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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [java/] [awt/] [java2d/] [AlphaCompositeContext.java] - Blame information for rev 769

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1 769 jeremybenn
/* AlphaCompositeContext.java -- CompositeContext impl for AlphaComposite
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   Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.awt.java2d;
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import java.awt.AWTError;
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import java.awt.AlphaComposite;
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import java.awt.CompositeContext;
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import java.awt.image.ColorModel;
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import java.awt.image.Raster;
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import java.awt.image.WritableRaster;
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/**
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 * A CompositeContext implementation for {@link AlphaComposite}.
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 *
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 * @author Roman Kennke (kennke@aicas.com)
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 */
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public class AlphaCompositeContext
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  implements CompositeContext
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{
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  /**
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   * The Composite object for which we perform compositing.
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   */
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  private AlphaComposite composite;
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  /**
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   * The source color model.
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   */
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  private ColorModel srcColorModel;
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  /**
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   * The destination color model.
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   */
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  private ColorModel dstColorModel;
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  /**
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   * The blending factor for the source.
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   */
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  private float fs;
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  /**
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   * The blending factor for the destination.
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   */
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  private float fd;
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  /**
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   * Creates a new AlphaCompositeContext.
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   *
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   * @param aComp the AlphaComposite object
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   * @param srcCM the source color model
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   * @param dstCM the destination color model
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   */
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  public AlphaCompositeContext(AlphaComposite aComp, ColorModel srcCM,
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                               ColorModel dstCM)
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  {
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    composite = aComp;
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    srcColorModel = srcCM;
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    dstColorModel = dstCM;
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    // Determine the blending factors according to the rule in the
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    // AlphaComposite. For some rules the factors must be determined
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    // dynamically because they depend on the actual pixel value.
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    switch (composite.getRule())
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    {
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      case AlphaComposite.CLEAR:
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        fs = 0.F;
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        fd= 0.F;
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        break;
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      case AlphaComposite.DST:
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        fs = 0.F;
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        fd= 1.F;
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        break;
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      case AlphaComposite.DST_ATOP:
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        fs = 1.F; // Determined later as 1 - alpha_dst;
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        fd = 1.F; // Determined later as alpha_src;
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        break;
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      case AlphaComposite.DST_IN:
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        fs = 0.F;
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        fd = 0.F; // Determined later as alpha_src;
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        break;
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      case AlphaComposite.DST_OUT:
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        fs = 0.F;
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        fd = 0.F; // Determined later as 1 - alpha_src;
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        break;
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      case AlphaComposite.DST_OVER:
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        fs = 1.F; // Determined later as 1 - alpha_dst.
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        fd= 1.F;
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        break;
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      case AlphaComposite.SRC:
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        fs = 1.F;
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        fd= 0.F;
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        break;
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      case AlphaComposite.SRC_ATOP:
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        fs = 1.F; // Determined later as alpha_dst;
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        fd = 1.F; // Determined later as 1 - alpha_src;
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        break;
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      case AlphaComposite.SRC_IN:
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        fs = 0.F; // Determined later as alpha_dst;
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        fd = 0.F;
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        break;
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      case AlphaComposite.SRC_OUT:
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        fs = 0.F; // Determined later as 1 - alpha_dst;
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        fd = 0.F;
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        break;
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      case AlphaComposite.SRC_OVER:
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        fs = 1.F;
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        fd= 1.F; // Determined later as 1 - alpha_src.
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        break;
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      case AlphaComposite.XOR:
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        fs = 1.F; // Determined later as 1 - alpha_dst.
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        fd= 1.F; // Determined later as 1 - alpha_src.
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        break;
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      default:
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        throw new AWTError("Illegal AlphaComposite rule");
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    }
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  }
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  /**
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   * Releases all resources held by this composite object.
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   */
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  public void dispose()
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  {
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    // Nothing to do here yet.
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  }
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  /**
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   * Performs compositing according to the rules specified in the
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   * AlphaComposite from the constructor.
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   */
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  public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
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  {
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    // TODO: This implementation is very general and highly inefficient. There
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    // are two possible ways to optimize this:
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    // 1. Special cased implementations for common ColorModels and transfer
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    //    types.
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    // 2. Native implementation.
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    int x0 = src.getMinX();
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    int y0 = src.getMinY();
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    int width = src.getWidth();
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    int height = src.getHeight();
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    int x1 = x0 + width;
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    int y1 = y0 + height;
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    Object srcPixel = null;
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    Object dstPixel = null;
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    // Prepare the array that holds the color and alpha components of the
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    // source pixels.
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    float[] srcComponents;
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    int srcComponentsLength = srcColorModel.getNumComponents();
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    if (! srcColorModel.hasAlpha())
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      srcComponentsLength += 1;
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    srcComponents = new float[srcComponentsLength];
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    // Prepare the array that holds the color and alpha components of the
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    // destination pixels.
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    float[] dstComponents;
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    int dstComponentsLength = dstColorModel.getNumComponents();
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    if (! dstColorModel.hasAlpha())
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      dstComponentsLength += 1;
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    dstComponents = new float[dstComponentsLength];
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    if (srcComponentsLength != dstComponentsLength)
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      throw new AWTError("The color models of the source and destination have"
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                         + "incompatible number of color components");
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    int srcTransferType = srcColorModel.getTransferType();
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    int dstTransferType = dstColorModel.getTransferType();
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    for (int y = y0; y < y1; y++)
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      {
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        for (int x = x0; x < x1; x++)
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          {
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            // Fetch source pixel.
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            srcPixel = src.getDataElements(x, y, (int[]) srcPixel);
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            // Fetch destination pixel.
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            dstPixel = dstIn.getDataElements(x, y, dstPixel);
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            // Get normalized components. This is the only type that is
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            // guaranteed to be supported by all ColorModels.
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            srcComponents =
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              srcColorModel.getNormalizedComponents(srcPixel, srcComponents, 0);
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            if (! srcColorModel.hasAlpha())
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              srcComponents[srcComponentsLength - 1] = 1.0F;
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            dstComponents =
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              dstColorModel.getNormalizedComponents(dstPixel, dstComponents, 0);
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            if (! dstColorModel.hasAlpha())
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              dstComponents[dstComponentsLength - 1] = 1.0F;
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            // Prepare the input.
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            float compositeAlpha = composite.getAlpha();
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            srcComponents[srcComponentsLength - 1] *= compositeAlpha;
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            if (srcColorModel.isAlphaPremultiplied())
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              {
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                for (int i = srcComponentsLength - 2; i >= 0; i--)
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                  srcComponents[i] *= compositeAlpha;
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              }
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            else
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              {
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                for (int i = srcComponentsLength - 2; i >= 0; i--)
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                  srcComponents[i] *= srcComponents[srcComponentsLength - 1];
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              }
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            if (! dstColorModel.isAlphaPremultiplied())
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              {
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                for (int i = dstComponentsLength - 2; i >= 0; i--)
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                  dstComponents[i] *= dstComponents[dstComponents.length - 1];
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              }
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            // Determine the blending factors according to the rule in the
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            // AlphaComposite. For some rules the factors must be determined
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            // dynamically because they depend on the actual pixel value.
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            float srcAlpha = srcComponents[srcComponentsLength - 1];
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            float dstAlpha = dstComponents[dstComponentsLength - 1];
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            switch (composite.getRule())
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            {
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              case AlphaComposite.DST_ATOP:
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                fs = 1.F - dstAlpha;
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                fd = srcAlpha;
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                break;
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              case AlphaComposite.DST_IN:
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                fd = srcAlpha;
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                break;
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              case AlphaComposite.DST_OUT:
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                fd = 1.F - srcAlpha;
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                break;
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              case AlphaComposite.DST_OVER:
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                fs = 1.F - dstAlpha;
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                break;
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              case AlphaComposite.SRC_ATOP:
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                fs = srcAlpha;
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                fd = 1.F - srcAlpha;
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                break;
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              case AlphaComposite.SRC_IN:
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                fs = dstAlpha;
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                break;
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              case AlphaComposite.SRC_OUT:
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                fs = 1.F - dstAlpha;
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                break;
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              case AlphaComposite.SRC_OVER:
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                fd= 1.F - srcAlpha;
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                break;
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              case AlphaComposite.XOR:
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                fs = 1.F - dstAlpha;
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                fd= 1.F - srcAlpha;
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                break;
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              default:
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                // For the other cases the factors have already been determined
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                // in the constructor.
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            }
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            // Apply the blending equation to the pixels.
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            for (int i = 0; i < srcComponentsLength; i++)
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              {
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                dstComponents[i] = srcComponents[i] * fs
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                                   + dstComponents[i] * fd;
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              }
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            // Convert the result back when the destination is not
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            // alpha-premultiplied.
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            dstAlpha = dstComponents[dstComponentsLength - 1];
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            if (!dstColorModel.isAlphaPremultiplied() && dstAlpha != 0.F)
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              {
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                for (int i = 0; i < dstComponentsLength - 1; i++)
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                  {
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                    dstComponents[i] = dstComponents[i] / dstAlpha;
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                  }
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              }
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            // Store the result in the destination raster.
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            dstPixel = dstColorModel.getDataElements(dstComponents, 0,
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                                                     dstPixel);
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            dstOut.setDataElements(x, y, dstPixel);
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          } // End X loop.
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      } // End Y loop.
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  }
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}

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