001/* Copyright (C) 2004  Free Software Foundation
002
003This file is part of GNU Classpath.
004
005GNU Classpath is free software; you can redistribute it and/or modify
006it under the terms of the GNU General Public License as published by
007the Free Software Foundation; either version 2, or (at your option)
008any later version.
009
010GNU Classpath is distributed in the hope that it will be useful, but
011WITHOUT ANY WARRANTY; without even the implied warranty of
012MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013General Public License for more details.
014
015You should have received a copy of the GNU General Public License
016along with GNU Classpath; see the file COPYING.  If not, write to the
017Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01802110-1301 USA.
019
020Linking this library statically or dynamically with other modules is
021making a combined work based on this library.  Thus, the terms and
022conditions of the GNU General Public License cover the whole
023combination.
024
025As a special exception, the copyright holders of this library give you
026permission to link this library with independent modules to produce an
027executable, regardless of the license terms of these independent
028modules, and to copy and distribute the resulting executable under
029terms of your choice, provided that you also meet, for each linked
030independent module, the terms and conditions of the license of that
031module.  An independent module is a module which is not derived from
032or based on this library.  If you modify this library, you may extend
033this exception to your version of the library, but you are not
034obligated to do so.  If you do not wish to do so, delete this
035exception statement from your version. */
036
037package java.awt.image;
038
039import java.awt.Point;
040
041/**
042 * The BufferedImageFilter class wraps BufferedImageOp objects in a Filter.
043 *
044 * When pixels are pushed through the filter, we create a BufferedImage,
045 * apply the BufferedImageOp, and pass the filtered pixels to the base class.
046 *
047 * @author jlquinn@optonline.net
048 */
049public class BufferedImageFilter extends ImageFilter implements Cloneable
050{
051  private BufferedImageOp op;
052
053  /**
054   *
055   */
056  public BufferedImageFilter(BufferedImageOp op)
057  {
058    super();
059    if (op == null)
060      throw new NullPointerException("BufferedImageFilter null"
061                                     + " op in constructor");
062    this.op = op;
063  }
064
065  /**
066   * @return Returns the contained BufferedImageOp.
067   */
068  public BufferedImageOp getBufferedImageOp()
069  {
070    return op;
071  }
072
073  // FIXME: Definitely not sure this is the right thing.  I'm not sure how to
074  // create a compatible sample model that incorporates scansize != w.  I
075  // asume off is handled by the db itself.
076  public void setPixels(int x, int y, int w, int h, ColorModel model,
077                        byte[] pixels, int off, int scansize)
078  {
079    // Create an input BufferedImage
080    DataBufferByte db = new DataBufferByte(pixels, scansize * h + off, off);
081    SampleModel sm = model.createCompatibleSampleModel(scansize, h);
082    WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));
083    BufferedImage in =
084      new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
085    BufferedImage out = op.createCompatibleDestImage(in, model);
086    op.filter(in, out);
087    DataBuffer dbout = out.getRaster().getDataBuffer();
088    super.setPixels(0, 0, w, h, model, ((DataBufferByte)dbout).getData(), 0,
089                    scansize);
090  }
091
092  // FIXME: Definitely not sure this is the right thing.  I'm not sure how
093  // to create a compatible sample model that incorporates
094  // scansize != w.  I asume off is handled by the db itself.
095  public void setPixels(int x, int y, int w, int h, ColorModel model,
096                        int[] pixels, int off, int scansize)
097  {
098    // Create an input BufferedImage
099    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}