| <!DOCTYPE html> |
| |
| <html> |
| <head> |
| <script src="../../resources/ui-helper.js"></script> |
| <style> |
| .layer { |
| width: 100px; |
| height: 100px; |
| position: absolute; |
| transform: translate3d(0, 0, 0); |
| } |
| #first { |
| background-color: red; |
| } |
| #second { |
| left: 200px; |
| background-color: red; |
| } |
| #repaint { |
| width: 50px; |
| height: 50px; |
| background-color: red; |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| if (testRunner.dontForceRepaint) |
| testRunner.dontForceRepaint(); |
| } |
| async function doTest() |
| { |
| await UIHelper.renderingUpdate(); |
| |
| // Make the front buffer of 'first' contain green, and the back red. |
| document.getElementById('first').style.backgroundColor = "green"; |
| await UIHelper.renderingUpdate(); |
| |
| // Make 'first' volatile and trigger a paint by mutating an unrelated layer. |
| window.internals.markFrontBufferVolatile(document.getElementById('first')); |
| document.getElementById('second').style.backgroundColor = "green"; |
| |
| await UIHelper.renderingUpdate(); |
| |
| // Do a partial repaint on 'first', such that we re-use the existing |
| // red buffer and make it all green (by copying from the old front, plus |
| // repainting the new subset). |
| document.getElementById('repaint').style.backgroundColor = "green"; |
| |
| await UIHelper.renderingUpdate(); |
| await UIHelper.renderingUpdate(); |
| |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| } |
| window.addEventListener('load', doTest, false); |
| </script> |
| </head> |
| <body> |
| <div class="layer" id="first">A<div id="repaint"></div></div> |
| <div class="layer" id="second">B</div> |
| </body> |
| </html> |
