Re: [NTG-context] Hyphenation patterns and adjusted kerning: ConTeXt vs. LuaTeX
On 25-2-2011 1:18, Heilmann, Till A. wrote:
Maybe the ConTeXt community can be of assistance to the LuaTeX bunch ...
As a new LuaTeX user, I came across the following problem: Using Lua(La)TeX,
customized kerning of letter pairs (via the FeatureFile capability of fontspec)
is ignored when it coincides with a possible hyphenation of a word (e.g.
between 'f' and 'h' in German words like 'aufhalten'; see first minimal example
below).
Ulrike Fischer was so kind to point out two things
(http://tug.org/pipermail/luatex/2011-February/002569.html): First, the problem
seems to be the break points between the adjusted kerning pairs. Second,
ConTeXt seems to handle this case correctly (see second minimal example below;
feature file bonum.fea from first example required).
I am no expert in neither LuaTeX nor context, but Ulrike suggested I post here
and ask if the (typographically correct) ConTeXt behavior or solution can be
reproduced with Lua(La)TeX.
Thanks,
- Till
1. Lua(La)TeX
\begin{filecontents*}{bonum.fea}
languagesystem DFLT dflt;
languagesystem latn dflt;
feature kern {
pos f h 100;
} kern;
\end{filecontents*}
\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setmainfont[FeatureFile=bonum.fea]{TeX Gyre Bonum}
\begin{document}
fh aufhalten
\end{document}
I cannot test that (I only have the context minimals installed) but I
don't know anything about latex internals so it would be a wild guess.
Maybe babel is interfering? In base mode kerning and and hyphenation
happen in the traditional tex way, so there is not much extra trickery
taking place.
2. ConTeXt
\mainlanguage [de]
\definefontfeature[test][featurefile=bonum,kern=yes]
\definefont[test][name:texgyrebonum*test]
\starttext
\test fh aufhalten
\stoptext
Indeed I see a kern.
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] Hyphenation patterns and adjusted kerning: ConTeXt vs. LuaTeX
Am Fri, 25 Feb 2011 14:35:10 +0100 schrieb Hans Hagen: As a new LuaTeX user, I came across the following problem: Using Lua(La)TeX, customized kerning of letter pairs (via the FeatureFile capability of fontspec) is ignored when it coincides with a possible hyphenation of a word (e.g. between 'f' and 'h' in German words like 'aufhalten'; see first minimal example below). 1. Lua(La)TeX I cannot test that (I only have the context minimals installed) but I don't know anything about latex internals so it would be a wild guess. Maybe babel is interfering? No, the problem exists also if you only load the german patterns. In base mode kerning and and hyphenation happen in the traditional tex way, so there is not much extra trickery taking place. Well, as you mention base mode: This reminded me that I had to force base mode to get my reencoding to work in latex. So I tried in context + latex/luaotfload (with german hyphenation patterns): \font\test=name:TeX Gyre Bonum:mode=base:featurefile=bonum.fea;+kern and \font\test=name:TeX Gyre Bonum:mode=node:featurefile=bonum.fea;+kern And bingo: with mode=base it works in both formats, with mode=node the kern disappears. Without mode declaration the kern disappears in latex. So I think it isn't true that the manual of luaotfload claims By default mode=base is used. -- Ulrike Fischer ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Hyphenation patterns and adjusted kerning: ConTeXt vs. LuaTeX
Am Fri, 25 Feb 2011 16:37:26 +0100 schrieb Heilmann, Till A.:
Am Fri, 25 Feb 2011 14:41:10 +0100 schrieb Ulrike Fischer:
In base mode kerning and and hyphenation
happen in the traditional tex way, so there is not much extra trickery
taking place.
Well, as you mention base mode: This reminded me that I had to
force base mode to get my reencoding to work in latex. So I tried in
context + latex/luaotfload (with german hyphenation patterns):
[...]
And bingo: with mode=base it works in both formats, with mode=node
the kern disappears. Without mode declaration the kern disappears in
latex.
Ah, yes, the transcript of my first example clearly shows fontspec operating
in node mode.
Please excuse my naive asking: Is there any way to continue using
fontspec's setmainfont command (it is convenient for someone
unexperienced like me) and at the same force luaotfload into
using base mode?
The following seems to work:
\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setmainfont[RawFeature={mode=base},FeatureFile=bonum.fea]{TeX Gyre
Bonum}
\begin{document}
fh aufhalten
\end{document}
--
Ulrike Fischer
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Re: [NTG-context] Hyphenation patterns and adjusted kerning: ConTeXt vs. LuaTeX
Am Fri, 25 Feb 2011 16:45:31 +0100 schrieb Ulrike Fischer:
Ah, yes, the transcript of my first example clearly shows fontspec operating
in node mode.
Yes, but I could also reproduce the problem without fontspec (only
with luaotfload).
Please excuse my naive asking: Is there any way to continue using
fontspec's setmainfont command (it is convenient for someone
unexperienced like me) and at the same force luaotfload into
using base mode?
The following seems to work:
\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setmainfont[RawFeature={mode=base},FeatureFile=bonum.fea]{TeX Gyre
Bonum}
\begin{document}
fh aufhalten
\end{document}
And after a look in the fontspec code:
\setmainfont[Renderer=Basic,FeatureFile=bonum.fea]{TeX Gyre Bonum}
--
Ulrike Fischer
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Re: [NTG-context] Hyphenation patterns and adjusted kerning: ConTeXt vs. LuaTeX
On Fri, Feb 25, 2011 at 03:41:10PM +0100, Ulrike Fischer wrote: So I think it isn't true that the manual of luaotfload claims By default mode=base is used. It used to be like that but we changed it a while ago, looks like I didn't update the manual. Regards, Khaled -- Khaled Hosny Egyptian Arab ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Hyphenation patterns and adjusted kerning:?ConTeXt vs. LuaTeX
On Fri, Feb 25, 2011 at 04:45:31PM +0100, Ulrike Fischer wrote:
Ah, yes, the transcript of my first example clearly shows fontspec
operating in node mode.
Please excuse my naive asking: Is there any way to continue using
fontspec's setmainfont command (it is convenient for someone
unexperienced like me) and at the same force luaotfload into
using base mode?
The following seems to work:
\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setmainfont[RawFeature={mode=base},FeatureFile=bonum.fea]{TeX Gyre Bonum}
Better Renderer=Basic.
--
Khaled Hosny
Egyptian
Arab
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