[Freetype] Extracting kerning info from OpenType fonts

[Marco Kuhlmann]

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    Hi there!

I ran into problems today when trying to write my first little freetype 
application: I was unsuccessful in extracting the kerning information from 
an OpenType font (Adobe Minion Pro) -- neither FT_HAS_KERNING nor 
FT_Get_Kerning indicate that there is any kerning at all.  (Although I 
know there is. :-)

I had a look at the sources and found that only the first kerning table 
with format 0 seems to be loaded by tt_face_load_kern.  There's a remark 
there that there is a possibility to access other kerning tables apart 
from the default one (it's called the 'ftxkern' extension), but I could 
not find any other reference to that interface in the sources.

Now my questions: Is FreeType capable of extracting OpenType metrics?  Can 
I use the default mechanism, or do I need some extra magic?

    Thanks,
    Marco

PS. I am attaching my test file, in case I am just incapable of writing C 
or using your API (both of which could be possible).
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test.c
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