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Java Platform 1.2
Beta 4

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Class java.awt.image.ShortLookupTable

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

public class ShortLookupTable

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 short 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:

ByteLookupTable, LookupOp

Constructor Summary

ShortLookupTable(int offset, short[] data)
Constructs a ShortLookupTable object from an array of shorts representing a lookup table for each band.

ShortLookupTable(int offset, short[][] data)
Constructs a ShortLookupTable object from an array of short arrays representing a lookup table for each band.

Method Summary

short[][]	getTable() Returns the lookup table data by reference.
int[]	lookupPixel(int[] src, int[] dst) Returns an array of samples of a pixel, translated with the lookup table.
short[]	lookupPixel(short[] src, short[] 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

ShortLookupTable

public ShortLookupTable(int offset,
                        short[][] data)

Constructs a ShortLookupTable object from an array of short arrays representing a lookup table for each band. The offset will be subtracted from the 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.

ShortLookupTable

public ShortLookupTable(int offset,
                        short[] data)

Constructs a ShortLookupTable object from an array of shorts representing a lookup table for each band. The offset will be subtracted from the input values before indexing into the array. The data array is stored as a reference.

Method Detail

getTable

public final short[][] getTable()

Returns the lookup table data by reference. If this ShortLookupTable was constructed using a single short array, the length of the returned array is one.

Returns:

ShortLookupTable 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 short[] lookupPixel(short[] src,
                           short[] 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 short data is interpreted as unsigned data so it will be ANDed with 0xffff before it is used to index into the lookup table.

Returns:

a short array of samples.