OffscreenDrawingContext: Implement ResyncDrawState()

This is called whenever the DrawState is modified, so that it gets applied
to the DrawingEngine. Otherwise, the DrawingEngine works with an out-dated
state.

src/servers/app/DrawingContext.cpp

@@ -320,6 +320,14 @@ OffscreenContext::OffscreenContext(DrawingEngine* engine,
 	:
 	DrawingContext(state),
 	fDrawingEngine(engine)
+{
+	ResyncDrawState();
+}
+
+
+void
+OffscreenContext::ResyncDrawState()
 {
 	fDrawingEngine->SetDrawState(fDrawState);
 }
+

src/servers/app/DrawingContext.h

@@ -90,17 +90,18 @@ public:
 							// Screen and View coordinates are the same for us.
 							// DrawState already takes care of World<>View
 							// conversions.
-			void			ConvertToScreen(BPoint*) const {}
-			void			ConvertToScreen(IntPoint*) const {}
-			void			ConvertToScreen(BRect*) const {}
-			void			ConvertToScreen(IntRect*) const {}
-			void			ConvertToScreen(BRegion*) const {}
-			void			ConvertFromScreen(BPoint*) const {}
+	virtual void			ConvertToScreen(BPoint*) const {}
+	virtual void			ConvertToScreen(IntPoint*) const {}
+	virtual void			ConvertToScreen(BRect*) const {}
+	virtual void			ConvertToScreen(IntRect*) const {}
+	virtual void			ConvertToScreen(BRegion*) const {}
+	virtual void			ConvertFromScreen(BPoint*) const {}
 
-			DrawingEngine*	GetDrawingEngine() const { return fDrawingEngine; }
+	virtual DrawingEngine*	GetDrawingEngine() const { return fDrawingEngine; }
 
-			void			RebuildClipping(bool deep) { /* TODO */ }
-			ServerPicture*	GetPicture(int32 token) const
+	virtual void			RebuildClipping(bool deep) { /* TODO */ }
+	virtual void			ResyncDrawState();
+	virtual ServerPicture*	GetPicture(int32 token) const
 								{ /* TODO */ return NULL; }
 private:
 			DrawingEngine*	fDrawingEngine;