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Java example source code file (TileWorker.java)
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The TileWorker.java Java example source code
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.java2d.jules;
import java.util.*;
public class TileWorker implements Runnable {
final static int RASTERIZED_TILE_SYNC_GRANULARITY = 8;
final ArrayList<JulesTile> rasterizedTileConsumerCache =
new ArrayList<JulesTile>();
final LinkedList<JulesTile> rasterizedBuffers = new LinkedList();
IdleTileCache tileCache;
JulesAATileGenerator tileGenerator;
int workerStartIndex;
volatile int consumerPos = 0;
/* Threading statistics */
int mainThreadCnt = 0;
int workerCnt = 0;
int doubled = 0;
public TileWorker(JulesAATileGenerator tileGenerator, int workerStartIndex, IdleTileCache tileCache) {
this.tileGenerator = tileGenerator;
this.workerStartIndex = workerStartIndex;
this.tileCache = tileCache;
}
public void run() {
ArrayList<JulesTile> tiles = new ArrayList(16);
for (int i = workerStartIndex; i < tileGenerator.getTileCount(); i++) {
TileTrapContainer tile = tileGenerator.getTrapContainer(i);
if (tile != null && tile.getTileAlpha() == 127) {
JulesTile rasterizedTile =
tileGenerator.rasterizeTile(i,
tileCache.getIdleTileWorker(
tileGenerator.getTileCount() - i - 1));
tiles.add(rasterizedTile);
if (tiles.size() > RASTERIZED_TILE_SYNC_GRANULARITY) {
addRasterizedTiles(tiles);
tiles.clear();
}
}
i = Math.max(i, consumerPos + RASTERIZED_TILE_SYNC_GRANULARITY / 2);
}
addRasterizedTiles(tiles);
tileCache.disposeRasterizerResources();
}
/**
* Returns a rasterized tile for the specified tilePos,
* or null if it isn't available.
* Allowed caller: MaskBlit/Consumer-Thread
*/
public JulesTile getPreRasterizedTile(int tilePos) {
JulesTile tile = null;
if (rasterizedTileConsumerCache.size() == 0 &&
tilePos >= workerStartIndex)
{
synchronized (rasterizedBuffers) {
rasterizedTileConsumerCache.addAll(rasterizedBuffers);
rasterizedBuffers.clear();
}
}
while (tile == null && rasterizedTileConsumerCache.size() > 0) {
JulesTile t = rasterizedTileConsumerCache.get(0);
if (t.getTilePos() > tilePos) {
break;
}
if (t.getTilePos() < tilePos) {
tileCache.releaseTile(t);
doubled++;
}
if (t.getTilePos() <= tilePos) {
rasterizedTileConsumerCache.remove(0);
}
if (t.getTilePos() == tilePos) {
tile = t;
}
}
if (tile == null) {
mainThreadCnt++;
// If there are no tiles left, tell the producer the current
// position. This avoids producing tiles twice.
consumerPos = tilePos;
} else {
workerCnt++;
}
return tile;
}
private void addRasterizedTiles(ArrayList<JulesTile> tiles) {
synchronized (rasterizedBuffers) {
rasterizedBuffers.addAll(tiles);
}
}
/**
* Releases cached tiles.
* Allowed caller: MaskBlit/Consumer-Thread
*/
public void disposeConsumerResources() {
synchronized (rasterizedBuffers) {
tileCache.releaseTiles(rasterizedBuffers);
}
tileCache.releaseTiles(rasterizedTileConsumerCache);
}
}
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