591af0021b
* Eliminate updateBatch in favor of diffing layers and detecting changes to properties upon which layout depends.
* Replace RenderSource::{update,remove,invalidate,reload}Tiles with a single update method
* Replace TilePyramid::{update,remove,invalidate,reload}Tiles with a single update method
* Remove Style& dependency TODO from GeometryTile and TileParameters
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
#pragma once
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#include <mbgl/util/variant.hpp>
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#include <mbgl/style/undefined.hpp>
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#include <mbgl/style/function/camera_function.hpp>
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namespace mbgl {
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namespace style {
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template <class T>
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class PropertyValue {
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private:
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using Value = variant<Undefined, T, CameraFunction<T>>;
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Value value;
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friend bool operator==(const PropertyValue& lhs, const PropertyValue& rhs) {
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return lhs.value == rhs.value;
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}
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friend bool operator!=(const PropertyValue& lhs, const PropertyValue& rhs) {
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return !(lhs == rhs);
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}
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public:
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PropertyValue() : value() {}
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PropertyValue( T constant) : value(constant) {}
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PropertyValue(CameraFunction<T> function) : value(function) {}
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bool isUndefined() const { return value.which() == 0; }
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bool isConstant() const { return value.which() == 1; }
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bool isCameraFunction() const { return value.which() == 2; }
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bool isDataDriven() const { return false; }
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const T & asConstant() const { return value.template get< T >(); }
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const CameraFunction<T>& asCameraFunction() const { return value.template get<CameraFunction<T>>(); }
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template <typename Evaluator>
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auto evaluate(const Evaluator& evaluator, TimePoint = {}) const {
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return Value::visit(value, evaluator);
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}
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bool hasDataDrivenPropertyDifference(const PropertyValue<T>&) const {
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return false;
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}
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};
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} // namespace style
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} // namespace mbgl
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