Closed Bug 1158323 Opened 5 years ago Closed 4 years ago

Many "Attempting to get a margins-based displayport with no base data!" warnings in console on OS X with APZ


(Core :: Layout, defect)

Not set



Tracking Status
firefox40 --- fixed


(Reporter: kats, Assigned: kats)




(2 files, 1 obsolete file)

Attached file Backtrace
I see this warning a bunch when running on OS X with APZ enabled. It fires on the root content element of the root XUL document, see backtrace.
We should probably just call nsLayoutUtils::SetDisplayPortBase() in ChromeProcessController::InitializeRoot().
That would be good. We could also set the display port base in the BuildDisplayList of one of the frames near near the root, the root (viewport frame) perhaps.
mContent appears to be null inside nsViewportFrame::BuildDisplayList so I'm not sure how we could set the displayport base there.
Yeah, we would have to specifically use the root element in that case (instead of mContent).
Attached patch Patch (obsolete) — Splinter Review
Attachment #8598222 - Flags: review?(tnikkel)
Comment on attachment 8598222 [details] [diff] [review]

Review of attachment 8598222 [details] [diff] [review]:

Maybe add a comment in InitalizeRoot, saying where the base rect will be set?
Comment on attachment 8598222 [details] [diff] [review]

I think I have a better way to do it. If there is a root scroll frame in the same document as the viewport frame then we would end up setting the display port base twice, once in the viewport frame, and once in the scroll frame.

Refering to I think we should set the display port base in nsRootBoxFrame. That way we only set it in xul documents that don't have root scroll frames.

One nit: we should set the base to the dirty rect intersected with our local rect.
Attachment #8598222 - Flags: review?(tnikkel)
Attached patch PatchSplinter Review
Sounds good, this works too.
Assignee: nobody → bugmail.mozilla
Attachment #8598222 - Attachment is obsolete: true
Attachment #8598636 - Flags: review?(tnikkel)
Comment on attachment 8598636 [details] [diff] [review]

Attachment #8598636 - Flags: review?(tnikkel) → review+
Closed: 4 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla40
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