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/dfb/private/overlay.h

@@ -0,0 +1,51 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/dfb/private/overlay.h
+// Purpose:     wxOverlayImpl declaration
+// Author:      Vaclav Slavik
+// Created:     2006-10-20
+// RCS-ID:      $Id$
+// Copyright:   (c) wxWidgets team
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DFB_PRIVATE_OVERLAY_H_
+#define _WX_DFB_PRIVATE_OVERLAY_H_
+
+#include "wx/dfb/dfbptr.h"
+
+wxDFB_DECLARE_INTERFACE(IDirectFBSurface);
+
+class WXDLLEXPORT wxWindow;
+
+
+class wxOverlayImpl
+{
+public:
+    wxOverlayImpl();
+    ~wxOverlayImpl();
+
+    void Reset();
+    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);
+
+    // wxDFB specific methods:
+    bool IsEmpty() const { return m_isEmpty; }
+    wxRect GetRect() const { return m_rect; }
+    wxIDirectFBSurfacePtr GetDirectFBSurface() const { return m_surface; }
+
+public:
+    // window the overlay is associated with
+    wxWindow *m_window;
+    // rectangle covered by the overlay, in m_window's window coordinates
+    wxRect m_rect;
+    // surface of the overlay, same size as m_rect
+    wxIDirectFBSurfacePtr m_surface;
+    // this flag is set to true if nothing was drawn on the overlay (either
+    // initially or Clear() was called)
+    bool m_isEmpty;
+};
+
+#endif // _WX_DFB_PRIVATE_OVERLAY_H_