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From: "समीर सिंह Sameer Singh" <lumarzeli30@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Supporting stylistic sets
Date: Sat, 24 Sep 2022 22:39:16 +0530	[thread overview]
Message-ID: <CAOR1sLziWYfxrJp7ccGngg=8eRe9-fbgducKoOQh9_huJ2j0rw@mail.gmail.com> (raw)
In-Reply-To: <83y1u8n414.fsf@gnu.org>

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On Sat, Sep 24, 2022 at 9:44 PM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: समीर सिंह Sameer Singh <lumarzeli30@gmail.com>
> > Date: Sat, 24 Sep 2022 21:20:03 +0530
> > Cc: emacs-devel@gnu.org
> >
> > On Sat, Sep 24, 2022 at 8:52 PM Eli Zaretskii <eliz@gnu.org> wrote:
> >
> >  > From: समीर सिंह Sameer Singh <lumarzeli30@gmail.com>
> >  > Date: Sat, 24 Sep 2022 20:32:26 +0530
> >  > Cc: emacs-devel@gnu.org
> >  >
> >  > no, the same would work
> >
> >  Then I don't understand how will HarfBuzz know to apply the first tag
> >  to 'i', but the second one to 'l'.
> >
> > The font file has a GSUB table for this purpose
>
> I'm sorry, I still don't understand.  (I'm not an expert on fonts, so
> I'd appreciate a slightly more detailed explanations.)  Are you saying
> that each tag can be used by a single character in a font?  IOW, no
> feature tag can ever be shared by two or more characters in a font?
>

IIUC, then yes.


> The HarfBuzz docs says:
>
>   The hb_feature_t is the structure that holds information about
>   requested feature application. The feature will be applied with the
>   given value to all glyphs which are in clusters between start
>   (inclusive) and end (exclusive).
>
> This seems to say that we need to set START and END of each feature to
> buffer positions of the characters to which we want the feature to be
> applied.  That is why I said that START and END should be set
> separately for each feature, according to the positions of the
> corresponding characters in the buffer submitted to hb_shape_full.
>

I don't think that is the case, I have attached a slightly modified
harfbuzz-tutorial[1],
where I have defined four features for a,g,i and l respectively with the
same start and end variables.
It works as expected.

You can provide it with the path to a firacode font file and the text which
it has to display and it will produce a png.

[1] https://github.com/harfbuzz/harfbuzz-tutorial

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  parent reply	other threads:[~2022-09-24 17:09 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-23 12:54 Supporting stylistic sets समीर सिंह Sameer Singh
2022-09-23 15:37 ` Eli Zaretskii
2022-09-23 17:27   ` समीर सिंह Sameer Singh
2022-09-23 17:31     ` Nicolas Ouellet-payeur
2022-09-23 18:09       ` Eli Zaretskii
2022-09-23 19:20         ` Nicolas Ouellet-payeur
2022-09-23 20:10           ` Eli Zaretskii
     [not found]             ` <CADuLPF5sKi4NMcGSdy1GAi8=KHBfUcVa3tV=XwnhPfWxroAJCA@mail.gmail.com>
2022-09-26 17:07               ` Eli Zaretskii
2022-09-26 17:46                 ` Nicolas Ouellet-payeur
2022-09-26 18:28                   ` Eli Zaretskii
2022-09-26 19:06                     ` Yuri Khan
2022-09-26 19:20                       ` Eli Zaretskii
2022-09-23 17:55     ` Eli Zaretskii
2022-09-23 18:26       ` Visuwesh
2022-09-23 18:55         ` Eli Zaretskii
2022-09-24  4:59           ` Visuwesh
2022-09-24  6:33             ` Eli Zaretskii
2022-09-24  8:42               ` Visuwesh
2022-09-24  4:43       ` समीर सिंह Sameer Singh
2022-09-24  6:55         ` Eli Zaretskii
2022-09-24  8:00           ` समीर सिंह Sameer Singh
2022-09-24  8:27             ` Eli Zaretskii
2022-09-24  8:34               ` समीर सिंह Sameer Singh
2022-09-24  8:38                 ` Eli Zaretskii
2022-09-24  8:41                   ` समीर सिंह Sameer Singh
2022-09-24  8:50                   ` समीर सिंह Sameer Singh
2022-09-24 12:09                     ` समीर सिंह Sameer Singh
2022-09-24 12:35                       ` Eli Zaretskii
2022-09-24 12:45                         ` समीर सिंह Sameer Singh
2022-09-24 13:00                           ` Eli Zaretskii
2022-09-24 13:10                             ` समीर सिंह Sameer Singh
2022-09-24 14:18                               ` Eli Zaretskii
2022-09-24 14:26                                 ` समीर सिंह Sameer Singh
2022-09-24 15:01                                   ` Eli Zaretskii
2022-09-24 15:02                                     ` समीर सिंह Sameer Singh
2022-09-24 15:21                                       ` Eli Zaretskii
2022-09-24 15:50                                         ` समीर सिंह Sameer Singh
2022-09-24 16:14                                           ` Eli Zaretskii
2022-09-24 16:42                                             ` Yuri Khan
2022-09-24 17:02                                               ` Eli Zaretskii
2022-09-24 17:09                                             ` समीर सिंह Sameer Singh [this message]
2022-09-24 17:11                                               ` समीर सिंह Sameer Singh
2022-09-25 22:19                                             ` Clément Pit-Claudel

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