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1: /* Kernel.java -- Java class for an image processing kernel 2: Copyright (C) 2004, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package java.awt.image; 40: 41: /** 42: * Kernel represents an image processing kernel. It gets used to hold 43: * convolution filters among other purposes. It stores an array of float 44: * values representing a 2-dimensional array in row-major order. 45: * 46: * @author Jerry Quinn (jlquinn@optonline.net) 47: * @version 1.0 48: */ 49: public class Kernel implements Cloneable 50: { 51: private final int width; 52: private final int height; 53: private final float[] data; 54: 55: /** 56: * Creates a new <code>Kernel</code> instance. 57: * 58: * @param width The 2D width of data. 59: * @param height The 2D height of data. 60: * @param data The source data array. 61: * @exception IllegalArgumentException if width * height < data.length. 62: */ 63: public Kernel(int width, int height, float[] data) 64: throws IllegalArgumentException 65: { 66: this.width = width; 67: this.height = height; 68: if (data.length < width * height || width < 0 || height < 0) 69: throw new IllegalArgumentException(); 70: this.data = new float[width * height]; 71: System.arraycopy(data, 0, this.data, 0, width * height); 72: } 73: 74: /** 75: * Return the X origin: (width - 1) / 2 76: */ 77: public final int getXOrigin() 78: { 79: return (width - 1) / 2; 80: } 81: 82: /** 83: * Return the Y origin: (height - 1) / 2 84: */ 85: public final int getYOrigin() 86: { 87: return (height - 1) / 2; 88: } 89: 90: /** 91: * @return The kernel width. 92: */ 93: public final int getWidth() 94: { 95: return width; 96: } 97: 98: /** 99: * @return The kernel height. 100: */ 101: public final int getHeight() 102: { 103: return height; 104: } 105: 106: /** 107: * Return the kernel data. 108: * 109: * If data is null, allocates a new array and returns it. Otherwise, the 110: * kernel values are copied into data. 111: * 112: * @param data Array to copy values into, or null. 113: * @return The array with copied values. 114: * @exception IllegalArgumentException if data != null and too small. 115: */ 116: public final float[] getKernelData(float[] data) 117: throws IllegalArgumentException 118: { 119: if (data == null) 120: return (float[])this.data.clone(); 121: 122: if (data.length < this.data.length) 123: throw new IllegalArgumentException(); 124: 125: System.arraycopy(this.data, 0, data, 0, this.data.length); 126: return data; 127: } 128: 129: /** 130: * @return a clone of this Kernel. 131: */ 132: public Object clone() 133: { 134: try 135: { 136: return super.clone(); 137: } 138: catch (CloneNotSupportedException e) 139: { 140: throw (Error) new InternalError().initCause(e); // Impossible 141: } 142: } 143: }
GNU Classpath (0.20) |