Add support for expanded stretch in head table

[jesusdesantos]

We fully replaced FreeType with HarfBuzz and in parts of our code we are directly reading TTF tables. The 'head' table has all member protected and we can't access the macStyle flags. We added the following changes, not sure if you want to apply them.

`
Index: hb-ot-head-table.hh
===================================================================
--- hb-ot-head-table.hh	(revision 10825)
+++ hb-ot-head-table.hh	(working copy)
@@ -72,12 +72,14 @@
     UNDERLINE	= 1u<<2,
     OUTLINE	= 1u<<3,
     SHADOW	= 1u<<4,
-    CONDENSED	= 1u<<5
+    CONDENSED	= 1u<<5,
+    EXPANDED	= 1u<<6
   };
 
   bool is_bold () const      { return macStyle & BOLD; }
   bool is_italic () const    { return macStyle & ITALIC; }
   bool is_condensed () const { return macStyle & CONDENSED; }
+  bool is_expanded () const { return macStyle & EXPANDED; }
 
   bool sanitize (hb_sanitize_context_t *c) const
   {

`

[behdad]

Thanks. Does the public API (hb-style in this case) suffice for your app, or what is missing?

[jesusdesantos]

Not really, we need the low-level bits. We are a WPF implementation for videogames and need to strictly follow what Microsoft does regarding name tables and font styles.

Thanks!