Roll harfbuzz-ng to 0.9.40

third_party/harfbuzz-ng/src/hb-ot-shape-fallback.cc

 /*
  * 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
  * all copies of this software.
@@ skipping 423 matching lines @@
 void
 _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
                             hb_font_t *font,
                             hb_buffer_t  *buffer)
 {
   if (!plan->has_kern) return;
 
   OT::hb_apply_context_t c (1, font, buffer);
   c.set_lookup_mask (plan->kern_mask);
   c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
+  OT::hb_apply_context_t::skipping_iterator_t &skippy_iter = c.iter_input;
+  skippy_iter.init (&c);
 
   unsigned int count = buffer->len;
   hb_glyph_info_t *info = buffer->info;
   hb_glyph_position_t *pos = buffer->pos;
   for (unsigned int idx = 0; idx < count;)
   {
-    OT::hb_apply_context_t::skipping_forward_iterator_t skippy_iter (&c, idx, 1);
+    skippy_iter.reset (idx, 1);
     if (!skippy_iter.next ())
     {
       idx++;
       continue;
     }
 
     hb_position_t x_kern, y_kern;
     font->get_glyph_kerning_for_direction (info[idx].codepoint,
                                            info[skippy_iter.idx].codepoint,
                                            buffer->props.direction,
@@ skipping 13 matching lines @@
       hb_position_t kern1 = y_kern >> 1;
       hb_position_t kern2 = y_kern - kern1;
       pos[idx].y_advance += kern1;
       pos[skippy_iter.idx].y_advance += kern2;
       pos[skippy_iter.idx].y_offset += kern2;
     }
 
     idx = skippy_iter.idx;
   }
 }