gimp/app/tile_manager.h

118 lines
3.8 KiB
C

/* 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 __TILE_MANAGER_H__
#define __TILE_MANAGER_H__
#include "tile.h"
typedef struct _TileLevel TileLevel;
typedef struct _TileManager TileManager;
typedef void (*TileValidateProc) (TileManager *tm,
Tile *tile,
int level);
/* Creates a new tile manager with the specified
* width for the toplevel. The toplevel sizes is
* used to compute the number of levels and there
* size. Each level is 1/2 the width and height of
* the level above it.
* The toplevel is level 0. The smallest level in the
* hierarchy is "nlevels - 1". That level will be smaller
* than TILE_WIDTH x TILE_HEIGHT
*/
TileManager* tile_manager_new (int toplevel_width,
int toplevel_height,
int bpp);
/* Destroy a tile manager and all the tiles it contains.
*/
void tile_manager_destroy (TileManager *tm);
/* Calculate the number of levels necessary to have a complete
* hierarchy. This procedure is normally called twice with
* the width and then height and the maximum value returned
* is then used as the number of levels an image needs.
*/
int tile_manager_calc_levels (int size,
int tile_size);
/* Set the number of levels this tile manager is managing.
* This procedure may destroy unnecessary levels in the
* tile manager if the new number of levels is less than
* the old number of levels.
* Any newly added levels will consist of invalid tiles.
*/
void tile_manager_set_nlevels (TileManager *tm,
int nlevels);
/* Set the validate procedure for the tile manager.
* The validate procedure is called when an invalid tile
* is referenced. If the procedure is NULL, then the tile
* is set to valid and its memory is allocated, but
* not initialized.
*/
void tile_manager_set_validate_proc (TileManager *tm,
TileValidateProc proc);
/* Get a specified tile from a tile manager. The tile
* is from the given level and contains the specified
* pixel. Be aware that the pixel coordinates are
* dependent on the level.
*/
Tile* tile_manager_get_tile (TileManager *tm,
int xpixel,
int ypixel,
int level);
/* Get a specified tile from a tile manager.
*/
Tile* tile_manager_get (TileManager *tm,
int tile_num,
int level);
/* Validate a tiles memory.
*/
void tile_manager_validate (TileManager *tm,
Tile *tile);
/* Given a toplevel tile, this procedure will invalidate
* (set the dirty bit) for all tiles in lower levels which
* contain this toplevel tile.
* Note: if a level hasn't been created then the tile for that
* level won't be invalidated.
*/
void tile_manager_invalidate_tiles (TileManager *tm,
Tile *toplevel_tile);
/* Invalidates all the tiles in the sublevels.
*/
void tile_manager_invalidate_sublevels (TileManager *tm);
/* Update a portion lower level tile given a toplevel tile.
*/
void tile_manager_update_tile (TileManager *tm,
Tile *toplevel_tile,
int level);
#endif /* __TILE_MANAGER_H__ */