[HarfBuzz] How to get hb_face_t and hb_font_t without Freetype?

[Eli Zaretskii]

> From: Behdad Esfahbod <behdad at behdad.org>
> Date: Sat, 11 May 2019 12:25:57 -0700
> Cc: Jonathan Kew <jfkthame at gmail.com>, 
> 	"harfbuzz at lists.freedesktop.org" <harfbuzz at lists.freedesktop.org>
> 
> you can even implement Windows-backed font-funcs.  Several projects
> do that.  Say, look at Qt maybe? 

I looked at XeTeX, but it goes the Freetype way.  I'll look at Qt,
thanks.