ojluni/src/main/java/java/awt/image/ShortLookupTable.java - platform/libcore.git - Git at Google

 /*
  * Copyright (c) 1997, 2000, 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 short quantity.  The lookup table contains short
  * 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 ByteLookupTable
  * @see LookupOp
  */
 public class ShortLookupTable extends LookupTable {

     /**
      * Constants
      */

     short data[][];

     /**
      * Constructs a ShortLookupTable object from an array of short
      * arrays representing a lookup table for each
      * band.  The offset will be subtracted from the 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 short arrays representing a lookup
      *        table for each band
      */
     public ShortLookupTable(int offset, short data[][]) {
         super(offset,data.length);
         numComponents = data.length;
         numEntries    = data[0].length;
         this.data = new short[numComponents][];
         // Allocate the array and copy the data reference
         for (int i=0; i < numComponents; i++) {
             this.data[i] = data[i];
         }
     }

     /**
      * Constructs a ShortLookupTable object from an array
      * of shorts representing a lookup table for each
      * band.  The offset will be subtracted from the 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 arrays
      * @param data an array of shorts
      */
     public ShortLookupTable(int offset, short data[]) {
         super(offset,data.length);
         numComponents = 1;
         numEntries    = data.length;
         this.data     = new short[1][];
         this.data[0]  = data;
     }

     /**
      * Returns the lookup table data by reference.  If this ShortLookupTable
      * was constructed using a single short array, the length of the returned
      * array is one.
      * @return ShortLookupTable data array.
      */
     public final short[][] 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]&0xffff)-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 channels
             for (int i=0; i < src.length; i++) {
                 int s = (src[i]&0xffff) - 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]&0xffff) - 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]&0xffff)-offset</code> is either less than
      *            zero or greater than or equal to the length of the
      *            lookup table for any band.
      */
     public short[] lookupPixel(short[] src, short[] dst){
         if (dst == null) {
             // Need to alloc a new destination array
             dst = new short[src.length];
         }

         if (numComponents == 1) {
             // Apply one LUT to all channels
             for (int i=0; i < src.length; i++) {
                 int s = (src[i]&0xffff) - 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]&0xffff) - offset;
                 if (s < 0) {
                     throw new ArrayIndexOutOfBoundsException("src["+i+
                                                              "]-offset is "+
                                                              "less than zero");
                 }
                 dst[i] = data[i][s];
             }
         }
         return dst;
     }

 }
	/*
	* Copyright (c) 1997, 2000, 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 short quantity. The lookup table contains short
	* 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 ByteLookupTable
	* @see LookupOp
	*/
	public class ShortLookupTable extends LookupTable {

	/**
	* Constants
	*/

	short data[][];

	/**
	* Constructs a ShortLookupTable object from an array of short
	* arrays representing a lookup table for each
	* band. The offset will be subtracted from the 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 short arrays representing a lookup
	* table for each band
	*/
	public ShortLookupTable(int offset, short data[][]) {
	super(offset,data.length);
	numComponents = data.length;
	numEntries = data[0].length;
	this.data = new short[numComponents][];
	// Allocate the array and copy the data reference
	for (int i=0; i < numComponents; i++) {
	this.data[i] = data[i];
	}
	}

	/**
	* Constructs a ShortLookupTable object from an array
	* of shorts representing a lookup table for each
	* band. The offset will be subtracted from the 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 arrays
	* @param data an array of shorts
	*/
	public ShortLookupTable(int offset, short data[]) {
	super(offset,data.length);
	numComponents = 1;
	numEntries = data.length;
	this.data = new short[1][];
	this.data[0] = data;
	}

	/**
	* Returns the lookup table data by reference. If this ShortLookupTable
	* was constructed using a single short array, the length of the returned
	* array is one.
	* @return ShortLookupTable data array.
	*/
	public final short[][] 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]&0xffff)-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 channels
	for (int i=0; i < src.length; i++) {
	int s = (src[i]&0xffff) - 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]&0xffff) - 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]&0xffff)-offset</code> is either less than
	* zero or greater than or equal to the length of the
	* lookup table for any band.
	*/
	public short[] lookupPixel(short[] src, short[] dst){
	if (dst == null) {
	// Need to alloc a new destination array
	dst = new short[src.length];
	}

	if (numComponents == 1) {
	// Apply one LUT to all channels
	for (int i=0; i < src.length; i++) {
	int s = (src[i]&0xffff) - 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]&0xffff) - offset;
	if (s < 0) {
	throw new ArrayIndexOutOfBoundsException("src["+i+
	"]-offset is "+
	"less than zero");
	}
	dst[i] = data[i][s];
	}
	}
	return dst;
	}

	}