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#pragma once
#include <mbgl/renderer/cross_faded_property_evaluator.hpp>
#include <mbgl/renderer/possibly_evaluated_property_value.hpp>
#include <mbgl/renderer/property_evaluation_parameters.hpp>
#include <mbgl/style/property_value.hpp>
#include <cmath>
namespace mbgl {
template <typename T, bool useIntegerZoom = false>
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::PropertyExpression<T>& expression) const {
if (useIntegerZoom) { // Compiler will optimize out the unused branch.
if (!expression.isFeatureConstant() || !expression.isRuntimeConstant()) {
auto returnExpression = expression;
returnExpression.useIntegerZoom = true;
return ResultType(returnExpression);
}
return ResultType(expression.evaluate(std::floor(parameters.z)));
} else {
if (!expression.isFeatureConstant() || !expression.isRuntimeConstant()) {
return ResultType(expression);
}
return ResultType(expression.evaluate(parameters.z));
}
}
private:
const PropertyEvaluationParameters& parameters;
T defaultValue;
};
template <typename T>
class DataDrivenPropertyEvaluator<Faded<T>> {
public:
using ResultType = PossiblyEvaluatedPropertyValue<Faded<T>>;
DataDrivenPropertyEvaluator(const PropertyEvaluationParameters& parameters_, T defaultValue_)
: parameters(parameters_),
defaultValue(std::move(defaultValue_)) {}
ResultType operator()(const T& constant) const {
return ResultType(calculate(constant, constant, constant));
}
ResultType operator()(const style::Undefined& ) const {
return ResultType(calculate(defaultValue, defaultValue, defaultValue));
}
ResultType operator()(const style::PropertyExpression<T>& expression) const {
if (!expression.isFeatureConstant() || !expression.isRuntimeConstant()) {
return ResultType(expression);
} else {
const T evaluated = expression.evaluate(std::floor(parameters.z));
return ResultType(calculate(evaluated, evaluated, evaluated));
}
}
private:
Faded<T> calculate(const T& min, const T& mid, const T& max) const {
const float z = parameters.z;
return z > parameters.zoomHistory.lastIntegerZoom
? Faded<T> { min, mid }
: Faded<T> { max, mid };
};
const PropertyEvaluationParameters& parameters;
T defaultValue;
};
} // namespace mbgl
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