benchmark - add quad_tree creation test

benchmark/build.py

@@ -45,6 +45,7 @@ benchmarks = [
     "test_rendering_shared_map.cpp",
     "test_offset_converter.cpp",
     "test_marker_cache.cpp",
+    "test_quad_tree.cpp",
 #    "test_numeric_cast_vs_static_cast.cpp",
 ]
 for cpp_test in benchmarks:

benchmark/run

@@ -49,3 +49,11 @@ run test_offset_converter 10 1000
   --height 600 \
   --iterations 20 \
   --threads 10
+
+./benchmark/out/test_quad_tree \
+  --iterations 1000000 \
+  --threads 1
+
+./benchmark/out/test_quad_tree \
+  --iterations 10000 \
+  --threads 100

benchmark/test_quad_tree.cpp

@@ -0,0 +1,40 @@
+#include "bench_framework.hpp"
+#include <mapnik/quad_tree.hpp>
+#include <random>
+
+using quad_tree_type = mapnik::quad_tree<std::size_t>;
+
+class test : public benchmark::test_case
+{
+public:
+    test(mapnik::parameters const& params)
+     : test_case(params) {}
+
+    bool validate() const
+    {
+        return true;
+    }
+
+    bool operator()() const
+    {
+        std::random_device rd;
+        std::default_random_engine engine(rd());
+        std::uniform_int_distribution<int> uniform_dist(0, 2048);
+        std::size_t count = 0;
+        quad_tree_type tree(mapnik::box2d<double>(0,0,2048,2048));
+        for (size_t i = 0; i < iterations_; ++i)
+        {
+            int cx = uniform_dist(engine);
+            int cy = uniform_dist(engine);
+            int sx = 0.2 * uniform_dist(engine);
+            int sy = 0.2 * uniform_dist(engine);
+            mapnik::box2d<double> box(cx - sx,cy - sy, cx + sx, cy + sy);
+            tree.insert(i, box);
+            count++;
+        }
+
+        return true;
+    }
+};
+
+BENCHMARK(test,"quad_tree creation")