src/java.desktop/macosx/classes/sun/java2d/metal/MTLVolatileSurfaceManager.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * by Oracle in the LICENSE file that accompanied this code.
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 * 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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package sun.java2d.metal;

import sun.awt.image.SunVolatileImage;
import sun.awt.image.VolatileSurfaceManager;
import sun.java2d.SurfaceData;

import java.awt.GraphicsConfiguration;
import java.awt.Transparency;
import java.awt.image.ColorModel;
import sun.java2d.pipe.hw.AccelSurface;

public class MTLVolatileSurfaceManager extends VolatileSurfaceManager {

    private final boolean accelerationEnabled;

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

        /*
         * We will attempt to accelerate this image only
         * if the image is not bitmask
         */
        int transparency = vImg.getTransparency();
        accelerationEnabled = transparency != Transparency.BITMASK;
    }

    protected boolean isAccelerationEnabled() {
        return accelerationEnabled;
    }

    /**
     * Create a SurfaceData object (or init the backbuffer
     * of an existing window if this is a double buffered GraphicsConfig)
     */
    protected SurfaceData initAcceleratedSurface() {
        try {
            MTLGraphicsConfig gc =
                (MTLGraphicsConfig)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 RT_TEXTURE
            if (type == AccelSurface.UNDEFINED) {
                type = AccelSurface.RT_TEXTURE;
            }
            return MTLSurfaceData.createData(gc,
                                             vImg.getWidth(),
                                             vImg.getHeight(),
                                             cm, vImg, type);
        } catch (NullPointerException | OutOfMemoryError ignored) {
            return null;
        }
    }

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

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