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Re-use proj_transform as creating a new one is extremely expensive on libproj >= 6 (NOTE: epsg:4326 and epsg:3857 are special cases which use internal implementations and are not expensive to create on stack).

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This commit is contained in:
Artem Pavlenko 2021-03-18 15:32:13 +00:00
parent 199e609a79
commit 9c7e21fa47
1 changed files with 7 additions and 7 deletions
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14
benchmark/src/test_proj_transform1.cpp
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@ -9,7 +9,7 @@ class test : public benchmark::test_case
std::string dest_;
mapnik::box2d<double> from_;
mapnik::box2d<double> to_;
bool defer_proj4_init_;
bool defer_proj_init_;
public:
test(mapnik::parameters const& params,
std::string const& src,
@ -22,11 +22,11 @@ public:
dest_(dest),
from_(from),
to_(to),
defer_proj4_init_(defer_proj) {}
defer_proj_init_(defer_proj) {}
bool validate() const
{
mapnik::projection src(src_,defer_proj4_init_);
mapnik::projection dest(dest_,defer_proj4_init_);
mapnik::projection src(src_,defer_proj_init_);
mapnik::projection dest(dest_,defer_proj_init_);
mapnik::proj_transform tr(src,dest);
mapnik::box2d<double> bbox = from_;
if (!tr.forward(bbox)) return false;
@ -38,15 +38,15 @@ public:
}
bool operator()() const
{
mapnik::projection src(src_,defer_proj_init_);
mapnik::projection dest(dest_,defer_proj_init_);
mapnik::proj_transform tr(src,dest);
for (std::size_t i=0;i<iterations_;++i)
{
for (int j=-180;j<180;j=j+5)
{
for (int k=-85;k<85;k=k+5)
{
mapnik::projection src(src_,defer_proj4_init_);
mapnik::projection dest(dest_,defer_proj4_init_);
mapnik::proj_transform tr(src,dest);
mapnik::box2d<double> box(j,k,j,k);
if (!tr.forward(box)) throw std::runtime_error("could not transform coords");
}