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Re: [Groff] using Linux Libertine with groff
From: |
Dave Kemper |
Subject: |
Re: [Groff] using Linux Libertine with groff |
Date: |
Sat, 09 Nov 2013 04:20:00 -0600 |
Thanks, Tadziu, for all the info and the demo file! A few followups
below.
> I think this is because afmtodit assumes these ligatures will be
> called "fi", "fl", "ff", "ffi", and "ffl", but in the new fonts
> they are called "f_i", "f_l", "f_f", "f_f_i", and "f_f_l".
I see. It looks like afmtodit looks for variants with spaces in the
names, but not underscores:
$ fgrep -A6 'default_ligatures =' `type -p afmtodit`
my %default_ligatures = (
"fi", "f i",
"fl", "f l",
"ff", "f f",
"ffi", "ff i",
"ffl", "ff l",
);
> (I believe other ligatures can't currently be used with groff.
> As far as I know, this is hardwired.)
Yes, according to "info groff gtroff fonts ligatures", those five are
the only ones supported. A quick grep through the code shows that
src/include/font.h defines five enum values in class font, for LIG_ff,
LIG_fi, etc. And as the above code snippet shows, those are the only
ones afmtodit looks for.
It should be fairly straightforward to add new hard-coded ligatures to
the groff source, and to afmtodit. (A better design, though harder to
implement, would be to not hard-code ligatures at all, but have groff
query the font for available ligatures. But it's not clear there's a
reliable way to find them: a comment in afmtodit says many AFM files
lack the correct demarcation for ligatures.)
> You have to call afmtodit with the "-i" option when generating
> the description file for the italic fonts (the manual page
> says that "-i50" was used for the standard fonts).
Thanks for the tip. Peter and I have been discussing how best to get
install-font.sh to support this.
> I've attached a demo PDF showing the results.
Great! What version of Libertine did you use to
generate this file? I have 5.3.0, the most recent one on
http://sourceforge.net/projects/linuxlibertine/, but some of my ligatures
look different from (and not nearly as good as) the ones in your demo.