/* * Copyright (c) 1997, 1999, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt.image;  /** * The <code>Kernel</code> class defines a matrix that describes how a * specified pixel and its surrounding pixels affect the value * computed for the pixel's position in the output image of a filtering * operation.  The X origin and Y origin indicate the kernel matrix element * that corresponds to the pixel position for which an output value is * being computed. * * @see ConvolveOp */public class Kernel implements Cloneable {    private int  width;    private int  height;    private int  xOrigin;    private int  yOrigin;    private float data[];     private static native void initIDs();    static {        ColorModel.loadLibraries();        initIDs();    }     /**     * Constructs a <code>Kernel</code> object from an array of floats.     * The first <code>width</code>*<code>height</code> elements of     * the <code>data</code> array are copied.     * If the length of the <code>data</code> array is less     * than width*height, an <code>IllegalArgumentException</code> is thrown.     * The X origin is (width-1)/2 and the Y origin is (height-1)/2.     * @param width         width of the kernel     * @param height        height of the kernel     * @param data          kernel data in row major order     * @throws IllegalArgumentException if the length of <code>data</code>     *         is less than the product of <code>width</code> and     *         <code>height</code>     */    public Kernel(int width, int height, float data[]) {        this.width  = width;        this.height = height;        this.xOrigin  = (width-1)>>1;        this.yOrigin  = (height-1)>>1;        int len = width*height;        if (data.length < len) {            throw new IllegalArgumentException("Data array too small "+                                               "(is "+data.length+                                               " and should be "+len);        }        this.data = new float[len];        System.arraycopy(data, 0, this.data, 0, len);     }     /**     * Returns the X origin of this <code>Kernel</code>.     * @return the X origin.     */    final public int getXOrigin(){        return xOrigin;    }     /**     * Returns the Y origin of this <code>Kernel</code>.     * @return the Y origin.     */    final public int getYOrigin() {        return yOrigin;    }     /**     * Returns the width of this <code>Kernel</code>.     * @return the width of this <code>Kernel</code>.     */    final public int getWidth() {        return width;    }     /**     * Returns the height of this <code>Kernel</code>.     * @return the height of this <code>Kernel</code>.     */    final public int getHeight() {        return height;    }     /**     * Returns the kernel data in row major order.     * The <code>data</code> array is returned.  If <code>data</code>     * is <code>null</code>, a new array is allocated.     * @param data  if non-null, contains the returned kernel data     * @return the <code>data</code> array containing the kernel data     *         in row major order or, if <code>data</code> is     *         <code>null</code>, a newly allocated array containing     *         the kernel data in row major order     * @throws IllegalArgumentException if <code>data</code> is less     *         than the size of this <code>Kernel</code>     */    final public float[] getKernelData(float[] data) {        if (data == null) {            data = new float[this.data.length];        }        else if (data.length < this.data.length) {            throw new IllegalArgumentException("Data array too small "+                                               "(should be "+this.data.length+                                               " but is "+                                               data.length+" )");        }        System.arraycopy(this.data, 0, data, 0, this.data.length);         return data;    }     /**     * Clones this object.     * @return a clone of this object.     */    public Object clone() {        try {            return super.clone();        } catch (CloneNotSupportedException e) {            // this shouldn't happen, since we are Cloneable            throw new InternalError();        }    }}