Class MorphologyOp

java.lang.Object

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

All Implemented Interfaces:

BufferedImageOp, RasterOp

public class MorphologyOp
extends Object
implements BufferedImageOp, RasterOp

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

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	doDilation
private final ColorSpace	lRGB
private int	radiusX	The radius of the operation on X axis
private int	radiusY	The radius of the operation on Y axis
private final int	rangeX
private final int	rangeY
private final ColorSpace	sRGB

Constructor Summary

Constructors

Constructor	Description
MorphologyOp(int radiusX, int radiusY, boolean doDilation)

Method Summary

Modifier and Type	Method	Description
private void	checkCompatible(ColorModel colorModel, SampleModel sampleModel)
private void	checkCompatible(SampleModel model)
BufferedImage	createCompatibleDestImage(BufferedImage src, ColorModel destCM)
WritableRaster	createCompatibleDestRaster(Raster src)
BufferedImage	filter(BufferedImage src, BufferedImage dest)	This implementation of filter does the morphology operation on a premultiplied alpha image.
WritableRaster	filter(Raster src, WritableRaster dest)	Filters src and writes result into dest.
Rectangle2D	getBounds2D(BufferedImage src)
Rectangle2D	getBounds2D(Raster src)
Point2D	getPoint2D(Point2D srcPt, Point2D destPt)
RenderingHints	getRenderingHints()
(package private) static final boolean	isBetter(int v1, int v2, boolean doDilation)
private boolean	isCompatible(ColorModel colorModel, SampleModel sampleModel)
private void	specialProcessColumn(Raster src, WritableRaster dest)
private void	specialProcessRow(Raster src, WritableRaster dest)

Methods inherited from class Object

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

Field Details

radiusX

private int radiusX

The radius of the operation on X axis

radiusY

private int radiusY

The radius of the operation on Y axis

doDilation

private boolean doDilation

rangeX

private final int rangeX

rangeY

private final int rangeY

sRGB

private final ColorSpace sRGB

lRGB

private final ColorSpace lRGB

Constructor Details

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 Details

getBounds2D

public Rectangle2D getBounds2D(Raster src)

Specified by:

getBounds2D in interface RasterOp

getBounds2D

public Rectangle2D getBounds2D(BufferedImage src)

Specified by:

getBounds2D in interface BufferedImageOp

getPoint2D

public Point2D getPoint2D(Point2D srcPt,
 Point2D destPt)

Specified by:

getPoint2D in interface BufferedImageOp

Specified by:

getPoint2D in interface RasterOp

checkCompatible

private void checkCompatible(ColorModel colorModel,
 SampleModel sampleModel)

isCompatible

private boolean isCompatible(ColorModel colorModel,
 SampleModel sampleModel)

checkCompatible

private void checkCompatible(SampleModel model)

getRenderingHints

public RenderingHints getRenderingHints()

Specified by:

getRenderingHints in interface BufferedImageOp

Specified by:

getRenderingHints in interface RasterOp

createCompatibleDestRaster

public WritableRaster createCompatibleDestRaster(Raster src)

Specified by:

createCompatibleDestRaster in interface RasterOp

createCompatibleDestImage

public BufferedImage createCompatibleDestImage(BufferedImage src,
 ColorModel destCM)

Specified by:

createCompatibleDestImage in interface BufferedImageOp

isBetter

static final boolean isBetter(int v1,
 int v2,
 boolean doDilation)

specialProcessRow

private void specialProcessRow(Raster src,
 WritableRaster dest)

specialProcessColumn

private void specialProcessColumn(Raster src,
 WritableRaster dest)

filter

public WritableRaster filter(Raster src,
 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 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 BufferedImage filter(BufferedImage src,
 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 BufferedImageOp