test_transitions_replacement_with_setKeyframes.html

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<!doctype html>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1292001

-->

<head>

  <meta charset=utf-8>

  <title>Test for bug 1292001</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/paint_listener.js"></script>

  <script src="animation_utils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">

  <style>

    #target {

      height: 100px;

      width: 100px;

      background: green;

      transition: transform 100s linear;

  </style>

</head>

<body>

<div id="target"></div>

<script>

'use strict';

SimpleTest.waitForExplicitFinish();

const OMTAPrefKey = 'layers.offmainthreadcomposition.async-animations';

const omtaEnabled =

  SpecialPowers.DOMWindowUtils.layerManagerRemote &&

  SpecialPowers.getBoolPref(OMTAPrefKey);

window.addEventListener('load', async function() {

  if (!omtaEnabled) {

    ok(true, 'Skipping the test since OMTA is disabled');

    SimpleTest.finish();

    return;

  const div = document.getElementById('target');

  // Start first transition

  div.style.transform = 'translateX(300px)';

  const firstTransition = div.getAnimations()[0];

  // But then change its keyframes to something completely different.

  firstTransition.effect.setKeyframes({ 'opacity': ['0', '1'] });

  // Wait for the transition to start running on the main thread and

  // compositor.

  await firstTransition.ready;

  await waitForPaints();

  await new Promise(resolve => requestAnimationFrame(resolve));

  // Start second transition

  div.style.transform = 'translateX(600px)';

  const secondTransition = div.getAnimations()[0];

  const previousKeyframeValue = secondTransition.effect.getKeyframes()[0]

    .transform;

  // Tie up main thread for 300ms. In the meantime, the first transition

  // will continue running on the compositor. If we don't update the start

  // point of the second transition, it will appear to jump when it starts.

  const startTime = performance.now();

  while (performance.now() - startTime < 300);

  // Ensure that our paint process has been done.

//

  // (See explanation in test_transitions_replacement_on_busy_frame.html for

  // why we don't use requestAnimationFrame here.)

  await waitForPaints();

  // Now check that the keyframes are NOT updated.

is(

    secondTransition.effect.getKeyframes()[0].transform,

    previousKeyframeValue,

    'Keyframe value of transition is NOT updated since the moment when ' +

      'it was generated'

);

  SimpleTest.finish();

});

</script>

</body>

</html>