[Webkit-unassigned] [Bug 32933] New: WebKit hang while snapshoting this page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32933

           Summary: WebKit hang while snapshoting this page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://blog.oup.com/2009/11/unfriend/
        OS/Version: Windows Vista
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Printing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tiansjun at hotmail.com


URL: http://blog.oup.com/2009/11/unfriend/ 
I try to capture the webpage after loading but it hangs and CPU runs to 100%.
It works well for most other pages.

This is my codes in QtWebKit(r50477 + Qt4.6.0 + GCC4.4.0).

    // set the viewport size to the whole webpage size
    m_webview->page()->setViewportSize ( tmpSize );  
    //disable scrollbar
   
m_webview->page()->mainFrame()->setScrollBarPolicy(Qt::Horizontal,Qt::ScrollBarAlwaysOff); 
   
m_webview->page()->mainFrame()->setScrollBarPolicy(Qt::Vertical,Qt::ScrollBarAlwaysOff); 
    //paint webpage into image
    QImage im ( tmpSize , QImage::Format_RGB888); //QImage::Format_RGB32
    QPainter painter ( & im );
    m_webview->page()->mainFrame()->render ( & painter ); 

The tree i have tracked:
.....QWebFramePrivate::renderPrivate(QPainter *painter, QWebFrame::RenderLayer
layer, const QRegion &clip)           
...........WebCore::FrameView::paintContents(GraphicsContext* p, const IntRect&
rect)
................contentRenderer->layer()->paint(p, rect, m_paintRestriction,
eltRenderer); //void RenderLayer::paint
......................void RenderLayer::paintLayer(....)
...........................void RenderBlock::paint(PaintInfo& paintInfo, int
tx, int ty)
...............................void RenderBlock::paintObject(PaintInfo&
paintInfo, int tx, int ty)
....................................paintBoxDecorations(paintInfo, tx, ty); 
//hang here now....

I am not familiar with the WebKit rendering codes. It is too hard for me now.
Please help to fix this bug. Thanks.

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