Sorry it has taken me so long to get back to you all however I am in the middle of exam season and so time is scarce.
For the most part the (current) code is agnostic with regards to the rendering backend. The only real functionality required is the ability to draw lines and plot glyphs (which includes getting extents). As a result there currently exists support for many backends. I see no reason why a production-ready version of the library will not provide the same.
However, my primary focus will be on Cairo and Qt backends. These are widely used, allow for high quality output in various formats (PDF, PNG and SVG being the big three) and are well tested.
The lack of a C++/C library should not be a major issue. Python is very well established in the fields that the library is likely to be of most use (web, graphing, visualisation) and where it isn't there will most certainly be a command-line tool
PGP.sig (194 Bytes)