[hmtx] Specialize var_table

src/hb-ot-font.cc

@@ -151,7 +151,7 @@ hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
   const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
 
 #ifndef HB_NO_VAR
-  const OT::HVARVVAR &HVAR = *hmtx.var_table;
+  const OT::HVAR &HVAR = *hmtx.var_table;
   const OT::VariationStore &varStore = &HVAR + HVAR.varStore;
   OT::VariationStore::cache_t *varStore_cache = font->num_coords * count >= 128 ? varStore.create_cache () : nullptr;
 
@@ -242,7 +242,7 @@ hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
   if (vmtx.has_data ())
   {
 #ifndef HB_NO_VAR
-    const OT::HVARVVAR &VVAR = *vmtx.var_table;
+    const OT::VVAR &VVAR = *vmtx.var_table;
     const OT::VariationStore &varStore = &VVAR + VVAR.varStore;
     OT::VariationStore::cache_t *varStore_cache = font->num_coords ? varStore.create_cache () : nullptr;
 #else

src/hb-ot-hmtx-table.hh

@@ -62,7 +62,7 @@ struct LongMetric
 };
 
 
-template <typename T, typename H>
+template <typename T/*Data table type*/, typename H/*Header table type*/, typename V/*Var table type*/>
 struct hmtxvmtx
 {
   bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const
@@ -173,7 +173,7 @@ struct hmtxvmtx
     accelerator_t (hb_face_t *face)
     {
       table = hb_sanitize_context_t ().reference_table<hmtxvmtx> (face, T::tableTag);
-      var_table = hb_sanitize_context_t ().reference_table<HVARVVAR> (face, T::variationsTag);
+      var_table = hb_sanitize_context_t ().reference_table<V> (face, T::variationsTag);
 
       default_advance = T::is_horizontal ? hb_face_get_upem (face) / 2 : hb_face_get_upem (face);
 
@@ -313,7 +313,7 @@ struct hmtxvmtx
 
     public:
     hb_blob_ptr_t<hmtxvmtx> table;
-    hb_blob_ptr_t<HVARVVAR> var_table;
+    hb_blob_ptr_t<V> var_table;
   };
 
   protected:
@@ -346,12 +346,12 @@ struct hmtxvmtx
   DEFINE_SIZE_ARRAY (0, longMetricZ);
 };
 
-struct hmtx : hmtxvmtx<hmtx, hhea> {
+struct hmtx : hmtxvmtx<hmtx, hhea, HVAR> {
   static constexpr hb_tag_t tableTag = HB_OT_TAG_hmtx;
   static constexpr hb_tag_t variationsTag = HB_OT_TAG_HVAR;
   static constexpr bool is_horizontal = true;
 };
-struct vmtx : hmtxvmtx<vmtx, vhea> {
+struct vmtx : hmtxvmtx<vmtx, vhea, VVAR> {
   static constexpr hb_tag_t tableTag = HB_OT_TAG_vmtx;
   static constexpr hb_tag_t variationsTag = HB_OT_TAG_VVAR;
   static constexpr bool is_horizontal = false;