Roll HarfBuzz to 1.1.3

third_party/harfbuzz-ng/src/hb-ot-layout-gsubgpos-private.hh

 /*
  * Copyright © 2007,2008,2009,2010  Red Hat, Inc.
  * Copyright © 2010,2012  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 827 matching lines @@
       _hb_glyph_info_set_general_category (&buffer->cur(), HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER);
     }
   }
   c->replace_glyph_with_ligature (lig_glyph, klass);
 
   for (unsigned int i = 1; i < count; i++)
   {
     while (buffer->idx < match_positions[i] && !buffer->in_error)
     {
       if (!is_mark_ligature) {
+        unsigned int this_comp = _hb_glyph_info_get_lig_comp (&buffer->cur());
+        if (this_comp == 0)
+          this_comp = last_num_components;
         unsigned int new_lig_comp = components_so_far - last_num_components +
-                                    MIN (MAX (_hb_glyph_info_get_lig_comp (&buffer->cur()), 1u), last_num_components);
-        _hb_glyph_info_set_lig_props_for_mark (&buffer->cur(), lig_id, new_lig_comp);
+                                    MIN (this_comp, last_num_components);
+          _hb_glyph_info_set_lig_props_for_mark (&buffer->cur(), lig_id, new_lig_comp);
       }
       buffer->next_glyph ();
     }
 
     last_lig_id = _hb_glyph_info_get_lig_id (&buffer->cur());
     last_num_components = _hb_glyph_info_get_lig_num_comps (&buffer->cur());
     components_so_far += last_num_components;
 
     /* Skip the base glyph */
     buffer->idx++;
   }
 
   if (!is_mark_ligature && last_lig_id) {
     /* Re-adjust components for any marks following. */
     for (unsigned int i = buffer->idx; i < buffer->len; i++) {
       if (last_lig_id == _hb_glyph_info_get_lig_id (&buffer->info[i])) {
+        unsigned int this_comp = _hb_glyph_info_get_lig_comp (&buffer->info[i]);
+        if (!this_comp)
+          break;
         unsigned int new_lig_comp = components_so_far - last_num_components +
-                                    MIN (MAX (_hb_glyph_info_get_lig_comp (&buffer->info[i]), 1u), last_num_components);
+                                    MIN (this_comp, last_num_components);
         _hb_glyph_info_set_lig_props_for_mark (&buffer->info[i], lig_id, new_lig_comp);
       } else
         break;
     }
   }
   return_trace (true);
 }
 
 static inline bool match_backtrack (hb_apply_context_t *c,
                                     unsigned int count,
@@ skipping 1402 matching lines @@
                 lookupList;     /* LookupList table */
   public:
   DEFINE_SIZE_STATIC (10);
 };
 
 
 } /* namespace OT */
 
 
 #endif /* HB_OT_LAYOUT_GSUBGPOS_PRIVATE_HH */