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#pragma once
#include <mbgl/style/class_dictionary.hpp>
#include <mbgl/style/property_evaluator.hpp>
#include <mbgl/style/cross_faded_property_evaluator.hpp>
#include <mbgl/style/transition_options.hpp>
#include <mbgl/style/cascade_parameters.hpp>
#include <mbgl/style/property_evaluation_parameters.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/indexed_tuple.hpp>
#include <mbgl/util/ignore.hpp>
#include <unordered_map>
#include <utility>
namespace mbgl {
namespace style {
template <class T, class Evaluator>
class UnevaluatedPaintProperty {
public:
using Result = typename Evaluator::ResultType;
UnevaluatedPaintProperty() = default;
UnevaluatedPaintProperty(PropertyValue<T> value_,
UnevaluatedPaintProperty<T, Evaluator> prior_,
TransitionOptions transition,
TimePoint now)
: begin(now + transition.delay.value_or(Duration::zero())),
end(begin + transition.duration.value_or(Duration::zero())),
value(std::move(value_)) {
if (transition) {
prior = { std::move(prior_) };
}
}
Result evaluate(const PropertyEvaluationParameters& parameters, T defaultValue) {
Result finalValue = value.evaluate(Evaluator(parameters, defaultValue));
if (!prior) {
// No prior value.
return finalValue;
} else if (parameters.now >= end) {
// Transition from prior value is now complete.
prior = {};
return finalValue;
} else if (parameters.now < begin) {
// Transition hasn't started yet.
return prior->get().evaluate(parameters, defaultValue);
} else {
// Interpolate between recursively-calculated prior value and final.
float t = std::chrono::duration<float>(parameters.now - begin) / (end - begin);
return util::interpolate(prior->get().evaluate(parameters, defaultValue), finalValue, util::DEFAULT_TRANSITION_EASE.solve(t, 0.001));
}
}
bool hasTransition() const {
return bool(prior);
}
bool isUndefined() const {
return value.isUndefined();
}
private:
optional<mapbox::util::recursive_wrapper<UnevaluatedPaintProperty<T, Evaluator>>> prior;
TimePoint begin;
TimePoint end;
PropertyValue<T> value;
};
template <class T>
class CascadingPaintProperty {
public:
bool isUndefined() const {
return values.find(ClassID::Default) == values.end();
}
const PropertyValue<T>& get(const optional<std::string>& klass) const {
static const PropertyValue<T> staticValue;
const auto it = values.find(klass ? ClassDictionary::Get().lookup(*klass) : ClassID::Default);
return it == values.end() ? staticValue : it->second;
}
void set(const PropertyValue<T>& value_, const optional<std::string>& klass) {
values[klass ? ClassDictionary::Get().lookup(*klass) : ClassID::Default] = value_;
}
void setTransition(const TransitionOptions& transition, const optional<std::string>& klass) {
transitions[klass ? ClassDictionary::Get().lookup(*klass) : ClassID::Default] = transition;
}
template <class UnevaluatedPaintProperty>
UnevaluatedPaintProperty cascade(const CascadeParameters& params, UnevaluatedPaintProperty prior) const {
TransitionOptions transition;
PropertyValue<T> value;
for (const auto classID : params.classes) {
if (values.find(classID) != values.end()) {
value = values.at(classID);
break;
}
}
for (const auto classID : params.classes) {
if (transitions.find(classID) != transitions.end()) {
transition = transitions.at(classID).reverseMerge(transition);
break;
}
}
return UnevaluatedPaintProperty(std::move(value),
std::move(prior),
transition.reverseMerge(params.transition),
params.now);
}
private:
std::unordered_map<ClassID, PropertyValue<T>> values;
std::unordered_map<ClassID, TransitionOptions> transitions;
};
template <class T>
class PaintProperty {
public:
using ValueType = PropertyValue<T>;
using CascadingType = CascadingPaintProperty<T>;
using EvaluatorType = PropertyEvaluator<T>;
using UnevaluatedType = UnevaluatedPaintProperty<T, EvaluatorType>;
using EvaluatedType = T;
};
template <class T>
class CrossFadedPaintProperty {
public:
using ValueType = PropertyValue<T>;
using CascadingType = CascadingPaintProperty<T>;
using EvaluatorType = CrossFadedPropertyEvaluator<T>;
using UnevaluatedType = UnevaluatedPaintProperty<T, EvaluatorType>;
using EvaluatedType = Faded<T>;
};
template <class... Ps>
class PaintProperties {
public:
using Properties = TypeList<Ps...>;
using EvaluatedTypes = TypeList<typename Ps::EvaluatedType...>;
using UnevaluatedTypes = TypeList<typename Ps::UnevaluatedType...>;
using CascadingTypes = TypeList<typename Ps::CascadingType...>;
template <class TypeList>
using Tuple = IndexedTuple<Properties, TypeList>;
class Evaluated : public Tuple<EvaluatedTypes> {
public:
using Tuple<EvaluatedTypes>::Tuple;
};
class Unevaluated : public Tuple<UnevaluatedTypes> {
public:
using Tuple<UnevaluatedTypes>::Tuple;
};
class Cascading : public Tuple<CascadingTypes> {
public:
using Tuple<CascadingTypes>::Tuple;
};
template <class P>
auto get(const optional<std::string>& klass) const {
return cascading.template get<P>().get(klass);
}
template <class P>
void set(const typename P::ValueType& value, const optional<std::string>& klass) {
cascading.template get<P>().set(value, klass);
}
void cascade(const CascadeParameters& parameters) {
unevaluated = Unevaluated {
cascading.template get<Ps>().cascade(parameters,
std::move(unevaluated.template get<Ps>()))...
};
}
template <class P>
auto evaluate(const PropertyEvaluationParameters& parameters) {
return unevaluated.template get<P>().evaluate(parameters, P::defaultValue());
}
void evaluate(const PropertyEvaluationParameters& parameters) {
evaluated = Evaluated {
evaluate<Ps>(parameters)...
};
}
bool hasTransition() const {
bool result = false;
util::ignore({ result |= unevaluated.template get<Ps>().hasTransition()... });
return result;
}
Cascading cascading;
Unevaluated unevaluated;
Evaluated evaluated;
};
} // namespace style
} // namespace mbgl
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