Class LookupOp
- java.lang.Object
-
- java.awt.image.LookupOp
- 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.
Constructors
Constructor | Description |
---|---|
LookupOp(LookupTable lookup,
RenderingHints hints) | Constructs a |
Methods
Modifier and Type | Method | Description |
---|---|---|
BufferedImage | createCompatibleDestImage(BufferedImage src,
ColorModel destCM) | Creates a zeroed destination image with the correct size and number of bands. |
WritableRaster | createCompatibleDestRaster(Raster src) | Creates a zeroed-destination |
BufferedImage | filter(BufferedImage src,
BufferedImage dst) | Performs a lookup operation on a |
WritableRaster | filter(Raster src,
WritableRaster dst) | Performs a lookup operation on a |
Rectangle2D | getBounds2D(BufferedImage src) | Returns the bounding box of the filtered destination image. |
Rectangle2D | getBounds2D(Raster src) | Returns the bounding box of the filtered destination Raster. |
Point2D | getPoint2D(Point2D srcPt,
Point2D dstPt) | Returns the location of the destination point given a point in the source. |
RenderingHints | getRenderingHints() | Returns the rendering hints for this op. |
LookupTable | getTable() | Returns the |
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Constructors
LookupOp
public LookupOp(LookupTable lookup, RenderingHints hints)
Constructs a LookupOp
object given the lookup table and a RenderingHints
object, which might be null
.
- Parameters:
-
lookup
- the specifiedLookupTable
-
hints
- the specifiedRenderingHints
, ornull
Methods
getTable
public final LookupTable getTable()
Returns the LookupTable
.
- Returns:
- the
LookupTable
of thisLookupOp
.
filter
public final BufferedImage filter(BufferedImage src, BufferedImage dst)
Performs a lookup operation on a 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
.
- Specified by:
-
filter
in interfaceBufferedImageOp
- Parameters:
-
src
- theBufferedImage
to be filtered -
dst
- 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
.
filter
public final WritableRaster filter(Raster src, WritableRaster dst)
Performs a lookup operation on a 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.
- Specified by:
-
filter
in interfaceRasterOp
- Parameters:
-
src
- the sourceRaster
to filter -
dst
- 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.
getBounds2D
public 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:
-
getBounds2D
in interfaceBufferedImageOp
- Parameters:
-
src
- theBufferedImage
to be filtered - Returns:
- the bounds of the filtered definition image.
getBounds2D
public 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:
-
getBounds2D
in interfaceRasterOp
- Parameters:
-
src
- theRaster
to be filtered - Returns:
- the bounds of the filtered definition
Raster
.
createCompatibleDestImage
public BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM)
Creates a zeroed destination image with the correct size and number of bands. If destCM is null
, an appropriate ColorModel
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
.
createCompatibleDestRaster
public WritableRaster createCompatibleDestRaster(Raster src)
Creates a zeroed-destination Raster
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
.
getPoint2D
public final Point2D getPoint2D(Point2D srcPt, Point2D dstPt)
Returns the location of the destination point given a point in the source. If 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
.
- Specified by:
-
getPoint2D
in interfaceBufferedImageOp
- Specified by:
-
getPoint2D
in interfaceRasterOp
- Parameters:
-
srcPt
- aPoint2D
that represents a point in the source image -
dstPt
- aPoint2D
that represents the location in the destination - Returns:
- the
Point2D
in the destination that corresponds to the specified point in the source.
getRenderingHints
public final RenderingHints 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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Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/image/LookupOp.html