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Add font ligature rendering support

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Add tweak.ligatures option (default: no) for OpenType liga/calt
rendering with programming fonts. Ligatures are render-only —
the grid and copy/paste are unchanged.

Uses fcft_rasterize_shaped_run() to shape full runs with
HarfBuzz and render each glyph by its shaped glyph ID,
correctly handling contextual alternates and ligatures.

Block cursor over a ligature uses a pixman gradient as composite
source for single-pass correct-color rendering.
This commit is contained in:
barsmonster 2026-02-13 11:30:56 +00:00
parent c291194a4e
commit ade745f303
4 changed files with 599 additions and 19 deletions
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15
doc/foot.ini.5.scd
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@ -1964,6 +1964,21 @@ any of these options.
Default: _yes_
*ligatures*
Boolean. When enabled, foot renders font ligatures —
multi-character sequences like ->, =>, !=, <= that
programming fonts (Fira Code, JetBrains Mono, Cascadia Code,
etc.) display as combined glyphs.
Ligatures are purely visual — copy/paste always preserves
the original individual characters.
Requires a font with ligature tables and fcft compiled with
HarfBuzz support. Has no visible effect with fonts that do
not define ligatures.
Default: _no_
*grapheme-width-method*
Selects which method to use when calculating the width
(i.e. number of columns) of a grapheme cluster. One of