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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » com.sun.media.jai.opimage 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


javax.media.jai.GeometricOpImage
   com.sun.media.jai.opimage.SubsampleBinaryToGrayOpImage

All known Subclasses:   com.sun.media.jai.mlib.MlibSubsampleBinaryToGrayOpImage,
SubsampleBinaryToGrayOpImage
public class SubsampleBinaryToGrayOpImage extends GeometricOpImage (Code)
A class extending GeometricOpImage to subsample binary images to gray scale images. Image scaling operations require rectilinear backwards mapping and padding by the resampling filter dimensions.

When applying scale factors of scaleX, scaleY to a source image with width of src_width and height of src_height, the resulting image is defined to have the following bounds: dst minX = floor(src minX * scaleX) dst minY = floor(src minY * scaleY) dst width = floor(src width * scaleX) dst height = floor(src height * scaleY)
See Also:   ScaleOpImage



Field Summary
protected  floatinvScaleX
     Cached value equal to 1/scaleX.
protected  floatinvScaleY
     Cached value equal to 1/scaleY.
protected  byte[]lutGray
     Convert from number of bits on count to gray value, with scaling, i.e.
protected  floatscaleX
     The horizontal scale factor.
protected  floatscaleY
     The vertical scale factor.

Constructor Summary
public  SubsampleBinaryToGrayOpImage(RenderedImage source, ImageLayout layout, Map config, float scaleX, float scaleY)
     Constructs a SubsampleBinaryToGrayOpImage from a RenderedImage source, x and y scale object.

Method Summary
protected  RectanglebackwardMapRect(Rectangle destRect, int sourceIndex)
     Returns the minimum bounding box of the region of the specified source to which a particular Rectangle of the destination will be mapped.
Parameters:
  destRect - the Rectangle in destination coordinates.
Parameters:
  sourceIndex - the index of the source image.
protected  voidcomputeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)
     Performs a subsamplebinarytogray operation on a specified rectangle.
protected  RectangleforwardMapRect(Rectangle sourceRect, int sourceIndex)
     Returns the minimum bounding box of the region of the destination to which a particular Rectangle of the specified source will be mapped.
Parameters:
  sourceRect - the Rectangle in source coordinates.
Parameters:
  sourceIndex - the index of the source image.
static  booleanisMinWhite(ColorModel cm)
    
static  ImageLayoutlayoutHelper(RenderedImage source, float scaleX, float scaleY, ImageLayout il, Map config)
    
public  Point2DmapDestPoint(Point2D destPt)
     Computes the source point corresponding to the supplied point.
Parameters:
  destPt - the position in destination image coordinatesto map to source image coordinates.
public  Point2DmapSourcePoint(Point2D sourcePt)
     Computes the destination point corresponding to the supplied point.
Parameters:
  sourcePt - the position in source image coordinatesto map to destination image coordinates.

Field Detail
invScaleX
protected float invScaleX(Code)
Cached value equal to 1/scaleX.



invScaleY
protected float invScaleY(Code)
Cached value equal to 1/scaleY.



lutGray
protected byte[] lutGray(Code)
Convert from number of bits on count to gray value, with scaling, i.e. if invScaleX,Y=3,3, then the possible bit counts are 0..9, hence the lookup tables are [0..9] * 255/9.



scaleX
protected float scaleX(Code)
The horizontal scale factor.



scaleY
protected float scaleY(Code)
The vertical scale factor.




Constructor Detail
SubsampleBinaryToGrayOpImage
public SubsampleBinaryToGrayOpImage(RenderedImage source, ImageLayout layout, Map config, float scaleX, float scaleY)(Code)
Constructs a SubsampleBinaryToGrayOpImage from a RenderedImage source, x and y scale object. The image dimensions are determined by forward-mapping the source bounds, and are passed to the superclass constructor by means of the layout parameter. Other fields of the layout are passed through unchanged. If layout is null, a new ImageLayout will be constructor to hold the bounds information. The float rounding errors, such as 1.2 being internally represented as 1.200001, are dealt with the floatTol, which is set up so that only 1/10 of pixel error will occur at the end of a line, which yields correct results with Math.round() operation. The repeatability is guaranteed with a one-time computed table xvalues and yvalues.
Parameters:
  layout - an ImageLayout optionally containingthe tile grid layout, SampleModel, andColorModel, or null.
Parameters:
  source - a RenderedImage.from this OpImage, or null. Ifnull, no caching will be performed.
Parameters:
  cobbleSources - a boolean indicating whethercomputeRect expects contiguous sources.
Parameters:
  extender - a BorderExtender, or null.
Parameters:
  interp - an Interpolation object to use forresampling.
Parameters:
  scaleX - scale factor along x axis.
Parameters:
  scaleY - scale factor along y axis.
throws:
  IllegalArgumentException - if combining thesource bounds with the layout parameter results in negativeoutput width or height.




Method Detail
backwardMapRect
protected Rectangle backwardMapRect(Rectangle destRect, int sourceIndex)(Code)
Returns the minimum bounding box of the region of the specified source to which a particular Rectangle of the destination will be mapped.
Parameters:
  destRect - the Rectangle in destination coordinates.
Parameters:
  sourceIndex - the index of the source image. a Rectangle indicating the source bounding box,or null if the bounding box is unknown.
throws:
  IllegalArgumentException - if sourceIndex isnegative or greater than the index of the last source.
throws:
  IllegalArgumentException - if destRect isnull.



computeRect
protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code)
Performs a subsamplebinarytogray operation on a specified rectangle. The sources are cobbled.
Parameters:
  sources - an array of source Rasters, guaranteed to provide allnecessary source data for computing the output.
Parameters:
  dest - a WritableRaster containing the area to be computed.
Parameters:
  destRect - the rectangle within dest to be processed.



forwardMapRect
protected Rectangle forwardMapRect(Rectangle sourceRect, int sourceIndex)(Code)
Returns the minimum bounding box of the region of the destination to which a particular Rectangle of the specified source will be mapped.
Parameters:
  sourceRect - the Rectangle in source coordinates.
Parameters:
  sourceIndex - the index of the source image. a Rectangle indicating the destinationbounding box, or null if the bounding boxis unknown.
throws:
  IllegalArgumentException - if sourceIndex isnegative or greater than the index of the last source.
throws:
  IllegalArgumentException - if sourceRect isnull.



isMinWhite
static boolean isMinWhite(ColorModel cm)(Code)



layoutHelper
static ImageLayout layoutHelper(RenderedImage source, float scaleX, float scaleY, ImageLayout il, Map config)(Code)



mapDestPoint
public Point2D mapDestPoint(Point2D destPt)(Code)
Computes the source point corresponding to the supplied point.
Parameters:
  destPt - the position in destination image coordinatesto map to source image coordinates. a Point2D of the same class asdestPt.
throws:
  IllegalArgumentException - if destPt isnull.
since:
   JAI 1.1.2



mapSourcePoint
public Point2D mapSourcePoint(Point2D sourcePt)(Code)
Computes the destination point corresponding to the supplied point.
Parameters:
  sourcePt - the position in source image coordinatesto map to destination image coordinates. a Point2D of the same class assourcePt.
throws:
  IllegalArgumentException - if sourcePt isnull.
since:
   JAI 1.1.2



Fields inherited from javax.media.jai.GeometricOpImage
protected double[] backgroundValues(Code)(Java Doc)
protected Rectangle computableBounds(Code)(Java Doc)
protected BorderExtender extender(Code)(Java Doc)
protected int[] intBackgroundValues(Code)(Java Doc)
protected Interpolation interp(Code)(Java Doc)
protected boolean setBackground(Code)(Java Doc)

Methods inherited from javax.media.jai.GeometricOpImage
abstract protected Rectangle backwardMapRect(Rectangle destRect, int sourceIndex)(Code)(Java Doc)
public Raster computeTile(int tileX, int tileY)(Code)(Java Doc)
abstract protected Rectangle forwardMapRect(Rectangle sourceRect, int sourceIndex)(Code)(Java Doc)
public BorderExtender getBorderExtender()(Code)(Java Doc)
public Interpolation getInterpolation()(Code)(Java Doc)
public Point2D mapDestPoint(Point2D destPt, int sourceIndex)(Code)(Java Doc)
public Rectangle mapDestRect(Rectangle destRect, int sourceIndex)(Code)(Java Doc)
public Point2D mapSourcePoint(Point2D sourcePt, int sourceIndex)(Code)(Java Doc)
public Rectangle mapSourceRect(Rectangle sourceRect, int sourceIndex)(Code)(Java Doc)

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