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Diffstat (limited to 'src/mbgl/renderer/data_driven_property_evaluator.hpp')
-rw-r--r-- | src/mbgl/renderer/data_driven_property_evaluator.hpp | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/mbgl/renderer/data_driven_property_evaluator.hpp b/src/mbgl/renderer/data_driven_property_evaluator.hpp new file mode 100644 index 0000000000..6406b3478b --- /dev/null +++ b/src/mbgl/renderer/data_driven_property_evaluator.hpp @@ -0,0 +1,40 @@ +#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 { + return ResultType(function.evaluate(parameters.z)); + } + + template <class Function> + ResultType operator()(const Function& function) const { + return ResultType(function); + } + +private: + const PropertyEvaluationParameters& parameters; + T defaultValue; +}; + +} // namespace mbgl |