java.awt.image

Class BandCombineOp

public class BandCombineOp extends Object implements RasterOp

Filter Raster pixels by applying a matrix. BandCombineOp applies a matrix to each pixel to produce new pixel values. The width of the matrix must be the same or one more than the number of bands in the source Raster. If one more, the pixels in the source are assumed to contain an implicit 1.0 at the end. The rows of the matrix are multiplied by the pixel to produce the values for the destination. Therefore the destination Raster must contain the same number of bands as the number of rows in the filter matrix. This Op assumes that samples are integers; floating point sample types will be rounded to their nearest integer value during filtering.

Constructor Summary
	BandCombineOp(float[][] matrix, RenderingHints hints) Construct a BandCombineOp.

Method Summary
WritableRaster	createCompatibleDestRaster(Raster src) Creates a new WritableRaster that can be used as the destination for this Op.
WritableRaster	filter(Raster src, WritableRaster dest) Filter Raster pixels through a matrix.
Rectangle2D	getBounds2D(Raster src)
float[][]	getMatrix() Return the matrix used in this operation.
Point2D	getPoint2D(Point2D src, Point2D dst) Return corresponding destination point for source point.
RenderingHints	getRenderingHints()

Constructor Detail

BandCombineOp

public BandCombineOp(float[][] matrix, RenderingHints hints)

Construct a BandCombineOp.

Parameters: matrix The matrix to filter pixels with. hints Rendering hints to apply. Ignored.

Throws: ArrayIndexOutOfBoundsException if the matrix is invalid

Method Detail

createCompatibleDestRaster

public WritableRaster createCompatibleDestRaster(Raster src)

Creates a new WritableRaster that can be used as the destination for this Op. The number of bands in the source raster must equal the number of rows in the op matrix, which must also be equal to either the number of columns or (columns - 1) in the matrix.

Parameters: src The source raster.

Returns: A compatible raster.

Throws: IllegalArgumentException if the raster is incompatible with the matrix.

filter

public WritableRaster filter(Raster src, WritableRaster dest)

Filter Raster pixels through a matrix. Applies the Op matrix to source pixes to produce dest pixels. Each row of the matrix is multiplied by the src pixel components to produce the dest pixel. If matrix is one more than the number of bands in the src, the last element is implicitly multiplied by 1, i.e. added to the sum for that dest component. If dest is null, a suitable Raster is created. This implementation uses createCompatibleDestRaster.

Parameters: src The source Raster. dest The destination Raster, or null.

Returns: The filtered Raster.

Throws: IllegalArgumentException if the destination raster is incompatible with the source raster.

getBounds2D

public final Rectangle2D getBounds2D(Raster src)

getMatrix

public final float[][] getMatrix()

Return the matrix used in this operation.

Returns: The matrix used in this operation.

getPoint2D

public final Point2D getPoint2D(Point2D src, Point2D dst)

Return corresponding destination point for source point. Because this is not a geometric operation, it simply returns a copy of the source.

Parameters: src The source point. dst The destination point.

Returns: dst The destination point.

getRenderingHints

public final RenderingHints getRenderingHints()