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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. ``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.
*/
#pragma once
#include <wtf/Condition.h>
#include <wtf/Function.h>
#include <wtf/Lock.h>
#include <wtf/RunLoop.h>
#include <wtf/TZoneMalloc.h>
namespace WebKit {
using PlatformDisplayID = uint32_t;
class DisplayVBlankMonitor {
WTF_MAKE_TZONE_ALLOCATED(DisplayVBlankMonitor);
public:
static std::unique_ptr<DisplayVBlankMonitor> create(PlatformDisplayID);
virtual ~DisplayVBlankMonitor();
enum class Type { Drm, Timer };
virtual Type type() const = 0;
unsigned refreshRate() const { return m_refreshRate; }
void start();
void stop();
bool isActive();
void invalidate();
void setHandler(Function<void()>&&);
protected:
explicit DisplayVBlankMonitor(unsigned);
virtual bool waitForVBlank() const = 0;
unsigned m_refreshRate;
private:
enum class State { Stop, Active, Failed, Invalid };
bool startThreadIfNeeded();
void destroyThreadTimerFired();
RefPtr<Thread> m_thread;
Lock m_lock;
Condition m_condition;
State m_state WTF_GUARDED_BY_LOCK(m_lock) { State::Stop };
Function<void()> m_handler;
RunLoop::Timer m_destroyThreadTimer;
};
} // namespace WebKit
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