gecko-dev/layout/base/tests/test_flush_on_paint.html

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HTML

<!DOCTYPE HTML>
<html>
<head>
<title>Test that we flush before painting</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body onload="doIteration()">
<p id="display"></p>
<div id="content" style="display: none">
</div>
<embed type="application/x-test" id="plugin" drawmode="solid" style="width:200px; height:200px;"></embed>
<pre id="test">
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
SimpleTest.requestFlakyTimeout("This test deals with painting and invalidation. " +
"Those are tricky to detect, so we have to poll here, which means that we have to rely on flaky timeouts. " +
"This special case is safe because we're only polling for events.");
var iterations = 0;
var plugin = document.getElementById("plugin");
var lastPaintCount;
var expectedWidth;
var toggle = true;
function invalidationLoop() {
toggle = !toggle;
var color = toggle ? "8F" : "00";
plugin.setColor("FFFFFF" + color);
setTimeout(invalidationLoop, 20);
}
invalidationLoop();
function doIteration() {
lastPaintCount = window.mozPaintCount;
ok(true, "Beginning iteration " + iterations + ", last paint count: " + lastPaintCount);
expectedWidth = 201 + iterations;
plugin.style.width = expectedWidth + "px";
checkDone();
}
function checkDone() {
ok(true, "Check to see if we're done: " + window.mozPaintCount);
if (window.mozPaintCount == lastPaintCount) {
setTimeout(checkDone, 30);
return;
}
var utils = SpecialPowers.getDOMWindowUtils(window);
is(plugin.getWidthAtLastPaint(), utils.screenPixelsPerCSSPixel*expectedWidth,
"Check that we set width before painting");
++iterations;
if (iterations < 100) {
doIteration();
} else {
SimpleTest.finish();
}
}
</script>
</pre>
</body>
</html>