Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class LookupTable - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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java.awt.image
Class LookupTable

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

Direct Known Subclasses:: ByteLookupTable, ShortLookupTable

public abstract class LookupTable
extends Object

This abstract class defines a lookup table object. ByteLookupTable and ShortLookupTable are subclasses, which contain byte and short data, respectively. A lookup table contains data arrays for one or more bands (or components) of an image (for example, separate arrays for R, G, and B), and it contains an offset which will be subtracted from the input values before indexing into 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. All arrays must be the same size.

See Also:: ByteLookupTable, ShortLookupTable, LookupOp

Constructor Summary

protected LookupTable(int offset, int numComponents)
          Constructs a new LookupTable from the number of components and an offset into the lookup table.

Method Summary

int getNumComponents()
          Returns the number of components in the lookup table.

int getOffset()
          Returns the offset.

abstract int[] lookupPixel(int[] src, int[] dest)
          Returns an int array of components for one pixel.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LookupTable

protected LookupTable(int offset,
                      int numComponents)

Constructs a new LookupTable from the number of components and an offset into the lookup table.

Parameters:: offset - the offset to subtract from input values before indexing into the data arrays for this LookupTable; numComponents - the number of data arrays in this LookupTable
Throws:: IllegalArgumentException - if offset is less than 0 or if numComponents is less than 1

Method Detail

getNumComponents

public int getNumComponents()

Returns the number of components in the lookup table.

getOffset

public int getOffset()

Returns the offset.

lookupPixel

public abstract int[] lookupPixel(int[] src,
                                  int[] dest)

Returns an int array of components for one pixel. Source and destination may be equal. The dest array is returned. If dest is null, a new array will be allocated.