[cairo] how to interprete extents of rotated path

[Theo Veenker]

Hi,

I'm trying to get the bounding box of a path using cairo_stroke_extents().
The returned numbers are OK when the path is not rotated, but when it is
rotated the bounding box returned doesn't make sense to me.
See http://www.let.uu.nl/~Theo.Veenker/personal/extents/ for my test
program and two images.

What am I doing wrong here?

Theo