Hi, I played around with different fonts, especially Bitstream XCharter and Overpass (http://overpassfont.org/) and wanted to combine them. However, I see some issues regarding ligatures, kerning and obliques/italics.
Here is a minimal example:
```
\definefontfeature[default][mode=node, kern=yes, liga=yes]
% more features
% [mode=node, kern=yes, liga=yes, tlig=yes, itlg=yes, ccmp=yes, language=dflt,
protrusion=quality, expansion=quality]
\definefontfamily [myfont][roman][xcharter]
\definefontfamily [myfont][sansserif][overpass][rscale=0.93]
\definefontfamily [myfont][teletype][overpass][rscale=0.93]
\definefontfamily [myfont][mono][overpassmono][rscale=0.93]
\definetypeface [myfont][mathematics][math] [xcharter]
\setupbodyfont[myfont, 11pt]
\startTEXpage
\showfontkerns
Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi
abcdel™}, \slanted{effi abcdel™}\\
\style[sans]{Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi
abcdel™}, \slanted{effi abcdel™}}\\
\style[mono]{Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi
abcdel™}, \slanted{effi abcdel™}}\\
\showbodyfont[myfont]
\stopTEXpage
```
It produces the PDF in the attachment. I'm struggling with several things:
- xcharter seems to have no kerning applied. It is listed as font feature,
though. Is it correct to have no kerning at all for that font?
- xcharter also have no ligatures (at least it doesn't look like that). That is
listed as font feature, too, although only for italic and slanted. According to
https://tug.org/FontCatalogue/xcharter/ there are ligatures in the font.
- Overpass has a glyph for the ae ligature. Is it normal that it is not used as
a ligature for ae?
- Overpass Mono does not contain italic glyphs. I would have expected obliques
when using \slanted then. However, it just remains normal.
- I included the ™ in the example since its italic glyph is not slanted. For
all fonts \slanted seems to switch to the extra (italic?) glyphs, while I would
have expected obliques. At least overpass seems to have no dedicated slanted
style, while xcharter has one.
- Is there a command to show ligatures the same way there is a command for
kerning?
I attached the output of the following commands, too:
mtxrun --script font --list --file --info --pattern='xcharter*'
mtxrun --script font --list --file --info --pattern='overpass*'
Thanks
Gerion
font-features.txt.zst
Description: application/zstd
mwe.pdf
Description: Adobe PDF document
signature.asc
Description: This is a digitally signed message part.
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