103470 2012-11-27 17:01:27 -0800 Test compositing and slow scrolling behavior of fixed position elements under transformed elements 2013-10-01 03:28:59 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 102543 1 wangxianzhu wangxianzhu 7raivis jamesr klobag shawnsingh simon.fraser skyostil tomhudson vangelis webkit.review.bot oldest_to_newest 777389 0 wangxianzhu 2012-11-27 17:01:27 -0800 Any visible fixed position element that is not composited can cause slow scrolling on Chromium (ScrollingCoordinator::mainThreadScrollingReasons -> ScrollingCoordinator::hasVisibleSlowRepaintFixedObjects()). Fixed position element under transformed element is not composited because of the following code in RenderLayerCompositor: // Don't promote fixed position elements that are descendants of transformed elements. // They will stay fixed wrt the transformed element rather than the enclosing frame. if (container != m_renderView) return false; 777438 1 jamesr 2012-11-27 18:15:44 -0800 http://dev.w3.org/csswg/css3-transforms/#transform-rendering says: For elements whose layout is governed by the CSS box model, any value other than ‘none’ for the transform results in the creation of both a stacking context and a containing block. The object acts as a containing block for fixed positioned descendants. NOTE: Is this effect on position:fixed necessary? If so, need to go into more detail here about why fixed positioned objects should do this, i.e., that it's much harder to implement otherwise. See Bug 16328. Related bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=16328 777934 2 skyostil 2012-11-28 08:30:01 -0800 At least for Chromium that restriction in RenderLayerCompositor seems unnecessary because we already mark transformed layers as being containers for child fixed position layers and the compositor knows how to deal with that. 779569 3 176844 wangxianzhu 2012-11-29 16:12:05 -0800 Created attachment 176844 Patch (can't build on EWS, depends on the patch of bug 102543) 779573 4 176846 wangxianzhu 2012-11-29 16:18:46 -0800 Created attachment 176846 Patch (can't build on EWS, depends on the patch of bug 102543) The last patch was a wrong version. Updated. 784838 5 176846 skyostil 2012-12-06 04:09:32 -0800 Comment on attachment 176846 Patch (can't build on EWS, depends on the patch of bug 102543) View in context: https://bugs.webkit.org/attachment.cgi?id=176846&action=review > Source/WebCore/page/scrolling/ScrollingCoordinator.cpp:345 > + && viewportConstrainedObject->container() == viewportConstrainedObject->view()) Would it be better to avoid adding these types of fixed positioned elements to viewportConstrainedObjects() in the first place since they aren't really viewport constrained? This would make this function return the correct result in non-accelerated compositing builds too. 784982 6 wangxianzhu 2012-12-06 09:36:13 -0800 (In reply to comment #5) > (From update of attachment 176846 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=176846&action=review > > > Source/WebCore/page/scrolling/ScrollingCoordinator.cpp:345 > > + && viewportConstrainedObject->container() == viewportConstrainedObject->view()) > > Would it be better to avoid adding these types of fixed positioned elements to viewportConstrainedObjects() in the first place since they aren't really viewport constrained? This would make this function return the correct result in non-accelerated compositing builds too. I have thought of this but for now the elements are added/removed in RenderLayerModelObject::styleDidChange() which seems not to cover all the cases that an element becomes viewport constrained or not viewport constrained. For example, a viewport-constrained fixed position element may become non-viewport-constrained without style change of itself. Seems we can add/remove the viewport-constrained objects in RenderLayerCompositor::requiresCompositingForPosition()? 789181 7 178962 wangxianzhu 2012-12-11 21:47:03 -0800 Created attachment 178962 Patch 799239 8 simon.fraser 2013-01-02 21:28:23 -0800 Has this ever been observed on a web page in the wild? 800419 9 wangxianzhu 2013-01-04 11:20:44 -0800 (In reply to comment #8) > Has this ever been observed on a web page in the wild? Not really. Noticed this when we were looking for all possibilities causing slow scrolling on Chromium. 800421 10 178962 simon.fraser 2013-01-04 11:22:47 -0800 Comment on attachment 178962 Patch This this is just a new test, you should retitle the bug accordingly. 800454 11 181349 wangxianzhu 2013-01-04 11:44:16 -0800 Created attachment 181349 Patch 800555 12 181349 webkit.review.bot 2013-01-04 13:06:11 -0800 Comment on attachment 181349 Patch Clearing flags on attachment: 181349 Committed r138842: <http://trac.webkit.org/changeset/138842> 800556 13 webkit.review.bot 2013-01-04 13:06:16 -0800 All reviewed patches have been landed. Closing bug. 176844 2012-11-29 16:12:05 -0800 2012-11-29 16:18:46 -0800 Patch (can't build on EWS, depends on the patch of bug 102543) patch-103470 text/plain 3419 wangxianzhu Y29tbWl0IGZkYzY0MmQ1NzBmODk1NjQ1MTAyZGY2YzkyYzQ2ODdiYmM1Zjk4OWYKQXV0aG9yOiBY aWFuemh1IFdhbmcgPHdhbmd4aWFuemh1QGNocm9taXVtLm9yZz4KRGF0ZTogICBUaHUgTm92IDI5 IDIzOjUzOjIxIDIwMTIgKzAwMDAKCiAgICB4CgpkaWZmIC0tZ2l0IGEvTGF5b3V0VGVzdHMvY29t cG9zaXRpbmcvbGF5ZXItY3JlYXRpb24vbm8tY29tcG9zaXRpbmctZm9yLWZpeGVkLXBvc2l0aW9u LXVuZGVyLXRyYW5zZm9ybS1leHBlY3RlZC50eHQgYi9MYXlvdXRUZXN0cy9jb21wb3NpdGluZy9s YXllci1jcmVhdGlvbi9uby1jb21wb3NpdGluZy1mb3ItZml4ZWQtcG9zaXRpb24tdW5kZXItdHJh bnNmb3JtLWV4cGVjdGVkLnR4dApuZXcgZmlsZSBtb2RlIDEwMDY0NAppbmRleCAwMDAwMDAwLi43 MjhhNDY5Ci0tLSAvZGV2L251bGwKKysrIGIvTGF5b3V0VGVzdHMvY29tcG9zaXRpbmcvbGF5ZXIt Y3JlYXRpb24vbm8tY29tcG9zaXRpbmctZm9yLWZpeGVkLXBvc2l0aW9uLXVuZGVyLXRyYW5zZm9y bS1leHBlY3RlZC50eHQKQEAgLTAsMCArMSwxNyBAQAorVEVTVAorKEdyYXBoaWNzTGF5ZXIKKyAg 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