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/* * @(#)ByteLookupTable.java 1.33 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.awt.image; /** * This class defines a lookup table object. The output of a * lookup operation using an object of this class is interpreted * as an unsigned byte quantity. The lookup table contains byte * data arrays for one or more bands (or components) of an image, * and it contains an offset which will be subtracted from the * input values before indexing 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. * * @see ShortLookupTable * @see LookupOp * @version 10 Feb 1997 */ public class ByteLookupTable extends LookupTable { /** * Constants */ byte data[][]; /** * Constructs a ByteLookupTable object from an array of byte * arrays representing a lookup table for each * band. The offset will be subtracted from input * values before indexing into the arrays. The number of * bands is the length of the data argument. The * data array for each band is stored as a reference. * @param offset the value subtracted from the input values * before indexing into the arrays * @param data an array of byte arrays representing a lookup * table for each band * @throws IllegalArgumentException if <code>offset</code> is * is less than 0 or if the length of <code>data</code> * is less than 1 */ public ByteLookupTable(int offset, byte data[][]) { super(offset,data.length); numComponents = data.length; numEntries = data[0].length; this.data = new byte[numComponents][]; // Allocate the array and copy the data reference for (int i=0; i < numComponents; i++) { this.data[i] = data[i]; } } /** * Constructs a ByteLookupTable object from an array * of bytes representing a lookup table to be applied to all * bands. The offset will be subtracted from input * values before indexing into the array. * The data array is stored as a reference. * @param offset the value subtracted from the input values * before indexing into the array * @param data an array of bytes * @throws IllegalArgumentException if <code>offset</code> is * is less than 0 or if the length of <code>data</code> * is less than 1 */ public ByteLookupTable(int offset, byte data[]) { super(offset,data.length); numComponents = 1; numEntries = data.length; this.data = new byte[1][]; this.data[0] = data; } /** * Returns the lookup table data by reference. If this ByteLookupTable * was constructed using a single byte array, the length of the returned * array is one. * @return the data array of this <code>ByteLookupTable</code>. */ public final byte[][] getTable(){ return data; } /** * Returns an array of samples of a pixel, translated with the lookup * table. The source and destination array can be the same array. * Array <code>dst</code> is returned. * * @param src the source array. * @param dst the destination array. This array must be at least as * long as <code>src</code>. If <code>dst</code> is * <code>null</code>, a new array will be allocated having the * same length as <code>src</code>. * @return the array <code>dst</code>, an <code>int</code> array of * samples. * @exception ArrayIndexOutOfBoundsException if <code>src</code> is * longer than <code>dst</code> or if for any element * <code>i</code> of <code>src</code>, * <code>src[i]-offset</code> is either less than zero or * greater than or equal to the length of the lookup table * for any band. */ public int[] lookupPixel(int[] src, int[] dst){ if (dst == null) { // Need to alloc a new destination array dst = new int[src.length]; } if (numComponents == 1) { // Apply one LUT to all bands for (int i=0; i < src.length; i++) { int s = src[i] - offset; if (s < 0) { throw new ArrayIndexOutOfBoundsException("src["+i+ "]-offset is "+ "less than zero"); } dst[i] = (int) data[0][s]; } } else { for (int i=0; i < src.length; i++) { int s = src[i] - offset; if (s < 0) { throw new ArrayIndexOutOfBoundsException("src["+i+ "]-offset is "+ "less than zero"); } dst[i] = (int) data[i][s]; } } return dst; } /** * Returns an array of samples of a pixel, translated with the lookup * table. The source and destination array can be the same array. * Array <code>dst</code> is returned. * * @param src the source array. * @param dst the destination array. This array must be at least as * long as <code>src</code>. If <code>dst</code> is * <code>null</code>, a new array will be allocated having the * same length as <code>src</code>. * @return the array <code>dst</code>, an <code>int</code> array of * samples. * @exception ArrayIndexOutOfBoundsException if <code>src</code> is * longer than <code>dst</code> or if for any element * <code>i</code> of <code>src</code>, * <code>(src[i]&0xff)-offset</code> is either less than * zero or greater than or equal to the length of the * lookup table for any band. */ public byte[] lookupPixel(byte[] src, byte[] dst){ if (dst == null) { // Need to alloc a new destination array dst = new byte[src.length]; } if (numComponents == 1) { // Apply one LUT to all bands for (int i=0; i < src.length; i++) { int s = (src[i]&0xff) - offset; if (s < 0) { throw new ArrayIndexOutOfBoundsException("src["+i+ "]-offset is "+ "less than zero"); } dst[i] = data[0][s]; } } else { for (int i=0; i < src.length; i++) { int s = (src[i]&0xff) - offset; if (s < 0) { throw new ArrayIndexOutOfBoundsException("src["+i+ "]-offset is "+ "less than zero"); } dst[i] = data[i][s]; } } return dst; } }