org.apache.batik.ext.awt.image.rendered
Class MorphologyOp

java.lang.Object
  |
  +--org.apache.batik.ext.awt.image.rendered.MorphologyOp

All Implemented Interfaces:

java.awt.image.BufferedImageOp, java.awt.image.RasterOp

public class MorphologyOp

extends java.lang.Object

implements java.awt.image.BufferedImageOp, java.awt.image.RasterOp

This class provides an implementation for the SVG feMorphology filter, as defined in Chapter 15, section 20 of the SVG specification.

Constructor Summary

MorphologyOp(int radiusX, int radiusY, boolean doDilation)

Method Summary

java.awt.image.BufferedImage	createCompatibleDestImage(java.awt.image.BufferedImage src, java.awt.image.ColorModel destCM)
java.awt.image.WritableRaster	createCompatibleDestRaster(java.awt.image.Raster src)
java.awt.image.BufferedImage	filter(java.awt.image.BufferedImage src, java.awt.image.BufferedImage dest) This implementation of filter does the morphology operation on a premultiplied alpha image.
java.awt.image.WritableRaster	filter(java.awt.image.Raster src, java.awt.image.WritableRaster dest) Filters src and writes result into dest.
java.awt.geom.Rectangle2D	getBounds2D(java.awt.image.BufferedImage src)
java.awt.geom.Rectangle2D	getBounds2D(java.awt.image.Raster src)
java.awt.geom.Point2D	getPoint2D(java.awt.geom.Point2D srcPt, java.awt.geom.Point2D destPt)
java.awt.RenderingHints	getRenderingHints()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MorphologyOp

public MorphologyOp(int radiusX,
                    int radiusY,
                    boolean doDilation)

Parameters:

radiusX - defines the radius of filter operation on X-axis. Should not be negative. A value of zero will disable the effect of the operation on X-axis, as described in the SVG specification.

radiusY - defines the radius of filter operation on Y-axis. Should not be negative. A value of zero will disable the effect of the operation on Y-axis, as described in the SVG specification.

doDilation - defines whether to do dilation or erosion operation. Will do dilation when the value is true, erosion when false.

Method Detail

getBounds2D

public java.awt.geom.Rectangle2D getBounds2D(java.awt.image.Raster src)

Specified by:

getBounds2D in interface java.awt.image.RasterOp

getBounds2D

public java.awt.geom.Rectangle2D getBounds2D(java.awt.image.BufferedImage src)

Specified by:

getBounds2D in interface java.awt.image.BufferedImageOp

getPoint2D

public java.awt.geom.Point2D getPoint2D(java.awt.geom.Point2D srcPt,
                                        java.awt.geom.Point2D destPt)

Specified by:

getPoint2D in interface java.awt.image.BufferedImageOp

getRenderingHints

public java.awt.RenderingHints getRenderingHints()

Specified by:

getRenderingHints in interface java.awt.image.BufferedImageOp

createCompatibleDestRaster

public java.awt.image.WritableRaster createCompatibleDestRaster(java.awt.image.Raster src)

Specified by:

createCompatibleDestRaster in interface java.awt.image.RasterOp

createCompatibleDestImage

public java.awt.image.BufferedImage createCompatibleDestImage(java.awt.image.BufferedImage src,
                                                              java.awt.image.ColorModel destCM)

Specified by:

createCompatibleDestImage in interface java.awt.image.BufferedImageOp

filter

public java.awt.image.WritableRaster filter(java.awt.image.Raster src,
                                            java.awt.image.WritableRaster dest)

Filters src and writes result into dest. If dest if null, then a Raster is created. If dest and src refer to the same object, then the source is modified.

The filtering kernel(the operation range for each pixel) is a rectangle of width 2*radiusX+1 and height radiusY+1

Specified by:

filter in interface java.awt.image.RasterOp

Parameters:

src - the Raster to be filtered

dest - stores the filtered image. If null, a destination will be created. src and dest can refer to the same Raster, in which situation the src will be modified.

filter

public java.awt.image.BufferedImage filter(java.awt.image.BufferedImage src,
                                           java.awt.image.BufferedImage dest)

This implementation of filter does the morphology operation on a premultiplied alpha image. This tends to muddy the colors. so something that is supposed to be a mostly transparent bright red may well become a muddy opaque red. Where as I think it should become a bright opaque red. Which is the result you would get if you were using unpremult data.

Specified by:

filter in interface java.awt.image.BufferedImageOp