java.awt.image
class ReplicateScaleFilter

java.lang.Object java.awt.image.ImageFilter java.awt.image.ReplicateScaleFilter

All Implemented Interfaces:

ImageConsumer, Cloneable

Direct Known Subclasses:

AreaAveragingScaleFilter

public class ReplicateScaleFilter
extends ImageFilter

An ImageFilter class for scaling images using the simplest algorithm. This class extends the basic ImageFilter Class to scale an existing image and provide a source for a new image containing the resampled image. The pixels in the source image are sampled to produce pixels for an image of the specified size by replicating rows and columns of pixels to scale up or omitting rows and columns of pixels to scale down.

It is meant to be used in conjunction with a FilteredImageSource object to produce scaled versions of existing images. Due to implementation dependencies, there may be differences in pixel values of an image filtered on different platforms.

destHeight

protected int destHeight

The target height to scale the image.

destWidth

protected int destWidth

The target width to scale the image.

outpixbuf

protected Object outpixbuf

A byte array initialized with a size of {@link #destWidth} and used to deliver a row of pixel data to the {@link ImageConsumer}.

srccols

protected int[] srccols

An int array containing information about a column of pixels.

srcHeight

protected int srcHeight

The height of the source image.

srcrows

protected int[] srcrows

An int array containing information about a row of pixels.

srcWidth

protected int srcWidth

The width of the source image.

ReplicateScaleFilter

public ReplicateScaleFilter(int width,
                            int height)

Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

Parameters:

width - the target width to scale the image

height - the target height to scale the image

setDimensions

public void setDimensions(int w,
                          int h)

Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Overrides:

setDimensions in class ImageFilter

Parameters:

w

h

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      byte[] pixels,
                      int off,
                      int scansize)

Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Overrides:

setPixels in class ImageFilter

Parameters:

x

y

w

h

model

pixels

off

scansize

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      int[] pixels,
                      int off,
                      int scansize)

Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Overrides:

setPixels in class ImageFilter

Parameters:

x

y

w

h

model

pixels

off

scansize

setProperties

public void setProperties(Hashtable props)

Passes along the properties from the source object after adding a property indicating the scale applied. This method invokes super.setProperties, which might result in additional properties being added.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Overrides:

setProperties in class ImageFilter

Parameters:

props