65 lines
2.3 KiB
HTML
65 lines
2.3 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Long Animation Frame Timing: basic</title>
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<meta name="timeout" content="long">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="resources/utils.js"></script>
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<body>
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<h1>Long Animation Frame: blocking duration</h1>
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<div id="log"></div>
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<script>
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function loaf_blocking_duration_test(run, label) {
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const OVERHEAD_EPSILON = 5;
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const BLOCKING_THRESHOLD = 50;
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promise_test(async t => {
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let found = false;
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for (let i = 0; i < 10 && !found; ++i) {
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const longtask_promise = new Promise(resolve => new PerformanceObserver(
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(entries, observer) => {
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resolve(entries.getEntries());
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observer.disconnect();
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}).observe({entryTypes: ["longtask"]}));
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const [longtask_entries, loaf_entry] = await Promise.all(
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[longtask_promise, expect_long_frame(run, t)]);
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const overlapping = longtask_entries.filter(longtask =>
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(longtask.startTime >= loaf_entry.startTime &&
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longtask.startTime < (loaf_entry.startTime + loaf_entry.duration) &&
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(!loaf_entry.renderStart ||
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(longtask.startTime < loaf_entry.renderStart - OVERHEAD_EPSILON))));
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const longest_index = overlapping.reduce(
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(max, cur, i) => cur > overlapping[max] ? i : max, 0);
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let expected_blocking_duration = 0;
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overlapping.forEach(({duration}, i) => {
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if (i === longest_index && loaf_entry.renderStart)
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duration += loaf_entry.startTime + loaf_entry.duration -
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loaf_entry.renderStart;
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expected_blocking_duration += Math.max(0, duration - BLOCKING_THRESHOLD);
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});
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if (!overlapping.length && loaf_entry.renderStart) {
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expected_blocking_duration =
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Math.max(0,
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loaf_entry.startTime + loaf_entry.duration - loaf_entry.renderStart -
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BLOCKING_THRESHOLD);
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}
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if (Math.abs(loaf_entry.blockingDuration - expected_blocking_duration) <
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OVERHEAD_EPSILON) {
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found = true;
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}
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}
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assert_true(found);
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}, `LoAF blockingDuration should be equivalent to long tasks: ${label}`);
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}
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loaf_blocking_duration_test(t => t.step_timeout(busy_wait), "Non-rendering");
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loaf_blocking_duration_test(t => t.step_timeout(() => {
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busy_wait();
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requestAnimationFrame(busy_wait);
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}), "Rendering");
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</script>
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</body>
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