pngget.c@ 7692

Last change on this file since 7692 was 6393, checked in by vboxsync, 17 years ago
export libpng and zlib so Windows and OS/2 builds cleanly.
Property svn:eol-style set to `native`
File size: 25.4 KB

Line
1
2	/* pngget.c - retrieval of values from info struct
3	*
4	* libpng 1.2.8 - December 3, 2004
5	* For conditions of distribution and use, see copyright notice in png.h
6	* Copyright (c) 1998-2004 Glenn Randers-Pehrson
7	* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8	* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9	*/
10
11	#define PNG_INTERNAL
12	#include "png.h"
13
14	png_uint_32 PNGAPI
15	png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
16	{
17	if (png_ptr != NULL && info_ptr != NULL)
18	return(info_ptr->valid & flag);
19	else
20	return(0);
21	}
22
23	png_uint_32 PNGAPI
24	png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
25	{
26	if (png_ptr != NULL && info_ptr != NULL)
27	return(info_ptr->rowbytes);
28	else
29	return(0);
30	}
31
32	#if defined(PNG_INFO_IMAGE_SUPPORTED)
33	png_bytepp PNGAPI
34	png_get_rows(png_structp png_ptr, png_infop info_ptr)
35	{
36	if (png_ptr != NULL && info_ptr != NULL)
37	return(info_ptr->row_pointers);
38	else
39	return(0);
40	}
41	#endif
42
43	#ifdef PNG_EASY_ACCESS_SUPPORTED
44	/* easy access to info, added in libpng-0.99 */
45	png_uint_32 PNGAPI
46	png_get_image_width(png_structp png_ptr, png_infop info_ptr)
47	{
48	if (png_ptr != NULL && info_ptr != NULL)
49	{
50	return info_ptr->width;
51	}
52	return (0);
53	}
54
55	png_uint_32 PNGAPI
56	png_get_image_height(png_structp png_ptr, png_infop info_ptr)
57	{
58	if (png_ptr != NULL && info_ptr != NULL)
59	{
60	return info_ptr->height;
61	}
62	return (0);
63	}
64
65	png_byte PNGAPI
66	png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
67	{
68	if (png_ptr != NULL && info_ptr != NULL)
69	{
70	return info_ptr->bit_depth;
71	}
72	return (0);
73	}
74
75	png_byte PNGAPI
76	png_get_color_type(png_structp png_ptr, png_infop info_ptr)
77	{
78	if (png_ptr != NULL && info_ptr != NULL)
79	{
80	return info_ptr->color_type;
81	}
82	return (0);
83	}
84
85	png_byte PNGAPI
86	png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
87	{
88	if (png_ptr != NULL && info_ptr != NULL)
89	{
90	return info_ptr->filter_type;
91	}
92	return (0);
93	}
94
95	png_byte PNGAPI
96	png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
97	{
98	if (png_ptr != NULL && info_ptr != NULL)
99	{
100	return info_ptr->interlace_type;
101	}
102	return (0);
103	}
104
105	png_byte PNGAPI
106	png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
107	{
108	if (png_ptr != NULL && info_ptr != NULL)
109	{
110	return info_ptr->compression_type;
111	}
112	return (0);
113	}
114
115	png_uint_32 PNGAPI
116	png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
117	{
118	if (png_ptr != NULL && info_ptr != NULL)
119	#if defined(PNG_pHYs_SUPPORTED)
120	if (info_ptr->valid & PNG_INFO_pHYs)
121	{
122	png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
123	if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
124	return (0);
125	else return (info_ptr->x_pixels_per_unit);
126	}
127	#else
128	return (0);
129	#endif
130	return (0);
131	}
132
133	png_uint_32 PNGAPI
134	png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
135	{
136	if (png_ptr != NULL && info_ptr != NULL)
137	#if defined(PNG_pHYs_SUPPORTED)
138	if (info_ptr->valid & PNG_INFO_pHYs)
139	{
140	png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
141	if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
142	return (0);
143	else return (info_ptr->y_pixels_per_unit);
144	}
145	#else
146	return (0);
147	#endif
148	return (0);
149	}
150
151	png_uint_32 PNGAPI
152	png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
153	{
154	if (png_ptr != NULL && info_ptr != NULL)
155	#if defined(PNG_pHYs_SUPPORTED)
156	if (info_ptr->valid & PNG_INFO_pHYs)
157	{
158	png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
159	if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER \|\|
160	info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
161	return (0);
162	else return (info_ptr->x_pixels_per_unit);
163	}
164	#else
165	return (0);
166	#endif
167	return (0);
168	}
169
170	#ifdef PNG_FLOATING_POINT_SUPPORTED
171	float PNGAPI
172	png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
173	{
174	if (png_ptr != NULL && info_ptr != NULL)
175	#if defined(PNG_pHYs_SUPPORTED)
176	if (info_ptr->valid & PNG_INFO_pHYs)
177	{
178	png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
179	if (info_ptr->x_pixels_per_unit == 0)
180	return ((float)0.0);
181	else
182	return ((float)((float)info_ptr->y_pixels_per_unit
183	/(float)info_ptr->x_pixels_per_unit));
184	}
185	#else
186	return (0.0);
187	#endif
188	return ((float)0.0);
189	}
190	#endif
191
192	png_int_32 PNGAPI
193	png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
194	{
195	if (png_ptr != NULL && info_ptr != NULL)
196	#if defined(PNG_oFFs_SUPPORTED)
197	if (info_ptr->valid & PNG_INFO_oFFs)
198	{
199	png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
200	if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
201	return (0);
202	else return (info_ptr->x_offset);
203	}
204	#else
205	return (0);
206	#endif
207	return (0);
208	}
209
210	png_int_32 PNGAPI
211	png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
212	{
213	if (png_ptr != NULL && info_ptr != NULL)
214	#if defined(PNG_oFFs_SUPPORTED)
215	if (info_ptr->valid & PNG_INFO_oFFs)
216	{
217	png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
218	if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
219	return (0);
220	else return (info_ptr->y_offset);
221	}
222	#else
223	return (0);
224	#endif
225	return (0);
226	}
227
228	png_int_32 PNGAPI
229	png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
230	{
231	if (png_ptr != NULL && info_ptr != NULL)
232	#if defined(PNG_oFFs_SUPPORTED)
233	if (info_ptr->valid & PNG_INFO_oFFs)
234	{
235	png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
236	if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
237	return (0);
238	else return (info_ptr->x_offset);
239	}
240	#else
241	return (0);
242	#endif
243	return (0);
244	}
245
246	png_int_32 PNGAPI
247	png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
248	{
249	if (png_ptr != NULL && info_ptr != NULL)
250	#if defined(PNG_oFFs_SUPPORTED)
251	if (info_ptr->valid & PNG_INFO_oFFs)
252	{
253	png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
254	if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
255	return (0);
256	else return (info_ptr->y_offset);
257	}
258	#else
259	return (0);
260	#endif
261	return (0);
262	}
263
264	#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
265	png_uint_32 PNGAPI
266	png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
267	{
268	return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
269	*.0254 +.5));
270	}
271
272	png_uint_32 PNGAPI
273	png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
274	{
275	return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
276	*.0254 +.5));
277	}
278
279	png_uint_32 PNGAPI
280	png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
281	{
282	return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
283	*.0254 +.5));
284	}
285
286	float PNGAPI
287	png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
288	{
289	return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
290	*.00003937);
291	}
292
293	float PNGAPI
294	png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
295	{
296	return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
297	*.00003937);
298	}
299
300	#if defined(PNG_pHYs_SUPPORTED)
301	png_uint_32 PNGAPI
302	png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
303	png_uint_32 res_x, png_uint_32 res_y, int *unit_type)
304	{
305	png_uint_32 retval = 0;
306
307	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
308	{
309	png_debug1(1, "in %s retrieval function\n", "pHYs");
310	if (res_x != NULL)
311	{
312	*res_x = info_ptr->x_pixels_per_unit;
313	retval \|= PNG_INFO_pHYs;
314	}
315	if (res_y != NULL)
316	{
317	*res_y = info_ptr->y_pixels_per_unit;
318	retval \|= PNG_INFO_pHYs;
319	}
320	if (unit_type != NULL)
321	{
322	*unit_type = (int)info_ptr->phys_unit_type;
323	retval \|= PNG_INFO_pHYs;
324	if(*unit_type == 1)
325	{
326	if (res_x != NULL) res_x = (png_uint_32)(res_x * .0254 + .50);
327	if (res_y != NULL) res_y = (png_uint_32)(res_y * .0254 + .50);
328	}
329	}
330	}
331	return (retval);
332	}
333	#endif /* PNG_pHYs_SUPPORTED */
334	#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
335
336	/* png_get_channels really belongs in here, too, but it's been around longer */
337
338	#endif /* PNG_EASY_ACCESS_SUPPORTED */
339
340	png_byte PNGAPI
341	png_get_channels(png_structp png_ptr, png_infop info_ptr)
342	{
343	if (png_ptr != NULL && info_ptr != NULL)
344	return(info_ptr->channels);
345	else
346	return (0);
347	}
348
349	png_bytep PNGAPI
350	png_get_signature(png_structp png_ptr, png_infop info_ptr)
351	{
352	if (png_ptr != NULL && info_ptr != NULL)
353	return(info_ptr->signature);
354	else
355	return (NULL);
356	}
357
358	#if defined(PNG_bKGD_SUPPORTED)
359	png_uint_32 PNGAPI
360	png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
361	png_color_16p *background)
362	{
363	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
364	&& background != NULL)
365	{
366	png_debug1(1, "in %s retrieval function\n", "bKGD");
367	*background = &(info_ptr->background);
368	return (PNG_INFO_bKGD);
369	}
370	return (0);
371	}
372	#endif
373
374	#if defined(PNG_cHRM_SUPPORTED)
375	#ifdef PNG_FLOATING_POINT_SUPPORTED
376	png_uint_32 PNGAPI
377	png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
378	double white_x, double white_y, double red_x, double red_y,
379	double green_x, double green_y, double blue_x, double blue_y)
380	{
381	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
382	{
383	png_debug1(1, "in %s retrieval function\n", "cHRM");
384	if (white_x != NULL)
385	*white_x = (double)info_ptr->x_white;
386	if (white_y != NULL)
387	*white_y = (double)info_ptr->y_white;
388	if (red_x != NULL)
389	*red_x = (double)info_ptr->x_red;
390	if (red_y != NULL)
391	*red_y = (double)info_ptr->y_red;
392	if (green_x != NULL)
393	*green_x = (double)info_ptr->x_green;
394	if (green_y != NULL)
395	*green_y = (double)info_ptr->y_green;
396	if (blue_x != NULL)
397	*blue_x = (double)info_ptr->x_blue;
398	if (blue_y != NULL)
399	*blue_y = (double)info_ptr->y_blue;
400	return (PNG_INFO_cHRM);
401	}
402	return (0);
403	}
404	#endif
405	#ifdef PNG_FIXED_POINT_SUPPORTED
406	png_uint_32 PNGAPI
407	png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
408	png_fixed_point white_x, png_fixed_point white_y, png_fixed_point *red_x,
409	png_fixed_point red_y, png_fixed_point green_x, png_fixed_point *green_y,
410	png_fixed_point blue_x, png_fixed_point blue_y)
411	{
412	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
413	{
414	png_debug1(1, "in %s retrieval function\n", "cHRM");
415	if (white_x != NULL)
416	*white_x = info_ptr->int_x_white;
417	if (white_y != NULL)
418	*white_y = info_ptr->int_y_white;
419	if (red_x != NULL)
420	*red_x = info_ptr->int_x_red;
421	if (red_y != NULL)
422	*red_y = info_ptr->int_y_red;
423	if (green_x != NULL)
424	*green_x = info_ptr->int_x_green;
425	if (green_y != NULL)
426	*green_y = info_ptr->int_y_green;
427	if (blue_x != NULL)
428	*blue_x = info_ptr->int_x_blue;
429	if (blue_y != NULL)
430	*blue_y = info_ptr->int_y_blue;
431	return (PNG_INFO_cHRM);
432	}
433	return (0);
434	}
435	#endif
436	#endif
437
438	#if defined(PNG_gAMA_SUPPORTED)
439	#ifdef PNG_FLOATING_POINT_SUPPORTED
440	png_uint_32 PNGAPI
441	png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
442	{
443	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
444	&& file_gamma != NULL)
445	{
446	png_debug1(1, "in %s retrieval function\n", "gAMA");
447	*file_gamma = (double)info_ptr->gamma;
448	return (PNG_INFO_gAMA);
449	}
450	return (0);
451	}
452	#endif
453	#ifdef PNG_FIXED_POINT_SUPPORTED
454	png_uint_32 PNGAPI
455	png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
456	png_fixed_point *int_file_gamma)
457	{
458	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
459	&& int_file_gamma != NULL)
460	{
461	png_debug1(1, "in %s retrieval function\n", "gAMA");
462	*int_file_gamma = info_ptr->int_gamma;
463	return (PNG_INFO_gAMA);
464	}
465	return (0);
466	}
467	#endif
468	#endif
469
470	#if defined(PNG_sRGB_SUPPORTED)
471	png_uint_32 PNGAPI
472	png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
473	{
474	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
475	&& file_srgb_intent != NULL)
476	{
477	png_debug1(1, "in %s retrieval function\n", "sRGB");
478	*file_srgb_intent = (int)info_ptr->srgb_intent;
479	return (PNG_INFO_sRGB);
480	}
481	return (0);
482	}
483	#endif
484
485	#if defined(PNG_iCCP_SUPPORTED)
486	png_uint_32 PNGAPI
487	png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
488	png_charpp name, int *compression_type,
489	png_charpp profile, png_uint_32 *proflen)
490	{
491	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
492	&& name != NULL && profile != NULL && proflen != NULL)
493	{
494	png_debug1(1, "in %s retrieval function\n", "iCCP");
495	*name = info_ptr->iccp_name;
496	*profile = info_ptr->iccp_profile;
497	/* compression_type is a dummy so the API won't have to change
498	if we introduce multiple compression types later. */
499	*proflen = (int)info_ptr->iccp_proflen;
500	*compression_type = (int)info_ptr->iccp_compression;
501	return (PNG_INFO_iCCP);
502	}
503	return (0);
504	}
505	#endif
506
507	#if defined(PNG_sPLT_SUPPORTED)
508	png_uint_32 PNGAPI
509	png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
510	png_sPLT_tpp spalettes)
511	{
512	if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
513	*spalettes = info_ptr->splt_palettes;
514	return ((png_uint_32)info_ptr->splt_palettes_num);
515	}
516	#endif
517
518	#if defined(PNG_hIST_SUPPORTED)
519	png_uint_32 PNGAPI
520	png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
521	{
522	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
523	&& hist != NULL)
524	{
525	png_debug1(1, "in %s retrieval function\n", "hIST");
526	*hist = info_ptr->hist;
527	return (PNG_INFO_hIST);
528	}
529	return (0);
530	}
531	#endif
532
533	png_uint_32 PNGAPI
534	png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
535	png_uint_32 width, png_uint_32 height, int *bit_depth,
536	int color_type, int interlace_type, int *compression_type,
537	int *filter_type)
538
539	{
540	if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
541	bit_depth != NULL && color_type != NULL)
542	{
543	png_debug1(1, "in %s retrieval function\n", "IHDR");
544	*width = info_ptr->width;
545	*height = info_ptr->height;
546	*bit_depth = info_ptr->bit_depth;
547	if (info_ptr->bit_depth < 1 \|\| info_ptr->bit_depth > 16)
548	png_error(png_ptr, "Invalid bit depth");
549	*color_type = info_ptr->color_type;
550	if (info_ptr->color_type > 6)
551	png_error(png_ptr, "Invalid color type");
552	if (compression_type != NULL)
553	*compression_type = info_ptr->compression_type;
554	if (filter_type != NULL)
555	*filter_type = info_ptr->filter_type;
556	if (interlace_type != NULL)
557	*interlace_type = info_ptr->interlace_type;
558
559	/* check for potential overflow of rowbytes */
560	if (width == 0 \|\| width > PNG_UINT_31_MAX)
561	png_error(png_ptr, "Invalid image width");
562	if (height == 0 \|\| height > PNG_UINT_31_MAX)
563	png_error(png_ptr, "Invalid image height");
564	if (info_ptr->width > (PNG_UINT_32_MAX
565	>> 3) /* 8-byte RGBA pixels */
566	- 64 /* bigrowbuf hack */
567	- 1 /* filter byte */
568	- 78 / rounding of width to multiple of 8 pixels */
569	- 8) /* extra max_pixel_depth pad */
570	{
571	png_warning(png_ptr,
572	"Width too large for libpng to process image data.");
573	}
574	return (1);
575	}
576	return (0);
577	}
578
579	#if defined(PNG_oFFs_SUPPORTED)
580	png_uint_32 PNGAPI
581	png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
582	png_int_32 offset_x, png_int_32 offset_y, int *unit_type)
583	{
584	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
585	&& offset_x != NULL && offset_y != NULL && unit_type != NULL)
586	{
587	png_debug1(1, "in %s retrieval function\n", "oFFs");
588	*offset_x = info_ptr->x_offset;
589	*offset_y = info_ptr->y_offset;
590	*unit_type = (int)info_ptr->offset_unit_type;
591	return (PNG_INFO_oFFs);
592	}
593	return (0);
594	}
595	#endif
596
597	#if defined(PNG_pCAL_SUPPORTED)
598	png_uint_32 PNGAPI
599	png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
600	png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int *nparams,
601	png_charp units, png_charpp params)
602	{
603	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
604	&& purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
605	nparams != NULL && units != NULL && params != NULL)
606	{
607	png_debug1(1, "in %s retrieval function\n", "pCAL");
608	*purpose = info_ptr->pcal_purpose;
609	*X0 = info_ptr->pcal_X0;
610	*X1 = info_ptr->pcal_X1;
611	*type = (int)info_ptr->pcal_type;
612	*nparams = (int)info_ptr->pcal_nparams;
613	*units = info_ptr->pcal_units;
614	*params = info_ptr->pcal_params;
615	return (PNG_INFO_pCAL);
616	}
617	return (0);
618	}
619	#endif
620
621	#if defined(PNG_sCAL_SUPPORTED)
622	#ifdef PNG_FLOATING_POINT_SUPPORTED
623	png_uint_32 PNGAPI
624	png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
625	int unit, double width, double *height)
626	{
627	if (png_ptr != NULL && info_ptr != NULL &&
628	(info_ptr->valid & PNG_INFO_sCAL))
629	{
630	*unit = info_ptr->scal_unit;
631	*width = info_ptr->scal_pixel_width;
632	*height = info_ptr->scal_pixel_height;
633	return (PNG_INFO_sCAL);
634	}
635	return(0);
636	}
637	#else
638	#ifdef PNG_FIXED_POINT_SUPPORTED
639	png_uint_32 PNGAPI
640	png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
641	int *unit, png_charpp width, png_charpp height)
642	{
643	if (png_ptr != NULL && info_ptr != NULL &&
644	(info_ptr->valid & PNG_INFO_sCAL))
645	{
646	*unit = info_ptr->scal_unit;
647	*width = info_ptr->scal_s_width;
648	*height = info_ptr->scal_s_height;
649	return (PNG_INFO_sCAL);
650	}
651	return(0);
652	}
653	#endif
654	#endif
655	#endif
656
657	#if defined(PNG_pHYs_SUPPORTED)
658	png_uint_32 PNGAPI
659	png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
660	png_uint_32 res_x, png_uint_32 res_y, int *unit_type)
661	{
662	png_uint_32 retval = 0;
663
664	if (png_ptr != NULL && info_ptr != NULL &&
665	(info_ptr->valid & PNG_INFO_pHYs))
666	{
667	png_debug1(1, "in %s retrieval function\n", "pHYs");
668	if (res_x != NULL)
669	{
670	*res_x = info_ptr->x_pixels_per_unit;
671	retval \|= PNG_INFO_pHYs;
672	}
673	if (res_y != NULL)
674	{
675	*res_y = info_ptr->y_pixels_per_unit;
676	retval \|= PNG_INFO_pHYs;
677	}
678	if (unit_type != NULL)
679	{
680	*unit_type = (int)info_ptr->phys_unit_type;
681	retval \|= PNG_INFO_pHYs;
682	}
683	}
684	return (retval);
685	}
686	#endif
687
688	png_uint_32 PNGAPI
689	png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
690	int *num_palette)
691	{
692	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
693	&& palette != NULL)
694	{
695	png_debug1(1, "in %s retrieval function\n", "PLTE");
696	*palette = info_ptr->palette;
697	*num_palette = info_ptr->num_palette;
698	png_debug1(3, "num_palette = %d\n", *num_palette);
699	return (PNG_INFO_PLTE);
700	}
701	return (0);
702	}
703
704	#if defined(PNG_sBIT_SUPPORTED)
705	png_uint_32 PNGAPI
706	png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
707	{
708	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
709	&& sig_bit != NULL)
710	{
711	png_debug1(1, "in %s retrieval function\n", "sBIT");
712	*sig_bit = &(info_ptr->sig_bit);
713	return (PNG_INFO_sBIT);
714	}
715	return (0);
716	}
717	#endif
718
719	#if defined(PNG_TEXT_SUPPORTED)
720	png_uint_32 PNGAPI
721	png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
722	int *num_text)
723	{
724	if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
725	{
726	png_debug1(1, "in %s retrieval function\n",
727	(png_ptr->chunk_name[0] == '\0' ? "text"
728	: (png_const_charp)png_ptr->chunk_name));
729	if (text_ptr != NULL)
730	*text_ptr = info_ptr->text;
731	if (num_text != NULL)
732	*num_text = info_ptr->num_text;
733	return ((png_uint_32)info_ptr->num_text);
734	}
735	if (num_text != NULL)
736	*num_text = 0;
737	return(0);
738	}
739	#endif
740
741	#if defined(PNG_tIME_SUPPORTED)
742	png_uint_32 PNGAPI
743	png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
744	{
745	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
746	&& mod_time != NULL)
747	{
748	png_debug1(1, "in %s retrieval function\n", "tIME");
749	*mod_time = &(info_ptr->mod_time);
750	return (PNG_INFO_tIME);
751	}
752	return (0);
753	}
754	#endif
755
756	#if defined(PNG_tRNS_SUPPORTED)
757	png_uint_32 PNGAPI
758	png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
759	png_bytep trans, int num_trans, png_color_16p *trans_values)
760	{
761	png_uint_32 retval = 0;
762	if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
763	{
764	png_debug1(1, "in %s retrieval function\n", "tRNS");
765	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
766	{
767	if (trans != NULL)
768	{
769	*trans = info_ptr->trans;
770	retval \|= PNG_INFO_tRNS;
771	}
772	if (trans_values != NULL)
773	*trans_values = &(info_ptr->trans_values);
774	}
775	else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
776	{
777	if (trans_values != NULL)
778	{
779	*trans_values = &(info_ptr->trans_values);
780	retval \|= PNG_INFO_tRNS;
781	}
782	if(trans != NULL)
783	*trans = NULL;
784	}
785	if(num_trans != NULL)
786	{
787	*num_trans = info_ptr->num_trans;
788	retval \|= PNG_INFO_tRNS;
789	}
790	}
791	return (retval);
792	}
793	#endif
794
795	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
796	png_uint_32 PNGAPI
797	png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
798	png_unknown_chunkpp unknowns)
799	{
800	if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
801	*unknowns = info_ptr->unknown_chunks;
802	return ((png_uint_32)info_ptr->unknown_chunks_num);
803	}
804	#endif
805
806	#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
807	png_byte PNGAPI
808	png_get_rgb_to_gray_status (png_structp png_ptr)
809	{
810	return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
811	}
812	#endif
813
814	#if defined(PNG_USER_CHUNKS_SUPPORTED)
815	png_voidp PNGAPI
816	png_get_user_chunk_ptr(png_structp png_ptr)
817	{
818	return (png_ptr? png_ptr->user_chunk_ptr : NULL);
819	}
820	#endif
821
822	#ifdef PNG_WRITE_SUPPORTED
823	png_uint_32 PNGAPI
824	png_get_compression_buffer_size(png_structp png_ptr)
825	{
826	return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
827	}
828	#endif
829
830	#ifndef PNG_1_0_X
831	#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
832	/* this function was added to libpng 1.2.0 and should exist by default */
833	png_uint_32 PNGAPI
834	png_get_asm_flags (png_structp png_ptr)
835	{
836	return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
837	}
838
839	/* this function was added to libpng 1.2.0 and should exist by default */
840	png_uint_32 PNGAPI
841	png_get_asm_flagmask (int flag_select)
842	{
843	png_uint_32 settable_asm_flags = 0;
844
845	if (flag_select & PNG_SELECT_READ)
846	settable_asm_flags \|=
847	PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \|
848	PNG_ASM_FLAG_MMX_READ_INTERLACE \|
849	PNG_ASM_FLAG_MMX_READ_FILTER_SUB \|
850	PNG_ASM_FLAG_MMX_READ_FILTER_UP \|
851	PNG_ASM_FLAG_MMX_READ_FILTER_AVG \|
852	PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
853	/* no non-MMX flags yet */
854
855	#if 0
856	/* GRR: no write-flags yet, either, but someday... */
857	if (flag_select & PNG_SELECT_WRITE)
858	settable_asm_flags \|=
859	PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
860	#endif /* 0 */
861
862	return settable_asm_flags; /* _theoretically_ settable capabilities only */
863	}
864	#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
865
866
867	#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
868	/* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
869	/* this function was added to libpng 1.2.0 */
870	png_uint_32 PNGAPI
871	png_get_mmx_flagmask (int flag_select, int *compilerID)
872	{
873	png_uint_32 settable_mmx_flags = 0;
874
875	if (flag_select & PNG_SELECT_READ)
876	settable_mmx_flags \|=
877	PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \|
878	PNG_ASM_FLAG_MMX_READ_INTERLACE \|
879	PNG_ASM_FLAG_MMX_READ_FILTER_SUB \|
880	PNG_ASM_FLAG_MMX_READ_FILTER_UP \|
881	PNG_ASM_FLAG_MMX_READ_FILTER_AVG \|
882	PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
883	#if 0
884	/* GRR: no MMX write support yet, but someday... */
885	if (flag_select & PNG_SELECT_WRITE)
886	settable_mmx_flags \|=
887	PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
888	#endif /* 0 */
889
890	if (compilerID != NULL) {
891	#ifdef PNG_USE_PNGVCRD
892	compilerID = 1; / MSVC */
893	#else
894	#ifdef PNG_USE_PNGGCCRD
895	compilerID = 2; / gcc/gas */
896	#else
897	compilerID = -1; / unknown (i.e., no asm/MMX code compiled) */
898	#endif
899	#endif
900	}
901
902	return settable_mmx_flags; /* _theoretically_ settable capabilities only */
903	}
904
905	/* this function was added to libpng 1.2.0 */
906	png_byte PNGAPI
907	png_get_mmx_bitdepth_threshold (png_structp png_ptr)
908	{
909	return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
910	}
911
912	/* this function was added to libpng 1.2.0 */
913	png_uint_32 PNGAPI
914	png_get_mmx_rowbytes_threshold (png_structp png_ptr)
915	{
916	return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
917	}
918	#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
919
920	#ifdef PNG_SET_USER_LIMITS_SUPPORTED
921	/* these functions were added to libpng 1.2.6 */
922	png_uint_32 PNGAPI
923	png_get_user_width_max (png_structp png_ptr)
924	{
925	return (png_ptr? png_ptr->user_width_max : 0);
926	}
927	png_uint_32 PNGAPI
928	png_get_user_height_max (png_structp png_ptr)
929	{
930	return (png_ptr? png_ptr->user_height_max : 0);
931	}
932	#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
933
934	#endif /* ?PNG_1_0_X */

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source: vbox/trunk/src/libs/libpng-1.2.8/pngget.c@ 7692

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