[Freetype] Caching questions

[Shoms W]

Hello All,
I am using the cache subsystem of freetype and have a few questions about 
it. After I initialize everything, and and get a bitmap descriptor from a 
FTC_SBitCache_Lookup I would like to do some kerning using the function 
FT_Get_Kerning(face, previous, glyph_index,ft_kerning_mode_default, &delta ) 
which I assume does the needful. However, when I call the function with the 
proper parameters, I always get delta.x as 0.
Am I doing something wrong. Can I use the FT_Get_Kerning function when using 
the cache-sub system? The FT_HAS_KERNING(face) is true. I am drawing a 
blank, and any help would be appreciated.
The font that I am testing with is arial.ttf
Thanks,
Shoms

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