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Simplify proj_transform_cache implementation (ref https://github.com/mapnik/mapnik/pull/4191#issuecomment-813377082)

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This commit is contained in:
Artem Pavlenko 2021-04-06 10:30:12 +01:00
parent bb18a5ba0a
commit b974a4a683
5 changed files with 60 additions and 79 deletions
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4
include/mapnik/feature_style_processor_impl.hpp
View file

@ -254,7 +254,7 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
}
processor_context_ptr current_ctx = ds->get_context(ctx_map);
proj_transform const* proj_trans_ptr = m_.get_proj_transform(mat.proj0_.params(), mat.proj1_.params());
proj_transform const* proj_trans_ptr = proj_transform_cache::get(mat.proj0_.params(), mat.proj1_.params());
box2d<double> query_ext = extent; // unbuffered
box2d<double> buffered_query_ext(query_ext); // buffered
@ -493,7 +493,7 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
layer const& lay = mat.lay_;
std::vector<rule_cache> const & rule_caches = mat.rule_caches_;
proj_transform const* proj_trans_ptr = m_.get_proj_transform(mat.proj0_.params(), mat.proj1_.params());
proj_transform const* proj_trans_ptr = proj_transform_cache::get(mat.proj0_.params(), mat.proj1_.params());
bool cache_features = lay.cache_features() && active_styles.size() > 1;
datasource_ptr ds = lay.datasource();

7
include/mapnik/map.hpp
View file

@ -33,7 +33,6 @@
#include <mapnik/well_known_srs.hpp>
#include <mapnik/image_compositing.hpp>
#include <mapnik/font_engine_freetype.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
@ -53,7 +52,6 @@ using featureset_ptr = std::shared_ptr<Featureset>;
class feature_type_style;
class view_transform;
class layer;
struct proj_transform_cache;
class MAPNIK_DECL Map : boost::equality_comparable<Map>
{
@ -103,7 +101,7 @@ private:
boost::optional<std::string> font_directory_;
freetype_engine::font_file_mapping_type font_file_mapping_;
freetype_engine::font_memory_cache_type font_memory_cache_;
std::unique_ptr<proj_transform_cache> proj_cache_;
public:
using const_style_iterator = std::map<std::string,feature_type_style>::const_iterator;
using style_iterator = std::map<std::string,feature_type_style>::iterator;
@ -501,12 +499,9 @@ public:
return font_memory_cache_;
}
proj_transform const* get_proj_transform(std::string const& source, std::string const& dest) const;
private:
friend void swap(Map & rhs, Map & lhs);
void fixAspectRatio();
void init_proj_transform(std::string const& source, std::string const& dest);
void init_proj_transforms();
};

52
include/mapnik/proj_transform_cache.hpp
View file

@ -24,53 +24,17 @@
#ifndef MAPNIK_PROJ_TRANSFORM_CACHE_HPP
#define MAPNIK_PROJ_TRANSFORM_CACHE_HPP
#include <mapnik/util/noncopyable.hpp>
#include <mapnik/proj_transform.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
#include <boost/functional/hash.hpp>
#include <boost/unordered_map.hpp>
#include <boost/utility/string_view.hpp>
MAPNIK_DISABLE_WARNING_POP
#include <mapnik/config.hpp>
#include <string>
namespace mapnik {
class proj_transform; // fwd decl
namespace proj_transform_cache {
struct proj_transform_cache : util::noncopyable
{
using key_type = std::pair<std::string, std::string>;
using compatible_key_type = std::pair<boost::string_view, boost::string_view>;
void MAPNIK_DECL init(std::string const& source, std::string const& dest);
proj_transform const* MAPNIK_DECL get(std::string const& source, std::string const& dest);
struct compatible_hash
{
template <typename KeyType>
std::size_t operator() (KeyType const& key) const
{
using hash_type = boost::hash<typename KeyType::first_type>;
std::size_t seed = hash_type{}(key.first);
seed ^= hash_type{}(key.second) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
return seed;
}
};
struct compatible_predicate
{
bool operator()(compatible_key_type const& k1,
compatible_key_type const& k2) const
{
return k1 == k2;
}
};
using cache_type = boost::unordered_map<key_type, std::unique_ptr<proj_transform>, compatible_hash>;
proj_transform_cache() = default;
thread_local static cache_type cache_;
void init(std::string const& source, std::string const& dest) const;
proj_transform const* get(std::string const& source, std::string const& dest) const;
};
}
} // namespace proj_transform_cache
} // mamespace mapnik
#endif // MAPNIK_PROJ_TRANSFORM_CACHE_HPP

32
src/map.cpp
View file

@ -76,8 +76,7 @@ Map::Map()
extra_params_(),
font_directory_(),
font_file_mapping_(),
font_memory_cache_(),
proj_cache_(std::make_unique<proj_transform_cache>()) {}
font_memory_cache_() {}
Map::Map(int width,int height, std::string const& srs)
: width_(width),
@ -91,8 +90,7 @@ Map::Map(int width,int height, std::string const& srs)
extra_params_(),
font_directory_(),
font_file_mapping_(),
font_memory_cache_(),
proj_cache_(std::make_unique<proj_transform_cache>()) {}
font_memory_cache_() {}
Map::Map(Map const& rhs)
: width_(rhs.width_),
@ -114,8 +112,7 @@ Map::Map(Map const& rhs)
font_directory_(rhs.font_directory_),
font_file_mapping_(rhs.font_file_mapping_),
// on copy discard memory caches
font_memory_cache_(),
proj_cache_(std::make_unique<proj_transform_cache>())
font_memory_cache_()
{
init_proj_transforms();
}
@ -140,8 +137,7 @@ Map::Map(Map && rhs)
extra_params_(std::move(rhs.extra_params_)),
font_directory_(std::move(rhs.font_directory_)),
font_file_mapping_(std::move(rhs.font_file_mapping_)),
font_memory_cache_(std::move(rhs.font_memory_cache_)),
proj_cache_(std::move(rhs.proj_cache_)) {}
font_memory_cache_(std::move(rhs.font_memory_cache_)) {}
Map::~Map() {}
@ -333,13 +329,13 @@ size_t Map::layer_count() const
void Map::add_layer(layer const& l)
{
init_proj_transform(srs_, l.srs());
proj_transform_cache::init(srs_, l.srs());
layers_.emplace_back(l);
}
void Map::add_layer(layer && l)
{
init_proj_transform(srs_, l.srs());
proj_transform_cache::init(srs_, l.srs());
layers_.push_back(std::move(l));
}
@ -539,7 +535,7 @@ void Map::zoom_all()
if (layer.active())
{
std::string const& layer_srs = layer.srs();
proj_transform const* proj_trans_ptr = proj_cache_->get(srs_, layer_srs);;
proj_transform const* proj_trans_ptr = proj_transform_cache::get(srs_, layer_srs);
box2d<double> layer_ext = layer.envelope();
if (proj_trans_ptr->backward(layer_ext, PROJ_ENVELOPE_POINTS))
{
@ -719,7 +715,7 @@ featureset_ptr Map::query_point(unsigned index, double x, double y) const
mapnik::datasource_ptr ds = layer.datasource();
if (ds)
{
proj_transform const* proj_trans_ptr = proj_cache_->get(layer.srs(), srs_);
proj_transform const* proj_trans_ptr = proj_transform_cache::get(layer.srs(), srs_);
double z = 0;
if (!proj_trans_ptr->equal() && !proj_trans_ptr->backward(x,y,z))
{
@ -782,23 +778,13 @@ void Map::set_extra_parameters(parameters& params)
extra_params_ = params;
}
mapnik::proj_transform const* Map::get_proj_transform(std::string const& source, std::string const& dest) const
{
return proj_cache_->get(source, dest);
}
void Map::init_proj_transform(std::string const& source, std::string const& dest)
{
proj_cache_->init(source, dest);
}
void Map::init_proj_transforms()
{
std::for_each(layers_.begin(),
layers_.end(),
[this] (auto const& l)
{
init_proj_transform(srs_, l.srs());
proj_transform_cache::init(srs_, l.srs());
});
}

44
src/proj_transform_cache.cpp
View file

@ -20,13 +20,49 @@
*
*****************************************************************************/
#include <mapnik/proj_transform_cache.hpp>
#include <mapnik/proj_transform.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
#include <boost/functional/hash.hpp>
#include <boost/unordered_map.hpp>
#include <boost/utility/string_view.hpp>
MAPNIK_DISABLE_WARNING_POP
namespace mapnik {
namespace proj_transform_cache {
namespace {
using key_type = std::pair<std::string, std::string>;
using compatible_key_type = std::pair<boost::string_view, boost::string_view>;
thread_local proj_transform_cache::cache_type proj_transform_cache::cache_ = cache_type();
struct compatible_hash
{
template <typename KeyType>
std::size_t operator() (KeyType const& key) const
{
using hash_type = boost::hash<typename KeyType::first_type>;
std::size_t seed = hash_type{}(key.first);
seed ^= hash_type{}(key.second) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
return seed;
}
};
void proj_transform_cache::init(std::string const& source, std::string const& dest) const
struct compatible_predicate
{
bool operator()(compatible_key_type const& k1,
compatible_key_type const& k2) const
{
return k1 == k2;
}
};
using cache_type = boost::unordered_map<key_type, std::unique_ptr<proj_transform>, compatible_hash>;
thread_local static cache_type cache_ = {};
} // namespace
void init(std::string const& source, std::string const& dest)
{
compatible_key_type key = std::make_pair<boost::string_view, boost::string_view>(source, dest);
auto itr = cache_.find(key, compatible_hash{}, compatible_predicate{});
@ -39,7 +75,7 @@ void proj_transform_cache::init(std::string const& source, std::string const& de
}
}
proj_transform const* proj_transform_cache::get(std::string const& source, std::string const& dest) const
proj_transform const* get(std::string const& source, std::string const& dest)
{
compatible_key_type key = std::make_pair<boost::string_view, boost::string_view>(source, dest);
@ -54,5 +90,5 @@ proj_transform const* proj_transform_cache::get(std::string const& source, std::
return itr->second.get();
}
} // namespace proj_transform_cache
} // namespace mapnik