Refactor the vector tile constants

include/util/vector_tile.hpp

@@ -0,0 +1,37 @@
+#ifndef OSRM_UTIL_VECTOR_TILE_HPP
+#define OSRM_UTIL_VECTOR_TILE_HPP
+
+#include <cstdint>
+
+namespace osrm
+{
+namespace util
+{
+namespace vector_tile
+{
+
+const constexpr std::uint32_t LAYER_TAG = 3;
+const constexpr std::uint32_t NAME_TAG = 1;
+const constexpr std::uint32_t VERSION_TAG = 15;
+const constexpr std::uint32_t EXTEND_TAG = 5;
+const constexpr std::uint32_t FEATURE_TAG = 2;
+const constexpr std::uint32_t GEOMETRY_TAG = 3;
+const constexpr std::uint32_t VARIANT_TAG = 4;
+const constexpr std::uint32_t KEY_TAG = 3;
+const constexpr std::uint32_t ID_TAG = 1;
+const constexpr std::uint32_t GEOMETRY_TYPE_LINE = 2;
+const constexpr std::uint32_t FEATURE_ATTRIBUTES_TAG = 2;
+const constexpr std::uint32_t FEATURE_GEOMETRIES_TAG = 4;
+const constexpr std::uint32_t VARIANT_TYPE_UINT32 = 5;
+const constexpr std::uint32_t VARIANT_TYPE_BOOL = 7;
+const constexpr std::uint32_t VARIANT_TYPE_STRING = 1;
+const constexpr std::uint32_t VARIANT_TYPE_DOUBLE = 3;
+
+// Vector tiles are 4096 virtual pixels on each side
+const constexpr double EXTENT = 4096.0;
+const constexpr double BUFFER = 128.0;
+
+}
+}
+}
+#endif