gimp/app/tile_pvt.h

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#ifndef __TILE_PVT_H__
#define __TILE_PVT_H__
#ifdef USE_PTHREADS
#include <pthread.h>
#endif
#include <sys/types.h>
#include <glib.h>
#include "config.h"
#include "tile.h"
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typedef struct _TileLink TileLink;
struct _TileLink
{
TileLink *next;
int tile_num; /* the number of this tile within the drawable */
void *tm; /* A pointer to the tile manager for this tile.
* We need this in order to call the tile managers
* validate proc whenever the tile is referenced yet
* invalid.
*/
};
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struct _Tile
{
short ref_count; /* reference count. when the reference count is
* non-zero then the "data" for this tile must
* be valid. when the reference count for a tile
* is 0 then the "data" for this tile must be
* NULL.
*/
short write_count; /* write count: number of references that are
for write access */
short share_count; /* share count: number of tile managers that
hold this tile */
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guint dirty : 1; /* is the tile dirty? has it been modified? */
guint valid : 1; /* is the tile valid? */
unsigned char bpp; /* the bytes per pixel (1, 2, 3 or 4) */
unsigned short ewidth; /* the effective width of the tile */
unsigned short eheight; /* the effective height of the tile */
/* a tile's effective width and height may be smaller
* (but not larger) than TILE_WIDTH and TILE_HEIGHT.
* this is to handle edge tiles of a drawable.
*/
TileRowHint *rowhint; /* An array of hints for rendering purposes */
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guchar *data; /* the data for the tile. this may be NULL in which
* case the tile data is on disk.
*/
int swap_num; /* the index into the file table of the file to be used
* for swapping. swap_num 1 is always the global swap file.
*/
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off_t swap_offset; /* the offset within the swap file of the tile data.
* if the tile data is in memory this will be set to -1.
*/
TileLink *tlink;
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Tile *next;
Tile *prev; /* List pointers for the tile cache lists */
void *listhead; /* Pointer to the head of the list this tile is on */
#ifdef USE_PTHREADS
pthread_mutex_t mutex;
#endif
};
#ifdef USE_PTHREADS
#define TILE_MUTEX_LOCK(tile) pthread_mutex_lock(&((tile)->mutex))
#define TILE_MUTEX_UNLOCK(tile) pthread_mutex_unlock(&((tile)->mutex))
#else
#define TILE_MUTEX_LOCK(tile) /* nothing */
#define TILE_MUTEX_UNLOCK(tile) /* nothing */
#endif
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#endif /* __TILE_PVT_H__ */