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[core] Extract Function::evaluation to a separate class (#4811)

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This allows the Function<Faded<T>> partial specialization to be eliminated, giving all property functions a consistent storage type.
This commit is contained in:
John Firebaugh
2016-04-25 09:51:47 -07:00
parent 42043599ff
commit c4089b60bc
12 changed files with 121 additions and 147 deletions
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2
src/mbgl/layer/background_layer.hpp
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@@ -10,7 +10,7 @@ class BackgroundPaintProperties {
public:
PaintProperty<float> backgroundOpacity { 1.0f };
PaintProperty<Color> backgroundColor { {{ 0, 0, 0, 1 }} };
PaintProperty<std::string, Faded<std::string>> backgroundPattern { "" };
PaintProperty<std::string, CrossFadedFunctionEvaluator> backgroundPattern { "" };
};
class BackgroundLayer : public StyleLayer {

2
src/mbgl/layer/fill_layer.hpp
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@@ -14,7 +14,7 @@ public:
PaintProperty<Color> fillOutlineColor { {{ 0, 0, 0, -1 }} };
PaintProperty<std::array<float, 2>> fillTranslate { {{ 0, 0 }} };
PaintProperty<TranslateAnchorType> fillTranslateAnchor { TranslateAnchorType::Map };
PaintProperty<std::string, Faded<std::string>> fillPattern { "" };
PaintProperty<std::string, CrossFadedFunctionEvaluator> fillPattern { "" };
};
class FillLayer : public StyleLayer {

4
src/mbgl/layer/line_layer.hpp
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@@ -25,8 +25,8 @@ public:
PaintProperty<float> lineGapWidth { 0 };
PaintProperty<float> lineBlur { 0 };
PaintProperty<float> lineOffset { 0 };
PaintProperty<std::vector<float>, Faded<std::vector<float>>> lineDasharray { {} };
PaintProperty<std::string, Faded<std::string>> linePattern { "" };
PaintProperty<std::vector<float>, CrossFadedFunctionEvaluator> lineDasharray { {} };
PaintProperty<std::string, CrossFadedFunctionEvaluator> linePattern { "" };
};
class LineLayer : public StyleLayer {

27
src/mbgl/style/function.hpp
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@@ -1,17 +1,11 @@
#ifndef MBGL_STYLE_FUNCTION
#define MBGL_STYLE_FUNCTION
#include <mbgl/style/types.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/optional.hpp>
#include <vector>
#include <utility>
namespace mbgl {
class StyleCalculationParameters;
template <typename T>
class Function {
public:
@@ -24,8 +18,6 @@ public:
explicit Function(const Stops& stops_, float base_)
: base(base_), stops(stops_) {}
T evaluate(const StyleCalculationParameters&) const;
float getBase() const { return base; }
const std::vector<std::pair<float, T>>& getStops() const { return stops; }
@@ -34,25 +26,6 @@ private:
std::vector<std::pair<float, T>> stops;
};
// Partial specialization for cross-faded properties (*-pattern, line-dasharray).
template <typename T>
class Function<Faded<T>> {
public:
using Stop = std::pair<float, T>;
using Stops = std::vector<Stop>;
explicit Function(const T& constant)
: stops({{ 0, constant }}) {}
explicit Function(const Stops& stops_)
: stops(stops_) {}
Faded<T> evaluate(const StyleCalculationParameters&) const;
private:
std::vector<std::pair<float, T>> stops;
};
} // namespace mbgl
#endif

45
src/mbgl/style/function.cpp → src/mbgl/style/function_evaluator.cpp
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@@ -1,4 +1,4 @@
#include <mbgl/style/function.hpp>
#include <mbgl/style/function_evaluator.hpp>
#include <mbgl/style/style_calculation_parameters.hpp>
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/chrono.hpp>
@@ -29,7 +29,9 @@ template <> inline TextTransformType defaultStopsValue() { return {}; };
template <> inline RotationAlignmentType defaultStopsValue() { return {}; };
template <typename T>
T Function<T>::evaluate(const StyleCalculationParameters& parameters) const {
T NormalFunctionEvaluator<T>::operator()(const Function<T>& fn, const StyleCalculationParameters& parameters) const {
float base = fn.getBase();
const std::vector<std::pair<float, T>>& stops = fn.getStops();
float z = parameters.z;
bool smaller = false;
float smaller_z = 0.0f;
@@ -76,23 +78,23 @@ T Function<T>::evaluate(const StyleCalculationParameters& parameters) const {
}
}
template class Function<bool>;
template class Function<float>;
template class Function<Color>;
template class Function<std::vector<float>>;
template class Function<std::vector<std::string>>;
template class Function<std::array<float, 2>>;
template class NormalFunctionEvaluator<bool>;
template class NormalFunctionEvaluator<float>;
template class NormalFunctionEvaluator<Color>;
template class NormalFunctionEvaluator<std::vector<float>>;
template class NormalFunctionEvaluator<std::vector<std::string>>;
template class NormalFunctionEvaluator<std::array<float, 2>>;
template class Function<std::string>;
template class Function<TranslateAnchorType>;
template class Function<RotateAnchorType>;
template class Function<LineCapType>;
template class Function<LineJoinType>;
template class Function<SymbolPlacementType>;
template class Function<TextAnchorType>;
template class Function<TextJustifyType>;
template class Function<TextTransformType>;
template class Function<RotationAlignmentType>;
template class NormalFunctionEvaluator<std::string>;
template class NormalFunctionEvaluator<TranslateAnchorType>;
template class NormalFunctionEvaluator<RotateAnchorType>;
template class NormalFunctionEvaluator<LineCapType>;
template class NormalFunctionEvaluator<LineJoinType>;
template class NormalFunctionEvaluator<SymbolPlacementType>;
template class NormalFunctionEvaluator<TextAnchorType>;
template class NormalFunctionEvaluator<TextJustifyType>;
template class NormalFunctionEvaluator<TextTransformType>;
template class NormalFunctionEvaluator<RotationAlignmentType>;
template <typename T>
inline size_t getBiggestStopLessThan(const std::vector<std::pair<float, T>>& stops, float z) {
@@ -105,9 +107,10 @@ inline size_t getBiggestStopLessThan(const std::vector<std::pair<float, T>>& sto
}
template <typename T>
Faded<T> Function<Faded<T>>::evaluate(const StyleCalculationParameters& parameters) const {
Faded<T> CrossFadedFunctionEvaluator<T>::operator()(const Function<T>& fn, const StyleCalculationParameters& parameters) const {
Faded<T> result;
const std::vector<std::pair<float, T>>& stops = fn.getStops();
float z = parameters.z;
const float fraction = z - std::floor(z);
std::chrono::duration<float> d = parameters.defaultFadeDuration;
@@ -136,7 +139,7 @@ Faded<T> Function<Faded<T>>::evaluate(const StyleCalculationParameters& paramete
return result;
}
template class Function<Faded<std::string>>;
template class Function<Faded<std::vector<float>>>;
template class CrossFadedFunctionEvaluator<std::string>;
template class CrossFadedFunctionEvaluator<std::vector<float>>;
} // namespace mbgl

38
src/mbgl/style/function_evaluator.hpp Normal file
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@@ -0,0 +1,38 @@
#ifndef MBGL_STYLE_FUNCTION_EVALUATOR
#define MBGL_STYLE_FUNCTION_EVALUATOR
#include <mbgl/style/function.hpp>
namespace mbgl {
class StyleCalculationParameters;
template <typename T>
class NormalFunctionEvaluator {
public:
using ResultType = T;
T operator()(const Function<T>&, const StyleCalculationParameters&) const;
};
template <typename T>
struct Faded {
Faded() = default;
Faded(const T& v) : to(v) {}
T from;
float fromScale = 0;
T to;
float toScale = 0;
float t = 0;
};
template <typename T>
class CrossFadedFunctionEvaluator {
public:
using ResultType = Faded<T>;
Faded<T> operator()(const Function<T>&, const StyleCalculationParameters&) const;
};
} // namespace mbgl
#endif

4
src/mbgl/style/layout_property.hpp
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@@ -3,6 +3,7 @@
#include <mbgl/style/property_parsing.hpp>
#include <mbgl/style/function.hpp>
#include <mbgl/style/function_evaluator.hpp>
#include <mbgl/util/rapidjson.hpp>
#include <utility>
@@ -22,7 +23,8 @@ public:
void calculate(const StyleCalculationParameters& parameters) {
if (parsedValue) {
value = (*parsedValue).evaluate(parameters);
NormalFunctionEvaluator<T> evaluator;
value = evaluator(*parsedValue, parameters);
}
}

9
src/mbgl/style/paint_property.hpp
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@@ -4,6 +4,7 @@
#include <mbgl/style/class_dictionary.hpp>
#include <mbgl/style/property_parsing.hpp>
#include <mbgl/style/function.hpp>
#include <mbgl/style/function_evaluator.hpp>
#include <mbgl/style/property_transition.hpp>
#include <mbgl/style/style_cascade_parameters.hpp>
#include <mbgl/style/style_calculation_parameters.hpp>
@@ -16,10 +17,11 @@
namespace mbgl {
template <typename T, typename Result = T>
template <class T, template <class S> class Evaluator = NormalFunctionEvaluator>
class PaintProperty {
public:
using Fn = Function<Result>;
using Fn = Function<T>;
using Result = typename Evaluator<T>::ResultType;
explicit PaintProperty(T fallbackValue)
: value(fallbackValue) {
@@ -114,7 +116,8 @@ public:
}
Result calculate(const StyleCalculationParameters& parameters) {
Result final = value.evaluate(parameters);
Evaluator<T> evaluator;
Result final = evaluator(value, parameters);
if (!prior) {
// No prior value.
return final;

46
src/mbgl/style/property_parsing.cpp
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@@ -363,50 +363,12 @@ template<> optional<Function<Color>> parseProperty(const char* name, const JSVal
return parseFunction<Color>(name, value);
}
template<> optional<Function<std::vector<float>>> parseProperty(const char* name, const JSValue& value) {
return parseFunction<std::vector<float>>(name, value);
}
template<> optional<Function<std::vector<std::string>>> parseProperty(const char* name, const JSValue& value) {
return parseFunction<std::vector<std::string>>(name, value);
}
template <typename T>
optional<Function<Faded<T>>> parseFadedFunction(const JSValue& value) {
if (!value.HasMember("stops")) {
Log::Warning(Event::ParseStyle, "function must specify a function type");
return {};
}
auto stops = parseStops<T>("", value["stops"]);
if (!stops) {
return {};
}
return Function<Faded<T>>(*stops);
}
template <>
optional<Function<Faded<std::vector<float>>>> parseProperty(const char* name, const JSValue& value) {
if (value.IsObject()) {
return parseFadedFunction<std::vector<float>>(value);
}
auto constant = parseProperty<std::vector<float>>(name, value);
if (!constant) {
return {};
}
return Function<Faded<std::vector<float>>>(*constant);
}
template <>
optional<Function<Faded<std::string>>> parseProperty(const char* name, const JSValue& value) {
if (value.IsObject()) {
return parseFadedFunction<std::string>(value);
}
auto constant = parseProperty<std::string>(name, value);
if (!constant) {
return {};
}
return Function<Faded<std::string>>(*constant);
}
} // namespace mbgl

1
src/mbgl/util/interpolate.hpp
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@@ -5,6 +5,7 @@
#include <vector>
#include <mbgl/style/types.hpp>
#include <mbgl/style/function_evaluator.hpp>
namespace mbgl {
namespace util {