[Webkit-unassigned] [Bug 124396] Few webpages flicker(shift in offset) while scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=124396


Sergio Correia (qrwteyrutiyoup) <sergio.correia at openbossa.org> changed:

           What    |Removed                     |Added
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                 CC|                            |eunmi15.lee at samsung.com




--- Comment #7 from Sergio Correia (qrwteyrutiyoup) <sergio.correia at openbossa.org>  2013-11-19 05:29:22 PST ---
(In reply to comment #6)
> (In reply to comment #5)
> > Pra(In reply to comment #0)
> > > In a few webpages where content scale factor is not equal to 1, UI position of content(visible rectangle offset) in webpage is saved after scaling. So, the display offset and content position as saved in WebView are not equal. Whenever there is a request to update viewsize port, the values stored as content position are passed for displaying without rescaling it back. This changes display offset and hence flickers.
> > Would you have any website to give as an example, that demonstrate this problem?
> 
> I was going through http://www.rediff.com. While scrolling, we can observe blinking effect mentioned in this bug. I have tested this patch on EFL port and it seems to have fixed the problem.

Thanks. I am going to test it on EFL and Nix Minibrowser (as we also use Coordinated Graphics). I have added EunMi Lee, since his patch at https://bugs.webkit.org/show_bug.cgi?id=118548 is almost identical to this one. He might have insights on this issue.

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