[gui] Add BufferedImageFilter

[Jerry Quinn <jlquinn at optonline dot net>]

New implementation of BufferedImageFilter.  I *think* it's OK, but someone who 
knows more about Java2D should look at it.

Thanks,
Jerry Quinn

2004-10-04  Jerry Quinn  <jlquinn@optonline.net>

	* java/awt/image/BufferedImageFilter.java: Implement.

Index: java/awt/image/BufferedImageFilter.java
===================================================================
RCS file: java/awt/image/BufferedImageFilter.java
diff -N java/awt/image/BufferedImageFilter.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ java/awt/image/BufferedImageFilter.java	5 Oct 2004 02:23:38 -0000	1.1.2.1
@@ -0,0 +1,110 @@
+/* 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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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);
+  }
+}