JavaTM 2 Platform
Standard Ed. 5.0

java.awt.image
Class LookupTable

java.lang.Object
  extended by 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.

Returns:
the number of components in this LookupTable.

getOffset

public int getOffset()
Returns the offset.

Returns:
the offset of this LookupTable.

lookupPixel

public abstract int[] lookupPixel(int[] src,
                                  int[] dest)
Returns an int array of components for one pixel. The dest array contains the result of the lookup and is returned. If dest is null, a new array is allocated. The source and destination can be equal.

Parameters:
src - the source array of components of one pixel
dest - the destination array of components for one pixel, translated with this LookupTable
Returns:
an int array of components for one pixel.

JavaTM 2 Platform
Standard Ed. 5.0

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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