extracted code including gdiplus.h in a separate header

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44815 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/wrapgdip.h

@@ -0,0 +1,32 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/wrapgdip.h
+// Purpose:     wrapper around <gdiplus.h> header
+// Author:      Vadim Zeitlin
+// Created:     2007-03-15
+// RCS-ID:      $Id$
+// Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_WRAPGDIP_H_
+#define _WX_MSW_WRAPGDIP_H_
+
+#include "wx/msw/wrapwin.h"
+
+// these macros must be defined before gdiplus.h is included but we explicitly
+// prevent windows.h from defining them in wx/msw/wrapwin.h as they conflict
+// with standard functions of the same name elsewhere, so we have to pay for it
+// by manually redefining them ourselves here
+#ifndef max
+    #define max(a,b)            (((a) > (b)) ? (a) : (b))
+#endif
+
+#ifndef min
+    #define min(a,b)            (((a) < (b)) ? (a) : (b))
+#endif
+
+#include <gdiplus.h>
+using namespace Gdiplus;
+
+#endif // _WX_MSW_WRAPGDIP_H_
+