[cmap] Push get_nominal_glyphs down into cmap accelerator

src/hb-ot-cmap-table.hh

@@ -1060,6 +1060,27 @@ struct cmap
       if (unlikely (!this->get_glyph_funcZ)) return false;
       return this->get_glyph_funcZ (this->get_glyph_data, unicode, glyph);
     }
+    inline unsigned int get_nominal_glyphs (unsigned int count,
+					    const hb_codepoint_t *first_unicode,
+					    unsigned int unicode_stride,
+					    hb_codepoint_t *first_glyph,
+					    unsigned int glyph_stride) const
+    {
+      if (unlikely (!this->get_glyph_funcZ)) return 0;
+
+      hb_cmap_get_glyph_func_t get_glyph_funcZ = this->get_glyph_funcZ;
+      const void *get_glyph_data = this->get_glyph_data;
+
+      unsigned int done;
+      for (done = 0;
+	   done < count && get_glyph_funcZ (get_glyph_data, *first_unicode, first_glyph);
+	   done++)
+      {
+	first_unicode = &StructAtOffset<hb_codepoint_t> (first_unicode, unicode_stride);
+	first_glyph = &StructAtOffset<hb_codepoint_t> (first_glyph, glyph_stride);
+      }
+      return done;
+    }
 
     inline bool get_variation_glyph (hb_codepoint_t  unicode,
 				     hb_codepoint_t  variation_selector,

src/hb-ot-font.cc

@@ -76,16 +76,9 @@ hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
 			  void *user_data HB_UNUSED)
 {
   const hb_ot_face_data_t *ot_face = (const hb_ot_face_data_t *) font_data;
-  const OT::cmap_accelerator_t &cmap = *ot_face->cmap;
-  unsigned int done;
-  for (done = 0;
-       done < count && cmap.get_nominal_glyph (*first_unicode, first_glyph);
-       done++)
-  {
-    first_unicode = &StructAtOffset<hb_codepoint_t> (first_unicode, unicode_stride);
-    first_glyph = &StructAtOffset<hb_codepoint_t> (first_glyph, glyph_stride);
-  }
-  return done;
+  return ot_face->cmap->get_nominal_glyphs (count,
+					    first_unicode, unicode_stride,
+					    first_glyph, glyph_stride);
 }
 
 static hb_bool_t