/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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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;
}
}