JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2004, 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.Composite;
import java.awt.geom.AffineTransform;
import java.lang.ref.WeakReference;
import sun.java2d.SurfaceData;
import sun.java2d.loops.GraphicsPrimitive;
import sun.java2d.pipe.Region;

/**
 * TransformHelper
 * 1) applies an AffineTransform to a rectangle of pixels while copying
 *    from one surface to another
 * 2) performs compositing of colors based upon a Composite
 *    parameter
 *
 * precise behavior is undefined if the source surface
 * and the destination surface are the same surface
 * with overlapping regions of pixels
 */
public class TransformHelper extends GraphicsPrimitive
{
    public static final String methodSignature =
        "TransformHelper(...)".toString();

    public static final int primTypeID = makePrimTypeID();

    private static RenderCache helpercache = new RenderCache(10);

    public static TransformHelper locate(SurfaceType srctype) {
        return (TransformHelper)
            GraphicsPrimitiveMgr.locate(primTypeID,
                                        srctype,
                                        CompositeType.SrcNoEa,
                                        SurfaceType.IntArgbPre);
    }

    public static synchronized TransformHelper getFromCache(SurfaceType src) {
        Object o = helpercache.get(src, null, null);
        if (o != null) {
            return (TransformHelper) o;
        }
        TransformHelper helper = locate(src);
        if (helper == null) {
            /*
            System.out.println("helper loop not found for:");
            System.out.println("src:  "+src);
            */
        } else {
            helpercache.put(src, null, null, helper);
        }
        return helper;
    }

    protected TransformHelper(SurfaceType srctype) {
        super(methodSignature, primTypeID, srctype,
              CompositeType.SrcNoEa,
              SurfaceType.IntArgbPre);
    }

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

    public native void Transform(MaskBlit output,
                                 SurfaceData src, SurfaceData dst,
                                 Composite comp, Region clip,
                                 AffineTransform itx, int txtype,
                                 int sx1, int sy1, int sx2, int sy2,
                                 int dx1, int dy1, int dx2, int dy2,
                                 int edges[], int dxoff, int dyoff);

    public GraphicsPrimitive makePrimitive(SurfaceType srctype,
                                           CompositeType comptype,
                                           SurfaceType dsttype)
    {
        return null;
    }

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

    private static class TraceTransformHelper extends TransformHelper {
        TransformHelper target;

        public TraceTransformHelper(TransformHelper target) {
            super(target.getSourceType());
            this.target = target;
        }

        public GraphicsPrimitive traceWrap() {
            return this;
        }

        public void Transform(MaskBlit output,
                              SurfaceData src, SurfaceData dst,
                              Composite comp, Region clip,

/**代码未完, 请加载全部代码(NowJava.com).**/