BufferedImageOp
, RasterOp
public class LookupOp extends Object implements 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.
Constructor | Description |
---|---|
LookupOp |
Constructs a LookupOp object given the lookup table and a RenderingHints object, which might be null . |
Modifier and Type | Method | Description |
---|---|---|
BufferedImage |
createCompatibleDestImage |
Creates a zeroed destination image with the correct size and number of bands. |
WritableRaster |
createCompatibleDestRaster |
Creates a zeroed-destination Raster with the correct size and number of bands, given this source. |
final BufferedImage |
filter |
Performs a lookup operation on a BufferedImage . |
final WritableRaster |
filter |
Performs a lookup operation on a Raster . |
final Rectangle2D |
getBounds2D |
Returns the bounding box of the filtered destination image. |
final Rectangle2D |
getBounds2D |
Returns the bounding box of the filtered destination Raster. |
final Point2D |
getPoint2D |
Returns the location of the destination point given a point in the source. |
final RenderingHints |
getRenderingHints() |
Returns the rendering hints for this op. |
final LookupTable |
getTable() |
Returns the LookupTable . |
public LookupOp(LookupTable lookup, RenderingHints hints)
LookupOp
object given the lookup table and a RenderingHints
object, which might be null
.lookup
- the specified LookupTable
hints
- the specified RenderingHints
, or null
public final LookupTable getTable()
LookupTable
.LookupTable
of this LookupOp
.public final BufferedImage filter(BufferedImage src, BufferedImage dst)
BufferedImage
. 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 is null
, a BufferedImage
will be created with an appropriate ColorModel
. An IllegalArgumentException
might be thrown if the number of arrays in the LookupTable
does not meet the restrictions stated in the class comment above, or if the source image has an IndexColorModel
.filter
in interface BufferedImageOp
src
- the BufferedImage
to be filtereddst
- the BufferedImage
in which to store the results of the filter operationBufferedImage
.IllegalArgumentException
- if the number of arrays in the LookupTable
does not meet the restrictions described in the class comments, or if the source image has an IndexColorModel
.public final WritableRaster filter(Raster src, WritableRaster dst)
Raster
. If the destination Raster
is null
, a new Raster
will be created. The IllegalArgumentException
might be thrown if the source Raster
and the destination Raster
do not have the same number of bands or if the number of arrays in the LookupTable
does not meet the restrictions stated in the class comment above.filter
in interface RasterOp
src
- the source Raster
to filterdst
- the destination WritableRaster
for the filtered src
WritableRaster
.IllegalArgumentException
- if the source and destinations rasters do not have the same number of bands, or the number of arrays in the LookupTable
does not meet the restrictions described in the class comments.public final Rectangle2D getBounds2D(BufferedImage src)
getBounds2D
in interface BufferedImageOp
src
- the BufferedImage
to be filteredpublic final Rectangle2D getBounds2D(Raster src)
getBounds2D
in interface RasterOp
src
- the Raster
to be filteredRaster
.public BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM)
null
, an appropriate ColorModel
will be used.createCompatibleDestImage
in interface BufferedImageOp
src
- Source image for the filter operation.destCM
- the destination's ColorModel
, which can be null
.BufferedImage
.public WritableRaster createCompatibleDestRaster(Raster src)
Raster
with the correct size and number of bands, given this source.createCompatibleDestRaster
in interface RasterOp
src
- the Raster
to be transformedRaster
.public final Point2D getPoint2D(Point2D srcPt, Point2D dstPt)
dstPt
is not null
, it will be used to hold the return value. Since this is not a geometric operation, the srcPt
will equal the dstPt
.getPoint2D
in interface BufferedImageOp
getPoint2D
in interface RasterOp
srcPt
- a Point2D
that represents a point in the source imagedstPt
- a Point2D
that represents the location in the destinationPoint2D
in the destination that corresponds to the specified point in the source.public final RenderingHints getRenderingHints()
getRenderingHints
in interface BufferedImageOp
getRenderingHints
in interface RasterOp
RenderingHints
object associated with this op.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/image/LookupOp.html