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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.png.scanlinefilters;
18  
19  import java.io.IOException;
20  
21  import org.apache.commons.imaging.ImageReadException;
22  
23  public class ScanlineFilterUp implements ScanlineFilter {
24  
25      @Override
26      public void unfilter(final byte[] src, final byte[] dst, final byte[] up)
27              throws ImageReadException, IOException {
28          for (int i = 0; i < src.length; i++) {
29              // byte b;
30  
31              if (up != null) {
32                  dst[i] = (byte) ((src[i] + up[i]) % 256);
33              } else {
34                  dst[i] = src[i];
35              }
36  
37              // if(i<10)
38              // System.out.println("\t" + i + ": " + dst[i]);
39              // dst[i] = b;
40              // dst[i] = src[i];
41              // dst[i] = (byte) 0;
42          }
43      }
44  }