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	/*
	* Copyright (c) 1997, 2008, 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.
	*/

	/* ****************************************************************
	******************************************************************
	******************************************************************
	*** COPYRIGHT (c) Eastman Kodak Company, 1997
	*** As an unpublished work pursuant to Title 17 of the United
	*** States Code. All rights reserved.
	******************************************************************
	******************************************************************
	******************************************************************/

	package java.awt.image;

	import static sun.java2d.StateTrackable.State.*;

	/**
	* This class extends <CODE>DataBuffer</CODE> and stores data internally as
	* shorts. Values stored in the short array(s) of this <CODE>DataBuffer</CODE>
	* are treated as unsigned values.
	* <p>
	* <a name="optimizations">
	* Note that some implementations may function more efficiently
	* if they can maintain control over how the data for an image is
	* stored.
	* For example, optimizations such as caching an image in video
	* memory require that the implementation track all modifications
	* to that data.
	* Other implementations may operate better if they can store the
	* data in locations other than a Java array.
	* To maintain optimum compatibility with various optimizations
	* it is best to avoid constructors and methods which expose the
	* underlying storage as a Java array as noted below in the
	* documentation for those methods.
	* </a>
	*/
	public final class DataBufferUShort extends DataBuffer
	{
	/** The default data bank. */
	short data[];

	/** All data banks */
	short bankdata[][];

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with a single bank and the
	* specified size.
	*
	* @param size The size of the <CODE>DataBuffer</CODE>.
	*/
	public DataBufferUShort(int size) {
	super(STABLE, TYPE_USHORT, size);
	data = new short[size];
	bankdata = new short[1][];
	bankdata[0] = data;
	}

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with the specified number of
	* banks, all of which are the specified size.
	*
	* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
	* @param numBanks The number of banks in the a<CODE>DataBuffer</CODE>.
	*/
	public DataBufferUShort(int size, int numBanks) {
	super(STABLE, TYPE_USHORT, size, numBanks);
	bankdata = new short[numBanks][];
	for (int i= 0; i < numBanks; i++) {
	bankdata[i] = new short[size];
	}
	data = bankdata[0];
	}

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with a single bank
	* using the specified array.
	* Only the first <CODE>size</CODE> elements should be used by accessors of
	* this <CODE>DataBuffer</CODE>. <CODE>dataArray</CODE> must be large enough to
	* hold <CODE>size</CODE> elements.
	* <p>
	* Note that {@code DataBuffer} objects created by this constructor
	* may be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @param dataArray The unsigned-short array for the <CODE>DataBuffer</CODE>.
	* @param size The size of the <CODE>DataBuffer</CODE> bank.
	*/
	public DataBufferUShort(short dataArray[], int size) {
	super(UNTRACKABLE, TYPE_USHORT, size);
	if (dataArray == null) {
	throw new NullPointerException("dataArray is null");
	}
	data = dataArray;
	bankdata = new short[1][];
	bankdata[0] = data;
	}

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with a single bank
	* using the specified array, size, and offset. <CODE>dataArray</CODE> must have at
	* least <CODE>offset</CODE> + <CODE>size</CODE> elements. Only elements
	* <CODE>offset</CODE> through <CODE>offset</CODE> + <CODE>size</CODE> - 1 should
	* be used by accessors of this <CODE>DataBuffer</CODE>.
	* <p>
	* Note that {@code DataBuffer} objects created by this constructor
	* may be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @param dataArray The unsigned-short array for the <CODE>DataBuffer</CODE>.
	* @param size The size of the <CODE>DataBuffer</CODE> bank.
	* @param offset The offset into the <CODE>dataArray</CODE>.
	*/
	public DataBufferUShort(short dataArray[], int size, int offset) {
	super(UNTRACKABLE, TYPE_USHORT, size, 1, offset);
	if (dataArray == null) {
	throw new NullPointerException("dataArray is null");
	}
	if ((size+offset) > dataArray.length) {
	throw new IllegalArgumentException("Length of dataArray is less "+
	" than size+offset.");
	}
	data = dataArray;
	bankdata = new short[1][];
	bankdata[0] = data;
	}

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with the specified arrays.
	* The number of banks will be equal to <CODE>dataArray.length</CODE>.
	* Only the first <CODE>size</CODE> elements of each array should be used by
	* accessors of this <CODE>DataBuffer</CODE>.
	* <p>
	* Note that {@code DataBuffer} objects created by this constructor
	* may be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @param dataArray The unsigned-short arrays for the <CODE>DataBuffer</CODE>.
	* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
	*/
	public DataBufferUShort(short dataArray[][], int size) {
	super(UNTRACKABLE, TYPE_USHORT, size, dataArray.length);
	if (dataArray == null) {
	throw new NullPointerException("dataArray is null");
	}
	for (int i=0; i < dataArray.length; i++) {
	if (dataArray[i] == null) {
	throw new NullPointerException("dataArray["+i+"] is null");
	}
	}

	bankdata = (short[][]) dataArray.clone();
	data = bankdata[0];
	}

	/**
	* Constructs an unsigned-short based <CODE>DataBuffer</CODE> with specified arrays,
	* size, and offsets.
	* The number of banks is equal to <CODE>dataArray.length</CODE>. Each array must
	* be at least as large as <CODE>size</CODE> + the corresponding offset. There must
	* be an entry in the offset array for each <CODE>dataArray</CODE> entry. For each
	* bank, only elements <CODE>offset</CODE> through
	* <CODE>offset</CODE> + <CODE>size</CODE> - 1 should be
	* used by accessors of this <CODE>DataBuffer</CODE>.
	* <p>
	* Note that {@code DataBuffer} objects created by this constructor
	* may be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @param dataArray The unsigned-short arrays for the <CODE>DataBuffer</CODE>.
	* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
	* @param offsets The offsets into each array.
	*/
	public DataBufferUShort(short dataArray[][], int size, int offsets[]) {
	super(UNTRACKABLE, TYPE_USHORT, size, dataArray.length, offsets);
	if (dataArray == null) {
	throw new NullPointerException("dataArray is null");
	}
	for (int i=0; i < dataArray.length; i++) {
	if (dataArray[i] == null) {
	throw new NullPointerException("dataArray["+i+"] is null");
	}
	if ((size+offsets[i]) > dataArray[i].length) {
	throw new IllegalArgumentException("Length of dataArray["+i+
	"] is less than size+"+
	"offsets["+i+"].");
	}

	}
	bankdata = (short[][]) dataArray.clone();
	data = bankdata[0];
	}

	/**
	* Returns the default (first) unsigned-short data array.
	* <p>
	* Note that calling this method may cause this {@code DataBuffer}
	* object to be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @return The first unsigned-short data array.
	*/
	public short[] getData() {
	theTrackable.setUntrackable();
	return data;
	}

	/**
	* Returns the data array for the specified bank.
	* <p>
	* Note that calling this method may cause this {@code DataBuffer}
	* object to be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @param bank The bank whose data array you want to get.
	* @return The data array for the specified bank.
	*/
	public short[] getData(int bank) {
	theTrackable.setUntrackable();
	return bankdata[bank];
	}

	/**
	* Returns the data arrays for all banks.
	* <p>
	* Note that calling this method may cause this {@code DataBuffer}
	* object to be incompatible with <a href="#optimizations">performance
	* optimizations</a> used by some implementations (such as caching
	* an associated image in video memory).
	*
	* @return All of the data arrays.
	*/
	public short[][] getBankData() {
	theTrackable.setUntrackable();
	return (short[][]) bankdata.clone();
	}

	/**
	* Returns the requested data array element from the first (default) bank.
	*
	* @param i The data array element you want to get.
	* @return The requested data array element as an integer.
	* @see #setElem(int, int)
	* @see #setElem(int, int, int)
	*/
	public int getElem(int i) {
	return (int)(data[i+offset]&0xffff);
	}

	/**
	* Returns the requested data array element from the specified bank.
	*
	* @param bank The bank from which you want to get a data array element.
	* @param i The data array element you want to get.
	* @return The requested data array element as an integer.
	* @see #setElem(int, int)
	* @see #setElem(int, int, int)
	*/
	public int getElem(int bank, int i) {
	return (int)(bankdata[bank][i+offsets[bank]]&0xffff);
	}

	/**
	* Sets the requested data array element in the first (default) bank
	* to the specified value.
	*
	* @param i The data array element you want to set.
	* @param val The integer value to which you want to set the data array element.
	* @see #getElem(int)
	* @see #getElem(int, int)
	*/
	public void setElem(int i, int val) {
	data[i+offset] = (short)(val&0xffff);
	theTrackable.markDirty();
	}

	/**
	* Sets the requested data array element in the specified bank
	* from the given integer.
	* @param bank The bank in which you want to set the data array element.
	* @param i The data array element you want to set.
	* @param val The integer value to which you want to set the specified data array element.
	* @see #getElem(int)
	* @see #getElem(int, int)
	*/
	public void setElem(int bank, int i, int val) {
	bankdata[bank][i+offsets[bank]] = (short)(val&0xffff);
	theTrackable.markDirty();
	}
	}

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