harfbuzz-ng roll

third_party/harfbuzz-ng/src/hb-common.cc

 /*
  * Copyright © 2009,2010  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 40 matching lines @@
   if (len < 0 || len > 4)
     len = 4;
   for (i = 0; i < (unsigned) len && s[i]; i++)
     tag[i] = s[i];
   for (; i < 4; i++)
     tag[i] = ' ';
 
   return HB_TAG_CHAR4 (tag);
 }
 
+void
+hb_tag_to_string (hb_tag_t tag, char *buf)
+{
+  buf[0] = (char) (uint8_t) (tag >> 24);
+  buf[1] = (char) (uint8_t) (tag >> 16);
+  buf[2] = (char) (uint8_t) (tag >>  8);
+  buf[3] = (char) (uint8_t) (tag >>  0);
+}
+
 
 /* hb_direction_t */
 
 const char direction_strings[][4] = {
   "ltr",
   "rtl",
   "ttb",
   "btt"
 };
 
@@ skipping 20 matching lines @@
   if (likely ((unsigned int) (direction - HB_DIRECTION_LTR)
               < ARRAY_LENGTH (direction_strings)))
     return direction_strings[direction - HB_DIRECTION_LTR];
 
   return "invalid";
 }
 
 
 /* hb_language_t */
 
-struct _hb_language_t {
+struct hb_language_impl_t {
   const char s[1];
 };
 
 static const char canon_map[256] = {
    0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,
    0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,   0,   0,   0,
    0,   0,   0,   0,   0,   0,   0,   0,    0,   0,   0,   0,   0,  '-',  0,   0,
   '0', '1', '2', '3', '4', '5', '6', '7',  '8', '9',  0,   0,   0,   0,   0,   0,
   '-', 'a', 'b', 'c', 'd', 'e', 'f', 'g',  'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
   'p', 'q', 'r', 's', 't', 'u', 'v', 'w',  'x', 'y', 'z',  0,   0,   0,   0,  '-',
@@ skipping 119 matching lines @@
 const char *
 hb_language_to_string (hb_language_t language)
 {
   /* This is actually NULL-safe! */
   return language->s;
 }
 
 hb_language_t
 hb_language_get_default (void)
 {
-  static hb_language_t default_language;
+  static hb_language_t default_language = HB_LANGUAGE_INVALID;
 
-  if (!default_language) {
-    /* This block is not quite threadsafe, but is not as bad as
-     * it looks since it's idempotent.  As long as pointer ops
-     * are atomic, we are safe. */
-
-    /* I hear that setlocale() doesn't honor env vars on Windows,
-     * but for now we ignore that. */
-
-    default_language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1);
+  hb_language_t language = (hb_language_t) hb_atomic_ptr_get (&default_language);
+  if (unlikely (language == HB_LANGUAGE_INVALID)) {
+    language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1);
+    hb_atomic_ptr_cmpexch (&default_language, HB_LANGUAGE_INVALID, language);
   }
 
   return default_language;
 }
 
 
 /* hb_script_t */
 
 hb_script_t
 hb_script_from_iso15924_tag (hb_tag_t tag)
@@ skipping 151 matching lines @@
 
 hb_bool_t
 hb_version_check (unsigned int major,
                   unsigned int minor,
                   unsigned int micro)
 {
   return HB_VERSION_CHECK (major, minor, micro);
 }