/*
 *	aegis - project change supervisor
 *	Copyright (C) 1998 Peter Miller;
 *	All rights reserved.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipilate GIF files
 */

#include <ac/string.h>

#include <gif.h>
#include <gif/private.h>
#include <mem.h>


gif_ty *
gif_create(path, width, height)
	char		*path;
	int		width;
	int		height;
{
	gif_ty		*result;
	int		j;
	size_t		nbytes;

	/*
	 * initialize things
	 */
	result = mem_alloc(sizeof(gif_ty));
	for (j = 0; j < 256; ++j)
	{
		result->colormap[j][0] = j;
		result->colormap[j][1] = j;
		result->colormap[j][2] = j;
	}

	result->fn = path ? mem_copy_string(path) : (char *)0;
	if (width < 1)
		width = 1;
	else if (width > SIZE_MAX)
		width = SIZE_MAX;
	result->width = width;
	if (height < 1)
		height = 1;
	else if (height > SIZE_MAX)
		height = SIZE_MAX;
	result->height = height;
	result->mode = gif_mode_rdwr;
	result->mime = 0;
	
	/*
	 * allocate the image
	 */
	nbytes = (size_t)result->width * (size_t)result->height;
	result->image_flat = mem_alloc(nbytes);
	memset(result->image_flat, 0, nbytes);
	result->image =
		mem_alloc((size_t)result->height * sizeof(unsigned char *));
	for (j = 0; j < result->height; ++j)
		result->image[j] = result->image_flat + j * result->width;

	/*
	 * all done
	 */
	return result;
}