/* 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