For wxMSW, split XPM handler into separate file (please add handler explicitly in app);

doc changes espec. wxBitmap overview


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1416 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/pnghand.h

@@ -13,6 +13,9 @@
 #pragma interface "pnghand.h"
 #endif
 
+#ifndef _WX_PNGHAND_H_
+#define _WX_PNGHAND_H_
+
 class WXDLLEXPORT wxPNGFileHandler: public wxBitmapHandler
 {
   DECLARE_DYNAMIC_CLASS(wxPNGFileHandler)
@@ -29,3 +32,6 @@ public:
   virtual bool SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *palette = NULL);
 };
 
+#endif
+  // _WX_PNGHAND_H_
+