Add wx headers and ext

wxheaders/wx/msw/private/dcdynwrap.h

@@ -0,0 +1,39 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/private/dcdynwrap.h
+// Purpose:     Private dynamically loaded HDC-related functions
+// Author:      Vadim Zeitlin
+// Created:     2016-05-26 (extracted from src/msw/dc.cpp)
+// Copyright:   (c) 2016 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_PRIVATE_DCDYNWRAP_H_
+#define _WX_MSW_PRIVATE_DCDYNWRAP_H_
+
+#include "wx/msw/wrapwin.h"
+
+// Namespace for the wrapper functions, hopefully one day we'll be able to get
+// rid of all of them and then it will be easy to find all occurrences of their
+// use by just searching for this namespace name.
+//
+// All of the functions in this namespace must work *exactly* like the standard
+// functions with the same name and just return an error if dynamically loading
+// them failed.
+//
+// And they're all implemented in src/msw/dc.cpp.
+namespace wxDynLoadWrappers
+{
+
+DWORD GetLayout(HDC hdc);
+DWORD SetLayout(HDC hdc, DWORD dwLayout);
+
+BOOL AlphaBlend(HDC hdcDest, int xDest, int yDest, int wDest, int hDest,
+                HDC hdcSrc, int xSrc, int ySrc, int wSrc, int hSrc,
+                BLENDFUNCTION bf);
+
+BOOL GradientFill(HDC hdc, PTRIVERTEX pVert, ULONG numVert,
+                  PVOID pMesh, ULONG numMesh, ULONG mode);
+
+} // namespace wxDynLoadWrappers
+
+#endif // _WX_MSW_PRIVATE_DCDYNWRAP_H_