[cairo] Re: Using ADD operator to prevent seams

[Robert O'Callahan]

Actually, we probably want to identify edges that *cannot* be adjacent
to other edges (e.g., anything that's not a straight line, and all
text) and continue to do coverage-based antialiasing on those. So we'd
still want an A8 buffer, but with the ability to do aliased strokes
and fills.

Rob
-- 
["Therefore, my dear friends, as you have always obeyed–not only in my
presence, but now much more in my absence–continue to work out your
salvation with fear and trembling, for it is God who works in you to will
and to act according to his good purpose." Philippians 2:12-13.]