benchmark: add tests for longlat/merc transformations

benchmark/run.cpp

@@ -269,6 +269,64 @@ struct test5
 };
 
 
+#include <mapnik/box2d.hpp>
+#include <mapnik/projection.hpp>
+#include <mapnik/proj_transform.hpp>
+#include <mapnik/well_known_srs.hpp>
+
+struct test6
+{
+    unsigned iter_;
+    unsigned threads_;
+    std::string src_;
+    std::string dest_;
+    mapnik::box2d<double> from_;
+    mapnik::box2d<double> to_;
+    explicit test6(unsigned iterations,
+                   unsigned threads,
+                   std::string const& src,
+                   std::string const& dest,
+                   mapnik::box2d<double> from,
+                   mapnik::box2d<double> to) :
+      iter_(iterations),
+      threads_(threads),
+      src_(src),
+      dest_(dest),
+      from_(from),
+      to_(to) {}
+
+    bool validate()
+    {
+        mapnik::projection src(src_);
+        mapnik::projection dest(dest_);
+        mapnik::proj_transform tr(src,dest);
+        mapnik::box2d<double> bbox = from_;
+        if (!tr.forward(bbox)) return false;
+        return ((std::fabs(bbox.minx() - to_.minx()) < .5) &&
+                (std::fabs(bbox.maxx() - to_.maxx()) < .5) &&
+                (std::fabs(bbox.miny() - to_.miny()) < .5) &&
+                (std::fabs(bbox.maxy() - to_.maxy()) < .5)
+               );
+    }
+    void operator()()
+    {
+        mapnik::projection src(src_);
+        mapnik::projection dest(dest_);
+        mapnik::proj_transform tr(src,dest);
+        unsigned count=0;
+        for (int i=-180;i<180;i=++i)
+        {
+            for (int j=-85;j<85;++j)
+            {
+                 mapnik::box2d<double> box(i,j,i,j);
+                 if (!tr.forward(box)) throw std::runtime_error("could not transform coords");
+                 ++count;
+            }
+        }
+    }
+};
+
+
 int main( int argc, char** argv)
 {
     if (argc > 0) {
@@ -338,6 +396,41 @@ int main( int argc, char** argv)
             benchmark(runner,"double to string conversion with snprintf");
         }
 
+        mapnik::box2d<double> from(-180,-80,180,80);
+        mapnik::box2d<double> to(-20037508.3427892476,-15538711.0963092316,20037508.3427892476,15538711.0963092316);
+        {
+            // echo -180 -60 | cs2cs -f "%.10f" +init=epsg:4326 +to +init=epsg:3857
+            test6 runner(100000000,100,
+                         "+init=epsg:4326",
+                         "+init=epsg:3857",
+                         from,to);
+            benchmark(runner,"lonlat -> merc coord transformation (epsg)");
+        }
+
+        {
+            test6 runner(100000000,100,
+                         "+init=epsg:3857",
+                         "+init=epsg:4326",
+                         to,from);
+            benchmark(runner,"merc -> lonlat coord transformation (epsg)");
+        }
+
+        {
+            test6 runner(100000000,100,
+                         "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs",
+                         "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
+                         from,to);
+            benchmark(runner,"lonlat -> merc coord transformation (literal)");
+        }
+
+        {
+            test6 runner(100000000,100,
+                         "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
+                         "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs",
+                         to,from);
+            benchmark(runner,"merc -> lonlat coord transformation (literal)");
+        }
+
         std::cout << "...benchmark done\n";
         return 0;
     }