Add ToDIP to wxDC and wxGraphicsContext

include/wx/dc.h

@@ -541,6 +541,8 @@ public:
 
     virtual wxSize FromDIP(const wxSize& sz) const;
 
+    virtual wxSize ToDIP(const wxSize& sz) const;
+
 #ifdef __WXMSW__
     // Native Windows functions using the underlying HDC don't honour GDI+
     // transformations which may be applied to it. Using this function we can
@@ -839,6 +841,20 @@ public:
     int FromDIP(int d) const
         { return FromDIP(wxSize(d, 0)).x; }
 
+    wxSize ToDIP(const wxSize & sz) const
+    {
+        return m_pimpl->ToDIP(sz);
+    }
+    wxPoint ToDIP(const wxPoint & pt) const
+    {
+        const wxSize sz = ToDIP(wxSize(pt.x, pt.y));
+        return wxPoint(sz.x, sz.y);
+    }
+    int ToDIP(int d) const
+    {
+        return ToDIP(wxSize(d, 0)).x;
+    }
+
     // Right-To-Left (RTL) modes
 
     void SetLayoutDirection(wxLayoutDirection dir)

include/wx/dcsvg.h

@@ -253,6 +253,11 @@ private:
         return sz;
     }
 
+    virtual wxSize ToDIP(const wxSize& sz) const wxOVERRIDE
+    {
+        return sz;
+    }
+
     void Init(const wxString& filename, int width, int height,
               double dpi, const wxString& title);
 

include/wx/generic/dcpsg.h

@@ -81,6 +81,11 @@ public:
         return sz;
     }
 
+    virtual wxSize ToDIP(const wxSize& sz) const wxOVERRIDE
+    {
+        return sz;
+    }
+
     virtual void ComputeScaleAndOrigin() wxOVERRIDE;
 
     void SetBackgroundMode(int WXUNUSED(mode)) wxOVERRIDE { }

include/wx/graphics.h

@@ -750,6 +750,17 @@ public:
         return FromDIP(wxSize(d, 0)).x;
     }
 
+    wxSize ToDIP(const wxSize& sz) const;
+    wxPoint ToDIP(const wxPoint& pt) const
+    {
+        const wxSize sz = ToDIP(wxSize(pt.x, pt.y));
+        return wxPoint(sz.x, sz.y);
+    }
+    int ToDIP(int d) const
+    {
+        return ToDIP(wxSize(d, 0)).x;
+    }
+
 #if 0
     // sets the current alpha on this context
     virtual void SetAlpha( wxDouble alpha );

include/wx/msw/dcprint.h

@@ -41,6 +41,11 @@ public:
         return sz;
     }
 
+    virtual wxSize ToDIP(const wxSize& sz) const wxOVERRIDE
+    {
+        return sz;
+    }
+
     void SetFont(const wxFont& font) wxOVERRIDE;
 
 protected:

src/common/dcbase.cpp

@@ -617,6 +617,17 @@ wxSize wxDCImpl::FromDIP(const wxSize& sz) const
 #endif // wxHAS_DPI_INDEPENDENT_PIXELS
 }
 
+wxSize wxDCImpl::ToDIP(const wxSize& sz) const
+{
+#ifdef wxHAS_DPI_INDEPENDENT_PIXELS
+    return sz;
+#else
+    const wxSize dpi = GetPPI();
+    const wxSize baseline = wxDisplay::GetStdPPI();
+    return wxRescaleCoord(sz).From(dpi).To(baseline);
+#endif // wxHAS_DPI_INDEPENDENT_PIXELS
+}
+
 bool wxDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 {
     wxTextMeasure tm(GetOwner(), &m_font);

src/common/graphcmn.cpp

@@ -647,6 +647,18 @@ wxSize wxGraphicsContext::FromDIP(const wxSize& sz) const
 #endif // wxHAS_DPI_INDEPENDENT_PIXELS
 }
 
+wxSize wxGraphicsContext::ToDIP(const wxSize& sz) const
+{
+#ifdef wxHAS_DPI_INDEPENDENT_PIXELS
+    return sz;
+#else
+    wxRealPoint dpi;
+    GetDPI(&dpi.x, &dpi.y);
+    const wxSize baseline = wxDisplay::GetStdPPI();
+    return wxRescaleCoord(sz).From(wxSize((int)dpi.x, (int)dpi.y)).To(baseline);
+#endif // wxHAS_DPI_INDEPENDENT_PIXELS
+}
+
 // sets the pen
 void wxGraphicsContext::SetPen( const wxGraphicsPen& pen )
 {

src/msw/enhmeta.cpp

@@ -229,6 +229,11 @@ public:
         return sz;
     }
 
+    virtual wxSize ToDIP(const wxSize& sz) const wxOVERRIDE
+    {
+        return sz;
+    }
+
     void SetFont(const wxFont& font) wxOVERRIDE
     {
         wxFont scaledFont = font;