From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../classpath/gnu/java/awt/image/AsyncImage.java | 300 +++++++++++++++++++++ 1 file changed, 300 insertions(+) create mode 100644 libjava/classpath/gnu/java/awt/image/AsyncImage.java (limited to 'libjava/classpath/gnu/java/awt/image/AsyncImage.java') diff --git a/libjava/classpath/gnu/java/awt/image/AsyncImage.java b/libjava/classpath/gnu/java/awt/image/AsyncImage.java new file mode 100644 index 000000000..4fa33740e --- /dev/null +++ b/libjava/classpath/gnu/java/awt/image/AsyncImage.java @@ -0,0 +1,300 @@ +/* AsyncImage.java -- Loads images asynchronously + Copyright (C) 2008 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.image; + + +import java.awt.Graphics; +import java.awt.Image; +import java.awt.image.ImageConsumer; +import java.awt.image.ImageObserver; +import java.awt.image.ImageProducer; +import java.util.HashSet; +import java.util.Iterator; + +/** + * Supports asynchronous loading of images. + */ +public class AsyncImage + extends Image +{ + + /** + * The image source for AsyncImages. + */ + private class AsyncImageSource + implements ImageProducer + { + /** + * The real image source, if already present, or null + * otherwise. + */ + private ImageProducer realSource; + + public void addConsumer(ImageConsumer ic) + { + startProduction(ic); + } + + public boolean isConsumer(ImageConsumer ic) + { + return false; + } + + public void removeConsumer(ImageConsumer ic) + { + // Nothing to do here. + } + + public void requestTopDownLeftRightResend(ImageConsumer ic) + { + startProduction(ic); + } + + public void startProduction(ImageConsumer ic) + { + ImageProducer ip = getRealSource(); + if (ip == null) + { + ic.setDimensions(1, 1); + ic.imageComplete(ImageConsumer.SINGLEFRAMEDONE); + } + else + { + ip.startProduction(ic); + } + } + + /** + * Returns the real image source, if already present. Otherwise, this + * returns null. + * + * @return the real image source, or null if not present + */ + private ImageProducer getRealSource() + { + synchronized (AsyncImage.this) + { + ImageProducer source = realSource; + if (source == null) + { + Image ri = realImage; + if (ri != null) + { + realSource = source = ri.getSource(); + } + } + return source; + } + } + } + + /** + * The real image. This is null as long as the image is not complete. + */ + private volatile Image realImage; + + /** + * The image observers. + * + * This is package private to avoid accessor methods. + */ + HashSet observers; + + private volatile boolean complete = false; + + /** + * Creates a new AsyncImage. + */ + AsyncImage() + { + observers = new HashSet(); + } + + public void flush() + { + // Nothing to do here. + } + + public Graphics getGraphics() + { + Image r = realImage; + Graphics g = null; + if (r != null) + g = r.getGraphics(); // Should we return some dummy graphics instead? + return g; + } + + public boolean isComplete() { + return complete; + } + + public int getHeight(ImageObserver observer) + { + addObserver(observer); + int height = -1; + waitForImage(observer); + Image r = realImage; + if (r != null) + height = r.getHeight(observer); + return height; + } + + public Object getProperty(String name, ImageObserver observer) + { + addObserver(observer); + Image r = realImage; + Object prop = null; + if (r != null) + prop = r.getProperty(name, observer); + return prop; + } + + public ImageProducer getSource() + { + return new AsyncImageSource(); + } + + public int getWidth(ImageObserver observer) + { + addObserver(observer); + int width = -1; + waitForImage(observer); + Image r = realImage; + if (r != null) + width = r.getWidth(observer); + return width; + } + + public void addObserver(ImageObserver obs) + { + if (obs != null) + { + synchronized (this) + { + // This field gets null when image loading is complete and we don't + // need to store any more observers. + HashSet observs = observers; + if (observs != null) + { + observs.add(obs); + } + } + } + } + + public boolean prepareImage(int w, int h, ImageObserver obs) + { + addObserver(obs); + return realImage != null; + } + + public int checkImage(int w, int h, ImageObserver obs) + { + addObserver(obs); + int flags = 0; + if (realImage != null) + flags = ImageObserver.ALLBITS | ImageObserver.WIDTH + | ImageObserver.HEIGHT | ImageObserver.PROPERTIES; + return flags; + } + + public Image getRealImage() + { + return realImage; + } + + public void setRealImage(Image im) + { + realImage = im; + int status = ImageObserver.HEIGHT | ImageObserver.WIDTH; + notifyObservers(status, 0, 0, im.getWidth(null), im.getHeight(null)); + } + + public void notifyObservers(int status, int x, int y, int w, int h) + { + synchronized (this) + { + HashSet observs = observers; + if (observs != null) + { + Iterator i = observs.iterator(); + while (i.hasNext()) + { + ImageObserver obs = (ImageObserver) i.next(); + boolean complete = obs.imageUpdate(this, status, x, y, realImage.getWidth(obs), realImage.getHeight(obs)); + if (complete) // Remove completed observers. + i.remove(); + } + } + if ((status & ImageObserver.ALLBITS) != 0) + { + complete = true; + notifyAll(); + } + } + } + + /** + * Waits for the image to be loaded completely, if the image observer + * is null. Otherwise this is not necessary, because the + * image observer can be notified about later completion. + * + * @param observer the image observer + */ + public void waitForImage(ImageObserver observer) + { + if (!complete && observer == null) + { + synchronized (this) + { + while (! complete) + { + try + { + wait(); + } + catch (InterruptedException ex) + { + Thread.currentThread().interrupt(); + } + } + } + } + } +} -- cgit v1.2.3