nothing sets mpSaveBackDev anymore

Change-Id: I6be6a1cbcb63510469d8c419433bf05bf4fde6e5

vcl/inc/window.h

@@ -104,7 +104,6 @@ struct ImplWinData
 
 struct ImplOverlapData
 {
-    VclPtr<VirtualDevice> mpSaveBackDev;          //< saved background bitmap
     vcl::Region*        mpSaveBackRgn;          //< saved region, which must be invalidated
     VclPtr<vcl::Window> mpNextBackWin;          //< next window with saved background
 };

vcl/source/window/clipping.cxx

@@ -809,66 +809,11 @@ void Window::SaveBackground( const Point& rPos, const Size& rSize,
 
 bool Window::ImplRestoreOverlapBackground( vcl::Region& rInvRegion )
 {
-    if ( mpWindowImpl->mpOverlapData->mpSaveBackDev )
-    {
-        if ( mpWindowImpl->mbInitWinClipRegion )
-            ImplInitWinClipRegion();
-
-        if ( mpWindowImpl->mpOverlapData->mpSaveBackDev )
-        {
-            Point   aDevPt;
-            Point   aDestPt( mnOutOffX, mnOutOffY );
-            Size    aDevSize = mpWindowImpl->mpOverlapData->mpSaveBackDev->GetOutputSizePixel();
-
-            Window *pWin = mpWindowImpl->mpFrameWindow;
-
-            if ( mpWindowImpl->mpOverlapData->mpSaveBackRgn )
-            {
-                mpWindowImpl->mpOverlapData->mpSaveBackRgn->Intersect( mpWindowImpl->maWinClipRegion );
-                rInvRegion = mpWindowImpl->maWinClipRegion;
-                rInvRegion.Exclude( *mpWindowImpl->mpOverlapData->mpSaveBackRgn );
-                pWin->drawFrameDev( aDestPt, aDevPt, aDevSize,
-                                    *(mpWindowImpl->mpOverlapData->mpSaveBackDev),
-                                    *mpWindowImpl->mpOverlapData->mpSaveBackRgn );
-            }
-            else
-            {
-                pWin->drawFrameDev( aDestPt, aDevPt, aDevSize,
-                                    *(mpWindowImpl->mpOverlapData->mpSaveBackDev),
-                                    mpWindowImpl->maWinClipRegion );
-            }
-            ImplDeleteOverlapBackground();
-        }
-
-        return true;
-    }
-
     return false;
 }
 
 void Window::ImplDeleteOverlapBackground()
 {
-    if ( mpWindowImpl->mpOverlapData->mpSaveBackDev )
-    {
-        mpWindowImpl->mpOverlapData->mpSaveBackDev.disposeAndClear();
-        if ( mpWindowImpl->mpOverlapData->mpSaveBackRgn )
-        {
-            delete mpWindowImpl->mpOverlapData->mpSaveBackRgn;
-            mpWindowImpl->mpOverlapData->mpSaveBackRgn = nullptr;
-        }
-
-        // remove window from the list
-        if ( mpWindowImpl->mpFrameData->mpFirstBackWin == this )
-            mpWindowImpl->mpFrameData->mpFirstBackWin = mpWindowImpl->mpOverlapData->mpNextBackWin;
-        else
-        {
-            vcl::Window* pTemp = mpWindowImpl->mpFrameData->mpFirstBackWin;
-            while ( pTemp->mpWindowImpl->mpOverlapData->mpNextBackWin.get() != this )
-                pTemp = pTemp->mpWindowImpl->mpOverlapData->mpNextBackWin;
-            pTemp->mpWindowImpl->mpOverlapData->mpNextBackWin = mpWindowImpl->mpOverlapData->mpNextBackWin;
-        }
-        mpWindowImpl->mpOverlapData->mpNextBackWin = nullptr;
-    }
 }
 
 void Window::ImplInvalidateAllOverlapBackgrounds()

vcl/source/window/paint.cxx

@@ -1061,8 +1061,6 @@ void Window::SetWindowRegionPixel()
             if ( IsReallyVisible() )
             {
                 // restore background storage
-                if ( mpWindowImpl->mpOverlapData && mpWindowImpl->mpOverlapData->mpSaveBackDev )
-                    ImplDeleteOverlapBackground();
                 if ( mpWindowImpl->mpFrameData->mpFirstBackWin )
                     ImplInvalidateAllOverlapBackgrounds();
                 Rectangle   aRect( Point( mnOutOffX, mnOutOffY ), Size( mnOutWidth, mnOutHeight ) );
@@ -1148,8 +1146,6 @@ void Window::SetWindowRegionPixel( const vcl::Region& rRegion )
         if ( IsReallyVisible() )
         {
             // restore background storage
-            if ( mpWindowImpl->mpOverlapData && mpWindowImpl->mpOverlapData->mpSaveBackDev )
-                ImplDeleteOverlapBackground();
             if ( mpWindowImpl->mpFrameData->mpFirstBackWin )
                 ImplInvalidateAllOverlapBackgrounds();
             Rectangle   aRect( Point( mnOutOffX, mnOutOffY ), Size( mnOutWidth, mnOutHeight ) );

vcl/source/window/window.cxx

@@ -934,7 +934,6 @@ void Window::ImplInit( vcl::Window* pParent, WinBits nStyle, SystemParentData* p
     if ( mpWindowImpl->mbOverlapWin )
     {
         mpWindowImpl->mpOverlapData                   = new ImplOverlapData;
-        mpWindowImpl->mpOverlapData->mpSaveBackDev    = nullptr;
         mpWindowImpl->mpOverlapData->mpSaveBackRgn    = nullptr;
         mpWindowImpl->mpOverlapData->mpNextBackWin    = nullptr;
     }
@@ -1754,8 +1753,6 @@ void Window::ImplPosSizeWindow( long nX, long nY,
             if ( bNewPos || bNewSize )
             {
                 // reset background storage
-                if ( mpWindowImpl->mpOverlapData && mpWindowImpl->mpOverlapData->mpSaveBackDev )
-                    ImplDeleteOverlapBackground();
                 if ( mpWindowImpl->mpFrameData->mpFirstBackWin )
                     ImplInvalidateAllOverlapBackgrounds();
                 // set Clip-Flag