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