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/*
* Copyright (C) 2006, 2007, 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2008 Collabora, Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PluginMessageThrottlerWin.h"
#include "PluginView.h"
#include <wtf/ASCIICType.h>
#include <wtf/CurrentTime.h>
using namespace WTF;
namespace WebCore {
// Set a timer to make sure we process any queued messages at least every 16ms.
// This value allows Flash 60 messages/second, which should be enough for video
// playback, and also gets us over the limit for kicking into high-resolution
// timer mode (see SharedTimerWin.cpp).
static const double MessageThrottleTimeInterval = 0.016;
// During a continuous stream of messages, process one every 5ms.
static const double MessageDirectProcessingInterval = 0.005;
PluginMessageThrottlerWin::PluginMessageThrottlerWin(PluginView* pluginView)
: m_pluginView(pluginView)
, m_back(0)
, m_front(0)
, m_messageThrottleTimer(this, &PluginMessageThrottlerWin::messageThrottleTimerFired)
, m_lastMessageTime(0)
{
// Initialize the free list with our inline messages
for (unsigned i = 0; i < NumInlineMessages - 1; i++)
m_inlineMessages[i].next = &m_inlineMessages[i + 1];
m_inlineMessages[NumInlineMessages - 1].next = 0;
m_freeInlineMessages = &m_inlineMessages[0];
}
PluginMessageThrottlerWin::~PluginMessageThrottlerWin()
{
PluginMessage* next;
for (PluginMessage* message = m_front; message; message = next) {
next = message->next;
freeMessage(message);
}
}
void PluginMessageThrottlerWin::appendMessage(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
PluginMessage* message = allocateMessage();
message->hWnd = hWnd;
message->msg = msg;
message->wParam = wParam;
message->lParam = lParam;
message->next = 0;
if (m_back)
m_back->next = message;
m_back = message;
if (!m_front)
m_front = message;
// If it has been more than MessageDirectProcessingInterval between throttled messages,
// go ahead and process a message directly.
double currentTime = WTF::currentTime();
if (currentTime - m_lastMessageTime > MessageDirectProcessingInterval) {
processQueuedMessage();
m_lastMessageTime = currentTime;
if (!m_front)
return;
}
if (!m_messageThrottleTimer.isActive())
m_messageThrottleTimer.startOneShot(MessageThrottleTimeInterval);
}
void PluginMessageThrottlerWin::processQueuedMessage()
{
PluginMessage* message = m_front;
m_front = m_front->next;
if (message == m_back)
m_back = 0;
// Protect the PluginView from destruction while calling its window proc.
// <rdar://problem/6930280>
RefPtr<PluginView> protect(m_pluginView);
::CallWindowProc(m_pluginView->pluginWndProc(), message->hWnd, message->msg, message->wParam, message->lParam);
freeMessage(message);
}
void PluginMessageThrottlerWin::messageThrottleTimerFired(Timer<PluginMessageThrottlerWin>*)
{
processQueuedMessage();
if (m_front)
m_messageThrottleTimer.startOneShot(MessageThrottleTimeInterval);
}
PluginMessage* PluginMessageThrottlerWin::allocateMessage()
{
PluginMessage *message;
if (m_freeInlineMessages) {
message = m_freeInlineMessages;
m_freeInlineMessages = message->next;
} else
message = new PluginMessage;
return message;
}
bool PluginMessageThrottlerWin::isInlineMessage(PluginMessage* message)
{
return message >= &m_inlineMessages[0] && message <= &m_inlineMessages[NumInlineMessages - 1];
}
void PluginMessageThrottlerWin::freeMessage(PluginMessage* message)
{
if (isInlineMessage(message)) {
message->next = m_freeInlineMessages;
m_freeInlineMessages = message;
} else
delete message;
}
} // namespace WebCore
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