325 lines
8.6 KiB
C
325 lines
8.6 KiB
C
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/* pngget.c - retrieval of values from info struct
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*
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* libpng 1.00.97
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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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* May 28, 1997
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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_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
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{
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if (info_ptr != NULL)
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return(info_ptr->valid & flag);
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else
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return(0);
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}
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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 (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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png_byte
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png_get_channels(png_structp png_ptr, png_infop info_ptr)
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{
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if (info_ptr != NULL)
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return(info_ptr->channels);
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else
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return(0);
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}
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png_bytep
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png_get_signature(png_structp png_ptr, png_infop info_ptr)
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{
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if (info_ptr != NULL)
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return(info_ptr->signature);
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else
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return(NULL);
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}
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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 (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 (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 (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, png_byte *file_srgb_intent)
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{
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if (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 = (png_byte)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 (info_ptr != NULL && info_ptr->valid & PNG_INFO_hIST && 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 (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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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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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 (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 (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 (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 && res_y != NULL)
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{
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*res_x = info_ptr->x_pixels_per_unit;
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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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return (retval);
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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_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 (info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE && 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 (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT && 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);
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return (PNG_INFO_sBIT);
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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_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
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png_uint_32
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png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
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int *num_text)
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{
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if ((info_ptr != NULL) || (info_ptr->num_text > 0))
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{
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png_debug1(1, "in %s retrieval function\n",
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(png_ptr->chunk_name[0] == '\0' ? "text" : png_ptr->chunk_name));
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if (text_ptr != NULL)
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*text_ptr = info_ptr->text;
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if (num_text != NULL)
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*num_text = info_ptr->num_text;
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return ((png_uint_32)info_ptr->num_text);
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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_tIME_SUPPORTED)
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png_uint_32
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png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
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{
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if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME && mod_time != NULL)
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{
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png_debug1(1, "in %s retrieval function\n", "tIME");
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*mod_time = &(info_ptr->mod_time);
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return (PNG_INFO_tIME);
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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_tRNS_SUPPORTED)
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png_uint_32
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png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
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png_bytep *trans, int *num_trans, png_color_16p *trans_values)
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{
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if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
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{
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png_debug1(1, "in %s retrieval function\n", "tRNS");
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if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE && trans != NULL)
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{
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*trans = info_ptr->trans;
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}
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else if (trans_values != NULL)
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{
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*trans_values = &(info_ptr->trans_values);
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}
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else
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{
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return (0);
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}
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*num_trans = info_ptr->num_trans;
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return (PNG_INFO_tRNS);
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}
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return (0);
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}
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#endif
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