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fix(time): use default DOM clock resolution

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This commit is contained in:
ldm0
2026-09-09 04:34:29 +08:00
committed by Donough Liu
parent ecbbf350ed
commit 8a353fa2aa
2 changed files with 12 additions and 6 deletions
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moli-renderer-v8/src/worker/global_scope/mod.rs
+3 -1
View File
@@ -6742,7 +6742,9 @@ fn worker_performance_now_callback<'s>(
rv.set(
v8::Number::new(
scope,
(monotonic_unix_epoch_millis() - time_origin).max(0.0),
moli_time::coarsened_dom_time_millis(
(monotonic_unix_epoch_millis() - time_origin).max(0.0),
),
)
.into(),
);
moli-time/src/lib.rs
+9 -5
View File
@@ -52,8 +52,11 @@ pub fn monotonic_timestamp_micros() -> u64 {
}
pub fn coarsened_dom_time_millis(millis: f64) -> f64 {
const FIVE_MICROSECONDS_PER_MILLISECOND: f64 = 200.0;
(millis * FIVE_MICROSECONDS_PER_MILLISECOND).floor() / FIVE_MICROSECONDS_PER_MILLISECOND
// High Resolution Time requires the default, non-isolated clock to expose
// no finer than 100 microseconds. Keep the shared clock on that safe
// default; cross-origin-isolated realms may opt into a finer clock later.
const TEN_TICKS_PER_MILLISECOND: f64 = 10.0;
(millis * TEN_TICKS_PER_MILLISECOND).floor() / TEN_TICKS_PER_MILLISECOND
}
pub fn dom_time_since_origin_millis(time_origin: f64) -> f64 {
@@ -241,9 +244,10 @@ mod tests {
}
#[test]
fn dom_time_coarsening_uses_five_microsecond_resolution() {
assert_eq!(coarsened_dom_time_millis(1.234_567), 1.23);
assert_eq!(coarsened_dom_time_millis(1.239_999), 1.235);
fn dom_time_coarsening_uses_default_hundred_microsecond_resolution() {
assert_eq!(coarsened_dom_time_millis(1.234_567), 1.2);
assert_eq!(coarsened_dom_time_millis(1.299_999), 1.2);
assert_eq!(coarsened_dom_time_millis(1.3), 1.3);
assert_eq!(
dom_time_since_origin_millis(unix_epoch_millis() + 1000.0),
0.0