[HarfBuzz] Shaping different scripts in the same text run

[Konstantin Ritt]

Identify script/bidi runs yourself and ask Harfbuzz to shape each run
one-by-one.

Konstantin


2013/4/7 Lóránt Pintér <lorant.pinter at prezi.com>

>  Hi,
>
> I'm struggling with the problem of shaping mixed text. Say I have Thai and
> English text that I would like to shape. If I put all of it in a buffer,
> HarfBuzz chooses a shaper based on the first identifiable character, and
> then uses that shaper for the whole text. So "<thai><english>" gets shaped
> fine with the Thai shaper, but "<english><thai>" gets messed up because it
> is shaped with the default shaper.
>
> I was trying to figure out how Pango does this, but found nothing yet.
>
> Is it possible to ask HarfBuzz to identify text runs inside a buffer (or
> some other way) that can be shaped with different shapers? If there was a
> call that would identify the script (and maybe writing direction) of each
> character in the input, then I could split the buffer at positions where
> these a different script is used.
>
> Thanks.
>
> --
>
> *Lóránt Pintér*
>
> Developer at Prezi <http://prezi.com>
>
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>
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