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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);
+
+ async function sendScrollEvent(aRafTimestamp) {
+ var scrollDiv = document.getElementById("content");
+
+ if (i < scrollEvents) {
+ i++;
+ // Scroll diff
+ var dx = 0;
+ var dy = -10; // Negative to scroll down
+ await synthesizeNativeWheel(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();
+ }
+ </script>
+</head>
+
+<body>
+ <div id="content">
+ </div>
+</body>
+</html>