117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/* Convert 80x48 png image to two files to be loaded as Apple II DGR */
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#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 "loadpng.h"
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static short gr_offsets[]={
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0x400,0x480,0x500,0x580,0x600,0x680,0x700,0x780,
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0x428,0x4a8,0x528,0x5a8,0x628,0x6a8,0x728,0x7a8,
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0x450,0x4d0,0x550,0x5d0,0x650,0x6d0,0x750,0x7d0,
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};
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/* in even colors in AUX mem the colors are rotated right by one */
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/* for some reason */
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static unsigned char aux_colors[]={
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0, /* 0000 -> 0000 */
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8, /* 0001 -> 1000 */
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1, /* 0010 -> 0001 */
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9, /* 0011 -> 1001 */
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2, /* 0100 -> 0010 */
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10, /* 0101 -> 1010 */
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3, /* 0110 -> 0011 */
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11, /* 0111 -> 1011 */
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4, /* 1000 -> 0100 */
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12, /* 1001 -> 1100 */
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5, /* 1010 -> 0101 */
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13, /* 1011 -> 1101 */
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6, /* 1100 -> 0110 */
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14, /* 1101 -> 1110 */
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7, /* 1110 -> 0111 */
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15 /* 1111 -> 1111 */
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};
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/* Converts a PNG to a GR file you can BLOAD to 0x400 */
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/* HOWEVER you *never* want to do this in real life */
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/* as it will clobber important values in the memory holes */
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int main(int argc, char **argv) {
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int row=0;
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int col=0;
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int x;
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int temp_low,temp_high,temp_color;
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unsigned char aux_buffer[1024];
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unsigned char main_buffer[1024];
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unsigned char *image;
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int xsize,ysize;
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FILE *aux_outfile;
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FILE *main_outfile;
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char aux_filename[BUFSIZ];
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char main_filename[BUFSIZ];
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if (argc<3) {
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fprintf(stderr,"Usage:\t%s INFILE OUTFILE_BASE\n\n",argv[0]);
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exit(-1);
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}
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sprintf(aux_filename,"%s.aux",argv[2]);
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sprintf(main_filename,"%s.main",argv[2]);
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aux_outfile=fopen(aux_filename,"w");
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if (aux_outfile==NULL) {
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fprintf(stderr,"Error! Could not open %s\n",aux_filename);
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exit(-1);
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}
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main_outfile=fopen(main_filename,"w");
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if (main_outfile==NULL) {
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fprintf(stderr,"Error! Could not open %s\n",main_filename);
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exit(-1);
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}
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if (loadpng(argv[1],&image,&xsize,&ysize,PNG_NO_ADJUST)<0) {
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fprintf(stderr,"Error loading png!\n");
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exit(-1);
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}
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fprintf(stderr,"Loaded image %d by %d\n",xsize,ysize);
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memset(main_buffer,0,1024);
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memset(aux_buffer,0,1024);
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for(row=0;row<24;row++) {
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for(col=0;col<40;col++) {
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/* note, the aux bytes are rotated right by 1 (!?) */
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temp_low=(image[row*xsize+(col*2)])&0xf;
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temp_high=(image[row*xsize+(col*2)]>>4)&0xf;
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temp_color=(aux_colors[temp_high]<<4)|
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(aux_colors[temp_low]);
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aux_buffer[(gr_offsets[row]-0x400)+col]=temp_color;
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main_buffer[(gr_offsets[row]-0x400)+col]=
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image[row*xsize+(col*2)+1];
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}
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}
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for(x=0;x<1024;x++) fputc( aux_buffer[x],aux_outfile);
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for(x=0;x<1024;x++) fputc( main_buffer[x],main_outfile);
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fclose(aux_outfile);
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fclose(main_outfile);
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return 0;
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}
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