/* This file is part of GEGL.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006,2007 Øyvind Kolås <pippin@gimp.org>
*/
#ifndef __GEGL_TILE_HANDLER_H__
#define __GEGL_TILE_HANDLER_H__
#include "gegl-tile-source.h"
/***
* GeglTileHandler define the chain pattern that allow to stack GeglTileSource classes on
* top of each others, each doing different task in response to command given (see GeglTileSource).
*
* A classical GeglBuffer is a stack of subclasses of GeglTileHandler with a GeglTileBackend on
* the bottom. This architecture is designed to be modular and flexible on purpose, even allowing
* to use a GeglBuffer as a source for another GeglBuffer.
*/
G_BEGIN_DECLS
#define GEGL_TYPE_TILE_HANDLER (gegl_tile_handler_get_type ())
#define GEGL_TILE_HANDLER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GEGL_TYPE_TILE_HANDLER, GeglTileHandler))
#define GEGL_TILE_HANDLER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GEGL_TYPE_TILE_HANDLER, GeglTileHandlerClass))
#define GEGL_IS_TILE_HANDLER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GEGL_TYPE_TILE_HANDLER))
#define GEGL_IS_TILE_HANDLER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GEGL_TYPE_TILE_HANDLER))
#define GEGL_TILE_HANDLER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GEGL_TYPE_TILE_HANDLER, GeglTileHandlerClass))
struct _GeglTileHandler
{
GeglTileSource parent_instance;
GeglTileSource *source; /* The source of the data, which we can rely on if
our command handler doesn't handle a command, this
is typically done with gegl_tile_handler_source_command
passing ourself as the first parameter. */
};
struct _GeglTileHandlerClass
{
GeglTileSourceClass parent_class;
};
GType gegl_tile_handler_get_type (void) G_GNUC_CONST;
void
gegl_tile_handler_set_source (GeglTileHandler *handler,
GeglTileSource *source);
#define gegl_tile_handler_get_source(handler) (((GeglTileHandler*)handler)->source)
#define gegl_tile_handler_source_command(handler,command,x,y,z,data) (gegl_tile_handler_get_source(handler)?gegl_tile_source_command(gegl_tile_handler_get_source(handler), command, x, y, z, data):NULL)
G_END_DECLS
#endif