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


From: Eli Zaretskii
Subject: bug#33729: 27.0.50; Partial glyphs not rendered for Gujarati with Harfbuzz enabled (renders fine using m17n)
Date: Sun, 23 Dec 2018 05:34:04 +0200

> Date: Sat, 22 Dec 2018 22:59:48 +0200
> From: Khaled Hosny <address@hidden>
> Cc: address@hidden, address@hidden, address@hidden,
>       address@hidden, address@hidden
> 
> On Sat, Dec 22, 2018 at 09:38:43PM +0200, Eli Zaretskii wrote:
> > > Date: Sat, 22 Dec 2018 17:49:45 +0200
> > > From: Khaled Hosny <address@hidden>
> > > Cc: address@hidden, address@hidden, address@hidden,
> > >   address@hidden, address@hidden
> > > 
> > > Yes, the standard Unicode composition and decomposition. HarfBuzz uses
> > > these during shaping (it prefers composed form for a given sequence if
> > > supported by the font, and falls back to decomposed form otherwise).
> > 
> > Btw, how is this problem solved in the other projects that use
> > Harfuzz?  Does every project need to provide this functionality, or
> > does Harfuzz have it built-in, like with the script tags?  If there's
> > built-in support for this, perhaps Emacs could just use that?
> 
> There is built-in support, and currently we are using that. I can just
> remove the FIXME.

Are there any disadvantages in using the built-in support?  I mean,
why did you envision an Emacs-specific implementation in the first
place?

Thanks.





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