libjava/classpath/java/awt/image/renderable/RenderableImageProducer.java

   1 /* RenderableImageProducer.java --
   2    Copyright (C) 2002, 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.awt.image.renderable;
  40
  41 import java.awt.image.ColorModel;
  42 import java.awt.image.DataBuffer;
  43 import java.awt.image.ImageConsumer;
  44 import java.awt.image.ImageProducer;
  45 import java.awt.image.Raster;
  46 import java.awt.image.RenderedImage;
  47 import java.awt.image.SampleModel;
  48 import java.util.ArrayList;
  49 import java.util.Iterator;
  50
  51 public class RenderableImageProducer implements ImageProducer, Runnable
  52 {
  53   private RenderableImage image;
  54   private RenderContext context;
  55   private ArrayList consumers = new ArrayList();
  56
  57   public RenderableImageProducer(RenderableImage image, RenderContext context)
  58   {
  59     this.image = image;
  60     this.context = context;
  61   }
  62
  63   public void setRenderContext(RenderContext context)
  64   {
  65     this.context = context;
  66   }
  67
  68   public void addConsumer(ImageConsumer consumer)
  69   {
  70     synchronized (consumers)
  71       {
  72         if (! consumers.contains(consumer))
  73           consumers.add(consumer);
  74       }
  75   }
  76
  77   public boolean isConsumer(ImageConsumer consumer)
  78   {
  79     synchronized (consumers)
  80       {
  81         return consumers.contains(consumer);
  82       }
  83   }
  84
  85   public void removeConsumer(ImageConsumer consumer)
  86   {
  87     synchronized (consumers)
  88       {
  89         consumers.remove(consumer);
  90       }
  91   }
  92
  93   public void startProduction(ImageConsumer consumer)
  94   {
  95     addConsumer(consumer);
  96     Thread t = new Thread(this, "RenderableImageProducerWorker");
  97     t.start();
  98   }
  99
 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