1 /*
2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2008 Collabora, Ltd. All rights reserved.
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 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 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 "PluginMessageThrottlerWin.h"
29
30 #include "PluginView.h"
31 #include <wtf/ASCIICType.h>
32
33 using namespace WTF;
34
35 namespace WebCore {
36
37 static const double MessageThrottleTimeInterval = 0.001;
38
PluginMessageThrottlerWin(PluginView * pluginView)39 PluginMessageThrottlerWin::PluginMessageThrottlerWin(PluginView* pluginView)
40 : m_back(0), m_front(0)
41 , m_pluginView(pluginView)
42 , m_messageThrottleTimer(this, &PluginMessageThrottlerWin::messageThrottleTimerFired)
43 {
44 // Initialize the free list with our inline messages
45 for (unsigned i = 0; i < NumInlineMessages - 1; i++)
46 m_inlineMessages[i].next = &m_inlineMessages[i + 1];
47 m_inlineMessages[NumInlineMessages - 1].next = 0;
48 m_freeInlineMessages = &m_inlineMessages[0];
49 }
50
~PluginMessageThrottlerWin()51 PluginMessageThrottlerWin::~PluginMessageThrottlerWin()
52 {
53 PluginMessage* next;
54
55 for (PluginMessage* message = m_front; message; message = next) {
56 next = message->next;
57 freeMessage(message);
58 }
59 }
60
appendMessage(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)61 void PluginMessageThrottlerWin::appendMessage(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
62 {
63 PluginMessage* message = allocateMessage();
64
65 message->hWnd = hWnd;
66 message->msg = msg;
67 message->wParam = wParam;
68 message->lParam = lParam;
69 message->next = 0;
70
71 if (m_back)
72 m_back->next = message;
73 m_back = message;
74 if (!m_front)
75 m_front = message;
76
77 if (!m_messageThrottleTimer.isActive())
78 m_messageThrottleTimer.startOneShot(MessageThrottleTimeInterval);
79 }
80
messageThrottleTimerFired(Timer<PluginMessageThrottlerWin> *)81 void PluginMessageThrottlerWin::messageThrottleTimerFired(Timer<PluginMessageThrottlerWin>*)
82 {
83 PluginMessage* message = m_front;
84 m_front = m_front->next;
85 if (message == m_back)
86 m_back = 0;
87
88 ::CallWindowProc(m_pluginView->pluginWndProc(), message->hWnd, message->msg, message->wParam, message->lParam);
89
90 freeMessage(message);
91
92 if (m_front)
93 m_messageThrottleTimer.startOneShot(MessageThrottleTimeInterval);
94 }
95
allocateMessage()96 PluginMessage* PluginMessageThrottlerWin::allocateMessage()
97 {
98 PluginMessage *message;
99
100 if (m_freeInlineMessages) {
101 message = m_freeInlineMessages;
102 m_freeInlineMessages = message->next;
103 } else
104 message = new PluginMessage;
105
106 return message;
107 }
108
isInlineMessage(PluginMessage * message)109 bool PluginMessageThrottlerWin::isInlineMessage(PluginMessage* message)
110 {
111 return message >= &m_inlineMessages[0] && message <= &m_inlineMessages[NumInlineMessages - 1];
112 }
113
freeMessage(PluginMessage * message)114 void PluginMessageThrottlerWin::freeMessage(PluginMessage* message)
115 {
116 if (isInlineMessage(message)) {
117 message->next = m_freeInlineMessages;
118 m_freeInlineMessages = message;
119 } else
120 delete message;
121 }
122
123 } // namespace WebCore
124