001 /* RenderableImageProducer.java --
002 Copyright (C) 2002, 2006 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath 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 for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.awt.image.renderable;
040
041 import java.awt.image.ColorModel;
042 import java.awt.image.DataBuffer;
043 import java.awt.image.ImageConsumer;
044 import java.awt.image.ImageProducer;
045 import java.awt.image.Raster;
046 import java.awt.image.RenderedImage;
047 import java.awt.image.SampleModel;
048 import java.util.ArrayList;
049 import java.util.Iterator;
050
051 public class RenderableImageProducer implements ImageProducer, Runnable
052 {
053 private RenderableImage image;
054 private RenderContext context;
055 private ArrayList consumers = new ArrayList();
056
057 public RenderableImageProducer(RenderableImage image, RenderContext context)
058 {
059 this.image = image;
060 this.context = context;
061 }
062
063 public void setRenderContext(RenderContext context)
064 {
065 this.context = context;
066 }
067
068 public void addConsumer(ImageConsumer consumer)
069 {
070 synchronized (consumers)
071 {
072 if (! consumers.contains(consumer))
073 consumers.add(consumer);
074 }
075 }
076
077 public boolean isConsumer(ImageConsumer consumer)
078 {
079 synchronized (consumers)
080 {
081 return consumers.contains(consumer);
082 }
083 }
084
085 public void removeConsumer(ImageConsumer consumer)
086 {
087 synchronized (consumers)
088 {
089 consumers.remove(consumer);
090 }
091 }
092
093 public void startProduction(ImageConsumer consumer)
094 {
095 addConsumer(consumer);
096 Thread t = new Thread(this, "RenderableImageProducerWorker");
097 t.start();
098 }
099
100 public void requestTopDownLeftRightResend(ImageConsumer consumer)
101 {
102 // Do nothing. The contract says we can ignore this call, so we do.
103 }
104
105 public void run()
106 {
107 // This isn't ideal but it avoids fail-fast problems.
108 // Alternatively, we could clone 'consumers' here.
109 synchronized (consumers)
110 {
111 RenderedImage newImage;
112 if (context == null)
113 newImage = image.createDefaultRendering();
114 else
115 newImage = image.createRendering(context);
116 Raster newData = newImage.getData();
117 ColorModel colorModel = newImage.getColorModel();
118 if (colorModel == null)
119 colorModel = ColorModel.getRGBdefault();
120 SampleModel sampleModel = newData.getSampleModel();
121 DataBuffer dataBuffer = newData.getDataBuffer();
122 int width = newData.getWidth();
123 int height = newData.getHeight();
124
125 // Initialize the consumers.
126 Iterator it = consumers.iterator();
127 while (it.hasNext())
128 {
129 ImageConsumer target = (ImageConsumer) it.next();
130 target.setHints(ImageConsumer.COMPLETESCANLINES
131 | ImageConsumer.SINGLEFRAME
132 | ImageConsumer.SINGLEPASS
133 | ImageConsumer.TOPDOWNLEFTRIGHT);
134 target.setDimensions(width, height);
135 }
136
137 // Work in scan-line order.
138 int[] newLine = new int[width];
139 int[] bands = new int[sampleModel.getNumBands()];
140 for (int y = 0; y < height; ++y)
141 {
142 for (int x = 0; x < width; ++x)
143 {
144 sampleModel.getPixel(x, y, bands, dataBuffer);
145 newLine[x] = colorModel.getDataElement(bands, 0);
146 }
147
148 // Tell the consumers about the new scan line.
149 it = consumers.iterator();
150 while (it.hasNext())
151 {
152 ImageConsumer target = (ImageConsumer) it.next();
153 target.setPixels(0, y, width, 1, colorModel, newLine, 0, width);
154 }
155 }
156
157 // Tell the consumers that we're done.
158 it = consumers.iterator();
159 while (it.hasNext())
160 {
161 ImageConsumer target = (ImageConsumer) it.next();
162 target.imageComplete(ImageConsumer.STATICIMAGEDONE);
163 }
164 }
165 }
166 } // class RenderableImageProducer