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c3bb93064b
Automatic update from web-platform-tests Force KeyframeModel::time_offset_ to be 0 for scroll-driven animations. KeyframeModel::CalculateActiveTime shifts all times by time_offset_, which is initialized when we start the animation on the compositor. But we don't want such shifting for scroll-driven animations, because cc::Animation::Tick gives the KeyframeModel a pause_time_ based on absolute progress (the current scroll position). Fix by making Animation::ComputeCompositorTimeOffset return 0 during Animation::StartAnimationOnCompositor, even if the scroll position is non-zero from an earlier scroll. Bug: 1431191 Change-Id: Ie2a2b7e099c12232e05900907231da1729ee6c34 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4498525 Commit-Queue: Steve Kobes <skobes@chromium.org> Reviewed-by: Kevin Ellis <kevers@chromium.org> Cr-Commit-Position: refs/heads/main@{#1138967} -- wpt-commits: 797d2099e320aa895aae4c445ab3cefc9379b23c wpt-pr: 39810
73 lines
1.6 KiB
HTML
73 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait">
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<title>Composited scroll-linked animation with initial scroll offset</title>
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<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/">
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<link rel="match" href="scroll-animation-initial-offset-ref.html">
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<style>
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#scroller {
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overflow-y: auto;
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height: 200px;
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border: 2px solid green;
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position: relative;
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background: gray;
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}
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.spacer {
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height: 1000px;
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}
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@keyframes anim {
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0% { transform: translateY(0); }
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100% { transform: translateY(800px); }
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}
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#align {
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box-sizing: border-box;
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width: 100%;
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height: 50px;
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background: rgba(0, 0, 200, 0.2);
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color: white;
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position: absolute;
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border: 1px solid white;
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animation: anim linear 10s;
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animation-timeline: scroll();
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will-change: transform;
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}
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#marker {
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width: 100%;
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height: 50px;
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background: #640;
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position: absolute;
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top: 350px;
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}
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</style>
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<div id="scroller">
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<div id="align">TOP</div>
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<div class="spacer"></div>
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<div id="marker">BOTTOM</div>
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</div>
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<script>
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// Test that a scroll-linked animation of a composited property reacts
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// correctly to a programmatic scroll early during the page load.
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//
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// The scroll offset will change before the animation is "started" on the
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// compositor, so it needs to be able to handle a non-zero initial offset.
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//
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scroller.scrollTo(0, 200);
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</script>
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<script src="/web-animations/testcommon.js"></script>
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<script>
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document.documentElement.addEventListener('TestRendered', async () => {
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await waitForCompositorReady();
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await waitForNextFrame();
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await waitForNextFrame();
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document.documentElement.classList.remove("reftest-wait");
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}, { once: true });
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</script>
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