[instancer] remap layout var_idxes code update

make hb_collect_variation_indices_context_t only collect layout
variation indices.

src/OT/Layout/GDEF/GDEF.hh

@@ -922,17 +922,32 @@ struct GDEF
   { get_lig_caret_list ().collect_variation_indices (c); }
 
   void remap_layout_variation_indices (const hb_set_t *layout_variation_indices,
+				       const hb_vector_t<int>& normalized_coords,
+				       bool calculate_delta, /* not pinned at default */
+				       bool no_variations, /* all axes pinned */
 				       hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *layout_variation_idx_delta_map /* OUT */) const
   {
     if (!has_var_store ()) return;
-    if (layout_variation_indices->is_empty ()) return;
-
+    const VariationStore &var_store = get_var_store ();
+    float *store_cache = var_store.create_cache ();
+    
     unsigned new_major = 0, new_minor = 0;
     unsigned last_major = (layout_variation_indices->get_min ()) >> 16;
     for (unsigned idx : layout_variation_indices->iter ())
     {
+      int delta = 0;
+      if (calculate_delta)
+        delta = roundf (var_store.get_delta (idx, normalized_coords.arrayZ,
+                                             normalized_coords.length, store_cache));
+
+      if (no_variations)
+      {
+        layout_variation_idx_delta_map->set (idx, hb_pair_t<unsigned, int> (HB_OT_LAYOUT_NO_VARIATIONS_INDEX, delta));
+        continue;
+      }
+
       uint16_t major = idx >> 16;
-      if (major >= get_var_store ().get_sub_table_count ()) break;
+      if (major >= var_store.get_sub_table_count ()) break;
       if (major != last_major)
       {
 	new_minor = 0;
@@ -940,14 +955,11 @@ struct GDEF
       }
 
       unsigned new_idx = (new_major << 16) + new_minor;
-      if (!layout_variation_idx_delta_map->has (idx))
-        continue;
-      int delta = hb_second (layout_variation_idx_delta_map->get (idx));
-
       layout_variation_idx_delta_map->set (idx, hb_pair_t<unsigned, int> (new_idx, delta));
       ++new_minor;
       last_major = major;
     }
+    var_store.destroy_cache (store_cache);
   }
 
   protected:

src/hb-ot-layout-common.hh

@@ -191,27 +191,15 @@ struct hb_collect_variation_indices_context_t :
   static return_t default_return_value () { return hb_empty_t (); }
 
   hb_set_t *layout_variation_indices;
-  hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *varidx_delta_map;
-  hb_vector_t<int> *normalized_coords;
-  const VariationStore *var_store;
   const hb_set_t *glyph_set;
   const hb_map_t *gpos_lookups;
-  float *store_cache;
 
   hb_collect_variation_indices_context_t (hb_set_t *layout_variation_indices_,
-					  hb_hashmap_t<unsigned, hb_pair_t<unsigned, int>> *varidx_delta_map_,
-					  hb_vector_t<int> *normalized_coords_,
-					  const VariationStore *var_store_,
 					  const hb_set_t *glyph_set_,
-					  const hb_map_t *gpos_lookups_,
-					  float *store_cache_) :
+					  const hb_map_t *gpos_lookups_) :
 					layout_variation_indices (layout_variation_indices_),
-					varidx_delta_map (varidx_delta_map_),
-					normalized_coords (normalized_coords_),
-					var_store (var_store_),
 					glyph_set (glyph_set_),
-					gpos_lookups (gpos_lookups_),
-					store_cache (store_cache_) {}
+					gpos_lookups (gpos_lookups_) {}
 };
 
 template<typename OutputArray>
@@ -3984,17 +3972,7 @@ struct VariationDevice
   }
 
   void collect_variation_index (hb_collect_variation_indices_context_t *c) const
-  {
-    c->layout_variation_indices->add (varIdx);
-    int delta = 0;
-    if (c->normalized_coords && c->var_store)
-      delta = roundf (c->var_store->get_delta (varIdx, c->normalized_coords->arrayZ,
-                                               c->normalized_coords->length, c->store_cache));
-
-    /* set new varidx to HB_OT_LAYOUT_NO_VARIATIONS_INDEX here, will remap
-     * varidx later*/
-    c->varidx_delta_map->set (varIdx, hb_pair_t<unsigned, int> (HB_OT_LAYOUT_NO_VARIATIONS_INDEX, delta));
-  }
+  { c->layout_variation_indices->add (varIdx); }
 
   bool sanitize (hb_sanitize_context_t *c) const
   {

src/hb-subset-plan.cc

@@ -399,34 +399,20 @@ _collect_layout_variation_indices (hb_subset_plan_t* plan)
     return;
   }
 
-  const OT::VariationStore *var_store = nullptr;
   hb_set_t varidx_set;
-  float *store_cache = nullptr;
-  bool collect_delta = plan->pinned_at_default ? false : true;
-  if (collect_delta)
-  {
-    if (gdef->has_var_store ())
-    {
-      var_store = &(gdef->get_var_store ());
-      store_cache = var_store->create_cache ();
-    }
-  }
-
   OT::hb_collect_variation_indices_context_t c (&varidx_set,
-                                                &plan->layout_variation_idx_delta_map,
-                                                plan->normalized_coords ? &(plan->normalized_coords) : nullptr,
-                                                var_store,
                                                 &plan->_glyphset_gsub,
-                                                &plan->gpos_lookups,
-                                                store_cache);
+                                                &plan->gpos_lookups);
   gdef->collect_variation_indices (&c);
 
   if (hb_ot_layout_has_positioning (plan->source))
     gpos->collect_variation_indices (&c);
 
-  var_store->destroy_cache (store_cache);
-
-  gdef->remap_layout_variation_indices (&varidx_set, &plan->layout_variation_idx_delta_map);
+  gdef->remap_layout_variation_indices (&varidx_set,
+                                        plan->normalized_coords,
+                                        !plan->pinned_at_default,
+                                        plan->all_axes_pinned,
+                                        &plan->layout_variation_idx_delta_map);
 
   unsigned subtable_count = gdef->has_var_store () ? gdef->get_var_store ().get_sub_table_count () : 0;
   _generate_varstore_inner_maps (varidx_set, subtable_count, plan->gdef_varstore_inner_maps);