Source for gnu.java.awt.peer.qt.QtImageConsumer

   1: /* QtImageConsumer.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: package gnu.java.awt.peer.qt;
  39: 
  40: import java.awt.image.ColorModel;
  41: import java.awt.image.ImageConsumer;
  42: import java.awt.image.ImageProducer;
  43: import java.util.Hashtable;
  44: 
  45: /**
  46:  * Helper class to QtImage. Sits and gathers pixels for a QtImage and then
  47:  * calls QtImage.setImage().
  48:  *
  49:  * @author Sven de Marothy
  50:  */
  51: public class QtImageConsumer implements ImageConsumer
  52: {
  53:   private QtImage target;
  54:   private int width, height;
  55:   private Hashtable properties;
  56:   private int[] pixelCache = null;
  57:   private ImageProducer source;
  58: 
  59:   public QtImageConsumer(QtImage target, ImageProducer source)
  60:   {
  61:     this.target = target;
  62:     this.source = source;
  63:   }
  64: 
  65:   public synchronized void imageComplete (int status)
  66:   {
  67:     source.removeConsumer(this);
  68:     target.setImage(width, height, pixelCache, properties);
  69:   }
  70: 
  71:   public synchronized void setColorModel (ColorModel model)
  72:   {
  73:     // This method is to inform on what the most used color model
  74:     // in the image is, for optimization reasons. We ignore this
  75:     // information.
  76:   }
  77: 
  78:   public synchronized void setDimensions (int width, int height)
  79:   {
  80:     pixelCache = new int[width*height];
  81: 
  82:     this.width = width;
  83:     this.height = height;
  84:   }
  85: 
  86:   public synchronized void setHints (int flags)
  87:   {
  88:     // This method informs us in which order the pixels are
  89:     // delivered, for progressive-loading support, etc.
  90:     // Since we wait until it's all loaded, we can ignore the hints.
  91:   }
  92: 
  93:   public synchronized void setPixels (int x, int y, int width, int height,
  94:                                       ColorModel cm, byte[] pixels,
  95:                                       int offset, int scansize)
  96:   {
  97:     setPixels (x, y, width, height, cm, convertPixels (pixels), offset,
  98:                scansize);
  99:   }
 100: 
 101:   public synchronized void setPixels (int x, int y, int width, int height,
 102:                                       ColorModel cm, int[] pixels,
 103:                                       int offset, int scansize)
 104:   {
 105:     if (pixelCache == null)
 106:       return; // Not sure this should ever happen.
 107: 
 108:     if (cm.equals(QtImage.nativeModel))
 109:       for (int i = 0; i < height; i++)
 110:         System.arraycopy (pixels, offset + (i * scansize),
 111:                           pixelCache, (y + i) * this.width + x,
 112:                           width);
 113:     else
 114:       {
 115:         for (int i = 0; i < height; i++)
 116:           for (int j = 0; j < width; j++)
 117:             {
 118:               // get in AARRGGBB and convert to AABBGGRR
 119:               int pix = cm.getRGB(pixels[offset + (i * scansize) + x + j]);
 120:               byte b = (byte)(pix & 0xFF);
 121:               byte r = (byte)(((pix & 0x00FF0000) >> 16) & 0xFF);
 122:               pix &= 0xFF00FF00;
 123:               pix |= ((b & 0xFF) << 16);
 124:               pix |= (r & 0xFF);
 125:               pixelCache[(y + i) * this.width + x + j] = pix;
 126:             }
 127:       }
 128:   }
 129: 
 130:   /**
 131:    * This is an old method, no idea if it's correct.
 132:    */
 133:   private int[] convertPixels (byte[] pixels)
 134:   {
 135:     int ret[] = new int[pixels.length];
 136: 
 137:     for (int i = 0; i < pixels.length; i++)
 138:       ret[i] = pixels[i] & 0xFF;
 139: 
 140:     return ret;
 141:   }
 142: 
 143:   public synchronized void setProperties (Hashtable props)
 144:   {
 145:     this.properties = props;
 146:   }
 147: }