122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
#pragma once
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#include <mbgl/style/expression/expression.hpp>
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#include <mbgl/style/expression/interpolate.hpp>
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#include <mbgl/style/expression/step.hpp>
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#include <mbgl/style/expression/find_zoom_curve.hpp>
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#include <mbgl/style/expression/value.hpp>
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#include <mbgl/style/expression/is_constant.hpp>
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#include <mbgl/style/function/convert.hpp>
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#include <mbgl/style/function/composite_exponential_stops.hpp>
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#include <mbgl/style/function/composite_interval_stops.hpp>
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#include <mbgl/style/function/composite_categorical_stops.hpp>
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#include <mbgl/util/interpolate.hpp>
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#include <mbgl/util/range.hpp>
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#include <mbgl/util/variant.hpp>
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#include <string>
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#include <tuple>
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namespace mbgl {
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class GeometryTileFeature;
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namespace style {
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// A CompositeFunction consists of an outer zoom function whose stop range values are
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// "inner" source functions. It provides the GL Native implementation of
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// "zoom-and-property" functions from the style spec.
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template <class T>
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class CompositeFunction {
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public:
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using InnerStops = std::conditional_t<
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util::Interpolatable<T>::value,
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variant<
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ExponentialStops<T>,
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IntervalStops<T>,
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CategoricalStops<T>>,
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variant<
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IntervalStops<T>,
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CategoricalStops<T>>>;
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using Stops = std::conditional_t<
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util::Interpolatable<T>::value,
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variant<
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CompositeExponentialStops<T>,
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CompositeIntervalStops<T>,
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CompositeCategoricalStops<T>>,
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variant<
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CompositeIntervalStops<T>,
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CompositeCategoricalStops<T>>>;
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CompositeFunction(std::unique_ptr<expression::Expression> expression_)
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: expression(std::move(expression_)),
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zoomCurve(expression::findZoomCurveChecked(expression.get()))
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{
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assert(!expression::isZoomConstant(*expression));
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assert(!expression::isFeatureConstant(*expression));
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}
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CompositeFunction(std::string property_, Stops stops_, optional<T> defaultValue_ = {})
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: property(std::move(property_)),
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stops(std::move(stops_)),
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defaultValue(std::move(defaultValue_)),
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expression(stops.match([&] (const auto& s) {
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return expression::Convert::toExpression(property, s);
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})),
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zoomCurve(expression::findZoomCurveChecked(expression.get()))
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{}
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// Return the range obtained by evaluating the function at each of the zoom levels in zoomRange
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template <class Feature>
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Range<T> evaluate(const Range<float>& zoomRange, const Feature& feature, T finalDefaultValue) {
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return Range<T> {
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evaluate(zoomRange.min, feature, finalDefaultValue),
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evaluate(zoomRange.max, feature, finalDefaultValue)
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};
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}
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template <class Feature>
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T evaluate(float zoom, const Feature& feature, T finalDefaultValue) const {
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const expression::EvaluationResult result = expression->evaluate(expression::EvaluationContext({zoom}, &feature));
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if (result) {
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const optional<T> typed = expression::fromExpressionValue<T>(*result);
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return typed ? *typed : defaultValue ? *defaultValue : finalDefaultValue;
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}
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return defaultValue ? *defaultValue : finalDefaultValue;
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}
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float interpolationFactor(const Range<float>& inputLevels, const float inputValue) const {
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return zoomCurve.match(
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[&](const expression::InterpolateBase* z) {
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return z->interpolationFactor(Range<double> { inputLevels.min, inputLevels.max }, inputValue);
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},
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[&](const expression::Step*) { return 0.0f; }
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);
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}
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Range<float> getCoveringStops(const float lower, const float upper) const {
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return zoomCurve.match(
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[&](auto z) { return z->getCoveringStops(lower, upper); }
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);
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}
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friend bool operator==(const CompositeFunction& lhs,
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const CompositeFunction& rhs) {
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return *lhs.expression == *rhs.expression;
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}
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std::string property;
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Stops stops;
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optional<T> defaultValue;
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bool useIntegerZoom = false;
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private:
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std::shared_ptr<expression::Expression> expression;
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const variant<const expression::InterpolateBase*, const expression::Step*> zoomCurve;
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};
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} // namespace style
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} // namespace mbgl
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