SurfaceFlinger: remove old DispSync implementation

        "RefreshRateOverlay.cpp",

        "RegionSamplingThread.cpp",

        "RenderArea.cpp",

        "Scheduler/DispSync.cpp",

        "Scheduler/DispSyncSource.cpp",

        "Scheduler/EventThread.cpp",

        "Scheduler/OneShotTimer.cpp",

    class Callback {

    public:

        Callback() = default;

        virtual ~Callback();

        virtual ~Callback() = default;

        virtual void onDispSyncEvent(nsecs_t when, nsecs_t expectedVSyncTimestamp) = 0;

    protected:

    };

    DispSync() = default;

    virtual ~DispSync();

    virtual ~DispSync() = default;

    virtual void reset() = 0;

    virtual bool addPresentFence(const std::shared_ptr<FenceTime>&) = 0;

    DispSync& operator=(DispSync const&) = delete;

};

namespace impl {

class DispSyncThread;

// DispSync maintains a model of the periodic hardware-based vsync events of a

// display and uses that model to execute period callbacks at specific phase

// offsets from the hardware vsync events.  The model is constructed by

// feeding consecutive hardware event timestamps to the DispSync object via

// the addResyncSample method.

//

// The model is validated using timestamps from Fence objects that are passed

// to the DispSync object via the addPresentFence method.  These fence

// timestamps should correspond to a hardware vsync event, but they need not

// be consecutive hardware vsync times.  If this method determines that the

// current model accurately represents the hardware event times it will return

// false to indicate that a resynchronization (via addResyncSample) is not

// needed.

class DispSync : public android::DispSync {

public:

    // hasSyncFramework specifies whether the platform supports present fences.

    DispSync(const char* name, bool hasSyncFramework);

    ~DispSync() override;

    // reset clears the resync samples and error value.

    void reset() override;

    // addPresentFence adds a fence for use in validating the current vsync

    // event model.  The fence need not be signaled at the time

    // addPresentFence is called.  When the fence does signal, its timestamp

    // should correspond to a hardware vsync event.  Unlike the

    // addResyncSample method, the timestamps of consecutive fences need not

    // correspond to consecutive hardware vsync events.

    //

    // This method should be called with the retire fence from each HWComposer

    // set call that affects the display.

    bool addPresentFence(const std::shared_ptr<FenceTime>& fenceTime) override;

    // The beginResync, addResyncSample, and endResync methods are used to re-

    // synchronize the DispSync's model to the hardware vsync events.  The re-

    // synchronization process involves first calling beginResync, then

    // calling addResyncSample with a sequence of consecutive hardware vsync

    // event timestamps, and finally calling endResync when addResyncSample

    // indicates that no more samples are needed by returning false.

    //

    // This resynchronization process should be performed whenever the display

    // is turned on (i.e. once immediately after it's turned on) and whenever

    // addPresentFence returns true indicating that the model has drifted away

    // from the hardware vsync events.

    void beginResync() override;

    // Adds a vsync sample to the dispsync model. The timestamp is the time

    // of the vsync event that fired. periodFlushed will return true if the

    // vsync period was detected to have changed to mPendingPeriod.

    //

    // This method will return true if more vsync samples are needed to lock

    // down the DispSync model, and false otherwise.

    // periodFlushed will be set to true if mPendingPeriod is flushed to

    // mIntendedPeriod, and false otherwise.

    bool addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,

                         bool* periodFlushed) override;

    void endResync() override;

    // The setPeriod method sets the vsync event model's period to a specific

    // value. This should be used to prime the model when a display is first

    // turned on, or when a refresh rate change is requested.

    void setPeriod(nsecs_t period) override;

    // The getPeriod method returns the current vsync period.

    nsecs_t getPeriod() override;

    // addEventListener registers a callback to be called repeatedly at the

    // given phase offset from the hardware vsync events.  The callback is

    // called from a separate thread and it should return reasonably quickly

    // (i.e. within a few hundred microseconds).

    // If the callback was previously registered, and the last clock time the

    // callback was invoked was known to the caller (e.g. via removeEventListener),

    // then the caller may pass that through to lastCallbackTime, so that

    // callbacks do not accidentally double-fire if they are unregistered and

    // reregistered in rapid succession.

    status_t addEventListener(const char* name, nsecs_t phase, Callback* callback,

                              nsecs_t lastCallbackTime) override;

    // removeEventListener removes an already-registered event callback.  Once

    // this method returns that callback will no longer be called by the

    // DispSync object.

    // outLastCallbackTime will contain the last time that the callback was invoked.

    // If the caller wishes to reregister the same callback, they should pass the

    // callback time back into lastCallbackTime (see addEventListener).

    status_t removeEventListener(Callback* callback, nsecs_t* outLastCallbackTime) override;

    // changePhaseOffset changes the phase offset of an already-registered event callback. The

    // method will make sure that there is no skipping or double-firing on the listener per frame,

    // even when changing the offsets multiple times.

    status_t changePhaseOffset(Callback* callback, nsecs_t phase) override;

    // computeNextRefresh computes when the next refresh is expected to begin.

    // The periodOffset value can be used to move forward or backward; an

    // offset of zero is the next refresh, -1 is the previous refresh, 1 is

    // the refresh after next. etc.

    nsecs_t computeNextRefresh(int periodOffset, nsecs_t now) const override;

    // In certain situations the present fences aren't a good indicator of vsync

    // time, e.g. when vr flinger is active, or simply aren't available,

    // e.g. when the sync framework isn't present. Use this method to toggle

    // whether or not DispSync ignores present fences. If present fences are

    // ignored, DispSync will always ask for hardware vsync events by returning

    // true from addPresentFence() and addResyncSample().

    void setIgnorePresentFences(bool ignore) override;

    // Determine the expected present time when a buffer acquired now will be displayed.

    nsecs_t expectedPresentTime(nsecs_t now);

    // dump appends human-readable debug info to the result string.

    void dump(std::string& result) const override;

private:

    void updateModelLocked();

    void updateErrorLocked();

    void resetLocked();

    void resetErrorLocked();

    enum { MAX_RESYNC_SAMPLES = 32 };

    enum { MIN_RESYNC_SAMPLES_FOR_UPDATE = 6 };

    enum { NUM_PRESENT_SAMPLES = 8 };

    enum { MAX_RESYNC_SAMPLES_WITHOUT_PRESENT = 4 };

    enum { ACCEPTABLE_ZERO_ERR_SAMPLES_COUNT = 64 };

    const char* const mName;

    // mPeriod is the computed period of the modeled vsync events in

    // nanoseconds.

    nsecs_t mPeriod;

    // mIntendedPeriod is the intended period of the modeled vsync events in

    // nanoseconds. Under ideal conditions this should be similar if not the

    // same as mPeriod, plus or minus an observed error.

    nsecs_t mIntendedPeriod = 0;

    // mPendingPeriod is the proposed period change in nanoseconds.

    // If mPendingPeriod differs from mPeriod and is nonzero, it will

    // be flushed to mPeriod when we detect that the hardware switched

    // vsync frequency.

    nsecs_t mPendingPeriod = 0;

    // mPhase is the phase offset of the modeled vsync events.  It is the

    // number of nanoseconds from time 0 to the first vsync event.

    nsecs_t mPhase;

    // mReferenceTime is the reference time of the modeled vsync events.

    // It is the nanosecond timestamp of the first vsync event after a resync.

    nsecs_t mReferenceTime;

    // mError is the computed model error.  It is based on the difference

    // between the estimated vsync event times and those observed in the

    // mPresentFences array.

    nsecs_t mError;

    // mZeroErrSamplesCount keeps track of how many times in a row there were

    // zero timestamps available in the mPresentFences array.

    // Used to check that we are able to calculate the model error.

    size_t mZeroErrSamplesCount;

    // Whether we have updated the vsync event model since the last resync.

    bool mModelUpdated;

    // These member variables are the state used during the resynchronization

    // process to store information about the hardware vsync event times used

    // to compute the model.

    nsecs_t mResyncSamples[MAX_RESYNC_SAMPLES] = {0};

    size_t mFirstResyncSample = 0;

    size_t mNumResyncSamples = 0;

    int mNumResyncSamplesSincePresent;

    // These member variables store information about the present fences used

    // to validate the currently computed model.

    std::shared_ptr<FenceTime> mPresentFences[NUM_PRESENT_SAMPLES]{FenceTime::NO_FENCE};

    size_t mPresentSampleOffset;

    // mThread is the thread from which all the callbacks are called.

    sp<DispSyncThread> mThread;

    // mMutex is used to protect access to all member variables.

    mutable Mutex mMutex;

    // Ignore present (retire) fences if the device doesn't have support for the

    // sync framework

    bool mIgnorePresentFences;

    std::unique_ptr<Callback> mZeroPhaseTracer;

    // Flag to turn on logging in systrace.

    bool mTraceDetailedInfo = false;

};

} // namespace impl

} // namespace android

                  {.supportKernelTimer = sysprop::support_kernel_idle_timer(false),

                   .useContentDetection = sysprop::use_content_detection_for_refresh_rate(false),

                   .useContentDetectionV2 =

                           base::GetBoolProperty("debug.sf.use_content_detection_v2"s, true),

                   // TODO(b/140302863): Remove this and use the vsync_reactor system.

                   .useVsyncPredictor = base::GetBoolProperty("debug.sf.vsync_reactor"s, true)}) {}

                           base::GetBoolProperty("debug.sf.use_content_detection_v2"s, true)}) {}

Scheduler::Scheduler(const scheduler::RefreshRateConfigs& configs, ISchedulerCallback& callback,

                     Options options)

}

Scheduler::VsyncSchedule Scheduler::createVsyncSchedule(Options options) {

    if (!options.useVsyncPredictor) {

        auto sync = std::make_unique<impl::DispSync>("SchedulerDispSync",

                                                     sysprop::running_without_sync_framework(true));

        return {std::move(sync), nullptr, nullptr};

    }

    auto clock = std::make_unique<scheduler::SystemClock>();

    auto tracker = createVSyncTracker();

    auto dispatch = createVSyncDispatch(*tracker);

        bool useContentDetection;

        // Whether to use improved content detection.

        bool useContentDetectionV2;

        // Whether to use improved DispSync implementation.

        bool useVsyncPredictor;

    };

    struct VsyncSchedule {