AbstractTransparencyFilter.java
/*
* 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.transparencyfilters;
import java.io.IOException;
import org.apache.commons.imaging.ImagingException;
import org.apache.commons.imaging.common.BinaryFileParser;
public abstract class AbstractTransparencyFilter extends BinaryFileParser {
private final byte[] bytes;
/**
* Constructs a new instance.
*
* @param bytes bytes.
*/
public AbstractTransparencyFilter(final byte[] bytes) {
this.bytes = bytes.clone();
}
public abstract int filter(int rgb, int index) throws ImagingException, IOException;
/**
* Gets the byte at the given offset.
*
* @param offset offset.
* @return a byte.
*/
public byte getByte(final int offset) {
return bytes[offset];
}
/**
* Gets the length.
*
* @return the length
*/
public int getLength() {
return bytes.length;
}
}