[cairo] Making cairo_meta_surface public

[Dominic Lachowicz]

For a variety of reasons, it would be useful to render (say, an SVG)
to an intermediate surface and then replay that intermediate surface
onto target surfaces repeatedly rather than rendering directly onto
the target surfaces. This is analogous to Win32's
Create[Enh]MetaFile() and Play[Enh]MetaFile() commands. Cairo has the
desired functionality built in, but it is currently private. I was
wondering how people feel about making the interface public. All that
I'd currently need are cairo_meta_surface_create() and
cairo_meta_surface_replay ().

Best,
Dom
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