[HarfBuzz] How to use 'locl' feature of Noto Sans CJK with Harfbuzz?

[Behdad Esfahbod]

On 15-05-06 04:14 PM, Richard Wordingham wrote:
> On Wed, 6 May 2015 23:30:20 +0200
> "Adam Twardoch (List)" <list.adam at twardoch.com> wrote:
> 
>> 2. For the language tags, one should use high-level ISO-style
>> language tags, while the low-level OT languagesystem tags "might"
>> work, but it's not recommended to use them. 
> 
> My mistake.  The code I suggested shouldn't even compile.  One should
> use hb_language_from_string(). However, I don't know what one should
> use if there isn't a language associated with the 'language system'.  I
> suppose a good example would be special glyph shapes for IPA or APA.

That can be done using the "x-hbotXXX" extension.  See my other messages.


> Incidentally, looking at hb-ot-tag.cc, what's the big problem with the
> Chin and Cree languages?  The Cree styles are heavily split, while a
> single style is assumed to suffice for the various Chin languages and
> the northern Athabascan languages.  The standard has not been fully
> updated for splitting off some of the Athabscan languages!  Or is one
> supposed to look for a Navajo language-system for Navajo, and on not
> finding it, look for a general Athabascan language-system?  I did note
> that there are some problems where Microsoft splits languages more
> finely than ISO 693 - translating language naming systems has some of
> the problems of translating natural languages!

Since we have everyone's attention, lets do a cleanup of that list in light of
new OpenType 1.7 language tags.  Arthur already volunteered (off-list) to send
a Pull Request, and we can all refine it there.

Thanks,

behdad