110 lines
3.8 KiB
Java
110 lines
3.8 KiB
Java
/* LookupTable.java -- Java class for a pixel translation table.
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Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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/**
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* LookupTable represents translation arrays for pixel values. It wraps one
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* or more data arrays for each layer (or component) in an image, such as
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* Alpha, R, G, and B. When doing translation, the offset is subtracted from
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* the pixel values to allow a subset of an array to be used.
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*
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* @see ByteLookupTable
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* @see ShortLookupTable
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*
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* @author Jerry Quinn (jlquinn@optonline.net)
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* @version 1.0
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*/
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public abstract class LookupTable
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{
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// Not protected since that's part of the public API.
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int offset;
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int numComponents;
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/**
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* Creates a new <code>LookupTable</code> instance.
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*
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* If numComponents is 1, the same translation table is used for all pixel
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* components.
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*
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* @param offset Offset to be subtracted.
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* @param numComponents Number of image components.
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* @exception IllegalArgumentException if offset < 0 or numComponents < 1.
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*/
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protected LookupTable(int offset, int numComponents)
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throws IllegalArgumentException
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{
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if (offset < 0 || numComponents < 1)
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throw new IllegalArgumentException();
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this.offset = offset;
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this.numComponents = numComponents;
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}
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/** Return the number of components. */
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public int getNumComponents()
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{
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return numComponents;
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}
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/** Return the offset. */
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public int getOffset()
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{
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return offset;
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}
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/**
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* Return translated values for a pixel.
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*
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* For each value in the pixel src, use the value minus offset as an index
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* in the component array and copy the value there to the output for the
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* component. If dest is null, the output is a new array, otherwise the
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* translated values are written to dest. Dest can be the same array as
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* src.
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*
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* For example, if the pixel src is [2, 4, 3], and offset is 1, the output
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* is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the
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* translation arrays.
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*
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* @param src Component values of a pixel.
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* @param dest Destination array for values, or null.
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* @return Translated values for the pixel.
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*/
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public abstract int[] lookupPixel(int[] src, int[] dest);
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}
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