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr,
825 int *unit, png_fixed_point *width, png_fixed_point *height)
826{
827 if (png_ptr != NULL && info_ptr != NULL &&
828 (info_ptr->valid & PNG_INFO_sCAL))
829 {
830 *unit = info_ptr->scal_unit;
831 /*TODO: make this work without FP support */
832 *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
833 *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
834 "sCAL height");
835 return (PNG_INFO_sCAL);
836 }
837
838 return(0);
839}
840# endif /* FLOATING_ARITHMETIC */
841# endif /* FIXED_POINT */
842# ifdef PNG_FLOATING_POINT_SUPPORTED
843png_uint_32 PNGAPI
844png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr,
845 int *unit, double *width, double *height)
846{
847 if (png_ptr != NULL && info_ptr != NULL &&
848 (info_ptr->valid & PNG_INFO_sCAL))
849 {
850 *unit = info_ptr->scal_unit;
851 *width = atof(info_ptr->scal_s_width);
852 *height = atof(info_ptr->scal_s_height);
853 return (PNG_INFO_sCAL);
854 }
855
856 return(0);
857}
858# endif /* FLOATING POINT */
859png_uint_32 PNGAPI
860png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr,
861 int *unit, png_charpp width, png_charpp height)
862{
863 if (png_ptr != NULL && info_ptr != NULL &&
864 (info_ptr->valid & PNG_INFO_sCAL))
865 {
866 *unit = info_ptr->scal_unit;
867 *width = info_ptr->scal_s_width;
868 *height = info_ptr->scal_s_height;
869 return (PNG_INFO_sCAL);
870 }
871
872 return(0);
873}
874#endif /* sCAL */
875
876#ifdef PNG_pHYs_SUPPORTED
877png_uint_32 PNGAPI
878png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr,
879 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
880{
881 png_uint_32 retval = 0;
882
883 png_debug1(1, "in %s retrieval function", "pHYs");
884
885 if (png_ptr != NULL && info_ptr != NULL &&
886 (info_ptr->valid & PNG_INFO_pHYs))
887 {
888 if (res_x != NULL)
889 {
890 *res_x = info_ptr->x_pixels_per_unit;
891 retval |= PNG_INFO_pHYs;
892 }
893
894 if (res_y != NULL)
895 {
896 *res_y = info_ptr->y_pixels_per_unit;
897 retval |= PNG_INFO_pHYs;
898 }
899
900 if (unit_type != NULL)
901 {
902 *unit_type = (int)info_ptr->phys_unit_type;
903 retval |= PNG_INFO_pHYs;
904 }
905 }
906
907 return (retval);
908}
909#endif /* pHYs */
910
911png_uint_32 PNGAPI
912png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr,
913 png_colorp *palette, int *num_palette)
914{
915 png_debug1(1, "in %s retrieval function", "PLTE");
916
917 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
918 && palette != NULL)
919 {
920 *palette = info_ptr->palette;
921 *num_palette = info_ptr->num_palette;
922 png_debug1(3, "num_palette = %d", *num_palette);
923 return (PNG_INFO_PLTE);
924 }
925
926 return (0);
927}
928
929#ifdef PNG_sBIT_SUPPORTED
930png_uint_32 PNGAPI
931png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr,
932 png_color_8p *sig_bit)
933{
934 png_debug1(1, "in %s retrieval function", "sBIT");
935
936 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
937 && sig_bit != NULL)
938 {
939 *sig_bit = &(info_ptr->sig_bit);
940 return (PNG_INFO_sBIT);
941 }
942
943 return (0);
944}
945#endif
946
947#ifdef PNG_TEXT_SUPPORTED
948png_uint_32 PNGAPI
949png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
950 png_textp *text_ptr, int *num_text)
951{
952 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
953 {
954 png_debug1(1, "in 0x%lx retrieval function",
955 (unsigned long)png_ptr->chunk_name);
956
957 if (text_ptr != NULL)
958 *text_ptr = info_ptr->text;
959
960 if (num_text != NULL)
961 *num_text = info_ptr->num_text;
962
963 return ((png_uint_32)info_ptr->num_text);
964 }
965
966 if (num_text != NULL)
967 *num_text = 0;
968
969 return(0);
970}
971#endif
972
973#ifdef PNG_tIME_SUPPORTED
974png_uint_32 PNGAPI
975png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
976{
977 png_debug1(1, "in %s retrieval function", "tIME");
978
979 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
980 && mod_time != NULL)
981 {
982 *mod_time = &(info_ptr->mod_time);
983 return (PNG_INFO_tIME);
984 }
985
986 return (0);
987}
988#endif
989
990#ifdef PNG_tRNS_SUPPORTED
991png_uint_32 PNGAPI
992png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr,
993 png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
994{
995 png_uint_32 retval = 0;
996 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
997 {
998 png_debug1(1, "in %s retrieval function", "tRNS");
999
1000 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1001 {
1002 if (trans_alpha != NULL)
1003 {
1004 *trans_alpha = info_ptr->trans_alpha;
1005 retval |= PNG_INFO_tRNS;
1006 }
1007
1008 if (trans_color != NULL)
1009 *trans_color = &(info_ptr->trans_color);
1010 }
1011
1012 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
1013 {
1014 if (trans_color != NULL)
1015 {
1016 *trans_color = &(info_ptr->trans_color);
1017 retval |= PNG_INFO_tRNS;
1018 }
1019
1020 if (trans_alpha != NULL)
1021 *trans_alpha = NULL;
1022 }
1023
1024 if (num_trans != NULL)
1025 {
1026 *num_trans = info_ptr->num_trans;
1027 retval |= PNG_INFO_tRNS;
1028 }
1029 }
1030
1031 return (retval);
1032}
1033#endif
1034
1035#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1036int PNGAPI
1037png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr,
1038 png_unknown_chunkpp unknowns)
1039{
1040 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
1041 {
1042 *unknowns = info_ptr->unknown_chunks;
1043 return info_ptr->unknown_chunks_num;
1044 }
1045
1046 return (0);
1047}
1048#endif
1049
1050#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1051png_byte PNGAPI
1052png_get_rgb_to_gray_status (png_const_structp png_ptr)
1053{
1054 return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
1055}
1056#endif
1057
1058#ifdef PNG_USER_CHUNKS_SUPPORTED
1059png_voidp PNGAPI
1060png_get_user_chunk_ptr(png_const_structp png_ptr)
1061{
1062 return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
1063}
1064#endif
1065
1066png_size_t PNGAPI
1067png_get_compression_buffer_size(png_const_structp png_ptr)
1068{
1069 return (png_ptr ? png_ptr->zbuf_size : 0);
1070}
1071
1072#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1073/* These functions were added to libpng 1.2.6 and were enabled
1074 * by default in libpng-1.4.0 */
1075png_uint_32 PNGAPI
1076png_get_user_width_max (png_const_structp png_ptr)
1077{
1078 return (png_ptr ? png_ptr->user_width_max : 0);
1079}
1080
1081png_uint_32 PNGAPI
1082png_get_user_height_max (png_const_structp png_ptr)
1083{
1084 return (png_ptr ? png_ptr->user_height_max : 0);
1085}
1086
1087/* This function was added to libpng 1.4.0 */
1088png_uint_32 PNGAPI
1089png_get_chunk_cache_max (png_const_structp png_ptr)
1090{
1091 return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
1092}
1093
1094/* This function was added to libpng 1.4.1 */
1095png_alloc_size_t PNGAPI
1096png_get_chunk_malloc_max (png_const_structp png_ptr)
1097{
1098 return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1099}
1100#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1101
1102/* These functions were added to libpng 1.4.0 */
1103#ifdef PNG_IO_STATE_SUPPORTED
1104png_uint_32 PNGAPI
1105png_get_io_state (png_structp png_ptr)
1106{
1107 return png_ptr->io_state;
1108}
1109
1110png_uint_32 PNGAPI
1111png_get_io_chunk_type (png_const_structp png_ptr)
1112{
1113 return png_ptr->chunk_name;
1114}
1115
1116png_const_bytep PNGAPI
1117png_get_io_chunk_name (png_structp png_ptr)
1118{
1119 PNG_CSTRING_FROM_CHUNK(png_ptr->io_chunk_string, png_ptr->chunk_name);
1120 return png_ptr->io_chunk_string;
1121}
1122#endif /* ?PNG_IO_STATE_SUPPORTED */
1123
1124#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
wxWidgets (Impactor)