org.apache.commons.imaging.formats.png.scanlinefilters.ScanlineFilterUp Maven / Gradle / Ivy

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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.

There is a newer version: 1.0.0-alpha4

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.imaging.formats.png.scanlinefilters;

import java.io.IOException;

import org.apache.commons.imaging.ImageReadException;

public class ScanlineFilterUp implements ScanlineFilter {

    @Override
    public void unfilter(final byte[] src, final byte[] dst, final byte[] up)
            throws ImageReadException, IOException {
        for (int i = 0; i < src.length; i++) {
            // byte b;

            if (up != null) {
                dst[i] = (byte) ((src[i] + up[i]) % 256);
            } else {
                dst[i] = src[i];
            }

            // if(i<10)
            // System.out.println("\t" + i + ": " + dst[i]);
            // dst[i] = b;
            // dst[i] = src[i];
            // dst[i] = (byte) 0;
        }
    }
}