diff --git a/include/wx/gdicmn.h b/include/wx/gdicmn.h
index 154c6652c4..012a90e61f 100644
--- a/include/wx/gdicmn.h
+++ b/include/wx/gdicmn.h
@@ -255,10 +255,12 @@ public:
         { if ( sz.x < x ) x = sz.x; if ( sz.y < y ) y = sz.y; }
 
     void IncBy(int dx, int dy) { x += dx; y += dy; }
+    void IncBy(const wxPoint& pt);
     void IncBy(const wxSize& sz) { IncBy(sz.x, sz.y); }
     void IncBy(int d) { IncBy(d, d); }
 
     void DecBy(int dx, int dy) { IncBy(-dx, -dy); }
+    void DecBy(const wxPoint& pt);
     void DecBy(const wxSize& sz) { DecBy(sz.x, sz.y); }
     void DecBy(int d) { DecBy(d, d); }
 
@@ -396,7 +398,7 @@ public:
     wxRealPoint() : x(0.0), y(0.0) { }
     wxRealPoint(double xx, double yy) : x(xx), y(yy) { }
     wxRealPoint(const wxPoint& pt);
-    
+
     // no copy ctor or assignment operator - the defaults are ok
 
     //assignment operators
@@ -827,6 +829,11 @@ inline bool wxRect::Inside(const wxRect& rect) const { return Contains(rect); }
 #endif // WXWIN_COMPATIBILITY_2_6
 
 
+// define functions which couldn't be defined above because of declarations
+// order
+inline void wxSize::IncBy(const wxPoint& pt) { IncBy(pt.x, pt.y); }
+inline void wxSize::DecBy(const wxPoint& pt) { DecBy(pt.x, pt.y); }
+
 // ---------------------------------------------------------------------------
 // Management of pens, brushes and fonts
 // ---------------------------------------------------------------------------
diff --git a/interface/wx/gdicmn.h b/interface/wx/gdicmn.h
index 43a4aa596f..ff7b44b486 100644
--- a/interface/wx/gdicmn.h
+++ b/interface/wx/gdicmn.h
@@ -113,10 +113,10 @@ enum wxStockCursor
 
     A wxRealPoint is a useful data structure for graphics operations.
 
-    It contains floating point @e x and @e y members. 
+    It contains floating point @e x and @e y members.
     See wxPoint for an integer version.
 
-    Note that the coordinates stored inside a wxRealPoint object may be negative 
+    Note that the coordinates stored inside a wxRealPoint object may be negative
     and that wxRealPoint functions do not perform any check against negative values.
 
     @library{wxcore}
@@ -136,7 +136,7 @@ public:
         Initializes the point with the given coordinates.
     */
     wxRealPoint(double x, double y);
-    
+
     /**
         Converts the given wxPoint (with integer coordinates) to a wxRealPoint.
     */
@@ -144,7 +144,7 @@ public:
 
     /**
         @name Miscellaneous operators
-        
+
         Note that these operators are documented as class members
         (to make them easier to find) but, as their prototype shows,
         they are implemented as global operators; note that this is
@@ -171,14 +171,14 @@ public:
 
     wxRealPoint& operator +=(const wxSize& sz);
     wxRealPoint& operator -=(const wxSize& sz);
-    
+
     wxSize operator /(const wxRealPoint& sz, int factor);
     wxSize operator *(const wxRealPoint& sz, int factor);
     wxSize operator *(int factor, const wxSize& sz);
     wxSize& operator /=(int factor);
     wxSize& operator *=(int factor);
     //@}
-    
+
     /**
         X coordinate of this point.
     */
@@ -197,8 +197,8 @@ public:
 
     A class for manipulating rectangles.
 
-    Note that the x, y coordinates and the width and height stored inside a wxRect 
-    object may be negative and that wxRect functions do not perform any check against 
+    Note that the x, y coordinates and the width and height stored inside a wxRect
+    object may be negative and that wxRect functions do not perform any check against
     negative values.
 
     @library{wxcore}
@@ -511,7 +511,7 @@ public:
 
     A wxPoint is a useful data structure for graphics operations.
 
-    It contains integer @e x and @e y members. 
+    It contains integer @e x and @e y members.
     See wxRealPoint for a floating point version.
 
     Note that the width and height stored inside a wxPoint object may be negative
@@ -534,12 +534,12 @@ public:
         Initializes the internal x and y coordinates to zero.
     */
     wxPoint();
-    
+
     /**
         Initializes the point object with the given @a x and @a y coordinates.
     */
     wxPoint(int x, int y);
-    
+
     /**
         Converts the given wxRealPoint (with floating point coordinates) to a
         wxPoint instance.
@@ -548,7 +548,7 @@ public:
 
     /**
         @name Miscellaneous operators
-        
+
         Note that these operators are documented as class members
         (to make them easier to find) but, as their prototype shows,
         they are implemented as global operators; note that this is
@@ -575,14 +575,14 @@ public:
 
     wxPoint& operator +=(const wxSize& sz);
     wxPoint& operator -=(const wxSize& sz);
-    
+
     wxSize operator /(const wxPoint& sz, int factor);
     wxSize operator *(const wxPoint& sz, int factor);
     wxSize operator *(int factor, const wxSize& sz);
     wxSize& operator /=(int factor);
     wxSize& operator *=(int factor);
     //@}
-    
+
     /**
         x member.
     */
@@ -727,9 +727,9 @@ public:
 /**
     @class wxSize
 
-    A wxSize is a useful data structure for graphics operations. 
+    A wxSize is a useful data structure for graphics operations.
     It simply contains integer @e width and @e height members.
-    
+
     Note that the width and height stored inside a wxSize object may be negative
     and that wxSize functions do not perform any check against negative values
     (this is used to e.g. store the special -1 value in ::wxDefaultSize instance).
@@ -760,7 +760,7 @@ public:
         Initializes this size object with zero width and height.
     */
     wxSize();
-    
+
     /**
         Initializes this size object with the given @a width and @a height.
     */
@@ -772,6 +772,7 @@ public:
 
         @see IncBy()
     */
+    void DecBy(const wxPoint& pt);
     void DecBy(const wxSize& size);
     void DecBy(int dx, int dy);
     void DecBy(int d);
@@ -801,6 +802,7 @@ public:
 
         @see DecBy()
     */
+    void IncBy(const wxPoint& pt);
     void IncBy(const wxSize& size);
     void IncBy(int dx, int dy);
     void IncBy(int d);
@@ -864,10 +866,10 @@ public:
     */
     void SetWidth(int width);
 
-    
+
     /**
         @name Miscellaneous operators
-        
+
         Note that these operators are documented as class members
         (to make them easier to find) but, as their prototype shows,
         they are implemented as global operators; note that this is