+
+using json = nlohmann::json;
+
+struct wm::area area_from_json(json const &j) {
+ DB(j);
+ return wm::area{
+ j["name"].get<std::string>(),
+ {
+ get<uint32_t>(j["width"]), get<uint32_t>(j["height"]),
+ get<int32_t>(j["x"]), get<int32_t>(j["y"]),
+ },
+ get<uint32_t>(j["zorder"]),
+ };
+}
+
+result<struct layout> layout_from_json(json const &j) {
+ DB(j);
+ auto &ja = j["areas"];
+
+ auto l = wm::layout{j["name"].get<std::string>(), uint32_t(ja.size()), {}};
+
+ if (ja.size() > layout::MAX_N_AREAS) {
+ return Err<struct layout>("Invalid number of areas in layout");
+ }
+
+ logdebug("Loading layout '%s' with %u areas", l.name.c_str(),
+ unsigned(ja.size()));
+
+ std::transform(std::cbegin(ja), std::cend(ja), std::begin(l.areas),
+ area_from_json);
+
+ return Ok(l);
+}
+
+struct result<layouts_type> load_layout(char const *filename) {
+ DB("loading layout from " << filename);
+
+ json jlayouts;
+ std::ifstream i(filename);
+ i >> jlayouts;
+
+ auto layouts = layouts_type();
+ std::transform(std::cbegin(jlayouts), std::cend(jlayouts),
+ std::back_inserter(layouts), layout_from_json);
+
+ return Ok(layouts);
+}
+
+struct result<surface_id_to_layer_map>
+ load_layer_ids(char const *filename) {
+ DB("loading IDs from " << filename);
+
+ json jids;
+ std::ifstream i(filename);
+ i >> jids;
+
+ auto m = to_surface_id_to_layer_map(jids["mappings"]);
+
+ if (m.is_ok()) {
+ auto i = m.unwrap();
+
+ auto jtests = jids.value("tests", json());
+
+ std::vector<std::pair<int, int>> tests;
+ std::transform(std::cbegin(jtests), std::cend(jtests),
+ std::back_inserter(tests), [](json const &j) {
+ return std::make_pair(get<int>(j["surface_id"]),
+ get<int>(j["expect_layer_id"]));
+ });
+
+ for (auto sid : tests) {
+ if (i.get_layer_for_surface(sid.first).value_or(-1) != sid.second) {
+ return Err<surface_id_to_layer_map>("ID Map embedded test failed!");
+ }
+ }
+ }
+
+ return m;
+}
+