[HarfBuzz] Some experiments with harfbuzz/OpenGL

[Khaled Hosny]

On Fri, Apr 12, 2013 at 05:29:07PM -0400, Behdad Esfahbod wrote:
> Looks correct after adding these.  Though, I was under the impression that
> Amiri has much better mark positioning.  Khaled, am I missing anything here?

Are you referring to the fixed Y positions of the marks?
This was a deliberate choice, initially I had them varying as it is the
natural choice, but it resulted in many mark collisions  for fully
vocalised text, and fixing one breaks another. Surprisingly, putting
(most of) the marks on the same Y positions fixes a great deal of those
collisions, see the attached image, though it is in’t any less work than
the other.

I think I went too far, though, some glyph like isolated beh etc. does
not need this, also it sometimes look bad when there is only few marks
in the text, and I'm still looking for a better way to handle both
cases.

Regards,
Khaled
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