mirror of
https://frontier.innolan.net/github/AmigaExamples.git
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121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*
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* Orginal copyright from libpng example code
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*
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* Copyright 2002-2011 Guillaume Cottenceau and contributors.
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*
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* This software may be freely redistributed under the terms
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* of the X11 license.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <png.h>
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#include "imagecon.h"
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void
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png_read(char* file_name, imagecon_image_t* ic)
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{
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png_structp png_ptr;
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png_byte color_type;
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png_byte bit_depth;
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png_infop info_ptr;
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int number_of_passes, rowbytes;
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unsigned char header[8]; // 8 is the maximum size that can be checked
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/* open file and test for it being a png */
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FILE *fp = fopen(file_name, "rb");
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if (!fp)
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abort_("Failed to open %s", file_name);
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fread(header, 1, 8, fp);
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if (png_sig_cmp(header, 0, 8))
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abort_("File %s is not recognized as a PNG file", file_name);
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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abort_("png_create_read_struct failed");
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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abort_("png_create_info_struct failed");
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if (setjmp(png_jmpbuf(png_ptr)))
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abort_("Error during init_io");
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png_init_io(png_ptr, fp);
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png_set_sig_bytes(png_ptr, 8);
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png_read_info(png_ptr, info_ptr);
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ic->width = png_get_image_width(png_ptr, info_ptr);
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ic->height = png_get_image_height(png_ptr, info_ptr);
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color_type = png_get_color_type(png_ptr, info_ptr);
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bit_depth = png_get_bit_depth(png_ptr, info_ptr);
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if (config.verbose) {
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printf("width = %d\n", ic->width);
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printf("height = %d\n", ic->height);
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printf("color_type = %d (palette = %s)\n", color_type, color_type == PNG_COLOR_TYPE_PALETTE ? "yes" : "no");
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printf("bit_depth = %d\n", bit_depth);
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printf("number_of_passes = %d\n", number_of_passes);
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}
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png_ptr);
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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png_set_expand_gray_1_2_4_to_8(png_ptr);
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(png_ptr);
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if (color_type == PNG_COLOR_TYPE_RGB ||
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color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_add_alpha(png_ptr, 0xFF, PNG_FILLER_AFTER);
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if (bit_depth == 16)
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png_set_strip_16(png_ptr);
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number_of_passes = png_set_interlace_handling(png_ptr);
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png_read_update_info(png_ptr, info_ptr);
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ic->width = png_get_image_width(png_ptr, info_ptr);
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ic->height = png_get_image_height(png_ptr, info_ptr);
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color_type = png_get_color_type(png_ptr, info_ptr);
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bit_depth = png_get_bit_depth(png_ptr, info_ptr);
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if (setjmp(png_jmpbuf(png_ptr)))
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abort_("Error during read_image");
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ic->rowPointers = (png_bytep*) malloc(sizeof(png_bytep) * ic->height);
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/*
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if (bit_depth == 16)
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rowbytes = ic->width*8;
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else */
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rowbytes = ic->width*4;
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for (int y=0; y< ic->height; y++)
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ic->rowPointers[y] = (png_byte*) malloc(rowbytes);
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png_read_image(png_ptr, ic->rowPointers);
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fclose(fp);
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if (config.verbose) {
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printf("width = %d\n", ic->width);
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printf("height = %d\n", ic->height);
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printf("color_type = %d (palette = %s)\n", color_type, color_type == PNG_COLOR_TYPE_PALETTE ? "yes" : "no");
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printf("bit_depth = %d\n", bit_depth);
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printf("number_of_passes = %d\n", number_of_passes);
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}
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ic->amigaImage = calloc(ic->width*ic->height, 1);
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}
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