2 /* pngget.c - retrieval of values from info struct
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.)
15 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
17 if (png_ptr != NULL && info_ptr != NULL)
18 return(info_ptr->valid & flag);
24 png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
26 if (png_ptr != NULL && info_ptr != NULL)
27 return(info_ptr->rowbytes);
32 #if defined(PNG_INFO_IMAGE_SUPPORTED)
34 png_get_rows(png_structp png_ptr, png_infop info_ptr)
36 if (png_ptr != NULL && info_ptr != NULL)
37 return(info_ptr->row_pointers);
43 #ifdef PNG_EASY_ACCESS_SUPPORTED
44 /* easy access to info, added in libpng-0.99 */
46 png_get_image_width(png_structp png_ptr, png_infop info_ptr)
48 if (png_ptr != NULL && info_ptr != NULL)
50 return info_ptr->width;
56 png_get_image_height(png_structp png_ptr, png_infop info_ptr)
58 if (png_ptr != NULL && info_ptr != NULL)
60 return info_ptr->height;
66 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
68 if (png_ptr != NULL && info_ptr != NULL)
70 return info_ptr->bit_depth;
76 png_get_color_type(png_structp png_ptr, png_infop info_ptr)
78 if (png_ptr != NULL && info_ptr != NULL)
80 return info_ptr->color_type;
86 png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
88 if (png_ptr != NULL && info_ptr != NULL)
90 return info_ptr->filter_type;
96 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
98 if (png_ptr != NULL && info_ptr != NULL)
100 return info_ptr->interlace_type;
106 png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
108 if (png_ptr != NULL && info_ptr != NULL)
110 return info_ptr->compression_type;
116 png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
118 if (png_ptr != NULL && info_ptr != NULL)
119 #if defined(PNG_pHYs_SUPPORTED)
120 if (info_ptr->valid & PNG_INFO_pHYs)
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)
125 else return (info_ptr->x_pixels_per_unit);
134 png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
136 if (png_ptr != NULL && info_ptr != NULL)
137 #if defined(PNG_pHYs_SUPPORTED)
138 if (info_ptr->valid & PNG_INFO_pHYs)
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)
143 else return (info_ptr->y_pixels_per_unit);
152 png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
154 if (png_ptr != NULL && info_ptr != NULL)
155 #if defined(PNG_pHYs_SUPPORTED)
156 if (info_ptr->valid & PNG_INFO_pHYs)
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)
162 else return (info_ptr->x_pixels_per_unit);
170 #ifdef PNG_FLOATING_POINT_SUPPORTED
172 png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
174 if (png_ptr != NULL && info_ptr != NULL)
175 #if defined(PNG_pHYs_SUPPORTED)
176 if (info_ptr->valid & PNG_INFO_pHYs)
178 png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
179 if (info_ptr->x_pixels_per_unit == 0)
182 return ((float)((float)info_ptr->y_pixels_per_unit
183 /(float)info_ptr->x_pixels_per_unit));
193 png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
195 if (png_ptr != NULL && info_ptr != NULL)
196 #if defined(PNG_oFFs_SUPPORTED)
197 if (info_ptr->valid & PNG_INFO_oFFs)
199 png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
200 if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
202 else return (info_ptr->x_offset);
211 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
213 if (png_ptr != NULL && info_ptr != NULL)
214 #if defined(PNG_oFFs_SUPPORTED)
215 if (info_ptr->valid & PNG_INFO_oFFs)
217 png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
218 if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
220 else return (info_ptr->y_offset);
229 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
231 if (png_ptr != NULL && info_ptr != NULL)
232 #if defined(PNG_oFFs_SUPPORTED)
233 if (info_ptr->valid & PNG_INFO_oFFs)
235 png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
236 if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
238 else return (info_ptr->x_offset);
247 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
249 if (png_ptr != NULL && info_ptr != NULL)
250 #if defined(PNG_oFFs_SUPPORTED)
251 if (info_ptr->valid & PNG_INFO_oFFs)
253 png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
254 if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
256 else return (info_ptr->y_offset);
264 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
266 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
268 return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
273 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
275 return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
280 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
282 return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
287 png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
289 return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
294 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
296 return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
300 #if defined(PNG_pHYs_SUPPORTED)
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)
305 png_uint_32 retval = 0;
307 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
309 png_debug1(1, "in %s retrieval function\n", "pHYs");
312 *res_x = info_ptr->x_pixels_per_unit;
313 retval |= PNG_INFO_pHYs;
317 *res_y = info_ptr->y_pixels_per_unit;
318 retval |= PNG_INFO_pHYs;
320 if (unit_type != NULL)
322 *unit_type = (int)info_ptr->phys_unit_type;
323 retval |= PNG_INFO_pHYs;
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);
333 #endif /* PNG_pHYs_SUPPORTED */
334 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
336 /* png_get_channels really belongs in here, too, but it's been around longer */
338 #endif /* PNG_EASY_ACCESS_SUPPORTED */
341 png_get_channels(png_structp png_ptr, png_infop info_ptr)
343 if (png_ptr != NULL && info_ptr != NULL)
344 return(info_ptr->channels);
350 png_get_signature(png_structp png_ptr, png_infop info_ptr)
352 if (png_ptr != NULL && info_ptr != NULL)
353 return(info_ptr->signature);
358 #if defined(PNG_bKGD_SUPPORTED)
360 png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
361 png_color_16p *background)
363 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
364 && background != NULL)
366 png_debug1(1, "in %s retrieval function\n", "bKGD");
367 *background = &(info_ptr->background);
368 return (PNG_INFO_bKGD);
374 #if defined(PNG_cHRM_SUPPORTED)
375 #ifdef PNG_FLOATING_POINT_SUPPORTED
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)
381 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
383 png_debug1(1, "in %s retrieval function\n", "cHRM");
385 *white_x = (double)info_ptr->x_white;
387 *white_y = (double)info_ptr->y_white;
389 *red_x = (double)info_ptr->x_red;
391 *red_y = (double)info_ptr->y_red;
393 *green_x = (double)info_ptr->x_green;
395 *green_y = (double)info_ptr->y_green;
397 *blue_x = (double)info_ptr->x_blue;
399 *blue_y = (double)info_ptr->y_blue;
400 return (PNG_INFO_cHRM);
405 #ifdef PNG_FIXED_POINT_SUPPORTED
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)
412 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
414 png_debug1(1, "in %s retrieval function\n", "cHRM");
416 *white_x = info_ptr->int_x_white;
418 *white_y = info_ptr->int_y_white;
420 *red_x = info_ptr->int_x_red;
422 *red_y = info_ptr->int_y_red;
424 *green_x = info_ptr->int_x_green;
426 *green_y = info_ptr->int_y_green;
428 *blue_x = info_ptr->int_x_blue;
430 *blue_y = info_ptr->int_y_blue;
431 return (PNG_INFO_cHRM);
438 #if defined(PNG_gAMA_SUPPORTED)
439 #ifdef PNG_FLOATING_POINT_SUPPORTED
441 png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
443 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
444 && file_gamma != NULL)
446 png_debug1(1, "in %s retrieval function\n", "gAMA");
447 *file_gamma = (double)info_ptr->gamma;
448 return (PNG_INFO_gAMA);
453 #ifdef PNG_FIXED_POINT_SUPPORTED
455 png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
456 png_fixed_point *int_file_gamma)
458 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
459 && int_file_gamma != NULL)
461 png_debug1(1, "in %s retrieval function\n", "gAMA");
462 *int_file_gamma = info_ptr->int_gamma;
463 return (PNG_INFO_gAMA);
470 #if defined(PNG_sRGB_SUPPORTED)
472 png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
474 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
475 && file_srgb_intent != NULL)
477 png_debug1(1, "in %s retrieval function\n", "sRGB");
478 *file_srgb_intent = (int)info_ptr->srgb_intent;
479 return (PNG_INFO_sRGB);
485 #if defined(PNG_iCCP_SUPPORTED)
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)
491 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
492 && name != NULL && profile != NULL && proflen != NULL)
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);
507 #if defined(PNG_sPLT_SUPPORTED)
509 png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
510 png_sPLT_tpp spalettes)
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);
518 #if defined(PNG_hIST_SUPPORTED)
520 png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
522 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
525 png_debug1(1, "in %s retrieval function\n", "hIST");
526 *hist = info_ptr->hist;
527 return (PNG_INFO_hIST);
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,
540 if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
541 bit_depth != NULL && color_type != NULL)
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;
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 - 7*8 /* rounding of width to multiple of 8 pixels */
569 - 8) /* extra max_pixel_depth pad */
572 "Width too large for libpng to process image data.");
579 #if defined(PNG_oFFs_SUPPORTED)
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)
584 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
585 && offset_x != NULL && offset_y != NULL && unit_type != NULL)
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);
597 #if defined(PNG_pCAL_SUPPORTED)
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)
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)
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);
621 #if defined(PNG_sCAL_SUPPORTED)
622 #ifdef PNG_FLOATING_POINT_SUPPORTED
624 png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
625 int *unit, double *width, double *height)
627 if (png_ptr != NULL && info_ptr != NULL &&
628 (info_ptr->valid & PNG_INFO_sCAL))
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);
638 #ifdef PNG_FIXED_POINT_SUPPORTED
640 png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
641 int *unit, png_charpp width, png_charpp height)
643 if (png_ptr != NULL && info_ptr != NULL &&
644 (info_ptr->valid & PNG_INFO_sCAL))
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);
657 #if defined(PNG_pHYs_SUPPORTED)
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)
662 png_uint_32 retval = 0;
664 if (png_ptr != NULL && info_ptr != NULL &&
665 (info_ptr->valid & PNG_INFO_pHYs))
667 png_debug1(1, "in %s retrieval function\n", "pHYs");
670 *res_x = info_ptr->x_pixels_per_unit;
671 retval |= PNG_INFO_pHYs;
675 *res_y = info_ptr->y_pixels_per_unit;
676 retval |= PNG_INFO_pHYs;
678 if (unit_type != NULL)
680 *unit_type = (int)info_ptr->phys_unit_type;
681 retval |= PNG_INFO_pHYs;
689 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
692 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
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);
704 #if defined(PNG_sBIT_SUPPORTED)
706 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
708 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
711 png_debug1(1, "in %s retrieval function\n", "sBIT");
712 *sig_bit = &(info_ptr->sig_bit);
713 return (PNG_INFO_sBIT);
719 #if defined(PNG_TEXT_SUPPORTED)
721 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
724 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
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);
735 if (num_text != NULL)
741 #if defined(PNG_tIME_SUPPORTED)
743 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
745 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
748 png_debug1(1, "in %s retrieval function\n", "tIME");
749 *mod_time = &(info_ptr->mod_time);
750 return (PNG_INFO_tIME);
756 #if defined(PNG_tRNS_SUPPORTED)
758 png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
759 png_bytep *trans, int *num_trans, png_color_16p *trans_values)
761 png_uint_32 retval = 0;
762 if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
764 png_debug1(1, "in %s retrieval function\n", "tRNS");
765 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
769 *trans = info_ptr->trans;
770 retval |= PNG_INFO_tRNS;
772 if (trans_values != NULL)
773 *trans_values = &(info_ptr->trans_values);
775 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
777 if (trans_values != NULL)
779 *trans_values = &(info_ptr->trans_values);
780 retval |= PNG_INFO_tRNS;
785 if(num_trans != NULL)
787 *num_trans = info_ptr->num_trans;
788 retval |= PNG_INFO_tRNS;
795 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
797 png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
798 png_unknown_chunkpp unknowns)
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);
806 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
808 png_get_rgb_to_gray_status (png_structp png_ptr)
810 return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
814 #if defined(PNG_USER_CHUNKS_SUPPORTED)
816 png_get_user_chunk_ptr(png_structp png_ptr)
818 return (png_ptr? png_ptr->user_chunk_ptr : NULL);
822 #ifdef PNG_WRITE_SUPPORTED
824 png_get_compression_buffer_size(png_structp png_ptr)
826 return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
831 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
832 /* this function was added to libpng 1.2.0 and should exist by default */
834 png_get_asm_flags (png_structp png_ptr)
836 return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
839 /* this function was added to libpng 1.2.0 and should exist by default */
841 png_get_asm_flagmask (int flag_select)
843 png_uint_32 settable_asm_flags = 0;
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 */
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] ;
862 return settable_asm_flags; /* _theoretically_ settable capabilities only */
864 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
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 */
871 png_get_mmx_flagmask (int flag_select, int *compilerID)
873 png_uint_32 settable_mmx_flags = 0;
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 ;
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] ;
890 if (compilerID != NULL) {
891 #ifdef PNG_USE_PNGVCRD
892 *compilerID = 1; /* MSVC */
894 #ifdef PNG_USE_PNGGCCRD
895 *compilerID = 2; /* gcc/gas */
897 *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */
902 return settable_mmx_flags; /* _theoretically_ settable capabilities only */
905 /* this function was added to libpng 1.2.0 */
907 png_get_mmx_bitdepth_threshold (png_structp png_ptr)
909 return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
912 /* this function was added to libpng 1.2.0 */
914 png_get_mmx_rowbytes_threshold (png_structp png_ptr)
916 return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
918 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
920 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
921 /* these functions were added to libpng 1.2.6 */
923 png_get_user_width_max (png_structp png_ptr)
925 return (png_ptr? png_ptr->user_width_max : 0);
928 png_get_user_height_max (png_structp png_ptr)
930 return (png_ptr? png_ptr->user_height_max : 0);
932 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
934 #endif /* ?PNG_1_0_X */