public class ReplicateScaleFilter extends ImageFilter
An ImageFilter class for scaling images using the simplest 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 sampled to produce pixels for an image of the specified size by replicating rows and columns of pixels to scale up or omitting rows and columns of pixels to scale down.
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, ImageFilter
protected int srcWidth
The width of the source image.
protected int srcHeight
The height of the source image.
protected int destWidth
The target width to scale the image.
protected int destHeight
The target height to scale the image.
protected int[] srcrows
An int array containing information about a row of pixels.
protected int[] srccols
An int array containing information about a column of pixels.
protected Object outpixbuf
A byte array initialized with a size of destWidth and used to deliver a row of pixel data to the ImageConsumer.
public ReplicateScaleFilter(int width,
int height) Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.
width - the target width to scale the imageheight - the target height to scale the imageIllegalArgumentException - if width equals zero or height equals zeropublic void setProperties(Hashtable<?,?> props)
Passes along the properties from the source object after adding a property indicating the scale applied. This method invokes super.setProperties, which might result in additional properties being added.
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.
setProperties in interface ImageConsumer
setProperties in class ImageFilter
props - the properties from the source objectpublic void setDimensions(int w,
int h) Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.
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.
setDimensions in interface ImageConsumer
setDimensions in class ImageFilter
w - the width of the source imageh - the height of the source imageImageConsumerpublic void setPixels(int x,
int y,
int w,
int h,
ColorModel model,
byte[] pixels,
int off,
int scansize) Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
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 ImageConsumer
setPixels in class ImageFilter
x - the X coordinate of the upper-left corner of the area of pixels to be sety - the Y coordinate of the upper-left corner of the area of pixels to be setw - the width of the area of pixelsh - the height of the area of pixelsmodel - the specified ColorModel
pixels - the array of pixelsoff - the offset into the pixels arrayscansize - the distance from one row of pixels to the next in the pixels arrayImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)public void setPixels(int x,
int y,
int w,
int h,
ColorModel model,
int[] pixels,
int off,
int scansize) Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
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 ImageConsumer
setPixels in class ImageFilter
x - the X coordinate of the upper-left corner of the area of pixels to be sety - the Y coordinate of the upper-left corner of the area of pixels to be setw - the width of the area of pixelsh - the height of the area of pixelsmodel - the specified ColorModel
pixels - the array of pixelsoff - the offset into the pixels arrayscansize - the distance from one row of pixels to the next in the pixels arrayImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)
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