[[ libskia ]] Add accessor for FreeType face of SkTypeface

This patch adds the function SkTypeface_GetFTFace to allow access to the
underlying FT_Face font handle.

Author: livecodeian

libskia/include/ports/SkTypeface_FreeType.h

@@ -0,0 +1,15 @@
+#ifndef SkTypeface_FreeType_DEFINED
+#define SkTypeface_FreeType_DEFINED
+
+#include "SkTypeface.h"
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+/**
+ * Obtain access to the underlying FT_Face of a SkTypeface.
+ * The FT_Face should be released with FT_Done_Face once finished.
+ **/
+SK_API extern FT_Face SkTypeface_GetFTFace(const SkTypeface* face);
+
+#endif  // SkTypeface_FreeType_DEFINED

libskia/src/ports/SkFontHost_FreeType.cpp

@@ -418,6 +418,20 @@ class AutoFTAccess {
 
 ///////////////////////////////////////////////////////////////////////////
 
+extern FT_Face SkTypeface_GetFTFace(const SkTypeface* face);
+FT_Face SkTypeface_GetFTFace(const SkTypeface* face)
+{
+	FT_Face t_face;
+	gFTMutex.acquire();
+	t_face = ref_ft_face(face);
+	FT_Reference_Face(t_face);
+	unref_ft_face(t_face);
+	gFTMutex.release();
+	return t_face;
+}
+
+///////////////////////////////////////////////////////////////////////////
+
 static bool canEmbed(FT_Face face) {
     FT_UShort fsType = FT_Get_FSType_Flags(face);
     return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |