2013/2/14 erik quanstrom <quanstro@quanstro.net>

> On Thu Feb 14 13:52:09 EST 2013, yarikos@gmail.com wrote:
>
> > we can't do XOR drawing with draw(2) like with bitblt, can we?
>
> if there's a trivial α channel, it's possible.  otherwise one
> runs the risk of α multiplication.
>
>
No alpha there - I'd like to learn the trick please.