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pngget.c
Go to the documentation of this file.
1
2 /* pngget.c - retrieval of values from info struct
3 *
4 * Last changed in libpng 1.5.1 [February 3, 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
19 png_uint_32 PNGAPI
20 png_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
29 png_size_t PNGAPI
30 png_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
39 png_bytepp PNGAPI
40 png_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 */
51 png_uint_32 PNGAPI
52 png_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
60 png_uint_32 PNGAPI
61 png_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
69 png_byte PNGAPI
70 png_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
78 png_byte PNGAPI
79 png_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
87 png_byte PNGAPI
88 png_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
96 png_byte PNGAPI
97 png_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
105 png_byte PNGAPI
106 png_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
114 png_uint_32 PNGAPI
115 png_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
131 png_uint_32 PNGAPI
132 png_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
148 png_uint_32 PNGAPI
149 png_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
166 float PNGAPI
167 png_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
185 png_fixed_point PNGAPI
186 png_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
212 png_int_32 PNGAPI
213 png_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
228 png_int_32 PNGAPI
229 png_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
244 png_int_32 PNGAPI
245 png_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
260 png_int_32 PNGAPI
261 png_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
277 static png_uint_32
278 ppi_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
309 png_uint_32 PNGAPI
310 png_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
315 png_uint_32 PNGAPI
316 png_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
321 png_uint_32 PNGAPI
322 png_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
328 static png_fixed_point
329 png_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
339 png_fixed_point PNGAPI
340 png_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
349 png_fixed_point PNGAPI
350 png_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
359 float PNGAPI
360 png_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
370 float PNGAPI
371 png_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
381 png_uint_32 PNGAPI
382 png_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
425 png_byte PNGAPI
426 png_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
434 png_const_bytep PNGAPI
435 png_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
444 png_uint_32 PNGAPI
445 png_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 # ifdef PNG_FLOATING_POINT_SUPPORTED
463 png_uint_32 PNGAPI
464 png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr,
465 double *white_x, double *white_y, double *red_x, double *red_y,
466 double *green_x, double *green_y, double *blue_x, double *blue_y)
467 {
468 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
469 {
470 png_debug1(1, "in %s retrieval function", "cHRM");
471
472 if (white_x != NULL)
473 *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X");
474 if (white_y != NULL)
475 *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y");
476 if (red_x != NULL)
477 *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X");
478 if (red_y != NULL)
479 *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y");
480 if (green_x != NULL)
481 *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X");
482 if (green_y != NULL)
483 *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y");
484 if (blue_x != NULL)
485 *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X");
486 if (blue_y != NULL)
487 *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y");
488 return (PNG_INFO_cHRM);
489 }
490
491 return (0);
492 }
493 # endif
494
495 # ifdef PNG_FIXED_POINT_SUPPORTED
496 png_uint_32 PNGAPI
497 png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
498 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
499 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
500 png_fixed_point *blue_x, png_fixed_point *blue_y)
501 {
502 png_debug1(1, "in %s retrieval function", "cHRM");
503
504 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
505 {
506 if (white_x != NULL)
507 *white_x = info_ptr->x_white;
508 if (white_y != NULL)
509 *white_y = info_ptr->y_white;
510 if (red_x != NULL)
511 *red_x = info_ptr->x_red;
512 if (red_y != NULL)
513 *red_y = info_ptr->y_red;
514 if (green_x != NULL)
515 *green_x = info_ptr->x_green;
516 if (green_y != NULL)
517 *green_y = info_ptr->y_green;
518 if (blue_x != NULL)
519 *blue_x = info_ptr->x_blue;
520 if (blue_y != NULL)
521 *blue_y = info_ptr->y_blue;
522 return (PNG_INFO_cHRM);
523 }
524
525 return (0);
526 }
527 # endif
528 #endif
529
530 #ifdef PNG_gAMA_SUPPORTED
531 png_uint_32 PNGFAPI
532 png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
533 png_fixed_point *file_gamma)
534 {
535 png_debug1(1, "in %s retrieval function", "gAMA");
536
537 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
538 && file_gamma != NULL)
539 {
540 *file_gamma = info_ptr->gamma;
541 return (PNG_INFO_gAMA);
542 }
543
544 return (0);
545 }
546 # ifdef PNG_FLOATING_POINT_SUPPORTED
547 png_uint_32 PNGAPI
548 png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
549 double *file_gamma)
550 {
551 png_fixed_point igamma;
552 png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);
553
554 if (ok)
555 *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA");
556
557 return ok;
558 }
559
560 # endif
561 #endif
562
563 #ifdef PNG_sRGB_SUPPORTED
564 png_uint_32 PNGAPI
565 png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr,
566 int *file_srgb_intent)
567 {
568 png_debug1(1, "in %s retrieval function", "sRGB");
569
570 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
571 && file_srgb_intent != NULL)
572 {
573 *file_srgb_intent = (int)info_ptr->srgb_intent;
574 return (PNG_INFO_sRGB);
575 }
576
577 return (0);
578 }
579 #endif
580
581 #ifdef PNG_iCCP_SUPPORTED
582 png_uint_32 PNGAPI
583 png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,
584 png_charpp name, int *compression_type,
585 png_bytepp profile, png_uint_32 *proflen)
586 {
587 png_debug1(1, "in %s retrieval function", "iCCP");
588
589 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
590 && name != NULL && profile != NULL && proflen != NULL)
591 {
592 *name = info_ptr->iccp_name;
593 *profile = info_ptr->iccp_profile;
594 /* Compression_type is a dummy so the API won't have to change
595 * if we introduce multiple compression types later.
596 */
597 *proflen = (int)info_ptr->iccp_proflen;
598 *compression_type = (int)info_ptr->iccp_compression;
599 return (PNG_INFO_iCCP);
600 }
601
602 return (0);
603 }
604 #endif
605
606 #ifdef PNG_sPLT_SUPPORTED
607 png_uint_32 PNGAPI
608 png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr,
609 png_sPLT_tpp spalettes)
610 {
611 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
612 {
613 *spalettes = info_ptr->splt_palettes;
614 return ((png_uint_32)info_ptr->splt_palettes_num);
615 }
616
617 return (0);
618 }
619 #endif
620
621 #ifdef PNG_hIST_SUPPORTED
622 png_uint_32 PNGAPI
623 png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr,
624 png_uint_16p *hist)
625 {
626 png_debug1(1, "in %s retrieval function", "hIST");
627
628 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
629 && hist != NULL)
630 {
631 *hist = info_ptr->hist;
632 return (PNG_INFO_hIST);
633 }
634
635 return (0);
636 }
637 #endif
638
639 png_uint_32 PNGAPI
640 png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
641 png_uint_32 *width, png_uint_32 *height, int *bit_depth,
642 int *color_type, int *interlace_type, int *compression_type,
643 int *filter_type)
644
645 {
646 png_debug1(1, "in %s retrieval function", "IHDR");
647
648 if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
649 height == NULL || bit_depth == NULL || color_type == NULL)
650 return (0);
651
652 *width = info_ptr->width;
653 *height = info_ptr->height;
654 *bit_depth = info_ptr->bit_depth;
655 *color_type = info_ptr->color_type;
656
657 if (compression_type != NULL)
658 *compression_type = info_ptr->compression_type;
659
660 if (filter_type != NULL)
661 *filter_type = info_ptr->filter_type;
662
663 if (interlace_type != NULL)
664 *interlace_type = info_ptr->interlace_type;
665
666 /* This is redundant if we can be sure that the info_ptr values were all
667 * assigned in png_set_IHDR(). We do the check anyhow in case an
668 * application has ignored our advice not to mess with the members
669 * of info_ptr directly.
670 */
671 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
672 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
673 info_ptr->compression_type, info_ptr->filter_type);
674
675 return (1);
676 }
677
678 #ifdef PNG_oFFs_SUPPORTED
679 png_uint_32 PNGAPI
680 png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr,
681 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
682 {
683 png_debug1(1, "in %s retrieval function", "oFFs");
684
685 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
686 && offset_x != NULL && offset_y != NULL && unit_type != NULL)
687 {
688 *offset_x = info_ptr->x_offset;
689 *offset_y = info_ptr->y_offset;
690 *unit_type = (int)info_ptr->offset_unit_type;
691 return (PNG_INFO_oFFs);
692 }
693
694 return (0);
695 }
696 #endif
697
698 #ifdef PNG_pCAL_SUPPORTED
699 png_uint_32 PNGAPI
700 png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr,
701 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
702 png_charp *units, png_charpp *params)
703 {
704 png_debug1(1, "in %s retrieval function", "pCAL");
705
706 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
707 && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
708 nparams != NULL && units != NULL && params != NULL)
709 {
710 *purpose = info_ptr->pcal_purpose;
711 *X0 = info_ptr->pcal_X0;
712 *X1 = info_ptr->pcal_X1;
713 *type = (int)info_ptr->pcal_type;
714 *nparams = (int)info_ptr->pcal_nparams;
715 *units = info_ptr->pcal_units;
716 *params = info_ptr->pcal_params;
717 return (PNG_INFO_pCAL);
718 }
719
720 return (0);
721 }
722 #endif
723
724 #ifdef PNG_sCAL_SUPPORTED
725 # ifdef PNG_FIXED_POINT_SUPPORTED
726 # ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
727 png_uint_32 PNGAPI
728 png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr,
729 int *unit, png_fixed_point *width, png_fixed_point *height)
730 {
731 if (png_ptr != NULL && info_ptr != NULL &&
732 (info_ptr->valid & PNG_INFO_sCAL))
733 {
734 *unit = info_ptr->scal_unit;
735 /*TODO: make this work without FP support */
736 *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
737 *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
738 "sCAL height");
739 return (PNG_INFO_sCAL);
740 }
741
742 return(0);
743 }
744 # endif /* FLOATING_ARITHMETIC */
745 # endif /* FIXED_POINT */
746 # ifdef PNG_FLOATING_POINT_SUPPORTED
747 png_uint_32 PNGAPI
748 png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr,
749 int *unit, double *width, double *height)
750 {
751 if (png_ptr != NULL && info_ptr != NULL &&
752 (info_ptr->valid & PNG_INFO_sCAL))
753 {
754 *unit = info_ptr->scal_unit;
755 *width = atof(info_ptr->scal_s_width);
756 *height = atof(info_ptr->scal_s_height);
757 return (PNG_INFO_sCAL);
758 }
759
760 return(0);
761 }
762 # endif /* FLOATING POINT */
763 png_uint_32 PNGAPI
764 png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr,
765 int *unit, png_charpp width, png_charpp height)
766 {
767 if (png_ptr != NULL && info_ptr != NULL &&
768 (info_ptr->valid & PNG_INFO_sCAL))
769 {
770 *unit = info_ptr->scal_unit;
771 *width = info_ptr->scal_s_width;
772 *height = info_ptr->scal_s_height;
773 return (PNG_INFO_sCAL);
774 }
775
776 return(0);
777 }
778 #endif /* sCAL */
779
780 #ifdef PNG_pHYs_SUPPORTED
781 png_uint_32 PNGAPI
782 png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr,
783 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
784 {
785 png_uint_32 retval = 0;
786
787 png_debug1(1, "in %s retrieval function", "pHYs");
788
789 if (png_ptr != NULL && info_ptr != NULL &&
790 (info_ptr->valid & PNG_INFO_pHYs))
791 {
792 if (res_x != NULL)
793 {
794 *res_x = info_ptr->x_pixels_per_unit;
795 retval |= PNG_INFO_pHYs;
796 }
797
798 if (res_y != NULL)
799 {
800 *res_y = info_ptr->y_pixels_per_unit;
801 retval |= PNG_INFO_pHYs;
802 }
803
804 if (unit_type != NULL)
805 {
806 *unit_type = (int)info_ptr->phys_unit_type;
807 retval |= PNG_INFO_pHYs;
808 }
809 }
810
811 return (retval);
812 }
813 #endif /* pHYs */
814
815 png_uint_32 PNGAPI
816 png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr,
817 png_colorp *palette, int *num_palette)
818 {
819 png_debug1(1, "in %s retrieval function", "PLTE");
820
821 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
822 && palette != NULL)
823 {
824 *palette = info_ptr->palette;
825 *num_palette = info_ptr->num_palette;
826 png_debug1(3, "num_palette = %d", *num_palette);
827 return (PNG_INFO_PLTE);
828 }
829
830 return (0);
831 }
832
833 #ifdef PNG_sBIT_SUPPORTED
834 png_uint_32 PNGAPI
835 png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr,
836 png_color_8p *sig_bit)
837 {
838 png_debug1(1, "in %s retrieval function", "sBIT");
839
840 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
841 && sig_bit != NULL)
842 {
843 *sig_bit = &(info_ptr->sig_bit);
844 return (PNG_INFO_sBIT);
845 }
846
847 return (0);
848 }
849 #endif
850
851 #ifdef PNG_TEXT_SUPPORTED
852 png_uint_32 PNGAPI
853 png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
854 png_textp *text_ptr, int *num_text)
855 {
856 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
857 {
858 png_debug1(1, "in %s retrieval function",
859 (png_ptr->chunk_name[0] == '\0' ? "text" :
860 (png_const_charp)png_ptr->chunk_name));
861
862 if (text_ptr != NULL)
863 *text_ptr = info_ptr->text;
864
865 if (num_text != NULL)
866 *num_text = info_ptr->num_text;
867
868 return ((png_uint_32)info_ptr->num_text);
869 }
870
871 if (num_text != NULL)
872 *num_text = 0;
873
874 return(0);
875 }
876 #endif
877
878 #ifdef PNG_tIME_SUPPORTED
879 png_uint_32 PNGAPI
880 png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
881 {
882 png_debug1(1, "in %s retrieval function", "tIME");
883
884 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
885 && mod_time != NULL)
886 {
887 *mod_time = &(info_ptr->mod_time);
888 return (PNG_INFO_tIME);
889 }
890
891 return (0);
892 }
893 #endif
894
895 #ifdef PNG_tRNS_SUPPORTED
896 png_uint_32 PNGAPI
897 png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr,
898 png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
899 {
900 png_uint_32 retval = 0;
901 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
902 {
903 png_debug1(1, "in %s retrieval function", "tRNS");
904
905 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
906 {
907 if (trans_alpha != NULL)
908 {
909 *trans_alpha = info_ptr->trans_alpha;
910 retval |= PNG_INFO_tRNS;
911 }
912
913 if (trans_color != NULL)
914 *trans_color = &(info_ptr->trans_color);
915 }
916
917 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
918 {
919 if (trans_color != NULL)
920 {
921 *trans_color = &(info_ptr->trans_color);
922 retval |= PNG_INFO_tRNS;
923 }
924
925 if (trans_alpha != NULL)
926 *trans_alpha = NULL;
927 }
928
929 if (num_trans != NULL)
930 {
931 *num_trans = info_ptr->num_trans;
932 retval |= PNG_INFO_tRNS;
933 }
934 }
935
936 return (retval);
937 }
938 #endif
939
940 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
941 int PNGAPI
942 png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr,
943 png_unknown_chunkpp unknowns)
944 {
945 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
946 {
947 *unknowns = info_ptr->unknown_chunks;
948 return info_ptr->unknown_chunks_num;
949 }
950
951 return (0);
952 }
953 #endif
954
955 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
956 png_byte PNGAPI
957 png_get_rgb_to_gray_status (png_const_structp png_ptr)
958 {
959 return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
960 }
961 #endif
962
963 #ifdef PNG_USER_CHUNKS_SUPPORTED
964 png_voidp PNGAPI
965 png_get_user_chunk_ptr(png_const_structp png_ptr)
966 {
967 return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
968 }
969 #endif
970
971 png_size_t PNGAPI
972 png_get_compression_buffer_size(png_const_structp png_ptr)
973 {
974 return (png_ptr ? png_ptr->zbuf_size : 0L);
975 }
976
977
978 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
979 /* These functions were added to libpng 1.2.6 and were enabled
980 * by default in libpng-1.4.0 */
981 png_uint_32 PNGAPI
982 png_get_user_width_max (png_const_structp png_ptr)
983 {
984 return (png_ptr ? png_ptr->user_width_max : 0);
985 }
986
987 png_uint_32 PNGAPI
988 png_get_user_height_max (png_const_structp png_ptr)
989 {
990 return (png_ptr ? png_ptr->user_height_max : 0);
991 }
992
993 /* This function was added to libpng 1.4.0 */
994 png_uint_32 PNGAPI
995 png_get_chunk_cache_max (png_const_structp png_ptr)
996 {
997 return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
998 }
999
1000 /* This function was added to libpng 1.4.1 */
1001 png_alloc_size_t PNGAPI
1002 png_get_chunk_malloc_max (png_const_structp png_ptr)
1003 {
1004 return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1005 }
1006 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1007
1008 /* These functions were added to libpng 1.4.0 */
1009 #ifdef PNG_IO_STATE_SUPPORTED
1010 png_uint_32 PNGAPI
1011 png_get_io_state (png_structp png_ptr)
1012 {
1013 return png_ptr->io_state;
1014 }
1015
1016 png_uint_32 PNGAPI
1017 png_get_io_chunk_type (png_const_structp png_ptr)
1018 {
1019 return ((png_ptr->chunk_name[0] << 24) +
1020 (png_ptr->chunk_name[1] << 16) +
1021 (png_ptr->chunk_name[2] << 8) +
1022 (png_ptr->chunk_name[3]));
1023 }
1024
1025 png_const_bytep PNGAPI
1026 png_get_io_chunk_name (png_structp png_ptr)
1027 {
1028 return png_ptr->chunk_name;
1029 }
1030 #endif /* ?PNG_IO_STATE_SUPPORTED */
1031
1032 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
png_get_x_pixels_per_inch
png_uint_32 PNGAPI png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:316
png_get_rowbytes
png_size_t PNGAPI png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:30
png_get_x_offset_inches_fixed
png_fixed_point PNGAPI png_get_x_offset_inches_fixed(png_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:340
PNG_INFO_gAMA
#define PNG_INFO_gAMA
Definition: png.h:753
PNG_INFO_tIME
#define PNG_INFO_tIME
Definition: png.h:762
PNG_INFO_sRGB
#define PNG_INFO_sRGB
Definition: png.h:764
png_get_PLTE
png_uint_32 PNGAPI png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr, png_colorp *palette, int *num_palette)
Definition: pngget.c:816
png_get_y_pixels_per_inch
png_uint_32 PNGAPI png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:322
png_get_sCAL_s
png_uint_32 PNGAPI png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr, int *unit, png_charpp width, png_charpp height)
Definition: pngget.c:764
png_get_sRGB
png_uint_32 PNGAPI png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr, int *file_srgb_intent)
Definition: pngget.c:565
png_get_y_offset_inches
float PNGAPI png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:371
PNG_INFO_hIST
#define PNG_INFO_hIST
Definition: png.h:759
PNG_UINT_31_MAX
#define PNG_UINT_31_MAX
Definition: png.h:672
png_get_color_type
png_byte PNGAPI png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:79
png_const_structp
PNG_CONST png_struct FAR * png_const_structp
Definition: png.h:796
png_get_chunk_cache_max
png_uint_32 PNGAPI png_get_chunk_cache_max(png_const_structp png_ptr)
Definition: pngget.c:995
png_color_16p
png_color_16 FAR * png_color_16p
Definition: png.h:536
png_get_x_offset_inches
float PNGAPI png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:360
png_struct_def::width
png_uint_32 width
Definition: pngstruct.h:73
png_get_sPLT
png_uint_32 PNGAPI png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr, png_sPLT_tpp spalettes)
Definition: pngget.c:608
png_charp
char FAR * png_charp
Definition: pngconf.h:572
PNG_COLOR_TYPE_PALETTE
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:690
png_get_compression_type
png_byte PNGAPI png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:106
png_fixed
png_fixed_point png_fixed(png_structp png_ptr, double fp, png_const_charp text)
Definition: png.c:1459
png_get_io_chunk_name
png_const_bytep PNGAPI png_get_io_chunk_name(png_structp png_ptr)
Definition: pngget.c:1026
png_get_hIST
png_uint_32 PNGAPI png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr, png_uint_16p *hist)
Definition: pngget.c:623
png_int_32
long png_int_32
Definition: pngconf.h:481
png_get_pixels_per_meter
png_uint_32 PNGAPI png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:149
png_get_sCAL
png_uint_32 PNGAPI png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr, int *unit, double *width, double *height)
Definition: pngget.c:748
png_get_text
png_uint_32 PNGAPI png_get_text(png_const_structp png_ptr, png_const_infop info_ptr, png_textp *text_ptr, int *num_text)
Definition: pngget.c:853
png_const_charp
PNG_CONST char FAR * png_const_charp
Definition: pngconf.h:573
png_get_image_width
png_uint_32 PNGAPI png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:52
png_get_gAMA
png_uint_32 PNGAPI png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr, double *file_gamma)
Definition: pngget.c:548
png_get_y_offset_pixels
png_int_32 PNGAPI png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:261
png_float
#define png_float(png_ptr, fixed, s)
Definition: pngpriv.h:407
PNG_INFO_oFFs
#define PNG_INFO_oFFs
Definition: png.h:761
png_get_tIME
png_uint_32 PNGAPI png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
Definition: pngget.c:880
png_get_cHRM
png_uint_32 PNGAPI png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, double *red_y, double *green_x, double *green_y, double *blue_x, double *blue_y)
Definition: pngget.c:464
png_textp
png_text FAR * png_textp
Definition: png.h:610
png_unknown_chunkpp
png_unknown_chunk FAR *FAR * png_unknown_chunkpp
Definition: png.h:663
png_get_pixels_per_inch
png_uint_32 PNGAPI png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:310
png_get_image_height
png_uint_32 PNGAPI png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:61
png_struct_def::color_type
png_byte color_type
Definition: pngstruct.h:99
png_alloc_size_t
png_size_t png_alloc_size_t
Definition: pngconf.h:627
png_get_pCAL
png_uint_32 PNGAPI png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, png_charp *units, png_charpp *params)
Definition: pngget.c:700
png_get_sBIT
png_uint_32 PNGAPI png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
Definition: pngget.c:835
png_bytepp
png_byte FAR *FAR * png_bytepp
Definition: pngconf.h:589
png_get_y_pixels_per_meter
png_uint_32 PNGAPI png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:132
png_get_x_offset_pixels
png_int_32 PNGAPI png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:245
png_struct_def::compression_type
png_byte compression_type
Definition: pngstruct.h:273
png_uint_32
unsigned long png_uint_32
Definition: pngconf.h:480
png_get_chunk_malloc_max
png_alloc_size_t PNGAPI png_get_chunk_malloc_max(png_const_structp png_ptr)
Definition: pngget.c:1002
PNGAPI
#define PNGAPI
Definition: pngconf.h:256
png_check_IHDR
void png_check_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type)
Definition: png.c:745
png_structp
png_struct FAR * png_structp
Definition: png.h:797
png_struct_def::palette
png_colorp palette
Definition: pngstruct.h:90
png_get_y_offset_microns
png_int_32 PNGAPI png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:229
PNGFAPI
#define PNGFAPI
Definition: pngpriv.h:131
png_timep
png_time FAR * png_timep
Definition: png.h:640
png_infop
png_info FAR * png_infop
Definition: png.h:667
png_muldiv_warn
png_fixed_point png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times, png_int_32 divisor)
Definition: png.c:1598
png_get_interlace_type
png_byte PNGAPI png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:97
png_get_IHDR
png_uint_32 PNGAPI png_get_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_type, int *compression_type, int *filter_type)
Definition: pngget.c:640
png_byte
unsigned char png_byte
Definition: pngconf.h:485
PNG_OFFSET_PIXEL
#define PNG_OFFSET_PIXEL
Definition: png.h:713
png_get_io_state
png_uint_32 PNGAPI png_get_io_state(png_structp png_ptr)
Definition: pngget.c:1011
png_get_user_width_max
png_uint_32 PNGAPI png_get_user_width_max(png_const_structp png_ptr)
Definition: pngget.c:982
png_struct_def::num_palette
png_uint_16 num_palette
Definition: pngstruct.h:91
png_get_user_height_max
png_uint_32 PNGAPI png_get_user_height_max(png_const_structp png_ptr)
Definition: pngget.c:988
png_uint_16p
png_uint_16 FAR * png_uint_16p
Definition: pngconf.h:568
png_const_bytep
PNG_CONST png_byte FAR * png_const_bytep
Definition: pngconf.h:563
png_debug1
#define png_debug1(l, m, p1)
Definition: pngdebug.h:152
PNG_RESOLUTION_METER
#define PNG_RESOLUTION_METER
Definition: png.h:732
png_get_sCAL_fixed
png_uint_32 PNGAPI png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr, int *unit, png_fixed_point *width, png_fixed_point *height)
Definition: pngget.c:728
png_muldiv
int png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times, png_int_32 divisor)
Definition: png.c:1479
png_get_x_offset_microns
png_int_32 PNGAPI png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:213
png_get_valid
png_uint_32 PNGAPI png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 flag)
Definition: pngget.c:20
png_get_oFFs
png_uint_32 PNGAPI png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
Definition: pngget.c:680
PNG_INFO_sBIT
#define PNG_INFO_sBIT
Definition: png.h:754
png_get_signature
png_const_bytep PNGAPI png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
Definition: pngget.c:435
png_const_infop
PNG_CONST png_info FAR * png_const_infop
Definition: png.h:668
PNG_INFO_PLTE
#define PNG_INFO_PLTE
Definition: png.h:756
png_bytep
png_byte FAR * png_bytep
Definition: pngconf.h:562
png_get_bit_depth
png_byte PNGAPI png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:70
png_get_tRNS
png_uint_32 PNGAPI png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr, png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
Definition: pngget.c:897
PNG_FP_1
#define PNG_FP_1
Definition: png.h:679
png_struct_def::bit_depth
png_byte bit_depth
Definition: pngstruct.h:100
pngpriv.h
png_get_gAMA_fixed
png_uint_32 PNGFAPI png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr, png_fixed_point *file_gamma)
Definition: pngget.c:532
png_get_filter_type
png_byte PNGAPI png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:88
PNG_INFO_tRNS
#define PNG_INFO_tRNS
Definition: png.h:757
PNG_OFFSET_MICROMETER
#define PNG_OFFSET_MICROMETER
Definition: png.h:714
png_color_8p
png_color_8 FAR * png_color_8p
Definition: png.h:548
png_get_cHRM_fixed
png_uint_32 PNGAPI png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr, png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, png_fixed_point *blue_x, png_fixed_point *blue_y)
Definition: pngget.c:497
png_struct_def::num_trans
png_uint_16 num_trans
Definition: pngstruct.h:92
png_voidp
void FAR * png_voidp
Definition: pngconf.h:560
png_fixed_point
png_int_32 png_fixed_point
Definition: pngconf.h:557
png_charpp
char FAR *FAR * png_charpp
Definition: pngconf.h:595
png_get_rows
png_bytepp PNGAPI png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:40
png_size_t
size_t png_size_t
Definition: pngconf.h:490
png_get_y_offset_inches_fixed
png_fixed_point PNGAPI png_get_y_offset_inches_fixed(png_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:350
png_get_unknown_chunks
int PNGAPI png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr, png_unknown_chunkpp unknowns)
Definition: pngget.c:942
png_get_pHYs_dpi
png_uint_32 PNGAPI png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
Definition: pngget.c:382
png_sPLT_tpp
png_sPLT_t FAR *FAR * png_sPLT_tpp
Definition: png.h:582
png_get_iCCP
png_uint_32 PNGAPI png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr, png_charpp name, int *compression_type, png_bytepp profile, png_uint_32 *proflen)
Definition: pngget.c:583
png_get_channels
png_byte PNGAPI png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:426
png_struct_def::height
png_uint_32 height
Definition: pngstruct.h:74
png_get_bKGD
png_uint_32 PNGAPI png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr, png_color_16p *background)
Definition: pngget.c:445
png_get_x_pixels_per_meter
png_uint_32 PNGAPI png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:115
png_get_user_chunk_ptr
png_voidp PNGAPI png_get_user_chunk_ptr(png_const_structp png_ptr)
Definition: pngget.c:965
png_get_rgb_to_gray_status
png_byte PNGAPI png_get_rgb_to_gray_status(png_const_structp png_ptr)
Definition: pngget.c:957
PNG_INFO_pHYs
#define PNG_INFO_pHYs
Definition: png.h:760
PNG_INFO_pCAL
#define PNG_INFO_pCAL
Definition: png.h:763
PNG_INFO_cHRM
#define PNG_INFO_cHRM
Definition: png.h:755
png_get_io_chunk_type
png_uint_32 PNGAPI png_get_io_chunk_type(png_const_structp png_ptr)
Definition: pngget.c:1017
PNG_INFO_bKGD
#define PNG_INFO_bKGD
Definition: png.h:758
png_get_compression_buffer_size
png_size_t PNGAPI png_get_compression_buffer_size(png_const_structp png_ptr)
Definition: pngget.c:972
png_get_pixel_aspect_ratio
float PNGAPI png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:167
png_get_pHYs
png_uint_32 PNGAPI png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
Definition: pngget.c:782
png_get_pixel_aspect_ratio_fixed
png_fixed_point PNGAPI png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: pngget.c:186
PNG_INFO_iCCP
#define PNG_INFO_iCCP
Definition: png.h:765
PNG_INFO_sCAL
#define PNG_INFO_sCAL
Definition: png.h:767
png_colorp
png_color FAR * png_colorp
Definition: png.h:524