Forward port of my recent changes in the 2.8 branch:

* Force use of floating point math in wxGCDC::DoDrawEllipticArc.

 * Check for 0.5 offset in wxGCDC::DoDrawRoundedRectangle and
   DoDrawEllipse.  Set wxGDIPlusContext to use the offset.

 * Avoid crash in wxStdDialogButtonSizer::Realize if there is no
   negative button.

 * Provide implementations for wxCairoPathData::AddPath,
   wxCairoContext::Clip, wxCairoContext::DrawBitmap,
   wxCairoContext::DrawIcon, and wxCairoContext::GetTextExtent.

 * Fix wxCairoContext::DrawText to draw the text using the upper-left
   corner for the x,y position, not the baseline.

 * Fix wxMacCoreGraphicsRenderer::CreateContext to be able to use a
   wxMemoryDC as the target.

 * Map wxTELETYPE font family on wxMac to a monospace font.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45077 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/graphics.cpp

@@ -303,6 +303,7 @@ public:
     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
         wxDouble *descent, wxDouble *externalLeading ) const;
     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
+    virtual bool ShouldOffset() const;
 
 private:
     void    Init();
@@ -1185,6 +1186,18 @@ void wxGDIPlusContext::GetPartialTextExtents(const wxString& text, wxArrayDouble
     }
 }
 
+bool wxGDIPlusContext::ShouldOffset() const
+{     
+    int penwidth = 0 ;
+    if ( !m_pen.IsNull() )
+    {
+        penwidth = (int)((wxGDIPlusPenData*)m_pen.GetRefData())->GetWidth();
+        if ( penwidth == 0 )
+            penwidth = 1;
+    }
+    return ( penwidth % 2 ) == 1;
+}
+
 void* wxGDIPlusContext::GetNativeContext()
 {
     return m_context;