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<!DOCTYPE HTML>
<html>
<!--
Bug 1171489 - Tests if the framerate actor does not record timestamps from multiple frames.
-->
<head>
<meta charset="utf-8">
<title>Framerate actor test</title>
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript" src="inspector-helpers.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
</head>
<body>
<pre id="test">
<script>
"use strict";
window.onload = async function() {
// inspector-helpers doesnt wait for explicit finish
SimpleTest.waitForExplicitFinish();
const TICK = 1000;
const url = document.getElementById("testContent").href;
const { target, doc } = await attachURL(url);
const contentWin = doc.defaultView;
const front = await target.getFront("framerate");
await front.startRecording();
await waitFor(TICK);
const onWindowReady = waitForWindowReady();
contentWin.location.reload();
// Wait for the iframe to be loaded again
await onWindowReady;
await waitFor(TICK);
const ticks = await front.stopRecording();
await onRecordingStopped(ticks);
await target.destroy();
SimpleTest.finish();
};
// Local Helpers
function waitFor(time) {
return new Promise(resolve => setTimeout(resolve, time));
}
function waitForWindowReady() {
return new Promise(resolve => {
window.addEventListener("message", function loaded(event) {
if (event.data === "ready") {
window.removeEventListener("message", loaded);
resolve();
}
});
});
}
function onRecordingStopped(ticks) {
const diffs = [];
info(`Got ${ticks.length} ticks.`);
for (let i = 1; i < ticks.length; i++) {
const prev = ticks[i - 1];
const curr = ticks[i];
diffs.push(curr - prev);
info(curr + " - " + (curr - prev));
}
// 1000 / 60 => 16.666... so we shouldn't get more than diffs of 16.66.. but
// when we get ticks from other frames they're usually at diffs of < 1. Sometimes
// ticks can still be less than 16ms even on one frame (usually following a very slow
// frame), so use a low number (2) to be our threshold
const THRESHOLD = 2;
ok(ticks.length >= 20,
"we should have atleast 20 ticks over the course of two seconds.");
const belowThreshold = diffs.filter(v => v <= THRESHOLD);
ok(belowThreshold.length <= 10,
"we should have very few frames less than the threshold");
}
</script>
</pre>
<a id="testContent" target="_blank" href="inspector-traversal-data.html">Test Document</a>
</body>
</html>
|
