mirror of https://github.com/GNOME/gimp.git
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __TILE_PRIVATE_H__
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#define __TILE_PRIVATE_H__
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/* Uncomment to enable global counters to profile the tile system. */
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/* #define TILE_PROFILING */
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typedef struct _TileLink TileLink;
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struct _TileLink
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{
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TileLink *next;
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gint tile_num; /* the number of this tile within the drawable */
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TileManager *tm; /* A pointer to the tile manager for this tile.
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* We need this in order to call the tile managers
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* validate proc whenever the tile is referenced
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* yet invalid.
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*/
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};
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struct _Tile
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{
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gshort ref_count; /* reference count. when the reference count is
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* non-zero then the "data" for this tile must
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* be valid. when the reference count for a tile
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* is 0 then the "data" for this tile must be
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* NULL.
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*/
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gshort write_count; /* write count: number of references that are
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for write access */
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gshort share_count; /* share count: number of tile managers that
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hold this tile */
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guint dirty : 1; /* is the tile dirty? has it been modified? */
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guint valid : 1; /* is the tile valid? */
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guint cached : 1; /* is the tile cached */
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#ifdef TILE_PROFILING
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guint zorched : 1; /* was the tile flushed due to cache pressure
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[zorched]? */
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guint zorchout: 1; /* was the tile swapped out due to cache
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pressure [zorched]? */
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guint inonce : 1; /* has the tile been swapped in at least once? */
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guint outonce : 1; /* has the tile been swapped out at least once? */
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#endif
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guchar bpp; /* the bytes per pixel (1, 2, 3 or 4) */
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gushort ewidth; /* the effective width of the tile */
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gushort eheight; /* the effective height of the tile
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* a tile's effective width and height may be smaller
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* (but not larger) than TILE_WIDTH and TILE_HEIGHT.
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* this is to handle edge tiles of a drawable.
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*/
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gint size; /* size of the tile data (ewidth * eheight * bpp) */
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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
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* case the tile data is on disk.
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*/
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gint64 swap_offset; /* the offset within the swap file of the tile data.
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* if the tile data is in memory this will be set
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* to -1.
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*/
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TileLink *tlink;
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Tile *next; /* List pointers for the tile cache lists */
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Tile *prev;
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};
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/* tile_data_pointer() as a macro so that it can be inlined
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*
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* Note that (y) & (TILE_HEIGHT-1) is equivalent to (y) % TILE_HEIGHT
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* for positive power-of-two divisors
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*/
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#define TILE_DATA_POINTER(tile,x,y) \
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((tile)->data + \
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(((y) & (TILE_HEIGHT-1)) * \
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(tile)->ewidth + ((x) & (TILE_WIDTH-1))) * (tile)->bpp)
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#endif /* __TILE_PRIVATE_H__ */
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