e7c3d04309
format all files Revert "format all files" This reverts commit 95d5812e49e7f916b68e786596f5a8eb5bcac414. Revert "format some files" This reverts commit ed3c8762d4d828b2b28e7b18809fc33f4f8ccaf5. format all files fix formatting in dir include fix formatting of debug macro
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include <mapnik/proj_transform_cache.hpp>
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#include <mapnik/proj_transform.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#include <boost/functional/hash.hpp>
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#include <boost/unordered_map.hpp>
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#include <boost/utility/string_view.hpp>
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MAPNIK_DISABLE_WARNING_POP
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namespace mapnik {
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namespace proj_transform_cache {
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namespace {
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using key_type = std::pair<std::string, std::string>;
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using compatible_key_type = std::pair<boost::string_view, boost::string_view>;
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struct compatible_hash
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{
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template<typename KeyType>
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std::size_t operator()(KeyType const& key) const
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{
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using hash_type = boost::hash<typename KeyType::first_type>;
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std::size_t seed = hash_type{}(key.first);
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seed ^= hash_type{}(key.second) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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return seed;
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}
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};
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struct compatible_predicate
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{
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bool operator()(compatible_key_type const& k1, compatible_key_type const& k2) const { return k1 == k2; }
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};
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using cache_type = boost::unordered_map<key_type, std::unique_ptr<proj_transform>, compatible_hash>;
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thread_local static cache_type cache_ = {};
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} // namespace
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void init(std::string const& source, std::string const& dest)
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{
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compatible_key_type key = std::make_pair<boost::string_view, boost::string_view>(source, dest);
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auto itr = cache_.find(key, compatible_hash{}, compatible_predicate{});
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if (itr == cache_.end())
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{
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mapnik::projection p0(source, true);
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mapnik::projection p1(dest, true);
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cache_.emplace(std::make_pair(source, dest), std::make_unique<proj_transform>(p0, p1));
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}
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}
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proj_transform const* get(std::string const& source, std::string const& dest)
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{
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compatible_key_type key = std::make_pair<boost::string_view, boost::string_view>(source, dest);
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auto itr = cache_.find(key, compatible_hash{}, compatible_predicate{});
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if (itr == cache_.end())
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{
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mapnik::projection srs1(source, true);
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mapnik::projection srs2(dest, true);
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return cache_.emplace(std::make_pair(source, dest), std::make_unique<proj_transform>(srs1, srs2))
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.first->second.get();
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}
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return itr->second.get();
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}
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} // namespace proj_transform_cache
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} // namespace mapnik
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