/* 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 <https://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))

typedef struct _GeglTileHandlerClass   GeglTileHandlerClass;
typedef struct _GeglTileHandlerPrivate GeglTileHandlerPrivate;

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. */
  GeglTileHandlerPrivate *priv;
};

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)

/**
 * gegl_tile_handler_create_tile: (skip)
 * @handler: a #GeglTileHandler
 * @x: The tile space x coordinate for the tile
 * @y: The tile space y coordinate for the tile
 * @z: The tile space z coordinate for the tile
 *
 * Create a new tile associated with this tile handler.
 *
 * Return value: the new tile
 */
GeglTile * gegl_tile_handler_create_tile (GeglTileHandler *handler,
                                          gint             x,
                                          gint             y,
                                          gint             z);

/**
 * gegl_tile_handler_get_tile: (skip)
 * @handler: a #GeglTileHandler
 * @x: The tile space x coordinate for the tile
 * @y: The tile space y coordinate for the tile
 * @z: The tile space z coordinate for the tile
 * @preserve_data: whether existing tile data should be preserved
 *
 * Fetches the tile at the given coordinates from @handler.  If the tile
 * doesn't exist, creates a new tile associated with this tile handler.
 *
 * If @preserve_data is FALSE, the tile contents are unspecified.
 *
 * Return value: the tile
 */
GeglTile * gegl_tile_handler_get_tile (GeglTileHandler *handler,
                                       gint             x,
                                       gint             y,
                                       gint             z,
                                       gboolean         preserve_data);

/**
 * gegl_tile_handler_get_source_tile: (skip)
 * @handler: a #GeglTileHandler
 * @x: The tile space x coordinate for the tile
 * @y: The tile space y coordinate for the tile
 * @z: The tile space z coordinate for the tile
 * @preserve_data: whether existing tile data should be preserved
 *
 * Fetches the tile at the given coordinates from @handler source.  If the tile
 * doesn't exist, or if @handler doesn't have a source, creates a new tile
 * associated with this tile handler.
 *
 * If @preserve_data is FALSE, the tile contents are unspecified.
 *
 * Return value: the tile
 */
GeglTile * gegl_tile_handler_get_source_tile (GeglTileHandler *handler,
                                              gint             x,
                                              gint             y,
                                              gint             z,
                                              gboolean         preserve_data);

/**
 * gegl_tile_handler_dup_tile: (skip)
 * @handler: a #GeglTileHandler
 * @tile: the #GeglTile to copy
 * @x: The tile space x coordinate for the tile
 * @y: The tile space y coordinate for the tile
 * @z: The tile space z coordinate for the tile
 *
 * Create a duplicate of @tile, associated with this tile handler.
 *
 * Return value: the new tile
 */
GeglTile * gegl_tile_handler_dup_tile    (GeglTileHandler *handler,
                                          GeglTile        *tile,
                                          gint             x,
                                          gint             y,
                                          gint             z);

void       gegl_tile_handler_damage_tile (GeglTileHandler     *handler,
                                          gint                 x,
                                          gint                 y,
                                          gint                 z,
                                          guint64              damage);
void       gegl_tile_handler_damage_rect (GeglTileHandler     *handler,
                                          const GeglRectangle *rect);

void       gegl_tile_handler_lock        (GeglTileHandler *handler);
void       gegl_tile_handler_unlock      (GeglTileHandler *handler);

G_END_DECLS

#endif