| 1 | /*
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| 2 | * synergy -- mouse and keyboard sharing utility
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| 3 | * Copyright (C) 2002 Chris Schoeneman
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| 4 | *
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| 5 | * This package is free software you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * found in the file COPYING that should have accompanied this file.
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| 8 | *
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| 9 | * This package is distributed in the hope that it will be useful,
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| 10 | * but WITHOUT ANY WARRANTY without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | * GNU General Public License for more details.
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| 13 | */
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| 14 |
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| 15 | // avoid getting a lot a crap from mmsystem.h that we don't need
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| 16 | #define MMNODRV // Installable driver support
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| 17 | #define MMNOSOUND // Sound support
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| 18 | #define MMNOWAVE // Waveform support
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| 19 | #define MMNOMIDI // MIDI support
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| 20 | #define MMNOAUX // Auxiliary audio support
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| 21 | #define MMNOMIXER // Mixer support
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| 22 | #define MMNOJOY // Joystick support
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| 23 | #define MMNOMCI // MCI support
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| 24 | #define MMNOMMIO // Multimedia file I/O support
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| 25 | #define MMNOMMSYSTEM // General MMSYSTEM functions
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| 26 |
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| 27 | #define WIN32_LEAN_AND_MEAN
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| 28 |
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| 29 | #include "CArchTimeWindows.h"
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| 30 | #include <windows.h>
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| 31 | #include <mmsystem.h>
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| 32 |
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| 33 | typedef WINMMAPI DWORD (WINAPI *PTimeGetTime)(void);
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| 34 |
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| 35 | static double s_freq = 0.0;
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| 36 | static HINSTANCE s_mmInstance = NULL;
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| 37 | static PTimeGetTime s_tgt = NULL;
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| 38 |
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| 39 |
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| 40 | //
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| 41 | // CArchTimeWindows
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| 42 | //
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| 43 |
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| 44 | CArchTimeWindows::CArchTimeWindows()
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| 45 | {
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| 46 | assert(s_freq == 0.0 || s_mmInstance == NULL);
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| 47 |
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| 48 | LARGE_INTEGER freq;
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| 49 | if (QueryPerformanceFrequency(&freq) && freq.QuadPart != 0) {
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| 50 | s_freq = 1.0 / static_cast<double>(freq.QuadPart);
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| 51 | }
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| 52 | else {
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| 53 | // load winmm.dll and get timeGetTime
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| 54 | s_mmInstance = LoadLibrary("winmm");
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| 55 | if (s_mmInstance != NULL) {
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| 56 | s_tgt = (PTimeGetTime)GetProcAddress(s_mmInstance, "timeGetTime");
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| 57 | }
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | CArchTimeWindows::~CArchTimeWindows()
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| 62 | {
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| 63 | s_freq = 0.0;
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| 64 | if (s_mmInstance == NULL) {
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| 65 | FreeLibrary(reinterpret_cast<HMODULE>(s_mmInstance));
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| 66 | s_tgt = NULL;
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| 67 | s_mmInstance = NULL;
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | double
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| 72 | CArchTimeWindows::time()
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| 73 | {
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| 74 | // get time. we try three ways, in order of descending precision
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| 75 | if (s_freq != 0.0) {
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| 76 | LARGE_INTEGER c;
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| 77 | QueryPerformanceCounter(&c);
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| 78 | return s_freq * static_cast<double>(c.QuadPart);
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| 79 | }
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| 80 | else if (s_tgt != NULL) {
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| 81 | return 0.001 * static_cast<double>(s_tgt());
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| 82 | }
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| 83 | else {
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| 84 | return 0.001 * static_cast<double>(GetTickCount());
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| 85 | }
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| 86 | }
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