Fix build with -directwrite

There were several issues caught by GCC:
* deleting object of polymorphic class type which has non-virtual
  destructor might cause undefined behaviour
* comparison between signed and unsigned integer expressions
* 'GetUserDefaultLocaleName' was not declared in this scope
  (depends on WINVER >= 0x0600)

Change-Id: I39f2cc0d5e158f4d85377edd55e9f74a512c7303
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
index 85cd92b234..75449e22ed 100644
--- a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
@@ -33,6 +33,10 @@
 
 #ifndef QT_NO_DIRECTWRITE
 
+#if WINVER < 0x0600
+#  undef WINVER
+#  define WINVER 0x0600
+#endif
 #if _WIN32_WINNT < 0x0600
 #undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0600
@@ -61,10 +65,14 @@ namespace {
     class GeometrySink: public IDWriteGeometrySink
     {
     public:
-        GeometrySink(QPainterPath *path) : m_path(path), m_refCount(0)
+        GeometrySink(QPainterPath *path)
+            : m_refCount(0), m_path(path)
         {
             Q_ASSERT(m_path != 0);
         }
+        virtual ~GeometrySink()
+        {
+        }
 
         IFACEMETHOD_(void, AddBeziers)(const D2D1_BEZIER_SEGMENT *beziers, UINT bezierCount);
         IFACEMETHOD_(void, AddLines)(const D2D1_POINT_2F *points, UINT pointCount);