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<html>
<head>
<title>Test Frame Uniformity While Scrolling</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<style>
#content {
height: 5000px;
background: repeating-linear-gradient(#EEE, #EEE 100px, #DDD 100px, #DDD 200px);
}
</style>
<script type="text/javascript">
var scrollEvents = 100;
var i = 0;
// Scroll points
var x = 100;
var y = 150;
SimpleTest.waitForExplicitFinish();
var utils = SpecialPowers.getDOMWindowUtils(window);
function sendScrollEvent(aRafTimestamp) {
var scrollDiv = document.getElementById("content");
if (i < scrollEvents) {
i++;
// Scroll diff
var dx = 0;
var dy = -10; // Negative to scroll down
synthesizeNativeWheelAndWaitForWheelEvent(scrollDiv, x, y, dx, dy);
window.requestAnimationFrame(sendScrollEvent);
} else {
// Locally, with silk and apz + e10s, retina 15" mbp usually get ~1.0 - 1.5
// w/o silk + e10s + apz, I get up to 7. Lower is better.
// Windows, I get ~3. Values are not valid w/o hardware vsync
var uniformities = utils.getFrameUniformityTestData();
for (var j = 0; j < uniformities.layerUniformities.length; j++) {
var layerResult = uniformities.layerUniformities[j];
var layerAddr = layerResult.layerAddress;
var uniformity = layerResult.frameUniformity;
var msg = "Layer: " + layerAddr.toString(16) + " Uniformity: " + uniformity;
SimpleTest.ok((uniformity >= 0) && (uniformity < 4.0), msg);
}
SimpleTest.finish();
}
}
function startTest() {
window.requestAnimationFrame(sendScrollEvent);
}
if (!isApzEnabled()) {
SimpleTest.ok(true, "APZ not enabled, skipping test");
SimpleTest.finish();
}
waitUntilApzStable()
.then(() => pushPrefs([["gfx.vsync.collect-scroll-transforms", true]]))
.then(startTest);
</script>
</head>
<body>
<div id="content">
</div>
</body>
</html>
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