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java.awt.image

public abstract Class LookupTable

extends Object
Class Inheritance
Known Direct Subclasses
java.awt.image.ShortLookupTable, java.awt.image.ByteLookupTable
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

Field Summary

Modifier and TypeField and Description
pack-priv int
numComponents

Constants

pack-priv int
numEntries

pack-priv int
offset

Constructor Summary

AccessConstructor and Description
protected
LookupTable(int
the offset to subtract from input values before indexing into the data arrays for this LookupTable
offset, int
the number of data arrays in this LookupTable
numComponents)

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

Method Summary

Modifier and TypeMethod and Description
public int

Returns:

the number of components in this LookupTable.
getNumComponents()

Returns the number of components in the lookup table.

public int

Returns:

the offset of this LookupTable.
getOffset()

Returns the offset.

public abstract int[]

Returns:

an int array of components for one pixel.
lookupPixel(int[]
the source array of components of one pixel
src, int[]
the destination array of components for one pixel, translated with this LookupTable
dest)

Returns an int array of components for one pixel.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

numComponentsback to summary
pack-priv int numComponents

Constants

numEntriesback to summary
pack-priv int numEntries
offsetback to summary
pack-priv int offset

Constructor Detail

LookupTableback to summary
protected LookupTable(int offset, int numComponents)

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

Parameters
offset:int

the offset to subtract from input values before indexing into the data arrays for this LookupTable

numComponents:int

the number of data arrays in this LookupTable

Exceptions
IllegalArgumentException:
if offset is less than 0 or if numComponents is less than 1

Method Detail

getNumComponentsback to summary
public int getNumComponents()

Returns the number of components in the lookup table.

Returns:int

the number of components in this LookupTable.

getOffsetback to summary
public int getOffset()

Returns the offset.

Returns:int

the offset of this LookupTable.

lookupPixelback to summary
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:int[]

the source array of components of one pixel

dest:int[]

the destination array of components for one pixel, translated with this LookupTable

Returns:int[]

an int array of components for one pixel.