[cairo] render text along path

[Dirk Schönberger]

> Pycairo comes with the example examples/warpedtext.py which draws text
> along a path.
>

The example looks interesting.
The only problem I see is that this method warps the actual glyphs.
In a pure text on path I think the glyphs should be only rotated,
transformed or scaled, while the actual "point data" (outlines) are not
changed.

Regards
Dirk