Class java.awt.image.AreaAveragingScaleFilter - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.awt.image.AreaAveragingScaleFilter

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

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

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

setHints(int): Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.
setPixels(int, int, int, int, ColorModel, byte[], int, int): 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.
setPixels(int, int, int, int, ColorModel, int[], int, int): 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.

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

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:: setHints

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

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

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Submit a bug or feature - Version 1.1.8 of Java Platform API Specification
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.
Copyright 1995-1999 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.