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