JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1999, 2013, 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.loops;

import java.awt.Paint;
import java.awt.PaintContext;
import java.awt.Composite;
import java.awt.Rectangle;
import java.awt.image.ColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import sun.awt.image.BufImgSurfaceData;
import sun.java2d.loops.GraphicsPrimitive;
import sun.java2d.SunGraphics2D;
import sun.java2d.SurfaceData;
import sun.java2d.pipe.Region;

/**
 * MaskFill
 * 1) fills rectangles of pixels on a surface
 * 2) performs compositing of colors based upon a Composite
 *    parameter
 * 3) blends result of composite with destination using an
 *    alpha coverage mask
 * 4) the mask may be null in which case it should be treated
 *    as if it were an array of all opaque values (0xff)
 */
public class MaskFill extends GraphicsPrimitive
{
    public static final String methodSignature = "MaskFill(...)".toString();
    public static final String fillPgramSignature =
        "FillAAPgram(...)".toString();
    public static final String drawPgramSignature =
        "DrawAAPgram(...)".toString();

    public static final int primTypeID = makePrimTypeID();

    private static RenderCache fillcache = new RenderCache(10);

    public static MaskFill locate(SurfaceType srctype,
                                  CompositeType comptype,
                                  SurfaceType dsttype)
    {
        return (MaskFill)
            GraphicsPrimitiveMgr.locate(primTypeID,
                                        srctype, comptype, dsttype);
    }

    public static MaskFill locatePrim(SurfaceType srctype,
                                      CompositeType comptype,
                                      SurfaceType dsttype)
    {
        return (MaskFill)
            GraphicsPrimitiveMgr.locatePrim(primTypeID,
                                            srctype, comptype, dsttype);
    }

    /*
     * Note that this uses locatePrim, not locate, so it can return
     * null if there is no specific loop to handle this op...
     */
    public static MaskFill getFromCache(SurfaceType src,
                                        CompositeType comp,
                                        SurfaceType dst)
    {
        Object o = fillcache.get(src, comp, dst);
        if (o != null) {
            return (MaskFill) o;
        }
        MaskFill fill = locatePrim(src, comp, dst);
        if (fill != null) {
            fillcache.put(src, comp, dst, fill);
        }
        return fill;
    }

    protected MaskFill(String alternateSignature,
                       SurfaceType srctype,
                       CompositeType comptype,
                       SurfaceType dsttype)
    {
        super(alternateSignature, primTypeID, srctype, comptype, dsttype);
    }

    protected MaskFill(SurfaceType srctype,
                       CompositeType comptype,
                       SurfaceType dsttype)
    {
        super(methodSignature, primTypeID, srctype, comptype, dsttype);
    }

    public MaskFill(long pNativePrim,
                    SurfaceType srctype,
                    CompositeType comptype,
                    SurfaceType dsttype)
    {
        super(pNativePrim, methodSignature, primTypeID, srctype, comptype, dsttype);
    }

    /**
     * All MaskFill implementors must have this invoker method
     */
    public native void MaskFill(SunGraphics2D sg2d, SurfaceData sData,
                                Composite comp,
                                int x, int y, int w, int h,
                                byte[] mask, int maskoff, int maskscan);

    public native void FillAAPgram(SunGraphics2D sg2d, SurfaceData sData,
                                   Composite comp,
                                   double x, double y,
                                   double dx1, double dy1,
                                   double dx2, double dy2);

    public native void DrawAAPgram(SunGraphics2D sg2d, SurfaceData sData,
                                   Composite comp,
                                   double x, double y,
                                   double dx1, double dy1,
                                   double dx2, double dy2,
                                   double lw1, double lw2);

    public boolean canDoParallelograms() {
        return (getNativePrim() != 0);
    }

    static {
        GraphicsPrimitiveMgr.registerGeneral(new MaskFill(null, null, null));
    }

    public GraphicsPrimitive makePrimitive(SurfaceType srctype,
                                           CompositeType comptype,
                                           SurfaceType dsttype)
    {
        if (SurfaceType.OpaqueColor.equals(srctype) ||
            SurfaceType.AnyColor.equals(srctype))
        {
            if (CompositeType.Xor.equals(comptype)) {
                throw new InternalError("Cannot construct MaskFill for " +
                                        "XOR mode");
            } else {
                return new General(srctype, comptype, dsttype);
            }
        } else {
            throw new InternalError("MaskFill can only fill with colors");
        }
    }

    private static class General extends MaskFill {
        FillRect fillop;
        MaskBlit maskop;

        public General(SurfaceType srctype,
                       CompositeType comptype,
                       SurfaceType dsttype)
        {
            super(srctype, comptype, dsttype);
            fillop = FillRect.locate(srctype,
                                     CompositeType.SrcNoEa,
                                     SurfaceType.IntArgb);
            maskop = MaskBlit.locate(SurfaceType.IntArgb, comptype, dsttype);
        }

        public void MaskFill(SunGraphics2D sg2d,
                             SurfaceData sData,
                             Composite comp,
                             int x, int y, int w, int h,
                             byte mask[], int offset, int scan)
        {
            BufferedImage dstBI =
                new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
            SurfaceData tmpData = BufImgSurfaceData.createData(dstBI);

            // REMIND: This is not pretty.  It would be nicer if we
            // passed a "FillData" object to the Pixel loops, instead
            // of a SunGraphics2D parameter...
            Region clip = sg2d.clipRegion;
            sg2d.clipRegion = null;
            int pixel = sg2d.pixel;
            sg2d.pixel = tmpData.pixelFor(sg2d.getColor());
            fillop.FillRect(sg2d, tmpData, 0, 0, w, h);
            sg2d.pixel = pixel;
            sg2d.clipRegion = clip;

            maskop.MaskBlit(tmpData, sData, comp, null,
                            0, 0, x, y, w, h,
                            mask, offset, scan);
        }
    }

    public GraphicsPrimitive traceWrap() {
        return new TraceMaskFill(this);
    }

    private static class TraceMaskFill extends MaskFill {
        MaskFill target;
        MaskFill fillPgramTarget;
        MaskFill drawPgramTarget;

        public TraceMaskFill(MaskFill target) {
            super(target.getSourceType(),
                  target.getCompositeType(),
                  target.getDestType());
            this.target = target;
            this.fillPgramTarget = new MaskFill(fillPgramSignature,
                                                target.getSourceType(),
                                                target.getCompositeType(),
                                                target.getDestType());
            this.drawPgramTarget = new MaskFill(drawPgramSignature,
                                                target.getSourceType(),
                                                target.getCompositeType(),
                                                target.getDestType());
        }

        public GraphicsPrimitive traceWrap() {
            return this;
        }

        public void MaskFill(SunGraphics2D sg2d, SurfaceData sData,
                             Composite comp,
                             int x, int y, int w, int h,
                             byte[] mask, int maskoff, int maskscan)
        {
            tracePrimitive(target);
            target.MaskFill(sg2d, sData, comp, x, y, w, h,
                            mask, maskoff, maskscan);
        }


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