layers: introduce layers.hpp and .cpp for layer related code

Signed-off-by: Marcus Fritzsch <marcus_fritzsch@mentor.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/layers.hpp b/src/layers.hpp
new file mode 100644
index 0000000..7b35c63
--- /dev/null
+++ b/src/layers.hpp
@@ -0,0 +1,59 @@
+//
+// Created by m on 7/27/17.
+//
+
+#ifndef TMCAGLWM_LAYERS_H
+#define TMCAGLWM_LAYERS_H
+
+#include <algorithm>
+#include <experimental/optional>
+#include <json.hpp>
+#include <set>
+#include <string>
+
+#include "result.hpp"
+
+namespace wm {
+
+struct surface_id_to_layer {
+   int id_min = -1;
+   int id_max = -1;
+   std::string name = "";
+   int layer_id = -1;
+
+   explicit surface_id_to_layer(nlohmann::json const &j);
+
+   bool operator<(struct surface_id_to_layer const &rhs) const {
+      return this->id_max < rhs.id_max;
+   }
+};
+
+inline bool operator<(struct surface_id_to_layer const &a, int b) {
+   return a.id_max < b;
+}
+
+struct surface_id_to_layer_map {
+   typedef std::set<struct surface_id_to_layer> map_type;
+
+   map_type mapping;
+
+   std::experimental::optional<int> get_layer_for_surface(int surface_id) {
+      auto i = std::lower_bound(std::cbegin(this->mapping),
+                                std::cend(this->mapping), surface_id);
+
+      if (i != this->mapping.end()) {
+         if (i->id_min <= surface_id) {
+            return std::experimental::optional<int>(i->layer_id);
+         }
+      }
+
+      return std::experimental::nullopt;
+   }
+};
+
+struct result<struct surface_id_to_layer_map> to_surface_id_to_layer_map(
+   nlohmann::json const &j);
+
+}  // namespace wm
+
+#endif  // TMCAGLWM_LAYERS_H