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1 files changed, 408 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/ComponentColorModel.java b/libjava/classpath/java/awt/image/ComponentColorModel.java
new file mode 100644
index 000000000..ef0b84f00
--- /dev/null
+++ b/libjava/classpath/java/awt/image/ComponentColorModel.java
@@ -0,0 +1,408 @@
+/* ComponentColorModel.java --
+   Copyright (C) 2000, 2002, 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 gnu.java.awt.Buffers;
+
+import java.awt.Point;
+import java.awt.color.ColorSpace;
+import java.util.Arrays;
+
+public class ComponentColorModel extends ColorModel
+{
+  // Find sum of all elements of the array.
+  private static int sum(int[] values)
+  {
+    int sum = 0;
+    for (int i=0; i<values.length; i++)
+      sum += values[i];
+    return sum;
+  }
+
+  // Create an appropriate array of bits, given a colorspace (ie, number of
+  // bands), size of the storage data type, and presence of an alpha band.
+  private static int[] findBits(ColorSpace colorSpace, int transferType,
+                                boolean hasAlpha)
+  {
+    int[] bits;
+    if (hasAlpha)
+      bits = new int[colorSpace.getNumComponents()+1];
+    else
+      bits = new int[colorSpace.getNumComponents()];
+
+    Arrays.fill(bits, DataBuffer.getDataTypeSize(transferType));
+
+    return bits;
+  }
+
+  public ComponentColorModel(ColorSpace colorSpace, int[] bits,
+                             boolean hasAlpha,
+                             boolean isAlphaPremultiplied,
+                             int transparency, int transferType)
+  {
+    super(sum(bits), bits, colorSpace, hasAlpha, isAlphaPremultiplied,
+          transparency, transferType);
+  }
+
+  /**
+   * Construct a new ComponentColorModel.
+   *
+   * This constructor makes all bits of each sample significant, so for a
+   * transferType of DataBuffer.BYTE, the bits per sample is 8, etc.  If
+   * both hasAlpha and isAlphaPremultiplied are true, color samples are
+   * assumed to be premultiplied by the alpha component.  Transparency may be
+   * one of OPAQUE, BITMASK, or TRANSLUCENT.
+   *
+   * @param colorSpace The colorspace for this color model.
+   * @param hasAlpha True if there is an alpha component.
+   * @param isAlphaPremultiplied True if colors are already multiplied by
+   * alpha.
+   * @param transparency The type of alpha values.
+   * @param transferType Data type of pixel sample values.
+   * @since 1.4
+   */
+  public ComponentColorModel(ColorSpace colorSpace,
+                             boolean hasAlpha,
+                             boolean isAlphaPremultiplied,
+                             int transparency, int transferType)
+  {
+    this(colorSpace, findBits(colorSpace, transferType, hasAlpha), hasAlpha,
+         isAlphaPremultiplied, transparency, transferType);
+  }
+
+  public int getRed(int pixel)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    return (int) getRGBFloat(pixel)[0];
+  }
+
+  public int getGreen(int pixel)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    return (int) getRGBFloat(pixel)[0];
+  }
+
+  public int getBlue(int pixel)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    return (int) getRGBFloat(pixel)[0];
+  }
+
+  public int getAlpha(int pixel)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    int shift = 8 - getComponentSize(getNumColorComponents());
+    if (shift >= 0) return pixel << shift;
+    return pixel >> (-shift);
+  }
+
+  public int getRGB(int pixel)
+  {
+    float[] rgb = getRGBFloat(pixel);
+    int ret = getRGB(rgb);
+    if (hasAlpha()) ret |= getAlpha(pixel) << 24;
+    return ret;
+  }
+
+
+  /* Note, it's OK to pass a to large array to toRGB(). Extra
+     elements are ignored. */
+
+  private float[] getRGBFloat(int pixel)
+  {
+    float[] data = { pixel };
+    return cspace.toRGB(data);
+  }
+
+  private float[] getRGBFloat(Object inData)
+  {
+    DataBuffer buffer =
+    Buffers.createBufferFromData(transferType, inData,
+                                 getNumComponents());
+    int colors = getNumColorComponents();
+    float[] data = new float[colors];
+
+    // FIXME: unpremultiply data that is premultiplied
+    for (int i=0; i<colors; i++)
+      {
+        float maxValue = (1<<getComponentSize(i))-1;
+        data[i] = buffer.getElemFloat(i)/maxValue;
+      }
+    float[] rgb = cspace.toRGB(data);
+    return rgb;
+  }
+
+  public int getRed(Object inData)
+  {
+    return (int) getRGBFloat(inData)[0]*255;
+  }
+
+  public int getGreen(Object inData)
+  {
+    return (int) getRGBFloat(inData)[1]*255;
+  }
+
+  public int getBlue(Object inData)
+  {
+    return (int) getRGBFloat(inData)[2]*255;
+  }
+
+  public int getAlpha(Object inData)
+  {
+    DataBuffer buffer =
+      Buffers.createBufferFromData(transferType, inData,
+                                   getNumComponents());
+    int shift = 8 - getComponentSize(getNumColorComponents());
+    int alpha = buffer.getElem(getNumColorComponents());
+    if (shift >= 0) return alpha << shift;
+    return alpha >> (-shift);
+  }
+
+  private int getRGB(float[] rgb)
+  {
+    /* NOTE: We could cast to byte instead of int here. This would
+       avoid bits spilling over from one bit field to
+       another. But, if we assume that floats are in the [0.0,
+       1.0] range, this will never happen anyway. */
+
+    /* Remember to multiply BEFORE casting to int, otherwise, decimal
+       point data will be lost. */
+    int ret =
+      (((int) (rgb[0]*255F)) << 16) |
+      (((int) (rgb[1]*255F)) <<  8) |
+      (((int) (rgb[2]*255F)) <<  0);
+    return ret;
+  }
+
+  /**
+   * @param inData pixel data of transferType, as returned by the
+   * getDataElements method in SampleModel.
+   */
+  public int getRGB(Object inData)
+  {
+    float[] rgb = getRGBFloat(inData);
+    int ret = getRGB(rgb);
+    if (hasAlpha()) ret |= getAlpha(inData) << 24;
+    return ret;
+  }
+
+  public Object getDataElements(int rgb, Object pixel)
+  {
+    // Convert rgb to [0.0, 1.0] sRGB values.
+    float[] rgbFloats = {
+      ((rgb >> 16)&0xff)/255.0F,
+      ((rgb >>  8)&0xff)/255.0F,
+      ((rgb >>  0)&0xff)/255.0F
+    };
+
+    // Convert from rgb to color space components.
+    float[] data = cspace.fromRGB(rgbFloats);
+    DataBuffer buffer = Buffers.createBuffer(transferType, pixel,
+                                             getNumComponents());
+    int numColors = getNumColorComponents();
+
+    if (hasAlpha())
+      {
+        float alpha = ((rgb >> 24)&0xff)/255.0F;
+
+        /* If color model has alpha and should be premultiplied, multiply
+           color space components with alpha value. */
+        if (isAlphaPremultiplied()) {
+          for (int i=0; i<numColors; i++)
+            data[i] *= alpha;
+        }
+        // Scale the alpha sample to the correct number of bits.
+        alpha *= (1<<(bits[numColors]-1));
+        // Arrange the alpha sample in the output array.
+        buffer.setElemFloat(numColors, alpha);
+      }
+    for (int i=0; i<numColors; i++)
+      {
+        // Scale the color samples to the correct number of bits.
+        float value = data[i]*(1<<(bits[i]-1));
+        // Arrange the color samples in the output array.
+        buffer.setElemFloat(i, value);
+      }
+    return Buffers.getData(buffer);
+  }
+
+  public int[] getComponents(int pixel, int[] components, int offset)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    if (components == null)
+    components = new int[getNumComponents() + offset];
+    components[offset] = pixel;
+    return components;
+  }
+
+  public int[] getComponents(Object pixel, int[] components, int offset)
+  {
+    DataBuffer buffer = Buffers.createBuffer(transferType, pixel,
+                                             getNumComponents());
+    int numComponents = getNumComponents();
+
+    if (components == null)
+      components = new int[numComponents + offset];
+
+    for (int i=0; i<numComponents; i++)
+      components[offset++] = buffer.getElem(i);
+
+    return components;
+  }
+
+  public int getDataElement(int[] components, int offset)
+  {
+    if (getNumComponents()>1) throw new IllegalArgumentException();
+    return components[offset];
+  }
+
+  public Object getDataElements(int[] components, int offset, Object obj)
+  {
+    DataBuffer buffer = Buffers.createBuffer(transferType, obj,
+                                             getNumComponents());
+    int numComponents = getNumComponents();
+
+    for (int i=0; i<numComponents; i++)
+      buffer.setElem(i, components[offset++]);
+
+    return Buffers.getData(buffer);
+  }
+
+  public ColorModel coerceData(WritableRaster raster,
+                               boolean isAlphaPremultiplied) {
+    if (this.isAlphaPremultiplied == isAlphaPremultiplied || !hasAlpha())
+      return this;
+
+    /* TODO: provide better implementation based on the
+       assumptions we can make due to the specific type of the
+       color model. */
+    coerceDataWorker(raster, isAlphaPremultiplied);
+
+    return new ComponentColorModel(cspace, hasAlpha, isAlphaPremultiplied,
+                                   transparency, transferType);
+  }
+
+  public boolean isCompatibleRaster(Raster raster)
+  {
+    return super.isCompatibleRaster(raster);
+    // FIXME: Should we test something more here? (Why override?)
+  }
+
+  public WritableRaster createCompatibleWritableRaster(int w, int h)
+  {
+    SampleModel sm = createCompatibleSampleModel(w, h);
+    Point origin = new Point(0, 0);
+    return Raster.createWritableRaster(sm, origin);
+  }
+
+
+  /**
+   * Creates a <code>SampleModel</code> whose arrangement of pixel
+   * data is compatible to this <code>ColorModel</code>.
+   *
+   * @param w the number of pixels in the horizontal direction.
+   * @param h the number of pixels in the vertical direction.
+   */
+  public SampleModel createCompatibleSampleModel(int w, int h)
+  {
+    int pixelStride, scanlineStride;
+    int[] bandOffsets;
+
+    pixelStride = getNumComponents();
+    scanlineStride = pixelStride * w;
+
+    /* We might be able to re-use the same bandOffsets array among
+     * multiple calls to this method. However, this optimization does
+     * not seem worthwile because setting up descriptive data
+     * structures (such as SampleModels) is neglectible in comparision
+     * to shuffling around masses of pixel data.
+     */
+    bandOffsets = new int[pixelStride];
+    for (int i = 0; i < pixelStride; i++)
+      bandOffsets[i] = i;
+
+    /* FIXME: Think about whether it would make sense to return the
+     * possibly more efficient PixelInterleavedSampleModel for other
+     * transferTypes as well. It seems unlikely that this would break
+     * any user applications, so the Mauve tests on this method
+     * might be too restrictive.
+     */
+    switch (transferType)
+      {
+      case DataBuffer.TYPE_BYTE:
+      case DataBuffer.TYPE_USHORT:
+        return new PixelInterleavedSampleModel(transferType, w, h,
+                                               pixelStride,
+                                               scanlineStride,
+                                               bandOffsets);
+
+      default:
+        return new ComponentSampleModel(transferType, w, h,
+                                        pixelStride,
+                                        scanlineStride,
+                                        bandOffsets);
+      }
+  }
+
+
+  public boolean isCompatibleSampleModel(SampleModel sm)
+  {
+    return
+      (sm instanceof ComponentSampleModel) &&
+      super.isCompatibleSampleModel(sm);
+  }
+
+  public WritableRaster getAlphaRaster(WritableRaster raster)
+  {
+    if (!hasAlpha()) return null;
+
+    SampleModel sm = raster.getSampleModel();
+    int[] alphaBand = { sm.getNumBands() - 1 };
+    SampleModel alphaModel = sm.createSubsetSampleModel(alphaBand);
+    DataBuffer buffer = raster.getDataBuffer();
+    Point origin = new Point(0, 0);
+    return Raster.createWritableRaster(alphaModel, buffer, origin);
+  }
+
+  public boolean equals(Object obj)
+  {
+    if (!(obj instanceof ComponentColorModel)) return false;
+    return super.equals(obj);
+  }
+}