#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 x=0, y=0, w=0, h=0;

	if ((argc != 3) && (argc != 7)) {

		fprintf (stderr,

		         "Usage: gd2topng filename.gd2 filename.png [srcx srcy width height]\n");

		fprintf (stderr,

		         "If the coordinates are absent,t he entire image is converted.\n");

		exit (1);

	}

	if (argc == 7) {

		x = atoi (argv[3]);

		y = atoi (argv[4]);

		w = atoi (argv[5]);

		h = atoi (argv[6]);

	}

	in = fopen (argv[1], "rb");

	if (!in) {

		fprintf(stderr, "Input file does not exist!\n");

		exit (1);

	}

	if (argc == 7) {

		im = gdImageCreateFromGd2Part (in, x, y, w, h);

	} else {

		im = gdImageCreateFromGd2 (in);

	}

	fclose (in);

	if (!im) {

		fprintf(stderr, "Input is not in GD2 format!\n");

		exit (1);

	}

	out = fopen (argv[2], "wb");

	if (!out) {

		fprintf(stderr, "Output file cannot be written to!\n");

		gdImageDestroy (im);

		exit (1);

	}

#ifdef HAVE_LIBPNG

	gdImagePng (im, out);

#else

	fprintf(stderr, "No PNG library support available.\n");

#endif

	fclose (out);

	gdImageDestroy (im);

	return 0;

}