[OpenJDK 2D-Dev] What is the offset-field used for in AATileGenerator.getAlpha?

[Clemens Eisserer]

Hi,

What is the "offset"-field in AATileGenerator.getAlpha used for? The
documentation/pseudo code in AATileGenerator seems to ignore this
parameter.
Does it mean I should rasterize moved by offset?

Thanks in advance, Clemens