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

   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: