[HarfBuzz] HarfBuzz shaping of R2L text

[Eli Zaretskii]

> Date: Sun, 2 Jun 2019 20:29:15 +0100
> From: Richard Wordingham <richard.wordingham at ntlworld.com>
> Cc: harfbuzz at lists.freedesktop.org
> 
> On Sun, 02 Jun 2019 21:01:35 +0300
> Eli Zaretskii <eliz at gnu.org> wrote:
> 
> > The version of HarfBuzz I built on Windows and am using with Emacs has
> > Graphite support, so I reckon I don't have to worry about picking up a
> > Graphite shaper?
> 
> It depends what you want to do with the shaper.  If you want to study
> what it does in the way of sequencing the glyphs, you need to ensure
> you use the shaper you want to study!  The order the glyphs are
> presented to the renderer may be very different between using a
> Graphite shaper and using the HarfBuzz OpenType shaper.  For one thing,
> swapping glyphs round is easy in Graphite and complicated in OpenType.

I don't think I understand what you mean by "Graphite shaper".  I'm
using just HarfBuzz (which has Graphite capabilities); no other shaper
is involved.