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172e6e789a
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
37 lines
1.4 KiB
HTML
37 lines
1.4 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test that we don't get unnecessary repaints with fixed backgrounds</title>
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<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="paint_listener.js"></script>
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<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
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</head>
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<!-- Need a timeout here to allow paint unsuppression before we start the test -->
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<body onload="setTimeout(startTest,0)" style="background: url(blue-32x32.png) fixed">
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<div style="height: 2048px"></div>
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<pre id="test">
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<script type="application/javascript">
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SimpleTest.waitForExplicitFinish();
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var utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor).
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getInterface(Components.interfaces.nsIDOMWindowUtils);
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function startTest() {
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// Do a scroll to ensure we trigger activity heuristics.
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waitForAllPaintsFlushed(function () {
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// Clear paint state and scroll down
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utils.checkAndClearPaintedState(document.body);
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document.documentElement.scrollTop = 100;
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waitForAllPaintsFlushed(function () {
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// Make sure the body didn't paint
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var painted = utils.checkAndClearPaintedState(document.body);
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is(painted, false, "Fixed background should not have been painted when scrolled");
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SimpleTest.finish();
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});
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});
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}
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</script>
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</pre>
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</body>
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</html>
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