adding impls to wxBitmap on msw as this doesn't inherit from base - Thanks Vaclav!

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74298 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/bitmap.h

@@ -144,6 +144,9 @@ public:
 
     virtual bool Create(int width, int height, const wxDC& dc);
     virtual bool Create(const void* data, wxBitmapType type, int width, int height, int depth = 1);
+    virtual bool CreateScaled(int w, int h, int d, double logicalScale)
+        { return Create(w*logicalScale,h*logicalScale,d); }
+
     virtual bool LoadFile(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);
     virtual bool SaveFile(const wxString& name, wxBitmapType type, const wxPalette *cmap = NULL) const;
 
@@ -167,6 +170,13 @@ public:
     bool HasAlpha() const;
     void UseAlpha();
 
+    // support for scaled bitmaps
+    virtual double GetScaleFactor() const { return 1.0; }
+    virtual double GetScaledWidth() const { return GetWidth() / GetScaleFactor(); }
+    virtual double GetScaledHeight() const { return GetHeight() / GetScaleFactor(); }
+    virtual wxSize GetScaledSize() const
+    { return wxSize(GetScaledWidth(), GetScaledHeight()); }
+
     // implementation only from now on
     // -------------------------------