J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.awt.image; |
| 27 | |
| 28 | |
| 29 | /** |
| 30 | * This abstract class defines a lookup table object. ByteLookupTable |
| 31 | * and ShortLookupTable are subclasses, which |
| 32 | * contain byte and short data, respectively. A lookup table |
| 33 | * contains data arrays for one or more bands (or components) of an image |
| 34 | * (for example, separate arrays for R, G, and B), |
| 35 | * and it contains an offset which will be subtracted from the |
| 36 | * input values before indexing into the arrays. This allows an array |
| 37 | * smaller than the native data size to be provided for a |
| 38 | * constrained input. If there is only one array in the lookup |
| 39 | * table, it will be applied to all bands. All arrays must be the |
| 40 | * same size. |
| 41 | * |
| 42 | * @see ByteLookupTable |
| 43 | * @see ShortLookupTable |
| 44 | * @see LookupOp |
| 45 | */ |
| 46 | public abstract class LookupTable extends Object{ |
| 47 | |
| 48 | /** |
| 49 | * Constants |
| 50 | */ |
| 51 | |
| 52 | int numComponents; |
| 53 | int offset; |
| 54 | int numEntries; |
| 55 | |
| 56 | /** |
| 57 | * Constructs a new LookupTable from the number of components and an offset |
| 58 | * into the lookup table. |
| 59 | * @param offset the offset to subtract from input values before indexing |
| 60 | * into the data arrays for this <code>LookupTable</code> |
| 61 | * @param numComponents the number of data arrays in this |
| 62 | * <code>LookupTable</code> |
| 63 | * @throws IllegalArgumentException if <code>offset</code> is less than 0 |
| 64 | * or if <code>numComponents</code> is less than 1 |
| 65 | */ |
| 66 | protected LookupTable(int offset, int numComponents) { |
| 67 | if (offset < 0) { |
| 68 | throw new |
| 69 | IllegalArgumentException("Offset must be greater than 0"); |
| 70 | } |
| 71 | if (numComponents < 1) { |
| 72 | throw new IllegalArgumentException("Number of components must "+ |
| 73 | " be at least 1"); |
| 74 | } |
| 75 | this.numComponents = numComponents; |
| 76 | this.offset = offset; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Returns the number of components in the lookup table. |
| 81 | * @return the number of components in this <code>LookupTable</code>. |
| 82 | */ |
| 83 | public int getNumComponents() { |
| 84 | return numComponents; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Returns the offset. |
| 89 | * @return the offset of this <code>LookupTable</code>. |
| 90 | */ |
| 91 | public int getOffset() { |
| 92 | return offset; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Returns an <code>int</code> array of components for |
| 97 | * one pixel. The <code>dest</code> array contains the |
| 98 | * result of the lookup and is returned. If dest is |
| 99 | * <code>null</code>, a new array is allocated. The |
| 100 | * source and destination can be equal. |
| 101 | * @param src the source array of components of one pixel |
| 102 | * @param dest the destination array of components for one pixel, |
| 103 | * translated with this <code>LookupTable</code> |
| 104 | * @return an <code>int</code> array of components for one |
| 105 | * pixel. |
| 106 | */ |
| 107 | public abstract int[] lookupPixel(int[] src, int[] dest); |
| 108 | |
| 109 | } |