#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

/* A short program which converts a .png file into a .gd2 file, for
   your convenience in creating images on the fly from a
   basis image that must be loaded quickly. The .gd2 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);
	}
#ifdef HAVE_LIBPNG
	im = gdImageCreateFromPng (in);
#else
	im = NULL;
	fprintf(stderr, "No PNG library support available.\n");
#endif
	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;
}