JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2001, 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.lang.ref.WeakReference;
import sun.java2d.loops.GraphicsPrimitive;
import sun.java2d.SurfaceData;
import sun.java2d.pipe.Region;

/**
 * ScaledBlit
 * 1) copies rectangle of pixels from one surface to another
 *    while scaling the pixels to meet the sizes specified
 * 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 ScaledBlit extends GraphicsPrimitive
{
    public static final String methodSignature = "ScaledBlit(...)".toString();

    public static final int primTypeID = makePrimTypeID();

    private static RenderCache blitcache = new RenderCache(20);

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

    public static ScaledBlit getFromCache(SurfaceType src,
                                          CompositeType comp,
                                          SurfaceType dst)
    {
        Object o = blitcache.get(src, comp, dst);
        if (o != null) {
            return (ScaledBlit) o;
        }
        ScaledBlit blit = locate(src, comp, dst);
        if (blit == null) {
            /*
            System.out.println("blit loop not found for:");
            System.out.println("src:  "+src);
            System.out.println("comp: "+comp);
            System.out.println("dst:  "+dst);
            */
        } else {
            blitcache.put(src, comp, dst, blit);
        }
        return blit;
    }

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

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

    public native void Scale(SurfaceData src, SurfaceData dst,
                             Composite comp, Region clip,
                             int sx1, int sy1,
                             int sx2, int sy2,
                             double dx1, double dy1,
                             double dx2, double dy2);

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

    public GraphicsPrimitive makePrimitive(SurfaceType srctype,
                                           CompositeType comptype,
                                           SurfaceType dsttype)
    {
        /*
        System.out.println("Constructing general blit for:");
        System.out.println("src:  "+srctype);
        System.out.println("comp: "+comptype);
        System.out.println("dst:  "+dsttype);
        */
        return null;
    }

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

    private static class TraceScaledBlit extends ScaledBlit {
        ScaledBlit target;

        public TraceScaledBlit(ScaledBlit target) {
            super(target.getSourceType(),
                  target.getCompositeType(),
                  target.getDestType());
            this.target = target;
        }


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