+ // The clipping nesting level is incremented by every call to
+ // SetClippingRegion() and reset when DestroyClippingRegion() is called.
+ size_t m_clipNestingLevel;
+
+ // Unique ID for every clipping graphics group: this is simply always
+ // incremented in each SetClippingRegion() call.
+ size_t m_clipUniqueId;
+