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/*
* Copyright (C) 2023 Igalia S.L.
*
* 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 "DisplayLink.h"
#include "Logging.h"
#include <wtf/text/StringToIntegerConversion.h>
namespace WebKit {
using namespace WebCore;
void DisplayLink::platformInitialize()
{
// FIXME: We can get here with displayID == 0 (webkit.org/b/212120), in which case DisplayVBlankMonitor defaults to the main screen.
m_vblankMonitor = DisplayVBlankMonitor::create(m_displayID);
m_vblankMonitor->setHandler([this] {
m_fpsThrottleCallCounter++;
if (m_fpsThrottleCallCounter >= m_fpsThrottleRatio) {
notifyObserversDisplayDidRefresh();
m_fpsThrottleCallCounter = 0;
}
});
unsigned refreshRate = m_vblankMonitor->refreshRate();
m_displayNominalFramesPerSecond = refreshRate;
if (const char* envString = getenv("WEBKIT_DISPLAY_REFRESH_THROTTLE_FPS")) {
if (auto newValue = parseInteger<unsigned>(StringView::fromLatin1(envString))) {
// The throttle FPS must be non zero and a factor of the real display refresh rate
if (!*newValue)
WTFLogAlways("WEBKIT_DISPLAY_REFRESH_THROTTLE_FPS=%s rejected: cannot be zero", envString); // NOLINT
else if (refreshRate % *newValue)
WTFLogAlways("WEBKIT_DISPLAY_REFRESH_THROTTLE_FPS=%s rejected: not a factor of refresh rate %ufps (remainder %u)", envString, refreshRate, refreshRate % *newValue); // NOLINT
else
m_displayNominalFramesPerSecond = *newValue;
} else
WTFLogAlways("WEBKIT_DISPLAY_REFRESH_THROTTLE_FPS=%s rejected: not a positive integer", envString); // NOLINT
}
m_fpsThrottleRatio = refreshRate / m_displayNominalFramesPerSecond;
if (m_fpsThrottleRatio != 1)
RELEASE_LOG(DisplayLink, "[UI] DisplayLink is throttled down from %ufps to %ufps", refreshRate, m_displayNominalFramesPerSecond);
}
void DisplayLink::platformFinalize()
{
ASSERT(m_vblankMonitor);
m_vblankMonitor->invalidate();
}
bool DisplayLink::platformIsRunning() const
{
return m_vblankMonitor->isActive();
}
void DisplayLink::platformStart()
{
m_vblankMonitor->start();
}
void DisplayLink::platformStop()
{
m_vblankMonitor->stop();
}
} // namespace WebKit
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