2014-07-26 06:43:40 +00:00
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/*
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Copyright (C) 2013 Rainmeter Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef RM_COMMON_TIMER_H_
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#define RM_COMMON_TIMER_H_
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#include <Windows.h>
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// Performs timing using the high-resolution performance counter.
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class Timer
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{
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public:
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void Start()
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{
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QueryPerformanceCounter(&m_Start);
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}
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void Stop()
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{
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QueryPerformanceCounter(&m_Stop);
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}
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// Returns the elapsed time in milliseconds.
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double GetElapsed() const
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{
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static LARGE_INTEGER s_Frequency = []()
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{
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LARGE_INTEGER frequency;
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QueryPerformanceFrequency(&frequency);
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return frequency;
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} ();
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return (m_Stop.QuadPart - m_Start.QuadPart) * 1000.0 / s_Frequency.QuadPart;
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}
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private:
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LARGE_INTEGER m_Start;
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LARGE_INTEGER m_Stop;
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};
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#endif
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