public class AreaAveragingScaleFilter extends ReplicateScaleFilter
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.
FilteredImageSource,
ReplicateScaleFilter,
ImageFilterdestHeight, destWidth, outpixbuf, srccols, srcHeight, srcrows, srcWidthconsumerCOMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT| Constructor and Description |
|---|
AreaAveragingScaleFilter(int width,
int height)
Constructs an AreaAveragingScaleFilter that scales the pixels from
its source Image as specified by the width and height parameters.
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| Modifier and Type | Method and Description |
|---|---|
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.
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setDimensions, setPropertiesclone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModelpublic AreaAveragingScaleFilter(int width,
int height)
width - the target width to scale the imageheight - the target height to scale the imagepublic void setHints(int 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.
setHints in interface ImageConsumersetHints in class ImageFilterhints - a set of hints that the ImageConsumer uses to
process the pixelsImageConsumer.setHints(int)public void setPixels(int x,
int y,
int w,
int h,
ColorModel model,
byte[] pixels,
int off,
int scansize)
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.
setPixels in interface ImageConsumersetPixels in class ReplicateScaleFilterw - the width of the area of pixelsh - the height of the area of pixelsmodel - the specified ColorModelpixels - the array of pixelsoff - the offset into the pixels arrayscansize - the distance from one row of pixels to the next in
the pixels arrayReplicateScaleFilterpublic void setPixels(int x,
int y,
int w,
int h,
ColorModel model,
int[] pixels,
int off,
int scansize)
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.
setPixels in interface ImageConsumersetPixels in class ReplicateScaleFilterw - the width of the area of pixelsh - the height of the area of pixelsmodel - the specified ColorModelpixels - the array of pixelsoff - the offset into the pixels arrayscansize - the distance from one row of pixels to the next in
the pixels arrayReplicateScaleFilterCopyright © 2012. All Rights Reserved.