mitkPerformanceCounter.h

/*=========================================================================

  Program:   3DMed
  Date:      $Date: 2014-02-25 18:30:00 +0800 $
  Version:   $Version: 4.6.0 $
  Copyright: MIPG, Institute of Automation, Chinese Academy of Sciences

=========================================================================*/

#ifndef _mitkPerformanceCounter_h
#define _mitkPerformanceCounter_h

#ifdef _WIN32
#include <windows.h>
class mitkPerformanceCounter
{
    double dfFreq ;
public:
    mitkPerformanceCounter()
    {
        LARGE_INTEGER litmp;
        QueryPerformanceFrequency(&litmp);
        dfFreq = (double)litmp.QuadPart/1000;
    }
    double GetTime()
    {
        LARGE_INTEGER litmp;
        QueryPerformanceCounter(&litmp);
        return (double)litmp.QuadPart/dfFreq;
    }
};

static mitkPerformanceCounter theCounter;

static inline double GetTime()
{
    return theCounter.GetTime();    
}

#else

#include <sys/time.h>
static inline double GetTime()
{
    struct timeval t_time;
    gettimeofday( &t_time, 0);
    return 1000.0 * t_time.tv_sec + 0.001 * t_time.tv_usec; 
}

#endif

class TimeAverager
{
public:
    TimeAverager()
    {
        totalTime=0.0;
        count=0;
        maxCount=50;
    }
    ~TimeAverager()
    {
    }
    void SetMaxCount(unsigned maxCount)
    {
        this->maxCount=maxCount;
    }
    void Start()
    {
        startTime=GetTime();
    }
    void Stop()
    {
        if (count==maxCount)
        {
            printf("MaxCount Reached!\n");
            totalTime=0.0;
            count=0;
        }
        totalTime+=GetTime()-startTime;
        count++;
    }
    double GetAverageTime()
    {
        return totalTime/(double)count;
    }

private:
    double startTime;
    double totalTime;
    unsigned count;
    unsigned maxCount;
};

#endif

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