[Webkit-unassigned] [Bug 89475] Blur filter causes issues when scrolling

Fri Jun 22 09:49:25 PDT 2012

https://bugs.webkit.org/show_bug.cgi?id=89475

--- Comment #6 from Chiculita Alexandru <achicu at adobe.com>  2012-06-22 09:49:24 PST ---
(In reply to comment #5)
> (In reply to comment #3)
> > I think this happens because of the subpixel layout. The issue doesn't seem to reproduce in Safari. I think that adding some pixelSnappedIntRect would fix the issue. I will take a look.
> 
> Just FYI, I was able to repro this in Safari (WebKit nightly), although it may not be captured by this test case.  Simply open Facebook or Google+, apply a -webkit-filter: blur(1px); to the <body> element, and scroll.

You're right. I was trying in a Chrome Dev build and the only thing I've seen were some white lines around the repaint rectangles, so I thought it was from the subpixel. That issue seems to be fixed in the nightly.

The current issue is from the the FrameView scrolling mechanism which is trying to move things around while scrolling instead of repainting. That only happens when it is possible to be done, but in this case it is not possible.

I will post a patch today.

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