java.awt.image: abstract public class: LookupTable

java.awt.image
abstract public class: LookupTable [javadoc | source]

java.lang.Object
   java.awt.image.LookupTable

Direct Known Subclasses:
ShortLookupTable, 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.

Also see:

ByteLookupTable

ShortLookupTable

LookupOp

Field Summary
int	numComponents	Constants
int	offset
int	numEntries

Constructor:

Constructor:
protected LookupTable(int offset, int numComponents) { if (offset < 0) { throw new IllegalArgumentException("Offset must be greater than 0"); } if (numComponents < 1) { throw new IllegalArgumentException("Number of components must "+ " be at least 1"); } this.numComponents = numComponents; this.offset = offset; } 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

 protected LookupTable(int offset,
    int numComponents) {
        if (offset <  0) {
            throw new
                IllegalArgumentException("Offset must be greater than 0");
        }
        if (numComponents <  1) {
            throw new IllegalArgumentException("Number of components must "+
                                               " be at least 1");
        }
        this.numComponents = numComponents;
        this.offset = offset;
}

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 from java.awt.image.LookupTable Summary:
getNumComponents, getOffset, lookupPixel

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from java.awt.image.LookupTable Detail:
public int getNumComponents() { return numComponents; } Returns the number of components in the lookup table.
public int getOffset() { return offset; } Returns the offset.
abstract public 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.

Method from java.awt.image.LookupTable Detail:

 public int getNumComponents() {
        return numComponents;
}

Returns the number of components in the lookup table.

 public int getOffset() {
        return offset;
}

Returns the offset.

 abstract public 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.