[Webkit-unassigned] [Bug 54141] New: WKView draws at wrong size, performs badly if is resized while hidden (assertion fails in BackingStore::incorporateUpdate in Debug builds)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54141

           Summary: WKView draws at wrong size, performs badly if is
                    resized while hidden (assertion fails in
                    BackingStore::incorporateUpdate in Debug builds)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: andersca at apple.com


If a WKView is resized while hidden, then shown again, it will repaint at whatever size it had before it was hidden, and will generally perform badly. In Debug builds, you'll hit an assertion in BackingStore::incorporateUpdate:

    ASSERT(m_size == updateInfo.viewSize);

Here's the backtrace:

>	WebKit.dll!WebKit::BackingStore::incorporateUpdate(const WebKit::UpdateInfo & updateInfo={...})  Line 58 + 0x35 bytes	C++
     WebKit.dll!WebKit::DrawingAreaProxyImpl::incorporateUpdate(const WebKit::UpdateInfo & updateInfo={...})  Line 207    C++
     WebKit.dll!WebKit::DrawingAreaProxyImpl::update(unsigned __int64 sequenceNumber=3, const WebKit::UpdateInfo & updateInfo={...})  Line 142    C++
     WebKit.dll!CoreIPC::callMemberFunction<WebKit::DrawingAreaProxy,void (__thiscall WebKit::DrawingAreaProxy::*)(unsigned __int64,WebKit::UpdateInfo const &),unsigned __int64,WebKit::UpdateInfo>(const CoreIPC::Arguments2<unsigned __int64,WebKit::UpdateInfo> & args={...}, WebKit::DrawingAreaProxy * object=0x05389238, void (unsigned __int64, const WebKit::UpdateInfo &)* function=0x0065cab3)  Line 25 + 0x19 bytes    C++
     WebKit.dll!CoreIPC::handleMessage<Messages::DrawingAreaProxy::Update,WebKit::DrawingAreaProxy,void (__thiscall WebKit::DrawingAreaProxy::*)(unsigned __int64,WebKit::UpdateInfo const &)>(CoreIPC::ArgumentDecoder * argumentDecoder=0x053fede8, WebKit::DrawingAreaProxy * object=0x05389238, void (unsigned __int64, const WebKit::UpdateInfo &)* function=0x0065cab3)  Line 246 + 0x11 bytes    C++
     WebKit.dll!WebKit::DrawingAreaProxy::didReceiveDrawingAreaProxyMessage(CoreIPC::Connection * __formal=0x05392c98, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x053fede8)  Line 41 + 0x12 bytes    C++
     WebKit.dll!WebKit::WebPageProxy::didReceiveMessage(CoreIPC::Connection * connection=0x05392c98, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x053fede8)  Line 1169    C++
     WebKit.dll!WebKit::WebProcessProxy::didReceiveMessage(CoreIPC::Connection * connection=0x05392c98, CoreIPC::MessageID messageID={...}, CoreIPC::ArgumentDecoder * arguments=0x053fede8)  Line 245    C++
     WebKit.dll!CoreIPC::Connection::dispatchMessages()  Line 450 + 0x31 bytes    C++
     WebKit.dll!MemberFunctionWorkItem0<CoreIPC::Connection>::execute()  Line 76 + 0x10 bytes    C++
     WebKit.dll!RunLoop::performWork()  Line 63 + 0x1a bytes    C++
     WebKit.dll!RunLoop::wndProc(HWND__ * hWnd=0x00140564, unsigned int message=1025, unsigned int wParam=85650232, long lParam=0)  Line 57    C++
     WebKit.dll!RunLoop::RunLoopWndProc(HWND__ * hWnd=0x00140564, unsigned int message=1025, unsigned int wParam=85650232, long lParam=0)  Line 39 + 0x18 bytes    C++

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.