Add support for using Direct2D in wxStyledTextCtrl

Use D2D if available, notably for better ligatures support.

See https://github.com/wxWidgets/wxWidgets/pull/689

Closes #17804.

include/wx/msw/private/graphicsd2d.h

@@ -0,0 +1,28 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/private/graphicsd2d.h
+// Purpose:     Allow functions from graphicsd2d.cpp to be used in othe files
+// Author:      New Pagodi
+// Created:     2017-10-31
+// Copyright:   (c) 2017 wxWidgets development team
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef WX_MSW_PRIVATE_GRAPHICSD2D_H_
+#define WX_MSW_PRIVATE_GRAPHICSD2D_H_
+
+#if wxUSE_GRAPHICS_DIRECT2D
+
+// Ensure no previous defines interfere with the Direct2D API headers
+#undef GetHwnd
+
+#include <d2d1.h>
+#include <dwrite.h>
+#include <wincodec.h>
+
+WXDLLIMPEXP_CORE IWICImagingFactory* wxWICImagingFactory();
+WXDLLIMPEXP_CORE ID2D1Factory* wxD2D1Factory();
+WXDLLIMPEXP_CORE IDWriteFactory* wxDWriteFactory();
+
+#endif // wxUSE_GRAPHICS_DIRECT2D
+
+#endif // WX_MSW_PRIVATE_GRAPHICSD2D_H_

include/wx/stc/stc.h

@@ -3963,6 +3963,12 @@ public:
     // to overlap from one line to the next.
     void SetPhasesDraw(int phases);
 
+    // Choose the quality level for text.
+    void SetFontQuality(int fontQuality);
+
+    // Retrieve the quality level for text.
+    int GetFontQuality() const;
+
     // Scroll so that a display line is at the top of the display.
     void SetFirstVisibleLine(int displayLine);