Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/ikvm/openjdk/java/awt/image/BandCombineOp.java

@@ -0,0 +1,218 @@
+/* BandCombineOp.java - perform a combination on the bands of a raster
+   Copyright (C) 2004, 2006  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;
+
+/**
+ * Filter Raster pixels by applying a matrix.
+ * 
+ * BandCombineOp applies a matrix to each pixel to produce new pixel values.
+ * The width of the matrix must be the same or one more than the number of
+ * bands in the source Raster.  If one more, the pixels in the source are
+ * assumed to contain an implicit 1.0 at the end.
+ * 
+ * The rows of the matrix are multiplied by the pixel to produce the values
+ * for the destination.  Therefore the destination Raster must contain the
+ * same number of bands as the number of rows in the filter matrix.
+ * 
+ * This Op assumes that samples are integers; floating point sample types will
+ * be rounded to their nearest integer value during filtering.
+ * 
+ * @author Jerry Quinn (jlquinn@optonline.net)
+ */
+public class BandCombineOp implements RasterOp
+{
+  private RenderingHints hints;
+  private float[][] matrix;
+  
+  /**
+   * Construct a BandCombineOp.
+   * 
+   * @param matrix The matrix to filter pixels with.
+   * @param hints Rendering hints to apply.  Ignored.
+   * @throws ArrayIndexOutOfBoundsException if the matrix is invalid
+   */
+  public BandCombineOp(float[][] matrix, RenderingHints hints)
+  {
+    this.matrix = new float[matrix.length][];
+    int width = matrix[0].length;
+    for (int i = 0; i < matrix.length; i++)
+      {
+        this.matrix[i] = new float[width + 1];
+        for (int j = 0; j < width; j++)
+          this.matrix[i][j] = matrix[i][j];
+
+        // The reference implementation pads the array with a trailing zero...
+        this.matrix[i][width] = 0;
+      }
+
+    this.hints = hints;
+  }
+
+  /**
+   * Filter Raster pixels through a matrix. Applies the Op matrix to source
+   * pixes to produce dest pixels. Each row of the matrix is multiplied by the
+   * src pixel components to produce the dest pixel. If matrix is one more than
+   * the number of bands in the src, the last element is implicitly multiplied
+   * by 1, i.e. added to the sum for that dest component. If dest is null, a
+   * suitable Raster is created. This implementation uses
+   * createCompatibleDestRaster.
+   * 
+   * @param src The source Raster.
+   * @param dest The destination Raster, or null.
+   * @throws IllegalArgumentException if the destination raster is incompatible
+   *           with the source raster.
+   * @return The filtered Raster.
+   * @see java.awt.image.RasterOp#filter(java.awt.image.Raster,
+   *      java.awt.image.WritableRaster)
+   */
+  public WritableRaster filter(Raster src, WritableRaster dest) {
+    if (dest == null)
+      dest = createCompatibleDestRaster(src);
+    else if (dest.getNumBands() != src.getNumBands()
+             || dest.getTransferType() != src.getTransferType())
+      throw new IllegalArgumentException("Destination raster is incompatible with source raster");
+
+    // Filter the pixels
+    int[] spix = new int[matrix[0].length - 1];
+    int[] spix2 = new int[matrix[0].length - 1];
+    int[] dpix = new int[matrix.length];
+    for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
+      for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
+        {
+          // In case matrix rows have implicit translation
+          spix[spix.length - 1] = 1;
+          src.getPixel(x, y, spix);
+          
+          // Do not re-calculate if pixel is identical to the last one
+          // (ie, blocks of the same colour)
+          if (!Arrays.equals(spix, spix2))
+            {
+              System.arraycopy(spix, 0, spix2, 0, spix.length);
+              for (int i = 0; i < matrix.length; i++)
+                {
+                  dpix[i] = 0;
+                  for (int j = 0; j < matrix[0].length - 1; j++)
+                    dpix[i] += spix[j] * (int)matrix[i][j];
+                }
+            }
+          dest.setPixel(x, y, dpix);
+        }
+
+    return dest;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster)
+   */
+  public final Rectangle2D getBounds2D(Raster src)
+  {
+    return src.getBounds();
+  }
+
+  /**
+   * Creates a new WritableRaster that can be used as the destination for this
+   * Op. The number of bands in the source raster must equal the number of rows
+   * in the op matrix, which must also be equal to either the number of columns
+   * or (columns - 1) in the matrix.
+   * 
+   * @param src The source raster.
+   * @return A compatible raster.
+   * @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
+   * @throws IllegalArgumentException if the raster is incompatible with the
+   *           matrix.
+   */
+  public WritableRaster createCompatibleDestRaster(Raster src)
+  {
+    // Destination raster must have same number of bands as source
+    if (src.getNumBands() != matrix.length)
+      throw new IllegalArgumentException("Number of rows in matrix specifies an "
+                                             + "incompatible number of bands");
+
+    // We use -1 and -2 because we previously padded the rows with a trailing 0
+    if (src.getNumBands() != matrix[0].length - 1
+        && src.getNumBands() != matrix[0].length - 2)
+      throw new IllegalArgumentException("Incompatible number of bands: "
+                                             + "the number of bands in the raster must equal the number of "
+                                             + "columns in the matrix, optionally minus one");
+
+    return src.createCompatibleWritableRaster();
+  }
+
+  /**
+   * Return corresponding destination point for source point.  Because this is
+   * not a geometric operation, it simply returns a copy of the source.
+   * 
+   * @param src The source point.
+   * @param dst The destination point.
+   * @return dst The destination point.
+   * @see java.awt.image.RasterOp#getPoint2D(java.awt.geom.Point2D,
+   *java.awt.geom.Point2D) 
+   */
+  public final Point2D getPoint2D(Point2D src, Point2D dst)
+  {
+    if (dst == null)
+      return (Point2D)src.clone();
+    
+    dst.setLocation(src);
+    return dst;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#getRenderingHints()
+   */
+  public final RenderingHints getRenderingHints()
+  {
+    return hints;
+  }
+  
+  /**
+   * Return the matrix used in this operation.
+   *
+   * @return The matrix used in this operation.
+   */
+  public final float[][] getMatrix()
+  {
+    return matrix;
+  }
+
+}

external/ikvm/openjdk/java/awt/image/ConvolveOp.java

@@ -0,0 +1,380 @@
+/* ConvolveOp.java --
+   Copyright (C) 2004, 2005, 2006, Free Software Foundation -- ConvolveOp
+
+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;
+
+/**
+ * Convolution filter.
+ * 
+ * ConvolveOp convolves the source image with a Kernel to generate a
+ * destination image.  This involves multiplying each pixel and its neighbors
+ * with elements in the kernel to compute a new pixel.
+ * 
+ * Each band in a Raster is convolved and copied to the destination Raster.
+ * For BufferedImages, convolution is applied to all components.  Color 
+ * conversion will be applied if needed.
+ * 
+ * Note that this filter ignores whether the source or destination is alpha
+ * premultiplied.  The reference spec states that data will be premultiplied
+ * prior to convolving and divided back out afterwards (if needed), but testing
+ * has shown that this is not the case with their implementation.
+ * 
+ * @author jlquinn@optonline.net
+ */
+public class ConvolveOp implements BufferedImageOp, RasterOp
+{
+  /** Edge pixels are set to 0. */
+  public static final int EDGE_ZERO_FILL = 0;
+  
+  /** Edge pixels are copied from the source. */
+  public static final int EDGE_NO_OP = 1;
+  
+  private Kernel kernel;
+  private int edge;
+  private RenderingHints hints;
+
+  /**
+   * Construct a ConvolveOp.
+   * 
+   * The edge condition specifies that pixels outside the area that can be
+   * filtered are either set to 0 or copied from the source image.
+   * 
+   * @param kernel The kernel to convolve with.
+   * @param edgeCondition Either EDGE_ZERO_FILL or EDGE_NO_OP.
+   * @param hints Rendering hints for color conversion, or null.
+   */
+  public ConvolveOp(Kernel kernel,
+      				int edgeCondition,
+      				RenderingHints hints)
+  {
+    this.kernel = kernel;
+    edge = edgeCondition;
+    this.hints = hints;
+  }
+  
+  /**
+   * Construct a ConvolveOp.
+   * 
+   * The edge condition defaults to EDGE_ZERO_FILL.
+   * 
+   * @param kernel The kernel to convolve with.
+   */
+  public ConvolveOp(Kernel kernel)
+  {
+    this.kernel = kernel;
+    edge = EDGE_ZERO_FILL;
+    hints = null;
+  }
+
+  /**
+   * Converts the source image using the kernel specified in the
+   * constructor.  The resulting image is stored in the destination image if one
+   * is provided; otherwise a new BufferedImage is created and returned. 
+   * 
+   * The source and destination BufferedImage (if one is supplied) must have
+   * the same dimensions.
+   *
+   * @param src The source image.
+   * @param dst The destination image.
+   * @throws IllegalArgumentException if the rasters and/or color spaces are
+   *            incompatible.
+   * @return The convolved image.
+   */
+  public final BufferedImage filter(BufferedImage src, BufferedImage dst)
+  {
+    if (src == dst)
+      throw new IllegalArgumentException("Source and destination images " +
+            "cannot be the same.");
+    
+    if (dst == null)
+      dst = createCompatibleDestImage(src, src.getColorModel());
+    
+    // Make sure source image is premultiplied
+    BufferedImage src1 = src;
+    // The spec says we should do this, but mauve testing shows that Sun's
+    // implementation does not check this.
+    /*
+    if (!src.isAlphaPremultiplied())
+    {
+      src1 = createCompatibleDestImage(src, src.getColorModel());
+      src.copyData(src1.getRaster());
+      src1.coerceData(true);
+    }
+    */
+
+    BufferedImage dst1 = dst;
+    if (src1.getColorModel().getColorSpace().getType() != dst.getColorModel().getColorSpace().getType())
+      dst1 = createCompatibleDestImage(src, src.getColorModel());
+
+    filter(src1.getRaster(), dst1.getRaster());
+    
+    // Since we don't coerceData above, we don't need to divide it back out.
+    // This is wrong (one mauve test specifically tests converting a non-
+    // premultiplied image to a premultiplied image, and it shows that Sun
+    // simply ignores the premultipled flag, contrary to the spec), but we
+    // mimic it for compatibility.
+    /*
+	if (! dst.isAlphaPremultiplied())
+	  dst1.coerceData(false);
+    */
+
+    // Convert between color models if needed
+    if (dst1 != dst)
+      new ColorConvertOp(hints).filter(dst1, dst);
+
+    return dst;
+  }
+
+  /**
+   * Creates an empty BufferedImage with the size equal to the source and the
+   * correct number of bands. The new image is created with the specified 
+   * ColorModel, or if no ColorModel is supplied, an appropriate one is chosen.
+   *
+   * @param src The source image.
+   * @param dstCM A color model for the destination image (may be null).
+   * @return The new compatible destination image.
+   */
+  public BufferedImage createCompatibleDestImage(BufferedImage src,
+                                                 ColorModel dstCM)
+  {
+    if (dstCM != null)
+      return new BufferedImage(dstCM,
+                               src.getRaster().createCompatibleWritableRaster(),
+                               src.isAlphaPremultiplied(), null);
+
+    return new BufferedImage(src.getWidth(), src.getHeight(), src.getType());
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#getRenderingHints()
+   */
+  public final RenderingHints getRenderingHints()
+  {
+    return hints;
+  }
+  
+  /**
+   * Get the edge condition for this Op.
+   * 
+   * @return The edge condition.
+   */
+  public int getEdgeCondition()
+  {
+    return edge;
+  }
+  
+  /**
+   * Returns (a clone of) the convolution kernel.
+   *
+   * @return The convolution kernel.
+   */
+  public final Kernel getKernel()
+  {
+    return (Kernel) kernel.clone();
+  }
+
+  /**
+   * Converts the source raster using the kernel specified in the constructor.  
+   * The resulting raster is stored in the destination raster if one is 
+   * provided; otherwise a new WritableRaster is created and returned.
+   * 
+   * If the convolved value for a sample is outside the range of [0-255], it
+   * will be clipped.
+   * 
+   * The source and destination raster (if one is supplied) cannot be the same,
+   * and must also have the same dimensions.
+   *
+   * @param src The source raster.
+   * @param dest The destination raster.
+   * @throws IllegalArgumentException if the rasters identical.
+   * @throws ImagingOpException if the convolution is not possible.
+   * @return The transformed raster.
+   */
+  public final WritableRaster filter(Raster src, WritableRaster dest)
+  {
+    if (src == dest)
+      throw new IllegalArgumentException("src == dest is not allowed.");
+    if (kernel.getWidth() > src.getWidth() 
+        || kernel.getHeight() > src.getHeight())
+      throw new ImagingOpException("The kernel is too large.");
+    if (dest == null)
+      dest = createCompatibleDestRaster(src);
+    else if (src.getNumBands() != dest.getNumBands())
+      throw new ImagingOpException("src and dest have different band counts.");
+
+    // calculate the borders that the op can't reach...
+    int kWidth = kernel.getWidth();
+    int kHeight = kernel.getHeight();
+    int left = kernel.getXOrigin();
+    int right = Math.max(kWidth - left - 1, 0);
+    int top = kernel.getYOrigin();
+    int bottom = Math.max(kHeight - top - 1, 0);
+    
+    // Calculate max sample values for clipping
+    int[] maxValue = src.getSampleModel().getSampleSize();
+    for (int i = 0; i < maxValue.length; i++)
+      maxValue[i] = (int)Math.pow(2, maxValue[i]) - 1;
+    
+    // process the region that is reachable...
+    int regionW = src.width - left - right;
+    int regionH = src.height - top - bottom;
+    float[] kvals = kernel.getKernelData(null);
+    float[] tmp = new float[kWidth * kHeight];
+
+    for (int x = 0; x < regionW; x++)
+      {
+        for (int y = 0; y < regionH; y++)
+          {
+            // FIXME: This needs a much more efficient implementation
+            for (int b = 0; b < src.getNumBands(); b++)
+            {
+              float v = 0;
+              src.getSamples(x, y, kWidth, kHeight, b, tmp);
+              for (int i = 0; i < tmp.length; i++)
+                v += tmp[tmp.length - i - 1] * kvals[i];
+                // FIXME: in the above line, I've had to reverse the order of 
+                // the samples array to make the tests pass.  I haven't worked 
+                // out why this is necessary.
+
+              // This clipping is is undocumented, but determined by testing.
+              if (v > maxValue[b])
+                v = maxValue[b];
+              else if (v < 0)
+                v = 0;
+
+              dest.setSample(x + kernel.getXOrigin(), y + kernel.getYOrigin(), 
+                             b, v);
+            }
+          }
+      }
+    
+    // fill in the top border
+    fillEdge(src, dest, 0, 0, src.width, top, edge);
+    
+    // fill in the bottom border
+    fillEdge(src, dest, 0, src.height - bottom, src.width, bottom, edge);
+    
+    // fill in the left border
+    fillEdge(src, dest, 0, top, left, regionH, edge);
+    
+    // fill in the right border
+    fillEdge(src, dest, src.width - right, top, right, regionH, edge);
+    
+    return dest;  
+  }
+  
+  /**
+   * Fills a range of pixels (typically at the edge of a raster) with either
+   * zero values (if <code>edgeOp</code> is <code>EDGE_ZERO_FILL</code>) or the 
+   * corresponding pixel values from the source raster (if <code>edgeOp</code>
+   * is <code>EDGE_NO_OP</code>).  This utility method is called by the 
+   * {@link #fillEdge(Raster, WritableRaster, int, int, int, int, int)} method.
+   * 
+   * @param src  the source raster.
+   * @param dest  the destination raster.
+   * @param x  the x-coordinate of the top left pixel in the range.
+   * @param y  the y-coordinate of the top left pixel in the range.
+   * @param w  the width of the pixel range.
+   * @param h  the height of the pixel range.
+   * @param edgeOp  indicates how to determine the values for the range
+   *     (either {@link #EDGE_ZERO_FILL} or {@link #EDGE_NO_OP}).
+   */
+  private void fillEdge(Raster src, WritableRaster dest, int x, int y, int w, 
+                        int h, int edgeOp) 
+  {
+    if (w <= 0)
+      return;
+    if (h <= 0)
+      return;
+    if (edgeOp == EDGE_ZERO_FILL)  // fill region with zeroes
+      {
+        float[] zeros = new float[src.getNumBands() * w * h];
+        dest.setPixels(x, y, w, h, zeros); 
+      }
+    else  // copy pixels from source
+      {
+        float[] pixels = new float[src.getNumBands() * w * h];
+        src.getPixels(x, y, w, h, pixels);
+        dest.setPixels(x, y, w, h, pixels);
+      }
+  }
+
+  /* (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();
+  }
+
+  /**
+   * Returns the corresponding destination point for a source point. Because
+   * this is not a geometric operation, the destination and source points will
+   * be identical.
+   * 
+   * @param src The source point.
+   * @param dst The transformed destination point.
+   * @return The transformed destination point.
+   */
+  public final Point2D getPoint2D(Point2D src, Point2D dst)
+  {
+    if (dst == null) return (Point2D)src.clone();
+    dst.setLocation(src);
+    return dst;
+  }
+}

external/ikvm/openjdk/java/awt/image/LookupOp.java

@@ -0,0 +1,307 @@
+/* LookupOp.java -- Filter that converts each pixel using a lookup table.
+   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;
+
+/**
+ * LookupOp is a filter that converts each pixel using a lookup table.
+ * 
+ * For filtering Rasters, the lookup table must have either one component
+ * that is applied to all bands, or one component for every band in the
+ * Rasters.
+ * 
+ * For BufferedImages, the lookup table may apply to both color and alpha
+ * components.  If the lookup table contains one component, or if there are
+ * the same number of components as color components in the source, the table
+ * applies to all color components.  Otherwise the table applies to all
+ * components including alpha.  Alpha premultiplication is ignored during the
+ * lookup filtering.
+ * 
+ * After filtering, if color conversion is necessary, the conversion happens,
+ * taking alpha premultiplication into account.
+ * 
+ * @author jlquinn
+ */
+public class LookupOp implements BufferedImageOp, RasterOp
+{
+  private LookupTable lut;
+  private RenderingHints hints;
+  
+  /**
+   * Construct a new LookupOp using the given LookupTable.
+   * 
+   * @param lookup LookupTable to use.
+   * @param hints Rendering hints (can be null).
+   */
+  public LookupOp(LookupTable lookup, RenderingHints hints)
+  {
+    lut = lookup;
+    this.hints = hints;
+  }
+  
+  /**
+   * Converts the source image using the lookup table specified in the
+   * constructor.  The resulting image is stored in the destination image if one
+   * is provided; otherwise a new BufferedImage is created and returned. 
+   * 
+   * The source image cannot use an IndexColorModel, and the destination image
+   * (if one is provided) must have the same size.
+   *
+   * @param src The source image.
+   * @param dst The destination image.
+   * @throws IllegalArgumentException if the rasters and/or color spaces are
+   *            incompatible.
+   * @throws ArrayIndexOutOfBoundsException if a pixel in the source is not
+   *    contained in the LookupTable.
+   * @return The convolved image.
+   */
+  public final BufferedImage filter(BufferedImage src, BufferedImage dst)
+  {
+    if (src.getColorModel() instanceof IndexColorModel)
+      throw new IllegalArgumentException("LookupOp.filter: IndexColorModel "
+					 + "not allowed");
+    
+    if (lut.getNumComponents() != 1
+         && lut.getNumComponents() != src.getColorModel().getNumComponents()
+         && lut.getNumComponents() != src.getColorModel().getNumColorComponents())
+     throw new IllegalArgumentException("LookupOp.filter: Incompatible " +
+                "lookup table and source image");
+    
+    if (dst == null)
+      dst = createCompatibleDestImage(src, null);
+    
+    else if (src.getHeight() != dst.getHeight() || src.getWidth() != dst.getWidth())
+      throw new IllegalArgumentException("Source and destination images are " +
+                "different sizes.");
+
+    // Set up for potential colormodel mismatch
+    BufferedImage tgt;
+    if (dst.getColorModel().equals(src.getColorModel()))
+      tgt = dst;
+    else
+      tgt = createCompatibleDestImage(src, src.getColorModel());
+
+    Raster sr = src.getRaster();
+    WritableRaster dr = tgt.getRaster();
+
+    if (src.getColorModel().hasAlpha() &&
+        (lut.getNumComponents() == 1 ||
+         lut.getNumComponents() == src.getColorModel().getNumColorComponents()))
+    {
+      // Need to ignore alpha for lookup
+      int[] dbuf = new int[src.getColorModel().getNumComponents()];
+      int tmpBands = src.getColorModel().getNumColorComponents();
+      int[] tmp = new int[tmpBands];
+        
+      // Filter the pixels
+      for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
+        for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
+        {	
+          // Filter only color components, but also copy alpha
+          sr.getPixel(x, y, dbuf);
+          System.arraycopy(dbuf, 0, tmp, 0, tmpBands);
+          dr.setPixel(x, y, lut.lookupPixel(tmp, dbuf));
+          
+          /* The reference implementation does not use LookupTable.lookupPixel,
+           * but rather it seems to copy the table into a native array.  The
+           * effect of this (a probable bug in their implementation) is that
+           * an out-of-bounds lookup on a ByteLookupTable will *not* throw an
+           * out of bounds exception, but will instead return random garbage.
+           * A bad lookup on a ShortLookupTable, however, will throw an
+           * exception.
+           * 
+           * Instead of mimicing this behaviour, we always throw an
+           * ArrayOutofBoundsException by virtue of using
+           * LookupTable.lookupPixle.
+           */
+        }
+    }
+    else
+    {
+      // No alpha to ignore
+      int[] dbuf = new int[src.getColorModel().getNumComponents()];
+          
+      // Filter the pixels
+      for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
+        for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
+          dr.setPixel(x, y, lut.lookupPixel(sr.getPixel(x, y, dbuf), dbuf));
+    }
+    
+    if (tgt != dst)
+      new ColorConvertOp(hints).filter(tgt, dst);
+    
+    return dst;
+  }
+
+  /* (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.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)
+   */
+  public BufferedImage createCompatibleDestImage(BufferedImage src,
+						 ColorModel dstCM)
+  {
+    if (dstCM != null)
+      return new BufferedImage(dstCM,
+                               src.getRaster().createCompatibleWritableRaster(),
+                               src.isAlphaPremultiplied(), null);
+    
+    // This is a strange exception, done for compatibility with the reference
+    // (as demonstrated by a mauve testcase)
+    int imgType = src.getType();
+    if (imgType == BufferedImage.TYPE_USHORT_GRAY)
+      imgType = BufferedImage.TYPE_BYTE_GRAY;
+
+    return new BufferedImage(src.getWidth(), src.getHeight(), imgType);
+  }
+
+  /**
+   * Returns the corresponding destination point for a given source point.
+   * 
+   * This Op will return the source point unchanged.
+   * 
+   * @param src The source point.
+   * @param dst The destination point.
+   */
+  public final Point2D getPoint2D(Point2D src, Point2D dst)
+  {
+    if (dst == null)
+      return (Point2D) src.clone();
+
+    dst.setLocation(src);
+    return dst;
+  }
+
+  /**
+   * Return the LookupTable for this op.
+   * 
+   *  @return The lookup table.
+   */
+  public final LookupTable getTable()
+  {
+    return lut;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.RasterOp#getRenderingHints()
+   */
+  public final RenderingHints getRenderingHints()
+  {
+    return hints;
+  }
+
+  /**
+   * Filter a raster through a lookup table.
+   * 
+   * Applies the lookup table for this Rasterop to each pixel of src and
+   * puts the results in dest.  If dest is null, a new Raster is created and
+   * returned.
+   * 
+   * @param src The source raster.
+   * @param dest The destination raster.
+   * @return The WritableRaster with the filtered pixels.
+   * @throws IllegalArgumentException if lookup table has more than one
+   *    component but not the same as src and dest.
+   * @throws ArrayIndexOutOfBoundsException if a pixel in the source is not
+   *    contained in the LookupTable.
+   */
+  public final WritableRaster filter(Raster src, WritableRaster dest)
+  {
+    if (dest == null) 
+      // Allocate a raster if needed
+      dest = createCompatibleDestRaster(src);
+    else
+      if (src.getNumBands() != dest.getNumBands())
+        throw new IllegalArgumentException("Source and destination rasters " +
+                "are incompatible.");
+
+    if (lut.getNumComponents() != 1 
+        && lut.getNumComponents() != src.getNumBands())
+      throw new IllegalArgumentException("Lookup table is incompatible with " +
+            "this raster.");
+   
+    // Allocate pixel storage. 
+    int[] tmp = new int[src.getNumBands()];
+    
+    // Filter the pixels
+    for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
+      for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
+        dest.setPixel(x, y, lut.lookupPixel(src.getPixel(x, y, tmp), tmp));
+    
+    /* The reference implementation does not use LookupTable.lookupPixel,
+     * but rather it seems to copy the table into a native array.  The
+     * effect of this (a probable bug in their implementation) is that
+     * an out-of-bounds lookup on a ByteLookupTable will *not* throw an
+     * out of bounds exception, but will instead return random garbage.
+     * A bad lookup on a ShortLookupTable, however, will throw an
+     * exception.
+     * 
+     * Instead of mimicing this behaviour, we always throw an
+     * ArrayOutofBoundsException by virtue of using
+     * LookupTable.lookupPixle.
+     */
+    return dest;
+  }
+
+  /* (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.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
+   */
+  public WritableRaster createCompatibleDestRaster(Raster src)
+  {
+    return src.createCompatibleWritableRaster();
+  }
+
+}

external/ikvm/openjdk/java/awt/image/RescaleOp.java

@@ -0,0 +1,385 @@
+/* Copyright (C) 2004, 2006  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;
+
+/**
+ * RescaleOp is a filter that changes each pixel by a scaling factor and offset.
+ * 
+ * For filtering Rasters, either one scaling factor and offset can be specified,
+ * which will be applied to all bands; or a scaling factor and offset can be
+ * specified for each band.
+ * 
+ * For BufferedImages, the scaling may apply to both color and alpha components.
+ * If only one scaling factor is provided, or if the number of factors provided
+ * equals the number of color components, the scaling is performed on all color
+ * components.  Otherwise, the scaling is performed on all components including
+ * alpha.  Alpha premultiplication is ignored.
+ * 
+ * After filtering, if color conversion is necessary, the conversion happens,
+ * taking alpha premultiplication into account.
+ * 
+ * @author Jerry Quinn (jlquinn@optonline.net)
+ * @author Francis Kung (fkung@redhat.com)
+ */
+public class RescaleOp implements BufferedImageOp, RasterOp
+{
+  private float[] scale;
+  private float[] offsets;
+  private RenderingHints hints = null;
+  
+  /**
+   * Create a new RescaleOp object using the given scale factors and offsets.
+   * 
+   * The length of the arrays must be equal to the number of bands (or number of
+   * data or color components) of the raster/image that this Op will be used on,
+   * otherwise an IllegalArgumentException will be thrown when calling the
+   * filter method.
+   *  
+   * @param scaleFactors an array of scale factors.
+   * @param offsets an array of offsets.
+   * @param hints any rendering hints to use (can be null).
+   * @throws NullPointerException if the scaleFactors or offsets array is null.
+   */
+  public RescaleOp(float[] scaleFactors,
+		   float[] offsets,
+		   RenderingHints hints)
+  {
+    int length = Math.min(scaleFactors.length, offsets.length);
+    
+    scale = new float[length];
+    System.arraycopy(scaleFactors, 0, this.scale, 0, length);
+    
+    this.offsets = new float[length];
+    System.arraycopy(offsets, 0, this.offsets, 0, length);
+    
+    this.hints = hints;
+  }
+  
+  /**
+   * Create a new RescaleOp object using the given scale factor and offset.
+   * 
+   * The same scale factor and offset will be used on all bands/components.
+   *  
+   * @param scaleFactor the scale factor to use.
+   * @param offset the offset to use.
+   * @param hints any rendering hints to use (can be null).
+   */
+  public RescaleOp(float scaleFactor,
+		   float offset,
+		   RenderingHints hints)
+  {
+    scale = new float[]{ scaleFactor };
+    offsets = new float[]{offset};
+    this.hints = hints;
+  }
+
+  /**
+   * Returns the scaling factors.  This method accepts an optional array, which
+   * will be used to store the factors if not null (this avoids allocating a 
+   * new array).  If this array is too small to hold all the scaling factors,
+   * the array will be filled and the remaining factors discarded.
+   * 
+   * @param scaleFactors array to store the scaling factors in (can be null).
+   * @return an array of scaling factors.
+   */
+  public final float[] getScaleFactors(float[] scaleFactors)
+  {
+    if (scaleFactors == null)
+      scaleFactors = new float[scale.length];
+    System.arraycopy(scale, 0, scaleFactors, 0, Math.min(scale.length,
+                                                         scaleFactors.length));
+    return scaleFactors;
+  }
+
+  /**
+   * Returns the offsets.  This method accepts an optional array, which
+   * will be used to store the offsets if not null (this avoids allocating a 
+   * new array).  If this array is too small to hold all the offsets, the array 
+   * will be filled and the remaining factors discarded.
+   * 
+   * @param offsets array to store the offsets in (can be null).
+   * @return an array of offsets.
+   */
+  public final float[] getOffsets(float[] offsets)
+  {
+    if (offsets == null)
+      offsets = new float[this.offsets.length];
+    System.arraycopy(this.offsets, 0, offsets, 0, Math.min(this.offsets.length,
+                                                           offsets.length));
+    return offsets;
+  }
+
+  /**
+   * Returns the number of scaling factors / offsets.
+   * 
+   * @return the number of scaling factors / offsets.
+   */
+  public final int getNumFactors()
+  {
+    return scale.length;
+  }
+
+  /* (non-Javadoc)
+   * @see java.awt.image.BufferedImageOp#getRenderingHints()
+   */
+  public final RenderingHints getRenderingHints()
+  {
+    return hints;
+  }
+
+  /**
+   * Converts the source image using the scale factors and offsets specified in 
+   * the constructor.  The resulting image is stored in the destination image if 
+   * one is provided; otherwise a new BufferedImage is created and returned. 
+   * 
+   * The source image cannot use an IndexColorModel, and the destination image
+   * (if one is provided) must have the same size.
+   * 
+   * If the final value of a sample is beyond the range of the color model, it
+   * will be clipped to the appropriate maximum / minimum.
+   *
+   * @param src The source image.
+   * @param dst The destination image.
+   * @throws IllegalArgumentException if the rasters and/or color spaces are
+   *            incompatible.
+   * @return The rescaled image.
+   */
+  public final BufferedImage filter(BufferedImage src, BufferedImage dst)
+  {
+    // Initial checks
+    if (scale.length != 1
+        && scale.length != src.getColorModel().getNumComponents()
+        && (scale.length != src.getColorModel().getNumColorComponents()))
+      throw new IllegalArgumentException("Source image has wrong number of "
+                                         + "bands for these scaling factors.");
+
+    if (dst == null)
+      dst = createCompatibleDestImage(src, null);
+    else if (src.getHeight() != dst.getHeight()
+             || src.getWidth() != dst.getWidth())
+      throw new IllegalArgumentException("Source and destination images are "
+                                         + "different sizes.");
+
+    // Prepare for possible colorspace conversion
+    BufferedImage dst2 = dst;
+    if (dst.getColorModel().getColorSpace().getType() != src.getColorModel().getColorSpace().getType())
+      dst2 = createCompatibleDestImage(src, src.getColorModel());
+
+    // Figure out how many bands to scale
+    int numBands = scale.length;
+    if (scale.length == 1)
+      numBands = src.getColorModel().getNumColorComponents();
+    boolean[] bands = new boolean[numBands];
+    // this assumes the alpha, if present, is the last band
+    Arrays.fill(bands, true);
+
+    // Perform rescaling
+    filter(src.getRaster(), dst2.getRaster(), bands);
+
+    // Copy alpha band if needed (ie if it exists and wasn't scaled)
+    // NOTE: This assumes the alpha component is the last band!
+    if (src.getColorModel().hasAlpha()
+        && numBands == src.getColorModel().getNumColorComponents())
+      {
+
+        dst2.getRaster().setSamples(0, 0, src.getWidth(), src.getHeight(),
+                                    numBands,
+                                    src.getRaster().getSamples(0, 0,
+                                                               src.getWidth(),
+                                                               src.getHeight(),
+                                                               numBands,
+                                                               (int[]) null));
+      }
+
+    // Perform colorspace conversion if needed
+    if (dst != dst2)
+      new ColorConvertOp(hints).filter(dst2, dst);
+
+    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)
+  {
+    // Required sanity checks
+    if (scale.length != 1 && scale.length != src.numBands)
+      throw new IllegalArgumentException("Number of rasters is incompatible "
+                                             + "with the number of scaling "
+                                             + "factors provided.");
+
+    if (dest == null)
+      dest = src.createCompatibleWritableRaster();
+    else if (src.getHeight() != dest.getHeight()
+             || src.getWidth() != dest.getWidth())
+      throw new IllegalArgumentException("Source and destination rasters are "
+                                         + "different sizes.");
+    else if (src.numBands != dest.numBands)
+      throw new IllegalArgumentException("Source and destination rasters "
+                                         + "are incompatible.");
+
+    // Filter all bands
+    boolean[] bands = new boolean[src.getNumBands()];
+    Arrays.fill(bands, true);
+    return filter(src, dest, bands);
+  }
+  
+  /**
+   * Perform raster-based filtering on a selected number of bands.
+   * 
+   * The length of the bands array should equal the number of bands; a true
+   * element indicates filtering should happen on the corresponding band, while
+   * a false element will skip the band.
+   * 
+   * The rasters are assumed to be compatible and non-null.
+   * 
+   * @param src the source raster.
+   * @param dest the destination raster.
+   * @param bands an array indicating which bands to filter.
+   * @throws NullPointerException if any parameter is null.
+   * @throws ArrayIndexOutOfBoundsException if the bands array is too small.
+   * @return the destination raster.
+   */
+  private WritableRaster filter(Raster src, WritableRaster dest, boolean[] bands)
+  {
+    int[] values = new int[src.getHeight() * src.getWidth()];
+    float scaleFactor, offset;
+    
+    // Find max sample value, to be used for clipping later
+    int[] maxValue = src.getSampleModel().getSampleSize();
+    for (int i = 0; i < maxValue.length; i++)
+      maxValue[i] = (int)Math.pow(2, maxValue[i]) - 1;
+    
+    // TODO: can this be optimized further?
+    // Filter all samples of all requested bands
+    for (int band = 0; band < bands.length; band++)
+      if (bands[band])
+        {
+          values = src.getSamples(src.getMinX(), src.getMinY(), src.getWidth(),
+                                  src.getHeight(), band, values);
+
+          if (scale.length == 1)
+            {
+              scaleFactor = scale[0];
+              offset = offsets[0];
+            }
+          else
+            {
+              scaleFactor = scale[band];
+              offset = offsets[band];
+            }
+
+          for (int i = 0; i < values.length; i++)
+            {
+              values[i] = (int) (values[i] * scaleFactor + offset);
+
+              // Clip if needed
+              if (values[i] < 0)
+                values[i] = 0;
+              if (values[i] > maxValue[band])
+                values[i] = maxValue[band];
+            }
+
+          dest.setSamples(dest.getMinX(), dest.getMinY(), dest.getWidth(),
+                          dest.getHeight(), band, values);
+        }
+    
+    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)
+      return new BufferedImage(src.getWidth(), src.getHeight(), src.getType());
+    
+    return new BufferedImage(dstCM,
+                             src.getRaster().createCompatibleWritableRaster(),
+                             src.isAlphaPremultiplied(), null);
+  }
+
+  /* (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;
+  }
+
+}