1 /* 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2007-2008 Torch Mobile, Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 #include "SharedTimer.h" 29 30 #include "Page.h" 31 #include "SystemTime.h" 32 #include "WebCoreInstanceHandle.h" 33 #include "Widget.h" 34 #include <wtf/Assertions.h> 35 #include <wtf/CurrentTime.h> 36 #include <windows.h> 37 38 namespace WebCore { 39 40 enum { 41 TimerIdNone = 0, 42 TimerIdAuto, 43 TimerIdManual, 44 }; 45 static UINT timerID = TimerIdNone; 46 47 static void (*sharedTimerFiredFunction)(); 48 49 static HWND timerWindowHandle = 0; 50 const LPCWSTR kTimerWindowClassName = L"TimerWindowClass"; 51 52 LRESULT CALLBACK TimerWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 53 { 54 if (message == WM_TIMER) { 55 if (timerID != TimerIdNone) 56 sharedTimerFiredFunction(); 57 } else if (message == WM_USER) { 58 if (timerID = TimerIdManual) { 59 sharedTimerFiredFunction(); 60 PostMessage(hWnd, WM_USER, 0, 0); 61 } 62 } else 63 return DefWindowProc(hWnd, message, wParam, lParam); 64 65 return 0; 66 } 67 68 static void initializeOffScreenTimerWindow() 69 { 70 if (timerWindowHandle) 71 return; 72 73 WNDCLASS wcex = {0}; 74 wcex.lpfnWndProc = TimerWindowWndProc; 75 wcex.hInstance = WebCore::instanceHandle(); 76 wcex.lpszClassName = kTimerWindowClassName; 77 RegisterClass(&wcex); 78 79 timerWindowHandle = CreateWindow(kTimerWindowClassName, 0, 0, 80 CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, 0, 0, WebCore::instanceHandle(), 0); 81 } 82 83 void setSharedTimerFiredFunction(void (*f)()) 84 { 85 sharedTimerFiredFunction = f; 86 } 87 88 #define USER_TIMER_MAXIMUM 0x7FFFFFFF 89 #define USER_TIMER_MINIMUM 0x0000000A 90 91 void setSharedTimerFireTime(double fireTime) 92 { 93 ASSERT(sharedTimerFiredFunction); 94 95 double interval = (fireTime - currentTime()) * 1000.; 96 unsigned intervalInMS = interval < USER_TIMER_MINIMUM 97 ? USER_TIMER_MINIMUM 98 : interval > USER_TIMER_MAXIMUM 99 ? USER_TIMER_MAXIMUM 100 : static_cast<unsigned>(interval); 101 102 if (timerID == TimerIdAuto) { 103 KillTimer(timerWindowHandle, TimerIdAuto); 104 timerID = TimerIdNone; 105 } 106 107 initializeOffScreenTimerWindow(); 108 if (SetTimer(timerWindowHandle, TimerIdAuto, intervalInMS, 0)) 109 timerID = TimerIdAuto; 110 else if (timerID != TimerIdManual) 111 PostMessage(timerWindowHandle, WM_USER, 0, 0); 112 } 113 114 void stopSharedTimer() 115 { 116 if (timerID == TimerIdAuto) 117 KillTimer(timerWindowHandle, TimerIdAuto); 118 119 timerID = TimerIdNone; 120 } 121 122 } // namespace WebCore 123