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Glyphs: a consonant's ligature in a cluster with its vowel sign is its glyph

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Ka with a nukta and the vowel sign I is shaped as one cluster: the vowel
sign's glyph, then the ligature of Ka and the nukta. The ligature is
neither Ka's default glyph nor an alternate, so the lookup found no
glyph for Ka: text.glyphAlternates reported the vowel sign's glyph and
text.setGlyphAlternate reported Ka's default glyph. When the cluster
holds neither, the lookup now takes the first glyph that is not drawn
for another character of the grapheme.
This commit is contained in:
dotCooCoo
2026-11-05 05:20:03 +07:00
committed by bflatastic
parent 961b28d420
commit 92ecb4a6b0
2 changed files with 39 additions and 3 deletions
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crates/engine/src/tests/textedit.rs
+22
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@@ -2589,6 +2589,28 @@ fn the_glyph_of_a_consonant_after_its_vowel_sign_is_reported() {
assert_eq!(s.execute("text.glyphAlternates", &json!({"id": id.0, "start": 0})).unwrap()["chosen"], json!(g('a')));
}
/// Ka with a nukta and the vowel sign I is one cluster: the vowel sign drawn first, then the
/// ligature of Ka and the nukta, which is neither Ka's default glyph nor one of its alternates. The
/// glyph reported for Ka is the ligature, not the vowel sign.
#[test]
fn the_ligature_of_a_consonant_after_its_vowel_sign_is_reported() {
use vectorcraft_text::test_fonts::{MATRA_FAMILY, matra_font, source_sans_gid};
let _fonts = crate::adding_fonts();
let db = vectorcraft_text::FontDb::global();
db.add_font(matra_font().expect("the test font builds"));
let g = |c| u32::from(source_sans_gid(c).expect("a Source Sans glyph"));
let mut s = session();
let text = "क\u{93C}\u{93F}";
let r = s.execute("text.create", &json!({"x": 100, "y": 100, "text": text, "size": 20, "font": MATRA_FAMILY})).unwrap();
let id = NodeId(r["id"].as_u64().unwrap());
let gids: Vec<_> = vectorcraft_text::layout(db, &obj(&s, id)).glyphs.iter().map(|gl| (gl.gid, gl.byte, gl.len)).collect();
assert_eq!(gids, [(g('i'), 0, 9), (g('N'), 0, 9)], "the vowel sign is drawn first, then the ligature");
assert_eq!(s.execute("text.glyphAlternates", &json!({"id": id.0, "start": 0})).unwrap()["chosen"], json!(g('N')));
let r = s.execute("text.setGlyphAlternate", &json!({"id": id.0, "start": 0, "gid": null})).unwrap();
assert_eq!(r["gid"], json!(g('N')), "the ligature is drawn for Ka");
}
/// A character that overflows its area is shaped with its grapheme: the nukta after Ka makes the
/// font's `nukt` ligature, which `salt` does not change, so `gid: null` reports the ligature as it
/// does for the laid-out text.