Java Platform 1.2
Beta 4

Class java.awt.image.ByteLookupTable

java.lang.Object
  |
  +--java.awt.image.LookupTable
        |
        +--java.awt.image.ByteLookupTable

public class ByteLookupTable
extends LookupTable
This class defines a lookup table object. The output of a lookup operation using an object of this class is interpreted as an unsigned byte quantity. The lookup table contains byte 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 Also:
ShortLookupTable, LookupOp

Constructor Summary
ByteLookupTable(int offset, byte[] data)
          Constructs a ByteLookupTable object from an array of bytes representing a lookup table for each band.
ByteLookupTable(int offset, byte[][] data)
          Constructs a ByteLookupTable object from an array of byte arrays representing a lookup table for each band.
 
Method Summary
 byte[][] getTable()
          Returns the lookup table data by reference.
 byte[] lookupPixel(byte[] src, byte[] dst)
          Returns an array of samples of a pixel, translated with the lookup table.
 int[] lookupPixel(int[] src, int[] dst)
          Returns an array of samples of a pixel, translated with the lookup table.
 
Methods inherited from class java.awt.image.LookupTable
getNumComponents , getOffset
 
Methods inherited from class java.lang.Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait
 

Constructor Detail

ByteLookupTable

public ByteLookupTable(int offset,
                       byte[][] data)
Constructs a ByteLookupTable object from an array of byte arrays representing a lookup table for each band. The offset will be subtracted from 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.

ByteLookupTable

public ByteLookupTable(int offset,
                       byte[] data)
Constructs a ByteLookupTable object from an array of bytes representing a lookup table for each band. The offset will be subtracted from input values before indexing into the array. The data array is stored as a reference.
Method Detail

getTable

public final byte[][] getTable()
Returns the lookup table data by reference. If this ByteLookupTable was constructed using a single byte array, the length of the returned array is one.
Returns:
ByteLookupTable data array.

lookupPixel

public int[] lookupPixel(int[] src,
                         int[] dst)
Returns an array of samples of a pixel, translated with the lookup table. The source and destination arrays can be the same. The dst array is returned. If dst is null, a new array will be allocated.
Returns:
an int array of samples.
Overrides:
lookupPixel in class LookupTable

lookupPixel

public byte[] lookupPixel(byte[] src,
                          byte[] dst)
Returns an array of samples of a pixel, translated with the lookup table. The source and destination arrays can be the same. The dst array is returned. If dst is null, a new array will be allocated. The source byte data is interpreted to as unsigned data so it will be ANDed with 0xff before it is used to index into the lookup table.
Returns:
a byte array of samples.

Java Platform 1.2
Beta 4

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