126 lines
4.1 KiB
Java
126 lines
4.1 KiB
Java
/* 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);
|
|
}
|
|
}
|
|
|