зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1617427 - Add a test for the scenario being fixed. r=botond
Differential Revision: https://phabricator.services.mozilla.com/D66428 --HG-- extra : moz-landing-system : lando
This commit is contained in:
Kartikaya Gupta
Родитель
c4913fea1d
Коммит
67bc5d7367
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@ -198,6 +198,30 @@ function isLayerized(elementId) {
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return false;
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return false;
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}
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}
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// Return a rect (or null) that holds the last known content-side displayport
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// for a given element. (The element selection works the same way, and with
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// the same assumptions as the isLayerized function above).
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function getLastContentDisplayportFor(elementId) {
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var contentTestData = SpecialPowers.getDOMWindowUtils(
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window
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).getContentAPZTestData();
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var nonEmptyBucket = getLastNonemptyBucket(contentTestData.paints);
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ok(nonEmptyBucket != null, "expected at least one nonempty paint");
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var seqno = nonEmptyBucket.sequenceNumber;
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contentTestData = convertTestData(contentTestData);
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var paint = contentTestData.paints[seqno];
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for (var scrollId in paint) {
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if ("contentDescription" in paint[scrollId]) {
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if (paint[scrollId].contentDescription.includes(elementId)) {
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if ("displayport" in paint[scrollId]) {
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return parseRect(paint[scrollId].displayport);
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}
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}
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}
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}
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return null;
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}
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// Return a promise that is resolved on the next rAF callback
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// Return a promise that is resolved on the next rAF callback
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function waitForFrame() {
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function waitForFrame() {
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return new Promise(resolve => {
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return new Promise(resolve => {
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@ -0,0 +1,104 @@
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<!DOCTYPE HTML>
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<html id="root-element">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width; initial-scale=1.0">
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<title>Checkerboarding while root scrollframe async-scrolls and a
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subframe has APZ force disabled</title>
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<script type="application/javascript" src="apz_test_utils.js"></script>
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<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
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<script src="/tests/SimpleTest/paint_listener.js"></script>
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<script type="application/javascript">
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function* test(testDriver) {
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var utils = SpecialPowers.getDOMWindowUtils(window);
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var subframe = document.getElementById('subframe');
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// layerize subframe
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yield synthesizeNativeClick(subframe, 10, 10, testDriver);
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// verify layerization
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yield waitForAllPaints(() => setTimeout(testDriver, 0));
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ok(isLayerized("subframe"), "subframe should be layerized at this point");
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var subframeScrollId = utils.getViewId(subframe);
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ok(subframeScrollId > 0, "subframe should have a scroll id");
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// then disable APZ for it
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utils.disableApzForElement(subframe);
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// wait for the dust to settle
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yield waitForAllPaints(() => setTimeout(testDriver, 0));
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// Check that the root element's displayport has at least 500px of vertical
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// displayport margin on either side. This will ensure that we can scroll
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// by 500px without causing the displayport to move, which in turn means that
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// the scroll will not trigger repaints (due to paint-skipping).
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var rootElem = document.documentElement;
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var rootDisplayport = getLastContentDisplayportFor(rootElem.id);
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ok(rootDisplayport != null, "root element should have a displayport");
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dump("root dp: " + JSON.stringify(rootDisplayport) +
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", height: " + rootElem.clientHeight);
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var rootDpVerticalMargin = (rootDisplayport.h - rootElem.clientHeight) / 2;
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ok(rootDpVerticalMargin > 500,
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"root element should have at least 500px of vertical displayport margin");
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// Scroll enough that we reveal new parts of the subframe, but not so much
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// that the root displayport starts moving. If the root displayport moves,
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// the main-thread will trigger a repaint of the subframe, but if the root
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// displayport doesn't move, we get a paint-skipped scroll which is where the
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// bug manifests. (The bug being that the subframe ends in a visual perma-
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// checkerboarding state). Note that we do an 'auto' behavior scroll so
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// that it's "instant" rather than an animation. Animations would demonstrate
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// the bug too but are more complicated to wait for.
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window.scrollBy({top: 500, left: 0, behavior: 'auto'});
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is(window.scrollY, 500, "document got scrolled instantly");
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// Note that at this point we must NOT call flushApzRepaints, because
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// otherwise APZCCallbackHelper::NotifyFlushComplete will trigger a repaint
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// (for unrelated reasons), and the repaint will clear the checkerboard
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// state. We do, however, want to wait for a "steady state" here that
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// includes all pending paints from the main thread and a composite that
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// samples the APZ state. (The latter is not required if the APZ frame delay
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// is disabled, but it's enabled by default so it's desirable to handle that
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// situation as well.) In order to accomplish this we wait for all the main
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// thread paints, and then force a composite via advanceTimeAndRefresh. The
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// advanceTimeAndRefresh has the additional advantage of freezing the refresh
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// driver which avoids any additional externally-triggered repaints from
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// erasing the symptoms of the bug.
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yield waitForAllPaints(() => setTimeout(testDriver, 0));
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utils.advanceTimeAndRefresh(0);
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var data = utils.getCompositorAPZTestData();
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//dump(JSON.stringify(data, null, 4));
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var found = false;
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for (apzcData of data.additionalData) {
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if (apzcData.key == subframeScrollId) {
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var checkerboarding = apzcData.value.split(',').includes("checkerboarding");
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ok(!checkerboarding, "subframe is not checkerboarding");
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found = true;
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}
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}
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ok(found, "Found the checkerboarding subframe");
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utils.restoreNormalRefresh();
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subtestDone();
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}
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waitUntilApzStable().then(runContinuation(test));
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</script>
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<style>
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#subframe {
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overflow-x: auto;
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margin-left: 100px; /* makes APZ minimap easier to see */
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}
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</style>
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</head>
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<body>
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<div id="subframe">
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<div style="width: 10000px; height: 10000px; background-image: linear-gradient(green, red)">
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</div>
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</div>
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</body>
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</html>
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@ -68,3 +68,4 @@
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[test_group_zoomToFocusedInput.html]
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[test_group_zoomToFocusedInput.html]
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[test_group_scroll_snap.html]
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[test_group_scroll_snap.html]
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skip-if = (os == 'android') # wheel events not supported on mobile
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skip-if = (os == 'android') # wheel events not supported on mobile
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[test_group_checkerboarding.html]
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@ -0,0 +1,34 @@
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="application/javascript" src="apz_test_utils.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<script type="application/javascript">
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if (isApzEnabled()) {
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SimpleTest.waitForExplicitFinish();
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var prefs = [
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["apz.test.logging_enabled", true],
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["apz.paint_skipping.enabled", true],
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["apz.displayport_expiry_ms", 0],
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["general.smoothScroll", false],
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["apz.minimap.enabled", true], // helps to debug these tests
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];
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const subtests = [
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{ file: "helper_checkerboard_apzforcedisabled.html", prefs },
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];
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// Run the actual test in its own window, because it requires that the
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// root APZC be scrollable. Mochitest pages themselves often run
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// inside an iframe which means we have no control over the root APZC.
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window.onload = () => {
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runSubtestsSeriallyInFreshWindows(subtests)
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.then(SimpleTest.finish, SimpleTest.finish);
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};
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}
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</script>
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</head>
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<body>
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</body>
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</html>
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