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author | tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-07-16 00:30:23 +0000 |
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committer | tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-07-16 00:30:23 +0000 |
commit | c8875fb97fc03779a5bba09872227b1d08e5d52a (patch) | |
tree | a0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/awt/image/FilteredImageSource.java | |
parent | c40c1730800ed292b6db39a83d592476fa59623c (diff) | |
download | ppe42-gcc-c8875fb97fc03779a5bba09872227b1d08e5d52a.tar.gz ppe42-gcc-c8875fb97fc03779a5bba09872227b1d08e5d52a.zip |
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/classpath/java/awt/image/FilteredImageSource.java')
-rw-r--r-- | libjava/classpath/java/awt/image/FilteredImageSource.java | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/FilteredImageSource.java b/libjava/classpath/java/awt/image/FilteredImageSource.java new file mode 100644 index 00000000000..8893e86a625 --- /dev/null +++ b/libjava/classpath/java/awt/image/FilteredImageSource.java @@ -0,0 +1,125 @@ +/* FilteredImageSource.java -- Java class for providing image data + Copyright (C) 1999 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 java.awt.image; + +import java.util.Hashtable; + +/** + * + * @see ImageConsumer + * @author C. Brian Jones (cbj@gnu.org) + */ +public class FilteredImageSource implements ImageProducer +{ + ImageProducer ip; + ImageFilter filter; + Hashtable consumers = new Hashtable(); + + /** + * The given filter is applied to the given image producer + * to create a new image producer. + */ + public FilteredImageSource(ImageProducer ip, ImageFilter filter) { + this.ip = ip; + this.filter = filter; + } + + /** + * Used to register an <code>ImageConsumer</code> with this + * <code>ImageProducer</code>. + */ + public synchronized void addConsumer(ImageConsumer ic) { + if (consumers.containsKey(ic)) + return; + + ImageFilter f = filter.getFilterInstance(ic); + consumers.put(ic, f); + ip.addConsumer(f); + } + + /** + * Used to determine if the given <code>ImageConsumer</code> is + * already registered with this <code>ImageProducer</code>. + */ + public synchronized boolean isConsumer(ImageConsumer ic) { + ImageFilter f = (ImageFilter)consumers.get(ic); + if (f != null) + return ip.isConsumer(f); + return false; + } + + /** + * Used to remove an <code>ImageConsumer</code> from the list of + * registered consumers for this <code>ImageProducer</code>. + */ + public synchronized void removeConsumer(ImageConsumer ic) { + ImageFilter f = (ImageFilter)consumers.remove(ic); + if (f != null) + ip.removeConsumer(f); + } + + /** + * Used to register an <code>ImageConsumer</code> with this + * <code>ImageProducer</code> and then immediately start + * reconstruction of the image data to be delivered to all + * registered consumers. + */ + public void startProduction(ImageConsumer ic) { + ImageFilter f; + if (!(consumers.containsKey(ic))) { + f = filter.getFilterInstance(ic); + consumers.put(ic, f); + ip.addConsumer(f); + } else { + f = (ImageFilter)consumers.get( ic ); + } + ip.startProduction(f); + } + + /** + * Used to register an <code>ImageConsumer</code> with this + * <code>ImageProducer</code> and then request that this producer + * resend the image data in the order top-down, left-right. + */ + public void requestTopDownLeftRightResend(ImageConsumer ic) { + ImageFilter f = (ImageFilter)consumers.get(ic); + ip.requestTopDownLeftRightResend(f); + } +} + |