[Cairo] Color transforms

[Carl Worth]

On Jul 16, Bill Spitzak wrote:
 > So is it possible to decompose the curve into line segments without having to 
 > know if it is going to be stroked or filled or knowing the line thickness, as 
 > long as the resulting line joins can be marked whether they are this new type 
 > or not?

Not having tried it yet, I think so. But there may be a hidden issue
or two lurking here.

-Carl