[Webkit-unassigned] [Bug 52714] New: Scrolling in compositing mode naively repaints non-composited parts of the page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52714

           Summary: Scrolling in compositing mode naively repaints
                    non-composited parts of the page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: simon.fraser at apple.com, cmarrin at apple.com


The implementation of WebView::scrollBackingStore just calls m_backingLayer->setNeedsDisplayInRect(scrollViewRect), which will cause the non-composited parts of the page that intersect scrollViewRect to be repainted. This is a naive approach; it would be faster just to blit the contents into their new location and repaint only the newly-exposed contents.

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