[Webkit-unassigned] [Bug 66382] LayerTilerChromium: Grow layers with tile granularity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66382





--- Comment #7 from James Robinson <jamesr at chromium.org>  2011-08-17 13:05:01 PST ---
(In reply to comment #6)
> I added some logging to WebCore::LayerTilerChromium::prepareToUpdate to track paint events. Navigating to http://bbc.co.uk with a 1280x664 window I see both large paints events covering the whole viewport (x:0, y:0, w:1280, h:664) as well as smaller rects inside the viewport as the page elements load.
> 
> Scrolling the page down slowly, I then see these kinds of events:
> 
>  - (0, 0, 1280, 664)
>  - (0, 2, 1280, 666)
>  - (0, 4, 1280, 668)
>  - (0, 6, 1280, 670)
>  - etc.
> 
> These rects get passed to growLayerToContain(), so the layer grows with pixel granularity rather than tile granularity.

This is with --force-compositing-mode, right?  I don't see this behavior either on trunk or the m14 branch.  bbc.co.uk is also a pretty busy page with animations going on so it's not the best page to test on.

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