mirror of https://github.com/GNOME/gimp.git
97 lines
2.4 KiB
C
97 lines
2.4 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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* c-o-w
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*/
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void tile_mirror (Tile *dest_tile, Tile *src_tile);
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/* Referencing a tile causes the reference count to be incremented.
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* If the reference count was previously 0 the tile will will be
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* swapped into memory from disk.
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*
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* tile_ref2 is a new tile-referencing interface through which you
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* should register your intent to dirty the tile. This will facilitate
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* copy-on-write tile semantics.
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*/
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#if defined (TILE_DEBUG) && defined (__GNUC__)
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#define tile_ref(t) _tile_ref (t, __PRETTY_FUNCTION__)
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void _tile_ref (Tile *tile, char *func_name);
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#define tile_ref2(t,d) _tile_ref2 (t, d, __PRETTY_FUNCTION__)
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void _tile_ref2 (Tile *tile, int dirty, char *func_name);
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#else
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void tile_ref (Tile *tile);
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void tile_ref2 (Tile *tile, int dirty);
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#endif
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/* Unreferencing a tile causes the reference count to be decremented.
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* When the reference count reaches 0 the tile data will be swapped
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* out to disk. Note that the tile may be in the tile cache which
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* also references the tile causing the reference count not to
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* fall below 1 until the tile is removed from the cache.
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* The dirty flag indicates whether the tile data has been dirtied
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* while referenced.
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*/
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#if defined (TILE_DEBUG) && defined (__GNUC__)
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#define tile_unref(t,d) _tile_unref (t, d, __PRETTY_FUNCTION__)
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void _tile_unref (Tile *tile, int dirty, char *func_name);
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#else
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void tile_unref (Tile *tile, int dirty);
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#endif
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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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/* Invalidates a tile. This involves setting its invalid bit and
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* a) if the tile is in memory deleting the tile data or b) if the
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* tile is in the swap file, deleting the space it occupies. This
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* will cause the tile data to need to be recalculated.
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* This should probably only be used on sublevel tiles. Invalidating
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* a toplevel tile would mean that it needs to be recalculated. But
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* what do you recalculate a toplevel tile from?
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*/
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void tile_invalidate (Tile *tile);
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#endif /* __TILE_H__ */
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