DataBufferDouble (Java SE 26 & JDK 26)
Description: declaration: module: java.desktop, package: java.awt.image, class: DataBufferDouble
Keywords: java.awt.image.DataBufferDouble class

# Class DataBufferDouble

java.lang.Object
java.awt.image.DataBuffer
java.awt.image.DataBufferDouble

public final class DataBufferDouble extends DataBuffer
This class extends `DataBuffer` and stores data internally in `double` form.

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.

Since:
  1.4

- ## Field Summary

  ### Fields declared in class DataBuffer

  `banks, dataType, offset, offsets, size, TYPE_BYTE, TYPE_DOUBLE, TYPE_FLOAT, TYPE_INT, TYPE_SHORT, TYPE_UNDEFINED, TYPE_USHORT`
  Modifier and Type
  Field
  Description
  `protected int`
  `banks`
  The number of banks in this DataBuffer.
  `protected int`
  `dataType`
  The data type of this DataBuffer.
  `protected int`
  `offset`
  Offset into default (first) bank from which to get the first element.
  `protected int[]`
  `offsets`
  Offsets into all banks.
  `protected int`
  `size`
  Usable size of all banks.
  `static final int`
  `TYPE_BYTE`
  Tag for unsigned byte data.
  `static final int`
  `TYPE_DOUBLE`
  Tag for double data.
  `static final int`
  `TYPE_FLOAT`
  Tag for float data.
  `static final int`
  `TYPE_INT`
  Tag for int data.
  `static final int`
  `TYPE_SHORT`
  Tag for signed short data.
  `static final int`
  `TYPE_UNDEFINED`
  Tag for undefined data.
  `static final int`
  `TYPE_USHORT`
  Tag for unsigned short data.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `DataBufferDouble(double[][] dataArray, int size)`
  Constructs a `double`-based `DataBuffer` with the specified data arrays.
  `DataBufferDouble(double[][] dataArray, int size, int[] offsets)`
  Constructs a `double`-based `DataBuffer` with the specified data arrays, size, and per-bank offsets.
  `DataBufferDouble(double[] dataArray, int size)`
  Constructs a `double`-based `DataBuffer` with the specified data array.
  `DataBufferDouble(double[] dataArray, int size, int offset)`
  Constructs a `double`-based `DataBuffer` with the specified data array.
  `DataBufferDouble(int size)`
  Constructs a `double`-based `DataBuffer` with a specified size.
  `DataBufferDouble(int size, int numBanks)`
  Constructs a `double`-based `DataBuffer` with a specified number of banks, all of which are of a specified size.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `double[][]`
  `getBankData()`
  Returns the data array for all banks.
  `double[]`
  `getData()`
  Returns the default (first) `double` data array.
  `double[]`
  `getData(int bank)`
  Returns the data array for the specified bank.
  `int`
  `getElem(int i)`
  Returns the requested data array element from the first (default) bank as an `int`.
  `int`
  `getElem(int bank, int i)`
  Returns the requested data array element from the specified bank as an `int`.
  `double`
  `getElemDouble(int i)`
  Returns the requested data array element from the first (default) bank as a `double`.
  `double`
  `getElemDouble(int bank, int i)`
  Returns the requested data array element from the specified bank as a `double`.
  `float`
  `getElemFloat(int i)`
  Returns the requested data array element from the first (default) bank as a `float`.
  `float`
  `getElemFloat(int bank, int i)`
  Returns the requested data array element from the specified bank as a `float`.
  `void`
  `setElem(int i, int val)`
  Sets the requested data array element in the first (default) bank to the given `int`.
  `void`
  `setElem(int bank, int i, int val)`
  Sets the requested data array element in the specified bank to the given `int`.
  `void`
  `setElemDouble(int i, double val)`
  Sets the requested data array element in the first (default) bank to the given `double`.
  `void`
  `setElemDouble(int bank, int i, double val)`
  Sets the requested data array element in the specified bank to the given `double`.
  `void`
  `setElemFloat(int i, float val)`
  Sets the requested data array element in the first (default) bank to the given `float`.
  `void`
  `setElemFloat(int bank, int i, float val)`
  Sets the requested data array element in the specified bank to the given `float`.

  ### Methods declared in class DataBuffer

  `getDataType, getDataTypeSize, getNumBanks, getOffset, getOffsets, getSize`
  Modifier and Type
  Method
  Description
  `int`
  `getDataType()`
  Returns the data type of this DataBuffer.
  `static int`
  `getDataTypeSize(int type)`
  Returns the size (in bits) of the data type, given a datatype tag.
  `int`
  `getNumBanks()`
  Returns the number of banks in this DataBuffer.
  `int`
  `getOffset()`
  Returns the offset of the default bank in array elements.
  `int[]`
  `getOffsets()`
  Returns the offsets (in array elements) of all the banks.
  `int`
  `getSize()`
  Returns the size (in array elements) of all banks.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
  Modifier and Type
  Method
  Description
  `protected Object`
  `clone()`
  Creates and returns a copy of this object.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `protected void`
  `finalize()`
  Deprecated, for removal: This API element is subject to removal in a future version.
  Finalization is deprecated and subject to removal in a future release.
  `final Class<?>`
  `getClass()`
  Returns the runtime class of this `Object`.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `final void`
  `notify()`
  Wakes up a single thread that is waiting on this object's monitor.
  `final void`
  `notifyAll()`
  Wakes up all threads that are waiting on this object's monitor.
  `String`
  `toString()`
  Returns a string representation of the object.
  `final void`
  `wait()`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
  `final void`
  `wait(long timeoutMillis)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
  `final void`
  `wait(long timeoutMillis, int nanos)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

- ## Constructor Details

  - ### DataBufferDouble

    public DataBufferDouble(int size)
    Constructs a `double`-based `DataBuffer` with a specified size.
    Parameters:
      `size` - The number of elements in the `DataBuffer`.

  - ### DataBufferDouble

    public DataBufferDouble(int size, int numBanks)
    Constructs a `double`-based `DataBuffer` with a specified number of banks, all of which are of a specified size.
    Parameters:
      `size` - The number of elements in each bank of the `DataBuffer`.
      `numBanks` - The number of banks in the `DataBuffer`.

  - ### DataBufferDouble

    public DataBufferDouble(double[] dataArray, int size)
    Constructs a `double`-based `DataBuffer` with the specified data array. Only the first `size` elements are available for use by this `DataBuffer`. The array must be large enough to hold `size` elements.

    Note that `DataBuffer` objects created by this constructor may be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Parameters:
      `dataArray` - An array of `double`s to be used as the first and only bank of this `DataBuffer`.
      `size` - The number of elements of the array to be used.

  - ### DataBufferDouble

    public DataBufferDouble(double[] dataArray, int size, int offset)
    Constructs a `double`-based `DataBuffer` with the specified data array. Only the elements between `offset` and `offset + size - 1` are available for use by this `DataBuffer`. The array must be large enough to hold `offset + size` elements.

    Note that `DataBuffer` objects created by this constructor may be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Parameters:
      `dataArray` - An array of `double`s to be used as the first and only bank of this `DataBuffer`.
      `size` - The number of elements of the array to be used.
      `offset` - The offset of the first element of the array that will be used.

  - ### DataBufferDouble

    public DataBufferDouble(double[][] dataArray, int size)
    Constructs a `double`-based `DataBuffer` with the specified data arrays. Only the first `size` elements of each array are available for use by this `DataBuffer`. The number of banks will be equal `to dataArray.length`.

    Note that `DataBuffer` objects created by this constructor may be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Parameters:
      `dataArray` - An array of arrays of `double`s to be used as the banks of this `DataBuffer`.
      `size` - The number of elements of each array to be used.

  - ### DataBufferDouble

    public DataBufferDouble(double[][] dataArray, int size, int[] offsets)
    Constructs a `double`-based `DataBuffer` 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 `size` plus the corresponding offset. There must be an entry in the `offsets` array for each data array.

    Note that `DataBuffer` objects created by this constructor may be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Parameters:
      `dataArray` - An array of arrays of `double`s to be used as the banks of this `DataBuffer`.
      `size` - The number of elements of each array to be used.
      `offsets` - An array of integer offsets, one for each bank.

- ## Method Details

  - ### getData

    public double[] getData()
    Returns the default (first) `double` data array.

    Note that calling this method may cause this `DataBuffer` object to be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Returns:
      the first double data array.

  - ### getData

    public double[] getData(int bank)
    Returns the data array for the specified bank.

    Note that calling this method may cause this `DataBuffer` object to be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Parameters:
      `bank` - the data array
    Returns:
      the data array specified by `bank`.

  - ### getBankData

    public double[][] getBankData()
    Returns the data array for all banks.

    Note that calling this method may cause this `DataBuffer` object to be incompatible with performance optimizations used by some implementations (such as caching an associated image in video memory).

    Returns:
      all data arrays from this data buffer.

  - ### getElem

    public int getElem(int i)
    Returns the requested data array element from the first (default) bank as an `int`.
    Overrides:
      `getElem` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
    Returns:
      The data entry as an `int`.
    See Also:
      - `setElem(int, int)`
      - `setElem(int, int, int)`

  - ### getElem

    public int getElem(int bank, int i)
    Returns the requested data array element from the specified bank as an `int`.
    Specified by:
      `getElem` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
    Returns:
      The data entry as an `int`.
    See Also:
      - `setElem(int, int)`
      - `setElem(int, int, int)`

  - ### setElem

    public void setElem(int i, int val)
    Sets the requested data array element in the first (default) bank to the given `int`.
    Overrides:
      `setElem` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElem(int)`
      - `getElem(int, int)`

  - ### setElem

    public void setElem(int bank, int i, int val)
    Sets the requested data array element in the specified bank to the given `int`.
    Specified by:
      `setElem` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElem(int)`
      - `getElem(int, int)`

  - ### getElemFloat

    public float getElemFloat(int i)
    Returns the requested data array element from the first (default) bank as a `float`.
    Overrides:
      `getElemFloat` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
    Returns:
      The data entry as a `float`.
    See Also:
      - `setElemFloat(int, float)`
      - `setElemFloat(int, int, float)`

  - ### getElemFloat

    public float getElemFloat(int bank, int i)
    Returns the requested data array element from the specified bank as a `float`.
    Overrides:
      `getElemFloat` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
    Returns:
      The data entry as a `float`.
    See Also:
      - `setElemFloat(int, float)`
      - `setElemFloat(int, int, float)`

  - ### setElemFloat

    public void setElemFloat(int i, float val)
    Sets the requested data array element in the first (default) bank to the given `float`.
    Overrides:
      `setElemFloat` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElemFloat(int)`
      - `getElemFloat(int, int)`

  - ### setElemFloat

    public void setElemFloat(int bank, int i, float val)
    Sets the requested data array element in the specified bank to the given `float`.
    Overrides:
      `setElemFloat` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElemFloat(int)`
      - `getElemFloat(int, int)`

  - ### getElemDouble

    public double getElemDouble(int i)
    Returns the requested data array element from the first (default) bank as a `double`.
    Overrides:
      `getElemDouble` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
    Returns:
      The data entry as a `double`.
    See Also:
      - `setElemDouble(int, double)`
      - `setElemDouble(int, int, double)`

  - ### getElemDouble

    public double getElemDouble(int bank, int i)
    Returns the requested data array element from the specified bank as a `double`.
    Overrides:
      `getElemDouble` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
    Returns:
      The data entry as a `double`.
    See Also:
      - `setElemDouble(int, double)`
      - `setElemDouble(int, int, double)`

  - ### setElemDouble

    public void setElemDouble(int i, double val)
    Sets the requested data array element in the first (default) bank to the given `double`.
    Overrides:
      `setElemDouble` in class `DataBuffer`
    Parameters:
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElemDouble(int)`
      - `getElemDouble(int, int)`

  - ### setElemDouble

    public void setElemDouble(int bank, int i, double val)
    Sets the requested data array element in the specified bank to the given `double`.
    Overrides:
      `setElemDouble` in class `DataBuffer`
    Parameters:
      `bank` - The bank number.
      `i` - The desired data array element.
      `val` - The value to be set.
    See Also:
      - `getElemDouble(int)`
      - `getElemDouble(int, int)`