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/*
* Copyright (C) 2018-2021 Apple Inc. 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. AND ITS CONTRIBUTORS ``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 ITS 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 "WebDisplayRefreshMonitor.h"
#if HAVE(DISPLAY_LINK)
#include "Logging.h"
#include "WebProcess.h"
#include "WebProcessProxy.h"
#include "WebProcessProxyMessages.h"
#include <WebCore/AnimationFrameRate.h>
#include <WebCore/DisplayRefreshMonitor.h>
#include <wtf/text/TextStream.h>
#if PLATFORM(MAC)
#include <WebCore/RunLoopObserver.h>
#endif
namespace WebKit {
using namespace WebCore;
// Avoid repeated start/stop IPC when rescheduled inside the callback.
constexpr unsigned maxUnscheduledFireCount { 1 };
WebDisplayRefreshMonitor::WebDisplayRefreshMonitor(PlatformDisplayID displayID)
: DisplayRefreshMonitor(displayID)
, m_observerID(DisplayLinkObserverID::generate())
{
ASSERT(isMainRunLoop());
setMaxUnscheduledFireCount(maxUnscheduledFireCount);
}
WebDisplayRefreshMonitor::~WebDisplayRefreshMonitor()
{
// stop() should have been called.
ASSERT(!m_displayLinkIsActive);
}
#if PLATFORM(MAC)
void WebDisplayRefreshMonitor::dispatchDisplayDidRefresh(const DisplayUpdate& displayUpdate)
{
// FIXME: This will perturb displayUpdate.
if (!m_firstCallbackInCurrentRunloop) {
RELEASE_LOG(DisplayLink, "[Web] WebDisplayRefreshMonitor::dispatchDisplayDidRefresh() for display %u - m_firstCallbackInCurrentRunloop is false", displayID());
Locker locker { lock() };
setIsPreviousFrameDone(true);
return;
}
DisplayRefreshMonitor::dispatchDisplayDidRefresh(displayUpdate);
}
#endif
bool WebDisplayRefreshMonitor::startNotificationMechanism()
{
if (m_displayLinkIsActive)
return true;
LOG_WITH_STREAM(DisplayLink, stream << "[Web] WebDisplayRefreshMonitor::requestRefreshCallback for display " << displayID() << " - starting");
WebProcess::singleton().parentProcessConnection()->send(Messages::WebProcessProxy::StartDisplayLink(m_observerID, displayID(), maxClientPreferredFramesPerSecond().value_or(FullSpeedFramesPerSecond)), 0);
#if PLATFORM(MAC)
if (!m_runLoopObserver) {
// The RunLoopObserver repeats.
// FIXME: Double check whether the value of `DisplayRefreshMonitor` (1) is the appropriate runloop order here,
// and also whether we should be specifying `RunLoopObserver::Activity::Entry` when scheduling the observer below.
m_runLoopObserver = makeUnique<RunLoopObserver>(RunLoopObserver::WellKnownOrder::DisplayRefreshMonitor, [this] {
m_firstCallbackInCurrentRunloop = true;
});
}
m_runLoopObserver->schedule(CFRunLoopGetCurrent());
#endif
m_displayLinkIsActive = true;
return true;
}
void WebDisplayRefreshMonitor::stopNotificationMechanism()
{
if (!m_displayLinkIsActive)
return;
LOG_WITH_STREAM(DisplayLink, stream << "[Web] WebDisplayRefreshMonitor::requestRefreshCallback - stopping");
WebProcess::singleton().parentProcessConnection()->send(Messages::WebProcessProxy::StopDisplayLink(m_observerID, displayID()), 0);
#if PLATFORM(MAC)
m_runLoopObserver->invalidate();
#endif
m_displayLinkIsActive = false;
}
void WebDisplayRefreshMonitor::adjustPreferredFramesPerSecond(FramesPerSecond preferredFramesPerSecond)
{
LOG_WITH_STREAM(DisplayLink, stream << "[Web] WebDisplayRefreshMonitor::adjustPreferredFramesPerSecond for display link on display " << displayID() << " to " << preferredFramesPerSecond);
WebProcess::singleton().parentProcessConnection()->send(Messages::WebProcessProxy::SetDisplayLinkPreferredFramesPerSecond(m_observerID, displayID(), preferredFramesPerSecond), 0);
}
} // namespace WebKit
#endif // HAVE(DISPLAY_LINK)
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