[varc] Implement conditionSets

src/OT/Var/VARC/VARC.cc

@@ -173,6 +173,16 @@ VarComponent::get_path_at (hb_font_t *font,
     record += HBGlyphID16::static_size;
   }
 
+  // ConditionSet
+  bool show = true;
+  if (flags & (unsigned) flags_t::HAVE_CONDITION)
+  {
+    unsigned conditionSetIndex;
+    READ_UINT32VAR (conditionSetIndex);
+    const auto &conditionSet = (&VARC+VARC.conditionSetList)[conditionSetIndex];
+    show = conditionSet.evaluate (coords.arrayZ, coords.length);
+  }
+
   // Axis values
 
   hb_vector_t<unsigned> axisIndices;
@@ -296,10 +306,11 @@ VarComponent::get_path_at (hb_font_t *font,
 					 &draw_session.st};
   hb_draw_session_t transformer_session {transformer_funcs, &context};
 
-  VARC.get_path_at (font, gid,
-		    transformer_session, component_coords,
-		    parent_gid,
-		    visited, edges_left, depth_left - 1);
+  if (show)
+    VARC.get_path_at (font, gid,
+		      transformer_session, component_coords,
+		      parent_gid,
+		      visited, edges_left, depth_left - 1);
 
 #undef PROCESS_TRANSFORM_COMPONENTS
 

src/OT/Var/VARC/VARC.hh

@@ -30,7 +30,7 @@ struct VarComponent
     HAVE_TRANSLATE_X		= 1u << 4,
     HAVE_TRANSLATE_Y		= 1u << 5,
     HAVE_ROTATION		= 1u << 6,
-    USE_MY_METRICS		= 1u << 7,
+    HAVE_CONDITION		= 1u << 7,
     HAVE_SCALE_X		= 1u << 8,
     HAVE_SCALE_Y		= 1u << 9,
     HAVE_TCENTER_X		= 1u << 10,
@@ -166,10 +166,11 @@ struct VARC
   FixedVersion<> version; /* Version identifier */
   Offset32To<Coverage> coverage;
   Offset32To<MultiItemVariationStore> varStore;
+  Offset32To<ConditionSetList> conditionSetList;
   Offset32To<TupleList> axisIndicesList;
   Offset32To<CFF2Index/*Of<VarCompositeGlyph>*/> glyphRecords;
   public:
-  DEFINE_SIZE_STATIC (20);
+  DEFINE_SIZE_STATIC (24);
 };
 
 #endif

src/hb-ot-layout-common.hh

@@ -3795,6 +3795,14 @@ struct ConditionSet
   DEFINE_SIZE_ARRAY (2, conditions);
 };
 
+struct ConditionSetList
+{
+  const ConditionSet& operator[] (unsigned i) const
+  { return this+conditionSets[i]; }
+
+  Array32OfOffset32To<ConditionSet> conditionSets;
+};
+
 struct FeatureTableSubstitutionRecord
 {
   friend struct FeatureTableSubstitution;