Hide UI preference keys behind adapter

src/legacy_preference_storage.h

@@ -10,8 +10,30 @@ struct LegacyStartupPreferenceSnapshot {
     bool vr_controllers_enabled = true;
 };
 
+struct LegacyCanvasPreferenceSnapshot {
+    float viewport_density = 1.0F;
+    int cursor_mode = 0;
+};
+
+struct LegacyUiPreferenceSnapshot {
+    bool has_rtl = false;
+    int rtl = 0;
+    std::shared_ptr<Serializer::Descriptor> state;
+};
+
+struct LegacyWindowPreferenceSnapshot {
+    bool has_ui_scale = false;
+    float ui_scale = 1.0F;
+    int show_command = 0;
+    bool has_window_rect = false;
+    glm::ivec4 window_rect {};
+};
+
 bool load_legacy_preferences();
 LegacyStartupPreferenceSnapshot read_legacy_startup_preferences(bool default_vr_controllers_enabled);
+LegacyCanvasPreferenceSnapshot read_legacy_canvas_preferences();
+LegacyUiPreferenceSnapshot read_legacy_ui_preferences();
+LegacyWindowPreferenceSnapshot read_legacy_window_preferences(int default_show_command);
 bool has_legacy_preference(const char* key);
 int legacy_integer_preference(const char* key);
 int legacy_integer_preference_or(const char* key, int default_value);
@@ -25,6 +47,9 @@ void set_legacy_ivec4_preference(const char* key, const glm::ivec4& value);
 void set_legacy_boolean_preference(const char* key, bool value);
 void set_legacy_descriptor_preference(const char* key, const Serializer::Descriptor& value);
 void unset_legacy_preference(const char* key);
+void save_legacy_ui_scale_preference(float scale);
+void set_legacy_ui_state_preferences(const Serializer::Descriptor& state, bool right_to_left);
+void set_legacy_window_preferences(int show_command, const glm::ivec4& window_rect);
 void save_legacy_boolean_preference(const char* key, bool value);
 void save_legacy_float_preference(const char* key, float value);
 bool save_legacy_preferences();