java.awt.image
Class LookupTable
- java.lang.Object
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- java.awt.image.LookupTable
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- 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:
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ByteLookupTable,ShortLookupTable,LookupOp
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Constructor Summary
Constructors Modifier Constructor and Description protectedLookupTable(int offset, int numComponents)Constructs a new LookupTable from the number of components and an offset into the lookup table.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method and Description intgetNumComponents()Returns the number of components in the lookup table.intgetOffset()Returns the offset.abstract int[]lookupPixel(int[] src, int[] dest)Returns anintarray of components for one pixel.
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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:
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offset- the offset to subtract from input values before indexing into the data arrays for thisLookupTable -
numComponents- the number of data arrays in thisLookupTable - Throws:
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IllegalArgumentException- ifoffsetis less than 0 or ifnumComponentsis less than 1
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Method Detail
getNumComponents
public int getNumComponents()
Returns the number of components in the lookup table.- Returns:
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the number of components in this
LookupTable.
getOffset
public int getOffset()
Returns the offset.- Returns:
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the offset of this
LookupTable.
lookupPixel
public abstract int[] lookupPixel(int[] src, int[] dest)Returns anintarray of components for one pixel. Thedestarray contains the result of the lookup and is returned. If dest isnull, a new array is allocated. The source and destination can be equal.- Parameters:
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src- the source array of components of one pixel -
dest- the destination array of components for one pixel, translated with thisLookupTable - Returns:
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an
intarray of components for one pixel.
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