dos33fsprogs/gr-utils/png2sixrle.c
2020-10-27 16:45:11 -04:00

81 lines
1.4 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "loadpng.h"
static int print_rle(int color, int run) {
int ret=0;
if ((color&0xf)!=((color>>4)&0xf)) {
fprintf(stderr,"color not match! %x\n",color);
ret=1;
}
if (run>63) {
fprintf(stderr,"Run too big %x\n",run);
ret=1;
}
printf("%c%c",(color&0xf)+' ',run+' ');
// fprintf(stderr,"c=%x run=%x\n",color,run);
return ret;
}
/* Converts a PNG to a 6-bit RLE encoding */
int main(int argc, char **argv) {
int row=0;
int col=0;
int color=0,oldcolor=0;
int run=0;
unsigned char *image;
int xsize,ysize;
if (argc<2) {
fprintf(stderr,"Usage:\t%s INFILE\n\n",argv[0]);
exit(-1);
}
if (loadpng(argv[1],&image,&xsize,&ysize,PNG_WHOLETHING)<0) {
fprintf(stderr,"Error loading png!\n");
exit(-1);
}
fprintf(stderr,"Loaded image %d by %d\n",xsize,ysize);
oldcolor=image[0];
for(row=0;row<24;row++) {
for(col=0;col<40;col++) {
color=image[row*xsize+col];
if (color!=oldcolor) {
if (print_rle(oldcolor,run)) {
fprintf(stderr,"at %d, %d\n",col,row);
}
oldcolor=color;
run=0;
}
if (run>62) {
if (print_rle(oldcolor,run)) {
fprintf(stderr,"at %d, %d\n",col,row);
}
oldcolor=color;
run=0;
}
run++;
}
}
print_rle(oldcolor,run);
printf("\n");
return 0;
}