test_animations_reverse.html

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<html>

<head>

  <meta charset=utf-8>

  <title>Test for Animation.reverse() on compositor animations</title>

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

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

  <script type="application/javascript" src="animation_utils.js"></script>

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

  <style type="text/css">

    @keyframes anim {

      0% { transform: translate(0px) }

      100% { transform: translate(100px) }

    .target {

      /* The animation target needs geometry in order to qualify for OMTA */

      width: 100px;

      height: 100px;

      background-color: white;

  </style>

</head>

<body>

<div id="display"></div>

<script type="application/javascript">

"use strict";

SimpleTest.waitForExplicitFinish();

runOMTATest(function() {

  runAllAsyncAnimTests().then(SimpleTest.finish);

}, SimpleTest.finish, SpecialPowers);

addAsyncAnimTest(async function() {

  var [ div, cs ] = new_div("animation: anim 10s linear");

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

  // Animation is initially running on compositor

  await waitForPaintsFlushed();

  advance_clock(5000);

  omta_is(div, 'transform', { tx: 50 }, RunningOn.Compositor,

          'Animation is initally animating on compositor');

  // Reverse animation

  animation.reverse();

  // At this point the playbackRate has changed but the transform will

  // not have changed.

  await waitForPaints();

  omta_is(div, 'transform', { tx: 50 }, RunningOn.Compositor,

          'Animation value does not change after being reversed');

  // However, we should still have sent a layer transaction to update the

  // playbackRate on the compositor so that on the next tick we advance

  // in the right direction.

  advance_clock(1000);

  omta_is(div, 'transform', { tx: 40 }, RunningOn.Compositor,

          'Animation proceeds in reverse direction');

  done_div();

});

</script>

</body>

</html>