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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  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  package org.apache.commons.imaging.formats.bmp;
18  
19  import java.io.ByteArrayInputStream;
20  import java.io.IOException;
21  import java.io.InputStream;
22  import java.util.Objects;
23  
24  import org.apache.commons.imaging.ImagingException;
25  import org.apache.commons.imaging.common.ImageBuilder;
26  
27  abstract class AbstractPixelParser {
28  
29      final BmpHeaderInfo bhi;
30      final byte[] colorTable;
31      final byte[] imageData;
32  
33      final InputStream is;
34  
35      AbstractPixelParser(final BmpHeaderInfo bmpHeaderInfo, final byte[] colorTable, final byte[] imageData) {
36          this.bhi = Objects.requireNonNull(bmpHeaderInfo, "bmpHeaderInfo");
37          this.colorTable = colorTable;
38          this.imageData = Objects.requireNonNull(imageData, "imageData");
39  
40          is = new ByteArrayInputStream(imageData);
41      }
42  
43      int getColorTableRgb(final int index) {
44          final int actual = index * 4;
45          final int blue = 0xff & colorTable[actual + 0];
46          final int green = 0xff & colorTable[actual + 1];
47          final int red = 0xff & colorTable[actual + 2];
48          final int alpha = 0xff;
49  
50          return alpha << 24 | red << 16 | green << 8 | blue << 0;
51      }
52  
53      public abstract void processImage(ImageBuilder imageBuilder) throws ImagingException, IOException;
54  
55  }