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553 lines
15 KiB
C
553 lines
15 KiB
C
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/* pngget.c - retrieval of values from info struct
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*
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* libpng 1.0.2 - June 14, 1998
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* Copyright (c) 1996, 1997 Andreas Dilger
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* Copyright (c) 1998, Glenn Randers-Pehrson
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*/
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#define PNG_INTERNAL
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#include "png.h"
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png_uint_32
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png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return(info_ptr->rowbytes);
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else
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return(0);
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}
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#ifdef PNG_EASY_ACCESS_SUPPORTED
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/* easy access to info, added in libpng-0.99 */
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png_uint_32
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png_get_image_width(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->width;
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}
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return (0);
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}
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png_uint_32
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png_get_image_height(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->height;
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}
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return (0);
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}
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png_byte
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png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->bit_depth;
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}
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return (0);
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}
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png_byte
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png_get_color_type(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->color_type;
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}
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return (0);
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}
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png_byte
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png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->filter_type;
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}
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return (0);
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}
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png_byte
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png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->interlace_type;
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}
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return (0);
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}
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png_byte
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png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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return info_ptr->compression_type;
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}
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return (0);
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}
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png_uint_32
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png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
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{
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png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
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if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
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return (0);
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else return (info_ptr->x_pixels_per_unit);
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}
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else
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#endif
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return (0);
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}
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png_uint_32
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png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
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{
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png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
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if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
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return (0);
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else return (info_ptr->y_pixels_per_unit);
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}
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else
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#endif
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return (0);
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}
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png_uint_32
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png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
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{
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png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
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if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
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info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
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return (0);
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else return (info_ptr->x_pixels_per_unit);
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}
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else
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#endif
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return (0);
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}
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float
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png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
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{
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png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
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if (info_ptr->x_pixels_per_unit == 0)
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return ((float)0.0);
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else
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return ((float)info_ptr->y_pixels_per_unit
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/(float)info_ptr->x_pixels_per_unit);
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}
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else
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#endif
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return ((float)0.0);
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}
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#ifdef PNG_INCH_CONVERSIONS
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png_uint_32
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png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
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{
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return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
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*.03937 +.5)
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}
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png_uint_32
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png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
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{
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return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
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*.03937 +.5)
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}
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png_uint_32
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png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
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{
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return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
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*.03937 +.5)
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}
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float
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png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
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{
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return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
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*.03937/1000000. +.5)
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}
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float
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png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
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{
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return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
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*.03937/1000000. +.5)
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}
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#if defined(PNG_READ_pHYs_SUPPORTED)
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png_uint_32
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png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
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png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
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{
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png_uint_32 retval = 0;
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if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
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{
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png_debug1(1, "in %s retrieval function\n", "pHYs");
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if (res_x != NULL)
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{
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*res_x = info_ptr->x_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (res_y != NULL)
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{
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*res_y = info_ptr->y_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (unit_type != NULL)
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{
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*unit_type = (int)info_ptr->phys_unit_type;
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retval |= PNG_INFO_pHYs;
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if(unit_type == 1)
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{
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if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
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if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
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}
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}
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}
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return (retval);
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}
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#endif /* PNG_READ_pHYs_SUPPORTED */
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#endif /* PNG_INCH_CONVERSIONS */
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/* png_get_channels really belongs in here, too, but it's been around longer */
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#endif /* PNG_EASY_ACCESS_SUPPORTED */
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#if defined(PNG_READ_bKGD_SUPPORTED)
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png_uint_32
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png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
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png_color_16p *background)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
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&& background != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "bKGD");
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*background = &(info_ptr->background);
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return (PNG_INFO_bKGD);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_cHRM_SUPPORTED)
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png_uint_32
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png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
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double *white_x, double *white_y, double *red_x, double *red_y,
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double *green_x, double *green_y, double *blue_x, double *blue_y)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
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{
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png_debug1(1, "in %s retrieval function\n", "cHRM");
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if (white_x != NULL)
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*white_x = (double)info_ptr->x_white;
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if (white_y != NULL)
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*white_y = (double)info_ptr->y_white;
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if (red_x != NULL)
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*red_x = (double)info_ptr->x_red;
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if (red_y != NULL)
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*red_y = (double)info_ptr->y_red;
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if (green_x != NULL)
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*green_x = (double)info_ptr->x_green;
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if (green_y != NULL)
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*green_y = (double)info_ptr->y_green;
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if (blue_x != NULL)
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*blue_x = (double)info_ptr->x_blue;
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if (blue_y != NULL)
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*blue_y = (double)info_ptr->y_blue;
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return (PNG_INFO_cHRM);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_gAMA_SUPPORTED)
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png_uint_32
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png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
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&& file_gamma != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "gAMA");
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*file_gamma = (double)info_ptr->gamma;
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return (PNG_INFO_gAMA);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_sRGB_SUPPORTED)
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png_uint_32
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png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
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&& file_srgb_intent != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "sRGB");
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*file_srgb_intent = (int)info_ptr->srgb_intent;
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return (PNG_INFO_sRGB);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_hIST_SUPPORTED)
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png_uint_32
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png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
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&& hist != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "hIST");
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*hist = info_ptr->hist;
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return (PNG_INFO_hIST);
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}
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return (0);
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}
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#endif
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png_uint_32
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png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
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png_uint_32 *width, png_uint_32 *height, int *bit_depth,
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int *color_type, int *interlace_type, int *compression_type,
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int *filter_type)
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{
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if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
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bit_depth != NULL && color_type != NULL)
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{
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int pixel_depth, channels;
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png_uint_32 rowbytes_per_pixel;
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png_debug1(1, "in %s retrieval function\n", "IHDR");
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*width = info_ptr->width;
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*height = info_ptr->height;
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*bit_depth = info_ptr->bit_depth;
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*color_type = info_ptr->color_type;
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if (compression_type != NULL)
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*compression_type = info_ptr->compression_type;
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if (filter_type != NULL)
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*filter_type = info_ptr->filter_type;
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if (interlace_type != NULL)
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*interlace_type = info_ptr->interlace_type;
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/* check for potential overflow of rowbytes */
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if (*color_type == PNG_COLOR_TYPE_PALETTE)
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channels = 1;
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else if (*color_type & PNG_COLOR_MASK_COLOR)
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channels = 3;
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else
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channels = 1;
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if (*color_type & PNG_COLOR_MASK_ALPHA)
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channels++;
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pixel_depth = *bit_depth * channels;
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rowbytes_per_pixel = (pixel_depth + 7) >> 3;
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if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel))
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{
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png_warning(png_ptr,
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"Width too large for libpng to process image data.");
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}
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return (1);
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}
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return (0);
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}
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#if defined(PNG_READ_oFFs_SUPPORTED)
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png_uint_32
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png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
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png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)
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{
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if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
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&& offset_x != NULL && offset_y != NULL && unit_type != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "oFFs");
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*offset_x = info_ptr->x_offset;
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*offset_y = info_ptr->y_offset;
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*unit_type = (int)info_ptr->offset_unit_type;
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return (PNG_INFO_oFFs);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_pCAL_SUPPORTED)
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png_uint_32
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png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
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png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
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png_charp *units, png_charpp *params)
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{
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if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
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purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
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nparams != NULL && units != NULL && params != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "pCAL");
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*purpose = info_ptr->pcal_purpose;
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*X0 = info_ptr->pcal_X0;
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*X1 = info_ptr->pcal_X1;
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*type = (int)info_ptr->pcal_type;
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*nparams = (int)info_ptr->pcal_nparams;
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*units = info_ptr->pcal_units;
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*params = info_ptr->pcal_params;
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return (PNG_INFO_pCAL);
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}
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return (0);
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}
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#endif
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#if defined(PNG_READ_pHYs_SUPPORTED)
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png_uint_32
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png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
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png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
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{
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png_uint_32 retval = 0;
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if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
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{
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png_debug1(1, "in %s retrieval function\n", "pHYs");
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if (res_x != NULL)
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{
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*res_x = info_ptr->x_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (res_y != NULL)
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{
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*res_y = info_ptr->y_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (unit_type != NULL)
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{
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*unit_type = (int)info_ptr->phys_unit_type;
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retval |= PNG_INFO_pHYs;
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}
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}
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return (retval);
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}
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#endif
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png_uint_32
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png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
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int *num_palette)
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{
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if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
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palette != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "PLTE");
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*palette = info_ptr->palette;
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*num_palette = info_ptr->num_palette;
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png_debug1(3, "num_palette = %d\n", *num_palette);
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return (PNG_INFO_PLTE);
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}
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return (0);
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}
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#if defined(PNG_READ_sBIT_SUPPORTED)
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png_uint_32
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png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
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{
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if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
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sig_bit != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "sBIT");
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|
*sig_bit = &(info_ptr->sig_bit);
|
|
return (PNG_INFO_sBIT);
|
|
}
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
|
|
png_uint_32
|
|
png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
|
|
int *num_text)
|
|
{
|
|
if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
|
|
{
|
|
png_debug1(1, "in %s retrieval function\n",
|
|
(png_ptr->chunk_name[0] == '\0' ? "text"
|
|
: (png_const_charp)png_ptr->chunk_name));
|
|
if (text_ptr != NULL)
|
|
*text_ptr = info_ptr->text;
|
|
if (num_text != NULL)
|
|
*num_text = info_ptr->num_text;
|
|
return ((png_uint_32)info_ptr->num_text);
|
|
}
|
|
return(0);
|
|
}
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
png_uint_32
|
|
png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
|
|
{
|
|
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
|
|
mod_time != NULL)
|
|
{
|
|
png_debug1(1, "in %s retrieval function\n", "tIME");
|
|
*mod_time = &(info_ptr->mod_time);
|
|
return (PNG_INFO_tIME);
|
|
}
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
png_uint_32
|
|
png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
|
|
png_bytep *trans, int *num_trans, png_color_16p *trans_values)
|
|
{
|
|
png_uint_32 retval = 0;
|
|
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
|
|
{
|
|
png_debug1(1, "in %s retrieval function\n", "tRNS");
|
|
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
{
|
|
if (trans != NULL)
|
|
{
|
|
*trans = info_ptr->trans;
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
if (trans_values != NULL)
|
|
*trans_values = &(info_ptr->trans_values);
|
|
}
|
|
else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
|
|
{
|
|
if (trans_values != NULL)
|
|
{
|
|
*trans_values = &(info_ptr->trans_values);
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
if(trans != NULL)
|
|
*trans = NULL;
|
|
}
|
|
if(num_trans != NULL)
|
|
{
|
|
*num_trans = info_ptr->num_trans;
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
}
|
|
return (retval);
|
|
}
|
|
#endif
|
|
|
|
|