[pango/hb-getters: 2/3] Add api to get a hb_font_t

[Matthias Clasen <matthiasc src gnome org>]

commit c58abf52ca5d5ec91a0a33128610cf5787692f17
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 15 16:34:01 2018 -0400

    Add api to get a hb_font_t
    
    This will make it easier to access harfbuzz features.

 pango/fonts.c      | 23 +++++++++++++++++++++++
 pango/pango-font.h |  6 +++++-
 2 files changed, 28 insertions(+), 1 deletion(-)
---
diff --git a/pango/fonts.c b/pango/fonts.c
index d9a07c0b..28614b2f 100644
--- a/pango/fonts.c
+++ b/pango/fonts.c
@@ -1837,6 +1837,29 @@ pango_font_get_font_map (PangoFont *font)
     return NULL;
 }
 
+/**
+ * pango_font_get_hb_font:
+ * @font: a #PangoFont
+ *
+ * Get a hb_font_t object backing this font.
+ *
+ * Returns: (transfer full) (nullable): the hb_font_t object backing the
+ *          font, or %NULL if the font does not have one
+ *
+ * Since: 1.44
+ */
+hb_font_t *
+pango_font_get_hb_font (PangoFont *font)
+{
+  if (G_UNLIKELY (!font))
+    return NULL;
+
+  if (PANGO_FONT_GET_CLASS (font)->get_hb_font)
+    return PANGO_FONT_GET_CLASS (font)->get_hb_font (font);
+  else
+    return NULL;
+}
+
 G_DEFINE_BOXED_TYPE (PangoFontMetrics, pango_font_metrics,
                      pango_font_metrics_ref,
                      pango_font_metrics_unref);
diff --git a/pango/pango-font.h b/pango/pango-font.h
index 4af31a95..d9a35885 100644
--- a/pango/pango-font.h
+++ b/pango/pango-font.h
@@ -26,6 +26,7 @@
 #include <pango/pango-types.h>
 
 #include <glib-object.h>
+#include <hb.h>
 
 G_BEGIN_DECLS
 
@@ -583,6 +584,9 @@ void                  pango_font_get_glyph_extents (PangoFont        *font,
 PANGO_AVAILABLE_IN_1_10
 PangoFontMap         *pango_font_get_font_map      (PangoFont        *font);
 
+PANGO_AVAILABLE_IN_1_44
+hb_font_t *           pango_font_get_hb_font       (PangoFont        *font);
+
 #ifdef PANGO_ENABLE_BACKEND
 
 #define PANGO_FONT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FONT, PangoFontClass))
@@ -632,11 +636,11 @@ struct _PangoFontClass
                                               PangoLanguage  *language);
   PangoFontMap *        (*get_font_map)       (PangoFont      *font);
   PangoFontDescription *(*describe_absolute)  (PangoFont      *font);
+  hb_font_t *           (*get_hb_font)        (PangoFont      *font);
   /*< private >*/
 
   /* Padding for future expansion */
   void (*_pango_reserved1) (void);
-  void (*_pango_reserved2) (void);
 };
 
 /* used for very rare and miserable situtations that we cannot even