[cairo] defining CLAMP extend mode

[Owen Taylor]

On Mon, 2006-10-23 at 16:15 -0700, Bill Spitzak wrote:

> > The behavior you are asking for is not implementable as sampling if you
> > are doing antialiasing by any means other than super-sampling.
> 
> Not sure I understand this. If my plan cannot be done then multiplying 
> two masks cannot be done.

You can't generally multiply two masks. We get away with it a lot in
Cairo because it works OK as long as the two masks don't share an
anti-aliased contour.

						- Owen