gomp-20050608-branch/libjava/classpath/java/awt/image/BufferedImageFilter.java

   1 /* Copyright (C) 2004  Free Software Foundation
   2
   3 This file is part of GNU Classpath.
   4
   5 GNU Classpath is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Classpath is distributed in the hope that it will be useful, but
  11 WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU Classpath; see the file COPYING.  If not, write to the
  17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 02110-1301 USA.
  19
  20 Linking this library statically or dynamically with other modules is
  21 making a combined work based on this library.  Thus, the terms and
  22 conditions of the GNU General Public License cover the whole
  23 combination.
  24
  25 As a special exception, the copyright holders of this library give you
  26 permission to link this library with independent modules to produce an
  27 executable, regardless of the license terms of these independent
  28 modules, and to copy and distribute the resulting executable under
  29 terms of your choice, provided that you also meet, for each linked
  30 independent module, the terms and conditions of the license of that
  31 module.  An independent module is a module which is not derived from
  32 or based on this library.  If you modify this library, you may extend
  33 this exception to your version of the library, but you are not
  34 obligated to do so.  If you do not wish to do so, delete this
  35 exception statement from your version. */
  36
  37 package java.awt.image;
  38
  39 import java.awt.Point;
  40
  41 /**
  42  * The BufferedImageFilter class wraps BufferedImageOp objects in a Filter.
  43  *
  44  * When pixels are pushed through the filter, we create a BufferedImage,
  45  * apply the BufferedImageOp, and pass the filtered pixels to the base class.
  46  *
  47  * @author jlquinn@optonline.net
  48  */
  49 public class BufferedImageFilter extends ImageFilter implements Cloneable
  50 {
  51   private BufferedImageOp op;
  52
  53   /**
  54    *
  55    */
  56   public BufferedImageFilter(BufferedImageOp op)
  57   {
  58     super();
  59     if (op == null)
  60       throw new NullPointerException("BufferedImageFilter null"
  61                                      + " op in constructor");
  62     this.op = op;
  63   }
  64
  65   /**
  66    * @return Returns the contained BufferedImageOp.
  67    */
  68   public BufferedImageOp getBufferedImageOp()
  69   {
  70     return op;
  71   }
  72
  73   // FIXME: Definitely not sure this is the right thing.  I'm not sure how to
  74   // create a compatible sample model that incorporates scansize != w.  I
  75   // asume off is handled by the db itself.
  76   public void setPixels(int x, int y, int w, int h, ColorModel model,
  77                         byte[] pixels, int off, int scansize)
  78   {
  79     // Create an input BufferedImage
  80     DataBufferByte db = new DataBufferByte(pixels, scansize * h + off, off);
  81     SampleModel sm = model.createCompatibleSampleModel(scansize, h);
  82     WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));
  83     BufferedImage in =
  84       new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
  85     BufferedImage out = op.createCompatibleDestImage(in, model);
  86     op.filter(in, out);
  87     DataBuffer dbout = out.getRaster().getDataBuffer();
  88     super.setPixels(0, 0, w, h, model, ((DataBufferByte)dbout).getData(), 0,
  89                     scansize);
  90   }
  91
  92   // FIXME: Definitely not sure this is the right thing.  I'm not sure how
  93   // to create a compatible sample model that incorporates
  94   // scansize != w.  I asume off is handled by the db itself.
  95   public void setPixels(int x, int y, int w, int h, ColorModel model,
  96                         int[] pixels, int off, int scansize)
  97   {
  98     // Create an input BufferedImage
  99     DataBufferInt db = new DataBufferInt(pixels, scansize * h + off, off);
 100     SampleModel sm = model.createCompatibleSampleModel(scansize, h);
 101     WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));
 102     BufferedImage in =
 103       new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
 104     BufferedImage out = op.createCompatibleDestImage(in, model);
 105     op.filter(in, out);
 106     DataBuffer dbout = out.getRaster().getDataBuffer();
 107     super.setPixels(0, 0, w, h, model, ((DataBufferInt)dbout).getData(), 0,
 108                     scansize);
 109   }
 110 }