[HarfBuzz] Support for Stylistic Sets

[Nikolay Sivov]

On Sun, Sep 15, 2019 at 5:33 AM Eli Zaretskii <eliz at gnu.org> wrote:

> > Date: Sat, 14 Sep 2019 21:33:00 +0100
> > From: Richard Wordingham <richard.wordingham at ntlworld.com>
> > Cc: harfbuzz at lists.freedesktop.org
> >
> > On Sat, 14 Sep 2019 21:15:04 +0300
> > Eli Zaretskii <eliz at gnu.org> wrote:
> >
> > > > Date: Sat, 14 Sep 2019 18:13:25 +0100
> > > > From: Richard Wordingham <richard.wordingham at ntlworld.com>
> > > >
> > > > I think it's safe to specify the use of unsupported features, in
> > > > which case this is a luxury feature.
> > >
> > > you mean, specifying an unsupported feature will not cause hb_shape to
> > > fail, but instead just use the nominal glyphs?
> >
> > Essentially yes, i.e. unsupported features will simply be ignored.
>
> Then there's no need to know whether a feature is supported.  Thanks.
>

MS Word for example shows a preview for each support ssXX feature, and user
can select one they want.

I don't know how (or why) you plan to use that for emacs, but you'll need
to have some logic to figure out which one to enable.


>
> > > Emacs currently leaves it to HarfBuzz to guess the language, so I
> > > don't think this is an issue.
> >
> > Does HarfBuzz guess the language?
>
> Yes.
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