[config] Add HB_NO_LAYOUT_FEATURE_PARAMS

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

src/hb-config.hh

@@ -61,6 +61,7 @@
 #define HB_NO_GETENV
 #define HB_NO_HINTING
 #define HB_NO_LANGUAGE_PRIVATE_SUBTAG
+#define HB_NO_LAYOUT_FEATURE_PARAMS
 #define HB_NO_LAYOUT_UNUSED
 #define HB_NO_MATH
 #define HB_NO_MMAP

src/hb-ot-layout-common.hh

@@ -499,6 +499,9 @@ struct FeatureParams
 {
   bool sanitize (hb_sanitize_context_t *c, hb_tag_t tag) const
   {
+#ifdef HB_NO_LAYOUT_FEATURE_PARAMS
+    return true;
+#endif
     TRACE_SANITIZE (this);
     if (tag == HB_TAG ('s','i','z','e'))
       return_trace (u.size.sanitize (c));
@@ -509,26 +512,26 @@ struct FeatureParams
     return_trace (true);
   }
 
+#ifndef HB_NO_LAYOUT_FEATURE_PARAMS
   const FeatureParamsSize& get_size_params (hb_tag_t tag) const
   {
     if (tag == HB_TAG ('s','i','z','e'))
       return u.size;
     return Null (FeatureParamsSize);
   }
-
   const FeatureParamsStylisticSet& get_stylistic_set_params (hb_tag_t tag) const
   {
     if ((tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
       return u.stylisticSet;
     return Null (FeatureParamsStylisticSet);
   }
-
   const FeatureParamsCharacterVariants& get_character_variants_params (hb_tag_t tag) const
   {
     if ((tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
       return u.characterVariants;
     return Null (FeatureParamsCharacterVariants);
   }
+#endif
 
   private:
   union {

src/hb-ot-layout.cc

@@ -1557,6 +1557,7 @@ hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
 }
 
 
+#ifndef HB_NO_LAYOUT_FEATURE_PARAMS
 /**
  * hb_ot_layout_get_size_params:
  * @face: #hb_face_t to work upon
@@ -1619,8 +1620,6 @@ hb_ot_layout_get_size_params (hb_face_t       *face,
 
   return false;
 }
-
-
 /**
  * hb_ot_layout_feature_get_name_ids:
  * @face: #hb_face_t to work upon
@@ -1695,8 +1694,6 @@ hb_ot_layout_feature_get_name_ids (hb_face_t       *face,
   if (first_param_id) *first_param_id = HB_OT_NAME_ID_INVALID;
   return false;
 }
-
-
 /**
  * hb_ot_layout_feature_get_characters:
  * @face: #hb_face_t to work upon
@@ -1750,6 +1747,7 @@ hb_ot_layout_feature_get_characters (hb_face_t      *face,
   if (char_count) *char_count = len;
   return cv_params.characters.len;
 }
+#endif
 
 
 /*