Rename HB_OT_INDIC_OPTIONS env var to HB_OPTIONS

The Myanmar shaper now respects the uniscribe-bug-compatibility
option too.

src/hb-common.cc

@@ -36,6 +36,24 @@
 #include <locale.h>
 
 
+/* hb_options_t */
+
+hb_options_union_t _hb_options;
+
+void
+_hb_options_init (void)
+{
+  hb_options_union_t u;
+  u.i = 0;
+  u.opts.initialized = 1;
+
+  char *c = getenv ("HB_OPTIONS");
+  u.opts.uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible");
+
+  /* This is idempotent and threadsafe. */
+  _hb_options = u;
+}
+
 
 /* hb_tag_t */
 
@@ -414,5 +432,3 @@ hb_version_check (unsigned int major,
 {
   return HB_VERSION_CHECK (major, minor, micro);
 }
-
-

src/hb-ot-shape-complex-indic.cc

@@ -267,49 +267,6 @@ set_indic_properties (hb_glyph_info_t &info)
  */
 
 
-/*
- * Global Indic shaper options.
- */
-
-struct indic_options_t
-{
-  int initialized : 1;
-  int uniscribe_bug_compatible : 1;
-};
-
-union indic_options_union_t {
-  int i;
-  indic_options_t opts;
-};
-ASSERT_STATIC (sizeof (int) == sizeof (indic_options_union_t));
-
-static indic_options_union_t
-indic_options_init (void)
-{
-  indic_options_union_t u;
-  u.i = 0;
-  u.opts.initialized = 1;
-
-  char *c = getenv ("HB_OT_INDIC_OPTIONS");
-  u.opts.uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible");
-
-  return u;
-}
-
-static inline indic_options_t
-indic_options (void)
-{
-  static indic_options_union_t options;
-
-  if (unlikely (!options.i)) {
-    /* This is idempotent and threadsafe. */
-    options = indic_options_init ();
-  }
-
-  return options.opts;
-}
-
-
 /*
  * Indic configurations.  Note that we do not want to keep every single script-specific
  * behavior in these tables necessarily.  This should mainly be used for per-script
@@ -484,7 +441,7 @@ static void
 override_features_indic (hb_ot_shape_planner_t *plan)
 {
   /* Uniscribe does not apply 'kern'. */
-  if (indic_options ().uniscribe_bug_compatible)
+  if (hb_options ().uniscribe_bug_compatible)
     plan->map.add_feature (HB_TAG('k','e','r','n'), 0, true);
 
   plan->map.add_feature (HB_TAG('l','i','g','a'), 0, true);
@@ -1044,7 +1001,7 @@ initial_reordering_standalone_cluster (const hb_ot_shape_plan_t *plan,
   /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain.
    * Only if not in compatibility mode that is... */
 
-  if (indic_options ().uniscribe_bug_compatible)
+  if (hb_options ().uniscribe_bug_compatible)
   {
     /* For dotted-circle, this is what Uniscribe does:
      * If dotted-circle is the last glyph, it just does nothing.
@@ -1380,7 +1337,7 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan,
        * Uniscribe doesn't do this.
        * TEST: U+0930,U+094D,U+0915,U+094B,U+094D
        */
-      if (!indic_options ().uniscribe_bug_compatible &&
+      if (!hb_options ().uniscribe_bug_compatible &&
 	  unlikely (is_halant_or_coeng (info[new_reph_pos]))) {
 	for (unsigned int i = base + 1; i < new_reph_pos; i++)
 	  if (info[i].indic_category() == OT_M) {
@@ -1484,7 +1441,7 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan,
   /*
    * Finish off the clusters and go home!
    */
-  if (indic_options ().uniscribe_bug_compatible)
+  if (hb_options ().uniscribe_bug_compatible)
   {
     /* Uniscribe merges the entire cluster.
      * This means, half forms are submerged into the main consonants cluster.
@@ -1600,7 +1557,7 @@ decompose_indic (const hb_ot_shape_normalize_context_t *c,
 
     hb_codepoint_t glyph;
 
-    if (indic_options ().uniscribe_bug_compatible ||
+    if (hb_options ().uniscribe_bug_compatible ||
 	(c->font->get_glyph (ab, 0, &glyph) &&
 	 indic_plan->pstf.would_substitute (&glyph, 1, true, c->font->face)))
     {

src/hb-ot-shape-complex-myanmar.cc

@@ -128,12 +128,9 @@ override_features_myanmar (hb_ot_shape_planner_t *plan)
    * Windows 8 has lookups for it.  But testing suggests that
    * Windows 8 Uniscribe is NOT applying it.  It *is* applying
    * 'mkmk' however.
-   *
-   * We want to apply it, since that's the right thing to do.
    */
-#if 0
-  plan->map.add_feature (HB_TAG('m','a','r','k'), 0, true);
-#endif
+  if (hb_options ().uniscribe_bug_compatible)
+    plan->map.add_feature (HB_TAG('m','a','r','k'), 0, true);
 }
 
 

src/hb-private.hh

@@ -854,4 +854,33 @@ hb_codepoint_parse (const char *s, unsigned int len, int base, hb_codepoint_t *o
 }
 
 
+/* Global runtime options. */
+
+struct hb_options_t
+{
+  int initialized : 1;
+  int uniscribe_bug_compatible : 1;
+};
+
+union hb_options_union_t {
+  int i;
+  hb_options_t opts;
+};
+ASSERT_STATIC (sizeof (int) == sizeof (hb_options_union_t));
+
+HB_INTERNAL void
+_hb_options_init (void);
+
+extern HB_INTERNAL hb_options_union_t _hb_options;
+
+static inline hb_options_t
+hb_options (void)
+{
+  if (unlikely (!_hb_options.i))
+    _hb_options_init ();
+
+  return _hb_options.opts;
+}
+
+
 #endif /* HB_PRIVATE_HH */