[Webkit-unassigned] [Bug 58512] New: Calls to WebCore::Document::mayCauseFlashOfUnstyledContent make frequently-run drawing methods slower

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58512

           Summary: Calls to
                    WebCore::Document::mayCauseFlashOfUnstyledContent make
                    frequently-run drawing methods slower
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ianh at apple.com
                CC: morrita at google.com


In https://bugs.webkit.org/show_bug.cgi?id=45640, we added a more complicated heuristic to determine whether drawing may cause a flash of unstyled content.  The WebCore::Document::mayCauseFlashOfUnstyledContent method is called during every WebCore::RenderBlock::paintContents and WebCore::RenderLayer::paintLayer, both of which may be called many times on a complex page.  The additional complexity adds measurable overhead to these methods.

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