add no-op rendering benchmark - refs #2976

benchmark/build.py

@@ -46,6 +46,7 @@ benchmarks = [
     "test_offset_converter.cpp",
     "test_marker_cache.cpp",
     "test_quad_tree.cpp",
+    "test_noop_rendering.cpp",
 #    "test_numeric_cast_vs_static_cast.cpp",
 ]
 for cpp_test in benchmarks:

benchmark/test_noop_rendering.cpp

@@ -0,0 +1,53 @@
+#include "bench_framework.hpp"
+#include <mapnik/map.hpp>
+#include <mapnik/image_util.hpp>
+#include <mapnik/load_map.hpp>
+#include <mapnik/agg_renderer.hpp>
+#include <mapnik/datasource_cache.hpp>
+#include <mapnik/font_engine_freetype.hpp>
+#include <stdexcept>
+#include <mapnik/layer.hpp>
+#include <mapnik/memory_datasource.hpp>
+#include <mapnik/feature_type_style.hpp>
+
+#include <memory>
+    
+class test : public benchmark::test_case
+{
+public:
+    test(mapnik::parameters const& params)
+     : test_case(params) {}
+
+    bool validate() const
+    {
+        return true;
+    }
+    bool operator()() const
+    {
+        mapnik::Map m(256,256,"+init=epsg:3857");
+
+        mapnik::parameters params;
+        params["type"]="memory";
+        auto ds = std::make_shared<mapnik::memory_datasource>(params);
+        // add whitespace to trigger phony "reprojection"
+        mapnik::layer lay("layer",m.srs() + " ");
+        lay.set_datasource(ds);
+        lay.add_style("style");
+        m.add_layer(lay);
+        // dummy style to ensure that layer is processed
+        m.insert_style("style",mapnik::feature_type_style());
+        // dummy bbox, but "valid" because minx and miny are less
+        // with an invalid bbox then layer.visible() returns false
+        // and the initial rendering setup is not run
+        m.zoom_to_box(mapnik::box2d<double>(-1,-1,0,0));
+        for (unsigned i=0;i<iterations_;++i)
+        {
+            mapnik::image_rgba8 im(256,256);
+            mapnik::agg_renderer<mapnik::image_rgba8> ren(m,im);
+            ren.apply();
+        }
+        return true;
+    }
+};
+
+BENCHMARK(test,"rendering with reprojection")