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    * 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
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  package java.awt.image;
  
  import static sun.java2d.StateTrackable.State.*;
  
  /**
   * This class extends <code>DataBuffer</code> and stores data internally
   * in <code>double</code> form.
   * <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>
   *
   * @since 1.4
   */
  
  public final class DataBufferDouble extends DataBuffer {
  
      /** The array of data banks. */
      double bankdata[][];
  
      /** A reference to the default data bank. */
      double data[];
  
      /**
       * Constructs a <code>double</code>-based <code>DataBuffer</code>
       * with a specified size.
       *
       * @param size The number of elements in the <code>DataBuffer</code>.
       */
      public DataBufferDouble(int size) {
          super(STABLE, TYPE_DOUBLE, size);
          data = new double[size];
          bankdata = new double[1][];
          bankdata[0] = data;
      }
  
      /**
       * Constructs a <code>double</code>-based <code>DataBuffer</code>
       * with a specified number of banks, all of which are of a
       * specified size.
       *
       * @param size The number of elements in each bank of the
       *        <code>DataBuffer</code>.
       * @param numBanks The number of banks in the <code>DataBuffer</code>.
       */
      public DataBufferDouble(int size, int numBanks) {
          super(STABLE, TYPE_DOUBLE, size, numBanks);
          bankdata = new double[numBanks][];
          for (int i= 0; i < numBanks; i++) {
              bankdata[i] = new double[size];
          }
          data = bankdata[0];
      }
  
      /**
       * Constructs a <code>double</code>-based <code>DataBuffer</code>
       * with the specified data array.  Only the first
       * <code>size</code> elements are available for use by this
       * <code>DataBuffer</code>.  The array 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 An array of <code>double</code>s to be used as the
      *                  first and only bank of this <code>DataBuffer</code>.
      * @param size The number of elements of the array to be used.
      */
     public DataBufferDouble(double dataArray[], int size) {
         super(UNTRACKABLE, TYPE_DOUBLE, size);
         data = dataArray;
         bankdata = new double[1][];
         bankdata[0] = data;
     }
 
     /**
      * Constructs a <code>double</code>-based <code>DataBuffer</code>
      * with the specified data array.  Only the elements between
      * <code>offset</code> and <code>offset + size - 1</code> are
      * available for use by this <code>DataBuffer</code>.  The array
      * must be large enough to hold <code>offset + 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 An array of <code>double</code>s to be used as the
      *                  first and only bank of this <code>DataBuffer</code>.
      * @param size The number of elements of the array to be used.
      * @param offset The offset of the first element of the array
      *               that will be used.
      */
     public DataBufferDouble(double dataArray[], int size, int offset) {
         super(UNTRACKABLE, TYPE_DOUBLE, size, 1, offset);
         data = dataArray;
         bankdata = new double[1][];
         bankdata[0] = data;
     }
 
     /**
      * Constructs a <code>double</code>-based <code>DataBuffer</code>
      * with the specified data arrays.  Only the first
      * <code>size</code> elements of each array are available for use
      * by this <code>DataBuffer</code>.  The number of banks will be
      * equal <code>to dataArray.length</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 An array of arrays of <code>double</code>s to be
      *        used as the banks of this <code>DataBuffer</code>.
      * @param size The number of elements of each array to be used.
      */
     public DataBufferDouble(double dataArray[][], int size) {
         super(UNTRACKABLE, TYPE_DOUBLE, size, dataArray.length);
         bankdata = (double[][]) dataArray.clone();
         data = bankdata[0];
     }
 
     /**
      * Constructs a <code>double</code>-based <code>DataBuffer</code>
      * with the specified data arrays, size, and per-bank offsets.
      * The number of banks is equal to dataArray.length.  Each array
      * must be at least as large as <code>size</code> plus the
      * corresponding offset.  There must be an entry in the
      * <code>offsets</code> array for each data array.
      * <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 An array of arrays of <code>double</code>s to be
      *        used as the banks of this <code>DataBuffer</code>.
      * @param size The number of elements of each array to be used.
      * @param offsets An array of integer offsets, one for each bank.
      */
     public DataBufferDouble(double dataArray[][], int size, int offsets[]) {
         super(UNTRACKABLE, TYPE_DOUBLE, size, dataArray.length, offsets);
         bankdata = (double[][]) dataArray.clone();
         data = bankdata[0];
     }
 
     /**
      * Returns the default (first) <code>double</code> 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 double data array.
      */
     public double[] 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 data array
      * @return the data array specified by <code>bank</code>.
      */
     public double[] getData(int bank) {
         theTrackable.setUntrackable();
         return bankdata[bank];
     }
 
     /**
      * Returns the data array 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 data arrays from this data buffer.
      */
     public double[][] getBankData() {
         theTrackable.setUntrackable();
         return (double[][]) bankdata.clone();
     }
 
     /**
      * Returns the requested data array element from the first
      * (default) bank as an <code>int</code>.
      *
      * @param i The desired data array element.
      * @return The data entry as an <code>int</code>.
      * @see #setElem(int, int)
      * @see #setElem(int, int, int)
      */
     public int getElem(int i) {
         return (int)(data[i+offset]);
     }
 
     /**
      * Returns the requested data array element from the specified
      * bank as an <code>int</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      *
      * @return The data entry as an <code>int</code>.
      * @see #setElem(int, int)
      * @see #setElem(int, int, int)
      */
     public int getElem(int bank, int i) {
         return (int)(bankdata[bank][i+offsets[bank]]);
     }
 
     /**
      * Sets the requested data array element in the first (default)
      * bank to the given <code>int</code>.
      *
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElem(int)
      * @see #getElem(int, int)
      */
     public void setElem(int i, int val) {
         data[i+offset] = (double)val;
         theTrackable.markDirty();
     }
 
     /**
      * Sets the requested data array element in the specified bank
      * to the given <code>int</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElem(int)
      * @see #getElem(int, int)
      */
     public void setElem(int bank, int i, int val) {
         bankdata[bank][i+offsets[bank]] = (double)val;
         theTrackable.markDirty();
     }
 
     /**
      * Returns the requested data array element from the first
      * (default) bank as a <code>float</code>.
      *
      * @param i The desired data array element.
      *
      * @return The data entry as a <code>float</code>.
      * @see #setElemFloat(int, float)
      * @see #setElemFloat(int, int, float)
      */
     public float getElemFloat(int i) {
         return (float)data[i+offset];
     }
 
     /**
      * Returns the requested data array element from the specified
      * bank as a <code>float</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      *
      * @return The data entry as a <code>float</code>.
      * @see #setElemFloat(int, float)
      * @see #setElemFloat(int, int, float)
      */
     public float getElemFloat(int bank, int i) {
         return (float)bankdata[bank][i+offsets[bank]];
     }
 
     /**
      * Sets the requested data array element in the first (default)
      * bank to the given <code>float</code>.
      *
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElemFloat(int)
      * @see #getElemFloat(int, int)
      */
     public void setElemFloat(int i, float val) {
         data[i+offset] = (double)val;
         theTrackable.markDirty();
     }
 
     /**
      * Sets the requested data array element in the specified bank to
      * the given <code>float</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElemFloat(int)
      * @see #getElemFloat(int, int)
      */
     public void setElemFloat(int bank, int i, float val) {
         bankdata[bank][i+offsets[bank]] = (double)val;
         theTrackable.markDirty();
     }
 
     /**
      * Returns the requested data array element from the first
      * (default) bank as a <code>double</code>.
      *
      * @param i The desired data array element.
      *
      * @return The data entry as a <code>double</code>.
      * @see #setElemDouble(int, double)
      * @see #setElemDouble(int, int, double)
      */
     public double getElemDouble(int i) {
         return data[i+offset];
     }
 
     /**
      * Returns the requested data array element from the specified
      * bank as a <code>double</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      *
      * @return The data entry as a <code>double</code>.
      * @see #setElemDouble(int, double)
      * @see #setElemDouble(int, int, double)
      */
     public double getElemDouble(int bank, int i) {
         return bankdata[bank][i+offsets[bank]];
     }
 
     /**
      * Sets the requested data array element in the first (default)
      * bank to the given <code>double</code>.
      *
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElemDouble(int)
      * @see #getElemDouble(int, int)
      */
     public void setElemDouble(int i, double val) {
         data[i+offset] = val;
         theTrackable.markDirty();
     }
 
     /**
      * Sets the requested data array element in the specified bank to
      * the given <code>double</code>.
      *
      * @param bank The bank number.
      * @param i The desired data array element.
      * @param val The value to be set.
      * @see #getElemDouble(int)
      * @see #getElemDouble(int, int)
      */
     public void setElemDouble(int bank, int i, double val) {
         bankdata[bank][i+offsets[bank]] = val;
         theTrackable.markDirty();
     }
 }