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.nio.ByteOrder;
  46: import java.util.Hashtable;
  47: 
  48: /**
  49:  * Helper class to GtkImage. Sits and gathers pixels for a GtkImage and then
  50:  * calls GtkImage.setImage().
  51:  *
  52:  * @author Sven de Marothy
  53:  */
  54: public class GtkImageConsumer implements ImageConsumer
  55: {
  56:   private GtkImage target;
  57:   private int width, height;
  58:   private Hashtable<?,?> properties;
  59:   private int[] pixelCache = null;
  60:   private ImageProducer source;
  61: 
  62:   public GtkImageConsumer(GtkImage target, ImageProducer source)
  63:   {
  64:     this.target = target;
  65:     this.source = source;
  66:   }
  67: 
  68:   public synchronized void imageComplete (int status)
  69:   {
  70:     // we need to reuse the pixel cache for memory image sources since
  71:     // a memory image's backing array can be updated "live".
  72:     if (!(source instanceof MemoryImageSource))
  73:       source.removeConsumer(this);
  74:     target.setImage(width, height, pixelCache, properties);
  75:   }
  76: 
  77:   public synchronized void setColorModel (ColorModel model)
  78:   {
  79:     // This method is to inform on what the most used color model
  80:     // in the image is, for optimization reasons. We ignore this
  81:     // information.
  82:   }
  83: 
  84:   public synchronized void setDimensions (int width, int height)
  85:   {
  86:     pixelCache = new int[width*height];
  87: 
  88:     this.width = width;
  89:     this.height = height;
  90:   }
  91: 
  92:   public synchronized void setHints (int flags)
  93:   {
  94:     // This method informs us in which order the pixels are
  95:     // delivered, for progressive-loading support, etc.
  96:     // Since we wait until it's all loaded, we can ignore the hints.
  97:   }
  98: 
  99:   public synchronized void setPixels (int x, int y, int width, int height,
 100:                                       ColorModel cm, byte[] pixels,
 101:                                       int offset, int scansize)
 102:   {
 103:     setPixels (x, y, width, height, cm, convertPixels (pixels), offset,
 104:                scansize);
 105:   }
 106: 
 107:   public synchronized void setPixels (int x, int y, int width, int height,
 108:                                       ColorModel cm, int[] pixels,
 109:                                       int offset, int scansize)
 110:   {
 111:     if (pixelCache == null)
 112:       return; // Not sure this should ever happen.
 113: 
 114:     if (cm.equals(GtkImage.nativeModel))
 115:       for (int i = 0; i < height; i++)
 116:         System.arraycopy (pixels, offset + (i * scansize),
 117:                           pixelCache, (y + i) * this.width + x,
 118:                           width);
 119:     else
 120:       {
 121:         if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN)
 122:           {
 123:             for (int i = 0; i < height; i++)
 124:               for (int j = 0; j < width; j++)
 125:                 {
 126:                   // get in RRGGBBAA and convert to AARRGGBB
 127:                   int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
 128:                   int a = ((pix & 0xFF000000) >> 24) & 0xFF;
 129:                   int rgb = (pix & 0x00FFFFFF) << 8;
 130:                   pix = rgb | a;
 131:                   pixelCache[(y + i) * this.width + x + j] = pix;
 132:                 }
 133:           }
 134:         else
 135:           {
 136:             for (int i = 0; i < height; i++)
 137:               for (int j = 0; j < width; j++)
 138:                 {
 139:                   // get in AARRGGBB and convert to AABBGGRR
 140:                   int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
 141:                   byte b = (byte)(pix & 0xFF);
 142:                   byte r = (byte)(((pix & 0x00FF0000) >> 16) & 0xFF);
 143:                   pix &= 0xFF00FF00;
 144:                   pix |= ((b & 0xFF) << 16);
 145:                   pix |= (r & 0xFF);
 146:                   pixelCache[(y + i) * this.width + x + j] = pix;
 147:                 }
 148:           }
 149:       }
 150:   }
 151: 
 152:   /**
 153:    * This is an old method, no idea if it's correct.
 154:    */
 155:   private int[] convertPixels (byte[] pixels)
 156:   {
 157:     int ret[] = new int[pixels.length];
 158: 
 159:     for (int i = 0; i < pixels.length; i++)
 160:       ret[i] = pixels[i] & 0xFF;
 161: 
 162:     return ret;
 163:   }
 164: 
 165:   public synchronized void setProperties (Hashtable<?,?> props)
 166:   {
 167:     this.properties = props;
 168:   }
 169: }