New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/drape_frontend/route_builder.hpp

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "drape_frontend/color_constants.hpp"
+#include "drape_frontend/route_shape.hpp"
+
+#include "drape/pointers.hpp"
+
+#include "traffic/speed_groups.hpp"
+
+#include "geometry/polyline2d.hpp"
+
+#include <functional>
+#include <unordered_map>
+#include <vector>
+
+namespace dp
+{
+  class TextureManager;
+  class GraphicsContext;
+}  // namespace dp
+
+namespace df
+{
+class RouteBuilder
+{
+public:
+  using FlushFn = std::function<void(drape_ptr<SubrouteData> &&)>;
+  using FlushArrowsFn = std::function<void(drape_ptr<SubrouteArrowsData> &&)>;
+  using FlushMarkersFn = std::function<void(drape_ptr<SubrouteMarkersData> &&)>;
+
+  RouteBuilder(FlushFn && flushFn, FlushArrowsFn && flushArrowsFn,
+               FlushMarkersFn && flushMarkersFn);
+
+  void Build(ref_ptr<dp::GraphicsContext> context, dp::DrapeID subrouteId, SubrouteConstPtr subroute,
+             ref_ptr<dp::TextureManager> textures, int recacheId);
+
+  void BuildArrows(ref_ptr<dp::GraphicsContext> context, dp::DrapeID subrouteId,
+                   std::vector<ArrowBorders> const & borders, ref_ptr<dp::TextureManager> textures, int recacheId);
+
+  void ClearRouteCache();
+
+private:
+  FlushFn m_flushFn;
+  FlushArrowsFn m_flushArrowsFn;
+  FlushMarkersFn m_flushMarkersFn;
+
+  struct RouteCacheData
+  {
+    m2::PolylineD m_polyline;
+    double m_baseDepthIndex = 0.0;
+  };
+  std::unordered_map<dp::DrapeID, RouteCacheData> m_routeCache;
+};
+}  // namespace df