/*
* @(#)ImageDecoder.java 1.23 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package sun.awt.image;
import java.util.Hashtable;
import java.io.InputStream;
import java.io.IOException;
import java.awt.image.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
public abstract class ImageDecoder {
protected InputStreamImageSource source;
protected InputStream input;
Thread feeder;
protected boolean aborted;
protected boolean finished;
protected ImageConsumerQueue queue;
ImageDecoder next;
public ImageDecoder(InputStreamImageSource src, InputStream is) {
source = src;
input = is;
feeder = Thread.currentThread();
}
public boolean isConsumer(ImageConsumer ic) {
return ImageConsumerQueue.isConsumer(queue, ic);
}
public void removeConsumer(ImageConsumer ic) {
queue = ImageConsumerQueue.removeConsumer(queue, ic, false);
if (!finished && queue == null) {
abort();
}
}
protected ImageConsumerQueue nextConsumer(ImageConsumerQueue cq) {
synchronized (source) {
if (aborted) {
return null;
}
cq = ((cq == null) ? queue : cq.next);
while (cq != null) {
if (cq.interested) {
return cq;
}
cq = cq.next;
}
}
return null;
}
protected int setDimensions(int w, int h) {
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setDimensions(w, h);
count++;
}
return count;
}
protected int setProperties(Hashtable props) {
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setProperties(props);
count++;
}
return count;
}
protected int setColorModel(ColorModel model) {
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setColorModel(model);
count++;
}
return count;
}
protected int setHints(int hints) {
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setHints(hints);
count++;
}
return count;
}
protected void headerComplete() {
feeder.setPriority(ImageFetcher.LOW_PRIORITY);
}
protected int setPixels(int x, int y, int w, int h, ColorModel model,
byte pix[], int off, int scansize) {
source.latchConsumers(this);
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize);
count++;
}
return count;
}
protected int setPixels(int x, int y, int w, int h, ColorModel model,
int pix[], int off, int scansize) {
source.latchConsumers(this);
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize);
count++;
}
return count;
}
protected int imageComplete(int status, boolean done) {
source.latchConsumers(this);
if (done) {
finished = true;
source.doneDecoding(this);
}
ImageConsumerQueue cq = null;
int count = 0;
while ((cq = nextConsumer(cq)) != null) {
cq.consumer.imageComplete(status);
count++;
}
return count;
}
// J2SE
// Fixed 4522041: Redundant image data increases footprint
/*
public void replayConsumer(ImageConsumer ic) {}
public abstract boolean catchupConsumer(InputStreamImageSource src,
ImageConsumer ic);
*/
public abstract void produceImage() throws IOException,
ImageFormatException;
public void abort() {
aborted = true;
source.doneDecoding(this);
close();
AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
feeder.interrupt();
return null;
}
}
);
}
public synchronized void close() {
if (input != null) {
try {
input.close();
} catch (IOException e) {}
}
}
}