java.awt.image

Class AreaAveragingScaleFilter

java.lang.Object

java.awt.image.ImageFilter

java.awt.image.ReplicateScaleFilter

java.awt.image.AreaAveragingScaleFilter

All Implemented Interfaces:

ImageConsumer, Cloneable

public class AreaAveragingScaleFilter
extends ReplicateScaleFilter

This filter should produce images which do not have image artifacts like broken lines which were originally unbroken. The cost is of course speed. Using bi-linear interpolation here against 4 pixel points should give the desired results although Sun does not specify what the exact algorithm should be.

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

Constructors

Constructor and Description
AreaAveragingScaleFilter(int width, int height) Construct an instance of AreaAveragingScaleFilter which should be used in conjunction with a FilteredImageSource object.

Method Summary

Methods

Modifier and Type	Method and Description
void	setHints(int flags) The ImageProducer should call this method with a bit mask of hints from any of RANDOMPIXELORDER, TOPDOWNLEFTRIGHT, COMPLETESCANLINES, SINGLEPASS, SINGLEFRAME from the ImageConsumer interface.
void	setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int offset, int scansize) This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as a byte at index (n * scansize + m + offset).
void	setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int offset, int scansize) This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as an int at index (n * scansize + m + offset).

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)

Construct an instance of AreaAveragingScaleFilter which should be used in conjunction with a FilteredImageSource object.

Parameters:

width - the width of the destination image

height - the height of the destination image

Method Detail

setHints

public void setHints(int flags)

The ImageProducer should call this method with a bit mask of hints from any of RANDOMPIXELORDER, TOPDOWNLEFTRIGHT, COMPLETESCANLINES, SINGLEPASS, SINGLEFRAME from the ImageConsumer interface.
FIXME - more than likely Sun's implementation desires TOPDOWNLEFTRIGHT order and this method is overloaded here in order to assure that mask is part of the hints added to the consumer.

Specified by:

setHints in interface ImageConsumer

Overrides:

setHints in class ImageFilter

Parameters:

flags - a bit mask of hints

See Also:

ImageConsumer

setPixels

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

This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as a byte at index (n * scansize + m + offset).

Specified by:

setPixels in interface ImageConsumer

Overrides:

setPixels in class ReplicateScaleFilter

Parameters:

x - the x coordinate of the rectangle

y - the y coordinate of the rectangle

w - the width of the rectangle

h - the height of the rectangle

model - the ColorModel used to translate the pixels

pixels - the array of pixel values

offset - the index of the first pixels in the pixels array

scansize - the width to use in extracting pixels from the pixels array

setPixels

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

This function delivers a rectangle of pixels where any pixel(m,n) is stored in the array as an int at index (n * scansize + m + offset).

Specified by:

setPixels in interface ImageConsumer

Overrides:

setPixels in class ReplicateScaleFilter

Parameters:

x - the x coordinate of the rectangle

y - the y coordinate of the rectangle

w - the width of the rectangle

h - the height of the rectangle

model - the ColorModel used to translate the pixels

pixels - the array of pixel values

offset - the index of the first pixels in the pixels array

scansize - the width to use in extracting pixels from the pixels array