[general] moving ios and android project under ./platform folder

benchmark/function/camera_function.benchmark.cpp

@@ -0,0 +1,61 @@
+#include <benchmark/benchmark.h>
+
+#include <mbgl/style/conversion/json.hpp>
+#include <mbgl/style/conversion/function.hpp>
+#include <mbgl/style/conversion/property_value.hpp>
+#include <mbgl/style/conversion_impl.hpp>
+
+using namespace mbgl;
+using namespace mbgl::style;
+
+static std::string createFunctionJSON(size_t stopCount) {
+    std::string stops = "[";
+    for (size_t i = 0; i < stopCount; i++) {
+        std::string value = std::to_string(24.0f / stopCount * i);
+        if (stops.size() > 1) stops += ",";
+        stops += "[" + value + ", " + value + "]";
+    }
+    stops += "]";
+    return R"({"type": "exponential", "base": 2,  "stops": )" + stops + "}";
+}
+
+static void Parse_CameraFunction(benchmark::State& state) {
+    size_t stopCount = state.range(0);
+    
+    while (state.KeepRunning()) {
+        conversion::Error error;
+        state.PauseTiming();
+        auto doc = createFunctionJSON(stopCount);
+        state.ResumeTiming();
+        optional<PropertyValue<float>> result = conversion::convertJSON<PropertyValue<float>>(doc, error, false, false);
+        if (!result) {
+            state.SkipWithError(error.message.c_str());
+        }
+    }
+    state.SetLabel(std::to_string(stopCount).c_str());
+}
+
+static void Evaluate_CameraFunction(benchmark::State& state) {
+    size_t stopCount = state.range(0);
+    auto doc = createFunctionJSON(stopCount);
+    conversion::Error error;
+    optional<PropertyValue<float>> function = conversion::convertJSON<PropertyValue<float>>(doc, error, false, false);
+    if (!function) {
+        state.SkipWithError(error.message.c_str());
+    }
+    
+    while(state.KeepRunning()) {
+        float z = 24.0f * static_cast<float>(rand() % 100) / 100;
+        function->asExpression().evaluate(z);
+    }
+    
+    state.SetLabel(std::to_string(stopCount).c_str());
+}
+
+BENCHMARK(Parse_CameraFunction)
+    ->Arg(1)->Arg(2)->Arg(4)->Arg(6)->Arg(8)->Arg(10)->Arg(12);
+
+BENCHMARK(Evaluate_CameraFunction)
+    ->Arg(1)->Arg(2)->Arg(4)->Arg(6)->Arg(8)->Arg(10)->Arg(12);
+
+