/* * Copyright (c) 2003, 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.awt.image; import sun.java2d.SurfaceData; /** * This SurfaceManager variant manages an unaccelerated volatile surface. * This class is created in the event that someone requested a VolatileImage * to be created from a BufferedImageGraphicsConfig, which is not platform- * or hardware-based, thus the resulting surface and surface manager * are unaccelerated.  All we do in this class is implement the abstract * methods of VolatileSurfaceManager to return values that indicate that * we cannot accelerate surfaces through this SurfaceManager, thus the * parent class will handle things through the unaccelerated backup mechanism. */public class BufImgVolatileSurfaceManager extends VolatileSurfaceManager {     /**     * This constructor simply defers to the superclass since all of the real     * functionality of this class is implemented in VolatileSurfaceManager.     */    public BufImgVolatileSurfaceManager(SunVolatileImage vImg, Object context) {        super(vImg, context);    }     /**     * Returns false to indicate that this surface manager cannot accelerate     * the image.     */    protected boolean isAccelerationEnabled() {        return false;    }     /**     * Returns null to indicate failure in creating the accelerated surface.     * Note that this method should not ever be called since creation of     * accelerated surfaces should be preceded by calls to the above     * isAccelerationEnabled() method.  But we need to override this method     * since it is abstract in our parent class.     */    protected SurfaceData initAcceleratedSurface() {        return null;    }}