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config: add inheritable option “font-shaping”

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This patch adds an inheritable option, “font-shaping”, that controls
whether a particle that renders text should enable font-shaping or
not.

The option works similar to the ‘font’ option: one can set it at the
top-level, and it gets inherited down through all modules and to their
particles.

Or, you can set it on a module and it gets inherited to all its
particles, but not to other modules’ particles.

Finally, you can set it on individual particles, in which case it only
applies to them (or “child” particles).

When font-shaping is enabled (the default), the string particle shapes
full text runs using the fcft_rasterize_text_run_utf32() API. In fcft,
this results in HarfBuzz being used to shape the string.

When disabled, the string particle instead uses the simpler
fcft_rasterize_char_utf32() API, which rasterizes individual
characters.

This gives user greater control over the font rendering. One example
is bitmap fonts, which HarfBuzz often doesn’t get right.

Closes #159
This commit is contained in:
Daniel Eklöf 2022-02-23 18:43:13 +01:00
parent 265188ca4c
commit ffccabbb13
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GPG key ID: 5BBD4992C116573F
17 changed files with 106 additions and 8 deletions
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6
doc/yambar-particles.5.scd
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@ -31,6 +31,12 @@ following attributes are supported by all particles:
: Font to use. Note that this is an inherited attribute; i.e. you can
set it on e.g. a _list_ particle, and it will apply to all
particles in the list.
| font-shaping
: enum
: no
: font-shaping; one of _full_ or _none_. When set to _full_ (the
default), strings will be "shaped" using HarfBuzz. Requires support
in fcft.
| foreground
: color
: no

6
doc/yambar.5.scd
View file

@ -130,6 +130,12 @@ types that are frequently used:
the primary font, and the rest fallback fonts. These are yambar
custom fallback fonts that will be searched before the fontconfig
provided fallback list.
| font-shaping
: enum
: no
: Default setting for font-shaping, for use in particles. One of
_full_ or _none_. When set to _full_ (the default), strings will be
"shaped" using HarfBuzz. Requires support in fcft.
| foreground
: color
: no