317 lines
11 KiB
Java
317 lines
11 KiB
Java
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/* 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 sun.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 SunCompositeContext
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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 SunCompositeContext(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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