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