Dactyloidae/gfx/layers/apz/test/mochitest/test_layerization.html

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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1173580
-->
<head>
<title>Test for layerization</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
<script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<link rel="stylesheet" type="text/css" href="helper_subframe_style.css"/>
<style>
#container {
display: flex;
overflow: scroll;
height: 500px;
}
.outer-frame {
height: 500px;
overflow: scroll;
flex-basis: 100%;
background: repeating-linear-gradient(#CCC, #CCC 100px, #BBB 100px, #BBB 200px);
}
#container-content {
height: 200%;
}
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1173580">APZ layerization tests</a>
<p id="display"></p>
<div id="container">
<div id="outer1" class="outer-frame">
<div id="inner1" class="inner-frame">
<div class="inner-content"></div>
</div>
</div>
<div id="outer2" class="outer-frame">
<div id="inner2" class="inner-frame">
<div class="inner-content"></div>
</div>
</div>
<iframe id="outer3" class="outer-frame" src="helper_iframe1.html"></iframe>
<iframe id="outer4" class="outer-frame" src="helper_iframe2.html"></iframe>
<!-- The container-content div ensures 'container' is scrollable, so the
optimization that layerizes the primary async-scrollable frame on page
load layerizes it rather than its child subframes. -->
<div id="container-content"></div>
</div>
<pre id="test">
<script type="application/javascript;version=1.7">
// Scroll the mouse wheel over |element|.
function scrollWheelOver(element, waitForScroll, testDriver) {
moveMouseAndScrollWheelOver(element, 10, 10, testDriver, waitForScroll);
}
const DISPLAYPORT_EXPIRY = 100;
// This helper function produces another helper function, which, when invoked,
// invokes the provided testDriver argument in a setTimeout 0. This is really
// just useful in cases when there are no paints pending, because then
// waitForAllPaints will invoke its callback synchronously. If we did
// waitForAllPaints(testDriver) that might cause reentrancy into the testDriver
// which is bad. This function works around that.
function asyncWrapper(testDriver) {
return function() {
setTimeout(testDriver, 0);
};
}
function* test(testDriver) {
// Initially, nothing should be layerized.
ok(!isLayerized('outer1'), "initially 'outer1' should not be layerized");
ok(!isLayerized('inner1'), "initially 'inner1' should not be layerized");
ok(!isLayerized('outer2'), "initially 'outer2' should not be layerized");
ok(!isLayerized('inner2'), "initially 'inner2' should not be layerized");
ok(!isLayerized('outer3'), "initially 'outer3' should not be layerized");
ok(!isLayerized('inner3'), "initially 'inner3' should not be layerized");
ok(!isLayerized('outer4'), "initially 'outer4' should not be layerized");
ok(!isLayerized('inner4'), "initially 'inner4' should not be layerized");
// Scrolling over outer1 should layerize outer1, but not inner1.
yield scrollWheelOver(document.getElementById('outer1'), true, testDriver);
ok(isLayerized('outer1'), "scrolling 'outer1' should cause it to be layerized");
ok(!isLayerized('inner1'), "scrolling 'outer1' should not cause 'inner1' to be layerized");
// Scrolling over inner2 should layerize both outer2 and inner2.
yield scrollWheelOver(document.getElementById('inner2'), true, testDriver);
ok(isLayerized('inner2'), "scrolling 'inner2' should cause it to be layerized");
ok(isLayerized('outer2'), "scrolling 'inner2' should also cause 'outer2' to be layerized");
// The second half of the test repeats the same checks as the first half,
// but with an iframe as the outer scrollable frame.
// Scrolling over outer3 should layerize outer3, but not inner3.
yield scrollWheelOver(document.getElementById('outer3').contentDocument.documentElement, true, testDriver);
ok(isLayerized('outer3'), "scrolling 'outer3' should cause it to be layerized");
ok(!isLayerized('inner3'), "scrolling 'outer3' should not cause 'inner3' to be layerized");
// Scrolling over outer4 should layerize both outer4 and inner4.
yield scrollWheelOver(document.getElementById('outer4').contentDocument.getElementById('inner4'), true, testDriver);
ok(isLayerized('inner4'), "scrolling 'inner4' should cause it to be layerized");
ok(isLayerized('outer4'), "scrolling 'inner4' should also cause 'outer4' to be layerized");
// Now we enable displayport expiry, and verify that things are still
// layerized as they were before.
yield SpecialPowers.pushPrefEnv({"set": [["apz.displayport_expiry_ms", DISPLAYPORT_EXPIRY]]}, testDriver);
ok(isLayerized('outer1'), "outer1 is still layerized after enabling expiry");
ok(!isLayerized('inner1'), "inner1 is still not layerized after enabling expiry");
ok(isLayerized('outer2'), "outer2 is still layerized after enabling expiry");
ok(isLayerized('inner2'), "inner2 is still layerized after enabling expiry");
ok(isLayerized('outer3'), "outer3 is still layerized after enabling expiry");
ok(!isLayerized('inner3'), "inner3 is still not layerized after enabling expiry");
ok(isLayerized('outer4'), "outer4 is still layerized after enabling expiry");
ok(isLayerized('inner4'), "inner4 is still layerized after enabling expiry");
// Now we trigger a scroll on some of the things still layerized, so that
// the displayport expiry gets triggered.
// Expire displayport with scrolling on outer1
yield scrollWheelOver(document.getElementById('outer1'), true, testDriver);
yield waitForAllPaints(function() {
flushApzRepaints(testDriver);
});
yield setTimeout(testDriver, DISPLAYPORT_EXPIRY);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(!isLayerized('outer1'), "outer1 is no longer layerized after displayport expiry");
ok(!isLayerized('inner1'), "inner1 is still not layerized after displayport expiry");
// Expire displayport with scrolling on inner2
yield scrollWheelOver(document.getElementById('inner2'), true, testDriver);
yield waitForAllPaints(function() {
flushApzRepaints(testDriver);
});
// Once the expiry elapses, it will trigger expiry on outer2, so we check
// both, one at a time.
yield setTimeout(testDriver, DISPLAYPORT_EXPIRY);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(!isLayerized('inner2'), "inner2 is no longer layerized after displayport expiry");
yield setTimeout(testDriver, DISPLAYPORT_EXPIRY);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(!isLayerized('outer2'), "outer2 got de-layerized with inner2");
// Scroll on inner3. inner3 isn't layerized, and this will cause it to
// get layerized, but it will also trigger displayport expiration for inner3
// which will eventually trigger displayport expiration on inner3 and outer3.
// Note that the displayport expiration might actually happen before the wheel
// input is processed in the compositor (see bug 1246480 comment 3), and so
// we make sure not to wait for a scroll event here, since it may never fire.
// However, if we do get a scroll event while waiting for the expiry, we need
// to restart the expiry timer because the displayport expiry got reset. There's
// no good way that I can think of to deterministically avoid doing this.
let inner3 = document.getElementById('outer3').contentDocument.getElementById('inner3');
yield scrollWheelOver(inner3, false, testDriver);
yield waitForAllPaints(function() {
flushApzRepaints(testDriver);
});
var timerId = setTimeout(testDriver, DISPLAYPORT_EXPIRY);
var timeoutResetter = function() {
ok(true, "Got a scroll event; resetting timer...");
clearTimeout(timerId);
setTimeout(testDriver, DISPLAYPORT_EXPIRY);
// by not updating timerId we ensure that this listener resets the timeout
// at most once.
};
inner3.addEventListener('scroll', timeoutResetter, false);
yield; // wait for the setTimeout to elapse
inner3.removeEventListener('scroll', timeoutResetter, false);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(!isLayerized('inner3'), "inner3 becomes unlayerized after expiry");
yield setTimeout(testDriver, DISPLAYPORT_EXPIRY);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(!isLayerized('outer3'), "outer3 is no longer layerized after inner3 triggered expiry");
// Scroll outer4 and wait for the expiry. It should NOT get expired because
// inner4 is still layerized
yield scrollWheelOver(document.getElementById('outer4').contentDocument.documentElement, true, testDriver);
yield waitForAllPaints(function() {
flushApzRepaints(testDriver);
});
// Wait for the expiry to elapse
yield setTimeout(testDriver, DISPLAYPORT_EXPIRY);
yield waitForAllPaints(asyncWrapper(testDriver));
ok(isLayerized('inner4'), "inner4 is still layerized because it never expired");
ok(isLayerized('outer4'), "outer4 is still layerized because inner4 is still layerized");
}
if (isApzEnabled()) {
SimpleTest.waitForExplicitFinish();
SimpleTest.requestFlakyTimeout("we are testing code that measures an actual timeout");
SimpleTest.expectAssertions(0, 8); // we get a bunch of "ASSERTION: Bounds computation mismatch" sometimes (bug 1232856)
// Disable smooth scrolling, because it results in long-running scroll
// animations that can result in a 'scroll' event triggered by an earlier
// wheel event as corresponding to a later wheel event.
// Also enable APZ test logging, since we use that data to determine whether
// a scroll frame was layerized.
pushPrefs([["general.smoothScroll", false],
["apz.displayport_expiry_ms", 0],
["apz.test.logging_enabled", true]])
.then(waitUntilApzStable)
.then(runContinuation(test))
.then(SimpleTest.finish);
}
</script>
</pre>
</body>
</html>