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config: add underline-offset option

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This option allows the user to configure a custom underline
offset. That is, use the user provided offset instead of the font
provided one.

Closes #490
This commit is contained in:
Daniel Eklöf 2021-06-17 17:52:38 +02:00
parent 11829931a7
commit cf81fff062
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6 changed files with 42 additions and 9 deletions
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22
doc/foot.ini.5.scd
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@ -112,10 +112,24 @@ in this order:
Default: _0_.
*box-drawings-uses-font-glyphs*
Boolean. When disabled, foot generates box/line drawing characters
itself. The are several advantages to doing this instead of using
font glyphs:
*underline-offset*
Use a custom offset for underlines. The offset is, by default, in
_points_ and relative the font's baseline. A positive value
positions the underline under the baseline, while a negative value
positions it above the baseline.
To specify an offset in _pixels_, append *px*:
*underline-offset=2px*.
If left unset (the default), the offset specified in the font is
used, or estimated by foot if the font lacks underline positioning
information.
Default: _unset_.
*box-drawings-uses-font-glyphs* Boolean. When disabled, foot generates
box/line drawing characters itself. The are several advantages to
doing this instead of using font glyphs:
- No antialiasing effects where e.g. line endpoints appear
dimmed down, or blurred.