[HarfBuzz] HB coretext_aat shaper?
Adam Twardoch (List)
list.adam at twardoch.com
Tue Mar 17 17:48:32 PDT 2015
> 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:
>> 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 see. In this case, I'd recommend adding a check for the "kerx" table. One can think of an AAT font that has "kerx" but no "morx" or "mort".
>> 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.
I see. So you specify the features using OpenType Layout "lingo", then the feature tags get converted to AAT feature types using the the feature_mappings table in hb-coretext.cc, and then those AAT feature types are passed on to CoreText?
And that means that the feature tags which are listed in
but are not in hb-coretext.cc feature_mappings (i.e. they don't translate to OT feature tags) cannot be accessed, correct?
(I'm not saying this is particularly troubling :) ).
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