[otlayout] Switch over from old is_a_ligature() to IS_LIGATED

Impact should be minimal and positive.

src/hb-ot-layout-gsubgpos-private.hh

@@ -409,7 +409,7 @@ struct hb_apply_context_t
       if (unlikely (_hb_glyph_info_is_default_ignorable (&info) &&
 		    (ignore_zwnj || !_hb_glyph_info_is_zwnj (&info)) &&
 		    (ignore_zwj || !_hb_glyph_info_is_zwj (&info)) &&
-		    !_hb_glyph_info_is_ligated (&info)))
+		    !_hb_glyph_info_ligated (&info)))
 	return SKIP_MAYBE;
 
       return SKIP_NO;

src/hb-ot-layout-private.hh

@@ -306,7 +306,7 @@ _hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
 }
 
 static inline bool
-_hb_glyph_info_is_ligated (const hb_glyph_info_t *info)
+_hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
 {
   return !!(info->lig_props() & IS_LIG_BASE);
 }
@@ -314,7 +314,7 @@ _hb_glyph_info_is_ligated (const hb_glyph_info_t *info)
 static inline unsigned int
 _hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
 {
-  if (_hb_glyph_info_is_ligated (info))
+  if (_hb_glyph_info_ligated_internal (info))
     return 0;
   else
     return info->lig_props() & 0x0F;
@@ -324,7 +324,7 @@ static inline unsigned int
 _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
 {
   if ((info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) &&
-      _hb_glyph_info_is_ligated (info))
+      _hb_glyph_info_ligated_internal (info))
     return info->lig_props() & 0x0F;
   else
     return 1;
@@ -370,6 +370,12 @@ _hb_glyph_info_is_mark (const hb_glyph_info_t *info)
   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK);
 }
 
+static inline bool
+_hb_glyph_info_ligated (const hb_glyph_info_t *info)
+{
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED);
+}
+
 /* Allocation / deallocation. */
 
 inline void

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

@@ -141,7 +141,7 @@ static inline bool
 is_one_of (const hb_glyph_info_t &info, unsigned int flags)
 {
   /* If it ligated, all bets are off. */
-  if (_hb_glyph_info_is_ligated (&info)) return false;
+  if (_hb_glyph_info_ligated (&info)) return false;
   return !!(FLAG (info.indic_category()) & flags);
 }
 
@@ -1406,7 +1406,7 @@ final_reordering_syllable (const hb_ot_shape_plan_t *plan,
   if (start + 1 < end &&
       info[start].indic_position() == POS_RA_TO_BECOME_REPH &&
       ((info[start].indic_category() == OT_Repha) ^
-       _hb_glyph_info_is_ligated (&info[start])))
+       _hb_glyph_info_ligated (&info[start])))
   {
     unsigned int new_reph_pos;
     reph_position_t reph_pos = indic_plan->config->reph_pos;

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

@@ -151,7 +151,7 @@ static inline bool
 is_one_of (const hb_glyph_info_t &info, unsigned int flags)
 {
   /* If it ligated, all bets are off. */
-  if (_hb_glyph_info_is_ligated (&info)) return false;
+  if (_hb_glyph_info_ligated (&info)) return false;
   return !!(FLAG (info.myanmar_category()) & flags);
 }
 

src/hb-ot-shape.cc

@@ -548,7 +548,7 @@ hb_ot_hide_default_ignorables (hb_ot_shape_context_t *c)
   unsigned int j = 0;
   for (unsigned int i = 0; i < count; i++)
   {
-    if (unlikely (!_hb_glyph_info_is_ligated (&info[i]) &&
+    if (unlikely (!_hb_glyph_info_ligated (&info[i]) &&
 		  _hb_glyph_info_is_default_ignorable (&info[i])))
     {
       if (space_status == SPACE_DONT_KNOW)