[JAVA2D] Accessing Rasters

[Mark McKay]

I need to implement a 'multiply' method for a filled shape, and figured
the best way to do this is by extending Composite.  I've done this, and
also created a CompositeContext class that will perform the actual work
of composition my shape with the background.  However, I don't know very
much about rasters.
The CompositeContext interface provides me with the method

   public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
   {
   }

Somehow I need to determine the RGBA values of each pixel in src and
dstIn, perform a calculation, and write the result to the coresposding
pixel in dstOut.  These rasters should have the same dimensions.
The interface methods also provide me with a ColorModel srcColorModel
and a ColorModel dstColorModel.
Any idea what I can do?  I can't figure out how to convert a Raster and
a ColorModel into RGBA.
Mark McKay

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