Add public api methods to get/set the layout features to retain.

src/hb-subset-input.cc

@@ -248,6 +248,26 @@ hb_subset_input_namelangid_set (hb_subset_input_t *subset_input)
   return subset_input->name_languages;
 }
 
+HB_EXTERN hb_set_t *
+hb_subset_input_layout_features_set (hb_subset_input_t *subset_input)
+{
+  return subset_input->layout_features;
+}
+
+HB_EXTERN void
+hb_subset_input_set_retain_all_features (hb_subset_input_t *subset_input,
+                                       hb_bool_t value)
+{
+  subset_input->retain_all_layout_features = value;
+}
+
+HB_EXTERN hb_bool_t
+hb_subset_input_get_retain_all_features (hb_subset_input_t *subset_input)
+{
+  return subset_input->retain_all_layout_features;
+}
+
+
 HB_EXTERN hb_set_t *
 hb_subset_input_drop_tables_set (hb_subset_input_t *subset_input)
 {

src/hb-subset.h

@@ -60,6 +60,15 @@ hb_subset_input_nameid_set (hb_subset_input_t *subset_input);
 HB_EXTERN hb_set_t *
 hb_subset_input_namelangid_set (hb_subset_input_t *subset_input);
 
+HB_EXTERN hb_set_t *
+hb_subset_input_layout_features_set (hb_subset_input_t *subset_input);
+
+HB_EXTERN void
+hb_subset_input_set_retain_all_features (hb_subset_input_t *subset_input,
+                                         hb_bool_t value);
+HB_EXTERN hb_bool_t
+hb_subset_input_get_retain_all_features (hb_subset_input_t *subset_input);
+
 HB_EXTERN hb_set_t *
 hb_subset_input_drop_tables_set (hb_subset_input_t *subset_input);