Added wxDC::CreateGraphicsContext and implemented it for a few DCs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53344 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dc.h

@@ -42,6 +42,11 @@ class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
 class WXDLLIMPEXP_FWD_CORE wxPrintData;
 
+
+#if wxUSE_GRAPHICS_CONTEXT
+class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
+#endif
+
 //-----------------------------------------------------------------------------
 // wxDrawObject helper class
 //-----------------------------------------------------------------------------
@@ -182,6 +187,15 @@ public:
     virtual bool CanDrawBitmap() const = 0;
     virtual bool CanGetTextExtent() const = 0;
 
+    // get graphics context from 
+
+#if wxUSE_GRAPHICS_CONTEXT
+    virtual wxGraphicsContext* CreateGraphicsContext()
+    {
+        return NULL;
+    }
+#endif
+
     // query dimension, colour deps, resolution
 
     virtual void DoGetSize(int *width, int *height) const = 0;
@@ -620,6 +634,11 @@ public:
     bool IsOk() const
         { return m_pimpl && m_pimpl->IsOk(); }
 
+#if wxUSE_GRAPHICS_CONTEXT
+    wxGraphicsContext* CreateGraphicsContext()
+        { return m_pimpl->CreateGraphicsContext(); }
+#endif
+
     // query capabilities
 
     bool CanDrawBitmap() const