Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-private.hh

 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
@@ skipping 593 matching lines @@
 
 /* Makes class uncopyable.  Use in private: section. */
 #define NO_COPY(T) \
   T (const T &o); \
   T &operator = (const T &o)
 
 
 /* Debug */
 
 
+/* HB_NDEBUG disables some sanity checks that are very safe to disable and
+ * should be disabled in production systems.  If NDEBUG is defined, enable
+ * HB_NDEBUG; but if it's desirable that normal assert()s (which are very
+ * light-weight) to be enabled, then HB_DEBUG can be defined to disable
+ * the costlier checks. */
+#ifdef NDEBUG
+#define HB_NDEBUG
+#endif
+
 #ifndef HB_DEBUG
 #define HB_DEBUG 0
 #endif
 
 static inline bool
 _hb_debug (unsigned int level,
            unsigned int max_level)
 {
   return level < max_level;
 }
@@ skipping 378 matching lines @@
   if (unlikely (!_hb_options.i))
     _hb_options_init ();
 
   return _hb_options.opts;
 }
 
 /* Size signifying variable-sized array */
 #define VAR 1
 
 #endif /* HB_PRIVATE_HH */