old-autovect-branch/libjava/classpath/gnu/java/awt/peer/gtk/GtkImageConsumer.java

   1 /* GtkImageConsumer.java
   2    Copyright (C) 2005 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.Graphics;
  42 import java.awt.Image;
  43 import java.awt.image.ColorModel;
  44 import java.awt.image.DirectColorModel;
  45 import java.awt.image.ImageConsumer;
  46 import java.awt.image.ImageObserver;
  47 import java.awt.image.ImageProducer;
  48 import java.awt.image.MemoryImageSource;
  49 import java.util.Hashtable;
  50 import java.util.Vector;
  51
  52 /**
  53  * Helper class to GtkImage. Sits and gathers pixels for a GtkImage and then
  54  * calls GtkImage.setImage().
  55  *
  56  * @author Sven de Marothy
  57  */
  58 public class GtkImageConsumer implements ImageConsumer
  59 {
  60   private GtkImage target;
  61   private int width, height;
  62   private Hashtable properties;
  63   private int[] pixelCache = null;
  64   private ImageProducer source;
  65
  66   public GtkImageConsumer(GtkImage target, ImageProducer source)
  67   {
  68     this.target = target;
  69     this.source = source;
  70   }
  71
  72   public synchronized void imageComplete (int status)
  73   {
  74     // we need to reuse the pixel cache for memory image sources since
  75     // a memory image's backing array can be updated "live".
  76     if (!(source instanceof MemoryImageSource))
  77       source.removeConsumer(this);
  78     target.setImage(width, height, pixelCache, properties);
  79   }
  80
  81   public synchronized void setColorModel (ColorModel model)
  82   {
  83     // This method is to inform on what the most used color model
  84     // in the image is, for optimization reasons. We ignore this
  85     // information.
  86   }
  87
  88   public synchronized void setDimensions (int width, int height)
  89   {
  90     pixelCache = new int[width*height];
  91
  92     this.width = width;
  93     this.height = height;
  94   }
  95
  96   public synchronized void setHints (int flags)
  97   {
  98     // This method informs us in which order the pixels are
  99     // delivered, for progressive-loading support, etc.
 100     // Since we wait until it's all loaded, we can ignore the hints.
 101   }
 102
 103   public synchronized void setPixels (int x, int y, int width, int height,
 104                                       ColorModel cm, byte[] pixels,
 105                                       int offset, int scansize)
 106   {
 107     setPixels (x, y, width, height, cm, convertPixels (pixels), offset,
 108                scansize);
 109   }
 110
 111   public synchronized void setPixels (int x, int y, int width, int height,
 112                                       ColorModel cm, int[] pixels,
 113                                       int offset, int scansize)
 114   {
 115     if (pixelCache == null)
 116       return; // Not sure this should ever happen.
 117
 118     if (cm.equals(GtkImage.nativeModel))
 119       for (int i = 0; i < height; i++)
 120         System.arraycopy (pixels, offset + (i * scansize),
 121                           pixelCache, (y + i) * this.width + x,
 122                           width);
 123     else
 124       {
 125         for (int i = 0; i < height; i++)
 126           for (int j = 0; j < width; j++)
 127             {
 128               // get in AARRGGBB and convert to AABBGGRR
 129               int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
 130               byte b = (byte)(pix & 0xFF);
 131               byte r = (byte)(((pix & 0x00FF0000) >> 16) & 0xFF);
 132               pix &= 0xFF00FF00;
 133               pix |= ((b & 0xFF) << 16);
 134               pix |= (r & 0xFF);
 135               pixelCache[(y + i) * this.width + x + j] = pix;
 136             }
 137       }
 138   }
 139
 140   /**
 141    * This is an old method, no idea if it's correct.
 142    */
 143   private int[] convertPixels (byte[] pixels)
 144   {
 145     int ret[] = new int[pixels.length];
 146
 147     for (int i = 0; i < pixels.length; i++)
 148       ret[i] = pixels[i] & 0xFF;
 149
 150     return ret;
 151   }
 152
 153   public synchronized void setProperties (Hashtable props)
 154   {
 155     this.properties = props;
 156   }
 157 }
 158
 159