Add hb-ot-font.cc and hb-ot-font.h

third_party/harfbuzz-ng/src/hb-ot-font.cc

 /*
  * Copyright © 2011,2014  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 201 matching lines @@
   return font->em_scale_x (ot_font->h_metrics.get_advance (glyph));
 }
 
 static hb_position_t
 hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
                            void *font_data,
                            hb_codepoint_t glyph,
                            void *user_data HB_UNUSED)
 {
   const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
-  return font->em_scale_y (-ot_font->v_metrics.get_advance (glyph));
+  return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph));
 }
 
 static hb_bool_t
 hb_ot_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
                           void *font_data HB_UNUSED,
                           hb_codepoint_t glyph HB_UNUSED,
                           hb_position_t *x HB_UNUSED,
                           hb_position_t *y HB_UNUSED,
                           void *user_data HB_UNUSED)
 {
@@ skipping 106 matching lines @@
 {
   hb_ot_font_t *ot_font = _hb_ot_font_create (font);
   if (unlikely (!ot_font))
     return;
 
   hb_font_set_funcs (font,
                      _hb_ot_get_font_funcs (),
                      ot_font,
                      (hb_destroy_func_t) _hb_ot_font_destroy);
 }