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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 • committed by Mikhail
parent f35e60577f
commit 4858b3db7b
4 changed files with 603 additions and 19 deletions
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config.h
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@ -438,6 +438,7 @@ struct config {
enum fcft_scaling_filter fcft_filter;
bool overflowing_glyphs;
bool grapheme_shaping;
bool ligatures;
enum {
GRAPHEME_WIDTH_WCSWIDTH,
GRAPHEME_WIDTH_DOUBLE,