[Webkit-unassigned] [Bug 32530] New: QtWebkit creates an unnecessary deep copy of images when canvas drawing is done

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32530

           Summary: QtWebkit creates an unnecessary deep copy of images
                    when canvas drawing is done
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: All
            Status: NEW
          Keywords: Qt
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: noam.rosenthal at nokia.com


Found while profiling http://deanm.github.com/pre3d/monster.html with valgrind:
about 50% of the time is spent in image copying, that is called from trying to
use the QPixmap copy constructor while a paint operation is active (see
qpixmap.cpp, line 275: make a deep copy).

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