
#include "gd.h"
#include <stdio.h>
#include <stdlib.h>

/* A short program which converts a .png file into a .gd file, for
   your convenience in creating images on the fly from a
   basis image that must be loaded quickly. The .gd format
   is not intended to be a general-purpose format. */

int main(int argc, char **argv)
{
    gdImagePtr im;
    FILE *in, *out;
    int cs, fmt;

    if (argc != 5) {
        fprintf(stderr, "Usage: pngtogd2 filename.png filename.gd2 cs fmt\n");
        fprintf(stderr, "    where cs is the chunk size\n");
        fprintf(stderr, "          fmt is 1 for raw, 2 for compressed\n");
        exit(1);
    }
    in = fopen(argv[1], "rb");
    if (!in) {
        fprintf(stderr, "Input file does not exist!\n");
        exit(1);
    }
    im = gdImageCreateFromPng(in);
    fclose(in);
    if (!im) {
        fprintf(stderr, "Input is not in PNG format!\n");
        exit(1);
    }
    out = fopen(argv[2], "wb");
    if (!out) {
        fprintf(stderr, "Output file cannot be written to!\n");
        gdImageDestroy(im);
        exit(1);
    }
    cs = atoi(argv[3]);
    fmt = atoi(argv[4]);
    gdImageGd2(im, out, cs, fmt);
    fclose(out);
    gdImageDestroy(im);

    return 0;
}
