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1: /* ShortLookupTable.java -- Java class for a pixel translation table. 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: * ShortLookupTable represents translation arrays for pixel values. It wraps 43: * one or more data arrays for each layer (or component) in an image, such as 44: * Alpha, R, G, and B. When doing translation, the offset is subtracted from 45: * the pixel values to allow a subset of an array to be used. 46: * 47: * @author Jerry Quinn (jlquinn@optonline.net) 48: * @version 1.0 49: */ 50: public class ShortLookupTable extends LookupTable 51: { 52: // Array of translation tables. 53: private short data[][]; 54: 55: /** 56: * Creates a new <code>ShortLookupTable</code> instance. 57: * 58: * Offset is subtracted from pixel values when looking up in the translation 59: * tables. If data.length is one, the same table is applied to all pixel 60: * components. 61: * 62: * @param offset Offset to be subtracted. 63: * @param data Array of lookup tables. 64: * @exception IllegalArgumentException if offset < 0 or data.length < 1. 65: */ 66: public ShortLookupTable(int offset, short[][] data) 67: throws IllegalArgumentException 68: { 69: super(offset, data.length); 70: this.data = data; 71: } 72: 73: /** 74: * Creates a new <code>ShortLookupTable</code> instance. 75: * 76: * Offset is subtracted from pixel values when looking up in the translation 77: * table. The same table is applied to all pixel components. 78: * 79: * @param offset Offset to be subtracted. 80: * @param data Lookup table for all components. 81: * @exception IllegalArgumentException if offset < 0. 82: */ 83: public ShortLookupTable(int offset, short[] data) 84: throws IllegalArgumentException 85: { 86: super(offset, 1); 87: this.data = new short[][] {data}; 88: } 89: 90: /** Return the lookup tables. */ 91: public final short[][] getTable() 92: { 93: return data; 94: } 95: 96: /** 97: * Return translated values for a pixel. 98: * 99: * For each value in the pixel src, use the value minus offset as an index 100: * in the component array and copy the value there to the output for the 101: * component. If dest is null, the output is a new array, otherwise the 102: * translated values are written to dest. Dest can be the same array as 103: * src. 104: * 105: * For example, if the pixel src is [2, 4, 3], and offset is 1, the output 106: * is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the 107: * translation arrays. 108: * 109: * @param src Component values of a pixel. 110: * @param dst Destination array for values, or null. 111: * @return Translated values for the pixel. 112: */ 113: public int[] lookupPixel(int[] src, int[] dst) 114: throws ArrayIndexOutOfBoundsException 115: { 116: if (dst == null) 117: dst = new int[src.length]; 118: 119: if (data.length == 1) 120: for (int i=0; i < src.length; i++) 121: dst[i] = data[0][src[i] - offset]; 122: else 123: for (int i=0; i < src.length; i++) 124: dst[i] = data[i][src[i] - offset]; 125: 126: return dst; 127: } 128: 129: /** 130: * Return translated values for a pixel. 131: * 132: * For each value in the pixel src, use the value minus offset as an index 133: * in the component array and copy the value there to the output for the 134: * component. If dest is null, the output is a new array, otherwise the 135: * translated values are written to dest. Dest can be the same array as 136: * src. 137: * 138: * For example, if the pixel src is [2, 4, 3], and offset is 1, the output 139: * is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the 140: * translation arrays. 141: * 142: * @param src Component values of a pixel. 143: * @param dst Destination array for values, or null. 144: * @return Translated values for the pixel. 145: */ 146: public short[] lookupPixel(short[] src, short[] dst) 147: throws ArrayIndexOutOfBoundsException 148: { 149: if (dst == null) 150: dst = new short[src.length]; 151: 152: if (data.length == 1) 153: for (int i=0; i < src.length; i++) 154: dst[i] = data[0][((int)src[i]) - offset]; 155: else 156: for (int i=0; i < src.length; i++) 157: dst[i] = data[i][((int)src[i]) - offset]; 158: 159: return dst; 160: 161: } 162: }
GNU Classpath (0.20) |