Source for java.awt.image.renderable.RenderableImageProducer

   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