[cairo] Fill+stroke optimisation for the SVG backend

[Emmanuel Pacaud]

Hi,

I've recently tried to optimize the output of the SVG backend in the
case of consecutive calls to fill and stroke with the same path, and
only emit one <path> element in this case.

I've begun this work in working only on the SVG backend code, but
changed my mind and done it at the meta-surface level, hoping that could
benefit to the other vector backends.

The result of this work is in the fill-stroke branch in this repository:

git://people.freedesktop.org/~emmanuel/cairo

The thing I don't like in what I've done is the new fill-stroke backend
method, which seems redundant with the two other fill and stroke
methods. And also I wonder if this optimisation makes sense for the PDF
and PS backends. Is it possible to use the same path data for fill and
stroke in a PDF or PS file ?

Any comments ?

	Emmanuel.