[cairo] [PATCH] [Cairomm] Allow creation of SVG/PDF/PS surfaces without specifing a file name

[Patrick Niklaus]

Hey,

cairomm currently does not allow to create PngSurface, SvgSurface and
PsSurface without specifying a file name or a write function. However
the cairo API allows this by passing NULL as file name. [1]

This is a simple patch to add this functionality to cairomm.

Regards,
Patrick

[1] http://www.cairographics.org/manual/cairo-SVG-Surfaces.html#cairo-svg-surface-create
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