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/* Copyright (C) 2004  Free Software Foundation

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.awt.image;

import java.awt.Point;

/**

 * The BufferedImageFilter class wraps BufferedImageOp objects in a Filter.

 *

 * When pixels are pushed through the filter, we create a BufferedImage,

 * apply the BufferedImageOp, and pass the filtered pixels to the base class.

 *

 * @author jlquinn@optonline.net

 */

public class BufferedImageFilter extends ImageFilter implements Cloneable

{

  private BufferedImageOp op;

  /**

   *

   */

  public BufferedImageFilter(BufferedImageOp op)

  {

    super();

    if (op == null)

      throw new NullPointerException("BufferedImageFilter null"

                                     + " op in constructor");

    this.op = op;

  }

  /**

   * @return Returns the contained BufferedImageOp.

   */

  public BufferedImageOp getBufferedImageOp()

  {

    return op;

  }

  // FIXME: Definitely not sure this is the right thing.  I'm not sure how to

  // create a compatible sample model that incorporates scansize != w.  I

  // asume off is handled by the db itself.

  public void setPixels(int x, int y, int w, int h, ColorModel model,

                        byte[] pixels, int off, int scansize)

  {

    // Create an input BufferedImage

    DataBufferByte db = new DataBufferByte(pixels, scansize * h + off, off);

    SampleModel sm = model.createCompatibleSampleModel(scansize, h);

    WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));

    BufferedImage in =

      new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);

    BufferedImage out = op.createCompatibleDestImage(in, model);

    op.filter(in, out);

    DataBuffer dbout = out.getRaster().getDataBuffer();

    super.setPixels(0, 0, w, h, model, ((DataBufferByte)dbout).getData(), 0,

                    scansize);

  }

  // FIXME: Definitely not sure this is the right thing.  I'm not sure how

  // to create a compatible sample model that incorporates

  // scansize != w.  I asume off is handled by the db itself.

  public void setPixels(int x, int y, int w, int h, ColorModel model,

                        int[] pixels, int off, int scansize)

  {

    // Create an input BufferedImage

    DataBufferInt db = new DataBufferInt(pixels, scansize * h + off, off);

    SampleModel sm = model.createCompatibleSampleModel(scansize, h);

    WritableRaster wr = new WritableRaster(sm, db, new Point(0, 0));

    BufferedImage in =

      new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);

    BufferedImage out = op.createCompatibleDestImage(in, model);

    op.filter(in, out);

    DataBuffer dbout = out.getRaster().getDataBuffer();

    super.setPixels(0, 0, w, h, model, ((DataBufferInt)dbout).getData(), 0,

                    scansize);

  }

}