Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* Copyright (C) 2000, 2002, 2004  Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.awt;
+
+import java.awt.RenderingHints;
+import java.awt.geom.Point2D;
+import java.awt.geom.Rectangle2D;
+import java.awt.image.ComponentSampleModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.Raster;
+import java.awt.image.RasterOp;
+import java.awt.image.WritableRaster;
+
+/**
+ * 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 final 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");
+  }
+}