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bug#33729: 27.0.50; Partial glyphs not rendered for Gujarati with Harfbu


From: Khaled Hosny
Subject: bug#33729: 27.0.50; Partial glyphs not rendered for Gujarati with Harfbuzz enabled (renders fine using m17n)
Date: Sat, 15 Dec 2018 00:47:43 +0200
User-agent: Mutt/1.11.1 (2018-12-01)

On Fri, Dec 14, 2018 at 03:42:49PM +0200, Eli Zaretskii wrote:
> > Date: Fri, 14 Dec 2018 13:03:16 +0200
> > From: Khaled Hosny <address@hidden>
> > Cc: address@hidden, address@hidden, address@hidden,
> >     address@hidden
> > 
> > > FWIW, I looked at ftfont.c:uni_script, and I cannot find a problem
> > > with it; in particular looking up in char-script-table each character
> > > of the Gujarati welcome in HELLO yields 'gujarati', so I couldn't see
> > > any evident Emacs issue.  Or are you saying that hb_script_from_string
> > > doesn't DTRT?  Or maybe Kaushal should upgrade to a newer version of
> > > HarfBuzz?
> > 
> > There is this FIXME:
> > 
> > /* FIXME: from_string wants an ISO 15924 script tag here. */
> > 
> > As we discussed earlier, hb_script_from_string() expects ISO 15924
> > script tags, but char_script_table does not provide such tags (I don’t
> > recall what it does provide exactly). We need a way to get ISO 15924
> > script tags from Emacs.
> 
> Right, I forgot about that.
> 
> So you are saying that we need to generate Gujr instead of gujarati,
> is that right?

Yes (and the equivalent for all other scripts, of course).

Regards,
Khaled





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