mirror of https://github.com/GNOME/gimp.git
343 lines
6.4 KiB
C
343 lines
6.4 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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#include "config.h"
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#include <glib-object.h>
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#include "base-types.h"
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#include "tile.h"
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#include "tile-cache.h"
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#include "tile-manager.h"
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#include "tile-rowhints.h"
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#include "tile-swap.h"
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#include "tile-private.h"
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/* Uncomment for verbose debugging on copy-on-write logic */
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/* #define TILE_DEBUG */
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/* This is being used from tile-swap, but just for debugging purposes. */
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static gint tile_ref_count = 0;
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#ifdef TILE_PROFILING
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static gint tile_count = 0;
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static gint tile_share_count = 0;
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static gint tile_active_count = 0;
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gint tile_exist_peak = 0;
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gint tile_exist_count = 0;
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#endif
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static void tile_destroy (Tile *tile);
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Tile *
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tile_new (gint bpp)
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{
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Tile *tile = g_slice_new0 (Tile);
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tile->ewidth = TILE_WIDTH;
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tile->eheight = TILE_HEIGHT;
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tile->bpp = bpp;
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tile->swap_offset = -1;
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#ifdef TILE_PROFILING
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tile_count++;
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#endif
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return tile;
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}
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void
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tile_lock (Tile *tile)
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{
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/* Increment the global reference count.
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*/
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tile_ref_count++;
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/* Increment this tile's reference count.
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*/
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tile->ref_count++;
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if (tile->ref_count == 1)
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{
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/* remove from cache, move to main store */
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tile_cache_flush (tile);
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#ifdef TILE_PROFILING
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tile_active_count++;
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#endif
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}
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if (tile->data == NULL)
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{
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/* There is no data, so the tile must be swapped out */
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tile_swap_in (tile);
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}
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/* Call 'tile_manager_validate' if the tile was invalid.
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*/
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if (! tile->valid)
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{
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/* an invalid tile should never be shared, so this should work */
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tile_manager_validate_tile (tile->tlink->tm, tile);
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}
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}
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void
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tile_release (Tile *tile,
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gboolean dirty)
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{
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/* Decrement the global reference count.
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*/
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tile_ref_count--;
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/* Decrement this tile's reference count.
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*/
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tile->ref_count--;
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/* Decrement write ref count if dirtying
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*/
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if (dirty)
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{
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gint y;
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tile->write_count--;
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if (tile->rowhint)
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{
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for (y = 0; y < tile->eheight; y++)
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tile->rowhint[y] = TILEROWHINT_UNKNOWN;
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}
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}
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if (tile->ref_count == 0)
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{
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#ifdef TILE_PROFILING
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tile_active_count--;
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#endif
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if (tile->share_count == 0)
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{
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/* tile is truly dead */
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tile_destroy (tile);
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return; /* skip terminal unlock */
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}
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else
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{
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/* last reference was just released, so move the tile to the
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tile cache */
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tile_cache_insert (tile);
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}
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}
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}
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void
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tile_alloc (Tile *tile)
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{
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if (tile->data)
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return;
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/* Allocate the data for the tile.
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*/
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tile->data = g_new (guchar, tile->size);
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#ifdef TILE_PROFILING
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tile_exist_count++;
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if (tile_exist_count > tile_exist_peak)
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tile_exist_peak = tile_exist_count;
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#endif
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}
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static void
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tile_destroy (Tile *tile)
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{
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if (G_UNLIKELY (tile->ref_count))
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{
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g_warning ("tried to destroy a ref'd tile");
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return;
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}
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if (G_UNLIKELY (tile->share_count))
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{
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g_warning ("tried to destroy an attached tile");
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return;
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}
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if (tile->data)
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{
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g_free (tile->data);
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tile->data = NULL;
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#ifdef TILE_PROFILING
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tile_exist_count--;
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#endif
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}
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if (tile->rowhint)
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{
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g_slice_free1 (sizeof (TileRowHint) * TILE_HEIGHT, tile->rowhint);
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tile->rowhint = NULL;
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}
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/* must flush before deleting swap */
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tile_cache_flush (tile);
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if (tile->swap_offset != -1)
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{
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/* If the tile is on disk, then delete its
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* presence there.
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*/
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tile_swap_delete (tile);
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}
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g_slice_free (Tile, tile);
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#ifdef TILE_PROFILING
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tile_count--;
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#endif
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}
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gint
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tile_size (Tile *tile)
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{
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/* Return the actual size of the tile data.
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* (Based on its effective width and height).
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*/
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return tile->size;
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}
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gint
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tile_ewidth (Tile *tile)
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{
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return tile->ewidth;
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}
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gint
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tile_eheight (Tile *tile)
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{
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return tile->eheight;
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}
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gint
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tile_bpp (Tile *tile)
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{
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return tile->bpp;
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}
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gboolean
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tile_is_valid (Tile *tile)
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{
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return tile->valid;
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}
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void
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tile_attach (Tile *tile,
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void *tm,
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gint tile_num)
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{
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TileLink *new;
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if ((tile->share_count > 0) && (! tile->valid))
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{
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/* trying to share invalid tiles is problematic, not to mention silly */
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tile_manager_validate_tile (tile->tlink->tm, tile);
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}
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tile->share_count++;
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#ifdef TILE_PROFILING
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tile_share_count++;
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#endif
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#ifdef TILE_DEBUG
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g_printerr ("tile_attach: %p -> (%p,%d) *%d\n",
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tile, tm, tile_num, tile->share_count);
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#endif
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/* link this tile into the tile's tilelink chain */
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new = g_slice_new (TileLink);
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new->tm = tm;
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new->tile_num = tile_num;
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new->next = tile->tlink;
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tile->tlink = new;
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}
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void
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tile_detach (Tile *tile,
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void *tm,
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gint tile_num)
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{
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TileLink **link;
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TileLink *tmp;
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#ifdef TILE_DEBUG
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g_printerr ("tile_detach: %p ~> (%p,%d) r%d *%d\n",
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tile, tm, tile_num, tile->ref_count, tile->share_count);
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#endif
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for (link = &tile->tlink;
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*link != NULL;
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link = &(*link)->next)
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{
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if (((*link)->tm == tm) && ((*link)->tile_num == tile_num))
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break;
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}
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if (G_UNLIKELY (*link == NULL))
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{
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g_warning ("Tried to detach a nonattached tile -- TILE BUG!");
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return;
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}
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tmp = *link;
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*link = tmp->next;
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g_slice_free (TileLink, tmp);
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#ifdef TILE_PROFILING
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tile_share_count--;
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#endif
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tile->share_count--;
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if (tile->share_count == 0 && tile->ref_count == 0)
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tile_destroy (tile);
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}
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gpointer
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tile_data_pointer (Tile *tile,
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gint xoff,
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gint yoff)
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{
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return TILE_DATA_POINTER (tile, xoff, yoff);
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}
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gint
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tile_global_refcount (void)
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{
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return tile_ref_count;
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}
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