blob: e649d91c16311e289f179c5adf2970c4ac8bc22f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
<!doctype html>
<html>
<head>
<link rel="help" href="https://html.spec.whatwg.org/multipage/webappapis.html#update-the-rendering">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
/* Coarsen to 5 microseconds or coarser */
const COARSE_RESOLUTION = 0.005;
const CUSTOM_TIMELINE_DELTA = 0.002;
const FLOATING_POINT_ERROR_EPSILON = 0.00001;
// Note that this test would fail if the platform introduces a jitter.
// It is recommended that platforms that implement jitter run this test
// with a flag that turns jitter off, if possible.
const customTimeline = new DocumentTimeline({originTime: CUSTOM_TIMELINE_DELTA});
promise_test(async t => {
for (let i = 0; i < 32; ++i) {
const timestamp = await new Promise(resolve => requestAnimationFrame(ts => resolve(ts)));
const coarse_timestamp = Math.round(timestamp / COARSE_RESOLUTION) * COARSE_RESOLUTION;
assert_approx_equals(timestamp, coarse_timestamp, FLOATING_POINT_ERROR_EPSILON,
"timestamp should be coarsened");
assert_approx_equals(timestamp, document.timeline.currentTime, FLOATING_POINT_ERROR_EPSILON,
"document.timeline.currentTimeline should be the same as the rAF callback");
assert_approx_equals(customTimeline.currentTime + CUSTOM_TIMELINE_DELTA,
timestamp, FLOATING_POINT_ERROR_EPSILON,
"originTime for custom timeline should not be coarsened");
}
});
</script>
</body>
</html>
|
