Thanks. I could manage to do this by using ucdn_get_script() for now. BiDi is going to be the next big challenge.
-- Lóránt Pintér Developer at Prezi (http://prezi.com) On Sunday, April 7, 2013 at 1:55 PM, Khaled Hosny wrote: > On Sun, Apr 07, 2013 at 02:59:32AM +0200, Lóránt Pintér wrote: > > 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. > > > > > You have to split the text runs before passing them to HarfBuzz, etch > run should have the same script/language and text direction. > > Ideally text should be first itemized into runs with the same script, > and further split them into directional run according to BiDi algorithm. > > There are of course more subtleties involved, like when using multiple > fonts etc. > > Regards, > Khaled > >
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