/* GIMP - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 02111-1307, USA.
 */

#ifndef __PIXEL_SURROUND_H__
#define __PIXEL_SURROUND_H__


/* PixelSurround describes a (read-only)
 *  region around a pixel in a tile manager
 */


PixelSurround * pixel_surround_new      (TileManager   *tiles,
                                         gint           width,
                                         gint           height,
                                         const guchar   bg[MAX_CHANNELS]);

/* return a pointer to a buffer which contains all the surrounding pixels
 * strategy: if we are in the middle of a tile, use the tile storage
 * otherwise just copy into our own malloced buffer and return that
 */
const guchar  * pixel_surround_lock     (PixelSurround *surround,
                                         gint           x,
                                         gint           y,
                                         gint          *rowstride);

void            pixel_surround_release  (PixelSurround *surround);

void            pixel_surround_destroy  (PixelSurround *surround);


#endif /* __PIXEL_SURROUND_H__ */
