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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 |
| 3 <!-- crbug.com/336676 - layer creation should not accidentally skip requesting |
| 4 the compositor for a frame to be produced. When there were no other |
| 5 repaints or layout/style changes, the simple act of adding a layer was not |
| 6 triggering compositing updates by itself. To recreate this scenario, an |
| 7 out-of-flow canvas element is added to an empty composited layer. The |
| 8 actual container layer does not get added to the tree until it realizes |
| 9 that it receives the canvas content. --> |
| 10 |
| 11 |
| 12 <html> |
| 13 <head> |
| 14 <style> |
| 15 |
| 16 .composited { |
| 17 -webkit-transform: translatez(0); |
| 18 } |
| 19 |
| 20 .box { |
| 21 position: absolute; |
| 22 z-index: 1; |
| 23 width: 300px; |
| 24 height: 300px; |
| 25 top: 0px; |
| 26 left: 0px; |
| 27 } |
| 28 |
| 29 canvas { |
| 30 position: absolute; |
| 31 z-index: 1; |
| 32 top: 0px; |
| 33 left: 0px; |
| 34 } |
| 35 |
| 36 </style> |
| 37 |
| 38 <script> |
| 39 |
| 40 if (window.testRunner) |
| 41 testRunner.dumpAsText(); |
| 42 |
| 43 |
| 44 var canvasElement; |
| 45 |
| 46 function addCanvasToTree() { |
| 47 document.getElementById("container").appendChild(canvasElement); |
| 48 } |
| 49 |
| 50 function runTest() { |
| 51 canvasElement = document.createElement("canvas"); |
| 52 canvasElement.width = 200; |
| 53 canvasElement.height = 200; |
| 54 var context = canvasElement.getContext("2d"); |
| 55 context.fillStyle = "green"; |
| 56 context.fillRect(80, 80, 50, 50); |
| 57 |
| 58 if (!window.testRunner) { |
| 59 // If the test is being run interactively, then |
| 60 // the canvas should correctly appear after 1 second. |
| 61 setTimeout(addCanvasToTree, 1000); |
| 62 return; |
| 63 } |
| 64 |
| 65 testRunner.display(); |
| 66 |
| 67 // This should initiate a compositor frame via scheduleAnimation(). |
| 68 addCanvasToTree(); |
| 69 |
| 70 if (window.internals.isCompositorFramePending(document)) |
| 71 document.getElementById("result").innerHTML = "PASS - did schedule animati
on"; |
| 72 else |
| 73 document.getElementById("result").innerHTML = "FAIL - did not schedule ani
mation"; |
| 74 } |
| 75 |
| 76 </script> |
| 77 </head> |
| 78 |
| 79 <body onload="runTest()"> |
| 80 <div id="container" class="composited box"></div> |
| 81 <div id="result">The green box should appear after 1 second when running this
test interactively.</div> |
| 82 </body> |
| 83 |
| 84 </html> |
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Chromium Code Reviews
Issue 139103009:
If a compositing update is declared as needed, scheduleAnimation should be triggered. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk