JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.java2d;

import java.awt.Composite;
import java.awt.CompositeContext;
import java.awt.AlphaComposite;
import java.awt.image.ColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import sun.awt.image.BufImgSurfaceData;
import sun.java2d.loops.XORComposite;
import sun.java2d.loops.CompositeType;
import sun.java2d.loops.Blit;

public class SunCompositeContext implements CompositeContext {
    ColorModel srcCM;
    ColorModel dstCM;
    Composite composite;
    CompositeType comptype;

    public SunCompositeContext(AlphaComposite ac,
                               ColorModel s, ColorModel d)
    {
        if (s == null) {
            throw new NullPointerException("Source color model cannot be null");
        }
        if (d == null) {
            throw new NullPointerException("Destination color model cannot be null");
        }
        srcCM = s;
        dstCM = d;
        this.composite = ac;
        this.comptype = CompositeType.forAlphaComposite(ac);
    }

    public SunCompositeContext(XORComposite xc,
                               ColorModel s, ColorModel d)
    {
        if (s == null) {
            throw new NullPointerException("Source color model cannot be null");
        }
        if (d == null) {
            throw new NullPointerException("Destination color model cannot be null");
        }
        srcCM = s;
        dstCM = d;
        this.composite = xc;
        this.comptype = CompositeType.Xor;
    }

    /**
     * Release resources allocated for context.
     */
    public void dispose() {
    }

    /**
     * This method composes the two source tiles
     * and places the result in the destination tile. Note that
     * the destination can be the same object as either
     * the first or second source.
     * @param src1 The first source tile for the compositing operation.
     * @param src2 The second source tile for the compositing operation.
     * @param dst The tile where the result of the operation is stored.
     */
    public void compose(Raster srcArg, Raster dstIn, WritableRaster dstOut) {
        WritableRaster src;
        int w;
        int h;

        if (dstIn != dstOut) {
            dstOut.setDataElements(0, 0, dstIn);
        }

        // REMIND: We should be able to create a SurfaceData from just
        // a non-writable Raster and a ColorModel.  Since we need to
        // create a SurfaceData from a BufferedImage then we need to
        // make a WritableRaster since it is needed to construct a
        // BufferedImage.
        if (srcArg instanceof WritableRaster) {
            src = (WritableRaster) srcArg;
        } else {
            src = srcArg.createCompatibleWritableRaster();
            src.setDataElements(0, 0, srcArg);
        }

        w = Math.min(src.getWidth(), dstIn.getWidth());
        h = Math.min(src.getHeight(), dstIn.getHeight());

        BufferedImage srcImg = new BufferedImage(srcCM, src,
                                                 srcCM.isAlphaPremultiplied(),
                                                 null);
        BufferedImage dstImg = new BufferedImage(dstCM, dstOut,

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