[HarfBuzz] HB coretext_aat shaper?

Adam Twardoch (List) list.adam at twardoch.com
Tue Mar 17 18:33:43 PDT 2015

So actually, if I use the "coretext" shaper, then it doesn't really matter whether the font has GSUB/GPOS or morx/kerx, because HB takes OT-lingo feature spec, translates it to the AAT feature spec, and just calls CoreText, and CoreText itself decides "what to do" with the AAT feature spec, i.e. whether to use these features directly with morx/kerx or internally translate it back to OT tags and use GSUB/GPOS. 



> On 18 Mar 2015, at 01:36, Behdad Esfahbod <behdad.esfahbod at gmail.com> wrote:
> On 15-03-17 05:27 PM, Adam Twardoch (List) wrote:
>> Behdad, 
>> What functionality does the coretext_aat shaper currently support?
> What the coretext_aat does is: if the font has 'mort' or 'morx' table, then
> call the coretext shaper, otherwise fail (and let ot shaper handle).  It's
> just a mechanism to choose which shaper to use.
>> I can see that it does something with "mort" and "morx", but possibly not "kerx" or the extended "kern" table? Or does it? With something like hb-view, which options (if any) are passed on? Direction, script, language, features? 
> Everything is supported.
>> Thanks,
>> A.
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