feat(display): add display mode remapping option (#3529)

Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>

src/config.cpp

@@ -379,6 +379,38 @@ namespace config {
 #undef _CONVERT_2_ARG_
       return video_t::dd_t::hdr_option_e::disabled;  // Default to this if value is invalid
     }
+
+    video_t::dd_t::mode_remapping_t
+    mode_remapping_from_view(const std::string_view value) {
+      const auto parse_entry_list { [](const auto &entry_list, auto &output_field) {
+        for (auto &[_, entry] : entry_list) {
+          auto requested_resolution = entry.template get_optional<std::string>("requested_resolution"s);
+          auto requested_fps = entry.template get_optional<std::string>("requested_fps"s);
+          auto final_resolution = entry.template get_optional<std::string>("final_resolution"s);
+          auto final_refresh_rate = entry.template get_optional<std::string>("final_refresh_rate"s);
+
+          output_field.push_back(video_t::dd_t::mode_remapping_entry_t {
+            requested_resolution.value_or(""),
+            requested_fps.value_or(""),
+            final_resolution.value_or(""),
+            final_refresh_rate.value_or("") });
+        }
+      } };
+
+      // We need to add a wrapping object to make it valid JSON, otherwise ptree cannot parse it.
+      std::stringstream json_stream;
+      json_stream << "{\"dd_mode_remapping\":" << value << "}";
+
+      boost::property_tree::ptree json_tree;
+      boost::property_tree::read_json(json_stream, json_tree);
+
+      video_t::dd_t::mode_remapping_t output;
+      parse_entry_list(json_tree.get_child("dd_mode_remapping.mixed"), output.mixed);
+      parse_entry_list(json_tree.get_child("dd_mode_remapping.resolution_only"), output.resolution_only);
+      parse_entry_list(json_tree.get_child("dd_mode_remapping.refresh_rate_only"), output.refresh_rate_only);
+
+      return output;
+    }
   }  // namespace dd
 
   video_t video {
@@ -447,6 +479,7 @@ namespace config {
       {},  // manual_refresh_rate
       video_t::dd_t::hdr_option_e::automatic,  // hdr_option
       3s,  // config_revert_delay
+      {},  // mode_remapping
       {}  // wa
     },  // display_device
 
@@ -1105,6 +1138,7 @@ namespace config {
         video.dd.config_revert_delay = std::chrono::milliseconds { value };
       }
     }
+    generic_f(vars, "dd_mode_remapping", video.dd.mode_remapping, dd::mode_remapping_from_view);
     bool_f(vars, "dd_wa_hdr_toggle", video.dd.wa.hdr_toggle);
 
     int_between_f(vars, "min_fps_factor", video.min_fps_factor, { 1, 3 });