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 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 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 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 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 // Protect the PluginView from destruction while calling its window proc. 89 // <rdar://problem/6930280> 90 RefPtr<PluginView> protect(m_pluginView); 91 ::CallWindowProc(m_pluginView->pluginWndProc(), message->hWnd, message->msg, message->wParam, message->lParam); 92 93 freeMessage(message); 94 95 if (m_front) 96 m_messageThrottleTimer.startOneShot(MessageThrottleTimeInterval); 97 } 98 99 PluginMessage* PluginMessageThrottlerWin::allocateMessage() 100 { 101 PluginMessage *message; 102 103 if (m_freeInlineMessages) { 104 message = m_freeInlineMessages; 105 m_freeInlineMessages = message->next; 106 } else 107 message = new PluginMessage; 108 109 return message; 110 } 111 112 bool PluginMessageThrottlerWin::isInlineMessage(PluginMessage* message) 113 { 114 return message >= &m_inlineMessages[0] && message <= &m_inlineMessages[NumInlineMessages - 1]; 115 } 116 117 void PluginMessageThrottlerWin::freeMessage(PluginMessage* message) 118 { 119 if (isInlineMessage(message)) { 120 message->next = m_freeInlineMessages; 121 m_freeInlineMessages = message; 122 } else 123 delete message; 124 } 125 126 } // namespace WebCore 127