[cairo] Bad line joins/cap with ROUND

[Behdad Esfahbod]

Chris Wilson wrote:
> Currently when constructing the fan for a ROUND line join/cap we do not
> correctly select the termination vertices and sometime choose a vertex
> that lies inside the current stroke.

IIRC the solution before was to compute the convex hull of the join then...


> See the attached bad-line-join.

Wow, those images are amazing!

behdad

> The solution for a water-tight closure of the fan is to include the
> termination points in the pen. good-line-join shows the result of
> applying the path.
> 
> Carl, is this worthy for 1.8? It doesn't address any outstanding issues
> but it makes twin look better.
> 
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