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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class AreaAveragingScaleFilter - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt.image
Class AreaAveragingScaleFilter

java.lang.Object
  |
  +--java.awt.image.ImageFilter
        |
        +--java.awt.image.ReplicateScaleFilter
              |
              +--java.awt.image.AreaAveragingScaleFilter

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public class AreaAveragingScaleFilter

extends ReplicateScaleFilter

An ImageFilter class for scaling images using a simple area averaging algorithm that produces smoother results than the nearest neighbor 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 blended to produce pixels for an image of the specified size. The blending process is analogous to scaling up the source image to a multiple of the destination size using pixel replication and then scaling it back down to the destination size by simply averaging all the pixels in the supersized image that fall within a given pixel of the destination image. If the data from the source is not delivered in TopDownLeftRight order then the filter will back off to a simple pixel replication behavior and utilize the requestTopDownLeftRightResend() method to refilter the pixels in a better way at the end. It is meant to be used in conjunction with a FilteredImageSource object to produce scaled versions of existing images.

See Also:

FilteredImageSource, ReplicateImageFilter, ImageFilter

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Fields inherited from class java.awt.image.ReplicateScaleFilter

destHeight, destWidth, outpixbuf, srccols, srcHeight, srcrows, srcWidth

 

Fields inherited from class java.awt.image.ImageFilter

consumer

 

Constructor Summary

AreaAveragingScaleFilter(int width, int height)           Constructs an AreaAveragingScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

 

Method Summary
void	setHints(int hints)           Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.
void	setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)           Combine the components for the delivered byte pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete.
void	setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)           Combine the components for the delivered int pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete.

 

Methods inherited from class java.awt.image.ReplicateScaleFilter

setDimensions, setProperties

 

Methods inherited from class java.awt.image.ImageFilter

clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModel

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

AreaAveragingScaleFilter

public AreaAveragingScaleFilter(int width,
                                int height)

Constructs an AreaAveragingScaleFilter 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

Method Detail

setHints

public void setHints(int hints)

Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.

Overrides:

setHints in class ImageFilter

See Also:

ImageConsumer.setHints(int)

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setPixels

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

Combine the components for the delivered byte pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete. If the correct hints were not specified in the setHints call then relay the work to our superclass which is capable of scaling pixels regardless of the delivery hints.

Overrides:

setPixels in class ReplicateScaleFilter

See Also:

ReplicateScaleFilter

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setPixels

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

Combine the components for the delivered int pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete. If the correct hints were not specified in the setHints call then relay the work to our superclass which is capable of scaling pixels regardless of the delivery hints.

Overrides:

setPixels in class ReplicateScaleFilter

See Also:

ReplicateScaleFilter

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