moved wxOverlay into overlay.* files and out of dc.h/dcbase.cpp; implemented wxOverlay for wxDirectFB port

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42340 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/private/overlay.h

@@ -0,0 +1,58 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/mac/carbon/private/overlay.h
+// Purpose:     wxOverlayImpl declaration
+// Author:      Stefan Csomor
+// Modified by:
+// Created:     2006-10-20
+// RCS-ID:      $Id$
+// Copyright:   (c) wxWidgets team
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MAC_CARBON_PRIVATE_OVERLAY_H_
+#define _WX_MAC_CARBON_PRIVATE_OVERLAY_H_
+
+#include "wx/mac/private.h"
+#include "wx/toplevel.h"
+#include "wx/graphics.h"
+
+class wxOverlayImpl
+{
+public:
+    wxOverlayImpl() ;
+    ~wxOverlayImpl() ;
+    
+    
+    // clears the overlay without restoring the former state
+    // to be done eg when the window content has been changed and repainted
+    void Reset();
+    
+    // returns true if it has been setup
+    bool IsOk();
+    
+    void Init( wxWindowDC* dc, int x , int y , int width , int height );
+    
+    void BeginDrawing( wxWindowDC* dc);
+    
+    void EndDrawing( wxWindowDC* dc);
+    
+    void Clear( wxWindowDC* dc);
+
+private:
+    OSStatus CreateOverlayWindow();
+    
+    void MacGetBounds( Rect *bounds );
+    
+    WindowRef m_overlayWindow;
+    WindowRef m_overlayParentWindow;
+    CGContextRef m_overlayContext ;
+    // we store the window in case we would have to issue a Refresh()
+    wxWindow* m_window ;
+    
+    int m_x ;
+    int m_y ;
+    int m_width ;
+    int m_height ;
+} ;
+
+#endif // _WX_MAC_CARBON_PRIVATE_OVERLAY_H_