Class LookupOp
- All Implemented Interfaces:
BufferedImageOp
,RasterOp
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.
- See Also:
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Constructor Summary
ConstructorDescriptionLookupOp
(LookupTable lookup, RenderingHints hints) Constructs aLookupOp
object given the lookup table and aRenderingHints
object, which might benull
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Method Summary
Modifier and TypeMethodDescriptioncreateCompatibleDestImage
(BufferedImage src, ColorModel destCM) Creates a zeroed destination image with the correct size and number of bands.Creates a zeroed-destinationRaster
with the correct size and number of bands, given this source.final BufferedImage
filter
(BufferedImage src, BufferedImage dst) Performs a lookup operation on aBufferedImage
.final WritableRaster
filter
(Raster src, WritableRaster dst) Performs a lookup operation on aRaster
.final Rectangle2D
getBounds2D
(BufferedImage src) Returns the bounding box of the filtered destination image.final Rectangle2D
getBounds2D
(Raster src) Returns the bounding box of the filtered destination Raster.final Point2D
getPoint2D
(Point2D srcPt, Point2D dstPt) Returns the location of the destination point given a point in the source.final RenderingHints
Returns the rendering hints for this op.final LookupTable
getTable()
Returns theLookupTable
.
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Constructor Details
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LookupOp
Constructs aLookupOp
object given the lookup table and aRenderingHints
object, which might benull
.- Parameters:
lookup
- the specifiedLookupTable
hints
- the specifiedRenderingHints
, ornull
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Method Details
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getTable
Returns theLookupTable
.- Returns:
- the
LookupTable
of thisLookupOp
.
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filter
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
, aBufferedImage
will be created with an appropriateColorModel
. AnIllegalArgumentException
might be thrown if the number of arrays in theLookupTable
does not meet the restrictions stated in the class comment above, or if the source image has anIndexColorModel
.- Specified by:
filter
in interfaceBufferedImageOp
- Parameters:
src
- theBufferedImage
to be filtereddst
- theBufferedImage
in which to store the results of the filter operation- Returns:
- the filtered
BufferedImage
. - Throws:
IllegalArgumentException
- if the number of arrays in theLookupTable
does not meet the restrictions described in the class comments, or if the source image has anIndexColorModel
.
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filter
Performs a lookup operation on aRaster
. If the destinationRaster
isnull
, a newRaster
will be created. TheIllegalArgumentException
might be thrown if the sourceRaster
and the destinationRaster
do not have the same number of bands or if the number of arrays in theLookupTable
does not meet the restrictions stated in the class comment above.- Specified by:
filter
in interfaceRasterOp
- Parameters:
src
- the sourceRaster
to filterdst
- the destinationWritableRaster
for the filteredsrc
- 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 theLookupTable
does not meet the restrictions described in the class comments.
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getBounds2D
Returns the bounding box of the filtered destination image. Since this is not a geometric operation, the bounding box does not change.- Specified by:
getBounds2D
in interfaceBufferedImageOp
- Parameters:
src
- theBufferedImage
to be filtered- Returns:
- the bounds of the filtered definition image.
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getBounds2D
Returns the bounding box of the filtered destination Raster. Since this is not a geometric operation, the bounding box does not change.- Specified by:
getBounds2D
in interfaceRasterOp
- Parameters:
src
- theRaster
to be filtered- Returns:
- the bounds of the filtered definition
Raster
.
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createCompatibleDestImage
Creates a zeroed destination image with the correct size and number of bands. If destCM isnull
, an appropriateColorModel
will be used.- Specified by:
createCompatibleDestImage
in interfaceBufferedImageOp
- Parameters:
src
- Source image for the filter operation.destCM
- the destination'sColorModel
, which can benull
.- Returns:
- a filtered destination
BufferedImage
.
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createCompatibleDestRaster
Creates a zeroed-destinationRaster
with the correct size and number of bands, given this source.- Specified by:
createCompatibleDestRaster
in interfaceRasterOp
- Parameters:
src
- theRaster
to be transformed- Returns:
- the zeroed-destination
Raster
.
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getPoint2D
Returns the location of the destination point given a point in the source. IfdstPt
is notnull
, it will be used to hold the return value. Since this is not a geometric operation, thesrcPt
will equal thedstPt
.- Specified by:
getPoint2D
in interfaceBufferedImageOp
- Specified by:
getPoint2D
in interfaceRasterOp
- Parameters:
srcPt
- aPoint2D
that represents a point in the source imagedstPt
- aPoint2D
that represents the location in the destination- Returns:
- the
Point2D
in the destination that corresponds to the specified point in the source.
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getRenderingHints
Returns the rendering hints for this op.- Specified by:
getRenderingHints
in interfaceBufferedImageOp
- Specified by:
getRenderingHints
in interfaceRasterOp
- Returns:
- the
RenderingHints
object associated with this op.
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