725927 - nsGfxScrollFrameInner::UpdateOverflow cause thebesLayers reflow for poster-circle and other famous examples

Status: RESOLVED DUPLICATE of bug 689504

(Core :: Layout, defect)

Description

[Oleg Romashin (:romaxa)]

probably value 34 is specific for my environment, but with http://romaxa.info/tests/poster-circle2.html I have thebesLayers content repainting on every animation paint.
if I change font-size to 33 or remove text, then it works fast and smooth.

Also I noticed with the same testcase if I remove text and change perspective from 0px to 800px, then I have invalidates happening again...

any ideas what kind of dark magic happens here?

Comment 1

[Oleg Romashin (:romaxa)]

Minor traking of reflow operations show me this backtrace:

#0  PresShell::FrameNeedsReflow (this=0x3fc95370, aFrame=0x413a9fe0, aIntrinsicDirty=nsIPresShell::eResize, aBitToAdd=1024)
    at layout/base/nsPresShell.cpp:2877
#1  0x3b07780c in nsGfxScrollFrameInner::UpdateOverflow (this=0x413aa030)
    at layout/generic/nsGfxScrollFrame.cpp:3330
#2  0x3afefd2c in nsCSSFrameConstructor::ProcessRestyledFrames (this=0x41677200, aChangeList=...)
    at layout/base/nsCSSFrameConstructor.cpp:8013
#3  0x3aff0054 in nsCSSFrameConstructor::RestyleElement (this=0x41677200, aElement=<value optimized out>, aPrimaryFrame=0x4208ea80, 
    aMinHint=0, aRestyleTracker=..., aRestyleDescendants=false)
    at layout/base/nsCSSFrameConstructor.cpp:8091
#4  0x3afde8ec in mozilla::css::RestyleTracker::ProcessOneRestyle (this=0x41677340, aElement=0xae838214, 
    aRestyleHint=<value optimized out>, aChangeHint=0)