implemented raw bitmap access for wxDFB

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47300 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dfb/bitmap.h

@@ -13,6 +13,8 @@
 
 #include "wx/dfb/dfbptr.h"
 
+class WXDLLIMPEXP_FWD_CORE wxPixelDataBase;
+
 wxDFB_DECLARE_INTERFACE(IDirectFBSurface);
 
 //-----------------------------------------------------------------------------
@@ -69,6 +71,12 @@ public:
 
     static void InitStandardHandlers();
 
+    // raw bitmap access support functions
+    void *GetRawData(wxPixelDataBase& data, int bpp);
+    void UngetRawData(wxPixelDataBase& data);
+
+    bool HasAlpha() const;
+
     // implementation:
     virtual void SetHeight(int height);
     virtual void SetWidth(int width);