1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /* pngget.c - retrieval of values from info struct
26 *
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file and, per its terms, should not be removed:
31
32 * Last changed in libpng 1.6.26 [October 20, 2016]
33 * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
34 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
35 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
36 *
37 * This code is released under the libpng license.
38 * For conditions of distribution and use, see the disclaimer
39 * and license in png.h
40 *
41 */
42
43 #include "pngpriv.h"
44
45 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
46
47 png_uint_32 PNGAPI
48 png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
49 png_uint_32 flag)
50 {
51 if (png_ptr != NULL && info_ptr != NULL)
52 return(info_ptr->valid & flag);
53
54 return(0);
55 }
56
57 png_size_t PNGAPI
58 png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
59 {
60 if (png_ptr != NULL && info_ptr != NULL)
61 return(info_ptr->rowbytes);
62
63 return(0);
64 }
65
66 #ifdef PNG_INFO_IMAGE_SUPPORTED
67 png_bytepp PNGAPI
68 png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
69 {
70 if (png_ptr != NULL && info_ptr != NULL)
71 return(info_ptr->row_pointers);
72
73 return(0);
74 }
75 #endif
76
77 #ifdef PNG_EASY_ACCESS_SUPPORTED
78 /* Easy access to info, added in libpng-0.99 */
79 png_uint_32 PNGAPI
80 png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
81 {
82 if (png_ptr != NULL && info_ptr != NULL)
83 return info_ptr->width;
84
85 return (0);
86 }
87
88 png_uint_32 PNGAPI
89 png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
90 {
91 if (png_ptr != NULL && info_ptr != NULL)
92 return info_ptr->height;
93
94 return (0);
95 }
96
97 png_byte PNGAPI
98 png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
99 {
100 if (png_ptr != NULL && info_ptr != NULL)
101 return info_ptr->bit_depth;
102
103 return (0);
104 }
105
106 png_byte PNGAPI
107 png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
108 {
109 if (png_ptr != NULL && info_ptr != NULL)
110 return info_ptr->color_type;
111
112 return (0);
113 }
114
115 png_byte PNGAPI
116 png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
117 {
118 if (png_ptr != NULL && info_ptr != NULL)
119 return info_ptr->filter_type;
120
121 return (0);
122 }
123
124 png_byte PNGAPI
125 png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
126 {
127 if (png_ptr != NULL && info_ptr != NULL)
128 return info_ptr->interlace_type;
129
130 return (0);
131 }
132
133 png_byte PNGAPI
134 png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
135 {
136 if (png_ptr != NULL && info_ptr != NULL)
137 return info_ptr->compression_type;
138
139 return (0);
140 }
141
142 png_uint_32 PNGAPI
143 png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
144 info_ptr)
145 {
146 #ifdef PNG_pHYs_SUPPORTED
147 if (png_ptr != NULL && info_ptr != NULL &&
148 (info_ptr->valid & PNG_INFO_pHYs) != 0)
149 {
150 png_debug1(1, "in %s retrieval function",
151 "png_get_x_pixels_per_meter");
152
153 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
154 return (info_ptr->x_pixels_per_unit);
155 }
156 #else
157 PNG_UNUSED(png_ptr)
158 PNG_UNUSED(info_ptr)
159 #endif
160
161 return (0);
162 }
163
164 png_uint_32 PNGAPI
165 png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
166 info_ptr)
167 {
168 #ifdef PNG_pHYs_SUPPORTED
169 if (png_ptr != NULL && info_ptr != NULL &&
170 (info_ptr->valid & PNG_INFO_pHYs) != 0)
171 {
172 png_debug1(1, "in %s retrieval function",
173 "png_get_y_pixels_per_meter");
174
175 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
176 return (info_ptr->y_pixels_per_unit);
177 }
178 #else
179 PNG_UNUSED(png_ptr)
180 PNG_UNUSED(info_ptr)
181 #endif
182
183 return (0);
184 }
185
186 png_uint_32 PNGAPI
187 png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
188 {
189 #ifdef PNG_pHYs_SUPPORTED
190 if (png_ptr != NULL && info_ptr != NULL &&
191 (info_ptr->valid & PNG_INFO_pHYs) != 0)
192 {
193 png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
194
195 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
196 info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
197 return (info_ptr->x_pixels_per_unit);
198 }
199 #else
200 PNG_UNUSED(png_ptr)
201 PNG_UNUSED(info_ptr)
202 #endif
203
204 return (0);
205 }
206
207 #ifdef PNG_FLOATING_POINT_SUPPORTED
208 float PNGAPI
209 png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
210 info_ptr)
211 {
212 #ifdef PNG_READ_pHYs_SUPPORTED
213 if (png_ptr != NULL && info_ptr != NULL &&
214 (info_ptr->valid & PNG_INFO_pHYs) != 0)
215 {
216 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
217
218 if (info_ptr->x_pixels_per_unit != 0)
219 return ((float)((float)info_ptr->y_pixels_per_unit
220 /(float)info_ptr->x_pixels_per_unit));
221 }
222 #else
223 PNG_UNUSED(png_ptr)
224 PNG_UNUSED(info_ptr)
225 #endif
226
227 return ((float)0.0);
228 }
229 #endif
230
231 #ifdef PNG_FIXED_POINT_SUPPORTED
232 png_fixed_point PNGAPI
233 png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
234 png_const_inforp info_ptr)
235 {
236 #ifdef PNG_READ_pHYs_SUPPORTED
237 if (png_ptr != NULL && info_ptr != NULL &&
238 (info_ptr->valid & PNG_INFO_pHYs) != 0 &&
239 info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
240 info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
241 info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
242 {
243 png_fixed_point res;
244
245 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
246
247 /* The following casts work because a PNG 4 byte integer only has a valid
248 * range of 0..2^31-1; otherwise the cast might overflow.
249 */
250 if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
251 (png_int_32)info_ptr->x_pixels_per_unit) != 0)
252 return res;
253 }
254 #else
255 PNG_UNUSED(png_ptr)
256 PNG_UNUSED(info_ptr)
257 #endif
258
259 return 0;
260 }
261 #endif
262
263 png_int_32 PNGAPI
264 png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
265 {
266 #ifdef PNG_oFFs_SUPPORTED
267 if (png_ptr != NULL && info_ptr != NULL &&
268 (info_ptr->valid & PNG_INFO_oFFs) != 0)
269 {
270 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
271
272 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
273 return (info_ptr->x_offset);
274 }
275 #else
276 PNG_UNUSED(png_ptr)
277 PNG_UNUSED(info_ptr)
278 #endif
279
280 return (0);
281 }
282
283 png_int_32 PNGAPI
284 png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
285 {
286 #ifdef PNG_oFFs_SUPPORTED
287 if (png_ptr != NULL && info_ptr != NULL &&
288 (info_ptr->valid & PNG_INFO_oFFs) != 0)
289 {
290 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
291
292 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
293 return (info_ptr->y_offset);
294 }
295 #else
296 PNG_UNUSED(png_ptr)
297 PNG_UNUSED(info_ptr)
298 #endif
299
300 return (0);
301 }
302
303 png_int_32 PNGAPI
304 png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
305 {
306 #ifdef PNG_oFFs_SUPPORTED
307 if (png_ptr != NULL && info_ptr != NULL &&
308 (info_ptr->valid & PNG_INFO_oFFs) != 0)
309 {
310 png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
311
312 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
313 return (info_ptr->x_offset);
314 }
315 #else
316 PNG_UNUSED(png_ptr)
317 PNG_UNUSED(info_ptr)
318 #endif
319
320 return (0);
321 }
322
323 png_int_32 PNGAPI
324 png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
325 {
326 #ifdef PNG_oFFs_SUPPORTED
327 if (png_ptr != NULL && info_ptr != NULL &&
328 (info_ptr->valid & PNG_INFO_oFFs) != 0)
329 {
330 png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
331
332 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
333 return (info_ptr->y_offset);
334 }
335 #else
336 PNG_UNUSED(png_ptr)
337 PNG_UNUSED(info_ptr)
338 #endif
339
340 return (0);
341 }
342
343 #ifdef PNG_INCH_CONVERSIONS_SUPPORTED
344 static png_uint_32
345 ppi_from_ppm(png_uint_32 ppm)
346 {
347 #if 0
348 /* The conversion is *(2.54/100), in binary (32 digits):
349 * .00000110100000001001110101001001
350 */
351 png_uint_32 t1001, t1101;
352 ppm >>= 1; /* .1 */
353 t1001 = ppm + (ppm >> 3); /* .1001 */
354 t1101 = t1001 + (ppm >> 1); /* .1101 */
355 ppm >>= 20; /* .000000000000000000001 */
356 t1101 += t1101 >> 15; /* .1101000000000001101 */
357 t1001 >>= 11; /* .000000000001001 */
358 t1001 += t1001 >> 12; /* .000000000001001000000001001 */
359 ppm += t1001; /* .000000000001001000001001001 */
360 ppm += t1101; /* .110100000001001110101001001 */
361 return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
362 #else
363 /* The argument is a PNG unsigned integer, so it is not permitted
364 * to be bigger than 2^31.
365 */
366 png_fixed_point result;
367 if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
368 5000) != 0)
369 return (png_uint_32)result;
370
371 /* Overflow. */
372 return 0;
373 #endif
374 }
375
376 png_uint_32 PNGAPI
377 png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
378 {
379 return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
380 }
381
382 png_uint_32 PNGAPI
383 png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
384 {
385 return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
386 }
387
388 png_uint_32 PNGAPI
389 png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
390 {
391 return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
392 }
393
394 #ifdef PNG_FIXED_POINT_SUPPORTED
395 static png_fixed_point
396 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
397 {
398 /* Convert from metres * 1,000,000 to inches * 100,000, meters to
399 * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
400 * Notice that this can overflow - a warning is output and 0 is
401 * returned.
402 */
403 return png_muldiv_warn(png_ptr, microns, 500, 127);
404 }
405
406 png_fixed_point PNGAPI
407 png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
408 png_const_inforp info_ptr)
409 {
410 return png_fixed_inches_from_microns(png_ptr,
411 png_get_x_offset_microns(png_ptr, info_ptr));
412 }
413 #endif
414
415 #ifdef PNG_FIXED_POINT_SUPPORTED
416 png_fixed_point PNGAPI
417 png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
418 png_const_inforp info_ptr)
419 {
420 return png_fixed_inches_from_microns(png_ptr,
421 png_get_y_offset_microns(png_ptr, info_ptr));
422 }
423 #endif
424
425 #ifdef PNG_FLOATING_POINT_SUPPORTED
426 float PNGAPI
427 png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
428 {
429 /* To avoid the overflow do the conversion directly in floating
430 * point.
431 */
432 return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
433 }
434 #endif
435
436 #ifdef PNG_FLOATING_POINT_SUPPORTED
437 float PNGAPI
438 png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
439 {
440 /* To avoid the overflow do the conversion directly in floating
441 * point.
442 */
443 return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
444 }
445 #endif
446
447 #ifdef PNG_pHYs_SUPPORTED
448 png_uint_32 PNGAPI
449 png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
450 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
451 {
452 png_uint_32 retval = 0;
453
454 if (png_ptr != NULL && info_ptr != NULL &&
455 (info_ptr->valid & PNG_INFO_pHYs) != 0)
456 {
457 png_debug1(1, "in %s retrieval function", "pHYs");
458
459 if (res_x != NULL)
460 {
461 *res_x = info_ptr->x_pixels_per_unit;
462 retval |= PNG_INFO_pHYs;
463 }
464
465 if (res_y != NULL)
466 {
467 *res_y = info_ptr->y_pixels_per_unit;
468 retval |= PNG_INFO_pHYs;
469 }
470
471 if (unit_type != NULL)
472 {
473 *unit_type = (int)info_ptr->phys_unit_type;
474 retval |= PNG_INFO_pHYs;
475
476 if (*unit_type == 1)
477 {
478 if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
479 if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
480 }
481 }
482 }
483
484 return (retval);
485 }
486 #endif /* pHYs */
487 #endif /* INCH_CONVERSIONS */
488
489 /* png_get_channels really belongs in here, too, but it's been around longer */
490
491 #endif /* EASY_ACCESS */
492
493
494 png_byte PNGAPI
495 png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
496 {
497 if (png_ptr != NULL && info_ptr != NULL)
498 return(info_ptr->channels);
499
500 return (0);
501 }
502
503 #ifdef PNG_READ_SUPPORTED
504 png_const_bytep PNGAPI
505 png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
506 {
507 if (png_ptr != NULL && info_ptr != NULL)
508 return(info_ptr->signature);
509
510 return (NULL);
511 }
512 #endif
513
514 #ifdef PNG_bKGD_SUPPORTED
515 png_uint_32 PNGAPI
516 png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
517 png_color_16p *background)
518 {
519 if (png_ptr != NULL && info_ptr != NULL &&
520 (info_ptr->valid & PNG_INFO_bKGD) != 0 &&
521 background != NULL)
522 {
523 png_debug1(1, "in %s retrieval function", "bKGD");
524
525 *background = &(info_ptr->background);
526 return (PNG_INFO_bKGD);
527 }
528
529 return (0);
530 }
531 #endif
532
533 #ifdef PNG_cHRM_SUPPORTED
534 /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
535 * same time to correct the rgb grayscale coefficient defaults obtained from the
536 * cHRM chunk in 1.5.4
537 */
538 # ifdef PNG_FLOATING_POINT_SUPPORTED
539 png_uint_32 PNGAPI
540 png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
541 double *white_x, double *white_y, double *red_x, double *red_y,
542 double *green_x, double *green_y, double *blue_x, double *blue_y)
543 {
544 /* Quiet API change: this code used to only return the end points if a cHRM
545 * chunk was present, but the end points can also come from iCCP or sRGB
546 * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
547 * the png_set_ APIs merely check that set end points are mutually
548 * consistent.
549 */
550 if (png_ptr != NULL && info_ptr != NULL &&
551 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
552 {
553 png_debug1(1, "in %s retrieval function", "cHRM");
554
555 if (white_x != NULL)
556 *white_x = png_float(png_ptr,
557 info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
558 if (white_y != NULL)
559 *white_y = png_float(png_ptr,
560 info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
561 if (red_x != NULL)
562 *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
563 "cHRM red X");
564 if (red_y != NULL)
565 *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
566 "cHRM red Y");
567 if (green_x != NULL)
568 *green_x = png_float(png_ptr,
569 info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
570 if (green_y != NULL)
571 *green_y = png_float(png_ptr,
572 info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
573 if (blue_x != NULL)
574 *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
575 "cHRM blue X");
576 if (blue_y != NULL)
577 *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
578 "cHRM blue Y");
579 return (PNG_INFO_cHRM);
580 }
581
582 return (0);
583 }
584
585 png_uint_32 PNGAPI
586 png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
587 double *red_X, double *red_Y, double *red_Z, double *green_X,
588 double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
589 double *blue_Z)
590 {
591 if (png_ptr != NULL && info_ptr != NULL &&
592 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
593 {
594 png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
595
596 if (red_X != NULL)
597 *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
598 "cHRM red X");
599 if (red_Y != NULL)
600 *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
601 "cHRM red Y");
602 if (red_Z != NULL)
603 *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
604 "cHRM red Z");
605 if (green_X != NULL)
606 *green_X = png_float(png_ptr,
607 info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
608 if (green_Y != NULL)
609 *green_Y = png_float(png_ptr,
610 info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
611 if (green_Z != NULL)
612 *green_Z = png_float(png_ptr,
613 info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
614 if (blue_X != NULL)
615 *blue_X = png_float(png_ptr,
616 info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
617 if (blue_Y != NULL)
618 *blue_Y = png_float(png_ptr,
619 info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
620 if (blue_Z != NULL)
621 *blue_Z = png_float(png_ptr,
622 info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
623 return (PNG_INFO_cHRM);
624 }
625
626 return (0);
627 }
628 # endif
629
630 # ifdef PNG_FIXED_POINT_SUPPORTED
631 png_uint_32 PNGAPI
632 png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
633 png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
634 png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
635 png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
636 png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
637 png_fixed_point *int_blue_Z)
638 {
639 if (png_ptr != NULL && info_ptr != NULL &&
640 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
641 {
642 png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
643
644 if (int_red_X != NULL)
645 *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
646 if (int_red_Y != NULL)
647 *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
648 if (int_red_Z != NULL)
649 *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
650 if (int_green_X != NULL)
651 *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
652 if (int_green_Y != NULL)
653 *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
654 if (int_green_Z != NULL)
655 *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
656 if (int_blue_X != NULL)
657 *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
658 if (int_blue_Y != NULL)
659 *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
660 if (int_blue_Z != NULL)
661 *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
662 return (PNG_INFO_cHRM);
663 }
664
665 return (0);
666 }
667
668 png_uint_32 PNGAPI
669 png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
670 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
671 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
672 png_fixed_point *blue_x, png_fixed_point *blue_y)
673 {
674 png_debug1(1, "in %s retrieval function", "cHRM");
675
676 if (png_ptr != NULL && info_ptr != NULL &&
677 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
678 {
679 if (white_x != NULL)
680 *white_x = info_ptr->colorspace.end_points_xy.whitex;
681 if (white_y != NULL)
682 *white_y = info_ptr->colorspace.end_points_xy.whitey;
683 if (red_x != NULL)
684 *red_x = info_ptr->colorspace.end_points_xy.redx;
685 if (red_y != NULL)
686 *red_y = info_ptr->colorspace.end_points_xy.redy;
687 if (green_x != NULL)
688 *green_x = info_ptr->colorspace.end_points_xy.greenx;
689 if (green_y != NULL)
690 *green_y = info_ptr->colorspace.end_points_xy.greeny;
691 if (blue_x != NULL)
692 *blue_x = info_ptr->colorspace.end_points_xy.bluex;
693 if (blue_y != NULL)
694 *blue_y = info_ptr->colorspace.end_points_xy.bluey;
695 return (PNG_INFO_cHRM);
696 }
697
698 return (0);
699 }
700 # endif
701 #endif
702
703 #ifdef PNG_gAMA_SUPPORTED
704 # ifdef PNG_FIXED_POINT_SUPPORTED
705 png_uint_32 PNGAPI
706 png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
707 png_fixed_point *file_gamma)
708 {
709 png_debug1(1, "in %s retrieval function", "gAMA");
710
711 if (png_ptr != NULL && info_ptr != NULL &&
712 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
713 file_gamma != NULL)
714 {
715 *file_gamma = info_ptr->colorspace.gamma;
716 return (PNG_INFO_gAMA);
717 }
718
719 return (0);
720 }
721 # endif
722
723 # ifdef PNG_FLOATING_POINT_SUPPORTED
724 png_uint_32 PNGAPI
725 png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
726 double *file_gamma)
727 {
728 png_debug1(1, "in %s retrieval function", "gAMA(float)");
729
730 if (png_ptr != NULL && info_ptr != NULL &&
731 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
732 file_gamma != NULL)
733 {
734 *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
735 "png_get_gAMA");
736 return (PNG_INFO_gAMA);
737 }
738
739 return (0);
740 }
741 # endif
742 #endif
743
744 #ifdef PNG_sRGB_SUPPORTED
745 png_uint_32 PNGAPI
746 png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
747 int *file_srgb_intent)
748 {
749 png_debug1(1, "in %s retrieval function", "sRGB");
750
751 if (png_ptr != NULL && info_ptr != NULL &&
752 (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL)
753 {
754 *file_srgb_intent = info_ptr->colorspace.rendering_intent;
755 return (PNG_INFO_sRGB);
756 }
757
758 return (0);
759 }
760 #endif
761
762 #ifdef PNG_iCCP_SUPPORTED
763 png_uint_32 PNGAPI
764 png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
765 png_charpp name, int *compression_type,
766 png_bytepp profile, png_uint_32 *proflen)
767 {
768 png_debug1(1, "in %s retrieval function", "iCCP");
769
770 if (png_ptr != NULL && info_ptr != NULL &&
771 (info_ptr->valid & PNG_INFO_iCCP) != 0 &&
772 name != NULL && compression_type != NULL && profile != NULL &&
773 proflen != NULL)
774 {
775 *name = info_ptr->iccp_name;
776 *profile = info_ptr->iccp_profile;
777 *proflen = png_get_uint_32(info_ptr->iccp_profile);
778 /* This is somewhat irrelevant since the profile data returned has
779 * actually been uncompressed.
780 */
781 *compression_type = PNG_COMPRESSION_TYPE_BASE;
782 return (PNG_INFO_iCCP);
783 }
784
785 return (0);
786 }
787 #endif
788
789 #ifdef PNG_sPLT_SUPPORTED
790 int PNGAPI
791 png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
792 png_sPLT_tpp spalettes)
793 {
794 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
795 {
796 *spalettes = info_ptr->splt_palettes;
797 return info_ptr->splt_palettes_num;
798 }
799
800 return (0);
801 }
802 #endif
803
804 #ifdef PNG_hIST_SUPPORTED
805 png_uint_32 PNGAPI
806 png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
807 png_uint_16p *hist)
808 {
809 png_debug1(1, "in %s retrieval function", "hIST");
810
811 if (png_ptr != NULL && info_ptr != NULL &&
812 (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
813 {
814 *hist = info_ptr->hist;
815 return (PNG_INFO_hIST);
816 }
817
818 return (0);
819 }
820 #endif
821
822 png_uint_32 PNGAPI
823 png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
824 png_uint_32 *width, png_uint_32 *height, int *bit_depth,
825 int *color_type, int *interlace_type, int *compression_type,
826 int *filter_type)
827 {
828 png_debug1(1, "in %s retrieval function", "IHDR");
829
830 if (png_ptr == NULL || info_ptr == NULL)
831 return (0);
832
833 if (width != NULL)
834 *width = info_ptr->width;
835
836 if (height != NULL)
837 *height = info_ptr->height;
838
839 if (bit_depth != NULL)
840 *bit_depth = info_ptr->bit_depth;
841
842 if (color_type != NULL)
843 *color_type = info_ptr->color_type;
844
845 if (compression_type != NULL)
846 *compression_type = info_ptr->compression_type;
847
848 if (filter_type != NULL)
849 *filter_type = info_ptr->filter_type;
850
851 if (interlace_type != NULL)
852 *interlace_type = info_ptr->interlace_type;
853
854 /* This is redundant if we can be sure that the info_ptr values were all
855 * assigned in png_set_IHDR(). We do the check anyhow in case an
856 * application has ignored our advice not to mess with the members
857 * of info_ptr directly.
858 */
859 png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
860 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
861 info_ptr->compression_type, info_ptr->filter_type);
862
863 return (1);
864 }
865
866 #ifdef PNG_oFFs_SUPPORTED
867 png_uint_32 PNGAPI
868 png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
869 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
870 {
871 png_debug1(1, "in %s retrieval function", "oFFs");
872
873 if (png_ptr != NULL && info_ptr != NULL &&
874 (info_ptr->valid & PNG_INFO_oFFs) != 0 &&
875 offset_x != NULL && offset_y != NULL && unit_type != NULL)
876 {
877 *offset_x = info_ptr->x_offset;
878 *offset_y = info_ptr->y_offset;
879 *unit_type = (int)info_ptr->offset_unit_type;
880 return (PNG_INFO_oFFs);
881 }
882
883 return (0);
884 }
885 #endif
886
887 #ifdef PNG_pCAL_SUPPORTED
888 png_uint_32 PNGAPI
889 png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
890 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
891 png_charp *units, png_charpp *params)
892 {
893 png_debug1(1, "in %s retrieval function", "pCAL");
894
895 if (png_ptr != NULL && info_ptr != NULL &&
896 (info_ptr->valid & PNG_INFO_pCAL) != 0 &&
897 purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
898 nparams != NULL && units != NULL && params != NULL)
899 {
900 *purpose = info_ptr->pcal_purpose;
901 *X0 = info_ptr->pcal_X0;
902 *X1 = info_ptr->pcal_X1;
903 *type = (int)info_ptr->pcal_type;
904 *nparams = (int)info_ptr->pcal_nparams;
905 *units = info_ptr->pcal_units;
906 *params = info_ptr->pcal_params;
907 return (PNG_INFO_pCAL);
908 }
909
910 return (0);
911 }
912 #endif
913
914 #ifdef PNG_sCAL_SUPPORTED
915 # ifdef PNG_FIXED_POINT_SUPPORTED
916 # if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
917 defined(PNG_FLOATING_POINT_SUPPORTED)
918 png_uint_32 PNGAPI
919 png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
920 int *unit, png_fixed_point *width, png_fixed_point *height)
921 {
922 if (png_ptr != NULL && info_ptr != NULL &&
923 (info_ptr->valid & PNG_INFO_sCAL) != 0)
924 {
925 *unit = info_ptr->scal_unit;
926 /*TODO: make this work without FP support; the API is currently eliminated
927 * if neither floating point APIs nor internal floating point arithmetic
928 * are enabled.
929 */
930 *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
931 *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
932 "sCAL height");
933 return (PNG_INFO_sCAL);
934 }
935
936 return(0);
937 }
938 # endif /* FLOATING_ARITHMETIC */
939 # endif /* FIXED_POINT */
940 # ifdef PNG_FLOATING_POINT_SUPPORTED
941 png_uint_32 PNGAPI
942 png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
943 int *unit, double *width, double *height)
944 {
945 if (png_ptr != NULL && info_ptr != NULL &&
946 (info_ptr->valid & PNG_INFO_sCAL) != 0)
947 {
948 *unit = info_ptr->scal_unit;
949 *width = atof(info_ptr->scal_s_width);
950 *height = atof(info_ptr->scal_s_height);
951 return (PNG_INFO_sCAL);
952 }
953
954 return(0);
955 }
956 # endif /* FLOATING POINT */
957 png_uint_32 PNGAPI
958 png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
959 int *unit, png_charpp width, png_charpp height)
960 {
961 if (png_ptr != NULL && info_ptr != NULL &&
962 (info_ptr->valid & PNG_INFO_sCAL) != 0)
963 {
964 *unit = info_ptr->scal_unit;
965 *width = info_ptr->scal_s_width;
966 *height = info_ptr->scal_s_height;
967 return (PNG_INFO_sCAL);
968 }
969
970 return(0);
971 }
972 #endif /* sCAL */
973
974 #ifdef PNG_pHYs_SUPPORTED
975 png_uint_32 PNGAPI
976 png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
977 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
978 {
979 png_uint_32 retval = 0;
980
981 png_debug1(1, "in %s retrieval function", "pHYs");
982
983 if (png_ptr != NULL && info_ptr != NULL &&
984 (info_ptr->valid & PNG_INFO_pHYs) != 0)
985 {
986 if (res_x != NULL)
987 {
988 *res_x = info_ptr->x_pixels_per_unit;
989 retval |= PNG_INFO_pHYs;
990 }
991
992 if (res_y != NULL)
993 {
994 *res_y = info_ptr->y_pixels_per_unit;
995 retval |= PNG_INFO_pHYs;
996 }
997
998 if (unit_type != NULL)
999 {
1000 *unit_type = (int)info_ptr->phys_unit_type;
1001 retval |= PNG_INFO_pHYs;
1002 }
1003 }
1004
1005 return (retval);
1006 }
1007 #endif /* pHYs */
1008
1009 png_uint_32 PNGAPI
1010 png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
1011 png_colorp *palette, int *num_palette)
1012 {
1013 png_debug1(1, "in %s retrieval function", "PLTE");
1014
1015 if (png_ptr != NULL && info_ptr != NULL &&
1016 (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
1017 {
1018 *palette = info_ptr->palette;
1019 *num_palette = info_ptr->num_palette;
1020 png_debug1(3, "num_palette = %d", *num_palette);
1021 return (PNG_INFO_PLTE);
1022 }
1023
1024 return (0);
1025 }
1026
1027 #ifdef PNG_sBIT_SUPPORTED
1028 png_uint_32 PNGAPI
1029 png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
1030 png_color_8p *sig_bit)
1031 {
1032 png_debug1(1, "in %s retrieval function", "sBIT");
1033
1034 if (png_ptr != NULL && info_ptr != NULL &&
1035 (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
1036 {
1037 *sig_bit = &(info_ptr->sig_bit);
1038 return (PNG_INFO_sBIT);
1039 }
1040
1041 return (0);
1042 }
1043 #endif
1044
1045 #ifdef PNG_TEXT_SUPPORTED
1046 int PNGAPI
1047 png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
1048 png_textp *text_ptr, int *num_text)
1049 {
1050 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
1051 {
1052 png_debug1(1, "in 0x%lx retrieval function",
1053 (unsigned long)png_ptr->chunk_name);
1054
1055 if (text_ptr != NULL)
1056 *text_ptr = info_ptr->text;
1057
1058 if (num_text != NULL)
1059 *num_text = info_ptr->num_text;
1060
1061 return info_ptr->num_text;
1062 }
1063
1064 if (num_text != NULL)
1065 *num_text = 0;
1066
1067 return(0);
1068 }
1069 #endif
1070
1071 #ifdef PNG_tIME_SUPPORTED
1072 png_uint_32 PNGAPI
1073 png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
1074 png_timep *mod_time)
1075 {
1076 png_debug1(1, "in %s retrieval function", "tIME");
1077
1078 if (png_ptr != NULL && info_ptr != NULL &&
1079 (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
1080 {
1081 *mod_time = &(info_ptr->mod_time);
1082 return (PNG_INFO_tIME);
1083 }
1084
1085 return (0);
1086 }
1087 #endif
1088
1089 #ifdef PNG_tRNS_SUPPORTED
1090 png_uint_32 PNGAPI
1091 png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
1092 png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
1093 {
1094 png_uint_32 retval = 0;
1095 if (png_ptr != NULL && info_ptr != NULL &&
1096 (info_ptr->valid & PNG_INFO_tRNS) != 0)
1097 {
1098 png_debug1(1, "in %s retrieval function", "tRNS");
1099
1100 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1101 {
1102 if (trans_alpha != NULL)
1103 {
1104 *trans_alpha = info_ptr->trans_alpha;
1105 retval |= PNG_INFO_tRNS;
1106 }
1107
1108 if (trans_color != NULL)
1109 *trans_color = &(info_ptr->trans_color);
1110 }
1111
1112 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
1113 {
1114 if (trans_color != NULL)
1115 {
1116 *trans_color = &(info_ptr->trans_color);
1117 retval |= PNG_INFO_tRNS;
1118 }
1119
1120 if (trans_alpha != NULL)
1121 *trans_alpha = NULL;
1122 }
1123
1124 if (num_trans != NULL)
1125 {
1126 *num_trans = info_ptr->num_trans;
1127 retval |= PNG_INFO_tRNS;
1128 }
1129 }
1130
1131 return (retval);
1132 }
1133 #endif
1134
1135 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1136 int PNGAPI
1137 png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
1138 png_unknown_chunkpp unknowns)
1139 {
1140 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
1141 {
1142 *unknowns = info_ptr->unknown_chunks;
1143 return info_ptr->unknown_chunks_num;
1144 }
1145
1146 return (0);
1147 }
1148 #endif
1149
1150 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1151 png_byte PNGAPI
1152 png_get_rgb_to_gray_status (png_const_structrp png_ptr)
1153 {
1154 return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
1155 }
1156 #endif
1157
1158 #ifdef PNG_USER_CHUNKS_SUPPORTED
1159 png_voidp PNGAPI
1160 png_get_user_chunk_ptr(png_const_structrp png_ptr)
1161 {
1162 return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
1163 }
1164 #endif
1165
1166 png_size_t PNGAPI
1167 png_get_compression_buffer_size(png_const_structrp png_ptr)
1168 {
1169 if (png_ptr == NULL)
1170 return 0;
1171
1172 #ifdef PNG_WRITE_SUPPORTED
1173 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1174 #endif
1175 {
1176 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1177 return png_ptr->IDAT_read_size;
1178 #else
1179 return PNG_IDAT_READ_SIZE;
1180 #endif
1181 }
1182
1183 #ifdef PNG_WRITE_SUPPORTED
1184 else
1185 return png_ptr->zbuffer_size;
1186 #endif
1187 }
1188
1189 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1190 /* These functions were added to libpng 1.2.6 and were enabled
1191 * by default in libpng-1.4.0 */
1192 png_uint_32 PNGAPI
1193 png_get_user_width_max (png_const_structrp png_ptr)
1194 {
1195 return (png_ptr ? png_ptr->user_width_max : 0);
1196 }
1197
1198 png_uint_32 PNGAPI
1199 png_get_user_height_max (png_const_structrp png_ptr)
1200 {
1201 return (png_ptr ? png_ptr->user_height_max : 0);
1202 }
1203
1204 /* This function was added to libpng 1.4.0 */
1205 png_uint_32 PNGAPI
1206 png_get_chunk_cache_max (png_const_structrp png_ptr)
1207 {
1208 return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
1209 }
1210
1211 /* This function was added to libpng 1.4.1 */
1212 png_alloc_size_t PNGAPI
1213 png_get_chunk_malloc_max (png_const_structrp png_ptr)
1214 {
1215 return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1216 }
1217 #endif /* SET_USER_LIMITS */
1218
1219 /* These functions were added to libpng 1.4.0 */
1220 #ifdef PNG_IO_STATE_SUPPORTED
1221 png_uint_32 PNGAPI
1222 png_get_io_state (png_const_structrp png_ptr)
1223 {
1224 return png_ptr->io_state;
1225 }
1226
1227 png_uint_32 PNGAPI
1228 png_get_io_chunk_type (png_const_structrp png_ptr)
1229 {
1230 return png_ptr->chunk_name;
1231 }
1232 #endif /* IO_STATE */
1233
1234 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1235 # ifdef PNG_GET_PALETTE_MAX_SUPPORTED
1236 int PNGAPI
1237 png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
1238 {
1239 if (png_ptr != NULL && info_ptr != NULL)
1240 return png_ptr->num_palette_max;
1241
1242 return (-1);
1243 }
1244 # endif
1245 #endif
1246
1247 #endif /* READ || WRITE */