New cpp folder structure

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

libs/drape_frontend/rule_drawer.hpp

@@ -0,0 +1,87 @@
+#pragma once
+
+#include "drape_frontend/custom_features_context.hpp"
+#include "drape_frontend/map_shape.hpp"
+#include "drape_frontend/metaline_manager.hpp"
+#include "drape_frontend/tile_key.hpp"
+#include "drape_frontend/traffic_generator.hpp"
+
+#include "drape/pointers.hpp"
+
+#include "indexer/road_shields_parser.hpp"
+
+#include "geometry/rect2d.hpp"
+#include "geometry/screenbase.hpp"
+
+#include <array>
+#include <functional>
+#include <map>
+#include <string>
+#include <unordered_set>
+
+class FeatureType;
+
+namespace df
+{
+class EngineContext;
+class Stylist;
+
+/*
+ * RuleDrawer() is invoked for each feature in the tile.
+ * It creates a Stylist which filters suitable drawing rules for the feature.
+ * Then passes on the drawing rules to ApplyPoint/Area/LineFeature objects
+ * which create corresponding MapShape objects (which might in turn create OverlayHandles).
+ * The RuleDrawer flushes geometry MapShapes immediately for each feature,
+ * while overlay MapShapes are flushed altogether after all features are processed.
+ */
+class RuleDrawer
+{
+public:
+  using TCheckCancelledCallback = std::function<bool()>;
+  using TIsCountryLoadedByNameFn = std::function<bool(std::string_view)>;
+  using TInsertShapeFn = std::function<void(drape_ptr<MapShape> && shape)>;
+
+  RuleDrawer(TCheckCancelledCallback const & checkCancelled,
+             TIsCountryLoadedByNameFn const & isLoadedFn,
+             ref_ptr<EngineContext> engineContext, int8_t deviceLang);
+  ~RuleDrawer();
+
+  void operator()(FeatureType & f);
+
+#ifdef DRAW_TILE_NET
+  void DrawTileNet();
+#endif
+
+private:
+  void ProcessAreaAndPointStyle(FeatureType & f, Stylist const & s, TInsertShapeFn const & insertShape);
+  void ProcessLineStyle(FeatureType & f, Stylist const & s, TInsertShapeFn const & insertShape);
+  void ProcessPointStyle(FeatureType & f, Stylist const & s, TInsertShapeFn const & insertShape);
+
+  bool CheckCoastlines(FeatureType & f);
+
+  bool CheckCancelled();
+
+  bool IsDiscardCustomFeature(FeatureID const & id) const;
+
+  TCheckCancelledCallback m_checkCancelled;
+  TIsCountryLoadedByNameFn m_isLoadedFn;
+
+  ref_ptr<EngineContext> m_context;
+  CustomFeaturesContextPtr m_customFeaturesContext;
+  int8_t m_deviceLang;
+  std::unordered_set<m2::Spline const *> m_usedMetalines;
+
+  m2::RectD m_globalRect;
+  double m_currentScaleGtoP;
+  double m_trafficScalePtoG;
+
+  TrafficSegmentsGeometry m_trafficGeometry;
+
+  std::array<TMapShapes, df::MapShapeTypeCount> m_mapShapes;
+
+  GeneratedRoadShields m_generatedRoadShields;
+
+  uint8_t m_zoomLevel = 0;
+  bool m_wasCancelled = false;
+};
+}  // namespace df