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/* The GIMP -- an 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
*/
typedef struct _PixelSurround
{
Tile *tile;
TileManager *mgr;
guchar *buff;
gint buff_size;
gint bpp;
gint w;
gint h;
guchar bg[MAX_CHANNELS];
gint row_stride;
} PixelSurround;
void pixel_surround_init (PixelSurround *ps,
TileManager *tm,
gint w,
gint h,
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
*/
guchar * pixel_surround_lock (PixelSurround *ps,
gint x,
gint y);
gint pixel_surround_rowstride (PixelSurround *ps);
void pixel_surround_release (PixelSurround *ps);
void pixel_surround_clear (PixelSurround *ps);
#endif /* __PIXEL_SURROUND_H__ */
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