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

Jim Graham Jim.A.Graham at Sun.COM
Mon Sep 14 06:07:01 UTC 2009

It is the offset into the output array of where to put the tile data. 
The pseudo-code in the class comments doesn't necessarily ignore it so 
much as it passes it as 0 since it needs the data placed into the 
beginning of the array and then it immediately processes the data before 
getting the next tile.

It will likely be 0 in most circumstances where we tend to handle each 
tile of data as it is produced, but the parameter is there in case in 
the future someone might want to call a tile generator and have it put 
all of the data into a single array big enough to hold all of the tiles 
and then batch process all of the tile data all at once (or in larger 
batches then once per tile)...


Clemens Eisserer wrote:
> 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

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