178396 2017-10-17 10:27:14 -0700 Composited frames incorrectly get requestAnimationFrame throttled 2017-12-05 15:30:53 -0800 1 1 1 Unclassified WebKit Animations WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mihaip simon.fraser cdumez commit-queue dino simon.fraser webkit-bug-importer zalan oldest_to_newest 1361293 0 mihaip 2017-10-17 10:27:14 -0700 I'm observing iframes having their requestAnimationFrame callbacks getting incorrectly throttled because WebKit thinks that they are outside of the viewport, when they are in fact visible. To reproduce (in either Safari 11.0 or more recent WebKit builds - I tried r223536): 1. Go to http://persistent.info/webkit/test-cases/frame-raf-throttling/container.html. There is an "overflow: auto" scrollable div (gray background, 300 pixels wide) in which there is a composited iframe (yellow, 2000 pixels wide). The iframe uses requestAnimationFrame (for how it just reports the interval between successive calls, to make throttling more apparent) 2. Scroll the container sideways 3. Once the scroll offset goes past the window width (there's a "Scroll to Window Width" button to do this) then the requestAnimationFrame cadence drops down every 10 seconds, corresponding to the aggressiveThrottlingAnimationInterval value in ScriptedAnimationController (which is triggered by ThrottlingReason::OutsideViewport) What I've traced is that when the area gets scrolled, we end up in FrameView::viewportContentsChanged, which uses applyRecursivelyWithVisibleRect() to get the visible rect to determine if the iframe is visible. That in turn relies on windowClipRect(), and that returns a 0x0 sized rectangle. Digging into windowClipRect, we end up in windowClipRectForFrameOwner, which since the frame has an enclosing layer uses that layer's childrenClipRect. The return value of that is (-<scroll offset>, y - <window width> x <window height>). Thus if the scroll offset is greater than the window width, when we intersect the rectangle with the window's clip rectangle. The reason why childrenClipRect's return value appears to refleect the window's dimensions is because it passes renderer().view().unscaledDocumentRect() as the paintDirtyRect parameter to calculateRects (which forms the basis of the return value). I'm out of my depth here as far as my WebKit knowledge, so someone with more familiarity will need to attempt a fix. Though the manifestation of this bug is that requestAnimationFrame gets throttled incorrectly, since the problem is at a lower level (as far as determining its visible rectangle) there may be other side effects too. Given that unscaledDocumentRect is used as the initial value, a workaround is to add an element to the main frame document that is as wide as the iframe. This is what the "Add Filler" button does, and once that element is present (even if the main frame document uses "overflow: hidden") then throttling does not occur. 1361317 1 webkit-bug-importer 2017-10-17 11:12:10 -0700 <rdar://problem/35033205> 1378076 2 simon.fraser 2017-12-04 21:05:27 -0800 I think the issue is that FrameView::windowClipRectForFrameOwner() uses enclosingLayer->childrenClipRect() which is sensitive to compositing. 1378081 3 simon.fraser 2017-12-04 21:25:01 -0800 RenderLayer::childrenClipRect() takes the document rect (renderer().view().unscaledDocumentRect()) and calls localToAbsoluteQuad() on it, which maps it through the scroll offset, so it can end up with some large negative offset. This seems wrong; we should probably map LayoutRect::infiniteRect() through and then clip to the document rect. 1378082 4 simon.fraser 2017-12-04 21:26:28 -0800 I also note that RenderWidget::setWidgetGeometry() uses childrenClipRect() and may have a similar bug. 1378357 5 328497 simon.fraser 2017-12-05 14:15:18 -0800 Created attachment 328497 Patch 1378400 6 328497 commit-queue 2017-12-05 15:30:51 -0800 Comment on attachment 328497 Patch Clearing flags on attachment: 328497 Committed r225554: <https://trac.webkit.org/changeset/225554> 1378401 7 commit-queue 2017-12-05 15:30:53 -0800 All reviewed patches have been landed. Closing bug. 328497 2017-12-05 14:15:18 -0800 2017-12-05 15:30:51 -0800 Patch bug-178396-20171205141518.patch text/plain 6890 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogMjI1NTEyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNDlkYjc4MmZlZDViMGYw OWNhZDNlYTk3MTg4Y2ZkNGQ3OTIxMWExZi4uYzhjZDlkYjM1Nzc0NzRiNTUyYmU1MzkyZmQ2OGQ2 MWRmM2JhYTU5NSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI3IEBACisyMDE3LTEyLTA1ICBTaW1v biBGcmFzZXIgIDxzaW1vbi5mcmFzZXJAYXBwbGUuY29tPgorCisgICAgICAgIENvbXBvc2l0ZWQg ZnJhbWVzIGluY29ycmVjdGx5IGdldCByZXF1ZXN0QW5pbWF0aW9uRnJhbWUgdGhyb3R0bGVkCisg ICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xNzgzOTYKKwor ICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJZiBhIGNvbXBv c2l0ZWQgaWZyYW1lIHdhcyBpbnNpZGUgb3ZlcmZsb3c6c2Nyb2xsLCBhbmQgdGhlIG92ZXJmbG93 IHdhcyBzY3JvbGxlZCB0byB0aGUgbGVmdAorICAgICAgICBmdXJ0aGVyIHRoYW4gdGhlIHdpbmRv 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