JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2007, 2012, 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
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 */

package sun.java2d.opengl;

import java.awt.Color;
import java.awt.Transparency;

import sun.java2d.SurfaceData;
import sun.java2d.SurfaceDataProxy;
import sun.java2d.loops.SurfaceType;
import sun.java2d.loops.CompositeType;

/**
 * The proxy class contains the logic for when to replace a
 * SurfaceData with a cached OGL Texture and the code to create
 * the accelerated surfaces.
 */
public class OGLSurfaceDataProxy extends SurfaceDataProxy {
    public static SurfaceDataProxy createProxy(SurfaceData srcData,
                                               OGLGraphicsConfig dstConfig)
    {
        if (srcData instanceof OGLSurfaceData) {
            // srcData must be a VolatileImage which either matches
            // our pixel format or not - either way we do not cache it...
            return UNCACHED;
        }

        return new OGLSurfaceDataProxy(dstConfig, srcData.getTransparency());
    }

    OGLGraphicsConfig oglgc;
    int transparency;

    public OGLSurfaceDataProxy(OGLGraphicsConfig oglgc, int transparency) {
        this.oglgc = oglgc;
        this.transparency = transparency;
    }

    @Override
    public SurfaceData validateSurfaceData(SurfaceData srcData,
                                           SurfaceData cachedData,
                                           int w, int h)
    {
        if (cachedData == null) {
            try {
                cachedData = oglgc.createManagedSurface(w, h, transparency);
            } catch (OutOfMemoryError er) {
                return null;
            }
        }
        return cachedData;
    }

    @Override

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