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 }