/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package sun.awt.image;
import java.awt.Point;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DirectColorModel;
import java.awt.image.PixelInterleavedSampleModel;
import java.awt.image.SampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.awt.image.WritableRaster;
import sun.java2d.SurfaceData;
/**
* WritableRasterNative
* This class exists to wrap a native DataBuffer object. The
* standard WritableRaster object assumes that a DataBuffer
* of a given type (e.g., DataBuffer.TYPE_INT) implies a certain
* subclass (e.g., DataBufferInt). But this is not always the
* case. DataBufferNative, for example, may allow access to
* integer-based data, but it is not DataBufferInt (which is a
* final class and cannot be subclassed).
* So this class exists simply to allow the WritableRaster
* functionality for this new kind of DataBuffer object.
*/
public class WritableRasterNative extends WritableRaster {
public static WritableRasterNative createNativeRaster(SampleModel sm,
DataBuffer db)
{
return new WritableRasterNative(sm, db);
}
protected WritableRasterNative(SampleModel sm, DataBuffer db) {
super(sm, db, new Point(0, 0));
}
public static WritableRasterNative createNativeRaster(ColorModel cm,
SurfaceData sd,
int width,
int height)
{
SampleModel smHw = null;
int dataType = 0;
int scanStride = width;
switch (cm.getPixelSize()) {
case 8:
case 12:
// 8-bits uses PixelInterleavedSampleModel
if (cm.getPixelSize() == 8) {
dataType = DataBuffer.TYPE_BYTE;
} else {
dataType = DataBuffer.TYPE_USHORT;
}
int[] bandOffsets = new int[1];
bandOffsets[0] = 0;
smHw = new PixelInterleavedSampleModel(dataType, width,
height,
1, scanStride,
bandOffsets);
break;
// all others use SinglePixelPackedSampleModel
case 15:
case 16:
dataType = DataBuffer.TYPE_USHORT;
int[] bitMasks = new int[3];
DirectColorModel dcm = (DirectColorModel)cm;
bitMasks[0] = dcm.getRedMask();
bitMasks[1] = dcm.getGreenMask();
bitMasks[2] = dcm.getBlueMask();
smHw = new SinglePixelPackedSampleModel(dataType, width,
height, scanStride,
bitMasks);
break;
case 24:
case 32:
dataType = DataBuffer.TYPE_INT;
bitMasks = new int[3];
dcm = (DirectColorModel)cm;
bitMasks[0] = dcm.getRedMask();
bitMasks[1] = dcm.getGreenMask();
bitMasks[2] = dcm.getBlueMask();
smHw = new SinglePixelPackedSampleModel(dataType, width,
height, scanStride,
bitMasks);
break;
default:
throw new InternalError("Unsupported depth " +
cm.getPixelSize());
}
DataBuffer dbn = new DataBufferNative(sd, dataType,
width, height);
return new WritableRasterNative(smHw, dbn);
}
}