mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-10 08:54:51 +00:00
169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <png.h>
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/* expects a PNG where the xsize is *2 */
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int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize) {
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int x,y;
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int color;
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FILE *infile;
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int debug=0;
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unsigned char *image;
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int width, height;
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png_byte bit_depth;
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png_structp png_ptr;
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png_infop info_ptr;
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png_bytep *row_pointers;
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// png_byte color_type;
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// int number_of_passes;
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unsigned char header[8];
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/* open file and test for it being a png */
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infile = fopen(filename, "rb");
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if (infile==NULL) {
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fprintf(stderr,"Error! Could not open %s\n",filename);
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return -1;
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}
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/* Check the header */
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fread(header, 1, 8, infile);
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if (png_sig_cmp(header, 0, 8)) {
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fprintf(stderr,"Error! %s is not a PNG file\n",filename);
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return -1;
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}
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/* initialize stuff */
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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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fprintf(stderr,"Error create_read_struct\n");
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exit(-1);
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr) {
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fprintf(stderr,"Error png_create_info_struct\n");
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exit(-1);
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}
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png_init_io(png_ptr, infile);
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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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width = png_get_image_width(png_ptr, info_ptr);
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height = png_get_image_height(png_ptr, info_ptr);
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*xsize=width/2;
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*ysize=height;
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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 (debug) {
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printf("PNG: width=%d height=%d depth=%d\n",width,height,bit_depth);
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}
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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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row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
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for (y=0; y<height; y++) {
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row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
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}
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png_read_image(png_ptr, row_pointers);
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fclose(infile);
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image=calloc(width*height,sizeof(unsigned char));
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if (image==NULL) {
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fprintf(stderr,"Memory error!\n");
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return -1;
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}
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for(y=0;y<height;y++) {
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for(x=0;x<width/2;x++) {
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color= (row_pointers[y][x*2*4]<<16)+
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(row_pointers[y][x*2*4+1]<<8)+
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(row_pointers[y][x*2*4+2]);
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if (debug) {
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printf("%x ",color);
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// printf("(%x,%x,%x,%x) ",
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// row_pointers[y][x*2*4],
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// row_pointers[y][x*2*4+1],
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// row_pointers[y][x*2*4+2],
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// row_pointers[y][x*2*4+3]);
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}
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switch(color) {
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case 0: image[(y*width/2)+x]=0; /* black */
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break;
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case 0xe31e60: image[(y*width/2)+x]=1; /* magenta */
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break;
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case 0x604ebd: image[(y*width/2)+x]=2; /* dark blue */
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break;
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case 0xff44fd: image[(y*width/2)+x]=3; /* purple */
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break;
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case 0xa360: image[(y*width/2)+x]=4; /* dark green */
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break;
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case 0x9c9c9c: image[(y*width/2)+x]=5; /* grey 1 */
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break;
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case 0x14cffd: image[(y*width/2)+x]=6; /* medium blue */
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break;
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case 0xd0c3ff: image[(y*width/2)+x]=7; /* light blue */
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break;
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case 0x607203: image[(y*width/2)+x]=8; /* brown */
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break;
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case 0xff6a3c: image[(y*width/2)+x]=9; /* orange */
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break;
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case 0x9d9d9d: image[(y*width/2)+x]=10; /* grey 2 */
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break;
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case 0xffa0d0: image[(y*width/2)+x]=11; /* pink */
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break;
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case 0x14f53c: image[(y*width/2)+x]=12; /* bright green */
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break;
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case 0xd0dd8d: image[(y*width/2)+x]=13; /* yellow */
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break;
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case 0x72ffd0: image[(y*width/2)+x]=14; /* aqua */
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break;
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case 0xffffff: image[(y*width/2)+x]=15; /* white */
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break;
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default:
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printf("Unknown color %x\n",color);
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image[(y*width/2)+x]=0; break;
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}
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}
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if (debug) printf("\n");
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}
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/* Stripe test image */
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// for(x=0;x<40;x++) for(y=0;y<40;y++) image[(y*width)+x]=y%16;
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/*
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Addr Row /80 %40
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$400 0 0 0 0
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$428 28 16 0
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$450 50 32 0
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$480 80 2 1
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$4A8 a8 18 1
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$4D0 d0 34 1
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$500 100 3 2
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0,0 0,1 0,2....0,39 16,0 16,1 ....16,39 32,0..32,39, X X X X X X X X
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*/
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*image_ptr=image;
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return 0;
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}
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