JDK8/Java8源码在线阅读

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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/* ****************************************************************
 ******************************************************************
 ******************************************************************
 *** 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 *** As  an unpublished  work pursuant to Title 17 of the United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.

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