1 /* Copyright (C) 2000, 2002, 2004  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., 51 Franklin Street, Fifth Floor, Boston, MA
18 02110-1301 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.RenderingHints;
40 import java.awt.geom.Point2D;
41 import java.awt.geom.Rectangle2D;
42 import java.awt.image.ComponentSampleModel;
43 import java.awt.image.DataBuffer;
44 import java.awt.image.Raster;
45 import java.awt.image.RasterOp;
46 import java.awt.image.WritableRaster;
47 
48 /**
49  * This raster copy operation assumes that both source and destination
50  * sample models are tightly pixel packed and contain the same number
51  * of bands.
52  *
53  * @throws java.lang.ClassCastException if the sample models of the
54  * rasters are not of type ComponentSampleModel.
55  *
56  * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
57  */
58 public class ComponentDataBlitOp implements RasterOp
59 {
60   public static final ComponentDataBlitOp INSTANCE = new ComponentDataBlitOp();
61 
filter(Raster src, WritableRaster dest)62   public WritableRaster filter(Raster src, WritableRaster dest)
63   {
64     if (dest == null)
65       dest = createCompatibleDestRaster(src);
66 
67     DataBuffer  srcDB =  src.getDataBuffer();
68     DataBuffer destDB = dest.getDataBuffer();
69 
70     ComponentSampleModel  srcSM = (ComponentSampleModel)  src.getSampleModel();
71     ComponentSampleModel destSM = (ComponentSampleModel) dest.getSampleModel();
72 
73 
74     // Calculate offset to data in the underlying arrays:
75 
76     int  srcScanlineStride =  srcSM.getScanlineStride();
77     int destScanlineStride = destSM.getScanlineStride();
78     int srcX  =  src.getMinX() -  src.getSampleModelTranslateX();
79     int srcY  =  src.getMinY() -  src.getSampleModelTranslateY();
80     int destX = dest.getMinX() - dest.getSampleModelTranslateX();
81     int destY = dest.getMinY() - dest.getSampleModelTranslateY();
82 
83     int numBands = srcSM.getNumBands();
84 
85     /* We can't use getOffset(x, y) from the sample model since we
86        don't want the band offset added in. */
87 
88     int srcOffset =
89       numBands*srcX + srcScanlineStride*srcY +    // from sample model
90       srcDB.getOffset();                          // from data buffer
91 
92     int destOffset =
93       numBands*destX + destScanlineStride*destY + // from sample model
94       destDB.getOffset();                         // from data buffer
95 
96     // Determine how much, and how many times to blit.
97 
98     int rowSize = src.getWidth()*numBands;
99     int h = src.getHeight();
100 
101     if ((rowSize == srcScanlineStride) &&
102         (rowSize == destScanlineStride))
103       {
104         // collapse scan line blits to one large blit.
105         rowSize *= h;
106         h = 1;
107       }
108 
109 
110     // Do blitting
111 
112     Object srcArray  = Buffers.getData(srcDB);
113     Object destArray = Buffers.getData(destDB);
114 
115     for (int yd = 0; yd<h; yd++)
116       {
117         System.arraycopy(srcArray, srcOffset,
118                          destArray, destOffset,
119                          rowSize);
120         srcOffset  +=  srcScanlineStride;
121         destOffset += destScanlineStride;
122       }
123 
124 
125     return dest;
126   }
127 
getBounds2D(Raster src)128   public Rectangle2D getBounds2D(Raster src)
129   {
130     return src.getBounds();
131   }
132 
createCompatibleDestRaster(Raster src)133   public WritableRaster createCompatibleDestRaster(Raster src) {
134 
135     /* FIXME: Maybe we should explicitly create a raster with a
136        tightly pixel packed sample model, rather than assuming
137        that the createCompatibleWritableRaster() method in Raster
138        will create one. */
139 
140     return src.createCompatibleWritableRaster();
141   }
142 
getPoint2D(Point2D srcPoint, Point2D destPoint)143   public Point2D getPoint2D(Point2D srcPoint, Point2D destPoint)
144   {
145     if (destPoint == null)
146       return (Point2D) srcPoint.clone();
147 
148     destPoint.setLocation(srcPoint);
149     return destPoint;
150   }
151 
getRenderingHints()152   public RenderingHints getRenderingHints()
153   {
154     throw new UnsupportedOperationException("not implemented");
155   }
156 }
157