Source Code Cross Referenced for FilteredImageSource.java in  » 6.0-JDK-Modules » j2me » java » awt » image » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt.image 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)FilteredImageSource.java	1.26 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.awt.image;
029:
030:        import java.awt.Image;
031:        import java.awt.image.ImageFilter;
032:        import java.awt.image.ImageConsumer;
033:        import java.awt.image.ImageProducer;
034:        import java.util.Hashtable;
035:        import java.awt.image.ColorModel;
036:
037:        /**
038:         * This class is an implementation of the ImageProducer interface which
039:         * takes an existing image and a filter object and uses them to produce
040:         * image data for a new filtered version of the original image.
041:         * Here is an example which filters an image by swapping the red and
042:         * blue compents:
043:         * <pre>
044:         * 
045:         *	Image src = getImage("doc:///demo/images/duke/T1.gif");
046:         *	ImageFilter colorfilter = new RedBlueSwapFilter();
047:         *	Image img = createImage(new FilteredImageSource(src.getSource(),
048:         *							colorfilter));
049:         * 
050:         * </pre>
051:         *
052:         * @see ImageProducer
053:         *
054:         * @version	1.22 08/19/02
055:         * @author 	Jim Graham
056:         */
057:        public class FilteredImageSource implements  ImageProducer {
058:            ImageProducer src;
059:            ImageFilter filter;
060:
061:            /**
062:             * Constructs an ImageProducer object from an existing ImageProducer
063:             * and a filter object.
064:             * @see ImageFilter
065:             * @see java.awt.Component#createImage
066:             */
067:            public FilteredImageSource(ImageProducer orig, ImageFilter imgf) {
068:                src = orig;
069:                filter = imgf;
070:            }
071:
072:            private Hashtable proxies;
073:
074:            /**
075:             * Adds an ImageConsumer to the list of consumers interested in
076:             * data for this image.
077:             * @see ImageConsumer
078:             */
079:            public synchronized void addConsumer(ImageConsumer ic) {
080:                if (proxies == null) {
081:                    proxies = new Hashtable();
082:                }
083:                if (!proxies.containsKey(ic)) {
084:                    ImageFilter imgf = filter.getFilterInstance(ic);
085:                    proxies.put(ic, imgf);
086:                    src.addConsumer(imgf);
087:                }
088:            }
089:
090:            /**
091:             * Determines whether an ImageConsumer is on the list of consumers 
092:             * currently interested in data for this image.
093:             * @return true if the ImageConsumer is on the list; false otherwise
094:             * @see ImageConsumer
095:             */
096:            public synchronized boolean isConsumer(ImageConsumer ic) {
097:                return (proxies != null && proxies.containsKey(ic));
098:            }
099:
100:            /**
101:             * Removes an ImageConsumer from the list of consumers interested in
102:             * data for this image.
103:             * @see ImageConsumer
104:             */
105:            public synchronized void removeConsumer(ImageConsumer ic) {
106:                if (proxies != null) {
107:                    ImageFilter imgf = (ImageFilter) proxies.get(ic);
108:                    if (imgf != null) {
109:                        src.removeConsumer(imgf);
110:                        proxies.remove(ic);
111:                        if (proxies.isEmpty()) {
112:                            proxies = null;
113:                        }
114:                    }
115:                }
116:            }
117:
118:            /**
119:             * Adds an ImageConsumer to the list of consumers interested in
120:             * data for this image, and immediately starts delivery of the
121:             * image data through the ImageConsumer interface.
122:             * @see ImageConsumer
123:             */
124:            public void startProduction(ImageConsumer ic) {
125:                if (proxies == null) {
126:                    proxies = new Hashtable();
127:                }
128:                ImageFilter imgf = (ImageFilter) proxies.get(ic);
129:                if (imgf == null) {
130:                    imgf = filter.getFilterInstance(ic);
131:                    proxies.put(ic, imgf);
132:                }
133:                src.startProduction(imgf);
134:            }
135:
136:            /**
137:             * Requests that a given ImageConsumer have the image data delivered
138:             * one more time in top-down, left-right order.  The request is
139:             * handed to the ImageFilter for further processing, since the
140:             * ability to preserve the pixel ordering depends on the filter.
141:             * @see ImageConsumer
142:             */
143:            public void requestTopDownLeftRightResend(ImageConsumer ic) {
144:                if (proxies != null) {
145:                    ImageFilter imgf = (ImageFilter) proxies.get(ic);
146:                    if (imgf != null) {
147:                        imgf.resendTopDownLeftRight(src);
148:                    }
149:                }
150:            }
151:        }
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