gimp/app/tile.h

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#ifndef __TILE_H__
#define __TILE_H__
#define TILE_WIDTH 64
#define TILE_HEIGHT 64
/* Uncomment for verbose debugging on copy-on-write logic
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#define TILE_DEBUG
*/
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#include <sys/types.h>
#include <glib.h>
#include "config.h"
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typedef struct _Tile Tile;
/* Initializes the fields of a tile to "good" values.
*/
void tile_init (Tile *tile,
int bpp);
/*
* tile_lock locks a tile into memory. This does what tile_ref used
* to do. It is the responsibility of the tile manager to take care
* of the copy-on-write semantics. Locks stack; a tile remains locked
* in memory as long as it's been locked more times than it has been
* released. tile_release needs to know whether the release was for
* write access. (This is a hack, and should be handled better.)
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*/
void tile_lock (Tile *);
void tile_release (Tile *, int);
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/* Allocate the data for the tile.
*/
void tile_alloc (Tile *tile);
/* Return the size in bytes of the tiles data.
*/
int tile_size (Tile *tile);
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int tile_ewidth (Tile *tile);
int tile_eheight (Tile *tile);
int tile_bpp (Tile *tile);
int tile_is_valid (Tile *tile);
void tile_mark_valid (Tile *tile);
void *tile_data_pointer (Tile *tile, int xoff, int yoff);
/* tile_attach attaches a tile to a tile manager: this function
* increments the tile's share count and inserts a tilelink into the
* tile's link list. tile_detach reverses the process.
* If a tile's share count is zero after a tile_detach, the tile is
* discarded.
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*/
void tile_attach (Tile *tile, void *tm, int tile_num);
void tile_detach (Tile *tile, void *tm, int tile_num);
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#endif /* __TILE_H__ */