1 /* Copyright (C) 2000, 2002  Free Software Foundation
2 
3 This file is part of GNU Classpath.
4 
5 GNU Classpath is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9 
10 GNU Classpath is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 General Public License for more details.
14 
15 You should have received a copy of the GNU General Public License
16 along with GNU Classpath; see the file COPYING.  If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA.
19 
20 Linking this library statically or dynamically with other modules is
21 making a combined work based on this library.  Thus, the terms and
22 conditions of the GNU General Public License cover the whole
23 combination.
24 
25 As a special exception, the copyright holders of this library give you
26 permission to link this library with independent modules to produce an
27 executable, regardless of the license terms of these independent
28 modules, and to copy and distribute the resulting executable under
29 terms of your choice, provided that you also meet, for each linked
30 independent module, the terms and conditions of the license of that
31 module.  An independent module is a module which is not derived from
32 or based on this library.  If you modify this library, you may extend
33 this exception to your version of the library, but you are not
34 obligated to do so.  If you do not wish to do so, delete this
35 exception statement from your version. */
36 
37 package gnu.java.awt;
38 
39 import java.awt.geom.*;
40 import java.awt.image.*;
41 import java.awt.RenderingHints;
42 
43 /**
44  * This raster copy operation assumes that both source and destination
45  * sample models are tightly pixel packed and contain the same number
46  * of bands.
47  *
48  * @throws java.lang.ClassCastException if the sample models of the
49  * rasters are not of type ComponentSampleModel.
50  *
51  * @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
52  */
53 public class ComponentDataBlitOp implements RasterOp
54 {
55   public static ComponentDataBlitOp INSTANCE = new ComponentDataBlitOp();
56 
filter(Raster src, WritableRaster dest)57   public WritableRaster filter(Raster src, WritableRaster dest)
58   {
59     if (dest == null)
60       dest = createCompatibleDestRaster(src);
61 
62     DataBuffer  srcDB =  src.getDataBuffer();
63     DataBuffer destDB = dest.getDataBuffer();
64 
65     ComponentSampleModel  srcSM = (ComponentSampleModel)  src.getSampleModel();
66     ComponentSampleModel destSM = (ComponentSampleModel) dest.getSampleModel();
67 
68 
69     // Calculate offset to data in the underlying arrays:
70 
71     int  srcScanlineStride =  srcSM.getScanlineStride();
72     int destScanlineStride = destSM.getScanlineStride();
73     int srcX  =  src.getMinX() -  src.getSampleModelTranslateX();
74     int srcY  =  src.getMinY() -  src.getSampleModelTranslateY();
75     int destX = dest.getMinX() - dest.getSampleModelTranslateX();
76     int destY = dest.getMinY() - dest.getSampleModelTranslateY();
77 
78     int numBands = srcSM.getNumBands();
79 
80     /* We can't use getOffset(x, y) from the sample model since we
81        don't want the band offset added in. */
82 
83     int srcOffset =
84       numBands*srcX + srcScanlineStride*srcY +    // from sample model
85       srcDB.getOffset();                          // from data buffer
86 
87     int destOffset =
88       numBands*destX + destScanlineStride*destY + // from sample model
89       destDB.getOffset();                         // from data buffer
90 
91     // Determine how much, and how many times to blit.
92 
93     int rowSize = src.getWidth()*numBands;
94     int h = src.getHeight();
95 
96     if ((rowSize == srcScanlineStride) &&
97 	(rowSize == destScanlineStride))
98       {
99 	// collapse scan line blits to one large blit.
100 	rowSize *= h;
101 	h = 1;
102       }
103 
104 
105     // Do blitting
106 
107     Object srcArray  = Buffers.getData(srcDB);
108     Object destArray = Buffers.getData(destDB);
109 
110     for (int yd = 0; yd<h; yd++)
111       {
112 	System.arraycopy(srcArray, srcOffset,
113 			 destArray, destOffset,
114 			 rowSize);
115 	srcOffset  +=  srcScanlineStride;
116 	destOffset += destScanlineStride;
117       }
118 
119 
120     return dest;
121   }
122 
getBounds2D(Raster src)123   public Rectangle2D getBounds2D(Raster src)
124   {
125     return src.getBounds();
126   }
127 
createCompatibleDestRaster(Raster src)128   public WritableRaster createCompatibleDestRaster(Raster src) {
129 
130     /* FIXME: Maybe we should explicitly create a raster with a
131        tightly pixel packed sample model, rather than assuming
132        that the createCompatibleWritableRaster() method in Raster
133        will create one. */
134 
135     return src.createCompatibleWritableRaster();
136   }
137 
getPoint2D(Point2D srcPoint, Point2D destPoint)138   public Point2D getPoint2D(Point2D srcPoint, Point2D destPoint)
139   {
140     if (destPoint == null)
141       return (Point2D) srcPoint.clone();
142 
143     destPoint.setLocation(srcPoint);
144     return destPoint;
145   }
146 
getRenderingHints()147   public RenderingHints getRenderingHints()
148   {
149     throw new UnsupportedOperationException("not implemented");
150   }
151 }
152