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#pragma once
#include <mbgl/style/property_value.hpp>
#include <mbgl/renderer/property_evaluation_parameters.hpp>
#include <mbgl/renderer/possibly_evaluated_property_value.hpp>
namespace mbgl {
template <typename T>
class DataDrivenPropertyEvaluator {
public:
using ResultType = PossiblyEvaluatedPropertyValue<T>;
DataDrivenPropertyEvaluator(const PropertyEvaluationParameters& parameters_, T defaultValue_)
: parameters(parameters_),
defaultValue(std::move(defaultValue_)) {}
ResultType operator()(const style::Undefined&) const {
return ResultType(defaultValue);
}
ResultType operator()(const T& constant) const {
return ResultType(constant);
}
ResultType operator()(const style::CameraFunction<T>& function) const {
if (!parameters.useIntegerZoom) {
return ResultType(function.evaluate(parameters.z));
} else {
return ResultType(function.evaluate(floor(parameters.z)));
}
}
template <class Function>
ResultType operator()(const Function& function) const {
auto returnFunction = function;
returnFunction.useIntegerZoom = parameters.useIntegerZoom;
return ResultType(returnFunction);
}
private:
const PropertyEvaluationParameters& parameters;
T defaultValue;
};
} // namespace mbgl
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