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comparison: layout/base/tests/chrome/test_scrolling_repaints.html
layout/base/tests/chrome/test_scrolling_repaints.html
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| -1:000000000000 | 0:da9861d32ea3 |
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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test that we don't get unnecessary repaints due to subpixel shifts</title> | |
| 5 <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script> | |
| 6 <script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/paint_listener.js"></script> | |
| 7 <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/> | |
| 8 </head> | |
| 9 <!-- Need a timeout here to allow paint unsuppression before we start the test --> | |
| 10 <body onload="setTimeout(startTest,0)"> | |
| 11 <div id="t" style="width:400px; height:100px; background:yellow; overflow:hidden"> | |
| 12 <div style="height:40px;"></div> | |
| 13 <div id="e" style="height:30px; background:lime"></div> | |
| 14 <div style="height:60.4px; background:pink"></div> | |
| 15 </div> | |
| 16 <pre id="test"> | |
| 17 <script type="application/javascript"> | |
| 18 SimpleTest.waitForExplicitFinish(); | |
| 19 | |
| 20 var t = document.getElementById("t"); | |
| 21 var e = document.getElementById("e"); | |
| 22 var utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor). | |
| 23 getInterface(Components.interfaces.nsIDOMWindowUtils); | |
| 24 | |
| 25 function startTest() { | |
| 26 // Do a scroll to ensure we trigger activity heuristics. | |
| 27 waitForAllPaintsFlushed(function () { | |
| 28 t.scrollTop = 5; | |
| 29 // Scroll down as far as we can, to put our rendering layer at a subpixel offset within the layer | |
| 30 waitForAllPaintsFlushed(function () { | |
| 31 t.scrollTop = 1000; | |
| 32 waitForAllPaintsFlushed(function () { | |
| 33 // Clear paint state now and scroll again. | |
| 34 utils.checkAndClearPaintedState(e); | |
| 35 // scroll up a little bit. This should not cause anything to be repainted. | |
| 36 t.scrollTop = t.scrollTop - 10; | |
| 37 waitForAllPaintsFlushed(function () { | |
| 38 var painted = utils.checkAndClearPaintedState(e); | |
| 39 is(painted, false, "Fully-visible scrolled element should not have been painted"); | |
| 40 SimpleTest.finish(); | |
| 41 }); | |
| 42 }); | |
| 43 }); | |
| 44 }); | |
| 45 } | |
| 46 </script> | |
| 47 </pre> | |
| 48 </body> | |
| 49 </html> |
