| java.lang.Object
 java.awt.image.LookupOp
| LookupOp | | public class LookupOp implements BufferedImageOp,RasterOp(Code) | | 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.
version:
10 Feb 1997
See Also: LookupTable
See Also: java.awt.RenderingHints.KEY_COLOR_RENDERING
See Also: java.awt.RenderingHints.KEY_DITHERING |
| Constructor Summary | |
| public | LookupOp(LookupTable lookup, RenderingHints hints)
Constructs a LookupOp object given the lookup
table and a RenderingHints object, which might
be null. |
| LookupOp | | public LookupOp(LookupTable lookup, RenderingHints hints)(Code) | | Constructs a LookupOp object given the lookup
table and a RenderingHints object, which might
be null.
Parameters:
lookup - the specified LookupTable
Parameters:
hints - the specified RenderingHints,or null |
| createCompatibleDestImage | | public BufferedImage createCompatibleDestImage(BufferedImage src, ColorModel destCM)(Code) | | Creates a zeroed destination image with the correct size and number of
bands. If destCM is null, an appropriate
ColorModel will be used.
Parameters:
src - Source image for the filter operation.
Parameters:
destCM - the destination's ColorModel, which can be null. a filtered destination BufferedImage. |
| createCompatibleDestRaster | | public WritableRaster createCompatibleDestRaster(Raster src)(Code) | | Creates a zeroed-destination Raster with the
correct size and number of bands, given this source.
Parameters:
src - the Raster to be transformed the zeroed-destination Raster. |
| filter | | final public BufferedImage filter(BufferedImage src, BufferedImage dst)(Code) | | 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.
Parameters:
src - the BufferedImage to be filtered
Parameters:
dst - the BufferedImage in which to store the results of the filter operation the filtered BufferedImage.
throws:
IllegalArgumentException - if the number of arrays in theLookupTable does not meet the restrictionsdescribed in the class comments, or if the source imagehas an IndexColorModel. |
| filter | | final public WritableRaster filter(Raster src, WritableRaster dst)(Code) | | 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.
Parameters:
src - the source Raster to filter
Parameters:
dst - the destination WritableRaster for thefiltered src the filtered WritableRaster.
throws:
IllegalArgumentException - if the source and destinations rasters do not have the same number of bands, or thenumber of arrays in the LookupTable does not meet the restrictions described in the class comments. |
| getBounds2D | | final public Rectangle2D getBounds2D(BufferedImage src)(Code) | | Returns the bounding box of the filtered destination image. Since
this is not a geometric operation, the bounding box does not
change.
Parameters:
src - the BufferedImage to be filtered the bounds of the filtered definition image. |
| getBounds2D | | final public Rectangle2D getBounds2D(Raster src)(Code) | | Returns the bounding box of the filtered destination Raster. Since
this is not a geometric operation, the bounding box does not
change.
Parameters:
src - the Raster to be filtered the bounds of the filtered definition Raster. |
| getPoint2D | | final public Point2D getPoint2D(Point2D srcPt, Point2D dstPt)(Code) | | 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.
Parameters:
srcPt - a Point2D that represents a pointin the source image
Parameters:
dstPt - a Point2Dthat represents the locationin the destination the Point2D in the destination that corresponds to the specified point in the source. |
| getRenderingHints | | final public RenderingHints getRenderingHints()(Code) | | Returns the rendering hints for this op.
the RenderingHints object associatedwith this op. |
| getTable | | final public LookupTable getTable()(Code) | | Returns the LookupTable.
the LookupTable of thisLookupOp. |
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