diff options
Diffstat (limited to 'src/mbgl/tile/tile_cache.cpp')
-rw-r--r-- | src/mbgl/tile/tile_cache.cpp | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/mbgl/tile/tile_cache.cpp b/src/mbgl/tile/tile_cache.cpp new file mode 100644 index 0000000000..423b355827 --- /dev/null +++ b/src/mbgl/tile/tile_cache.cpp @@ -0,0 +1,65 @@ +#include <mbgl/tile/tile_cache.hpp> +#include <mbgl/tile/tile_data.hpp> + +#include <cassert> + +namespace mbgl { + +void TileCache::setSize(size_t size_) { + size = size_; + + while (orderedKeys.size() > size) { + auto key = orderedKeys.front(); + orderedKeys.pop_front(); + tiles.erase(key); + } + + assert(orderedKeys.size() <= size); + + tiles.reserve(size); +} + +void TileCache::add(uint64_t key, std::shared_ptr<TileData> data) { + + // insert new or query existing data + if (tiles.emplace(key, data).second) { + // remove existing data key + orderedKeys.remove(key); + } + + // (re-)insert data key as newest + orderedKeys.push_back(key); + + // purge oldest key/data if necessary + if (orderedKeys.size() > size) { + get(orderedKeys.front()); + } + + assert(orderedKeys.size() <= size); +}; + +std::shared_ptr<TileData> TileCache::get(uint64_t key) { + + std::shared_ptr<TileData> data; + + auto it = tiles.find(key); + if (it != tiles.end()) { + data = it->second; + tiles.erase(it); + orderedKeys.remove(key); + assert(data->isReady()); + } + + return data; +}; + +bool TileCache::has(uint64_t key) { + return tiles.find(key) != tiles.end(); +} + +void TileCache::clear() { + orderedKeys.clear(); + tiles.clear(); +} + +} // namespace mbgl |