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/*
* 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.
*/
/**
* @author Oleg V. Khaschansky
* @version $Revision$
*
* @date: Sep 28, 2005
*/
package java.awt.image;
import org.apache.harmony.awt.internal.nls.Messages;
/**
* The Kernel class provides a matrix. This matrix is stored as a float array
* which describes how a specified pixel affects the value calculated for
* the pixel's position in the output image of a filtering operation.
* The X, Y origins indicate the kernel matrix element which corresponds to
* the pixel position for which an output value is being calculated.
*/
public class Kernel implements Cloneable {
/** The x origin. */
private final int xOrigin;
/** The y origin. */
private final int yOrigin;
/** The width. */
private int width;
/** The height. */
private int height;
/** The data. */
float data[];
/**
* Instantiates a new Kernel with the specified float array.
* The width*height elements of the data array are copied.
*
* @param width the width of the Kernel.
* @param height the height of the Kernel.
* @param data the data of Kernel.
*/
public Kernel(int width, int height, float[] data) {
int dataLength = width*height;
if (data.length < dataLength) {
// awt.22B=Length of data should not be less than width*height
throw new IllegalArgumentException(Messages.getString("awt.22B")); //$NON-NLS-1$
}
this.width = width;
this.height = height;
this.data = new float[dataLength];
System.arraycopy(data, 0, this.data, 0, dataLength);
xOrigin = (width-1)/2;
yOrigin = (height-1)/2;
}
/**
* Gets the width of this Kernel.
*
* @return the width of this Kernel.
*/
public final int getWidth() {
return width;
}
/**
* Gets the height of this Kernel.
*
* @return the height of this Kernel.
*/
public final int getHeight() {
return height;
}
/**
* Gets the float data array of this Kernel.
*
* @param data the float array where the resulted data will be stored.
*
* @return the float data array of this Kernel.
*/
public final float[] getKernelData(float[] data) {
if (data == null) {
data = new float[this.data.length];
}
System.arraycopy(this.data, 0, data, 0, this.data.length);
return data;
}
/**
* Gets the X origin of this Kernel.
*
* @return the X origin of this Kernel.
*/
public final int getXOrigin() {
return xOrigin;
}
/**
* Gets the Y origin of this Kernel.
*
* @return the Y origin of this Kernel.
*/
public final int getYOrigin() {
return yOrigin;
}
/**
* Returns a copy of this Kernel object.
*
* @return the copy of this Kernel object.
*/
@Override
public Object clone() {
return new Kernel(width, height, data);
}
}
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