/*

 * Copyright 2003 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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;

    }

}