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      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