Source for gnu.java.awt.peer.gtk.GtkImageConsumer

   1: /* GtkImageConsumer.java
   2:    Copyright (C) 2005, 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 gnu.java.awt.peer.gtk;
  40: 
  41: import java.awt.image.ColorModel;
  42: import java.awt.image.ImageConsumer;
  43: import java.awt.image.ImageProducer;
  44: import java.awt.image.MemoryImageSource;
  45: import java.util.Hashtable;
  46: 
  47: /**
  48:  * Helper class to GtkImage. Sits and gathers pixels for a GtkImage and then
  49:  * calls GtkImage.setImage().
  50:  *
  51:  * @author Sven de Marothy
  52:  */
  53: public class GtkImageConsumer implements ImageConsumer
  54: {
  55:   private GtkImage target;
  56:   private int width, height;
  57:   private Hashtable properties;
  58:   private int[] pixelCache = null;
  59:   private ImageProducer source;
  60: 
  61:   public GtkImageConsumer(GtkImage target, ImageProducer source)
  62:   {
  63:     this.target = target;
  64:     this.source = source;
  65:   }
  66: 
  67:   public synchronized void imageComplete (int status)
  68:   {
  69:     // we need to reuse the pixel cache for memory image sources since
  70:     // a memory image's backing array can be updated "live".
  71:     if (!(source instanceof MemoryImageSource))
  72:       source.removeConsumer(this);
  73:     target.setImage(width, height, pixelCache, properties);
  74:   }
  75: 
  76:   public synchronized void setColorModel (ColorModel model)
  77:   {
  78:     // This method is to inform on what the most used color model
  79:     // in the image is, for optimization reasons. We ignore this
  80:     // information.
  81:   }
  82: 
  83:   public synchronized void setDimensions (int width, int height)
  84:   {
  85:     pixelCache = new int[width*height];
  86: 
  87:     this.width = width;
  88:     this.height = height;
  89:   }
  90: 
  91:   public synchronized void setHints (int flags)
  92:   {
  93:     // This method informs us in which order the pixels are
  94:     // delivered, for progressive-loading support, etc. 
  95:     // Since we wait until it's all loaded, we can ignore the hints.
  96:   }
  97: 
  98:   public synchronized void setPixels (int x, int y, int width, int height, 
  99:                       ColorModel cm, byte[] pixels,
 100:                       int offset, int scansize)
 101:   {
 102:     setPixels (x, y, width, height, cm, convertPixels (pixels), offset,
 103:                scansize);
 104:   }
 105: 
 106:   public synchronized void setPixels (int x, int y, int width, int height, 
 107:                       ColorModel cm, int[] pixels,
 108:                       int offset, int scansize)
 109:   {
 110:     if (pixelCache == null)
 111:       return; // Not sure this should ever happen.
 112: 
 113:     if (cm.equals(GtkImage.nativeModel))
 114:       for (int i = 0; i < height; i++)
 115:     System.arraycopy (pixels, offset + (i * scansize),
 116:               pixelCache, (y + i) * this.width + x,
 117:               width);
 118:     else
 119:       {
 120:     for (int i = 0; i < height; i++)
 121:       for (int j = 0; j < width; j++)
 122:         {
 123:           // get in AARRGGBB and convert to AABBGGRR
 124:           int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
 125:           byte b = (byte)(pix & 0xFF);
 126:           byte r = (byte)(((pix & 0x00FF0000) >> 16) & 0xFF);
 127:           pix &= 0xFF00FF00;
 128:           pix |= ((b & 0xFF) << 16);
 129:           pix |= (r & 0xFF);
 130:           pixelCache[(y + i) * this.width + x + j] = pix;
 131:         }
 132:       }
 133:   }
 134: 
 135:   /**
 136:    * This is an old method, no idea if it's correct.
 137:    */
 138:   private int[] convertPixels (byte[] pixels)
 139:   {
 140:     int ret[] = new int[pixels.length];
 141: 
 142:     for (int i = 0; i < pixels.length; i++)
 143:       ret[i] = pixels[i] & 0xFF;
 144:     
 145:     return ret;
 146:   }
 147: 
 148:   public synchronized void setProperties (Hashtable props)
 149:   {
 150:     this.properties = props;
 151:   }
 152: }
 153: