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/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef WIN_UTILS_H
#define WIN_UTILS_H
#include <stdint.h>
namespace PBD {
namespace MMTIMERS {
/**
* Set the minimum Multimedia Timer resolution as supported by the system
* @return true if min timer resolution was successfully set
*
* Call reset_resolution to restore old timer resolution
*/
bool set_min_resolution ();
/**
* Get current Multimedia Timer resolution
* @return true if getting the timer value was successful
*/
bool get_resolution(uint32_t& timer_resolution_us);
/**
* Set current Multimedia Timer resolution
* @return true if setting the timer value was successful
*/
bool set_resolution(uint32_t timer_resolution_us);
/**
* Reset the Multimedia Timer back to what it was originally before
* setting the timer resolution.
*/
bool reset_resolution ();
} // namespace MMTIMERS
namespace QPC {
/**
* @return true if QueryPerformanceCounter is usable as a timer source
*/
bool get_timer_valid ();
/**
* @return the value of the performance counter converted to microseconds
*
* If get_counter_valid returns true then get_microseconds will always
* return a positive value. If QPC is not supported(OS < XP) then -1 is
* returned but the MS docs say that this won't occur for systems >= XP.
*/
int64_t get_microseconds ();
} // namespace QPC
/**
* The highest resolution timer source provided by the system. On Vista and
* above this is the value returned by QueryPerformanceCounter(QPC). On XP,
* this will QPC if supported or otherwise g_get_monotonic_time will be used.
*
* @return A timer value in microseconds or -1 in the event that the reading
* the timer source fails.
*/
int64_t get_microseconds ();
} // namespace PBD
#endif // WIN_UTILS_H
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