I can't speak to the technical questions, but I see the appeal of this
idea. Cairo looks like a mature, well-supported, and widely-used library.
https://en.wikipedia.org/wiki/Cairo_%28graphics%29
Interestingly, "Cairo uses hardware acceleration
<https://en.wikipedia.org/wiki/Hardware_acceleration>^[3]
<https://en.wikipedia.org/wiki/Cairo_%28graphics%29#cite_note-3> when
available."
I see that it can produce Postscript as well as PDF, among its various
backends. "The vector graphics application Inkscape
<https://en.wikipedia.org/wiki/Inkscape> uses the Cairo library for its
outline mode display, as well as for PDF
<https://en.wikipedia.org/wiki/Portable_Document_Format> and PostScript
<https://en.wikipedia.org/wiki/PostScript> export..."
-Paul
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