1 files changed, 17 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/qwindowswindowclassdescription.h b/src/plugins/platforms/windows/qwindowswindowclassdescription.h
index 9423abf9d2d..f0019f8f3c2 100644
--- a/src/plugins/platforms/windows/qwindowswindowclassdescription.h
+++ b/src/plugins/platforms/windows/qwindowswindowclassdescription.h
@@ -14,6 +14,14 @@ class QWindow;
 
 struct QWindowsWindowClassDescription
 {
+    enum class WindowStyleOption
+    {
+        None = 0x00,
+        GLSurface = 0x01,
+        DropShadow = 0x02
+    };
+    Q_DECLARE_FLAGS(WindowStyleOptions, WindowStyleOption)
+
     static QWindowsWindowClassDescription fromName(QString name, WNDPROC procedure);
     static QWindowsWindowClassDescription fromWindow(const QWindow *window, WNDPROC procedure);
 
@@ -23,8 +31,17 @@ struct QWindowsWindowClassDescription
     HBRUSH brush{ nullptr };
     bool hasIcon{ false };
     bool shouldAddPrefix{ true };
+
+private:
+    static QString classNameSuffix(Qt::WindowFlags type, unsigned int style, bool hasIcon);
+    static bool computeHasIcon(Qt::WindowFlags flags, Qt::WindowFlags type);
+    static unsigned int computeWindowStyles(Qt::WindowFlags flags, Qt::WindowFlags type, WindowStyleOptions options);
+
+    friend QDebug operator<<(QDebug dbg, const QWindowsWindowClassDescription &description);
 };
 
+Q_DECLARE_OPERATORS_FOR_FLAGS(QWindowsWindowClassDescription::WindowStyleOptions)
+
 QT_END_NAMESPACE
 
 #endif // QWINDOWSWINDOWCLASSDESCRIPTION_H