| /* |
| * Copyright (c) 1997, 1999, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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 |
| */ |
| 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} 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; |
| } |
| |
| } |