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-/* LookupTable.java -- Java class for a pixel translation table.
- Copyright (C) 2004, 2005 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.awt.image;
-
-/**
- * LookupTable represents translation arrays for pixel values. It wraps one
- * or more data arrays for each layer (or component) in an image, such as
- * Alpha, R, G, and B. When doing translation, the offset is subtracted from
- * the pixel values to allow a subset of an array to be used.
- *
- * @see ByteLookupTable
- * @see ShortLookupTable
- *
- * @author Jerry Quinn (jlquinn@optonline.net)
- * @version 1.0
- */
-public abstract class LookupTable
-{
- // Not protected since that's part of the public API.
- int offset;
- int numComponents;
-
- /**
- * Creates a new <code>LookupTable</code> instance.
- *
- * If numComponents is 1, the same translation table is used for all pixel
- * components.
- *
- * @param offset Offset to be subtracted.
- * @param numComponents Number of image components.
- * @exception IllegalArgumentException if offset < 0 or numComponents < 1.
- */
- protected LookupTable(int offset, int numComponents)
- throws IllegalArgumentException
- {
- if (offset < 0 || numComponents < 1)
- throw new IllegalArgumentException();
- this.offset = offset;
- this.numComponents = numComponents;
- }
-
- /** Return the number of components. */
- public int getNumComponents()
- {
- return numComponents;
- }
-
- /** Return the offset. */
- public int getOffset()
- {
- return offset;
- }
-
-
- /**
- * Return translated values for a pixel.
- *
- * For each value in the pixel src, use the value minus offset as an index
- * in the component array and copy the value there to the output for the
- * component. If dest is null, the output is a new array, otherwise the
- * translated values are written to dest. Dest can be the same array as
- * src.
- *
- * For example, if the pixel src is [2, 4, 3], and offset is 1, the output
- * is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the
- * translation arrays.
- *
- * @param src Component values of a pixel.
- * @param dest Destination array for values, or null.
- * @return Translated values for the pixel.
- */
- public abstract int[] lookupPixel(int[] src, int[] dest);
-}