[Webkit-unassigned] [Bug 33150] New: Do not render the full frame when there is some elements with fixed positioning

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33150

           Summary: Do not render the full frame when there is some
                    elements with fixed positioning
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Keywords: Performance, Qt
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: benjamin.poulain at nokia.com


Currently, when an element has a fixed position, ScrollViewcanBlitOnScroll() is
false and the full view is updated on scrolling. This slow down the scrolling
of any page with fixed elements (facebook, slashdot, etc).

We could update the part that appear on the screen, and the pixels of the fixed
elements that has been blitted.

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