Bug 1307555 - Mochitest. r=kats

MozReview-Commit-ID: 1e06rX4SQD8 --HG-- extra : rebase_source : 4f2aa932af8c1c8332d49aeaace687c71a4d58bc
2018-02-26 16:39:35 -05:00 · 2018-02-26 16:39:35 -05:00 · 6f01e47daa
--- a/gfx/layers/apz/test/mochitest/helper_hittest_checkerboard.html
+++ b/gfx/layers/apz/test/mochitest/helper_hittest_checkerboard.html
@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>APZ hit-testing over a checkerboarded area</title>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+  <meta name="viewport" content="width=device-width"/>
+</head>
+<body>
+ <div id="scroller" style="width: 300px; height: 300px; overflow:scroll; margin-top: 100px; margin-left: 50px">
+  <!-- Make the contents tall enough to be sure we can checkerboard -->
+  <div id="contents" style="width: 100%; height: 5000px; background-image: linear-gradient(blue,red)">
+  </div>
+ </div>
+ <div id="make_root_scrollable" style="height: 5000px"></div>
+</body>
+<script type="application/javascript">
+
+function centerOf(element) {
+  var bounds = element.getBoundingClientRect();
+  return { x: bounds.x + (bounds.width / 2), y: bounds.y + (bounds.height / 2) };
+}
+
+function* test(testDriver) {
+  var config = getHitTestConfig();
+  var utils = config.utils;
+
+  var scroller = document.getElementById('scroller');
+
+  // Activate the scrollframe but keep the main-thread scroll position at 0.
+  // Also apply an async scroll offset in the y-direction such that the
+  // scrollframe scrolls all the way to the bottom of its range, where it's
+  // sure to checkerboard.
+  utils.setDisplayPortForElement(0, 0, 300, 1000, scroller, 1);
+  yield waitForAllPaints(testDriver);
+  var scrollY = scroller.scrollTopMax;
+  utils.setAsyncScrollOffset(scroller, 0, scrollY);
+  if (config.isWebRender) {
+    // Tick the refresh driver once to make sure the compositor has applied the
+    // async scroll offset (for APZ hit-testing this doesn't matter, but for
+    // WebRender hit-testing we need to make sure WR has the latest info).
+    utils.advanceTimeAndRefresh(16);
+    utils.restoreNormalRefresh();
+  }
+
+  var scrollerViewId = utils.getViewId(scroller);
+
+  // Hit-test the middle of the scrollframe, which is now inside the
+  // checkerboarded region, and check that we hit the scrollframe and
+  // not its parent.
+  var {hitInfo, scrollId} = hitTest(centerOf(scroller));
+  is(hitInfo, APZHitResultFlags.VISIBLE,
+     "active scrollframe hit info");
+  is(scrollId, scrollerViewId,
+     "active scrollframe scrollid");
+
+  subtestDone();
+}
+
+waitUntilApzStable().then(runContinuation(test));
+
+</script>
+</html>
--- a/gfx/layers/apz/test/mochitest/mochitest.ini
+++ b/gfx/layers/apz/test/mochitest/mochitest.ini
@ -20,6 +20,7 @@
    helper_iframe1.html
    helper_iframe2.html
    helper_hittest_basic.html
+    helper_hittest_checkerboard.html
    helper_hittest_subframe_float.html
    helper_key_scroll.html
    helper_long_tap.html
--- a/gfx/layers/apz/test/mochitest/test_group_hittest.html
+++ b/gfx/layers/apz/test/mochitest/test_group_hittest.html
@ -29,6 +29,7 @@ var prefs = [
 var subtests = [
  {'file': 'helper_hittest_basic.html', 'prefs': prefs},
  {'file': 'helper_hittest_subframe_float.html', 'prefs': prefs},
+  {'file': 'helper_hittest_checkerboard.html', 'prefs': prefs},
 ];

 if (isApzEnabled()) {