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AreaAveragingScaleFilter (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, 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

All Implemented Interfaces:

Cloneable, ImageConsumer

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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. Due to implementation dependencies, there may be differences in pixel values of an image filtered on different platforms.

See Also:

FilteredImageSource, ReplicateScaleFilter, ImageFilter

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Field Summary

 

Fields inherited from class java.awt.image.ReplicateScaleFilter

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

 

Fields inherited from class java.awt.image.ImageFilter

consumer

 

Fields inherited from interface java.awt.image.ImageConsumer

COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT

 

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.

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.

Specified by:

setHints in interface ImageConsumer

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.

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.

Specified by:

setPixels in interface ImageConsumer

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.

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.

Specified by:

setPixels in interface ImageConsumer

Overrides:

setPixels in class ReplicateScaleFilter

See Also:

ReplicateScaleFilter

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.