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| -rw-r--r-- | layout/reftests/transform/partial-prerender-translate-10.html | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/layout/reftests/transform/partial-prerender-translate-10.html b/layout/reftests/transform/partial-prerender-translate-10.html new file mode 100644 index 0000000000..3bf5c57dc7 --- /dev/null +++ b/layout/reftests/transform/partial-prerender-translate-10.html @@ -0,0 +1,83 @@ +<!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> |