[HarfBuzz] Support for optical 'opdb' feature(s)

[Khaled Hosny]

On Sat, Mar 16, 2013 at 12:24:30AM +0200, Khaled Hosny wrote:
> So I’m asking if HarfBuzz can provide an API to retrieve optical bounds,
> something like:
> 
> hb_ot_layout_get_glyph_optical_bounds (face, gid, side)
>   if side == left:
>      query ‘ltbd’
>   else if side == right
>      query ‘rtbd’

Those are regular GPOS features of course, so we will have to pass
script and language to that hypothetical API call.

Regards,
Khaled