GNU bug report logs - #33729
27.0.50; Partial glyphs not rendered for Gujarati with Harfbuzz enabled (renders fine using m17n)

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Message #50 received at 33729 <at> debbugs.gnu.org (full text, mbox):

From: Benjamin Riefenstahl <b.riefenstahl <at> turtle-trading.net>
To: Khaled Hosny <dr.khaled.hosny <at> gmail.com>
Cc: behdad <at> behdad.org, Eli Zaretskii <eliz <at> gnu.org>, 33729 <at> debbugs.gnu.org,
 far.nasiri.m <at> gmail.com, kaushal.modi <at> gmail.com
Subject: Re: bug#33729: 27.0.50;
 Partial glyphs not rendered for Gujarati with Harfbuzz enabled
 (renders fine using m17n)
Date: Sun, 16 Dec 2018 15:47:56 +0100

Khaled Hosny writes:
> /* 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.

The same mismatch also prevents Syriac text from actually shaping.
Syriac shaping works in m17n with the required setup in
composition-function-table and using the Meltho fonts.  With Harfbuzz it
doesn't work, unless I change "syriac" to "syrc" in charscript.el, just
for testing of course.

As a success story OTOH, Mandaic, using the Noto font, works OOTB ;-)

benny

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