adding magnification API into the wxWindow classes for best retina support

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74247 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/cocoa/private.h

@@ -247,6 +247,8 @@ public :
 
     virtual void WindowToScreen( int *x, int *y );
 
+    virtual double GetMagnificationFactor() const;
+
     virtual bool IsActive();
 
     virtual void SetModified(bool modified);

include/wx/osx/core/private.h

@@ -873,6 +873,8 @@ public :
     virtual void ScreenToWindow( int *x, int *y ) = 0;
 
     virtual void WindowToScreen( int *x, int *y ) = 0;
+    
+    virtual double GetMagnificationFactor() const { return 1.0; }
 
     virtual bool IsActive() = 0;
 

include/wx/osx/nonownedwnd.h

@@ -65,6 +65,8 @@ public:
     virtual void UnsubclassWin();
 
     virtual wxPoint GetClientAreaOrigin() const;
+    
+    virtual double GetMagnificationFactor() const;
 
     // implement base class pure virtuals
 

include/wx/osx/window.h

@@ -97,6 +97,8 @@ public:
 
     virtual int GetCharHeight() const;
     virtual int GetCharWidth() const;
+    
+    virtual double GetMagnificationFactor() const;
 
 public:
     virtual void SetScrollbar( int orient, int pos, int thumbVisible,

include/wx/window.h

@@ -521,6 +521,11 @@ public:
         return wxSize( wxMax( client.x, best.x ), wxMax( client.y, best.y ) );
     }
 
+    // returns the magnification of the backing store of this window
+    // eg 2.0 for a window on a retina screen
+    virtual double GetMagnificationFactor() const
+    { return 1.0; }
+    
     // return the size of the left/right and top/bottom borders in x and y
     // components of the result respectively
     virtual wxSize GetWindowBorderSize() const;