[Groff] ditroff+eqn as a library

[Michail Vidiassov]

Dear All,

it is a somewhat offtopic question, but
what cross-platform libraries for device-independent typesetting are here?

The question arises from dealing with text output in cross-platform
3D library. It has its own polygon fonts and may use platform fonts or 
fonts from file and is able to output strings of text with that fonts.
What is necessary is something to take a set of fonts descriptions 
and a string with formatting instructions in it and give a set of 
commands - move there, print such glyph/character from such font.

That looks very much like what ditroff (whatever its current name) does.
While writing a device driver for ditroff may be possible,
piping things here and there is not the best option for a library that may
be used not only in batch mode and where intellegent recovery from 
typesetting failures is desired.

Thus the question - is there any ditroff-like light-weight cross-platform 
library out there on the Internet?

       Sincerely, Michail