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Integration: #330's Aki Below test measures the em box tops

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#330 wrote cjk_aki_below_sets_the_upper_lines_leading_below_it on a base where Aki
Below measured from the em box bottom. feat/cjk-typography measures it from the em box
top (as the corpus shows), so the test asserts that the lower line's em box top sits the
upper line's leading below the upper line's.
This commit is contained in:
aiongg
2026-10-10 16:45:36 +00:00
parent a4ac6b039c
commit fb727aa1b9
1 changed files with 5 additions and 3 deletions
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crates/compose/src/tests.rs
+5 -3
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@@ -3061,12 +3061,14 @@ fn cjk_aki_below_sets_the_upper_lines_leading_below_it() {
};
let lines = lines_with(japanese());
assert_eq!(lines.len(), 2);
let em_bottom = |l: &Line| {
// Aki Below measures from the em box tops: the lower line's sits the upper line's leading
// below the upper line's.
let em_top = |l: &Line| {
let g = &l.glyphs[0];
let (a, b) = g.face.vertical_metrics();
l.baseline + b / (a + b) * g.face.units_per_em() * g.sy
l.baseline - a / (a + b) * g.face.units_per_em() * g.sy
};
let gap = em_bottom(&lines[1]) - em_bottom(&lines[0]);
let gap = em_top(&lines[1]) - em_top(&lines[0]);
assert!((gap - 40.0).abs() < 1e-6, "{gap}");
// The other composers advance by the lower line's leading, baseline to baseline.
let lines = lines_with(ParaAttrs::default());