Class LookupTable
java.lang.Object
java.awt.image.LookupTable
- Direct Known Subclasses:
ByteLookupTable
,ShortLookupTable
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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Constructor Summary
ModifierConstructorDescriptionprotected
LookupTable
(int offset, int numComponents) Constructs a new LookupTable from the number of components and an offset into the lookup table. -
Method Summary
Modifier and TypeMethodDescriptionint
Returns the number of components in the lookup table.int
Returns the offset.abstract int[]
lookupPixel
(int[] src, int[] dest) Returns anint
array of components for one pixel.
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Constructor Details
-
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 thisLookupTable
numComponents
- the number of data arrays in thisLookupTable
- Throws:
IllegalArgumentException
- ifoffset
is less than 0 or ifnumComponents
is less than 1
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Method Details
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getNumComponents
public int getNumComponents()Returns the number of components in the lookup table.- Returns:
- the number of components in this
LookupTable
.
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getOffset
public int getOffset()Returns the offset.- Returns:
- the offset of this
LookupTable
.
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lookupPixel
public abstract int[] lookupPixel(int[] src, int[] dest) Returns anint
array of components for one pixel. Thedest
array 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:
src
- the source array of components of one pixeldest
- the destination array of components for one pixel, translated with thisLookupTable
- Returns:
- an
int
array of components for one pixel.
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