48 lines
1.8 KiB
HTML
48 lines
1.8 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 due to subpixel shifts</title>
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<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
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<script src="chrome://mochikit/content/tests/SimpleTest/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)">
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<div id="t" style="width:400px; height:100px; background:yellow; overflow:hidden">
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<div style="height:40px;"></div>
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<div id="e" style="height:30px; background:lime"></div>
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<div style="height:60.4px; background:pink"></div>
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</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 t = document.getElementById("t");
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var e = document.getElementById("e");
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var utils = window.windowUtils;
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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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t.scrollTop = 5;
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// Scroll down as far as we can, to put our rendering layer at a subpixel offset within the layer
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waitForAllPaintsFlushed(function () {
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t.scrollTop = 1000;
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waitForAllPaintsFlushed(function () {
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// Clear paint state now and scroll again.
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utils.checkAndClearPaintedState(e);
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// scroll up a little bit. This should not cause anything to be repainted.
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t.scrollTop = t.scrollTop - 10;
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waitForAllPaintsFlushed(function () {
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var painted = utils.checkAndClearPaintedState(e);
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is(painted, false, "Fully-visible scrolled element should not have been painted");
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SimpleTest.finish();
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});
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});
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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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