[Webkit-unassigned] [Bug 50527] New: [Qt] Background image rendering is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50527

           Summary: [Qt] Background image rendering is slow
           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: noam.rosenthal at nokia.com
                CC: hausmann at webkit.org, kenneth at webkit.org,
                    benjamin.poulain at nokia.com, kling at webkit.org


Even on desktop, it is evident (using WebInspector, valgrind and Shark) that background image rendering is a bottleneck.
LayoutTests/fast/backgrounds/size/backgroundSize02.html, for example, takes 17ms to paint on a 1440x960 window.

This is due to the use of fillRect with a transformed brush, which is an unoptimized code path in Qt.

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