/*
 *	aegis - project change supervisor
 *	Copyright (C) 1998, 2002, 2003 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(const char *path, int width, int height)
{
    gif_ty          *result;
    int             j;
    size_t          nbytes;

    /*
     * initialize things
     */
    result = (gif_ty *)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 = (unsigned char *)mem_alloc(nbytes);
    memset(result->image_flat, 0, nbytes);
    result->image = (unsigned char **)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;
}
