jdk.awt.image.ConvolveOp — clojure-interop/java.awt 1.0.5

This class implements a convolution from the source to the destination. Convolution using a convolution kernel is a spatial operation that computes the output pixel from an input pixel by multiplying the kernel with the surround of the input pixel. This allows the output pixel to be affected by the immediate neighborhood in a way that can be mathematically specified with a kernel.

This class operates with BufferedImage data in which color components are premultiplied with the alpha component. If the Source BufferedImage has an alpha component, and the color components are not premultiplied with the alpha component, then the data are premultiplied before being convolved. If the Destination has color components which are not premultiplied, then alpha is divided out before storing into the Destination (if alpha is 0, the color components are set to 0). If the Destination has no alpha component, then the resulting alpha is discarded after first dividing it out of the color components.

Rasters are treated as having no alpha channel. If the above treatment of the alpha channel in BufferedImages is not desired, it may be avoided by getting the Raster of a source BufferedImage and using the filter method of this class which works with Rasters.

If a RenderingHints object is specified in the constructor, the color rendering hint and the dithering hint may be used when color conversion is required.

Note that the Source and the Destination may not be the same object.

*-edge-no-op clj

Static Constant.

Pixels at the edge of the source image are copied to the corresponding pixels in the destination without modification.

type: int

*-edge-zero-fill clj

Static Constant.

Pixels at the edge of the destination image are set to zero. This is the default.

type: int

->convolve-op clj

(->convolve-op kernel)

(->convolve-op kernel edge-condition hints)

Constructor.

Constructs a ConvolveOp given a Kernel, an edge condition, and a RenderingHints object (which may be null).

kernel - the specified Kernel - java.awt.image.Kernel edge-condition - the specified edge condition - int hints - the specified RenderingHints object - java.awt.RenderingHints

create-compatible-dest-image clj

(create-compatible-dest-image this src dest-cm)

Creates a zeroed destination image with the correct size and number of bands. If destCM is null, an appropriate ColorModel will be used.

src - Source image for the filter operation. - java.awt.image.BufferedImage dest-cm - ColorModel of the destination. Can be null. - java.awt.image.ColorModel

returns: a destination BufferedImage with the correct size and number of bands. - java.awt.image.BufferedImage

create-compatible-dest-raster clj

(create-compatible-dest-raster this src)

Creates a zeroed destination Raster with the correct size and number of bands, given this source.

src - the source Raster - java.awt.image.Raster

returns: a WritableRaster that is compatible with src - java.awt.image.WritableRaster

filter clj

(filter this src dst)

Performs a convolution on BufferedImages. Each component of the source image will be convolved (including the alpha component, if present). If the color model in the source image is not the same as that in the destination image, the pixels will be converted in the destination. If the destination image is null, a BufferedImage will be created with the source ColorModel. The IllegalArgumentException may be thrown if the source is the same as the destination.

src - the source BufferedImage to filter - java.awt.image.BufferedImage dst - the destination BufferedImage for the filtered src - java.awt.image.BufferedImage

returns: the filtered BufferedImage - java.awt.image.BufferedImage

throws: java.lang.NullPointerException - if src is null

get-bounds-2-d clj

(get-bounds-2-d this src)

Returns the bounding box of the filtered destination image. Since this is not a geometric operation, the bounding box does not change.

src - The BufferedImage to be filtered - java.awt.image.BufferedImage

returns: The Rectangle2D representing the destination image's bounding box. - java.awt.geom.Rectangle2D

get-edge-condition clj

(get-edge-condition this)

Returns the edge condition.

returns: the edge condition of this ConvolveOp. - int

get-kernel clj

(get-kernel this)

Returns the Kernel.

returns: the Kernel of this ConvolveOp. - java.awt.image.Kernel

get-point-2-d clj

(get-point-2-d this src-pt dst-pt)

Returns the location of the destination point given a point in the source. If dstPt is non-null, it will be used to hold the return value. Since this is not a geometric operation, the srcPt will equal the dstPt.

src-pt - the Point2D that represents the point in the source image - java.awt.geom.Point2D dst-pt - The Point2D in which to store the result - java.awt.geom.Point2D

returns: The Point2D in the destination image that corresponds to the specified point in the source image. - java.awt.geom.Point2D

get-rendering-hints clj

(get-rendering-hints this)

Returns the rendering hints for this op.

returns: The RenderingHints object for this BufferedImageOp. Returns null if no hints have been set. - java.awt.RenderingHints