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178 lines
6.2 KiB
Java
178 lines
6.2 KiB
Java
/* ShortLookupTable.java -- Java class for a pixel translation table.
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Copyright (C) 2004, 2005, 2006, 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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* ShortLookupTable represents translation arrays for pixel values. It wraps
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* one 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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* @author Jerry Quinn (jlquinn@optonline.net)
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* @version 1.0
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*/
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public class ShortLookupTable extends LookupTable
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{
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// Array of translation tables.
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private short data[][];
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/**
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* Creates a new <code>ShortLookupTable</code> instance.
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*
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* Offset is subtracted from pixel values when looking up in the translation
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* tables. If data.length is one, the same table is applied to 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 data Array of lookup tables.
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* @exception IllegalArgumentException if offset < 0 or data.length < 1.
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*/
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public ShortLookupTable(int offset, short[][] data)
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throws IllegalArgumentException
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{
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super(offset, data.length);
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// tests show that Sun's implementation creates a new array to store the
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// references from the incoming 'data' array - not sure why, but we'll
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// match that behaviour just in case it matters...
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this.data = new short[data.length][];
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for (int i = 0; i < data.length; i++)
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this.data[i] = data[i];
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}
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/**
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* Creates a new <code>ShortLookupTable</code> instance.
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*
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* Offset is subtracted from pixel values when looking up in the translation
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* table. The same table is applied to all pixel components.
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*
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* @param offset Offset to be subtracted.
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* @param data Lookup table for all components (<code>null</code> not
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* permitted).
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* @exception IllegalArgumentException if offset < 0.
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*/
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public ShortLookupTable(int offset, short[] data)
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throws IllegalArgumentException
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{
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super(offset, 1);
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if (data == null)
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throw new NullPointerException("Null 'data' argument.");
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this.data = new short[][] {data};
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}
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/**
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* Return the lookup tables. This is a reference to the actual table, so
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* modifying the contents of the returned array will modify the lookup table.
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*
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* @return The lookup table.
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*/
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public final short[][] getTable()
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{
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return data;
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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 dst 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 int[] lookupPixel(int[] src, int[] dst)
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throws ArrayIndexOutOfBoundsException
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{
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if (dst == null)
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dst = new int[src.length];
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if (data.length == 1)
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for (int i = 0; i < src.length; i++)
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dst[i] = data[0][src[i] - offset];
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else
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for (int i = 0; i < src.length; i++)
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dst[i] = data[i][src[i] - offset];
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return dst;
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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 dst Destination array for values, or null.
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* @return Translated values for the pixel.
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*
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*/
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public short[] lookupPixel(short[] src, short[] dst)
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throws ArrayIndexOutOfBoundsException
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{
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if (dst == null)
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dst = new short[src.length];
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if (data.length == 1)
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for (int i = 0; i < src.length; i++)
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dst[i] = data[0][((int) src[i]) - offset];
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else
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for (int i = 0; i < src.length; i++)
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dst[i] = data[i][((int) src[i]) - offset];
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return dst;
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}
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}
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