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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java b/libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java new file mode 100644 index 000000000..786dcf26b --- /dev/null +++ b/libjava/classpath/gnu/java/awt/peer/gtk/AsyncImage.java @@ -0,0 +1,283 @@ +/* AsyncImage.java -- Loads images asynchronously + Copyright (C) 2006 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.peer.gtk; + +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.net.URL; +import java.util.ArrayList; +import java.util.HashSet; +import java.util.Iterator; + +/** + * Supports asynchronous loading of images. + */ +public class AsyncImage + extends Image +{ + + /** + * Returned as source as long as the image is not complete. + */ + private class NullImageSource + implements ImageProducer + { + private ArrayList<ImageConsumer> consumers; + + NullImageSource() + { + consumers = new ArrayList<ImageConsumer>(); + } + + public void addConsumer(ImageConsumer ic) + { + consumers.add(ic); + } + + public boolean isConsumer(ImageConsumer ic) + { + return consumers.contains(ic); + } + + public void removeConsumer(ImageConsumer ic) + { + consumers.remove(ic); + } + + public void requestTopDownLeftRightResend(ImageConsumer ic) + { + startProduction(ic); + } + + public void startProduction(ImageConsumer ic) + { + consumers.add(ic); + for (int i = consumers.size() - 1; i >= 0; i--) + { + ImageConsumer c = (ImageConsumer) consumers.get(i); + c.setDimensions(1, 1); + ic.imageComplete(ImageConsumer.SINGLEFRAMEDONE); + } + } + + } + + /** + * Loads the image asynchronously. + */ + private class Loader + implements Runnable + { + private URL url; + Loader(URL u) + { + url = u; + } + + public void run() + { + Image image; + try + { + GtkImage gtkImage = new GtkImage(url); + image = CairoSurface.getBufferedImage(gtkImage); + } + catch (IllegalArgumentException iae) + { + image = null; + } + realImage = GtkToolkit.imageOrError(image); + synchronized (AsyncImage.this) + { + notifyObservers(ImageObserver.ALLBITS | ImageObserver.HEIGHT + | ImageObserver.WIDTH | ImageObserver.PROPERTIES); + observers = null; // Not needed anymore. + } + } + } + + /** + * The real image. This is null as long as the image is not complete. + */ + Image realImage; + + /** + * The image observers. + * + * This is package private to avoid accessor methods. + */ + HashSet<ImageObserver> observers; + + /** + * Creates a new AsyncImage that loads from the specified URL. + */ + AsyncImage(URL url) + { + observers = new HashSet<ImageObserver>(); + Loader l = new Loader(url); + Thread t = new Thread(l); + t.start(); + } + + 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 int getHeight(ImageObserver observer) + { + addObserver(observer); + int height = 0; + 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() + { + Image r = realImage; + ImageProducer source; + if (r == null) + source = new NullImageSource(); + else + source = r.getSource(); + return source; + } + + public int getWidth(ImageObserver observer) + { + addObserver(observer); + int width = 0; + Image r = realImage; + if (r != null) + width = r.getWidth(observer); + return width; + } + + 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<ImageObserver> observs = observers; + if (observs != null) + { + observs.add(obs); + } + else + { + // When the image is complete, notify the observer. Dunno if + // that's really needed, but to be sure. + obs.imageUpdate(this, ImageObserver.WIDTH + | ImageObserver.HEIGHT + |ImageObserver.ALLBITS + | ImageObserver.PROPERTIES, 0, 0, + realImage.getWidth(null), + realImage.getHeight(null)); + } + } + } + } + + static Image realImage(Image img, ImageObserver obs) + { + if (img instanceof AsyncImage) + { + ((AsyncImage) img).addObserver(obs); + Image r = ((AsyncImage) img).realImage; + if (r != null) + img = r; + } + return img; + } + + void notifyObservers(int status) + { + assert Thread.holdsLock(this); + // This field gets null when image loading is complete. + HashSet observs = observers; + if (observs != null) + { + Image r = realImage; + Iterator i = observs.iterator(); + while (i.hasNext()) + { + ImageObserver obs = (ImageObserver) i.next(); + obs.imageUpdate(this, status, 0, 0, r.getWidth(null), + r.getHeight(null)); + } + } + } + + int checkImage(ImageObserver obs) + { + addObserver(obs); + int flags = 0; + if (realImage != null) + flags = ImageObserver.ALLBITS | ImageObserver.WIDTH + | ImageObserver.HEIGHT | ImageObserver.PROPERTIES; + return flags; + } +} |