Pango/Cairo with OpenType handling

[Jeremy Smith <jeremy pinacol com>]

I'm trying to figure out how to use the OpenType font handling functions 
as described here:
<http://library.gnome.org/devel/pango/unstable/pango-OpenType-Font-Handling.html>

The problem is that in order to do anything with OpenType, I first need 
to get a PangoOTInfo.  I can only get a PangoOTInfo if I have an 
FT_Face, which is specific to FreeType.  I want to use Cairo as the 
backend.  Is this possible?  I can't seem to figure out any way of 
getting a valid FT_Face without using FreeType or Xft.

If anyone could just tell me the simplest way to get an FT_Face, that 
would be perfect.  I've tried using pango_font_map_load_font() to get a 
PangoFont, then passing that to pango_ft2_font_get_face() (which is 
deprecated), but I get a warning about how the font is not valid:

Pango-WARNING **: pango_ft2_font_get_face called with bad font, expect 
ugly output

So clearly I'm doing something wrong.

Thanks for any advice (I'm brand new to using Pango, as you can probably 
tell)
Jeremy