Bug 786502 - Test that scrolling a fixed background doesn't cause painting. r=roc

Add a test that makes sure that scrolling a page with a fixed background
doesn't cause that background to repaint.

--HG--
rename : layout/reftests/backgrounds/blue-32x32.png => layout/base/tests/chrome/blue-32x32.png
This commit is contained in:
Chris Lord 2012-09-13 11:35:16 +01:00
Родитель f455e70a11
Коммит 64ae8fd282
3 изменённых файлов: 38 добавлений и 0 удалений

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@ -43,6 +43,8 @@ MOCHITEST_CHROME_FILES = \
test_scrolling_repaints.html \
test_transformed_scrolling_repaints.html \
test_transformed_scrolling_repaints_2.html \
test_fixed_bg_scrolling_repaints.html \
blue-32x32.png \
$(NULL)
ifdef MOZ_DEBUG

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layout/base/tests/chrome/blue-32x32.png Normal file

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Ширина:  |  Высота:  |  Размер: 110 B

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@ -0,0 +1,36 @@
<!DOCTYPE HTML>
<html>
<head>
<title>Test that we don't get unnecessary repaints with fixed backgrounds</title>
<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="paint_listener.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
</head>
<!-- Need a timeout here to allow paint unsuppression before we start the test -->
<body onload="setTimeout(startTest,0)" style="background: url(blue-32x32.png) fixed">
<div style="height: 2048px"></div>
<pre id="test">
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
var utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor).
getInterface(Components.interfaces.nsIDOMWindowUtils);
function startTest() {
// Do a scroll to ensure we trigger activity heuristics.
waitForAllPaintsFlushed(function () {
// Clear paint state and scroll down
utils.checkAndClearPaintedState(document.body);
document.documentElement.scrollTop = 100;
waitForAllPaintsFlushed(function () {
// Make sure the body didn't paint
var painted = utils.checkAndClearPaintedState(document.body);
is(painted, false, "Fixed background should not have been painted when scrolled");
SimpleTest.finish();
});
});
}
</script>
</pre>
</body>
</html>