defer dc screen grab until blit

include/wx/qt/dc.h

@@ -111,6 +111,8 @@ public:
     virtual void* GetHandle() const { return (void*) m_qtPainter; }
 
 protected:
+    virtual QImage *GetQImage() { return m_qtImage; }
+    
     QPainter *m_qtPainter;
     QImage *m_qtImage;
 

include/wx/qt/dcclient.h

@@ -20,9 +20,6 @@ public:
 
 protected:
     wxWindow *m_window;
-
-private:
-
 };
 
 

include/wx/qt/dcmemory.h

@@ -24,8 +24,6 @@ public:
     virtual const wxBitmap& GetSelectedBitmap() const;
     virtual wxBitmap& GetSelectedBitmap();
 
-protected:
-
 private:
     wxBitmap m_selected;
 };

include/wx/qt/dcscreen.h

@@ -17,9 +17,11 @@ public:
 
     ~wxScreenDCImpl();
 
+protected:
     virtual void DoGetSize(int *width, int *height) const wxOVERRIDE;
+    virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
 
-private:
+    QImage *GetQImage();
 
     wxDECLARE_ABSTRACT_CLASS(wxScreenDCImpl);
 };