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
TimerWindowWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)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
initializeOffScreenTimerWindow()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
setSharedTimerFiredFunction(void (* f)())83 void setSharedTimerFiredFunction(void (*f)())
84 {
85 sharedTimerFiredFunction = f;
86 }
87
88 #define USER_TIMER_MAXIMUM 0x7FFFFFFF
89 #define USER_TIMER_MINIMUM 0x0000000A
90
setSharedTimerFireTime(double fireTime)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
stopSharedTimer()114 void stopSharedTimer()
115 {
116 if (timerID == TimerIdAuto)
117 KillTimer(timerWindowHandle, TimerIdAuto);
118
119 timerID = TimerIdNone;
120 }
121
122 } // namespace WebCore
123