- java.lang.Object
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- java.awt.image.LookupOp
 
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- All Implemented Interfaces:
- BufferedImageOp,- RasterOp
 
 public class LookupOp extends Object implements BufferedImageOp, RasterOp This class implements a lookup operation from the source to the destination. The LookupTable object may contain a single array or multiple arrays, subject to the restrictions below.For Rasters, the lookup operates on bands. The number of lookup arrays may be one, in which case the same array is applied to all bands, or it must equal the number of Source Raster bands. For BufferedImages, the lookup operates on color and alpha components. The number of lookup arrays may be one, in which case the same array is applied to all color (but not alpha) components. Otherwise, the number of lookup arrays may equal the number of Source color components, in which case no lookup of the alpha component (if present) is performed. If neither of these cases apply, the number of lookup arrays must equal the number of Source color components plus alpha components, in which case lookup is performed for all color and alpha components. This allows non-uniform rescaling of multi-band BufferedImages. BufferedImage sources with premultiplied alpha data are treated in the same manner as non-premultiplied images for purposes of the lookup. That is, the lookup is done per band on the raw data of the BufferedImage source without regard to whether the data is premultiplied. If a color conversion is required to the destination ColorModel, the premultiplied state of both source and destination will be taken into account for this step. Images with an IndexColorModel cannot be used. If a RenderingHints object is specified in the constructor, the color rendering hint and the dithering hint may be used when color conversion is required. This class allows the Source to be the same as the Destination. 
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Constructor SummaryConstructors Constructor Description LookupOp(LookupTable lookup, RenderingHints hints)Constructs aLookupOpobject given the lookup table and aRenderingHintsobject, which might benull.
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description BufferedImagecreateCompatibleDestImage(BufferedImage src, ColorModel destCM)Creates a zeroed destination image with the correct size and number of bands.WritableRastercreateCompatibleDestRaster(Raster src)Creates a zeroed-destinationRasterwith the correct size and number of bands, given this source.BufferedImagefilter(BufferedImage src, BufferedImage dst)Performs a lookup operation on aBufferedImage.WritableRasterfilter(Raster src, WritableRaster dst)Performs a lookup operation on aRaster.Rectangle2DgetBounds2D(BufferedImage src)Returns the bounding box of the filtered destination image.Rectangle2DgetBounds2D(Raster src)Returns the bounding box of the filtered destination Raster.Point2DgetPoint2D(Point2D srcPt, Point2D dstPt)Returns the location of the destination point given a point in the source.RenderingHintsgetRenderingHints()Returns the rendering hints for this op.LookupTablegetTable()Returns theLookupTable.
 
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Constructor Detail- 
LookupOppublic LookupOp(LookupTable lookup, RenderingHints hints) Constructs aLookupOpobject given the lookup table and aRenderingHintsobject, which might benull.- Parameters:
- lookup- the specified- LookupTable
- hints- the specified- RenderingHints, or- null
 
 
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Method Detail- 
getTablepublic final LookupTable getTable() Returns theLookupTable.- Returns:
- the LookupTableof thisLookupOp.
 
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filterpublic final BufferedImage filter(BufferedImage src, BufferedImage dst) Performs a lookup operation on aBufferedImage. If the color model in the source image is not the same as that in the destination image, the pixels will be converted in the destination. If the destination image isnull, aBufferedImagewill be created with an appropriateColorModel. AnIllegalArgumentExceptionmight be thrown if the number of arrays in theLookupTabledoes not meet the restrictions stated in the class comment above, or if the source image has anIndexColorModel.- Specified by:
- filterin interface- BufferedImageOp
- Parameters:
- src- the- BufferedImageto be filtered
- dst- the- BufferedImagein which to store the results of the filter operation
- Returns:
- the filtered BufferedImage.
- Throws:
- IllegalArgumentException- if the number of arrays in the- LookupTabledoes not meet the restrictions described in the class comments, or if the source image has an- IndexColorModel.
 
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filterpublic final WritableRaster filter(Raster src, WritableRaster dst) Performs a lookup operation on aRaster. If the destinationRasterisnull, a newRasterwill be created. TheIllegalArgumentExceptionmight be thrown if the sourceRasterand the destinationRasterdo not have the same number of bands or if the number of arrays in theLookupTabledoes not meet the restrictions stated in the class comment above.- Specified by:
- filterin interface- RasterOp
- Parameters:
- src- the source- Rasterto filter
- dst- the destination- WritableRasterfor the filtered- src
- Returns:
- the filtered WritableRaster.
- Throws:
- IllegalArgumentException- if the source and destinations rasters do not have the same number of bands, or the number of arrays in the- LookupTabledoes not meet the restrictions described in the class comments.
 
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getBounds2Dpublic final Rectangle2D getBounds2D(BufferedImage src) Returns the bounding box of the filtered destination image. Since this is not a geometric operation, the bounding box does not change.- Specified by:
- getBounds2Din interface- BufferedImageOp
- Parameters:
- src- the- BufferedImageto be filtered
- Returns:
- the bounds of the filtered definition image.
 
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getBounds2Dpublic final Rectangle2D getBounds2D(Raster src) Returns the bounding box of the filtered destination Raster. Since this is not a geometric operation, the bounding box does not change.- Specified by:
- getBounds2Din interface- RasterOp
- Parameters:
- src- the- Rasterto be filtered
- Returns:
- the bounds of the filtered definition Raster.
 
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createCompatibleDestImagepublic BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM) Creates a zeroed destination image with the correct size and number of bands. If destCM isnull, an appropriateColorModelwill be used.- Specified by:
- createCompatibleDestImagein interface- BufferedImageOp
- Parameters:
- src- Source image for the filter operation.
- destCM- the destination's- ColorModel, which can be- null.
- Returns:
- a filtered destination BufferedImage.
 
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createCompatibleDestRasterpublic WritableRaster createCompatibleDestRaster(Raster src) Creates a zeroed-destinationRasterwith the correct size and number of bands, given this source.- Specified by:
- createCompatibleDestRasterin interface- RasterOp
- Parameters:
- src- the- Rasterto be transformed
- Returns:
- the zeroed-destination Raster.
 
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getPoint2Dpublic final Point2D getPoint2D(Point2D srcPt, Point2D dstPt) Returns the location of the destination point given a point in the source. IfdstPtis notnull, it will be used to hold the return value. Since this is not a geometric operation, thesrcPtwill equal thedstPt.- Specified by:
- getPoint2Din interface- BufferedImageOp
- Specified by:
- getPoint2Din interface- RasterOp
- Parameters:
- srcPt- a- Point2Dthat represents a point in the source image
- dstPt- a- Point2Dthat represents the location in the destination
- Returns:
- the Point2Din the destination that corresponds to the specified point in the source.
 
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getRenderingHintspublic final RenderingHints getRenderingHints() Returns the rendering hints for this op.- Specified by:
- getRenderingHintsin interface- BufferedImageOp
- Specified by:
- getRenderingHintsin interface- RasterOp
- Returns:
- the RenderingHintsobject associated with this op.
 
 
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