Document wxEnhMetaFileDC-related wxGraphics functions.

Closes #13325.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68235 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/graphics.h

@@ -342,6 +342,16 @@ public:
     */
     static wxGraphicsContext* Create(const wxPrinterDC& dc);
 
+    /**
+        Creates a wxGraphicsContext from a wxEnhMetaFileDC.
+
+        This function, as wxEnhMetaFileDC class itself, is only available only
+        under MSW.
+
+        @see wxGraphicsRenderer::CreateContext()
+    */
+    static wxGraphicsContext* Create(const wxEnhMetaFileDC& dc);
+
     /**
         Clips drawings to the specified region.
     */
@@ -862,6 +872,14 @@ public:
     */
     virtual wxGraphicsContext* CreateContext(const wxPrinterDC& dc) = 0 ;
 
+    /**
+        Creates a wxGraphicsContext from a wxEnhMetaFileDC.
+
+        This function, as wxEnhMetaFileDC class itself, is only available only
+        under MSW.
+    */
+    virtual wxGraphicsContext* CreateContext(const wxEnhMetaFileDC& dc) = 0;
+
     /**
         Creates a native brush from a wxBrush.
     */