[cairo] API request: obtain the trapezoids that are outside of the surface

[Keith Packard]

Around 21 o'clock on Aug 17, =?iso-8859-1?q?Jost=20Boekemeier?= wrote:

> Not without tesselating.  For example even if all the
> base points of a spline are inside, that does not
> necessarily mean that the whole spline is inside.

One of the features of Bézier splines is that the control points form a 
bounding polygon for the spline.  It's not true for many other spline 
represenatations, but it was one of the reasons we chose this particular 
form.

-keith


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