ComponentTransferRed


1   /*
2   
3      Copyright 2001,2003  The Apache Software Foundation 
4   
5      Licensed under the Apache License, Version 2.0 (the "License");
6      you may not use this file except in compliance with the License.
7      You may obtain a copy of the License at
8   
9          http://www.apache.org/licenses/LICENSE-2.0
10  
11     Unless required by applicable law or agreed to in writing, software
12     distributed under the License is distributed on an "AS IS" BASIS,
13     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14     See the License for the specific language governing permissions and
15     limitations under the License.
16  
17   */
18  package org.apache.batik.ext.awt.image.rendered;
19  
20  import java.awt.RenderingHints  ;
21  import java.awt.image.ByteLookupTable  ;
22  import java.awt.image.LookupOp  ;
23  import java.awt.image.WritableRaster  ;
24  
25  import org.apache.batik.ext.awt.image.GraphicsUtil;
26  import org.apache.batik.ext.awt.image.TransferFunction;
27  
28  /**
29   *
30   * @author <a HREF="mailto:thomas.deweese@kodak.com">Thomas DeWeese</a>
31   * @version $Id: ComponentTransferRed.java,v 1.4 2004/08/18 07:14:08 vhardy Exp $
32   */
33  public class ComponentTransferRed extends AbstractRed {
34      LookupOp   operation;
35  
36      /**
37       * The constructor will instantiate a LookupOp instance using
38       * a LookupOp, which is built using the four LUT
39       * data obtained by the TransferFunction objects
40       * funcs[0] : Alpha component transfer function
41       * funcs[1] : Red component transfer function
42       * funcs[2] : Green component transfer function
43       * funcs[3] : Blue component transfer function
44       */
45      public ComponentTransferRed(CachableRed src,
46                                  TransferFunction [] funcs,
47                                  RenderingHints   hints) {
48          super(src, src.getBounds(), 
49                GraphicsUtil.coerceColorModel(src.getColorModel(), false),
50                src.getSampleModel(),
51                null);
52  
53          byte [][] tableData = {funcs[1].getLookupTable(), 
54                                 funcs[2].getLookupTable(),
55                                 funcs[3].getLookupTable(), 
56                                 funcs[0].getLookupTable()};
57  
58          // Note that we create an anonymous subclass here.
59          // For what ever reason this makes the Op work correctly.
60          // If you remove this, it seems to get the color channels messed
61          // up.  The downside is that I suspect that this means we are
62          // falling into a more general, and hence slower case, but
63          // at least it works....
64          operation  =  new LookupOp  (new ByteLookupTable  (0, tableData), hints) 
65              { };
66      }
67      
68      public WritableRaster   copyData(WritableRaster   wr){
69          CachableRed src = (CachableRed)getSources().elementAt(0);
70  
71          wr = src.copyData(wr);
72          GraphicsUtil.coerceData(wr, src.getColorModel(), false);
73  
74          WritableRaster   srcWR = wr.createWritableTranslatedChild(0,0);
75  
76          operation.filter(srcWR, srcWR);
77  
78          return wr;
79      }
80  }
81
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