Mark wx apps as DPI aware on Windows 7/Vista.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63990 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/main.cpp

@@ -31,6 +31,7 @@
 #endif //WX_PRECOMP
 
 #include "wx/cmdline.h"
+#include "wx/dynlib.h"
 #include "wx/scopeguard.h"
 
 #include "wx/msw/private.h"
@@ -203,6 +204,9 @@ int wxEntry(int& argc, wxChar **argv)
 
 #if wxUSE_GUI && defined(__WXMSW__)
 
+namespace
+{
+
 #if wxUSE_UNICODE && !defined(__WXWINCE__)
     #define NEED_UNICODE_CHECK
 #endif
@@ -210,7 +214,7 @@ int wxEntry(int& argc, wxChar **argv)
 #ifdef NEED_UNICODE_CHECK
 
 // check whether Unicode is available
-static bool wxIsUnicodeAvailable()
+bool wxIsUnicodeAvailable()
 {
     static const wchar_t *ERROR_STRING = L"wxWidgets Fatal Error";
 
@@ -281,6 +285,21 @@ static bool wxIsUnicodeAvailable()
 
 #endif // NEED_UNICODE_CHECK
 
+void wxSetProcessDPIAware()
+{
+#if wxUSE_DYNLIB_CLASS
+    typedef BOOL (WINAPI *SetProcessDPIAware_t)(void);
+    wxDynamicLibrary dllUser32(wxT("user32.dll"));
+    SetProcessDPIAware_t pfnSetProcessDPIAware =
+        (SetProcessDPIAware_t)dllUser32.RawGetSymbol(wxT("SetProcessDPIAware"));
+
+    if ( pfnSetProcessDPIAware )
+        pfnSetProcessDPIAware();
+#endif // wxUSE_DYNLIB_CLASS
+}
+
+} //anonymous namespace
+
 // ----------------------------------------------------------------------------
 // Windows-specific wxEntry
 // ----------------------------------------------------------------------------
@@ -381,6 +400,13 @@ WXDLLEXPORT int wxEntry(HINSTANCE hInstance,
                         wxCmdLineArgType WXUNUSED(pCmdLine),
                         int nCmdShow)
 {
+    // wxWidgets library doesn't have problems with non-default DPI settings,
+    // so we can mark the app as "DPI aware" for Vista/Win7 (see
+    // http://msdn.microsoft.com/en-us/library/dd464659%28VS.85%29.aspx).
+    // Note that we intentionally do it here and not in wxApp, so that it
+    // doesn't happen if wx code is hosted in another app (e.g. a plugin).
+    wxSetProcessDPIAware();
+
     if ( !wxMSWEntryCommon(hInstance, nCmdShow) )
         return -1;