MyGUI_Timer.cpp

Go to the documentation of this file.

/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#include "MyGUI_Precompiled.h"
#include "MyGUI_Timer.h"
 
#if MYGUI_COMPILER == MYGUI_COMPILER_MSVC
#   include <windows.h>
#   pragma comment(lib, "winmm.lib")
#else
#   include <sys/time.h>
#endif
 
namespace MyGUI
{
 
    Timer::Timer() :
        mTimeStart(0)
    {
    }
 
    void Timer::reset()
    {
        mTimeStart = getCurrentMilliseconds();
    }
 
    unsigned long Timer::getMilliseconds() const
    {
        return getCurrentMilliseconds() - mTimeStart;
    }
 
    unsigned long Timer::getCurrentMilliseconds() const
    {
#if MYGUI_COMPILER == MYGUI_COMPILER_MSVC
        /*
        We do this because clock() is not affected by timeBeginPeriod on Win32.
        QueryPerformanceCounter is a little overkill for the amount of precision that
        I consider acceptable. If someone submits a patch that replaces this code
        with QueryPerformanceCounter, I wouldn't complain. Until then, timeGetTime
        gets the results I'm after. -EMS
 
        See: http://www.geisswerks.com/ryan/FAQS/timing.html
        And: http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323&
        */
        return timeGetTime();
#else
        struct timeval now;
        gettimeofday(&now, nullptr);
        return (now.tv_sec) * 1000 + (now.tv_usec) / 1000;
        //return ( unsigned long )(( double )( clock() ) / (( double )CLOCKS_PER_SEC / 1000.0 ) );
#endif
    }
 
} // namespace MyGUI