diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /layout/generic/test/test_flex_interrupt.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/generic/test/test_flex_interrupt.html')
| -rw-r--r-- | layout/generic/test/test_flex_interrupt.html | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/layout/generic/test/test_flex_interrupt.html b/layout/generic/test/test_flex_interrupt.html new file mode 100644 index 0000000000..dfe4208f93 --- /dev/null +++ b/layout/generic/test/test_flex_interrupt.html @@ -0,0 +1,107 @@ +<!doctype html> +<title>Test for bug 1579929</title> +<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"> +<script src="/tests/SimpleTest/SimpleTest.js"></script> +<script src="/tests/SimpleTest/EventUtils.js"></script> +<style> + .container { + display: flex; + flex-direction: column; + overflow-y: scroll; + } + #outer { + width: 500px; + height: 300px; + } +</style> +<div class="container" id="outer"> + <div class="item" id="firstItem" style="width: 50px"> + <!--popuplated by script--> + </div> + <div class="container"> + <div class="container"> + <div class="container"> + <div class="container"> + <div class="container"> + <div class="item">Item</div> + </div> + </div> + </div> + </div> + </div> +</div> +<script> +SimpleTest.waitForExplicitFinish(); + +// Globals/constants: + +const gUtils = SpecialPowers.DOMWindowUtils; + +// This needs to match/exceed nsPresContext::sInterruptChecksToSkip in order +// for us to actually be able to trigger the mHasPendingInterrupt=true codepath +// in this test. Each of these "dummy" blocks will trigger a call to +// nsPresContext::CheckForInterrupt, and after 200, we'll actually trigger an +// interrupt. +const gInterruptCheckThreshold = 200; + +// Expected to match the inline style="width:..." for #firstItem (we slowly +// increment it to trigger reflows): +let gFirstItemWidthPX = 50; + +function main() { + const outer = document.getElementById("outer"); + const firstItem = document.getElementById("firstItem"); + + // Insert a bunch of elements to be sure we actually get interrupted. + // (See description of gInterruptCheckThreshold above) + for (let i = 0; i < gInterruptCheckThreshold; i++) { + let dummyBlock = document.createElement("div"); + dummyBlock.innerText = "dummy"; + firstItem.appendChild(dummyBlock); + } + + // Flush any pending relayout: + outer.offsetHeight; + + // Take control of the refresh driver + gUtils.advanceTimeAndRefresh(0); + + // Force reflow and store the "cost" (in num-frames-reflowed) + const costOfNormalReflow = forceReflow(); + + // Sanity-check: do that again and remeasure cost, to be sure it's stable: + const costOfNormalReflow2 = forceReflow(); + is(costOfNormalReflow, costOfNormalReflow2, + "Our forceReflow function is expected to reliably trigger " + + "the same set of frames to be reflowed. If this fails, there's a " + + "bug in the test, or non-determinism in layout code."); + + // Now, we force the next reflow to get interrupted, and then measure the + // cost under those conditions: + gUtils.forceReflowInterrupt(); + const costOfInterruptedReflow = forceReflow(); + + // Hopefully the interrupted one was less expensive... + ok(costOfInterruptedReflow <= costOfNormalReflow, + "num frames reflowed in interrupted reflow (" + + costOfInterruptedReflow + + ") shouldn't exceed the num frames reflowed in normal reflow (" + + costOfNormalReflow + ")"); + + gUtils.restoreNormalRefresh(); + SimpleTest.finish(); +} + +// This function dirties firstItem's width, forces a reflow, and +// returns the number of frames that were reflowed as a result. +function forceReflow() { + gFirstItemWidthPX++; + firstItem.style.width = gFirstItemWidthPX + "px"; + + const origFramesReflowed = gUtils.framesReflowed; + gUtils.advanceTimeAndRefresh(0); + return gUtils.framesReflowed - origFramesReflowed; +} + +main(); +</script> |