Timer.h

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// -                        Open3D: www.open3d.org                            -
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// The MIT License (MIT)
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// Copyright (c) 2018 www.open3d.org
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#pragma once

#include <string>

namespace open3d {
namespace utility {

class Timer {
public:
    Timer();
    ~Timer();

public:
    static double GetSystemTimeInMilliseconds();

public:
    void Start();
    void Stop();
    void Print(const std::string &timer_info) const;
    double GetDuration() const;

private:
    double start_time_in_milliseconds_;
    double end_time_in_milliseconds_;
};

class ScopeTimer : public Timer {
public:
    ScopeTimer(const std::string &scope_timer_info = "");
    ~ScopeTimer();

private:
    std::string scope_timer_info_;
};

class FPSTimer : public Timer {
public:
    FPSTimer(const std::string &fps_timer_info = "",
             int expectation = -1,
             double time_to_print = 3000.0,
             int events_to_print = 100);

    void Signal();

private:
    std::string fps_timer_info_;
    int expectation_;
    double time_to_print_;
    int events_to_print_;
    int event_fragment_count_;
    int event_total_count_;
};

}  // namespace utility
}  // namespace open3d