| javax.media.jai.OpImage
 javax.media.jai.PointOpImage
com.sun.media.jai.opimage.CompositeOpImage
| CompositeOpImage | | final class CompositeOpImage extends PointOpImage (Code) | | An OpImage implementing the "Composite" operation as
described in javax.media.jai.operator.CompositeDescriptor.
For two source images src1 and src2,
this OpImage places the foreground src1
in front of the background src2. This is what commonly
known as the "over" composite.
The destination image contains both the alpha channel and the
color channels. The alpha channel index is determined by the parameter
alphaFirst: if true, alpha is the first channel; if false,
alpha is the last channel. The formulas used to calculate destination
alpha and color values are:
dstAlpha = src1Alpha + src2Alpha * (1 - src1Alpha)
dstColor = src1Color + src2Color * (1 - src1Alpha)
where alpha values are in fraction format, and color values are alpha
pre-multiplied.
The following assumptions are made:
The source images, their alpha images, and the destination image all
have the same data type.
The two source images have the same number of bands and should only
contain the color channels.
The alpha images are of the same dimension as their cooresponding source
image and should be single-banded. If a multi-banded image is supplied, the
default band (band 0) is used.
If alphaPremultiplied is true, both the source and
destination images have alpha pre-multiplied, and vice versa.
The destination image must have at least one extra band than the two
sources, which represents the alpha channel. It may be user-specified
to be the first or the last band of the pixel data.
See Also: javax.media.jai.operator.CompositeDescriptor
See Also: CompositeCRIF |
| Field Summary | |
| protected boolean | alphaPremultiplied
Indicates whether alpha has been premultiplied. | | protected RenderedImage | source1Alpha
The alpha image that overrides the alpha for source1. | | protected RenderedImage | source2Alpha
The alpha image that overrides the alpha for source2. |
| Constructor Summary | |
| public | CompositeOpImage(RenderedImage source1, RenderedImage source2, Map config, ImageLayout layout, RenderedImage source1Alpha, RenderedImage source2Alpha, boolean alphaPremultiplied, boolean alphaFirst)
Constructs an CompositeOpImage. |
| Method Summary | |
| protected void | computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)
Composites two images within a specified rectangle. |
| alphaPremultiplied | | protected boolean alphaPremultiplied(Code) | | Indicates whether alpha has been premultiplied.
|
| source1Alpha | | protected RenderedImage source1Alpha(Code) | | The alpha image that overrides the alpha for source1.
|
| source2Alpha | | protected RenderedImage source2Alpha(Code) | | The alpha image that overrides the alpha for source2.
|
| CompositeOpImage | | public CompositeOpImage(RenderedImage source1, RenderedImage source2, Map config, ImageLayout layout, RenderedImage source1Alpha, RenderedImage source2Alpha, boolean alphaPremultiplied, boolean alphaFirst)(Code) | | Constructs an CompositeOpImage.
Parameters:
source1 - The foreground source image.
Parameters:
source2 - The background source image.
Parameters:
layout - The destination image layout.
Parameters:
source1Alpha - The alpha image that overrides thealpha for source1; may not be null.
Parameters:
source2Alpha - The alpha image that overrides the alpha forsource2; may be null, in which case source2is considered completely opaque.
Parameters:
alphaPremultiplied - Indicates whether alpha has beenpremultiplied to both sources.
Parameters:
alphaFirst - If true, alpha is the first band (band 0) indestination image; if false, alpha is thelast band. |
| computeRect | | protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code) | | Composites two images within a specified rectangle.
Parameters:
sources - Cobbled source, guaranteed to provide all thesource data necessary for computing the rectangle.
Parameters:
dest - The tile containing the rectangle to be computed.
Parameters:
destRect - The rectangle within the tile to be computed. |
| Methods inherited from javax.media.jai.OpImage | protected void addTileToCache(int tileX, int tileY, Raster tile)(Code)(Java Doc)
public void cancelTiles(TileRequest request, Point[] tileIndices)(Code)(Java Doc)
protected void computeRect(Raster[] sources, WritableRaster dest, Rectangle destRect)(Code)(Java Doc)
protected void computeRect(PlanarImage[] sources, WritableRaster dest, Rectangle destRect)(Code)(Java Doc)
public Raster computeTile(int tileX, int tileY)(Code)(Java Doc)
public boolean computesUniqueTiles()(Code)(Java Doc)
final protected WritableRaster createTile(int tileX, int tileY)(Code)(Java Doc)
public synchronized void dispose()(Code)(Java Doc)
public static int getExpandedNumBands(SampleModel sampleModel, ColorModel colorModel)(Code)(Java Doc)
protected synchronized RasterFormatTag[] getFormatTags()(Code)(Java Doc)
public int getOperationComputeType()(Code)(Java Doc)
public Raster getTile(int tileX, int tileY)(Code)(Java Doc)
public TileCache getTileCache()(Code)(Java Doc)
public Object getTileCacheMetric()(Code)(Java Doc)
public Point[] getTileDependencies(int tileX, int tileY, int sourceIndex)(Code)(Java Doc)
protected Raster getTileFromCache(int tileX, int tileY)(Code)(Java Doc)
public TileRecycler getTileRecycler()(Code)(Java Doc)
public Raster[] getTiles(Point[] tileIndices)(Code)(Java Doc)
public boolean hasExtender(int sourceIndex)(Code)(Java Doc)
public Point2D mapDestPoint(Point2D destPt, int sourceIndex)(Code)(Java Doc)
abstract public Rectangle mapDestRect(Rectangle destRect, int sourceIndex)(Code)(Java Doc)
public Point2D mapSourcePoint(Point2D sourcePt, int sourceIndex)(Code)(Java Doc)
abstract public Rectangle mapSourceRect(Rectangle sourceRect, int sourceIndex)(Code)(Java Doc)
public void prefetchTiles(Point[] tileIndices)(Code)(Java Doc)
public TileRequest queueTiles(Point[] tileIndices)(Code)(Java Doc)
protected void recycleTile(Raster tile)(Code)(Java Doc)
public void setTileCache(TileCache cache)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image1, RenderedImage image2)(Code)(Java Doc)
protected static Vector vectorize(RenderedImage image1, RenderedImage image2, RenderedImage image3)(Code)(Java Doc)
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