[lltx] [luaotfload] Footnotes

[Khaled Hosny]

On Thu, Apr 08, 2010 at 11:58:32AM +0200, Georg A. Duffner wrote:
> Am 2010-04-08 01:16, schrieb Khaled Hosny:
> >On Wed, Apr 07, 2010 at 11:08:23PM +0200, Georg A. Duffner wrote:
> >>Am 2010-04-07 11:55, schrieb Khaled Hosny:
> >>>On Wed, Apr 07, 2010 at 11:05:26AM +0200, Georg A. Duffner wrote:
> >>>>There seems to be a problem with footnotes when using luaotfload.
> >>>>The footnotemark in the text is rendered smaller but not
> >>>>superscript.
> >>>>
> >>>>Example:
> >>>>
> >>>>\documentclass{article}
> >>>>\usepackage{luaotfload}
> >>>>\begin{document}
> >>>>Text\footnote{footnote text}
> >>>>\end{document}
> >>>>
> >>>>The error:
> >>>>! Math error: parameter \Umathquad\displaystyle is not set.
> >>>>\@ensuredmath #1->$\relax #1$
> >>>>
> >>>>l.8 Text\footnote{
> >>>>                   footnote text}
> >>>>Sorry, but I can't typeset math unless various parameters have
> >>>>been set. This is normally done by loading special math fonts
> >>>>into the math family slots. Your font set is lacking at least
> >>>>the parameter mentioned earlier.
> >>>
> >>>Most likely this is because you've a TTF version of CM math fonts that
> >>>luaotfload is trying to load, and it is lacking such parameters. If you
> >>>are running debian, do you've either ttf-lyx or latex-xft-fonts packages
> >>>installed?
> >>>
> >>
> >>
> >>Well, you are partly right. This minimal example is using CM TTF
> >>fonts (and I have ttf-lyx installed, but not latex-xft-fonts). But
> >>the following examples are showing the same error (see attached
> >>logfile of #1):
> >>
> >>1. using “libertine” package with an adapted fd-file (see attachment)
> >>
> >>\documentclass{article}
> >>\usepackage[EU2]{fontenc}
> >>\usepackage{luaotfload}
> >>\usepackage{libertine}
> >>\begin{document}
> >>Text\footnote{footnote text}
> >>\end{document}
> >>
> >>2. using Linux Libertine OTF with fontspec
> >>
> >>\documentclass{article}
> >>\usepackage{fontspec}
> >>\setmainfont{Linux Libertine O}
> >>\begin{document}
> >>Text\footnote{footnote text}
> >>\end{document}
> >
> >Luaotfload doesn't change default latex fonts, what happens is that your
> >document requests one of CM math fonts, say cmmi10, which have the
> >necessary font parameters in the tfm file, but luaotfload finds the ttf
> >version you have and so loads it through the opentype font loader which
> >will not load any tfm files and thus the required font parameters will
> >not be set, resulting in the \Umathquad error you get.
> >
> >A quick solution is to uninstall the ttf-lyx package then update you
> >luaotfload font database, and every thing will be back to normal.
> 
> Thank you, that fixed it.
> 
> >Now, having several different fonts with the same font name is reciby
> >for troubles, and I don't consider this a luaoftload bug per se (you ask
> >for a font named "cmmi10" and you get one), but since this going to
> >affect many users (me included!), we need to find a better way to handle
> >this.
> 
> Yes, font management is definitely a problem on linux systems when
> you try to stay with the distribution’s packages. On Debian systems,
> if you install texlive from the repos and want to use the same fonts
> in other apps, you have to install several packages, which probably
> ship different versions. This gets even worse if you install vanilla
> texlive and update regularly. I have been trying to keep my system
> “clean” by not installing font-packages if texlive contains the
> fonts and instead putting a symlink to tex-fonts into my system’s
> fonts folder. Thus luaotfload and xetex do find two copies of some
> fonts, but they are in fact the same file. For me personally this
> works, but I think, something more generic would be good.

One solution to this specific issue is to make the old font definition
syntax load only TFM fonts, and make loading system fonts only through
the extended syntax, so:

\font\tenrm=ec-lmr10 at 10pt

or the extended:

\font\tenrm=file:ec-lmr10 at 10pt

Will not consult font names database, so old code that expects TFM fonts
will continue to work as expected, while:

\font\tenrm={name:Latin Modern Roman} at 10pt

Would be required to load system (or texmf) fonts by name. What do
others think about this?

Regards,
 Khaled

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer


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