#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#include <stdlib.h>		/* For atoi */

#include "gd.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 x, y, w, h;

	if (argc != 7) {

		fprintf (stderr,

		         "Usage: gdparttopng filename.gd filename.png x y w h\n");

		exit (1);

	}

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

	if (!in) {

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

		exit (1);

	}

	x = atoi (argv[3]);

	y = atoi (argv[4]);

	w = atoi (argv[5]);

	h = atoi (argv[6]);

	printf ("Extracting from (%d, %d), size is %dx%d\n", x, y, w, h);

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

	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.\n");

#endif

	fclose (out);

	gdImageDestroy (im);

	return 0;

}