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/* Copyright © 2000 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.awt;
import java.awt.geom.*;
import java.awt.image.*;
import java.awt.RenderingHints;
/**
* This raster copy operation assumes that both source and destination
* sample models are tightly pixel packed and contain the same number
* of bands.
*
* @throws java.lang.ClassCastException if the sample models of the
* rasters are not of type ComponentSampleModel.
*
* @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
*/
public class ComponentDataBlitOp implements RasterOp
{
public static ComponentDataBlitOp INSTANCE = new ComponentDataBlitOp();
public WritableRaster filter(Raster src, WritableRaster dest)
{
if (dest == null)
dest = createCompatibleDestRaster(src);
DataBuffer srcDB = src.getDataBuffer();
DataBuffer destDB = dest.getDataBuffer();
ComponentSampleModel srcSM = (ComponentSampleModel) src.getSampleModel();
ComponentSampleModel destSM = (ComponentSampleModel) dest.getSampleModel();
// Calculate offset to data in the underlying arrays:
int srcScanlineStride = srcSM.getScanlineStride();
int destScanlineStride = destSM.getScanlineStride();
int srcX = src.getMinX() - src.getSampleModelTranslateX();
int srcY = src.getMinY() - src.getSampleModelTranslateY();
int destX = dest.getMinX() - dest.getSampleModelTranslateX();
int destY = dest.getMinY() - dest.getSampleModelTranslateY();
int numBands = srcSM.getNumBands();
/* We can't use getOffset(x, y) from the sample model since we
don't want the band offset added in. */
int srcOffset =
numBands*srcX + srcScanlineStride*srcY + // from sample model
srcDB.getOffset(); // from data buffer
int destOffset =
numBands*destX + destScanlineStride*destY + // from sample model
destDB.getOffset(); // from data buffer
// Determine how much, and how many times to blit.
int rowSize = src.getWidth()*numBands;
int h = src.getHeight();
if ((rowSize == srcScanlineStride) &&
(rowSize == destScanlineStride))
{
// collapse scan line blits to one large blit.
rowSize *= h;
h = 1;
}
// Do blitting
Object srcArray = Buffers.getData(srcDB);
Object destArray = Buffers.getData(destDB);
for (int yd = 0; yd<h; yd++)
{
System.arraycopy(srcArray, srcOffset,
destArray, destOffset,
rowSize);
srcOffset += srcScanlineStride;
destOffset += destScanlineStride;
}
return dest;
}
public Rectangle2D getBounds2D(Raster src)
{
return src.getBounds();
}
public WritableRaster createCompatibleDestRaster(Raster src) {
/* FIXME: Maybe we should explicitly create a raster with a
tightly pixel packed sample model, rather than assuming
that the createCompatibleWritableRaster() method in Raster
will create one. */
return src.createCompatibleWritableRaster();
}
public Point2D getPoint2D(Point2D srcPoint, Point2D destPoint)
{
if (destPoint == null)
return (Point2D) srcPoint.clone();
destPoint.setLocation(srcPoint);
return destPoint;
}
public RenderingHints getRenderingHints()
{
throw new UnsupportedOperationException("not implemented");
}
}
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