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fonts-build: test that duplicate cmap records don't use up the subtable cap

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Dylan M. Taylor committed 2026-11-02 20:31:13 -05:00
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commit 9d2d4f1cd9
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crates/fonts-build/src/tests.rs
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@@ -438,6 +438,11 @@ fn cmap_reads_a_shared_subtable_once() {
let subtables: Vec<&[(u32, u32)]> = one.iter().map(|g| &g[..]).collect();
let font = shared_cmap_font(&(0..20).collect::<Vec<_>>(), &subtables);
assert_eq!(Cmap::read(&font, 0).unwrap().ranges(), [(0x4E00, 0x4E0F)]);
// Duplicate records count once toward that cap: a distinct subtable after 16 records that
// share one is still read.
let font = shared_cmap_font(&[vec![0; 16], vec![1]].concat(), &[&[(0x4E00, 0x4E00)], &[(0x5000, 0x5000)]]);
assert_eq!(Cmap::read(&font, 0).unwrap().ranges(), [(0x4E00, 0x4E00), (0x5000, 0x5000)]);
}
/// A craft-fonts checkout in `scratch` with these `(family, scripts, role, font)` faces, all