/*
* Copyright (c) 1997, 2013, 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 Also: - ShortLookupTable
- LookupOp
/**
* 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
/**
* 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.
Params: - offset – the value subtracted from the input values
before indexing into the arrays
- data – an array of byte arrays representing a lookup
table for each band
Throws: - IllegalArgumentException – if
offset is is less than 0 or if the length of data is less than 1
/**
* 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} is
* is less than 0 or if the length of {@code data}
* 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.
Params: - offset – the value subtracted from the input values
before indexing into the array
- data – an array of bytes
Throws: - IllegalArgumentException – if
offset is is less than 0 or if the length of data is less than 1
/**
* 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} is
* is less than 0 or if the length of {@code data}
* 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.
Returns: the data array of this ByteLookupTable.
/**
* 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}.
*/
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 dst is returned. Params: - src – the source array.
- dst – the destination array. This array must be at least as long as
src. If dst is null, a new array will be allocated having the same length as src.
Throws: - ArrayIndexOutOfBoundsException – if
src is longer than dst or if for any element i of src, src[i]-offset is either less than zero or greater than or equal to the length of the lookup table for any band.
Returns: the array dst, an int array of samples.
/**
* 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} is returned.
*
* @param src the source array.
* @param dst the destination array. This array must be at least as
* long as {@code src}. If {@code dst} is
* {@code null}, a new array will be allocated having the
* same length as {@code src}.
* @return the array {@code dst}, an {@code int} array of
* samples.
* @exception ArrayIndexOutOfBoundsException if {@code src} is
* longer than {@code dst} or if for any element
* {@code i} of {@code src},
* {@code src[i]-offset} 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 dst is returned. Params: - src – the source array.
- dst – the destination array. This array must be at least as long as
src. If dst is null, a new array will be allocated having the same length as src.
Throws: - ArrayIndexOutOfBoundsException – if
src is longer than dst or if for any element i of src, (src[i]&0xff)-offset is either less than zero or greater than or equal to the length of the lookup table for any band.
Returns: the array dst, an int array of samples.
/**
* 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} is returned.
*
* @param src the source array.
* @param dst the destination array. This array must be at least as
* long as {@code src}. If {@code dst} is
* {@code null}, a new array will be allocated having the
* same length as {@code src}.
* @return the array {@code dst}, an {@code int} array of
* samples.
* @exception ArrayIndexOutOfBoundsException if {@code src} is
* longer than {@code dst} or if for any element
* {@code i} of {@code src},
* {@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;
}
}