| /* |
| * Copyright (c) 1997, 2000, 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 |
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| * questions. |
| */ |
| |
| package java.awt.image; |
| |
| |
| /** |
| * This abstract class defines a lookup table object. ByteLookupTable |
| * and ShortLookupTable are subclasses, which |
| * contain byte and short data, respectively. A lookup table |
| * contains data arrays for one or more bands (or components) of an image |
| * (for example, separate arrays for R, G, and B), |
| * and it contains an offset which will be subtracted from the |
| * input values before indexing into the arrays. This allows an array |
| * smaller than the native data size to be provided for a |
| * constrained input. If there is only one array in the lookup |
| * table, it will be applied to all bands. All arrays must be the |
| * same size. |
| * |
| * @see ByteLookupTable |
| * @see ShortLookupTable |
| * @see LookupOp |
| */ |
| public abstract class LookupTable extends Object{ |
| |
| /** |
| * Constants |
| */ |
| |
| int numComponents; |
| int offset; |
| int numEntries; |
| |
| /** |
| * Constructs a new LookupTable from the number of components and an offset |
| * into the lookup table. |
| * @param offset the offset to subtract from input values before indexing |
| * into the data arrays for this <code>LookupTable</code> |
| * @param numComponents the number of data arrays in this |
| * <code>LookupTable</code> |
| * @throws IllegalArgumentException if <code>offset</code> is less than 0 |
| * or if <code>numComponents</code> is less than 1 |
| */ |
| protected LookupTable(int offset, int numComponents) { |
| if (offset < 0) { |
| throw new |
| IllegalArgumentException("Offset must be greater than 0"); |
| } |
| if (numComponents < 1) { |
| throw new IllegalArgumentException("Number of components must "+ |
| " be at least 1"); |
| } |
| this.numComponents = numComponents; |
| this.offset = offset; |
| } |
| |
| /** |
| * Returns the number of components in the lookup table. |
| * @return the number of components in this <code>LookupTable</code>. |
| */ |
| public int getNumComponents() { |
| return numComponents; |
| } |
| |
| /** |
| * Returns the offset. |
| * @return the offset of this <code>LookupTable</code>. |
| */ |
| public int getOffset() { |
| return offset; |
| } |
| |
| /** |
| * Returns an <code>int</code> array of components for |
| * one pixel. The <code>dest</code> array contains the |
| * result of the lookup and is returned. If dest is |
| * <code>null</code>, a new array is allocated. The |
| * source and destination can be equal. |
| * @param src the source array of components of one pixel |
| * @param dest the destination array of components for one pixel, |
| * translated with this <code>LookupTable</code> |
| * @return an <code>int</code> array of components for one |
| * pixel. |
| */ |
| public abstract int[] lookupPixel(int[] src, int[] dest); |
| |
| } |