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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.
/**
 * 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.
/**
     * 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.
/**
     * 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.
/**
     * 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;
    }
}