Follow-up Comment #14, bug #57506 (project groff):
[comment #13 comment #13:]
> TrueType fonts allow little scripts within the font to be
> called before a glyph is stroked, so I suspect this is what
> is happening to correct the glyph position.
Thanks for the detective work! That explanation makes sense.
> Of course, when fontforge converts the font to type 1, any
> scriptlets in the font get dropped.
I suppose these scripts can be of arbitrary complexity, but I wonder if
there's a way for fontforge to detect ones that merely alter a glyph's
position, then account for that in the glyph definition it outputs.
> What a good reason for gropdf to support otf/ttf fonts natively!!
Surely just an afternoon's work... ;-}
> And now for something completely different...
>
> Assuming you have called your Libertine font family "Lib", try this:-
> echo "\fI\s'200'\v'200p'\N[2364]" | ./test-groff -Tpdf -fLib -ms > T.pdf
> Surprised he hasn't an italic lean!
I've learned that the numeric values that get placed in the font description
file (the thing that \N[] is looking up) can vary--depending on, I'm not sure
what, maybe different versions of fontforge or afmtodit, but I've run Peter's
install-font.sh on the same .ttf files at different times and ended up with
different numberings. So I'm not sure what glyph \N[2364] maps to on your
installation. For me:
# fgrep 2364 /usr/share/groff/site-font/devps/LI
u1E9F 461,699,13,119,-19,75 2 2364 uni1E9F
U+1E9F is LATIN SMALL LETTER DELTA, and when I run your command, I indeed get
an italic lowercase delta. But I bet \N[2364] is an entirely different glyph
in your Libertine Italic font.
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