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From-SVN: r102074

1 files changed, 218 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/RescaleOp.java b/libjava/classpath/java/awt/image/RescaleOp.java
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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.RenderingHints;
+import java.awt.geom.Point2D;
+import java.awt.geom.Rectangle2D;
+import java.util.Arrays;
+
+/**
+ * @author Jerry Quinn (jlquinn@optonline.net)
+ */
+public class RescaleOp implements BufferedImageOp, RasterOp
+{
+  private float[] scale;
+  private float[] offsets;
+  private RenderingHints hints = null;
+  
+  public RescaleOp(float[] scaleFactors,
+		   float[] offsets,
+		   RenderingHints hints)
+  {
+    this.scale = scaleFactors;
+    this.offsets = offsets;
+    this.hints = hints;
+  }
+  
+  public RescaleOp(float scaleFactor,
+		   float offset,
+		   RenderingHints hints)
+  {
+    scale = new float[]{ scaleFactor };
+    offsets = new float[]{offset};
+    this.hints = hints;
+  }
+
+  public final float[] getScaleFactors(float[] scaleFactors)
+  {
+    if (scaleFactors == null)
+      scaleFactors = new float[scale.length];
+    System.arraycopy(scale, 0, scaleFactors, 0, scale.length);
+    return scaleFactors;
+  }
+
+  public final float[] getOffsets(float[] offsets)
+  {
+    if (offsets == null)
+      offsets = new float[this.offsets.length];
+    System.arraycopy(this.offsets, 0, offsets, 0, this.offsets.length);
+    return offsets;
+  }
+
+  public final int getNumFactors()
+  {
+    return scale.length;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#getRenderingHints()
+   */
+  public RenderingHints getRenderingHints()
+  {
+    return hints;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
+   */
+  public final BufferedImage filter(BufferedImage src, BufferedImage dst)
+  {
+    // TODO Make sure premultiplied alpha is handled correctly.
+    // TODO See that color conversion is handled.
+    // TODO figure out how to use rendering hints.
+    if (scale.length != offsets.length)
+      throw new IllegalArgumentException();
+
+    ColorModel scm = src.getColorModel();
+    if (dst == null) dst = createCompatibleDestImage(src, null);
+
+    WritableRaster wsrc = src.getRaster();
+    WritableRaster wdst = dst.getRaster();
+    
+    // Share constant across colors except alpha
+    if (scale.length == 1 || scale.length == scm.getNumColorComponents())
+      {
+	// Construct a raster that doesn't include an alpha band.
+	int[] subbands = new int[scm.getNumColorComponents()];
+	for (int i=0; i < subbands.length; i++) subbands[i] = i;
+	wsrc = 
+	  wsrc.createWritableChild(wsrc.minX, wsrc.minY, wsrc.width, wsrc.height,
+				   wsrc.minX, wsrc.minY, subbands);
+      }
+    // else all color bands
+
+    filter(wsrc, wdst);
+    return dst;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#filter(java.awt.image.Raster, java.awt.image.WritableRaster)
+   */
+  public final WritableRaster filter(Raster src, WritableRaster dest)
+  {
+    if (dest == null) dest = src.createCompatibleWritableRaster();
+
+    // Required sanity checks
+    if (src.numBands != dest.numBands || scale.length != offsets.length)
+      throw new IllegalArgumentException();
+    if (scale.length != 1 && scale.length != src.numBands)
+      throw new IllegalArgumentException();
+
+    // Create scaling arrays if needed
+    float[] lscale = scale;
+    float[] loff = offsets;
+    if (scale.length == 1)
+      {
+	lscale = new float[src.numBands];
+	Arrays.fill(lscale, scale[0]);
+	loff = new float[src.numBands];
+	Arrays.fill(loff, offsets[0]);
+      }
+
+    // TODO The efficiency here can be improved for various data storage
+    // patterns, aka SampleModels.
+    float[] pixel = new float[src.numBands];
+    for (int y = src.minY; y < src.height + src.minY; y++)
+      for (int x = src.minX; x < src.width + src.minX; x++)
+	{
+	  src.getPixel(x, y, pixel);
+	  for (int b = 0; b < src.numBands; b++)
+	    pixel[b] = pixel[b] * lscale[b] + loff[b];
+	  dest.setPixel(x, y, pixel);
+	}
+    return dest;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)
+   */
+  public BufferedImage createCompatibleDestImage(BufferedImage src,
+						 ColorModel dstCM)
+  {
+    if (dstCM == null) dstCM = src.getColorModel();
+    WritableRaster wr = src.getRaster().createCompatibleWritableRaster();
+    BufferedImage image
+      = new BufferedImage(dstCM, wr, src.isPremultiplied, null);
+    return image;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
+   */
+  public WritableRaster createCompatibleDestRaster(Raster src)
+  {
+    return src.createCompatibleWritableRaster();
+  }
+  
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#getBounds2D(java.awt.image.BufferedImage)
+   */
+  public final Rectangle2D getBounds2D(BufferedImage src)
+  {
+    return src.getRaster().getBounds();
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster)
+   */
+  public final Rectangle2D getBounds2D(Raster src)
+  {
+    return src.getBounds();
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D)
+   */
+  public final Point2D getPoint2D(Point2D src, Point2D dst) {
+    if (dst == null) dst = (Point2D) src.clone();
+    else dst.setLocation(src);
+    return dst;
+  }
+
+}