Add wx headers and ext

wxheaders/wx/msw/private/dpiaware.h

@@ -0,0 +1,83 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/private/dpiaware.h
+// Purpose:     AutoSystemDpiAware class
+// Author:      Maarten Bent
+// Created:     2016-10-06
+// Copyright:   (c) Maarten Bent
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_DPI_AWARE_H_
+#define _WX_MSW_DPI_AWARE_H_
+
+#ifndef WX_PRECOMP
+    #include "wx/msw/missing.h"
+#endif
+
+#include "wx/dynlib.h"
+
+#if wxUSE_DYNLIB_CLASS
+
+namespace wxMSWImpl
+{
+
+// ----------------------------------------------------------------------------
+// Temporarily change the DPI Awareness context to GDIScaled or System
+// ----------------------------------------------------------------------------
+
+class AutoSystemDpiAware
+{
+    #define WXDPI_AWARENESS_CONTEXT_UNAWARE           ((WXDPI_AWARENESS_CONTEXT)-1)
+    #define WXDPI_AWARENESS_CONTEXT_SYSTEM_AWARE      ((WXDPI_AWARENESS_CONTEXT)-2)
+    #define WXDPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED ((WXDPI_AWARENESS_CONTEXT)-5)
+    typedef WXDPI_AWARENESS_CONTEXT
+            (WINAPI *SetThreadDpiAwarenessContext_t)(WXDPI_AWARENESS_CONTEXT);
+
+public:
+    AutoSystemDpiAware()
+        : m_prevContext(WXDPI_AWARENESS_CONTEXT_UNAWARE)
+    {
+        if ( ms_pfnSetThreadDpiAwarenessContext == (SetThreadDpiAwarenessContext_t)-1)
+        {
+            wxLoadedDLL dllUser32("user32.dll");
+            wxDL_INIT_FUNC(ms_pfn, SetThreadDpiAwarenessContext, dllUser32);
+        }
+
+        if ( ms_pfnSetThreadDpiAwarenessContext )
+        {
+            m_prevContext = ms_pfnSetThreadDpiAwarenessContext(
+                                    WXDPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED);
+            if ( !m_prevContext )
+            {
+                m_prevContext = ms_pfnSetThreadDpiAwarenessContext(
+                                    WXDPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
+            }
+        }
+
+    }
+
+    ~AutoSystemDpiAware()
+    {
+        if ( ms_pfnSetThreadDpiAwarenessContext )
+        {
+            ms_pfnSetThreadDpiAwarenessContext(m_prevContext);
+        }
+    }
+
+private:
+    WXDPI_AWARENESS_CONTEXT m_prevContext;
+
+    // This static member is defined in src/msw/window.cpp.
+    static SetThreadDpiAwarenessContext_t ms_pfnSetThreadDpiAwarenessContext;
+};
+
+#else // !wxUSE_DYNLIB_CLASS
+
+// Just a stub to avoid littering the code with wxUSE_DYNLIB_CLASS checks.
+class AutoSystemDpiAware { };
+
+#endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
+
+} // namespace wxMSWImpl
+
+#endif // _WX_MSW_DPI_AWARE_H_