/* 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 Øyvind Kolås <pippin@gimp.org>

 */

#ifndef __GEGL_TILE_HANDLER_CHAIN_H__

#define __GEGL_TILE_HANDLER_CHAIN_H__

#include "gegl-tile-handler.h"

/***

 * GeglTileHandlerChain is a GeglTileHandler that easily create and destroy a chain of GeglTileHandler.

 */

#define GEGL_TYPE_TILE_HANDLER_CHAIN            (gegl_tile_handler_chain_get_type ())

#define GEGL_TILE_HANDLER_CHAIN(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GEGL_TYPE_TILE_HANDLER_CHAIN, GeglTileHandlerChain))

#define GEGL_TILE_HANDLER_CHAIN_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GEGL_TYPE_TILE_HANDLER_CHAIN, GeglTileHandlerChainClass))

#define GEGL_IS_TILE_HANDLER_CHAIN(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GEGL_TYPE_TILE_HANDLER_CHAIN))

#define GEGL_IS_TILE_HANDLER_CHAIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GEGL_TYPE_TILE_HANDLER_CHAIN))

#define GEGL_TILE_HANDLER_CHAIN_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GEGL_TYPE_TILE_HANDLER_CHAIN, GeglTileHandlerChainClass))

struct _GeglTileHandlerChain

{

  GeglTileHandler  parent_instance;

  GSList      *chain;

};

struct _GeglTileHandlerChainClass

{

  GeglTileHandlerClass parent_class;

};

GType         gegl_tile_handler_chain_get_type   (void) G_GNUC_CONST;

/**

 * gegl_tile_handler_chain_add:

 * @tile_handler_chain: a #GeglTileHandlerChain

 * @handler: a #GeglTileHandler.

 *

 * Adds @handler to the list of tile_handler_chain to be processed, the order tile_handler_chain

 * are added in is from original source to last processing element, commands

 * are passed from the last added to the first one in the chain, tiles

 * and other results are passed back up

 *

 * Returns: the added handler.

 */

GeglTileHandler * gegl_tile_handler_chain_add

                                      (GeglTileHandlerChain *tile_handler_chain,

                                       GeglTileHandler      *handler);

/* Binds the tile-handlers in the chain together.

 */

void gegl_tile_handler_chain_bind (GeglTileHandlerChain *tile_handler_chain);

/* returns the first matching handler of a specified type (or NULL) */

GeglTileHandler * gegl_tile_handler_chain_get_first

                                      (GeglTileHandlerChain *tile_handler_chain,

                                       GType                 type);

#endif