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Java example source code file (CGLVolatileSurfaceManager.java)

This example Java source code file (CGLVolatileSurfaceManager.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, backbuffercapsprovider, boolean, cglgraphicsconfig, cglvolatilesurfacemanager, colormodel, component, componentpeer, extendedbuffercapabilities, image, java2d, nullpointerexception, object, outofmemoryerror, override, surfacedata, vsync_on

The CGLVolatileSurfaceManager.java Java example source code

/*
 * Copyright (c) 2011, 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
 * questions.
 */

package sun.java2d.opengl;

import java.awt.BufferCapabilities;
import static java.awt.BufferCapabilities.FlipContents.*;
import java.awt.Component;
import java.awt.GraphicsConfiguration;
import java.awt.Transparency;
import java.awt.image.ColorModel;
import java.awt.peer.ComponentPeer;

import sun.awt.image.SunVolatileImage;
import sun.awt.image.VolatileSurfaceManager;
import sun.java2d.BackBufferCapsProvider;
import sun.java2d.SurfaceData;
import static sun.java2d.opengl.OGLContext.OGLContextCaps.*;
import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
import static sun.java2d.pipe.hw.AccelSurface.*;
import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.*;

public class CGLVolatileSurfaceManager extends VolatileSurfaceManager {

    private boolean accelerationEnabled;

    public CGLVolatileSurfaceManager(SunVolatileImage vImg, Object context) {
        super(vImg, context);

        /*
         * We will attempt to accelerate this image only under the
         * following conditions:
         *   - the image is opaque OR
         *   - the image is translucent AND
         *       - the GraphicsConfig supports the FBO extension OR
         *       - the GraphicsConfig has a stored alpha channel
         */
        int transparency = vImg.getTransparency();
        CGLGraphicsConfig gc = (CGLGraphicsConfig)vImg.getGraphicsConfig();
        accelerationEnabled =
            (transparency == Transparency.OPAQUE) ||
            ((transparency == Transparency.TRANSLUCENT) &&
             (gc.isCapPresent(CAPS_EXT_FBOBJECT) ||
              gc.isCapPresent(CAPS_STORED_ALPHA)));
    }

    protected boolean isAccelerationEnabled() {
        return accelerationEnabled;
    }

    /**
     * Create a pbuffer-based SurfaceData object (or init the backbuffer
     * of an existing window if this is a double buffered GraphicsConfig)
     */
    protected SurfaceData initAcceleratedSurface() {
        SurfaceData sData = null;
        Component comp = vImg.getComponent();
        final ComponentPeer peer = (comp != null) ? comp.getPeer() : null;

        try {
            boolean createVSynced = false;
            boolean forceback = false;
            if (context instanceof Boolean) {
                forceback = ((Boolean)context).booleanValue();
                if (forceback && peer instanceof BackBufferCapsProvider) {
                    BackBufferCapsProvider provider =
                        (BackBufferCapsProvider)peer;
                    BufferCapabilities caps = provider.getBackBufferCaps();
                    if (caps instanceof ExtendedBufferCapabilities) {
                        ExtendedBufferCapabilities ebc =
                            (ExtendedBufferCapabilities)caps;
                        if (ebc.getVSync() == VSYNC_ON &&
                            ebc.getFlipContents() == COPIED)
                        {
                            createVSynced = true;
                            forceback = false;
                        }
                    }
                }
            }

            if (forceback) {
                // peer must be non-null in this case
                // TODO: modify parameter to delegate
                //                sData = CGLSurfaceData.createData(peer, vImg, FLIP_BACKBUFFER);
            } else {
                CGLGraphicsConfig gc =
                    (CGLGraphicsConfig)vImg.getGraphicsConfig();
                ColorModel cm = gc.getColorModel(vImg.getTransparency());
                int type = vImg.getForcedAccelSurfaceType();
                // if acceleration type is forced (type != UNDEFINED) then
                // use the forced type, otherwise choose one based on caps
                if (type == OGLSurfaceData.UNDEFINED) {
                    type = gc.isCapPresent(CAPS_EXT_FBOBJECT) ?
                        OGLSurfaceData.FBOBJECT : OGLSurfaceData.PBUFFER;
                }
                if (createVSynced) {
                    // TODO: modify parameter to delegate
//                  sData = CGLSurfaceData.createData(peer, vImg, type);
                } else {
                    sData = CGLSurfaceData.createData(gc,
                                                      vImg.getWidth(),
                                                      vImg.getHeight(),
                                                      cm, vImg, type);
                }
            }
        } catch (NullPointerException ex) {
            sData = null;
        } catch (OutOfMemoryError er) {
            sData = null;
        }

        return sData;
    }

    @Override
    protected boolean isConfigValid(GraphicsConfiguration gc) {
        return ((gc == null) || (gc == vImg.getGraphicsConfig()));
    }

    @Override
    public void initContents() {
        if (vImg.getForcedAccelSurfaceType() != OGLSurfaceData.TEXTURE) {
            super.initContents();
        }
    }
}

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