Hi,
I’ve reread
http://cgit.freedesktop.org/harfbuzz/commit/?id=607feb7cff0e50f8738d2e49ca463fc9d7d494de
several times now. I don’t understand why ZWNJ should be ignored in
chaining contextual environments. Especially. if lookups include ZWNJ it
shouldn’t be ignored. Although some features may be called something
with ligature, it’s not mandatory that their lookups be ligature
lookups. IMO, it’s not very strange to think of contextual lookups in a
liga feature.
Best regards,
Georg
Am 2013-04-28 23:27, schrieb Georg Duffner:
Hi,
I posted this on the XeTeX list. Khaled meant it could have something to
do with
http://cgit.freedesktop.org/harfbuzz/commit/?id=607feb7cff0e50f8738d2e49ca463fc9d7d494de
Recently I’ve changed the behaviour of liga. The f-ligatures are now
formed by component glyphs which get substituted by means of contextual
chaining lookups. Thus, instead of
sub f f by f_f; the lookup is now sub f' f by f._f;
This way I need much less glyphs in the font and it’s much easier to
produce the whole range of ligatures.
-------- Original-Nachricht --------
Betreff: ZWNJ is being ignored
Datum: Sun, 28 Apr 2013 14:56:11 +0200
Von: Georg Duffner <[email protected]>
An: [email protected] >> Unicode-based TeX for Mac OS X and other platforms
<[email protected]>
Hi,
I’ve run across a bug in v.0.9999.0 from tlcontrib and I’d like to know
if this is still true:
XeTeX 0.9999.0 ignores uni200C (zero width non joiner) with latin
script. It is needed for inhibiting ligatures at certain places in
german. Babel provides a shorthand for this purpose ("|) which inserts a
tiny kern between the two letters but that prevents contextual lookups.
If I insert a ZWNJ at that place, the ligature substitution takes place
nevertheless.
In EB Garamond this matters because there are two differently shaped
"f"s and I want two non ligated "f"s following each other to take the
same shape. LuaTeX and FF21 do this correctly (see:
http://georgduffner.at/ebgaramond/tests/zwnj.html).
The minimal example contains different ways of (not) breaking up
ligatures. The last two contain the ZWNJ character. Please use this
version of the font:
http://georgduffner.at/ebgaramond/fonts/EBGaramond12-Regular.otf
\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont{EB Garamond}
\usepackage[german]{babel}
%\defineshorthand{"|}{\char"200C}
\begin{document}
\addfontfeature{Language=German}
auffallend auffällig\\
auf"|fallend auf"|fällig\\
auf\/fallend auf\/fällig\\
auf{}fallend auf{}fällig\\
auf\char"200C fallend auf\char"200C fällig\\
auffallend auffällig
\end{document}
Best regards,
Georg
--
EB Garamond: http://www.georgduffner.at/ebgaramond
_______________________________________________
HarfBuzz mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/harfbuzz
