87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
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/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2002 Chris Schoeneman
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*
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* This package 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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* found in the file COPYING that should have accompanied this file.
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*
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* This package 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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*/
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// avoid getting a lot a crap from mmsystem.h that we don't need
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#define MMNODRV // Installable driver support
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#define MMNOSOUND // Sound support
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#define MMNOWAVE // Waveform support
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#define MMNOMIDI // MIDI support
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#define MMNOAUX // Auxiliary audio support
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#define MMNOMIXER // Mixer support
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#define MMNOJOY // Joystick support
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#define MMNOMCI // MCI support
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#define MMNOMMIO // Multimedia file I/O support
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#define MMNOMMSYSTEM // General MMSYSTEM functions
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#define WIN32_LEAN_AND_MEAN
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#include "CArchTimeWindows.h"
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#include <windows.h>
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#include <mmsystem.h>
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typedef WINMMAPI DWORD (WINAPI *PTimeGetTime)(void);
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static double s_freq = 0.0;
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static HINSTANCE s_mmInstance = NULL;
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static PTimeGetTime s_tgt = NULL;
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//
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// CArchTimeWindows
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//
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CArchTimeWindows::CArchTimeWindows()
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{
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assert(s_freq == 0.0 || s_mmInstance == NULL);
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LARGE_INTEGER freq;
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if (QueryPerformanceFrequency(&freq) && freq.QuadPart != 0) {
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s_freq = 1.0 / static_cast<double>(freq.QuadPart);
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}
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else {
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// load winmm.dll and get timeGetTime
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s_mmInstance = LoadLibrary("winmm");
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if (s_mmInstance != NULL) {
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s_tgt = (PTimeGetTime)GetProcAddress(s_mmInstance, "timeGetTime");
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}
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}
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}
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CArchTimeWindows::~CArchTimeWindows()
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{
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s_freq = 0.0;
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if (s_mmInstance == NULL) {
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FreeLibrary(reinterpret_cast<HMODULE>(s_mmInstance));
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s_tgt = NULL;
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s_mmInstance = NULL;
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}
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}
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double
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CArchTimeWindows::time()
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{
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// get time. we try three ways, in order of descending precision
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if (s_freq != 0.0) {
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LARGE_INTEGER c;
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QueryPerformanceCounter(&c);
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return s_freq * static_cast<double>(c.QuadPart);
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}
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else if (s_tgt != NULL) {
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return 0.001 * static_cast<double>(s_tgt());
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}
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else {
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return 0.001 * static_cast<double>(GetTickCount());
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}
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}
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