5b6a262e15
Thus we fix a potential bug: if `Renderer` outlives the `Map` it will hold a stale reference to the `FileSource` instance.
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#pragma once
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#include <mbgl/storage/resource.hpp>
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#include <mbgl/tile/tile.hpp>
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namespace mbgl {
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class FileSource;
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class AsyncRequest;
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class Response;
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class Tileset;
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class TileParameters;
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template <typename T>
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class TileLoader {
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public:
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TileLoader(const TileLoader&) = delete;
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TileLoader& operator=(const TileLoader&) = delete;
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TileLoader(T&,
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const OverscaledTileID&,
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const TileParameters&,
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const Tileset&);
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~TileLoader();
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void setNecessity(TileNecessity newNecessity) {
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if (newNecessity != necessity) {
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necessity = newNecessity;
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if (necessity == TileNecessity::Required) {
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makeRequired();
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} else {
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makeOptional();
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}
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}
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}
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private:
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// called when the tile is one of the ideal tiles that we want to show definitely. the tile source
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// should try to make every effort (e.g. fetch from internet, or revalidate existing resources).
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void makeRequired();
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// called when the zoom level no longer corresponds to the displayed one, but
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// we're still interested in retaining the tile, e.g. for backfill.
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// subclassed TileSources should cancel actions they are taking to provide
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// an up-to-date version or load new data
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void makeOptional();
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void loadFromCache();
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void loadedData(const Response&);
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void loadFromNetwork();
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T& tile;
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TileNecessity necessity;
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Resource resource;
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std::shared_ptr<FileSource> fileSource;
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std::unique_ptr<AsyncRequest> request;
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};
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} // namespace mbgl
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