37 lines
1.9 KiB
Rust
37 lines
1.9 KiB
Rust
//! Font fallback for characters of scripts with usual families gives the same face whatever earlier
|
|
//! lookups read. Its own test binary, so no installed font has been read when it starts.
|
|
|
|
use effectcraft_text::{fonts, variable};
|
|
|
|
#[test]
|
|
fn script_fallback_does_not_depend_on_earlier_lookups() {
|
|
fonts::scan_system();
|
|
let inter = fonts::resolve("Inter", "Regular").face;
|
|
let scripts = ['א', 'م', 'क', 'த', 'ก', 'あ', '水', '한'];
|
|
let before: Vec<_> = scripts.iter().map(|&c| fonts::fallback_for(c, inter)).collect();
|
|
// A character that no usual family covers keeps its face after a character of the same block
|
|
// that no face covers. On macOS only faces outside the Arabic list (.SF Arabic and .SF Arabic
|
|
// Rounded) cover U+08A4, and no face covers U+0870.
|
|
let first = fonts::fallback_for('\u{8a4}', inter);
|
|
fonts::fallback_for('\u{870}', inter);
|
|
let again = fonts::fallback_for('\u{8a4}', inter);
|
|
assert_eq!(again, first, "U+08A4: {} → {}", fonts::face(first).info.family, fonts::face(again).info.family);
|
|
// U+0590 is unassigned, in the Hebrew range. Armenian and Lao have no usual family; they share
|
|
// 256-character blocks with Hebrew and Thai. The variable font search reads installed faces in
|
|
// scan order. On macOS the first face in the scan, Arial Unicode MS, covers Armenian, Lao and
|
|
// the eight characters in `scripts`.
|
|
for c in ['\u{590}', 'Ա', 'ກ'] {
|
|
fonts::fallback_for(c, inter);
|
|
}
|
|
variable::find_variable_face();
|
|
let changed: Vec<String> = scripts
|
|
.iter()
|
|
.zip(&before)
|
|
.filter_map(|(&c, &id)| {
|
|
let after = fonts::fallback_for(c, inter);
|
|
(after != id).then(|| format!("{c}: {} → {}", fonts::face(id).info.family, fonts::face(after).info.family))
|
|
})
|
|
.collect();
|
|
assert!(changed.is_empty(), "{changed:?}");
|
|
}
|