Class GaussianBlurRed8Bit

java.lang.Object

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

org.apache.batik.ext.awt.image.rendered.GaussianBlurRed8Bit

All Implemented Interfaces:

RenderedImage, CachableRed

public class GaussianBlurRed8Bit
extends AbstractRed

This implementation of RenderableImage will render its input GraphicsNode on demand for tiles.

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field	Description
(package private) ConvolveOp[]	convOp
(package private) static final float	DSQRT2PI	Constant: 3*sqrt(2*PI)/4
(package private) int	dX
(package private) int	dY
(package private) RenderingHints	hints
(package private) static final float	precision	Constant: precision used in computation of the Kernel radius
(package private) static final float	SQRT2PI	Constant: sqrt(2*PI)
(package private) double	stdDevX
(package private) double	stdDevY
(package private) int	xinset
(package private) int	yinset

Fields inherited from class AbstractRed

bounds, cm, minTileX, minTileY, numXTiles, numYTiles, props, sm, srcs, tileGridXOff, tileGridYOff, tileHeight, tileWidth

Constructor Summary

Constructors

Constructor	Description
GaussianBlurRed8Bit(CachableRed src, double stdDevX, double stdDevY, RenderingHints rh)	Construct a blurred version of src, by blurring with a gaussian kernel with standard Deviation of stdDev pixels.
GaussianBlurRed8Bit(CachableRed src, double stdDev, RenderingHints rh)	Construct a blurred version of src, by blurring with a gaussian kernel with standard Deviation of stdDev pixels.

Method Summary

Modifier and Type	Method	Description
private WritableRaster	boxFilterH(Raster src, WritableRaster dest, int skipX, int skipY, int boxSz, int loc)
private WritableRaster	boxFilterV(Raster src, WritableRaster dest, int skipX, int skipY, int boxSz, int loc)
private float[]	computeQualityKernelData(int len, double stdDev)
WritableRaster	copyData(WritableRaster wr)
protected static ColorModel	fixColorModel(CachableRed src)
private Kernel	makeQualityKernelX(int len)
private Kernel	makeQualityKernelY(int len)
static int	surroundPixels(double stdDev)	Calculate the number of surround pixels required for a given standard Deviation.
static int	surroundPixels(double stdDev, RenderingHints hints)	Calculate the number of surround pixels required for a given standard Deviation.

Methods inherited from class AbstractRed

copyBand, copyToRaster, getBounds, getColorModel, getData, getData, getDependencyRegion, getDirtyRegion, getHeight, getMinTileX, getMinTileY, getMinX, getMinY, getNumXTiles, getNumYTiles, getProperty, getPropertyNames, getSampleModel, getSources, getTile, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileWidth, getWidth, getXTile, getYTile, init, init, makeTile, updateTileGridInfo

Methods inherited from class Object

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

Field Details

xinset

int xinset

yinset

int yinset

stdDevX

double stdDevX

stdDevY

double stdDevY

hints

RenderingHints hints

convOp

ConvolveOp[] convOp

dX

int dX

dY

int dY

SQRT2PI

static final float SQRT2PI

Constant: sqrt(2*PI)

DSQRT2PI

static final float DSQRT2PI

Constant: 3*sqrt(2*PI)/4

precision

static final float precision

Constant: precision used in computation of the Kernel radius

See Also:

• Constant Field Values

Constructor Details

GaussianBlurRed8Bit

public GaussianBlurRed8Bit(CachableRed src,
 double stdDev,
 RenderingHints rh)

Construct a blurred version of src, by blurring with a gaussian kernel with standard Deviation of stdDev pixels.

Parameters:

src - The source image to blur

stdDev - The Standard Deviation of the Gaussian kernel.

rh - Rendering hints.

GaussianBlurRed8Bit

public GaussianBlurRed8Bit(CachableRed src,
 double stdDevX,
 double stdDevY,
 RenderingHints rh)

Construct a blurred version of src, by blurring with a gaussian kernel with standard Deviation of stdDev pixels.

Parameters:

src - The source image to blur

stdDevX - The Standard Deviation of the Gaussian kernel in X

stdDevY - The Standard Deviation of the Gaussian kernel in Y

rh - Rendering hints.

Method Details

surroundPixels

public static int surroundPixels(double stdDev)

Calculate the number of surround pixels required for a given standard Deviation.

surroundPixels

public static int surroundPixels(double stdDev,
 RenderingHints hints)

Calculate the number of surround pixels required for a given standard Deviation. Also takes into account rendering quality hint.

computeQualityKernelData

private float[] computeQualityKernelData(int len,
 double stdDev)

makeQualityKernelX

private Kernel makeQualityKernelX(int len)

makeQualityKernelY

private Kernel makeQualityKernelY(int len)

copyData

public WritableRaster copyData(WritableRaster wr)

boxFilterH

private WritableRaster boxFilterH(Raster src,
 WritableRaster dest,
 int skipX,
 int skipY,
 int boxSz,
 int loc)

boxFilterV

private WritableRaster boxFilterV(Raster src,
 WritableRaster dest,
 int skipX,
 int skipY,
 int boxSz,
 int loc)

fixColorModel

protected static ColorModel fixColorModel(CachableRed src)