2a8ebc4906
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
139 lines
4.3 KiB
C++
139 lines
4.3 KiB
C++
#pragma once
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#include <mln/style/types.hpp>
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#include <mln/util/chrono.hpp>
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#include <mln/util/immutable.hpp>
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#include <mapbox/std/weak.hpp>
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#include <mapbox/util/type_wrapper.hpp>
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#include <memory>
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#include <string>
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#include <optional>
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namespace mln {
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class FileSource;
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namespace style {
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class VectorSource;
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class RasterSource;
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class RasterDEMSource;
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class GeoJSONSource;
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class SourceObserver;
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struct LayerTypeInfo;
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/**
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* The runtime representation of a
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* [source](https://maplibre.org/maplibre-style-spec/sources/) from
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* the MapLibre Style Specification.
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*
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* `Source` is an abstract base class; concrete derived classes are provided for
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* each source type. `Source` contains functionality that is common to all layer
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* types:
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*
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* * Runtime type information: type predicates and casting
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* * Accessors for properties common to all source types: ID, etc.
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* * Cloning and copying
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*
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* All other functionality lives in the derived classes. To instantiate a
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* source, create an instance of the desired type, passing the ID:
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*
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* auto vectorSource = std::make_unique<VectorSource>("my-vector-source");
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*/
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class Source {
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public:
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Source(const Source&) = delete;
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Source& operator=(const Source&) = delete;
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virtual ~Source();
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/// Check whether this source is of the given subtype.
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template <class T>
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bool is() const;
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/// Dynamically cast this source to the given subtype.
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template <class T>
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requires(std::is_base_of_v<Source, T>)
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T* as() {
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if constexpr (std::is_same_v<T, Source>) {
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return this;
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}
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return is<T>() ? static_cast<T*>(this) : nullptr;
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}
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template <class T>
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requires(std::is_base_of_v<Source, T>)
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const T* as() const {
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if constexpr (std::is_same_v<T, Source>) {
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return this;
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}
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return is<T>() ? static_cast<const T*>(this) : nullptr;
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}
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SourceType getType() const;
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std::string getID() const;
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std::optional<std::string> getAttribution() const;
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// The data from the volatile sources are not stored in a persistent storage.
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bool isVolatile() const noexcept;
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void setVolatile(bool) noexcept;
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// Private implementation
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/// @cond FALSE
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class Impl;
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Immutable<Impl> baseImpl;
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void setObserver(SourceObserver*);
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SourceObserver* observer = nullptr;
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virtual void loadDescription(FileSource&) = 0;
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void setPrefetchZoomDelta(std::optional<uint8_t> delta) noexcept;
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std::optional<uint8_t> getPrefetchZoomDelta() const noexcept;
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// If the given source supports loading tiles from a server,
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// sets the minimum tile update interval.
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// Update network requests that are more frequent than the
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// minimum tile update interval are suppressed.
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//
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// Default value is `Duration::zero()`.
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void setMinimumTileUpdateInterval(Duration) noexcept;
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Duration getMinimumTileUpdateInterval() const noexcept;
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// Sets a limit for how much a parent tile can be overscaled.
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//
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// When a set of tiles for a current zoom level is being rendered and some
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// of the ideal tiles that cover the screen are not yet loaded, parent tile
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// could be used instead. This might introduce unwanted rendering
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// side-effects, especially for raster tiles that are overscaled multiple
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// times.
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//
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// For example, an overscale factor of 3 would mean that on zoom level 3,
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// the minimum zoom level of a parent tile that could be used in place of an
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// ideal tile during rendering would be zoom 0. By default, no limit is set,
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// so any parent tile may be used.
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void setMaxOverscaleFactorForParentTiles(std::optional<uint8_t> overscaleFactor) noexcept;
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std::optional<uint8_t> getMaxOverscaleFactorForParentTiles() const noexcept;
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void dumpDebugLogs() const;
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virtual bool supportsLayerType(const mln::style::LayerTypeInfo*) const = 0;
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bool loaded = false;
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// For use in SDK bindings, which store a reference to a platform-native
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// peer object here, so that separately-obtained references to this object
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// share identical platform-native peers.
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mapbox::base::TypeWrapper peer;
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virtual mapbox::base::WeakPtr<Source> makeWeakPtr() = 0;
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protected:
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explicit Source(Immutable<Impl>);
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virtual Mutable<Impl> createMutable() const noexcept = 0;
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};
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} // namespace style
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} // namespace mln
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