[HarfBuzz] How many unicode make up a glyph?

[ff.feng at Sunmedia.com.cn]

Hi !

I'm developing a font engine with harfbuzz & freetype for Cambodia. 
I can get the correct glyph index array and position array by harfbuzz. 
That's sweet.

Now I got a problem : I'm wondering how many unicode(UTF16) form a glyph?
(If I specify a item in the glyph index array from 
hb_buffer_get_glyph_infos)

thanks a lot & sorry for my poor English.


Best regards,

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