[pango/pango1-dwrite: 6/8] PangoCairo: Create cairo_font_face_t using DirectWrite

[Chun-wei Fan <fanchunwei src gnome org>]

commit cdf6d576147de11f26df285f875c3a531ba44223
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Aug 15 17:35:09 2022 +0800

    PangoCairo: Create cairo_font_face_t using DirectWrite
    
    ...if Cairo is built with DirectWrite support.  With this, we can
    support colored Emoji, a long-standing issue, on Windows without needing
    to use FontConfig, on Windows 8.1 or later, since DirectWrite added support
    for colored Emoji starting with Windows 8.1.
    
    This will really fix issue !302 completely, regarding the Emoji not
    shown in color!

 pango/pangocairo-win32font.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/pango/pangocairo-win32font.c b/pango/pangocairo-win32font.c
index 5b860bab8..523ac62e7 100644
--- a/pango/pangocairo-win32font.c
+++ b/pango/pangocairo-win32font.c
@@ -75,6 +75,14 @@ pango_cairo_win32_font_create_font_face (PangoCairoFont *font)
 {
   PangoCairoWin32Font *cwfont = PANGO_CAIRO_WIN32_FONT (font);
   PangoWin32Font *win32font =  &cwfont->font;
+  void *dwrite_font_face = NULL;
+  gpointer dwrite_font = NULL;
+
+#ifdef HAVE_CAIRO_WIN32_DIRECTWRITE
+  dwrite_font_face = pango_win32_font_get_dwrite_font_face (win32font);
+  if (dwrite_font_face != NULL)
+    return cairo_dwrite_font_face_create_for_dwrite_fontface (dwrite_font_face);
+#endif
 
   return cairo_win32_font_face_create_for_logfontw (&win32font->logfontw);
 }