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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
commit0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch)
treea31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /layout/reftests/transform/partial-prerender-translate-10.html
parentInitial commit. (diff)
downloadfirefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz
firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
+<!--
+ A test case for a transform animation frame is positioned by specifying
+ left property (i.e. not transform property) so that if we didn't factor the
+ offset (from the reference frame) in the jank mechanism, the animation will
+ jank at wrong positions.
+ -->
+<style>
+html {
+ overflow: hidden;
+}
+body {
+ margin: 0px;
+ padding: 0px;
+}
+@keyframes anim {
+ 0% { transform: translateX(0px); animation-timing-function: step-end; }
+ /* After 1s, translate to a position where it's still inside the pre-render */
+ /* area. */
+ /* The right edge of the pre-render area is 1162.5px (see below for the */
+ /* calculation) and there is `left: -200px` property, which mean */
+ /* translateX(-162.5px) is the point where a jank happens. But we don't */
+ /* want to cause a jank at the edge since it results blurry boundary */
+ /* between green and blue areas because the jank will happen at a point */
+ /* very close to -162.5px, e.g. -162.4px. */
+ /* So what we try to do here is that, compositing where jank will never */
+ /* happen with the left property value, then trying to composite where a */
+ /* jank will happen if the left (-200px) value is not properly handled in */
+ /* the jank mechanism because the horizontal pre-render range is */
+ /* [37.5px, 1162.5px] (see below the calculation) */
+ 1% { transform: translateX(-150px); animation-timing-function: step-end; }
+ /* We have 100ms margin to avoid skipping this very keyframe */
+ 1.1% { transform: translateX(-150px); animation-timing-function: step-start; }
+ /* Back to the original position where jank should NEVER happen if the left */
+ /* property is handled in the jank mechanism, jank should happen if the */
+ /* property is NOT handled */
+ 100% { transform: translateX(0px); }
+}
+#target {
+ width: 1600px;
+ height: 1000px;
+ position: absolute;
+ left: -200px;
+ transform: translateX(0px);
+}
+</style>
+<div id="target">
+ <!--
+ Put an SVG element so that the transform display item has a blob on
+ WebRender which means this test properly fails without the proper fix.
+
+ The pre-render area width is 1125px, thus the expanded area outside of the
+ visible area is 325px. The 325px width is expaned to both directions,
+ leftward and rightward. Meanwhile, the horizontal visible frame range is
+ [200px, 1000px] because of `left: -200px`, so the left edge of the
+ pre-render area is 37.5px (= 200 - 325/2), the right edge is 1162.5px
+ (= 1000 + 325/2).
+ -->
+ <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1600 1000">
+ <rect fill="green" x="0" width="800" height="1000"></rect>
+ <rect fill="blue" x="800" width="362.5" height="1000"></rect>
+ <rect fill="red" x="1162.5" width="837.5" height="1000"></rect>
+ </svg>
+</div>
+<script>
+document.addEventListener("MozReftestInvalidate", () => {
+ // We don't specify 1s delay here since the @keyframes rule has already
+ // a kind of like delay with step-end timing function, which means even if
+ // the animation was painted at 0.1s position due to a lag on the main-thread
+ // (it quite often happens on our CIs!), the initial animation value on the
+ // compositor should be still the first value translateX(0px).
+ target.style.animation = "anim 100s";
+ target.addEventListener("animationstart", () => {
+ // Wait two seconds to make sure we tried to composite translateX(0px).
+ setTimeout(() => {
+ document.documentElement.classList.remove("reftest-wait");
+ }, 2000);
+ });
+}, { once: true });
+</script>
+</html>