xref: /frameworks/base/services/core/java/com/android/server/display/DisplayPowerController.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server.display;

import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.UserIdInt;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ParceledListSlice;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.hardware.display.AmbientBrightnessDayStats;
import android.hardware.display.BrightnessChangeEvent;
import android.hardware.display.BrightnessConfiguration;
import android.hardware.display.BrightnessInfo;
import android.hardware.display.DisplayManagerInternal.DisplayPowerCallbacks;
import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest;
import android.metrics.LogMaker;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.Trace;
import android.os.UserHandle;
import android.provider.Settings;
import android.util.FloatProperty;
import android.util.Log;
import android.util.MathUtils;
import android.util.MutableFloat;
import android.util.MutableInt;
import android.util.Slog;
import android.util.SparseArray;
import android.util.TimeUtils;
import android.view.Display;

import com.android.internal.R;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.IBatteryStats;
import com.android.internal.display.BrightnessSynchronizer;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.internal.util.FrameworkStatsLog;
import com.android.internal.util.RingBuffer;
import com.android.server.LocalServices;
import com.android.server.am.BatteryStatsService;
import com.android.server.display.RampAnimator.DualRampAnimator;
import com.android.server.display.brightness.BrightnessEvent;
import com.android.server.display.brightness.BrightnessReason;
import com.android.server.display.color.ColorDisplayService.ColorDisplayServiceInternal;
import com.android.server.display.color.ColorDisplayService.ReduceBrightColorsListener;
import com.android.server.display.layout.Layout;
import com.android.server.display.utils.SensorUtils;
import com.android.server.display.whitebalance.DisplayWhiteBalanceController;
import com.android.server.display.whitebalance.DisplayWhiteBalanceFactory;
import com.android.server.display.whitebalance.DisplayWhiteBalanceSettings;
import com.android.server.policy.WindowManagerPolicy;

import java.io.PrintWriter;
import java.util.Objects;

/**
 * Controls the power state of the display.
 *
 * Handles the proximity sensor, light sensor, and animations between states
 * including the screen off animation.
 *
 * This component acts independently of the rest of the power manager service.
 * In particular, it does not share any state and it only communicates
 * via asynchronous callbacks to inform the power manager that something has
 * changed.
 *
 * Everything this class does internally is serialized on its handler although
 * it may be accessed by other threads from the outside.
 *
 * Note that the power manager service guarantees that it will hold a suspend
 * blocker as long as the display is not ready.  So most of the work done here
 * does not need to worry about holding a suspend blocker unless it happens
 * independently of the display ready signal.
 *
 * For debugging, you can make the color fade and brightness animations run
 * slower by changing the "animator duration scale" option in Development Settings.
 */
final class DisplayPowerController implements AutomaticBrightnessController.Callbacks,
        DisplayWhiteBalanceController.Callbacks, DisplayPowerControllerInterface {
    private static final String SCREEN_ON_BLOCKED_TRACE_NAME = "Screen on blocked";
    private static final String SCREEN_OFF_BLOCKED_TRACE_NAME = "Screen off blocked";

    private static final boolean DEBUG = false;
    private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false;

    // If true, uses the color fade on animation.
    // We might want to turn this off if we cannot get a guarantee that the screen
    // actually turns on and starts showing new content after the call to set the
    // screen state returns.  Playing the animation can also be somewhat slow.
    private static final boolean USE_COLOR_FADE_ON_ANIMATION = false;

    private static final float SCREEN_ANIMATION_RATE_MINIMUM = 0.0f;

    private static final int COLOR_FADE_ON_ANIMATION_DURATION_MILLIS = 250;
    private static final int COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS = 400;

    private static final int MSG_UPDATE_POWER_STATE = 1;
    private static final int MSG_PROXIMITY_SENSOR_DEBOUNCED = 2;
    private static final int MSG_SCREEN_ON_UNBLOCKED = 3;
    private static final int MSG_SCREEN_OFF_UNBLOCKED = 4;
    private static final int MSG_CONFIGURE_BRIGHTNESS = 5;
    private static final int MSG_SET_TEMPORARY_BRIGHTNESS = 6;
    private static final int MSG_SET_TEMPORARY_AUTO_BRIGHTNESS_ADJUSTMENT = 7;
    private static final int MSG_IGNORE_PROXIMITY = 8;
    private static final int MSG_STOP = 9;
    private static final int MSG_UPDATE_BRIGHTNESS = 10;
    private static final int MSG_UPDATE_RBC = 11;
    private static final int MSG_BRIGHTNESS_RAMP_DONE = 12;
    private static final int MSG_STATSD_HBM_BRIGHTNESS = 13;
    private static final int MSG_SWITCH_USER = 14;
    private static final int MSG_BOOT_COMPLETED = 15;
    private static final int MSG_SET_DWBC_STRONG_MODE = 16;
    private static final int MSG_SET_DWBC_COLOR_OVERRIDE = 17;
    private static final int MSG_SET_DWBC_LOGGING_ENABLED = 18;

    private static final int PROXIMITY_UNKNOWN = -1;
    private static final int PROXIMITY_NEGATIVE = 0;
    private static final int PROXIMITY_POSITIVE = 1;

    // Proximity sensor debounce delay in milliseconds for positive or negative transitions.
    private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0;
    private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250;

    private static final int BRIGHTNESS_CHANGE_STATSD_REPORT_INTERVAL_MS = 500;

    // Trigger proximity if distance is less than 5 cm.
    private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f;

    // State machine constants for tracking initial brightness ramp skipping when enabled.
    private static final int RAMP_STATE_SKIP_NONE = 0;
    private static final int RAMP_STATE_SKIP_INITIAL = 1;
    private static final int RAMP_STATE_SKIP_AUTOBRIGHT = 2;

    private static final int REPORTED_TO_POLICY_UNREPORTED = -1;
    private static final int REPORTED_TO_POLICY_SCREEN_OFF = 0;
    private static final int REPORTED_TO_POLICY_SCREEN_TURNING_ON = 1;
    private static final int REPORTED_TO_POLICY_SCREEN_ON = 2;
    private static final int REPORTED_TO_POLICY_SCREEN_TURNING_OFF = 3;

    private static final int RINGBUFFER_MAX = 100;

    private static final float[] BRIGHTNESS_RANGE_BOUNDARIES = {
        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80,
        90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1200,
        1400, 1600, 1800, 2000, 2250, 2500, 2750, 3000};
    private static final int[] BRIGHTNESS_RANGE_INDEX = {
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_UNKNOWN,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_0_1,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1_2,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_2_3,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_3_4,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_4_5,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_5_6,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_6_7,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_7_8,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_8_9,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_9_10,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_10_20,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_20_30,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_30_40,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_40_50,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_50_60,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_60_70,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_70_80,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_80_90,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_90_100,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_100_200,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_200_300,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_300_400,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_400_500,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_500_600,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_600_700,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_700_800,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_800_900,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_900_1000,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1000_1200,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1200_1400,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1400_1600,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1600_1800,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_1800_2000,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_2000_2250,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_2250_2500,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_2500_2750,
        FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_2750_3000,
    };

    private final String mTag;

    private final Object mLock = new Object();

    private final Context mContext;

    // Our handler.
    private final DisplayControllerHandler mHandler;

    // Asynchronous callbacks into the power manager service.
    // Only invoked from the handler thread while no locks are held.
    private final DisplayPowerCallbacks mCallbacks;

    // Battery stats.
    @Nullable
    private final IBatteryStats mBatteryStats;

    // The sensor manager.
    private final SensorManager mSensorManager;

    // The window manager policy.
    private final WindowManagerPolicy mWindowManagerPolicy;

    // The display blanker.
    private final DisplayBlanker mBlanker;

    // The LogicalDisplay tied to this DisplayPowerController.
    private final LogicalDisplay mLogicalDisplay;

    // The ID of the LogicalDisplay tied to this DisplayPowerController.
    private final int mDisplayId;

    // The ID of the display which this display follows for brightness purposes.
    private int mLeadDisplayId = Layout.NO_LEAD_DISPLAY;

    // The unique ID of the primary display device currently tied to this logical display
    private String mUniqueDisplayId;

    // Tracker for brightness changes.
    @Nullable
    private final BrightnessTracker mBrightnessTracker;

    // Tracker for brightness settings changes.
    private final SettingsObserver mSettingsObserver;

    // The proximity sensor, or null if not available or needed.
    private Sensor mProximitySensor;

    // The doze screen brightness.
    private final float mScreenBrightnessDozeConfig;

    // The dim screen brightness.
    private final float mScreenBrightnessDimConfig;

    // The minimum dim amount to use if the screen brightness is already below
    // mScreenBrightnessDimConfig.
    private final float mScreenBrightnessMinimumDimAmount;

    private final float mScreenBrightnessDefault;

    // True if auto-brightness should be used.
    private boolean mUseSoftwareAutoBrightnessConfig;

    // True if should use light sensor to automatically determine doze screen brightness.
    private final boolean mAllowAutoBrightnessWhileDozingConfig;

    // True if we want to persist the brightness value in nits even if the underlying display
    // device changes.
    private final boolean mPersistBrightnessNitsForDefaultDisplay;

    // True if the brightness config has changed and the short-term model needs to be reset
    private boolean mShouldResetShortTermModel;

    // Whether or not the color fade on screen on / off is enabled.
    private final boolean mColorFadeEnabled;

    @GuardedBy("mCachedBrightnessInfo")
    private final CachedBrightnessInfo mCachedBrightnessInfo = new CachedBrightnessInfo();

    private DisplayDevice mDisplayDevice;

    // True if we should fade the screen while turning it off, false if we should play
    // a stylish color fade animation instead.
    private final boolean mColorFadeFadesConfig;

    // True if we need to fake a transition to off when coming out of a doze state.
    // Some display hardware will blank itself when coming out of doze in order to hide
    // artifacts. For these displays we fake a transition into OFF so that policy can appropriately
    // blank itself and begin an appropriate power on animation.
    private final boolean mDisplayBlanksAfterDozeConfig;

    // True if there are only buckets of brightness values when the display is in the doze state,
    // rather than a full range of values. If this is true, then we'll avoid animating the screen
    // brightness since it'd likely be multiple jarring brightness transitions instead of just one
    // to reach the final state.
    private final boolean mBrightnessBucketsInDozeConfig;

    private final Clock mClock;
    private final Injector mInjector;

    //  Maximum time a ramp animation can take.
    private long mBrightnessRampIncreaseMaxTimeMillis;
    private long mBrightnessRampDecreaseMaxTimeMillis;

    // The pending power request.
    // Initially null until the first call to requestPowerState.
    @GuardedBy("mLock")
    private DisplayPowerRequest mPendingRequestLocked;

    // True if a request has been made to wait for the proximity sensor to go negative.
    @GuardedBy("mLock")
    private boolean mPendingWaitForNegativeProximityLocked;

    // True if the pending power request or wait for negative proximity flag
    // has been changed since the last update occurred.
    @GuardedBy("mLock")
    private boolean mPendingRequestChangedLocked;

    // Set to true when the important parts of the pending power request have been applied.
    // The important parts are mainly the screen state.  Brightness changes may occur
    // concurrently.
    @GuardedBy("mLock")
    private boolean mDisplayReadyLocked;

    // Set to true if a power state update is required.
    @GuardedBy("mLock")
    private boolean mPendingUpdatePowerStateLocked;

    /* The following state must only be accessed by the handler thread. */

    // The currently requested power state.
    // The power controller will progressively update its internal state to match
    // the requested power state.  Initially null until the first update.
    private DisplayPowerRequest mPowerRequest;

    // The current power state.
    // Must only be accessed on the handler thread.
    private DisplayPowerState mPowerState;

    // True if the device should wait for negative proximity sensor before
    // waking up the screen.  This is set to false as soon as a negative
    // proximity sensor measurement is observed or when the device is forced to
    // go to sleep by the user.  While true, the screen remains off.
    private boolean mWaitingForNegativeProximity;

    // True if the device should not take into account the proximity sensor
    // until either the proximity sensor state changes, or there is no longer a
    // request to listen to proximity sensor.
    private boolean mIgnoreProximityUntilChanged;

    // The actual proximity sensor threshold value.
    private float mProximityThreshold;

    // Set to true if the proximity sensor listener has been registered
    // with the sensor manager.
    private boolean mProximitySensorEnabled;

    // The debounced proximity sensor state.
    private int mProximity = PROXIMITY_UNKNOWN;

    // The raw non-debounced proximity sensor state.
    private int mPendingProximity = PROXIMITY_UNKNOWN;
    private long mPendingProximityDebounceTime = -1; // -1 if fully debounced

    // True if the screen was turned off because of the proximity sensor.
    // When the screen turns on again, we report user activity to the power manager.
    private boolean mScreenOffBecauseOfProximity;

    // The currently active screen on unblocker.  This field is non-null whenever
    // we are waiting for a callback to release it and unblock the screen.
    private ScreenOnUnblocker mPendingScreenOnUnblocker;
    private ScreenOffUnblocker mPendingScreenOffUnblocker;

    // True if we were in the process of turning off the screen.
    // This allows us to recover more gracefully from situations where we abort
    // turning off the screen.
    private boolean mPendingScreenOff;

    // True if we have unfinished business and are holding a suspend blocker.
    private boolean mUnfinishedBusiness;

    // The elapsed real time when the screen on was blocked.
    private long mScreenOnBlockStartRealTime;
    private long mScreenOffBlockStartRealTime;

    // Screen state we reported to policy. Must be one of REPORTED_TO_POLICY_* fields.
    private int mReportedScreenStateToPolicy = REPORTED_TO_POLICY_UNREPORTED;

    // If the last recorded screen state was dozing or not.
    private boolean mDozing;

    // Remembers whether certain kinds of brightness adjustments
    // were recently applied so that we can decide how to transition.
    private boolean mAppliedAutoBrightness;
    private boolean mAppliedDimming;
    private boolean mAppliedLowPower;
    private boolean mAppliedScreenBrightnessOverride;
    private boolean mAppliedTemporaryBrightness;
    private boolean mAppliedTemporaryAutoBrightnessAdjustment;
    private boolean mAppliedBrightnessBoost;
    private boolean mAppliedThrottling;

    // Reason for which the brightness was last changed. See {@link BrightnessReason} for more
    // information.
    // At the time of this writing, this value is changed within updatePowerState() only, which is
    // limited to the thread used by DisplayControllerHandler.
    private final BrightnessReason mBrightnessReason = new BrightnessReason();
    private final BrightnessReason mBrightnessReasonTemp = new BrightnessReason();

    // Brightness animation ramp rates in brightness units per second
    private float mBrightnessRampRateFastDecrease;
    private float mBrightnessRampRateFastIncrease;
    private float mBrightnessRampRateSlowDecrease;
    private float mBrightnessRampRateSlowIncrease;

    // Report HBM brightness change to StatsD
    private int mDisplayStatsId;
    private float mLastStatsBrightness = PowerManager.BRIGHTNESS_MIN;

    // Whether or not to skip the initial brightness ramps into STATE_ON.
    private final boolean mSkipScreenOnBrightnessRamp;

    // Display white balance components.
    // Critical methods must be called on DPC handler thread.
    @Nullable
    private final DisplayWhiteBalanceSettings mDisplayWhiteBalanceSettings;
    @Nullable
    private final DisplayWhiteBalanceController mDisplayWhiteBalanceController;

    @Nullable
    private final ColorDisplayServiceInternal mCdsi;
    private float[] mNitsRange;

    private final BrightnessRangeController mBrightnessRangeController;

    @Nullable
    private final HighBrightnessModeMetadata mHighBrightnessModeMetadata;

    private final BrightnessThrottler mBrightnessThrottler;

    private final BrightnessSetting mBrightnessSetting;

    private final Runnable mOnBrightnessChangeRunnable;

    private final BrightnessEvent mLastBrightnessEvent;
    private final BrightnessEvent mTempBrightnessEvent;

    // Keeps a record of brightness changes for dumpsys.
    private RingBuffer<BrightnessEvent> mBrightnessEventRingBuffer;

    // A record of state for skipping brightness ramps.
    private int mSkipRampState = RAMP_STATE_SKIP_NONE;

    // The first autobrightness value set when entering RAMP_STATE_SKIP_INITIAL.
    private float mInitialAutoBrightness;

    // The controller for the automatic brightness level.
    @Nullable
    private AutomaticBrightnessController mAutomaticBrightnessController;

    // The controller for the sensor used to estimate ambient lux while the display is off.
    @Nullable
    private ScreenOffBrightnessSensorController mScreenOffBrightnessSensorController;

    private Sensor mLightSensor;
    private Sensor mScreenOffBrightnessSensor;

    // The mappers between ambient lux, display backlight values, and display brightness.
    // We will switch between the idle mapper and active mapper in AutomaticBrightnessController.
    // Mapper used for active (normal) screen brightness mode
    @Nullable
    private BrightnessMappingStrategy mInteractiveModeBrightnessMapper;
    // Mapper used for idle screen brightness mode
    @Nullable
    private BrightnessMappingStrategy mIdleModeBrightnessMapper;

    // The current brightness configuration.
    @Nullable
    private BrightnessConfiguration mBrightnessConfiguration;

    // The last brightness that was set by the user and not temporary. Set to
    // PowerManager.BRIGHTNESS_INVALID_FLOAT when a brightness has yet to be recorded.
    private float mLastUserSetScreenBrightness = Float.NaN;

    // The screen brightness setting has changed but not taken effect yet. If this is different
    // from the current screen brightness setting then this is coming from something other than us
    // and should be considered a user interaction.
    private float mPendingScreenBrightnessSetting;

    // The last observed screen brightness setting, either set by us or by the settings app on
    // behalf of the user.
    private float mCurrentScreenBrightnessSetting;

    // The temporary screen brightness. Typically set when a user is interacting with the
    // brightness slider but hasn't settled on a choice yet. Set to
    // PowerManager.BRIGHTNESS_INVALID_FLOAT when there's no temporary brightness set.
    private float mTemporaryScreenBrightness;

    // This brightness value is set in concurrent displays mode. It is the brightness value
    // of the lead display that this DPC should follow.
    private float mBrightnessToFollow;

    // Indicates whether we should ramp slowly to the brightness value to follow.
    private boolean mBrightnessToFollowSlowChange;

    // The last auto brightness adjustment that was set by the user and not temporary. Set to
    // Float.NaN when an auto-brightness adjustment hasn't been recorded yet.
    private float mAutoBrightnessAdjustment;

    // The pending auto brightness adjustment that will take effect on the next power state update.
    private float mPendingAutoBrightnessAdjustment;

    // The temporary auto brightness adjustment. Typically set when a user is interacting with the
    // adjustment slider but hasn't settled on a choice yet. Set to
    // PowerManager.BRIGHTNESS_INVALID_FLOAT when there's no temporary adjustment set.
    private float mTemporaryAutoBrightnessAdjustment;

    private boolean mUseAutoBrightness;

    private boolean mIsRbcActive;

    // Whether there's a callback to tell listeners the display has changed scheduled to run. When
    // true it implies a wakelock is being held to guarantee the update happens before we collapse
    // into suspend and so needs to be cleaned up if the thread is exiting.
    // Should only be accessed on the Handler thread.
    private boolean mOnStateChangedPending;

    // Count of proximity messages currently on this DPC's Handler. Used to keep track of how many
    // suspend blocker acquisitions are pending when shutting down this DPC.
    // Should only be accessed on the Handler thread.
    private int mOnProximityPositiveMessages;
    private int mOnProximityNegativeMessages;

    // Animators.
    private ObjectAnimator mColorFadeOnAnimator;
    private ObjectAnimator mColorFadeOffAnimator;
    private DualRampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator;
    private BrightnessSetting.BrightnessSettingListener mBrightnessSettingListener;

    // True if this DisplayPowerController has been stopped and should no longer be running.
    private boolean mStopped;

    private DisplayDeviceConfig mDisplayDeviceConfig;

    // Identifiers for suspend blocker acquisition requests
    private final String mSuspendBlockerIdUnfinishedBusiness;
    private final String mSuspendBlockerIdOnStateChanged;
    private final String mSuspendBlockerIdProxPositive;
    private final String mSuspendBlockerIdProxNegative;
    private final String mSuspendBlockerIdProxDebounce;

    private boolean mIsEnabled;
    private boolean mIsInTransition;
    private boolean mIsDisplayInternal;

    // The id of the thermal brightness throttling policy that should be used.
    private String mThermalBrightnessThrottlingDataId;

    // DPCs following the brightness of this DPC. This is used in concurrent displays mode - there
    // is one lead display, the additional displays follow the brightness value of the lead display.
    @GuardedBy("mLock")
    private final SparseArray<DisplayPowerControllerInterface> mDisplayBrightnessFollowers =
            new SparseArray<>();

    private boolean mBootCompleted;

    /**
     * Creates the display power controller.
     */
    DisplayPowerController(Context context, Injector injector,
            DisplayPowerCallbacks callbacks, Handler handler,
            SensorManager sensorManager, DisplayBlanker blanker, LogicalDisplay logicalDisplay,
            BrightnessTracker brightnessTracker, BrightnessSetting brightnessSetting,
            Runnable onBrightnessChangeRunnable, HighBrightnessModeMetadata hbmMetadata,
            boolean bootCompleted) {

        mInjector = injector != null ? injector : new Injector();
        mClock = mInjector.getClock();
        mLogicalDisplay = logicalDisplay;
        mDisplayId = mLogicalDisplay.getDisplayIdLocked();
        mTag = "DisplayPowerController[" + mDisplayId + "]";
        mHighBrightnessModeMetadata = hbmMetadata;
        mSuspendBlockerIdUnfinishedBusiness = getSuspendBlockerUnfinishedBusinessId(mDisplayId);
        mSuspendBlockerIdOnStateChanged = getSuspendBlockerOnStateChangedId(mDisplayId);
        mSuspendBlockerIdProxPositive = getSuspendBlockerProxPositiveId(mDisplayId);
        mSuspendBlockerIdProxNegative = getSuspendBlockerProxNegativeId(mDisplayId);
        mSuspendBlockerIdProxDebounce = getSuspendBlockerProxDebounceId(mDisplayId);

        mDisplayDevice = mLogicalDisplay.getPrimaryDisplayDeviceLocked();
        mUniqueDisplayId = logicalDisplay.getPrimaryDisplayDeviceLocked().getUniqueId();
        mDisplayStatsId = mUniqueDisplayId.hashCode();
        mIsEnabled = logicalDisplay.isEnabledLocked();
        mIsInTransition = logicalDisplay.isInTransitionLocked();
        mIsDisplayInternal = logicalDisplay.getPrimaryDisplayDeviceLocked()
                .getDisplayDeviceInfoLocked().type == Display.TYPE_INTERNAL;
        mHandler = new DisplayControllerHandler(handler.getLooper());
        mLastBrightnessEvent = new BrightnessEvent(mDisplayId);
        mTempBrightnessEvent = new BrightnessEvent(mDisplayId);
        mThermalBrightnessThrottlingDataId =
                logicalDisplay.getDisplayInfoLocked().thermalBrightnessThrottlingDataId;

        if (mDisplayId == Display.DEFAULT_DISPLAY) {
            mBatteryStats = BatteryStatsService.getService();
        } else {
            mBatteryStats = null;
        }

        mSettingsObserver = new SettingsObserver(mHandler);
        mCallbacks = callbacks;
        mSensorManager = sensorManager;
        mWindowManagerPolicy = LocalServices.getService(WindowManagerPolicy.class);
        mBlanker = blanker;
        mContext = context;
        mBrightnessTracker = brightnessTracker;
        // TODO: b/186428377 update brightness setting when display changes
        mBrightnessSetting = brightnessSetting;
        mOnBrightnessChangeRunnable = onBrightnessChangeRunnable;

        PowerManager pm = context.getSystemService(PowerManager.class);

        final Resources resources = context.getResources();

        // DOZE AND DIM SETTINGS
        mScreenBrightnessDozeConfig = clampAbsoluteBrightness(
                pm.getBrightnessConstraint(PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_DOZE));
        mScreenBrightnessDimConfig = clampAbsoluteBrightness(
                pm.getBrightnessConstraint(PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_DIM));
        mScreenBrightnessMinimumDimAmount = resources.getFloat(
                com.android.internal.R.dimen.config_screenBrightnessMinimumDimAmountFloat);


        // NORMAL SCREEN SETTINGS
        mScreenBrightnessDefault = clampAbsoluteBrightness(
                mLogicalDisplay.getDisplayInfoLocked().brightnessDefault);

        mAllowAutoBrightnessWhileDozingConfig = resources.getBoolean(
                com.android.internal.R.bool.config_allowAutoBrightnessWhileDozing);

        mPersistBrightnessNitsForDefaultDisplay = resources.getBoolean(
                com.android.internal.R.bool.config_persistBrightnessNitsForDefaultDisplay);

        mDisplayDeviceConfig = logicalDisplay.getPrimaryDisplayDeviceLocked()
                .getDisplayDeviceConfig();

        loadBrightnessRampRates();
        mSkipScreenOnBrightnessRamp = resources.getBoolean(
                com.android.internal.R.bool.config_skipScreenOnBrightnessRamp);
        Runnable modeChangeCallback = () -> {
            sendUpdatePowerState();
            postBrightnessChangeRunnable();
            // TODO(b/192258832): Switch the HBMChangeCallback to a listener pattern.
            if (mAutomaticBrightnessController != null) {
                mAutomaticBrightnessController.update();
            }
        };

        HighBrightnessModeController hbmController = createHbmControllerLocked(modeChangeCallback);

        mBrightnessRangeController = new BrightnessRangeController(hbmController,
                modeChangeCallback, mDisplayDeviceConfig, resources);

        mBrightnessThrottler = createBrightnessThrottlerLocked();

        // Seed the cached brightness
        saveBrightnessInfo(getScreenBrightnessSetting());

        DisplayWhiteBalanceSettings displayWhiteBalanceSettings = null;
        DisplayWhiteBalanceController displayWhiteBalanceController = null;
        if (mDisplayId == Display.DEFAULT_DISPLAY) {
            try {
                displayWhiteBalanceController = injector.getDisplayWhiteBalanceController(
                        mHandler, mSensorManager, resources);
                displayWhiteBalanceSettings = new DisplayWhiteBalanceSettings(mContext, mHandler);
                displayWhiteBalanceSettings.setCallbacks(this);
                displayWhiteBalanceController.setCallbacks(this);
            } catch (Exception e) {
                Slog.e(mTag, "failed to set up display white-balance: " + e);
            }
        }
        mDisplayWhiteBalanceSettings = displayWhiteBalanceSettings;
        mDisplayWhiteBalanceController = displayWhiteBalanceController;

        loadNitsRange(resources);

        if (mDisplayId == Display.DEFAULT_DISPLAY) {
            mCdsi = LocalServices.getService(ColorDisplayServiceInternal.class);
            boolean active = mCdsi.setReduceBrightColorsListener(new ReduceBrightColorsListener() {
                @Override
                public void onReduceBrightColorsActivationChanged(boolean activated,
                        boolean userInitiated) {
                    applyReduceBrightColorsSplineAdjustment();

                }

                @Override
                public void onReduceBrightColorsStrengthChanged(int strength) {
                    applyReduceBrightColorsSplineAdjustment();
                }
            });
            if (active) {
                applyReduceBrightColorsSplineAdjustment();
            }
        } else {
            mCdsi = null;
        }

        setUpAutoBrightness(resources, handler);

        mColorFadeEnabled = !ActivityManager.isLowRamDeviceStatic()
                && !resources.getBoolean(
                  com.android.internal.R.bool.config_displayColorFadeDisabled);
        mColorFadeFadesConfig = resources.getBoolean(
                com.android.internal.R.bool.config_animateScreenLights);

        mDisplayBlanksAfterDozeConfig = resources.getBoolean(
                com.android.internal.R.bool.config_displayBlanksAfterDoze);

        mBrightnessBucketsInDozeConfig = resources.getBoolean(
                com.android.internal.R.bool.config_displayBrightnessBucketsInDoze);

        loadProximitySensor();

        loadNitBasedBrightnessSetting();
        mBrightnessToFollow = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        mAutoBrightnessAdjustment = getAutoBrightnessAdjustmentSetting();
        mTemporaryScreenBrightness = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        mPendingScreenBrightnessSetting = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        mTemporaryAutoBrightnessAdjustment = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        mPendingAutoBrightnessAdjustment = PowerManager.BRIGHTNESS_INVALID_FLOAT;

        mBootCompleted = bootCompleted;
    }

    private void applyReduceBrightColorsSplineAdjustment() {
        mHandler.obtainMessage(MSG_UPDATE_RBC).sendToTarget();
        sendUpdatePowerState();
    }

    private void handleRbcChanged() {
        if (mAutomaticBrightnessController == null) {
            return;
        }
        if ((!mAutomaticBrightnessController.isInIdleMode()
                && mInteractiveModeBrightnessMapper == null)
                || (mAutomaticBrightnessController.isInIdleMode()
                && mIdleModeBrightnessMapper == null)) {
            Log.w(mTag, "No brightness mapping available to recalculate splines for this mode");
            return;
        }

        float[] adjustedNits = new float[mNitsRange.length];
        for (int i = 0; i < mNitsRange.length; i++) {
            adjustedNits[i] = mCdsi.getReduceBrightColorsAdjustedBrightnessNits(mNitsRange[i]);
        }
        mIsRbcActive = mCdsi.isReduceBrightColorsActivated();
        mAutomaticBrightnessController.recalculateSplines(mIsRbcActive, adjustedNits);
    }

    /**
     * Returns true if the proximity sensor screen-off function is available.
     */
    @Override
    public boolean isProximitySensorAvailable() {
        return mProximitySensor != null;
    }

    /**
     * Get the {@link BrightnessChangeEvent}s for the specified user.
     *
     * @param userId         userId to fetch data for
     * @param includePackage if false will null out the package name in events
     */
    @Nullable
    @Override
    public ParceledListSlice<BrightnessChangeEvent> getBrightnessEvents(
            @UserIdInt int userId, boolean includePackage) {
        if (mBrightnessTracker == null) {
            return null;
        }
        return mBrightnessTracker.getEvents(userId, includePackage);
    }

    @Override
    public void onSwitchUser(@UserIdInt int newUserId) {
        Message msg = mHandler.obtainMessage(MSG_SWITCH_USER, newUserId);
        mHandler.sendMessage(msg);
    }

    private void handleOnSwitchUser(@UserIdInt int newUserId) {
        handleSettingsChange(true /* userSwitch */);
        handleBrightnessModeChange();
        if (mBrightnessTracker != null) {
            mBrightnessTracker.onSwitchUser(newUserId);
        }
    }

    @Override
    public int getDisplayId() {
        return mDisplayId;
    }

    @Override
    public int getLeadDisplayId() {
        return mLeadDisplayId;
    }

    @Override
    public void setBrightnessToFollow(float leadDisplayBrightness, float nits, float ambientLux,
            boolean slowChange) {
        mBrightnessRangeController.onAmbientLuxChange(ambientLux);
        if (nits < 0) {
            mBrightnessToFollow = leadDisplayBrightness;
        } else {
            float brightness = convertToFloatScale(nits);
            if (isValidBrightnessValue(brightness)) {
                mBrightnessToFollow = brightness;
            } else {
                // The device does not support nits
                mBrightnessToFollow = leadDisplayBrightness;
            }
        }
        mBrightnessToFollowSlowChange = slowChange;
        sendUpdatePowerState();
    }

    @Override
    public void addDisplayBrightnessFollower(@NonNull DisplayPowerControllerInterface follower) {
        synchronized (mLock) {
            mDisplayBrightnessFollowers.append(follower.getDisplayId(), follower);
            sendUpdatePowerStateLocked();
        }
    }

    @Override
    public void removeDisplayBrightnessFollower(@NonNull DisplayPowerControllerInterface follower) {
        synchronized (mLock) {
            mDisplayBrightnessFollowers.remove(follower.getDisplayId());
            mHandler.postAtTime(() -> follower.setBrightnessToFollow(
                    PowerManager.BRIGHTNESS_INVALID_FLOAT, /* nits= */ -1,
                    /* ambientLux= */ 0, /* slowChange= */ false), mClock.uptimeMillis());
        }
    }

    @GuardedBy("mLock")
    private void clearDisplayBrightnessFollowersLocked() {
        for (int i = 0; i < mDisplayBrightnessFollowers.size(); i++) {
            DisplayPowerControllerInterface follower = mDisplayBrightnessFollowers.valueAt(i);
            mHandler.postAtTime(() -> follower.setBrightnessToFollow(
                    PowerManager.BRIGHTNESS_INVALID_FLOAT, /* nits= */ -1,
                    /* ambientLux= */ 0, /* slowChange= */ false), mClock.uptimeMillis());
        }
        mDisplayBrightnessFollowers.clear();
    }

    @Nullable
    @Override
    public ParceledListSlice<AmbientBrightnessDayStats> getAmbientBrightnessStats(
            @UserIdInt int userId) {
        if (mBrightnessTracker == null) {
            return null;
        }
        return mBrightnessTracker.getAmbientBrightnessStats(userId);
    }

    /**
     * Persist the brightness slider events and ambient brightness stats to disk.
     */
    @Override
    public void persistBrightnessTrackerState() {
        if (mBrightnessTracker != null) {
            mBrightnessTracker.persistBrightnessTrackerState();
        }
    }

    /**
     * Requests a new power state.
     * The controller makes a copy of the provided object and then
     * begins adjusting the power state to match what was requested.
     *
     * @param request                  The requested power state.
     * @param waitForNegativeProximity If true, issues a request to wait for
     *                                 negative proximity before turning the screen back on,
     *                                 assuming the screen
     *                                 was turned off by the proximity sensor.
     * @return True if display is ready, false if there are important changes that must
     * be made asynchronously (such as turning the screen on), in which case the caller
     * should grab a wake lock, watch for {@link DisplayPowerCallbacks#onStateChanged()}
     * then try the request again later until the state converges.
     */
    public boolean requestPowerState(DisplayPowerRequest request,
            boolean waitForNegativeProximity) {
        if (DEBUG) {
            Slog.d(mTag, "requestPowerState: "
                    + request + ", waitForNegativeProximity=" + waitForNegativeProximity);
        }

        synchronized (mLock) {
            if (mStopped) {
                return true;
            }

            boolean changed = false;

            if (waitForNegativeProximity
                    && !mPendingWaitForNegativeProximityLocked) {
                mPendingWaitForNegativeProximityLocked = true;
                changed = true;
            }

            if (mPendingRequestLocked == null) {
                mPendingRequestLocked = new DisplayPowerRequest(request);
                changed = true;
            } else if (!mPendingRequestLocked.equals(request)) {
                mPendingRequestLocked.copyFrom(request);
                changed = true;
            }

            if (changed) {
                mDisplayReadyLocked = false;
                if (!mPendingRequestChangedLocked) {
                    mPendingRequestChangedLocked = true;
                    sendUpdatePowerStateLocked();
                }
            }

            return mDisplayReadyLocked;
        }
    }

    @Override
    public BrightnessConfiguration getDefaultBrightnessConfiguration() {
        if (mAutomaticBrightnessController == null) {
            return null;
        }
        return mAutomaticBrightnessController.getDefaultConfig();
    }

    /**
     * Notified when the display is changed. We use this to apply any changes that might be needed
     * when displays get swapped on foldable devices.  For example, different brightness properties
     * of each display need to be properly reflected in AutomaticBrightnessController.
     *
     * Make sure DisplayManagerService.mSyncRoot is held when this is called
     */
    @Override
    public void onDisplayChanged(HighBrightnessModeMetadata hbmMetadata, int leadDisplayId) {
        mLeadDisplayId = leadDisplayId;
        final DisplayDevice device = mLogicalDisplay.getPrimaryDisplayDeviceLocked();
        if (device == null) {
            Slog.wtf(mTag, "Display Device is null in DisplayPowerController for display: "
                    + mLogicalDisplay.getDisplayIdLocked());
            return;
        }

        final String uniqueId = device.getUniqueId();
        final DisplayDeviceConfig config = device.getDisplayDeviceConfig();
        final IBinder token = device.getDisplayTokenLocked();
        final DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked();
        final boolean isEnabled = mLogicalDisplay.isEnabledLocked();
        final boolean isInTransition = mLogicalDisplay.isInTransitionLocked();
        final boolean isDisplayInternal = mLogicalDisplay.getPrimaryDisplayDeviceLocked() != null
                && mLogicalDisplay.getPrimaryDisplayDeviceLocked()
                .getDisplayDeviceInfoLocked().type == Display.TYPE_INTERNAL;
        final String thermalBrightnessThrottlingDataId =
                mLogicalDisplay.getDisplayInfoLocked().thermalBrightnessThrottlingDataId;
        mHandler.postAtTime(() -> {
            boolean changed = false;
            if (mDisplayDevice != device) {
                changed = true;
                mDisplayDevice = device;
                mUniqueDisplayId = uniqueId;
                mDisplayStatsId = mUniqueDisplayId.hashCode();
                mDisplayDeviceConfig = config;
                mThermalBrightnessThrottlingDataId = thermalBrightnessThrottlingDataId;
                loadFromDisplayDeviceConfig(token, info, hbmMetadata);
                loadNitBasedBrightnessSetting();

                /// Since the underlying display-device changed, we really don't know the
                // last command that was sent to change it's state. Let's assume it is unknown so
                // that we trigger a change immediately.
                mPowerState.resetScreenState();
            } else if (!Objects.equals(mThermalBrightnessThrottlingDataId,
                    thermalBrightnessThrottlingDataId)) {
                changed = true;
                mThermalBrightnessThrottlingDataId = thermalBrightnessThrottlingDataId;
                mBrightnessThrottler.loadThermalBrightnessThrottlingDataFromDisplayDeviceConfig(
                        config.getThermalBrightnessThrottlingDataMapByThrottlingId(),
                        mThermalBrightnessThrottlingDataId,
                        mUniqueDisplayId);
            }
            if (mIsEnabled != isEnabled || mIsInTransition != isInTransition) {
                changed = true;
                mIsEnabled = isEnabled;
                mIsInTransition = isInTransition;
            }
            mIsDisplayInternal = isDisplayInternal;
            if (changed) {
                updatePowerState();
            }
        }, mClock.uptimeMillis());
    }

    /**
     * Unregisters all listeners and interrupts all running threads; halting future work.
     *
     * This method should be called when the DisplayPowerController is no longer in use; i.e. when
     * the {@link #mDisplayId display} has been removed.
     */
    @Override
    public void stop() {
        synchronized (mLock) {
            clearDisplayBrightnessFollowersLocked();

            mStopped = true;
            Message msg = mHandler.obtainMessage(MSG_STOP);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());

            if (mAutomaticBrightnessController != null) {
                mAutomaticBrightnessController.stop();
            }

            if (mBrightnessSetting != null) {
                mBrightnessSetting.unregisterListener(mBrightnessSettingListener);
            }

            mContext.getContentResolver().unregisterContentObserver(mSettingsObserver);
        }
    }

    private void loadFromDisplayDeviceConfig(IBinder token, DisplayDeviceInfo info,
            HighBrightnessModeMetadata hbmMetadata) {
        // All properties that depend on the associated DisplayDevice and the DDC must be
        // updated here.
        loadBrightnessRampRates();
        loadProximitySensor();
        loadNitsRange(mContext.getResources());
        setUpAutoBrightness(mContext.getResources(), mHandler);
        reloadReduceBrightColours();
        if (mScreenBrightnessRampAnimator != null) {
            mScreenBrightnessRampAnimator.setAnimationTimeLimits(
                    mBrightnessRampIncreaseMaxTimeMillis,
                    mBrightnessRampDecreaseMaxTimeMillis);
        }
        mBrightnessRangeController.loadFromConfig(hbmMetadata, token, info, mDisplayDeviceConfig);
        mBrightnessThrottler.loadThermalBrightnessThrottlingDataFromDisplayDeviceConfig(
                mDisplayDeviceConfig.getThermalBrightnessThrottlingDataMapByThrottlingId(),
                mThermalBrightnessThrottlingDataId, mUniqueDisplayId);
    }

    private void sendUpdatePowerState() {
        synchronized (mLock) {
            sendUpdatePowerStateLocked();
        }
    }

    @GuardedBy("mLock")
    private void sendUpdatePowerStateLocked() {
        if (!mStopped && !mPendingUpdatePowerStateLocked) {
            mPendingUpdatePowerStateLocked = true;
            Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
        }
    }

    private void initialize(int displayState) {
        mPowerState = mInjector.getDisplayPowerState(mBlanker,
                mColorFadeEnabled ? new ColorFade(mDisplayId) : null, mDisplayId, displayState);

        if (mColorFadeEnabled) {
            mColorFadeOnAnimator = ObjectAnimator.ofFloat(
                    mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 0.0f, 1.0f);
            mColorFadeOnAnimator.setDuration(COLOR_FADE_ON_ANIMATION_DURATION_MILLIS);
            mColorFadeOnAnimator.addListener(mAnimatorListener);

            mColorFadeOffAnimator = ObjectAnimator.ofFloat(
                    mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 1.0f, 0.0f);
            mColorFadeOffAnimator.setDuration(COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS);
            mColorFadeOffAnimator.addListener(mAnimatorListener);
        }

        mScreenBrightnessRampAnimator = mInjector.getDualRampAnimator(mPowerState,
                DisplayPowerState.SCREEN_BRIGHTNESS_FLOAT,
                DisplayPowerState.SCREEN_SDR_BRIGHTNESS_FLOAT);
        mScreenBrightnessRampAnimator.setAnimationTimeLimits(
                mBrightnessRampIncreaseMaxTimeMillis,
                mBrightnessRampDecreaseMaxTimeMillis);
        mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener);

        noteScreenState(mPowerState.getScreenState());
        noteScreenBrightness(mPowerState.getScreenBrightness());

        // Initialize all of the brightness tracking state
        final float brightness = convertToAdjustedNits(mPowerState.getScreenBrightness());
        if (mBrightnessTracker != null && brightness >= PowerManager.BRIGHTNESS_MIN) {
            mBrightnessTracker.start(brightness);
        }
        mBrightnessSettingListener = brightnessValue -> {
            Message msg = mHandler.obtainMessage(MSG_UPDATE_BRIGHTNESS, brightnessValue);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
        };

        mBrightnessSetting.registerListener(mBrightnessSettingListener);
        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ),
                false /*notifyForDescendants*/, mSettingsObserver, UserHandle.USER_ALL);
        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE),
                false /*notifyForDescendants*/, mSettingsObserver, UserHandle.USER_ALL);
        handleBrightnessModeChange();
    }

    private void setUpAutoBrightness(Resources resources, Handler handler) {
        mUseSoftwareAutoBrightnessConfig = mDisplayDeviceConfig.isAutoBrightnessAvailable();

        if (!mUseSoftwareAutoBrightnessConfig) {
            return;
        }

        float userLux = BrightnessMappingStrategy.NO_USER_LUX;
        float userNits = -1;
        if (mInteractiveModeBrightnessMapper != null) {
            userLux = mInteractiveModeBrightnessMapper.getUserLux();
            float userBrightness = mInteractiveModeBrightnessMapper.getUserBrightness();
            userNits = mInteractiveModeBrightnessMapper.convertToNits(userBrightness);
        }

        final boolean isIdleScreenBrightnessEnabled = resources.getBoolean(
                R.bool.config_enableIdleScreenBrightnessMode);
        mInteractiveModeBrightnessMapper = mInjector.getInteractiveModeBrightnessMapper(resources,
                mDisplayDeviceConfig, mDisplayWhiteBalanceController);
        if (isIdleScreenBrightnessEnabled) {
            mIdleModeBrightnessMapper = BrightnessMappingStrategy.createForIdleMode(resources,
                    mDisplayDeviceConfig, mDisplayWhiteBalanceController);
        }

        if (mInteractiveModeBrightnessMapper != null) {
            final float dozeScaleFactor = resources.getFraction(
                    com.android.internal.R.fraction.config_screenAutoBrightnessDozeScaleFactor,
                    1, 1);

            // Ambient Lux - Active Mode Brightness Thresholds
            float[] ambientBrighteningThresholds =
                    mDisplayDeviceConfig.getAmbientBrighteningPercentages();
            float[] ambientDarkeningThresholds =
                    mDisplayDeviceConfig.getAmbientDarkeningPercentages();
            float[] ambientBrighteningLevels =
                    mDisplayDeviceConfig.getAmbientBrighteningLevels();
            float[] ambientDarkeningLevels =
                    mDisplayDeviceConfig.getAmbientDarkeningLevels();
            float ambientDarkeningMinThreshold =
                    mDisplayDeviceConfig.getAmbientLuxDarkeningMinThreshold();
            float ambientBrighteningMinThreshold =
                    mDisplayDeviceConfig.getAmbientLuxBrighteningMinThreshold();
            HysteresisLevels ambientBrightnessThresholds = mInjector.getHysteresisLevels(
                    ambientBrighteningThresholds, ambientDarkeningThresholds,
                    ambientBrighteningLevels, ambientDarkeningLevels, ambientDarkeningMinThreshold,
                    ambientBrighteningMinThreshold);

            // Display - Active Mode Brightness Thresholds
            float[] screenBrighteningThresholds =
                    mDisplayDeviceConfig.getScreenBrighteningPercentages();
            float[] screenDarkeningThresholds =
                    mDisplayDeviceConfig.getScreenDarkeningPercentages();
            float[] screenBrighteningLevels =
                    mDisplayDeviceConfig.getScreenBrighteningLevels();
            float[] screenDarkeningLevels =
                    mDisplayDeviceConfig.getScreenDarkeningLevels();
            float screenDarkeningMinThreshold =
                    mDisplayDeviceConfig.getScreenDarkeningMinThreshold();
            float screenBrighteningMinThreshold =
                    mDisplayDeviceConfig.getScreenBrighteningMinThreshold();
            HysteresisLevels screenBrightnessThresholds = mInjector.getHysteresisLevels(
                    screenBrighteningThresholds, screenDarkeningThresholds,
                    screenBrighteningLevels, screenDarkeningLevels, screenDarkeningMinThreshold,
                    screenBrighteningMinThreshold, true);

            // Ambient Lux - Idle Screen Brightness Thresholds
            float ambientDarkeningMinThresholdIdle =
                    mDisplayDeviceConfig.getAmbientLuxDarkeningMinThresholdIdle();
            float ambientBrighteningMinThresholdIdle =
                    mDisplayDeviceConfig.getAmbientLuxBrighteningMinThresholdIdle();
            float[] ambientBrighteningThresholdsIdle =
                    mDisplayDeviceConfig.getAmbientBrighteningPercentagesIdle();
            float[] ambientDarkeningThresholdsIdle =
                    mDisplayDeviceConfig.getAmbientDarkeningPercentagesIdle();
            float[] ambientBrighteningLevelsIdle =
                    mDisplayDeviceConfig.getAmbientBrighteningLevelsIdle();
            float[] ambientDarkeningLevelsIdle =
                    mDisplayDeviceConfig.getAmbientDarkeningLevelsIdle();
            HysteresisLevels ambientBrightnessThresholdsIdle = mInjector.getHysteresisLevels(
                    ambientBrighteningThresholdsIdle, ambientDarkeningThresholdsIdle,
                    ambientBrighteningLevelsIdle, ambientDarkeningLevelsIdle,
                    ambientDarkeningMinThresholdIdle, ambientBrighteningMinThresholdIdle);

            // Display - Idle Screen Brightness Thresholds
            float screenDarkeningMinThresholdIdle =
                    mDisplayDeviceConfig.getScreenDarkeningMinThresholdIdle();
            float screenBrighteningMinThresholdIdle =
                    mDisplayDeviceConfig.getScreenBrighteningMinThresholdIdle();
            float[] screenBrighteningThresholdsIdle =
                    mDisplayDeviceConfig.getScreenBrighteningPercentagesIdle();
            float[] screenDarkeningThresholdsIdle =
                    mDisplayDeviceConfig.getScreenDarkeningPercentagesIdle();
            float[] screenBrighteningLevelsIdle =
                    mDisplayDeviceConfig.getScreenBrighteningLevelsIdle();
            float[] screenDarkeningLevelsIdle =
                    mDisplayDeviceConfig.getScreenDarkeningLevelsIdle();
            HysteresisLevels screenBrightnessThresholdsIdle = mInjector.getHysteresisLevels(
                    screenBrighteningThresholdsIdle, screenDarkeningThresholdsIdle,
                    screenBrighteningLevelsIdle, screenDarkeningLevelsIdle,
                    screenDarkeningMinThresholdIdle, screenBrighteningMinThresholdIdle);

            long brighteningLightDebounce = mDisplayDeviceConfig
                    .getAutoBrightnessBrighteningLightDebounce();
            long darkeningLightDebounce = mDisplayDeviceConfig
                    .getAutoBrightnessDarkeningLightDebounce();
            boolean autoBrightnessResetAmbientLuxAfterWarmUp = resources.getBoolean(
                    com.android.internal.R.bool.config_autoBrightnessResetAmbientLuxAfterWarmUp);

            int lightSensorWarmUpTimeConfig = resources.getInteger(
                    com.android.internal.R.integer.config_lightSensorWarmupTime);
            int lightSensorRate = resources.getInteger(
                    com.android.internal.R.integer.config_autoBrightnessLightSensorRate);
            int initialLightSensorRate = resources.getInteger(
                    com.android.internal.R.integer.config_autoBrightnessInitialLightSensorRate);
            if (initialLightSensorRate == -1) {
                initialLightSensorRate = lightSensorRate;
            } else if (initialLightSensorRate > lightSensorRate) {
                Slog.w(mTag, "Expected config_autoBrightnessInitialLightSensorRate ("
                        + initialLightSensorRate + ") to be less than or equal to "
                        + "config_autoBrightnessLightSensorRate (" + lightSensorRate + ").");
            }

            loadAmbientLightSensor();
            // BrightnessTracker should only use one light sensor, we want to use the light sensor
            // from the default display and not e.g. temporary displays when switching layouts.
            if (mBrightnessTracker != null && mDisplayId == Display.DEFAULT_DISPLAY) {
                mBrightnessTracker.setLightSensor(mLightSensor);
            }

            if (mAutomaticBrightnessController != null) {
                mAutomaticBrightnessController.stop();
            }
            float userBrightness = BrightnessMappingStrategy.NO_USER_BRIGHTNESS;
            if (userNits >= 0) {
                userBrightness = mInteractiveModeBrightnessMapper.convertToFloatScale(userNits);
                if (Float.isNaN(userBrightness)) {
                    userBrightness = BrightnessMappingStrategy.NO_USER_BRIGHTNESS;
                }
            }
            mAutomaticBrightnessController = mInjector.getAutomaticBrightnessController(
                    this, handler.getLooper(), mSensorManager, mLightSensor,
                    mInteractiveModeBrightnessMapper, lightSensorWarmUpTimeConfig,
                    PowerManager.BRIGHTNESS_MIN, PowerManager.BRIGHTNESS_MAX, dozeScaleFactor,
                    lightSensorRate, initialLightSensorRate, brighteningLightDebounce,
                    darkeningLightDebounce, autoBrightnessResetAmbientLuxAfterWarmUp,
                    ambientBrightnessThresholds, screenBrightnessThresholds,
                    ambientBrightnessThresholdsIdle, screenBrightnessThresholdsIdle, mContext,
                    mBrightnessRangeController, mBrightnessThrottler, mIdleModeBrightnessMapper,
                    mDisplayDeviceConfig.getAmbientHorizonShort(),
                    mDisplayDeviceConfig.getAmbientHorizonLong(), userLux, userBrightness);

            mBrightnessEventRingBuffer =
                    new RingBuffer<>(BrightnessEvent.class, RINGBUFFER_MAX);

            if (mScreenOffBrightnessSensorController != null) {
                mScreenOffBrightnessSensorController.stop();
                mScreenOffBrightnessSensorController = null;
            }
            loadScreenOffBrightnessSensor();
            int[] sensorValueToLux = mDisplayDeviceConfig.getScreenOffBrightnessSensorValueToLux();
            if (mScreenOffBrightnessSensor != null && sensorValueToLux != null) {
                mScreenOffBrightnessSensorController =
                        mInjector.getScreenOffBrightnessSensorController(
                                mSensorManager,
                                mScreenOffBrightnessSensor,
                                mHandler,
                                SystemClock::uptimeMillis,
                                sensorValueToLux,
                                mInteractiveModeBrightnessMapper);
            }
        } else {
            mUseSoftwareAutoBrightnessConfig = false;
        }
    }

    private void loadBrightnessRampRates() {
        mBrightnessRampRateFastDecrease = mDisplayDeviceConfig.getBrightnessRampFastDecrease();
        mBrightnessRampRateFastIncrease = mDisplayDeviceConfig.getBrightnessRampFastIncrease();
        mBrightnessRampRateSlowDecrease = mDisplayDeviceConfig.getBrightnessRampSlowDecrease();
        mBrightnessRampRateSlowIncrease = mDisplayDeviceConfig.getBrightnessRampSlowIncrease();
        mBrightnessRampDecreaseMaxTimeMillis =
                mDisplayDeviceConfig.getBrightnessRampDecreaseMaxMillis();
        mBrightnessRampIncreaseMaxTimeMillis =
                mDisplayDeviceConfig.getBrightnessRampIncreaseMaxMillis();
    }

    private void loadNitsRange(Resources resources) {
        if (mDisplayDeviceConfig != null && mDisplayDeviceConfig.getNits() != null) {
            mNitsRange = mDisplayDeviceConfig.getNits();
        } else {
            Slog.w(mTag, "Screen brightness nits configuration is unavailable; falling back");
            mNitsRange = BrightnessMappingStrategy.getFloatArray(resources
                    .obtainTypedArray(com.android.internal.R.array.config_screenBrightnessNits));
        }
    }

    private void reloadReduceBrightColours() {
        if (mCdsi != null && mCdsi.isReduceBrightColorsActivated()) {
            applyReduceBrightColorsSplineAdjustment();
        }
    }

    @Override
    public void setAutomaticScreenBrightnessMode(boolean isIdle) {
        if (mAutomaticBrightnessController != null) {
            if (isIdle) {
                mAutomaticBrightnessController.switchToIdleMode();
            } else {
                mAutomaticBrightnessController.switchToInteractiveScreenBrightnessMode();
            }
        }

        Message msg = mHandler.obtainMessage();
        msg.what = MSG_SET_DWBC_STRONG_MODE;
        msg.arg1 = isIdle ? 1 : 0;
        mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
    }

    private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            sendUpdatePowerState();
        }

        @Override
        public void onAnimationRepeat(Animator animation) {
        }

        @Override
        public void onAnimationCancel(Animator animation) {
        }
    };

    private final RampAnimator.Listener mRampAnimatorListener = new RampAnimator.Listener() {
        @Override
        public void onAnimationEnd() {
            sendUpdatePowerState();
            Message msg = mHandler.obtainMessage(MSG_BRIGHTNESS_RAMP_DONE);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
        }
    };

    /** Clean up all resources that are accessed via the {@link #mHandler} thread. */
    private void cleanupHandlerThreadAfterStop() {
        setProximitySensorEnabled(false);
        mBrightnessRangeController.stop();
        mBrightnessThrottler.stop();
        mHandler.removeCallbacksAndMessages(null);

        // Release any outstanding wakelocks we're still holding because of pending messages.
        if (mUnfinishedBusiness) {
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdUnfinishedBusiness);
            mUnfinishedBusiness = false;
        }
        if (mOnStateChangedPending) {
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdOnStateChanged);
            mOnStateChangedPending = false;
        }
        for (int i = 0; i < mOnProximityPositiveMessages; i++) {
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdProxPositive);
        }
        mOnProximityPositiveMessages = 0;
        for (int i = 0; i < mOnProximityNegativeMessages; i++) {
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdProxNegative);
        }
        mOnProximityNegativeMessages = 0;

        final float brightness = mPowerState != null
                ? mPowerState.getScreenBrightness()
                : PowerManager.BRIGHTNESS_MIN;
        reportStats(brightness);

        if (mPowerState != null) {
            mPowerState.stop();
            mPowerState = null;
        }

        if (mScreenOffBrightnessSensorController != null) {
            mScreenOffBrightnessSensorController.stop();
        }

        if (mDisplayWhiteBalanceController != null) {
            mDisplayWhiteBalanceController.setEnabled(false);
        }
    }

    // Call from handler thread
    private void updatePowerState() {
        Trace.traceBegin(Trace.TRACE_TAG_POWER,
                "DisplayPowerController#updatePowerState");
        updatePowerStateInternal();
        Trace.traceEnd(Trace.TRACE_TAG_POWER);
    }

    private void updatePowerStateInternal() {
        // Update the power state request.
        final boolean mustNotify;
        final int previousPolicy;
        boolean mustInitialize = false;
        int brightnessAdjustmentFlags = 0;
        mBrightnessReasonTemp.set(null);
        mTempBrightnessEvent.reset();
        SparseArray<DisplayPowerControllerInterface> displayBrightnessFollowers;
        synchronized (mLock) {
            if (mStopped) {
                return;
            }
            mPendingUpdatePowerStateLocked = false;
            if (mPendingRequestLocked == null) {
                return; // wait until first actual power request
            }

            if (mPowerRequest == null) {
                mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked);
                updatePendingProximityRequestsLocked();
                mPendingRequestChangedLocked = false;
                mustInitialize = true;
                // Assume we're on and bright until told otherwise, since that's the state we turn
                // on in.
                previousPolicy = DisplayPowerRequest.POLICY_BRIGHT;
            } else if (mPendingRequestChangedLocked) {
                previousPolicy = mPowerRequest.policy;
                mPowerRequest.copyFrom(mPendingRequestLocked);
                updatePendingProximityRequestsLocked();
                mPendingRequestChangedLocked = false;
                mDisplayReadyLocked = false;
            } else {
                previousPolicy = mPowerRequest.policy;
            }

            mustNotify = !mDisplayReadyLocked;

            displayBrightnessFollowers = mDisplayBrightnessFollowers.clone();
        }

        // Compute the basic display state using the policy.
        // We might override this below based on other factors.
        // Initialise brightness as invalid.
        int state;
        float brightnessState = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        boolean performScreenOffTransition = false;
        switch (mPowerRequest.policy) {
            case DisplayPowerRequest.POLICY_OFF:
                state = Display.STATE_OFF;
                performScreenOffTransition = true;
                break;
            case DisplayPowerRequest.POLICY_DOZE:
                if (mPowerRequest.dozeScreenState != Display.STATE_UNKNOWN) {
                    state = mPowerRequest.dozeScreenState;
                } else {
                    state = Display.STATE_DOZE;
                }
                if (!mAllowAutoBrightnessWhileDozingConfig) {
                    brightnessState = mPowerRequest.dozeScreenBrightness;
                    mBrightnessReasonTemp.setReason(BrightnessReason.REASON_DOZE);
                }
                break;
            case DisplayPowerRequest.POLICY_DIM:
            case DisplayPowerRequest.POLICY_BRIGHT:
            default:
                state = Display.STATE_ON;
                break;
        }
        assert (state != Display.STATE_UNKNOWN);

        if (mScreenOffBrightnessSensorController != null) {
            mScreenOffBrightnessSensorController.setLightSensorEnabled(mUseAutoBrightness
                    && mIsEnabled && (state == Display.STATE_OFF || (state == Display.STATE_DOZE
                    && !mAllowAutoBrightnessWhileDozingConfig))
                    && mLeadDisplayId == Layout.NO_LEAD_DISPLAY);
        }

        boolean skipRampBecauseOfProximityChangeToNegative = false;
        // Apply the proximity sensor.
        if (mProximitySensor != null) {
            if (mPowerRequest.useProximitySensor && state != Display.STATE_OFF) {
                // At this point the policy says that the screen should be on, but we've been
                // asked to listen to the prox sensor to adjust the display state, so lets make
                // sure the sensor is on.
                setProximitySensorEnabled(true);
                if (!mScreenOffBecauseOfProximity
                        && mProximity == PROXIMITY_POSITIVE
                        && !mIgnoreProximityUntilChanged) {
                    // Prox sensor already reporting "near" so we should turn off the screen.
                    // Also checked that we aren't currently set to ignore the proximity sensor
                    // temporarily.
                    mScreenOffBecauseOfProximity = true;
                    sendOnProximityPositiveWithWakelock();
                }
            } else if (mWaitingForNegativeProximity
                    && mScreenOffBecauseOfProximity
                    && mProximity == PROXIMITY_POSITIVE
                    && state != Display.STATE_OFF) {
                // The policy says that we should have the screen on, but it's off due to the prox
                // and we've been asked to wait until the screen is far from the user to turn it
                // back on. Let keep the prox sensor on so we can tell when it's far again.
                setProximitySensorEnabled(true);
            } else {
                // We haven't been asked to use the prox sensor and we're not waiting on the screen
                // to turn back on...so lets shut down the prox sensor.
                setProximitySensorEnabled(false);
                mWaitingForNegativeProximity = false;
            }

            if (mScreenOffBecauseOfProximity
                    && (mProximity != PROXIMITY_POSITIVE || mIgnoreProximityUntilChanged)) {
                // The screen *was* off due to prox being near, but now it's "far" so lets turn
                // the screen back on.  Also turn it back on if we've been asked to ignore the
                // prox sensor temporarily.
                mScreenOffBecauseOfProximity = false;
                skipRampBecauseOfProximityChangeToNegative = true;
                sendOnProximityNegativeWithWakelock();
            }
        } else {
            setProximitySensorEnabled(false);
            mWaitingForNegativeProximity = false;
            mIgnoreProximityUntilChanged = false;

            if (mScreenOffBecauseOfProximity) {
                // The screen *was* off due to prox being near, but now there's no prox sensor, so
                // let's turn the screen back on.
                mScreenOffBecauseOfProximity = false;
                skipRampBecauseOfProximityChangeToNegative = true;
                sendOnProximityNegativeWithWakelock();
            }
        }

        if (!mIsEnabled
                || mIsInTransition
                || mScreenOffBecauseOfProximity) {
            state = Display.STATE_OFF;
        }

        // Initialize things the first time the power state is changed.
        if (mustInitialize) {
            initialize(readyToUpdateDisplayState() ? state : Display.STATE_UNKNOWN);
        }

        // Animate the screen state change unless already animating.
        // The transition may be deferred, so after this point we will use the
        // actual state instead of the desired one.
        final int oldState = mPowerState.getScreenState();
        animateScreenStateChange(state, performScreenOffTransition);
        state = mPowerState.getScreenState();
        boolean slowChange = false;

        if (state == Display.STATE_OFF) {
            brightnessState = PowerManager.BRIGHTNESS_OFF_FLOAT;
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_SCREEN_OFF);
        }

        if (Float.isNaN(brightnessState) && isValidBrightnessValue(mBrightnessToFollow)) {
            brightnessState = mBrightnessToFollow;
            slowChange = mBrightnessToFollowSlowChange;
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_FOLLOWER);
        }

        if ((Float.isNaN(brightnessState))
                && isValidBrightnessValue(mPowerRequest.screenBrightnessOverride)) {
            brightnessState = mPowerRequest.screenBrightnessOverride;
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_OVERRIDE);
            mAppliedScreenBrightnessOverride = true;
        } else {
            mAppliedScreenBrightnessOverride = false;
        }

        final boolean autoBrightnessEnabledInDoze =
                mAllowAutoBrightnessWhileDozingConfig && Display.isDozeState(state);
        final boolean autoBrightnessEnabled = mUseAutoBrightness
                && (state == Display.STATE_ON || autoBrightnessEnabledInDoze)
                && mBrightnessReasonTemp.getReason() != BrightnessReason.REASON_OVERRIDE
                && mAutomaticBrightnessController != null;
        final boolean autoBrightnessDisabledDueToDisplayOff = mUseAutoBrightness
                && !(state == Display.STATE_ON || autoBrightnessEnabledInDoze);
        final int autoBrightnessState = autoBrightnessEnabled
                    && mBrightnessReasonTemp.getReason() != BrightnessReason.REASON_FOLLOWER
                ? AutomaticBrightnessController.AUTO_BRIGHTNESS_ENABLED
                : autoBrightnessDisabledDueToDisplayOff
                        ? AutomaticBrightnessController.AUTO_BRIGHTNESS_OFF_DUE_TO_DISPLAY_STATE
                        : AutomaticBrightnessController.AUTO_BRIGHTNESS_DISABLED;

        final boolean userSetBrightnessChanged = updateUserSetScreenBrightness();

        // Use the temporary screen brightness if there isn't an override, either from
        // WindowManager or based on the display state.
        if (isValidBrightnessValue(mTemporaryScreenBrightness)) {
            brightnessState = mTemporaryScreenBrightness;
            mAppliedTemporaryBrightness = true;
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_TEMPORARY);
        } else {
            mAppliedTemporaryBrightness = false;
        }

        final boolean autoBrightnessAdjustmentChanged = updateAutoBrightnessAdjustment();

        // Use the autobrightness adjustment override if set.
        final float autoBrightnessAdjustment;
        if (!Float.isNaN(mTemporaryAutoBrightnessAdjustment)) {
            autoBrightnessAdjustment = mTemporaryAutoBrightnessAdjustment;
            brightnessAdjustmentFlags = BrightnessReason.ADJUSTMENT_AUTO_TEMP;
            mAppliedTemporaryAutoBrightnessAdjustment = true;
        } else {
            autoBrightnessAdjustment = mAutoBrightnessAdjustment;
            brightnessAdjustmentFlags = BrightnessReason.ADJUSTMENT_AUTO;
            mAppliedTemporaryAutoBrightnessAdjustment = false;
        }
        // Apply brightness boost.
        // We do this here after deciding whether auto-brightness is enabled so that we don't
        // disable the light sensor during this temporary state.  That way when boost ends we will
        // be able to resume normal auto-brightness behavior without any delay.
        if (mPowerRequest.boostScreenBrightness
                && brightnessState != PowerManager.BRIGHTNESS_OFF_FLOAT) {
            brightnessState = PowerManager.BRIGHTNESS_MAX;
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_BOOST);
            mAppliedBrightnessBoost = true;
        } else {
            mAppliedBrightnessBoost = false;
        }

        // If the brightness is already set then it's been overridden by something other than the
        // user, or is a temporary adjustment.
        boolean userInitiatedChange = (Float.isNaN(brightnessState))
                && (autoBrightnessAdjustmentChanged || userSetBrightnessChanged);
        boolean wasShortTermModelActive = false;
        // Configure auto-brightness.
        if (mAutomaticBrightnessController != null) {
            wasShortTermModelActive = mAutomaticBrightnessController.hasUserDataPoints();
            mAutomaticBrightnessController.configure(autoBrightnessState,
                    mBrightnessConfiguration,
                    mLastUserSetScreenBrightness,
                    userSetBrightnessChanged, autoBrightnessAdjustment,
                    autoBrightnessAdjustmentChanged, mPowerRequest.policy,
                    mShouldResetShortTermModel);
            mShouldResetShortTermModel = false;
        }
        mBrightnessRangeController.setAutoBrightnessEnabled(autoBrightnessEnabled
                ? AutomaticBrightnessController.AUTO_BRIGHTNESS_ENABLED
                : autoBrightnessDisabledDueToDisplayOff
                        ? AutomaticBrightnessController.AUTO_BRIGHTNESS_OFF_DUE_TO_DISPLAY_STATE
                        : AutomaticBrightnessController.AUTO_BRIGHTNESS_DISABLED);

        if (mBrightnessTracker != null) {
            mBrightnessTracker.setShouldCollectColorSample(mBrightnessConfiguration != null
                    && mBrightnessConfiguration.shouldCollectColorSamples());
        }

        boolean updateScreenBrightnessSetting = false;
        float rawBrightnessState = brightnessState;

        // Apply auto-brightness.
        if (Float.isNaN(brightnessState)) {
            float newAutoBrightnessAdjustment = autoBrightnessAdjustment;
            if (autoBrightnessEnabled) {
                rawBrightnessState = mAutomaticBrightnessController
                        .getRawAutomaticScreenBrightness();
                brightnessState = mAutomaticBrightnessController.getAutomaticScreenBrightness(
                        mTempBrightnessEvent);
                newAutoBrightnessAdjustment =
                        mAutomaticBrightnessController.getAutomaticScreenBrightnessAdjustment();
            }
            if (isValidBrightnessValue(brightnessState)
                    || brightnessState == PowerManager.BRIGHTNESS_OFF_FLOAT) {
                // Use current auto-brightness value and slowly adjust to changes.
                brightnessState = clampScreenBrightness(brightnessState);
                if (mAppliedAutoBrightness && !autoBrightnessAdjustmentChanged) {
                    slowChange = true; // slowly adapt to auto-brightness
                }
                updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
                mAppliedAutoBrightness = true;
                mBrightnessReasonTemp.setReason(BrightnessReason.REASON_AUTOMATIC);
                if (mScreenOffBrightnessSensorController != null) {
                    mScreenOffBrightnessSensorController.setLightSensorEnabled(false);
                }
            } else {
                mAppliedAutoBrightness = false;
            }
            if (autoBrightnessAdjustment != newAutoBrightnessAdjustment) {
                // If the autobrightness controller has decided to change the adjustment value
                // used, make sure that's reflected in settings.
                putAutoBrightnessAdjustmentSetting(newAutoBrightnessAdjustment);
            } else {
                // Adjustment values resulted in no change
                brightnessAdjustmentFlags = 0;
            }
        } else {
            // Any non-auto-brightness values such as override or temporary should still be subject
            // to clamping so that they don't go beyond the current max as specified by HBM
            // Controller.
            brightnessState = clampScreenBrightness(brightnessState);
            mAppliedAutoBrightness = false;
            brightnessAdjustmentFlags = 0;
        }
        // Use default brightness when dozing unless overridden.
        if ((Float.isNaN(brightnessState))
                && Display.isDozeState(state)) {
            rawBrightnessState = mScreenBrightnessDozeConfig;
            brightnessState = clampScreenBrightness(rawBrightnessState);
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_DOZE_DEFAULT);
        }

        // The ALS is not available yet - use the screen off sensor to determine the initial
        // brightness
        if (Float.isNaN(brightnessState) && autoBrightnessEnabled
                && mScreenOffBrightnessSensorController != null) {
            rawBrightnessState =
                    mScreenOffBrightnessSensorController.getAutomaticScreenBrightness();
            brightnessState = rawBrightnessState;
            if (isValidBrightnessValue(brightnessState)) {
                brightnessState = clampScreenBrightness(brightnessState);
                updateScreenBrightnessSetting = mCurrentScreenBrightnessSetting != brightnessState;
                mBrightnessReasonTemp.setReason(
                        BrightnessReason.REASON_SCREEN_OFF_BRIGHTNESS_SENSOR);
            }
        }

        // Apply manual brightness.
        if (Float.isNaN(brightnessState)) {
            rawBrightnessState = mCurrentScreenBrightnessSetting;
            brightnessState = clampScreenBrightness(rawBrightnessState);
            if (brightnessState != mCurrentScreenBrightnessSetting) {
                // The manually chosen screen brightness is outside of the currently allowed
                // range (i.e., high-brightness-mode), make sure we tell the rest of the system
                // by updating the setting.
                updateScreenBrightnessSetting = true;
            }
            mBrightnessReasonTemp.setReason(BrightnessReason.REASON_MANUAL);
        }

        float ambientLux = mAutomaticBrightnessController == null ? 0
                : mAutomaticBrightnessController.getAmbientLux();
        for (int i = 0; i < displayBrightnessFollowers.size(); i++) {
            DisplayPowerControllerInterface follower = displayBrightnessFollowers.valueAt(i);
            follower.setBrightnessToFollow(rawBrightnessState, convertToNits(rawBrightnessState),
                    ambientLux, slowChange);
        }

        // Now that a desired brightness has been calculated, apply brightness throttling. The
        // dimming and low power transformations that follow can only dim brightness further.
        //
        // We didn't do this earlier through brightness clamping because we need to know both
        // unthrottled (unclamped/ideal) and throttled brightness levels for subsequent operations.
        // Note throttling effectively changes the allowed brightness range, so, similarly to HBM,
        // we broadcast this change through setting.
        final float unthrottledBrightnessState = brightnessState;
        if (mBrightnessThrottler.isThrottled()) {
            mTempBrightnessEvent.setThermalMax(mBrightnessThrottler.getBrightnessCap());
            brightnessState = Math.min(brightnessState, mBrightnessThrottler.getBrightnessCap());
            mBrightnessReasonTemp.addModifier(BrightnessReason.MODIFIER_THROTTLED);
            if (!mAppliedThrottling) {
                // Brightness throttling is needed, so do so quickly.
                // Later, when throttling is removed, we let other mechanisms decide on speed.
                slowChange = false;
            }
            mAppliedThrottling = true;
        } else if (mAppliedThrottling) {
            mAppliedThrottling = false;
        }

        if (updateScreenBrightnessSetting) {
            // Tell the rest of the system about the new brightness in case we had to change it
            // for things like auto-brightness or high-brightness-mode. Note that we do this
            // before applying the low power or dim transformations so that the slider
            // accurately represents the full possible range, even if they range changes what
            // it means in absolute terms.
            updateScreenBrightnessSetting(brightnessState);
        }

        // Apply dimming by at least some minimum amount when user activity
        // timeout is about to expire.
        if (mPowerRequest.policy == DisplayPowerRequest.POLICY_DIM) {
            if (brightnessState > PowerManager.BRIGHTNESS_MIN) {
                brightnessState = Math.max(
                        Math.min(brightnessState - mScreenBrightnessMinimumDimAmount,
                                mScreenBrightnessDimConfig),
                        PowerManager.BRIGHTNESS_MIN);
                mBrightnessReasonTemp.addModifier(BrightnessReason.MODIFIER_DIMMED);
            }
            if (!mAppliedDimming) {
                slowChange = false;
            }
            mAppliedDimming = true;
        } else if (mAppliedDimming) {
            slowChange = false;
            mAppliedDimming = false;
        }
        // If low power mode is enabled, scale brightness by screenLowPowerBrightnessFactor
        // as long as it is above the minimum threshold.
        if (mPowerRequest.lowPowerMode) {
            if (brightnessState > PowerManager.BRIGHTNESS_MIN) {
                final float brightnessFactor =
                        Math.min(mPowerRequest.screenLowPowerBrightnessFactor, 1);
                final float lowPowerBrightnessFloat = (brightnessState * brightnessFactor);
                brightnessState = Math.max(lowPowerBrightnessFloat, PowerManager.BRIGHTNESS_MIN);
                mBrightnessReasonTemp.addModifier(BrightnessReason.MODIFIER_LOW_POWER);
            }
            if (!mAppliedLowPower) {
                slowChange = false;
            }
            mAppliedLowPower = true;
        } else if (mAppliedLowPower) {
            slowChange = false;
            mAppliedLowPower = false;
        }

        // The current brightness to use has been calculated at this point, and HbmController should
        // be notified so that it can accurately calculate HDR or HBM levels. We specifically do it
        // here instead of having HbmController listen to the brightness setting because certain
        // brightness sources (such as an app override) are not saved to the setting, but should be
        // reflected in HBM calculations.
        mBrightnessRangeController.onBrightnessChanged(brightnessState, unthrottledBrightnessState,
                mBrightnessThrottler.getBrightnessMaxReason());

        // Animate the screen brightness when the screen is on or dozing.
        // Skip the animation when the screen is off.
        boolean brightnessAdjusted = false;
        final boolean brightnessIsTemporary =
                mAppliedTemporaryBrightness || mAppliedTemporaryAutoBrightnessAdjustment;
        if (!mPendingScreenOff) {
            if (mSkipScreenOnBrightnessRamp) {
                if (state == Display.STATE_ON) {
                    if (mSkipRampState == RAMP_STATE_SKIP_NONE && mDozing) {
                        mInitialAutoBrightness = brightnessState;
                        mSkipRampState = RAMP_STATE_SKIP_INITIAL;
                    } else if (mSkipRampState == RAMP_STATE_SKIP_INITIAL
                            && mUseSoftwareAutoBrightnessConfig
                            && !BrightnessSynchronizer.floatEquals(brightnessState,
                            mInitialAutoBrightness)) {
                        mSkipRampState = RAMP_STATE_SKIP_AUTOBRIGHT;
                    } else if (mSkipRampState == RAMP_STATE_SKIP_AUTOBRIGHT) {
                        mSkipRampState = RAMP_STATE_SKIP_NONE;
                    }
                } else {
                    mSkipRampState = RAMP_STATE_SKIP_NONE;
                }
            }

            final boolean initialRampSkip = (state == Display.STATE_ON && mSkipRampState
                    != RAMP_STATE_SKIP_NONE) || skipRampBecauseOfProximityChangeToNegative;
            // While dozing, sometimes the brightness is split into buckets. Rather than animating
            // through the buckets, which is unlikely to be smooth in the first place, just jump
            // right to the suggested brightness.
            final boolean hasBrightnessBuckets =
                    Display.isDozeState(state) && mBrightnessBucketsInDozeConfig;
            // If the color fade is totally covering the screen then we can change the backlight
            // level without it being a noticeable jump since any actual content isn't yet visible.
            final boolean isDisplayContentVisible =
                    mColorFadeEnabled && mPowerState.getColorFadeLevel() == 1.0f;
            // We only want to animate the brightness if it is between 0.0f and 1.0f.
            // brightnessState can contain the values -1.0f and NaN, which we do not want to
            // animate to. To avoid this, we check the value first.
            // If the brightnessState is off (-1.0f) we still want to animate to the minimum
            // brightness (0.0f) to accommodate for LED displays, which can appear bright to the
            // user even when the display is all black. We also clamp here in case some
            // transformations to the brightness have pushed it outside of the currently
            // allowed range.
            float animateValue = clampScreenBrightness(brightnessState);

            // If there are any HDR layers on the screen, we have a special brightness value that we
            // use instead. We still preserve the calculated brightness for Standard Dynamic Range
            // (SDR) layers, but the main brightness value will be the one for HDR.
            float sdrAnimateValue = animateValue;
            // TODO(b/216365040): The decision to prevent HBM for HDR in low power mode should be
            // done in HighBrightnessModeController.
            if (mBrightnessRangeController.getHighBrightnessMode()
                    == BrightnessInfo.HIGH_BRIGHTNESS_MODE_HDR
                    && (mBrightnessReasonTemp.getModifier() & BrightnessReason.MODIFIER_DIMMED) == 0
                    && (mBrightnessReasonTemp.getModifier() & BrightnessReason.MODIFIER_LOW_POWER)
                    == 0) {
                // We want to scale HDR brightness level with the SDR level, we also need to restore
                // SDR brightness immediately when entering dim or low power mode.
                animateValue = mBrightnessRangeController.getHdrBrightnessValue();
            }

            final float currentBrightness = mPowerState.getScreenBrightness();
            final float currentSdrBrightness = mPowerState.getSdrScreenBrightness();
            if (isValidBrightnessValue(animateValue)
                    && (animateValue != currentBrightness
                    || sdrAnimateValue != currentSdrBrightness)) {
                if (initialRampSkip || hasBrightnessBuckets
                        || !isDisplayContentVisible || brightnessIsTemporary) {
                    animateScreenBrightness(animateValue, sdrAnimateValue,
                            SCREEN_ANIMATION_RATE_MINIMUM);
                } else {
                    boolean isIncreasing = animateValue > currentBrightness;
                    final float rampSpeed;
                    if (isIncreasing && slowChange) {
                        rampSpeed = mBrightnessRampRateSlowIncrease;
                    } else if (isIncreasing && !slowChange) {
                        rampSpeed = mBrightnessRampRateFastIncrease;
                    } else if (!isIncreasing && slowChange) {
                        rampSpeed = mBrightnessRampRateSlowDecrease;
                    } else {
                        rampSpeed = mBrightnessRampRateFastDecrease;
                    }
                    animateScreenBrightness(animateValue, sdrAnimateValue, rampSpeed);
                }
            }

            notifyBrightnessTrackerChanged(brightnessState, userInitiatedChange,
                    wasShortTermModelActive, autoBrightnessEnabled, brightnessIsTemporary);

            // We save the brightness info *after* the brightness setting has been changed and
            // adjustments made so that the brightness info reflects the latest value.
            brightnessAdjusted = saveBrightnessInfo(getScreenBrightnessSetting(), animateValue);
        } else {
            brightnessAdjusted = saveBrightnessInfo(getScreenBrightnessSetting());
        }

        // Only notify if the brightness adjustment is not temporary (i.e. slider has been released)
        if (brightnessAdjusted && !brightnessIsTemporary) {
            postBrightnessChangeRunnable();
        }

        // Log any changes to what is currently driving the brightness setting.
        if (!mBrightnessReasonTemp.equals(mBrightnessReason) || brightnessAdjustmentFlags != 0) {
            Slog.v(mTag, "Brightness [" + brightnessState + "] reason changing to: '"
                    + mBrightnessReasonTemp.toString(brightnessAdjustmentFlags)
                    + "', previous reason: '" + mBrightnessReason + "'.");
            mBrightnessReason.set(mBrightnessReasonTemp);
        } else if (mBrightnessReasonTemp.getReason() == BrightnessReason.REASON_MANUAL
                && userSetBrightnessChanged) {
            Slog.v(mTag, "Brightness [" + brightnessState + "] manual adjustment.");
        }


        // Log brightness events when a detail of significance has changed. Generally this is the
        // brightness itself changing, but also includes data like HBM cap, thermal throttling
        // brightness cap, RBC state, etc.
        mTempBrightnessEvent.setTime(System.currentTimeMillis());
        mTempBrightnessEvent.setBrightness(brightnessState);
        mTempBrightnessEvent.setPhysicalDisplayId(mUniqueDisplayId);
        mTempBrightnessEvent.setReason(mBrightnessReason);
        mTempBrightnessEvent.setHbmMax(mBrightnessRangeController.getCurrentBrightnessMax());
        mTempBrightnessEvent.setHbmMode(mBrightnessRangeController.getHighBrightnessMode());
        mTempBrightnessEvent.setFlags(mTempBrightnessEvent.getFlags()
                | (mIsRbcActive ? BrightnessEvent.FLAG_RBC : 0)
                | (mPowerRequest.lowPowerMode ? BrightnessEvent.FLAG_LOW_POWER_MODE : 0));
        mTempBrightnessEvent.setRbcStrength(mCdsi != null
                ? mCdsi.getReduceBrightColorsStrength() : -1);
        mTempBrightnessEvent.setPowerFactor(mPowerRequest.screenLowPowerBrightnessFactor);
        mTempBrightnessEvent.setWasShortTermModelActive(wasShortTermModelActive);
        mTempBrightnessEvent.setAutomaticBrightnessEnabled(mUseAutoBrightness);
        // Temporary is what we use during slider interactions. We avoid logging those so that
        // we don't spam logcat when the slider is being used.
        boolean tempToTempTransition =
                mTempBrightnessEvent.getReason().getReason() == BrightnessReason.REASON_TEMPORARY
                        && mLastBrightnessEvent.getReason().getReason()
                        == BrightnessReason.REASON_TEMPORARY;
        if ((!mTempBrightnessEvent.equalsMainData(mLastBrightnessEvent) && !tempToTempTransition)
                || brightnessAdjustmentFlags != 0) {
            mTempBrightnessEvent.setInitialBrightness(mLastBrightnessEvent.getBrightness());
            mLastBrightnessEvent.copyFrom(mTempBrightnessEvent);
            BrightnessEvent newEvent = new BrightnessEvent(mTempBrightnessEvent);
            // Adjustment flags (and user-set flag) only get added after the equality checks since
            // they are transient.
            newEvent.setAdjustmentFlags(brightnessAdjustmentFlags);
            newEvent.setFlags(newEvent.getFlags() | (userSetBrightnessChanged
                    ? BrightnessEvent.FLAG_USER_SET : 0));
            Slog.i(mTag, newEvent.toString(/* includeTime= */ false));

            if (userSetBrightnessChanged
                    || newEvent.getReason().getReason() != BrightnessReason.REASON_TEMPORARY) {
                logBrightnessEvent(newEvent, unthrottledBrightnessState);
            }
            if (mBrightnessEventRingBuffer != null) {
                mBrightnessEventRingBuffer.append(newEvent);
            }
        }

        // Update display white-balance.
        if (mDisplayWhiteBalanceController != null) {
            if (state == Display.STATE_ON && mDisplayWhiteBalanceSettings.isEnabled()) {
                mDisplayWhiteBalanceController.setEnabled(true);
                mDisplayWhiteBalanceController.updateDisplayColorTemperature();
            } else {
                mDisplayWhiteBalanceController.setEnabled(false);
            }
        }

        // Determine whether the display is ready for use in the newly requested state.
        // Note that we do not wait for the brightness ramp animation to complete before
        // reporting the display is ready because we only need to ensure the screen is in the
        // right power state even as it continues to converge on the desired brightness.
        final boolean ready = mPendingScreenOnUnblocker == null
                && (!mColorFadeEnabled || (!mColorFadeOnAnimator.isStarted()
                        && !mColorFadeOffAnimator.isStarted()))
                && mPowerState.waitUntilClean(mCleanListener);
        final boolean finished = ready
                && !mScreenBrightnessRampAnimator.isAnimating();

        // Notify policy about screen turned on.
        if (ready && state != Display.STATE_OFF
                && mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_TURNING_ON) {
            setReportedScreenState(REPORTED_TO_POLICY_SCREEN_ON);
            mWindowManagerPolicy.screenTurnedOn(mDisplayId);
        }

        // Grab a wake lock if we have unfinished business.
        if (!finished && !mUnfinishedBusiness) {
            if (DEBUG) {
                Slog.d(mTag, "Unfinished business...");
            }
            mCallbacks.acquireSuspendBlocker(mSuspendBlockerIdUnfinishedBusiness);
            mUnfinishedBusiness = true;
        }

        // Notify the power manager when ready.
        if (ready && mustNotify) {
            // Send state change.
            synchronized (mLock) {
                if (!mPendingRequestChangedLocked) {
                    mDisplayReadyLocked = true;

                    if (DEBUG) {
                        Slog.d(mTag, "Display ready!");
                    }
                }
            }
            sendOnStateChangedWithWakelock();
        }

        // Release the wake lock when we have no unfinished business.
        if (finished && mUnfinishedBusiness) {
            if (DEBUG) {
                Slog.d(mTag, "Finished business...");
            }
            mUnfinishedBusiness = false;
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdUnfinishedBusiness);
        }

        // Record if dozing for future comparison.
        mDozing = state != Display.STATE_ON;

        if (previousPolicy != mPowerRequest.policy) {
            logDisplayPolicyChanged(mPowerRequest.policy);
        }
    }

    private void setDwbcOverride(float cct) {
        if (mDisplayWhiteBalanceController != null) {
            mDisplayWhiteBalanceController.setAmbientColorTemperatureOverride(cct);
            // The ambient color temperature override is only applied when the ambient color
            // temperature changes or is updated, so it doesn't necessarily change the screen color
            // temperature immediately. So, let's make it!
            // We can call this directly, since we're already on the handler thread.
            updatePowerState();
        }
    }

    private void setDwbcStrongMode(int arg) {
        if (mDisplayWhiteBalanceController != null) {
            final boolean isIdle = (arg == 1);
            mDisplayWhiteBalanceController.setStrongModeEnabled(isIdle);
        }
    }

    private void setDwbcLoggingEnabled(int arg) {
        if (mDisplayWhiteBalanceController != null) {
            final boolean shouldEnable = (arg == 1);
            mDisplayWhiteBalanceController.setLoggingEnabled(shouldEnable);
            mDisplayWhiteBalanceSettings.setLoggingEnabled(shouldEnable);
        }
    }

    @Override
    public void updateBrightness() {
        sendUpdatePowerState();
    }

    /**
     * Ignores the proximity sensor until the sensor state changes, but only if the sensor is
     * currently enabled and forcing the screen to be dark.
     */
    @Override
    public void ignoreProximitySensorUntilChanged() {
        mHandler.sendEmptyMessage(MSG_IGNORE_PROXIMITY);
    }

    @Override
    public void setBrightnessConfiguration(BrightnessConfiguration c,
            boolean shouldResetShortTermModel) {
        Message msg = mHandler.obtainMessage(MSG_CONFIGURE_BRIGHTNESS,
                shouldResetShortTermModel ? 1 : 0, /* unused */ 0, c);
        msg.sendToTarget();
    }

    @Override
    public void setTemporaryBrightness(float brightness) {
        Message msg = mHandler.obtainMessage(MSG_SET_TEMPORARY_BRIGHTNESS,
                Float.floatToIntBits(brightness), 0 /*unused*/);
        msg.sendToTarget();
    }

    @Override
    public void setTemporaryAutoBrightnessAdjustment(float adjustment) {
        Message msg = mHandler.obtainMessage(MSG_SET_TEMPORARY_AUTO_BRIGHTNESS_ADJUSTMENT,
                Float.floatToIntBits(adjustment), 0 /*unused*/);
        msg.sendToTarget();
    }

    @Override
    public BrightnessInfo getBrightnessInfo() {
        synchronized (mCachedBrightnessInfo) {
            return new BrightnessInfo(
                    mCachedBrightnessInfo.brightness.value,
                    mCachedBrightnessInfo.adjustedBrightness.value,
                    mCachedBrightnessInfo.brightnessMin.value,
                    mCachedBrightnessInfo.brightnessMax.value,
                    mCachedBrightnessInfo.hbmMode.value,
                    mCachedBrightnessInfo.hbmTransitionPoint.value,
                    mCachedBrightnessInfo.brightnessMaxReason.value);
        }
    }

    private boolean saveBrightnessInfo(float brightness) {
        return saveBrightnessInfo(brightness, brightness);
    }

    private boolean saveBrightnessInfo(float brightness, float adjustedBrightness) {
        synchronized (mCachedBrightnessInfo) {
            final float minBrightness = Math.min(
                    mBrightnessRangeController.getCurrentBrightnessMin(),
                    mBrightnessThrottler.getBrightnessCap());
            final float maxBrightness = Math.min(
                    mBrightnessRangeController.getCurrentBrightnessMax(),
                    mBrightnessThrottler.getBrightnessCap());
            boolean changed = false;

            changed |=
                    mCachedBrightnessInfo.checkAndSetFloat(mCachedBrightnessInfo.brightness,
                            brightness);
            changed |=
                    mCachedBrightnessInfo.checkAndSetFloat(mCachedBrightnessInfo.adjustedBrightness,
                            adjustedBrightness);
            changed |=
                    mCachedBrightnessInfo.checkAndSetFloat(mCachedBrightnessInfo.brightnessMin,
                            minBrightness);
            changed |=
                    mCachedBrightnessInfo.checkAndSetFloat(mCachedBrightnessInfo.brightnessMax,
                            maxBrightness);
            changed |=
                    mCachedBrightnessInfo.checkAndSetInt(mCachedBrightnessInfo.hbmMode,
                            mBrightnessRangeController.getHighBrightnessMode());
            changed |=
                    mCachedBrightnessInfo.checkAndSetFloat(mCachedBrightnessInfo.hbmTransitionPoint,
                            mBrightnessRangeController.getTransitionPoint());
            changed |=
                    mCachedBrightnessInfo.checkAndSetInt(mCachedBrightnessInfo.brightnessMaxReason,
                            mBrightnessThrottler.getBrightnessMaxReason());

            return changed;
        }
    }

    void postBrightnessChangeRunnable() {
        if (!mHandler.hasCallbacks(mOnBrightnessChangeRunnable)) {
            mHandler.post(mOnBrightnessChangeRunnable);
        }
    }

    private HighBrightnessModeController createHbmControllerLocked(
            Runnable modeChangeCallback) {
        final DisplayDevice device = mLogicalDisplay.getPrimaryDisplayDeviceLocked();
        final DisplayDeviceConfig ddConfig = device.getDisplayDeviceConfig();
        final IBinder displayToken =
                mLogicalDisplay.getPrimaryDisplayDeviceLocked().getDisplayTokenLocked();
        final String displayUniqueId =
                mLogicalDisplay.getPrimaryDisplayDeviceLocked().getUniqueId();
        final DisplayDeviceConfig.HighBrightnessModeData hbmData =
                ddConfig != null ? ddConfig.getHighBrightnessModeData() : null;
        final DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked();
        return mInjector.getHighBrightnessModeController(mHandler, info.width, info.height,
                displayToken, displayUniqueId, PowerManager.BRIGHTNESS_MIN,
                PowerManager.BRIGHTNESS_MAX, hbmData,
                new HighBrightnessModeController.HdrBrightnessDeviceConfig() {
                    @Override
                    public float getHdrBrightnessFromSdr(
                            float sdrBrightness, float maxDesiredHdrSdrRatio) {
                        return mDisplayDeviceConfig.getHdrBrightnessFromSdr(
                                sdrBrightness, maxDesiredHdrSdrRatio);
                    }
                }, modeChangeCallback, mHighBrightnessModeMetadata, mContext);
    }

    private BrightnessThrottler createBrightnessThrottlerLocked() {
        final DisplayDevice device = mLogicalDisplay.getPrimaryDisplayDeviceLocked();
        final DisplayDeviceConfig ddConfig = device.getDisplayDeviceConfig();
        return new BrightnessThrottler(mHandler,
                () -> {
                    sendUpdatePowerState();
                    postBrightnessChangeRunnable();
                }, mUniqueDisplayId,
                mLogicalDisplay.getDisplayInfoLocked().thermalBrightnessThrottlingDataId,
                ddConfig.getThermalBrightnessThrottlingDataMapByThrottlingId());
    }

    private void blockScreenOn() {
        if (mPendingScreenOnUnblocker == null) {
            Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0);
            mPendingScreenOnUnblocker = new ScreenOnUnblocker();
            mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime();
            Slog.i(mTag, "Blocking screen on until initial contents have been drawn.");
        }
    }

    private void unblockScreenOn() {
        if (mPendingScreenOnUnblocker != null) {
            mPendingScreenOnUnblocker = null;
            long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime;
            Slog.i(mTag, "Unblocked screen on after " + delay + " ms");
            Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0);
        }
    }

    private void blockScreenOff() {
        if (mPendingScreenOffUnblocker == null) {
            Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_OFF_BLOCKED_TRACE_NAME, 0);
            mPendingScreenOffUnblocker = new ScreenOffUnblocker();
            mScreenOffBlockStartRealTime = SystemClock.elapsedRealtime();
            Slog.i(mTag, "Blocking screen off");
        }
    }

    private void unblockScreenOff() {
        if (mPendingScreenOffUnblocker != null) {
            mPendingScreenOffUnblocker = null;
            long delay = SystemClock.elapsedRealtime() - mScreenOffBlockStartRealTime;
            Slog.i(mTag, "Unblocked screen off after " + delay + " ms");
            Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_OFF_BLOCKED_TRACE_NAME, 0);
        }
    }

    private boolean setScreenState(int state) {
        return setScreenState(state, false /*reportOnly*/);
    }

    private boolean setScreenState(int state, boolean reportOnly) {
        final boolean isOff = (state == Display.STATE_OFF);

        if (mPowerState.getScreenState() != state
                || mReportedScreenStateToPolicy == REPORTED_TO_POLICY_UNREPORTED) {
            // If we are trying to turn screen off, give policy a chance to do something before we
            // actually turn the screen off.
            if (isOff && !mScreenOffBecauseOfProximity) {
                if (mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_ON
                        || mReportedScreenStateToPolicy == REPORTED_TO_POLICY_UNREPORTED) {
                    setReportedScreenState(REPORTED_TO_POLICY_SCREEN_TURNING_OFF);
                    blockScreenOff();
                    mWindowManagerPolicy.screenTurningOff(mDisplayId, mPendingScreenOffUnblocker);
                    unblockScreenOff();
                } else if (mPendingScreenOffUnblocker != null) {
                    // Abort doing the state change until screen off is unblocked.
                    return false;
                }
            }

            if (!reportOnly && mPowerState.getScreenState() != state
                    && readyToUpdateDisplayState()) {
                Trace.traceCounter(Trace.TRACE_TAG_POWER, "ScreenState", state);

                String propertyKey = "debug.tracing.screen_state";
                String propertyValue = String.valueOf(state);
                try {
                    // TODO(b/153319140) remove when we can get this from the above trace invocation
                    SystemProperties.set(propertyKey, propertyValue);
                } catch (RuntimeException e) {
                    Slog.e(mTag, "Failed to set a system property: key=" + propertyKey
                            + " value=" + propertyValue + " " + e.getMessage());
                }

                mPowerState.setScreenState(state);
                // Tell battery stats about the transition.
                noteScreenState(state);
            }
        }

        // Tell the window manager policy when the screen is turned off or on unless it's due
        // to the proximity sensor.  We temporarily block turning the screen on until the
        // window manager is ready by leaving a black surface covering the screen.
        // This surface is essentially the final state of the color fade animation and
        // it is only removed once the window manager tells us that the activity has
        // finished drawing underneath.
        if (isOff && mReportedScreenStateToPolicy != REPORTED_TO_POLICY_SCREEN_OFF
                && !mScreenOffBecauseOfProximity) {
            setReportedScreenState(REPORTED_TO_POLICY_SCREEN_OFF);
            unblockScreenOn();
            mWindowManagerPolicy.screenTurnedOff(mDisplayId, mIsInTransition);
        } else if (!isOff
                && mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_TURNING_OFF) {

            // We told policy already that screen was turning off, but now we changed our minds.
            // Complete the full state transition on -> turningOff -> off.
            unblockScreenOff();
            mWindowManagerPolicy.screenTurnedOff(mDisplayId, mIsInTransition);
            setReportedScreenState(REPORTED_TO_POLICY_SCREEN_OFF);
        }
        if (!isOff
                && (mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_OFF
                || mReportedScreenStateToPolicy == REPORTED_TO_POLICY_UNREPORTED)) {
            setReportedScreenState(REPORTED_TO_POLICY_SCREEN_TURNING_ON);
            if (mPowerState.getColorFadeLevel() == 0.0f) {
                blockScreenOn();
            } else {
                unblockScreenOn();
            }
            mWindowManagerPolicy.screenTurningOn(mDisplayId, mPendingScreenOnUnblocker);
        }

        // Return true if the screen isn't blocked.
        return mPendingScreenOnUnblocker == null;
    }

    private void setReportedScreenState(int state) {
        Trace.traceCounter(Trace.TRACE_TAG_POWER, "ReportedScreenStateToPolicy", state);
        mReportedScreenStateToPolicy = state;
    }

    private void loadAmbientLightSensor() {
        final int fallbackType = mDisplayId == Display.DEFAULT_DISPLAY
                ? Sensor.TYPE_LIGHT : SensorUtils.NO_FALLBACK;
        mLightSensor = SensorUtils.findSensor(mSensorManager,
                mDisplayDeviceConfig.getAmbientLightSensor(), fallbackType);
    }

    private void loadScreenOffBrightnessSensor() {
        mScreenOffBrightnessSensor = SensorUtils.findSensor(mSensorManager,
                mDisplayDeviceConfig.getScreenOffBrightnessSensor(), SensorUtils.NO_FALLBACK);
    }

    private void loadProximitySensor() {
        if (DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT || mDisplayId != Display.DEFAULT_DISPLAY) {
            return;
        }
        mProximitySensor = SensorUtils.findSensor(mSensorManager,
                mDisplayDeviceConfig.getProximitySensor(), Sensor.TYPE_PROXIMITY);
        if (mProximitySensor != null) {
            mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(),
                    TYPICAL_PROXIMITY_THRESHOLD);
        }
    }

    private float clampScreenBrightness(float value) {
        if (Float.isNaN(value)) {
            value = PowerManager.BRIGHTNESS_MIN;
        }
        return MathUtils.constrain(value, mBrightnessRangeController.getCurrentBrightnessMin(),
                mBrightnessRangeController.getCurrentBrightnessMax());
    }

    // Checks whether the brightness is within the valid brightness range, not including off.
    private boolean isValidBrightnessValue(float brightness) {
        return brightness >= PowerManager.BRIGHTNESS_MIN
                && brightness <= PowerManager.BRIGHTNESS_MAX;
    }

    private void animateScreenBrightness(float target, float sdrTarget, float rate) {
        if (DEBUG) {
            Slog.d(mTag, "Animating brightness: target=" + target + ", sdrTarget=" + sdrTarget
                    + ", rate=" + rate);
        }
        if (mScreenBrightnessRampAnimator.animateTo(target, sdrTarget, rate)) {
            Trace.traceCounter(Trace.TRACE_TAG_POWER, "TargetScreenBrightness", (int) target);

            String propertyKey = "debug.tracing.screen_brightness";
            String propertyValue = String.valueOf(target);
            try {
                // TODO(b/153319140) remove when we can get this from the above trace invocation
                SystemProperties.set(propertyKey, propertyValue);
            } catch (RuntimeException e) {
                Slog.e(mTag, "Failed to set a system property: key=" + propertyKey
                        + " value=" + propertyValue + " " + e.getMessage());
            }

            noteScreenBrightness(target);
        }
    }

    private void animateScreenStateChange(int target, boolean performScreenOffTransition) {
        // If there is already an animation in progress, don't interfere with it.
        if (mColorFadeEnabled
                && (mColorFadeOnAnimator.isStarted() || mColorFadeOffAnimator.isStarted())) {
            if (target != Display.STATE_ON) {
                return;
            }
            // If display state changed to on, proceed and stop the color fade and turn screen on.
            mPendingScreenOff = false;
        }

        if (mDisplayBlanksAfterDozeConfig
                && Display.isDozeState(mPowerState.getScreenState())
                && !Display.isDozeState(target)) {
            // Skip the screen off animation and add a black surface to hide the
            // contents of the screen.
            mPowerState.prepareColorFade(mContext,
                    mColorFadeFadesConfig ? ColorFade.MODE_FADE : ColorFade.MODE_WARM_UP);
            if (mColorFadeOffAnimator != null) {
                mColorFadeOffAnimator.end();
            }
            // Some display hardware will blank itself on the transition between doze and non-doze
            // but still on display states. In this case we want to report to policy that the
            // display has turned off so it can prepare the appropriate power on animation, but we
            // don't want to actually transition to the fully off state since that takes
            // significantly longer to transition from.
            setScreenState(Display.STATE_OFF, target != Display.STATE_OFF /*reportOnly*/);
        }

        // If we were in the process of turning off the screen but didn't quite
        // finish.  Then finish up now to prevent a jarring transition back
        // to screen on if we skipped blocking screen on as usual.
        if (mPendingScreenOff && target != Display.STATE_OFF) {
            setScreenState(Display.STATE_OFF);
            mPendingScreenOff = false;
            mPowerState.dismissColorFadeResources();
        }

        if (target == Display.STATE_ON) {
            // Want screen on.  The contents of the screen may not yet
            // be visible if the color fade has not been dismissed because
            // its last frame of animation is solid black.
            if (!setScreenState(Display.STATE_ON)) {
                return; // screen on blocked
            }
            if (USE_COLOR_FADE_ON_ANIMATION && mColorFadeEnabled && mPowerRequest.isBrightOrDim()) {
                // Perform screen on animation.
                if (mPowerState.getColorFadeLevel() == 1.0f) {
                    mPowerState.dismissColorFade();
                } else if (mPowerState.prepareColorFade(mContext,
                        mColorFadeFadesConfig
                                ? ColorFade.MODE_FADE : ColorFade.MODE_WARM_UP)) {
                    mColorFadeOnAnimator.start();
                } else {
                    mColorFadeOnAnimator.end();
                }
            } else {
                // Skip screen on animation.
                mPowerState.setColorFadeLevel(1.0f);
                mPowerState.dismissColorFade();
            }
        } else if (target == Display.STATE_DOZE) {
            // Want screen dozing.
            // Wait for brightness animation to complete beforehand when entering doze
            // from screen on to prevent a perceptible jump because brightness may operate
            // differently when the display is configured for dozing.
            if (mScreenBrightnessRampAnimator.isAnimating()
                    && mPowerState.getScreenState() == Display.STATE_ON) {
                return;
            }

            // Set screen state.
            if (!setScreenState(Display.STATE_DOZE)) {
                return; // screen on blocked
            }

            // Dismiss the black surface without fanfare.
            mPowerState.setColorFadeLevel(1.0f);
            mPowerState.dismissColorFade();
        } else if (target == Display.STATE_DOZE_SUSPEND) {
            // Want screen dozing and suspended.
            // Wait for brightness animation to complete beforehand unless already
            // suspended because we may not be able to change it after suspension.
            if (mScreenBrightnessRampAnimator.isAnimating()
                    && mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) {
                return;
            }

            // If not already suspending, temporarily set the state to doze until the
            // screen on is unblocked, then suspend.
            if (mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) {
                if (!setScreenState(Display.STATE_DOZE)) {
                    return; // screen on blocked
                }
                setScreenState(Display.STATE_DOZE_SUSPEND); // already on so can't block
            }

            // Dismiss the black surface without fanfare.
            mPowerState.setColorFadeLevel(1.0f);
            mPowerState.dismissColorFade();
        } else if (target == Display.STATE_ON_SUSPEND) {
            // Want screen full-power and suspended.
            // Wait for brightness animation to complete beforehand unless already
            // suspended because we may not be able to change it after suspension.
            if (mScreenBrightnessRampAnimator.isAnimating()
                    && mPowerState.getScreenState() != Display.STATE_ON_SUSPEND) {
                return;
            }

            // If not already suspending, temporarily set the state to on until the
            // screen on is unblocked, then suspend.
            if (mPowerState.getScreenState() != Display.STATE_ON_SUSPEND) {
                if (!setScreenState(Display.STATE_ON)) {
                    return;
                }
                setScreenState(Display.STATE_ON_SUSPEND);
            }

            // Dismiss the black surface without fanfare.
            mPowerState.setColorFadeLevel(1.0f);
            mPowerState.dismissColorFade();
        } else {
            // Want screen off.
            mPendingScreenOff = true;
            if (!mColorFadeEnabled) {
                mPowerState.setColorFadeLevel(0.0f);
            }

            if (mPowerState.getColorFadeLevel() == 0.0f) {
                // Turn the screen off.
                // A black surface is already hiding the contents of the screen.
                setScreenState(Display.STATE_OFF);
                mPendingScreenOff = false;
                mPowerState.dismissColorFadeResources();
            } else if (performScreenOffTransition
                    && mPowerState.prepareColorFade(mContext,
                    mColorFadeFadesConfig
                            ? ColorFade.MODE_FADE : ColorFade.MODE_COOL_DOWN)
                    && mPowerState.getScreenState() != Display.STATE_OFF) {
                // Perform the screen off animation.
                mColorFadeOffAnimator.start();
            } else {
                // Skip the screen off animation and add a black surface to hide the
                // contents of the screen.
                mColorFadeOffAnimator.end();
            }
        }
    }

    private final Runnable mCleanListener = this::sendUpdatePowerState;

    private void setProximitySensorEnabled(boolean enable) {
        if (enable) {
            if (!mProximitySensorEnabled) {
                // Register the listener.
                // Proximity sensor state already cleared initially.
                mProximitySensorEnabled = true;
                mIgnoreProximityUntilChanged = false;
                mSensorManager.registerListener(mProximitySensorListener, mProximitySensor,
                        SensorManager.SENSOR_DELAY_NORMAL, mHandler);
            }
        } else {
            if (mProximitySensorEnabled) {
                // Unregister the listener.
                // Clear the proximity sensor state for next time.
                mProximitySensorEnabled = false;
                mProximity = PROXIMITY_UNKNOWN;
                mIgnoreProximityUntilChanged = false;
                mPendingProximity = PROXIMITY_UNKNOWN;
                mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED);
                mSensorManager.unregisterListener(mProximitySensorListener);
                clearPendingProximityDebounceTime(); // release wake lock (must be last)
            }
        }
    }

    private void handleProximitySensorEvent(long time, boolean positive) {
        if (mProximitySensorEnabled) {
            if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) {
                return; // no change
            }
            if (mPendingProximity == PROXIMITY_POSITIVE && positive) {
                return; // no change
            }

            // Only accept a proximity sensor reading if it remains
            // stable for the entire debounce delay.  We hold a wake lock while
            // debouncing the sensor.
            mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED);
            if (positive) {
                mPendingProximity = PROXIMITY_POSITIVE;
                setPendingProximityDebounceTime(
                        time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock
            } else {
                mPendingProximity = PROXIMITY_NEGATIVE;
                setPendingProximityDebounceTime(
                        time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock
            }

            // Debounce the new sensor reading.
            debounceProximitySensor();
        }
    }

    private void debounceProximitySensor() {
        if (mProximitySensorEnabled
                && mPendingProximity != PROXIMITY_UNKNOWN
                && mPendingProximityDebounceTime >= 0) {
            final long now = mClock.uptimeMillis();
            if (mPendingProximityDebounceTime <= now) {
                if (mProximity != mPendingProximity) {
                    // if the status of the sensor changed, stop ignoring.
                    mIgnoreProximityUntilChanged = false;
                    Slog.i(mTag, "No longer ignoring proximity [" + mPendingProximity + "]");
                }
                // Sensor reading accepted.  Apply the change then release the wake lock.
                mProximity = mPendingProximity;
                updatePowerState();
                clearPendingProximityDebounceTime(); // release wake lock (must be last)
            } else {
                // Need to wait a little longer.
                // Debounce again later.  We continue holding a wake lock while waiting.
                Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED);
                mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime);
            }
        }
    }

    private void clearPendingProximityDebounceTime() {
        if (mPendingProximityDebounceTime >= 0) {
            mPendingProximityDebounceTime = -1;
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdProxDebounce);
        }
    }

    private void setPendingProximityDebounceTime(long debounceTime) {
        if (mPendingProximityDebounceTime < 0) {
            mCallbacks.acquireSuspendBlocker(mSuspendBlockerIdProxDebounce);
        }
        mPendingProximityDebounceTime = debounceTime;
    }

    private void sendOnStateChangedWithWakelock() {
        if (!mOnStateChangedPending) {
            mOnStateChangedPending = true;
            mCallbacks.acquireSuspendBlocker(mSuspendBlockerIdOnStateChanged);
            mHandler.post(mOnStateChangedRunnable);
        }
    }

    private void logDisplayPolicyChanged(int newPolicy) {
        LogMaker log = new LogMaker(MetricsEvent.DISPLAY_POLICY);
        log.setType(MetricsEvent.TYPE_UPDATE);
        log.setSubtype(newPolicy);
        MetricsLogger.action(log);
    }

    private void handleSettingsChange(boolean userSwitch) {
        mPendingScreenBrightnessSetting = getScreenBrightnessSetting();
        mPendingAutoBrightnessAdjustment = getAutoBrightnessAdjustmentSetting();
        if (userSwitch) {
            // Don't treat user switches as user initiated change.
            setCurrentScreenBrightness(mPendingScreenBrightnessSetting);
            updateAutoBrightnessAdjustment();
            if (mAutomaticBrightnessController != null) {
                mAutomaticBrightnessController.resetShortTermModel();
            }
        }
        sendUpdatePowerState();
    }

    private void handleBrightnessModeChange() {
        final int screenBrightnessModeSetting = Settings.System.getIntForUser(
                mContext.getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL, UserHandle.USER_CURRENT);
        mHandler.postAtTime(() -> {
            mUseAutoBrightness = screenBrightnessModeSetting
                    == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
            updatePowerState();
        }, mClock.uptimeMillis());
    }

    private float getAutoBrightnessAdjustmentSetting() {
        final float adj = Settings.System.getFloatForUser(mContext.getContentResolver(),
                Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0.0f, UserHandle.USER_CURRENT);
        return Float.isNaN(adj) ? 0.0f : clampAutoBrightnessAdjustment(adj);
    }

    @Override
    public float getScreenBrightnessSetting() {
        float brightness = mBrightnessSetting.getBrightness();
        if (Float.isNaN(brightness)) {
            brightness = mScreenBrightnessDefault;
        }
        return clampAbsoluteBrightness(brightness);
    }

    private void loadNitBasedBrightnessSetting() {
        if (mDisplayId == Display.DEFAULT_DISPLAY && mPersistBrightnessNitsForDefaultDisplay) {
            float brightnessNitsForDefaultDisplay =
                    mBrightnessSetting.getBrightnessNitsForDefaultDisplay();
            if (brightnessNitsForDefaultDisplay >= 0) {
                float brightnessForDefaultDisplay = convertToFloatScale(
                        brightnessNitsForDefaultDisplay);
                if (isValidBrightnessValue(brightnessForDefaultDisplay)) {
                    mBrightnessSetting.setBrightness(brightnessForDefaultDisplay);
                    mCurrentScreenBrightnessSetting = brightnessForDefaultDisplay;
                    return;
                }
            }
        }
        mCurrentScreenBrightnessSetting = getScreenBrightnessSetting();
    }

    @Override
    public void setBrightness(float brightnessValue, int userSerial) {
        // Update the setting, which will eventually call back into DPC to have us actually update
        // the display with the new value.
        mBrightnessSetting.setUserSerial(userSerial);
        mBrightnessSetting.setBrightness(brightnessValue);
        if (mDisplayId == Display.DEFAULT_DISPLAY && mPersistBrightnessNitsForDefaultDisplay) {
            float nits = convertToNits(brightnessValue);
            if (nits >= 0) {
                mBrightnessSetting.setBrightnessNitsForDefaultDisplay(nits);
            }
        }
    }

    @Override
    public void onBootCompleted() {
        Message msg = mHandler.obtainMessage(MSG_BOOT_COMPLETED);
        mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
    }

    private void updateScreenBrightnessSetting(float brightnessValue) {
        if (!isValidBrightnessValue(brightnessValue)
                || brightnessValue == mCurrentScreenBrightnessSetting) {
            return;
        }
        setCurrentScreenBrightness(brightnessValue);
        setBrightness(brightnessValue);
    }

    private void setCurrentScreenBrightness(float brightnessValue) {
        if (brightnessValue != mCurrentScreenBrightnessSetting) {
            mCurrentScreenBrightnessSetting = brightnessValue;
            postBrightnessChangeRunnable();
        }
    }

    private void putAutoBrightnessAdjustmentSetting(float adjustment) {
        if (mDisplayId == Display.DEFAULT_DISPLAY) {
            mAutoBrightnessAdjustment = adjustment;
            Settings.System.putFloatForUser(mContext.getContentResolver(),
                    Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, adjustment,
                    UserHandle.USER_CURRENT);
        }
    }

    private boolean updateAutoBrightnessAdjustment() {
        if (Float.isNaN(mPendingAutoBrightnessAdjustment)) {
            return false;
        }
        if (mAutoBrightnessAdjustment == mPendingAutoBrightnessAdjustment) {
            mPendingAutoBrightnessAdjustment = Float.NaN;
            return false;
        }
        mAutoBrightnessAdjustment = mPendingAutoBrightnessAdjustment;
        mPendingAutoBrightnessAdjustment = Float.NaN;
        mTemporaryAutoBrightnessAdjustment = Float.NaN;
        return true;
    }

    // We want to return true if the user has set the screen brightness.
    // RBC on, off, and intensity changes will return false.
    // Slider interactions whilst in RBC will return true, just as when in non-rbc.
    private boolean updateUserSetScreenBrightness() {
        if ((Float.isNaN(mPendingScreenBrightnessSetting)
                || mPendingScreenBrightnessSetting < 0.0f)) {
            return false;
        }
        if (mCurrentScreenBrightnessSetting == mPendingScreenBrightnessSetting) {
            mPendingScreenBrightnessSetting = PowerManager.BRIGHTNESS_INVALID_FLOAT;
            mTemporaryScreenBrightness = PowerManager.BRIGHTNESS_INVALID_FLOAT;
            return false;
        }
        setCurrentScreenBrightness(mPendingScreenBrightnessSetting);
        mLastUserSetScreenBrightness = mPendingScreenBrightnessSetting;
        mPendingScreenBrightnessSetting = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        mTemporaryScreenBrightness = PowerManager.BRIGHTNESS_INVALID_FLOAT;
        return true;
    }

    private void notifyBrightnessTrackerChanged(float brightness, boolean userInitiated,
            boolean wasShortTermModelActive, boolean autobrightnessEnabled,
            boolean brightnessIsTemporary) {
        final float brightnessInNits = convertToAdjustedNits(brightness);

        // Don't report brightness to brightnessTracker:
        // If brightness is temporary (ie the slider has not been released)
        // or if we are in idle screen brightness mode.
        // or display is not on
        // or we shouldn't be using autobrightness
        // or the nits is invalid.
        if (brightnessIsTemporary
                || mAutomaticBrightnessController == null
                || mAutomaticBrightnessController.isInIdleMode()
                || !autobrightnessEnabled
                || mBrightnessTracker == null
                || !mUseAutoBrightness
                || brightnessInNits < 0.0f) {
            return;
        }

        if (userInitiated && !mAutomaticBrightnessController.hasValidAmbientLux()) {
            // If we don't have a valid lux reading we can't report a valid
            // slider event so notify as if the system changed the brightness.
            userInitiated = false;
        }

        // We only want to track changes on devices that can actually map the display backlight
        // values into a physical brightness unit since the value provided by the API is in
        // nits and not using the arbitrary backlight units.
        final float powerFactor = mPowerRequest.lowPowerMode
                ? mPowerRequest.screenLowPowerBrightnessFactor
                : 1.0f;
        mBrightnessTracker.notifyBrightnessChanged(brightnessInNits, userInitiated,
                powerFactor, wasShortTermModelActive,
                mAutomaticBrightnessController.isDefaultConfig(), mUniqueDisplayId,
                mAutomaticBrightnessController.getLastSensorValues(),
                mAutomaticBrightnessController.getLastSensorTimestamps());
    }

    private float convertToNits(float brightness) {
        if (mAutomaticBrightnessController == null) {
            return -1f;
        }
        return mAutomaticBrightnessController.convertToNits(brightness);
    }

    private float convertToAdjustedNits(float brightness) {
        if (mAutomaticBrightnessController == null) {
            return -1f;
        }
        return mAutomaticBrightnessController.convertToAdjustedNits(brightness);
    }

    private float convertToFloatScale(float nits) {
        if (mAutomaticBrightnessController == null) {
            return PowerManager.BRIGHTNESS_INVALID_FLOAT;
        }
        return mAutomaticBrightnessController.convertToFloatScale(nits);
    }

    @GuardedBy("mLock")
    private void updatePendingProximityRequestsLocked() {
        mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked;
        mPendingWaitForNegativeProximityLocked = false;

        if (mIgnoreProximityUntilChanged) {
            // Also, lets stop waiting for negative proximity if we're ignoring it.
            mWaitingForNegativeProximity = false;
        }
    }

    private void ignoreProximitySensorUntilChangedInternal() {
        if (!mIgnoreProximityUntilChanged
                && mProximity == PROXIMITY_POSITIVE) {
            // Only ignore if it is still reporting positive (near)
            mIgnoreProximityUntilChanged = true;
            Slog.i(mTag, "Ignoring proximity");
            updatePowerState();
        }
    }

    private final Runnable mOnStateChangedRunnable = new Runnable() {
        @Override
        public void run() {
            mOnStateChangedPending = false;
            mCallbacks.onStateChanged();
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdOnStateChanged);
        }
    };

    private void sendOnProximityPositiveWithWakelock() {
        mCallbacks.acquireSuspendBlocker(mSuspendBlockerIdProxPositive);
        mHandler.post(mOnProximityPositiveRunnable);
        mOnProximityPositiveMessages++;
    }

    private final Runnable mOnProximityPositiveRunnable = new Runnable() {
        @Override
        public void run() {
            mOnProximityPositiveMessages--;
            mCallbacks.onProximityPositive();
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdProxPositive);
        }
    };

    private void sendOnProximityNegativeWithWakelock() {
        mOnProximityNegativeMessages++;
        mCallbacks.acquireSuspendBlocker(mSuspendBlockerIdProxNegative);
        mHandler.post(mOnProximityNegativeRunnable);
    }

    private final Runnable mOnProximityNegativeRunnable = new Runnable() {
        @Override
        public void run() {
            mOnProximityNegativeMessages--;
            mCallbacks.onProximityNegative();
            mCallbacks.releaseSuspendBlocker(mSuspendBlockerIdProxNegative);
        }
    };

    /**
     * Indicates whether the display state is ready to update. If this is the default display, we
     * want to update it right away so that we can draw the boot animation on it. If it is not
     * the default display, drawing the boot animation on it would look incorrect, so we need
     * to wait until boot is completed.
     * @return True if the display state is ready to update
     */
    private boolean readyToUpdateDisplayState() {
        return mDisplayId == Display.DEFAULT_DISPLAY || mBootCompleted;
    }

    @Override
    public void dump(final PrintWriter pw) {
        synchronized (mLock) {
            pw.println();
            pw.println("Display Power Controller:");
            pw.println("  mDisplayId=" + mDisplayId);
            pw.println("  mLeadDisplayId=" + mLeadDisplayId);
            pw.println("  mLightSensor=" + mLightSensor);
            pw.println("  mDisplayBrightnessFollowers=" + mDisplayBrightnessFollowers);

            pw.println();
            pw.println("Display Power Controller Locked State:");
            pw.println("  mDisplayReadyLocked=" + mDisplayReadyLocked);
            pw.println("  mPendingRequestLocked=" + mPendingRequestLocked);
            pw.println("  mPendingRequestChangedLocked=" + mPendingRequestChangedLocked);
            pw.println("  mPendingWaitForNegativeProximityLocked="
                    + mPendingWaitForNegativeProximityLocked);
            pw.println("  mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked);
        }

        pw.println();
        pw.println("Display Power Controller Configuration:");
        pw.println("  mScreenBrightnessRangeDefault=" + mScreenBrightnessDefault);
        pw.println("  mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig);
        pw.println("  mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig);
        pw.println("  mUseSoftwareAutoBrightnessConfig=" + mUseSoftwareAutoBrightnessConfig);
        pw.println("  mAllowAutoBrightnessWhileDozingConfig="
                + mAllowAutoBrightnessWhileDozingConfig);
        pw.println("  mPersistBrightnessNitsForDefaultDisplay="
                + mPersistBrightnessNitsForDefaultDisplay);
        pw.println("  mSkipScreenOnBrightnessRamp=" + mSkipScreenOnBrightnessRamp);
        pw.println("  mColorFadeFadesConfig=" + mColorFadeFadesConfig);
        pw.println("  mColorFadeEnabled=" + mColorFadeEnabled);
        synchronized (mCachedBrightnessInfo) {
            pw.println("  mCachedBrightnessInfo.brightness="
                    + mCachedBrightnessInfo.brightness.value);
            pw.println("  mCachedBrightnessInfo.adjustedBrightness="
                    + mCachedBrightnessInfo.adjustedBrightness.value);
            pw.println("  mCachedBrightnessInfo.brightnessMin="
                    + mCachedBrightnessInfo.brightnessMin.value);
            pw.println("  mCachedBrightnessInfo.brightnessMax="
                    + mCachedBrightnessInfo.brightnessMax.value);
            pw.println("  mCachedBrightnessInfo.hbmMode=" + mCachedBrightnessInfo.hbmMode.value);
            pw.println("  mCachedBrightnessInfo.hbmTransitionPoint="
                    + mCachedBrightnessInfo.hbmTransitionPoint.value);
            pw.println("  mCachedBrightnessInfo.brightnessMaxReason ="
                    + mCachedBrightnessInfo.brightnessMaxReason.value);
        }
        pw.println("  mDisplayBlanksAfterDozeConfig=" + mDisplayBlanksAfterDozeConfig);
        pw.println("  mBrightnessBucketsInDozeConfig=" + mBrightnessBucketsInDozeConfig);

        mHandler.runWithScissors(() -> dumpLocal(pw), 1000);
    }

    private void dumpLocal(PrintWriter pw) {
        pw.println();
        pw.println("Display Power Controller Thread State:");
        pw.println("  mPowerRequest=" + mPowerRequest);
        pw.println("  mUnfinishedBusiness=" + mUnfinishedBusiness);
        pw.println("  mWaitingForNegativeProximity=" + mWaitingForNegativeProximity);
        pw.println("  mProximitySensor=" + mProximitySensor);
        pw.println("  mProximitySensorEnabled=" + mProximitySensorEnabled);
        pw.println("  mProximityThreshold=" + mProximityThreshold);
        pw.println("  mProximity=" + proximityToString(mProximity));
        pw.println("  mPendingProximity=" + proximityToString(mPendingProximity));
        pw.println("  mPendingProximityDebounceTime="
                + TimeUtils.formatUptime(mPendingProximityDebounceTime));
        pw.println("  mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity);
        pw.println("  mLastUserSetScreenBrightness=" + mLastUserSetScreenBrightness);
        pw.println("  mPendingScreenBrightnessSetting="
                + mPendingScreenBrightnessSetting);
        pw.println("  mTemporaryScreenBrightness=" + mTemporaryScreenBrightness);
        pw.println("  mBrightnessToFollow=" + mBrightnessToFollow);
        pw.println("  mBrightnessToFollowSlowChange=" + mBrightnessToFollowSlowChange);
        pw.println("  mAutoBrightnessAdjustment=" + mAutoBrightnessAdjustment);
        pw.println("  mBrightnessReason=" + mBrightnessReason);
        pw.println("  mTemporaryAutoBrightnessAdjustment=" + mTemporaryAutoBrightnessAdjustment);
        pw.println("  mPendingAutoBrightnessAdjustment=" + mPendingAutoBrightnessAdjustment);
        pw.println("  mAppliedAutoBrightness=" + mAppliedAutoBrightness);
        pw.println("  mAppliedDimming=" + mAppliedDimming);
        pw.println("  mAppliedLowPower=" + mAppliedLowPower);
        pw.println("  mAppliedThrottling=" + mAppliedThrottling);
        pw.println("  mAppliedScreenBrightnessOverride=" + mAppliedScreenBrightnessOverride);
        pw.println("  mAppliedTemporaryBrightness=" + mAppliedTemporaryBrightness);
        pw.println("  mAppliedTemporaryAutoBrightnessAdjustment="
                + mAppliedTemporaryAutoBrightnessAdjustment);
        pw.println("  mAppliedBrightnessBoost=" + mAppliedBrightnessBoost);
        pw.println("  mDozing=" + mDozing);
        pw.println("  mSkipRampState=" + skipRampStateToString(mSkipRampState));
        pw.println("  mScreenOnBlockStartRealTime=" + mScreenOnBlockStartRealTime);
        pw.println("  mScreenOffBlockStartRealTime=" + mScreenOffBlockStartRealTime);
        pw.println("  mPendingScreenOnUnblocker=" + mPendingScreenOnUnblocker);
        pw.println("  mPendingScreenOffUnblocker=" + mPendingScreenOffUnblocker);
        pw.println("  mPendingScreenOff=" + mPendingScreenOff);
        pw.println("  mReportedToPolicy="
                + reportedToPolicyToString(mReportedScreenStateToPolicy));
        pw.println("  mIsRbcActive=" + mIsRbcActive);
        pw.println("  mOnStateChangePending=" + mOnStateChangedPending);
        pw.println("  mOnProximityPositiveMessages=" + mOnProximityPositiveMessages);
        pw.println("  mOnProximityNegativeMessages=" + mOnProximityNegativeMessages);

        if (mScreenBrightnessRampAnimator != null) {
            pw.println("  mScreenBrightnessRampAnimator.isAnimating()="
                    + mScreenBrightnessRampAnimator.isAnimating());
        }

        if (mColorFadeOnAnimator != null) {
            pw.println("  mColorFadeOnAnimator.isStarted()="
                    + mColorFadeOnAnimator.isStarted());
        }
        if (mColorFadeOffAnimator != null) {
            pw.println("  mColorFadeOffAnimator.isStarted()="
                    + mColorFadeOffAnimator.isStarted());
        }

        if (mPowerState != null) {
            mPowerState.dump(pw);
        }

        if (mAutomaticBrightnessController != null) {
            mAutomaticBrightnessController.dump(pw);
            dumpBrightnessEvents(pw);
        }

        if (mScreenOffBrightnessSensorController != null) {
            mScreenOffBrightnessSensorController.dump(pw);
        }

        if (mBrightnessRangeController != null) {
            mBrightnessRangeController.dump(pw);
        }

        if (mBrightnessThrottler != null) {
            mBrightnessThrottler.dump(pw);
        }

        pw.println();
        if (mDisplayWhiteBalanceController != null) {
            mDisplayWhiteBalanceController.dump(pw);
            mDisplayWhiteBalanceSettings.dump(pw);
        }
    }

    private static String proximityToString(int state) {
        switch (state) {
            case PROXIMITY_UNKNOWN:
                return "Unknown";
            case PROXIMITY_NEGATIVE:
                return "Negative";
            case PROXIMITY_POSITIVE:
                return "Positive";
            default:
                return Integer.toString(state);
        }
    }

    private static String reportedToPolicyToString(int state) {
        switch (state) {
            case REPORTED_TO_POLICY_SCREEN_OFF:
                return "REPORTED_TO_POLICY_SCREEN_OFF";
            case REPORTED_TO_POLICY_SCREEN_TURNING_ON:
                return "REPORTED_TO_POLICY_SCREEN_TURNING_ON";
            case REPORTED_TO_POLICY_SCREEN_ON:
                return "REPORTED_TO_POLICY_SCREEN_ON";
            default:
                return Integer.toString(state);
        }
    }

    private static String skipRampStateToString(int state) {
        switch (state) {
            case RAMP_STATE_SKIP_NONE:
                return "RAMP_STATE_SKIP_NONE";
            case RAMP_STATE_SKIP_INITIAL:
                return "RAMP_STATE_SKIP_INITIAL";
            case RAMP_STATE_SKIP_AUTOBRIGHT:
                return "RAMP_STATE_SKIP_AUTOBRIGHT";
            default:
                return Integer.toString(state);
        }
    }

    private void dumpBrightnessEvents(PrintWriter pw) {
        int size = mBrightnessEventRingBuffer.size();
        if (size < 1) {
            pw.println("No Automatic Brightness Adjustments");
            return;
        }

        pw.println("Automatic Brightness Adjustments Last " + size + " Events: ");
        BrightnessEvent[] eventArray = mBrightnessEventRingBuffer.toArray();
        for (int i = 0; i < mBrightnessEventRingBuffer.size(); i++) {
            pw.println("  " + eventArray[i].toString());
        }
    }

    private static float clampAbsoluteBrightness(float value) {
        return MathUtils.constrain(value, PowerManager.BRIGHTNESS_MIN,
                PowerManager.BRIGHTNESS_MAX);
    }

    private static float clampAutoBrightnessAdjustment(float value) {
        return MathUtils.constrain(value, -1.0f, 1.0f);
    }

    private void noteScreenState(int screenState) {
        // Log screen state change with display id
        FrameworkStatsLog.write(FrameworkStatsLog.SCREEN_STATE_CHANGED_V2,
                screenState, mDisplayStatsId);
        if (mBatteryStats != null) {
            try {
                // TODO(multi-display): make this multi-display
                mBatteryStats.noteScreenState(screenState);
            } catch (RemoteException e) {
                // same process
            }
        }
    }

    private void noteScreenBrightness(float brightness) {
        if (mBatteryStats != null) {
            try {
                // TODO(brightnessfloat): change BatteryStats to use float
                mBatteryStats.noteScreenBrightness(BrightnessSynchronizer.brightnessFloatToInt(
                        brightness));
            } catch (RemoteException e) {
                // same process
            }
        }
    }

    private void reportStats(float brightness) {
        if (mLastStatsBrightness == brightness) {
            return;
        }

        float hbmTransitionPoint = PowerManager.BRIGHTNESS_MAX;
        synchronized (mCachedBrightnessInfo) {
            if (mCachedBrightnessInfo.hbmTransitionPoint == null) {
                return;
            }
            hbmTransitionPoint = mCachedBrightnessInfo.hbmTransitionPoint.value;
        }

        final boolean aboveTransition = brightness > hbmTransitionPoint;
        final boolean oldAboveTransition = mLastStatsBrightness > hbmTransitionPoint;

        if (aboveTransition || oldAboveTransition) {
            mLastStatsBrightness = brightness;
            mHandler.removeMessages(MSG_STATSD_HBM_BRIGHTNESS);
            if (aboveTransition != oldAboveTransition) {
                // report immediately
                logHbmBrightnessStats(brightness, mDisplayStatsId);
            } else {
                // delay for rate limiting
                Message msg = mHandler.obtainMessage();
                msg.what = MSG_STATSD_HBM_BRIGHTNESS;
                msg.arg1 = Float.floatToIntBits(brightness);
                msg.arg2 = mDisplayStatsId;
                mHandler.sendMessageAtTime(msg, mClock.uptimeMillis()
                        + BRIGHTNESS_CHANGE_STATSD_REPORT_INTERVAL_MS);
            }
        }
    }

    private void logHbmBrightnessStats(float brightness, int displayStatsId) {
        synchronized (mHandler) {
            FrameworkStatsLog.write(
                    FrameworkStatsLog.DISPLAY_HBM_BRIGHTNESS_CHANGED, displayStatsId, brightness);
        }
    }

    // Return bucket index of range_[left]_[right] where
    // left <= nits < right
    private int nitsToRangeIndex(float nits) {
        for (int i = 0; i < BRIGHTNESS_RANGE_BOUNDARIES.length; i++) {
            if (nits < BRIGHTNESS_RANGE_BOUNDARIES[i]) {
                return BRIGHTNESS_RANGE_INDEX[i];
            }
        }
        return FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__BUCKET_INDEX__RANGE_3000_INF;
    }

    private int convertBrightnessReasonToStatsEnum(int brightnessReason) {
        switch(brightnessReason) {
            case BrightnessReason.REASON_UNKNOWN:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_UNKNOWN;
            case BrightnessReason.REASON_MANUAL:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_MANUAL;
            case BrightnessReason.REASON_DOZE:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_DOZE;
            case BrightnessReason.REASON_DOZE_DEFAULT:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_DOZE_DEFAULT;
            case BrightnessReason.REASON_AUTOMATIC:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_AUTOMATIC;
            case BrightnessReason.REASON_SCREEN_OFF:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_SCREEN_OFF;
            case BrightnessReason.REASON_OVERRIDE:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_OVERRIDE;
            case BrightnessReason.REASON_TEMPORARY:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_TEMPORARY;
            case BrightnessReason.REASON_BOOST:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_BOOST;
            case BrightnessReason.REASON_SCREEN_OFF_BRIGHTNESS_SENSOR:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_SCREEN_OFF_BRIGHTNESS_SENSOR;
            case BrightnessReason.REASON_FOLLOWER:
                return FrameworkStatsLog
                    .DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_FOLLOWER;
        }
        return FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__ENTIRE_REASON__REASON_UNKNOWN;
    }

    private void logBrightnessEvent(BrightnessEvent event, float unmodifiedBrightness) {
        int modifier = event.getReason().getModifier();
        int flags = event.getFlags();
        // It's easier to check if the brightness is at maximum level using the brightness
        // value untouched by any modifiers
        boolean brightnessIsMax = unmodifiedBrightness == event.getHbmMax();
        float brightnessInNits = convertToAdjustedNits(event.getBrightness());
        float appliedLowPowerMode = event.isLowPowerModeSet() ? event.getPowerFactor() : -1f;
        int appliedRbcStrength  = event.isRbcEnabled() ? event.getRbcStrength() : -1;
        float appliedHbmMaxNits =
                event.getHbmMode() == BrightnessInfo.HIGH_BRIGHTNESS_MODE_OFF
                ? -1f : convertToAdjustedNits(event.getHbmMax());
        // thermalCapNits set to -1 if not currently capping max brightness
        float appliedThermalCapNits =
                event.getThermalMax() == PowerManager.BRIGHTNESS_MAX
                ? -1f : convertToAdjustedNits(event.getThermalMax());

        if (mIsDisplayInternal) {
            FrameworkStatsLog.write(FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED,
                    convertToAdjustedNits(event.getInitialBrightness()),
                    brightnessInNits,
                    event.getLux(),
                    event.getPhysicalDisplayId(),
                    event.wasShortTermModelActive(),
                    appliedLowPowerMode,
                    appliedRbcStrength,
                    appliedHbmMaxNits,
                    appliedThermalCapNits,
                    event.isAutomaticBrightnessEnabled(),
                    FrameworkStatsLog.DISPLAY_BRIGHTNESS_CHANGED__REASON__REASON_MANUAL,
                    convertBrightnessReasonToStatsEnum(event.getReason().getReason()),
                    nitsToRangeIndex(brightnessInNits),
                    brightnessIsMax,
                    event.getHbmMode() == BrightnessInfo.HIGH_BRIGHTNESS_MODE_SUNLIGHT,
                    event.getHbmMode() == BrightnessInfo.HIGH_BRIGHTNESS_MODE_HDR,
                    (modifier & BrightnessReason.MODIFIER_LOW_POWER) > 0,
                    mBrightnessThrottler.getBrightnessMaxReason(),
                    (modifier & BrightnessReason.MODIFIER_DIMMED) > 0,
                    event.isRbcEnabled(),
                    (flags & BrightnessEvent.FLAG_INVALID_LUX) > 0,
                    (flags & BrightnessEvent.FLAG_DOZE_SCALE) > 0,
                    (flags & BrightnessEvent.FLAG_USER_SET) > 0,
                    (flags & BrightnessEvent.FLAG_IDLE_CURVE) > 0,
                    (flags & BrightnessEvent.FLAG_LOW_POWER_MODE) > 0);
        }
    }

    private final class DisplayControllerHandler extends Handler {
        DisplayControllerHandler(Looper looper) {
            super(looper, null, true /*async*/);
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_UPDATE_POWER_STATE:
                    updatePowerState();
                    break;

                case MSG_PROXIMITY_SENSOR_DEBOUNCED:
                    debounceProximitySensor();
                    break;

                case MSG_SCREEN_ON_UNBLOCKED:
                    if (mPendingScreenOnUnblocker == msg.obj) {
                        unblockScreenOn();
                        updatePowerState();
                    }
                    break;
                case MSG_SCREEN_OFF_UNBLOCKED:
                    if (mPendingScreenOffUnblocker == msg.obj) {
                        unblockScreenOff();
                        updatePowerState();
                    }
                    break;
                case MSG_CONFIGURE_BRIGHTNESS:
                    mBrightnessConfiguration = (BrightnessConfiguration) msg.obj;
                    mShouldResetShortTermModel = msg.arg1 == 1;
                    updatePowerState();
                    break;

                case MSG_SET_TEMPORARY_BRIGHTNESS:
                    // TODO: Should we have a a timeout for the temporary brightness?
                    mTemporaryScreenBrightness = Float.intBitsToFloat(msg.arg1);
                    updatePowerState();
                    break;

                case MSG_SET_TEMPORARY_AUTO_BRIGHTNESS_ADJUSTMENT:
                    mTemporaryAutoBrightnessAdjustment = Float.intBitsToFloat(msg.arg1);
                    updatePowerState();
                    break;

                case MSG_IGNORE_PROXIMITY:
                    ignoreProximitySensorUntilChangedInternal();
                    break;

                case MSG_STOP:
                    cleanupHandlerThreadAfterStop();
                    break;

                case MSG_UPDATE_BRIGHTNESS:
                    if (mStopped) {
                        return;
                    }
                    handleSettingsChange(false /*userSwitch*/);
                    break;

                case MSG_UPDATE_RBC:
                    handleRbcChanged();
                    break;

                case MSG_BRIGHTNESS_RAMP_DONE:
                    if (mPowerState != null) {
                        final float brightness = mPowerState.getScreenBrightness();
                        reportStats(brightness);
                    }
                    break;

                case MSG_STATSD_HBM_BRIGHTNESS:
                    logHbmBrightnessStats(Float.intBitsToFloat(msg.arg1), msg.arg2);
                    break;

                case MSG_SWITCH_USER:
                    handleOnSwitchUser(msg.arg1);
                    break;

                case MSG_BOOT_COMPLETED:
                    mBootCompleted = true;
                    updatePowerState();
                    break;

                case MSG_SET_DWBC_STRONG_MODE:
                    setDwbcStrongMode(msg.arg1);
                    break;

                case MSG_SET_DWBC_COLOR_OVERRIDE:
                    final float cct = Float.intBitsToFloat(msg.arg1);
                    setDwbcOverride(cct);
                    break;

                case MSG_SET_DWBC_LOGGING_ENABLED:
                    setDwbcLoggingEnabled(msg.arg1);
                    break;
            }
        }
    }

    private final SensorEventListener mProximitySensorListener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent event) {
            if (mProximitySensorEnabled) {
                final long time = mClock.uptimeMillis();
                final float distance = event.values[0];
                boolean positive = distance >= 0.0f && distance < mProximityThreshold;
                handleProximitySensorEvent(time, positive);
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            // Not used.
        }
    };


    private final class SettingsObserver extends ContentObserver {
        SettingsObserver(Handler handler) {
            super(handler);
        }

        @Override
        public void onChange(boolean selfChange, Uri uri) {
            if (uri.equals(Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE))) {
                handleBrightnessModeChange();
            } else {
                handleSettingsChange(false /* userSwitch */);
            }
        }
    }

    private final class ScreenOnUnblocker implements WindowManagerPolicy.ScreenOnListener {
        @Override
        public void onScreenOn() {
            Message msg = mHandler.obtainMessage(MSG_SCREEN_ON_UNBLOCKED, this);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
        }
    }

    private final class ScreenOffUnblocker implements WindowManagerPolicy.ScreenOffListener {
        @Override
        public void onScreenOff() {
            Message msg = mHandler.obtainMessage(MSG_SCREEN_OFF_UNBLOCKED, this);
            mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
        }
    }

    @Override
    public void setAutoBrightnessLoggingEnabled(boolean enabled) {
        if (mAutomaticBrightnessController != null) {
            mAutomaticBrightnessController.setLoggingEnabled(enabled);
        }
    }

    @Override // DisplayWhiteBalanceController.Callbacks
    public void updateWhiteBalance() {
        sendUpdatePowerState();
    }

    @Override
    public void setDisplayWhiteBalanceLoggingEnabled(boolean enabled) {
        Message msg = mHandler.obtainMessage();
        msg.what = MSG_SET_DWBC_LOGGING_ENABLED;
        msg.arg1 = enabled ? 1 : 0;
        msg.sendToTarget();
    }

    @Override
    public void setAmbientColorTemperatureOverride(float cct) {
        Message msg = mHandler.obtainMessage();
        msg.what = MSG_SET_DWBC_COLOR_OVERRIDE;
        msg.arg1 = Float.floatToIntBits(cct);
        msg.sendToTarget();
    }

    @VisibleForTesting
    String getSuspendBlockerUnfinishedBusinessId(int displayId) {
        return "[" + displayId + "]unfinished business";
    }

    String getSuspendBlockerOnStateChangedId(int displayId) {
        return "[" + displayId + "]on state changed";
    }

    String getSuspendBlockerProxPositiveId(int displayId) {
        return "[" + displayId + "]prox positive";
    }

    String getSuspendBlockerProxNegativeId(int displayId) {
        return "[" + displayId + "]prox negative";
    }

    @VisibleForTesting
    String getSuspendBlockerProxDebounceId(int displayId) {
        return "[" + displayId + "]prox debounce";
    }

    /** Functional interface for providing time. */
    @VisibleForTesting
    interface Clock {
        /**
         * Returns current time in milliseconds since boot, not counting time spent in deep sleep.
         */
        long uptimeMillis();
    }

    @VisibleForTesting
    static class Injector {
        Clock getClock() {
            return SystemClock::uptimeMillis;
        }

        DisplayPowerState getDisplayPowerState(DisplayBlanker blanker, ColorFade colorFade,
                int displayId, int displayState) {
            return new DisplayPowerState(blanker, colorFade, displayId, displayState);
        }

        DualRampAnimator<DisplayPowerState> getDualRampAnimator(DisplayPowerState dps,
                FloatProperty<DisplayPowerState> firstProperty,
                FloatProperty<DisplayPowerState> secondProperty) {
            return new DualRampAnimator(dps, firstProperty, secondProperty);
        }

        AutomaticBrightnessController getAutomaticBrightnessController(
                AutomaticBrightnessController.Callbacks callbacks, Looper looper,
                SensorManager sensorManager, Sensor lightSensor,
                BrightnessMappingStrategy interactiveModeBrightnessMapper,
                int lightSensorWarmUpTime, float brightnessMin, float brightnessMax,
                float dozeScaleFactor, int lightSensorRate, int initialLightSensorRate,
                long brighteningLightDebounceConfig, long darkeningLightDebounceConfig,
                boolean resetAmbientLuxAfterWarmUpConfig,
                HysteresisLevels ambientBrightnessThresholds,
                HysteresisLevels screenBrightnessThresholds,
                HysteresisLevels ambientBrightnessThresholdsIdle,
                HysteresisLevels screenBrightnessThresholdsIdle, Context context,
                BrightnessRangeController brightnessRangeController,
                BrightnessThrottler brightnessThrottler,
                BrightnessMappingStrategy idleModeBrightnessMapper, int ambientLightHorizonShort,
                int ambientLightHorizonLong, float userLux, float userBrightness) {
            return new AutomaticBrightnessController(callbacks, looper, sensorManager, lightSensor,
                    interactiveModeBrightnessMapper, lightSensorWarmUpTime, brightnessMin,
                    brightnessMax, dozeScaleFactor, lightSensorRate, initialLightSensorRate,
                    brighteningLightDebounceConfig, darkeningLightDebounceConfig,
                    resetAmbientLuxAfterWarmUpConfig, ambientBrightnessThresholds,
                    screenBrightnessThresholds, ambientBrightnessThresholdsIdle,
                    screenBrightnessThresholdsIdle, context, brightnessRangeController,
                    brightnessThrottler, idleModeBrightnessMapper, ambientLightHorizonShort,
                    ambientLightHorizonLong, userLux, userBrightness);
        }

        BrightnessMappingStrategy getInteractiveModeBrightnessMapper(Resources resources,
                DisplayDeviceConfig displayDeviceConfig,
                DisplayWhiteBalanceController displayWhiteBalanceController) {
            return BrightnessMappingStrategy.create(resources,
                    displayDeviceConfig, displayWhiteBalanceController);
        }

        HysteresisLevels getHysteresisLevels(float[] brighteningThresholdsPercentages,
                float[] darkeningThresholdsPercentages, float[] brighteningThresholdLevels,
                float[] darkeningThresholdLevels, float minDarkeningThreshold,
                float minBrighteningThreshold) {
            return new HysteresisLevels(brighteningThresholdsPercentages,
                    darkeningThresholdsPercentages, brighteningThresholdLevels,
                    darkeningThresholdLevels, minDarkeningThreshold, minBrighteningThreshold);
        }

        HysteresisLevels getHysteresisLevels(float[] brighteningThresholdsPercentages,
                float[] darkeningThresholdsPercentages, float[] brighteningThresholdLevels,
                float[] darkeningThresholdLevels, float minDarkeningThreshold,
                float minBrighteningThreshold, boolean potentialOldBrightnessRange) {
            return new HysteresisLevels(brighteningThresholdsPercentages,
                    darkeningThresholdsPercentages, brighteningThresholdLevels,
                    darkeningThresholdLevels, minDarkeningThreshold, minBrighteningThreshold,
                    potentialOldBrightnessRange);
        }

        ScreenOffBrightnessSensorController getScreenOffBrightnessSensorController(
                SensorManager sensorManager,
                Sensor lightSensor,
                Handler handler,
                ScreenOffBrightnessSensorController.Clock clock,
                int[] sensorValueToLux,
                BrightnessMappingStrategy brightnessMapper) {
            return new ScreenOffBrightnessSensorController(
                    sensorManager,
                    lightSensor,
                    handler,
                    clock,
                    sensorValueToLux,
                    brightnessMapper
            );
        }

        HighBrightnessModeController getHighBrightnessModeController(Handler handler, int width,
                int height, IBinder displayToken, String displayUniqueId, float brightnessMin,
                float brightnessMax, DisplayDeviceConfig.HighBrightnessModeData hbmData,
                HighBrightnessModeController.HdrBrightnessDeviceConfig hdrBrightnessCfg,
                Runnable hbmChangeCallback, HighBrightnessModeMetadata hbmMetadata,
                Context context) {
            return new HighBrightnessModeController(handler, width, height, displayToken,
                    displayUniqueId, brightnessMin, brightnessMax, hbmData, hdrBrightnessCfg,
                    hbmChangeCallback, hbmMetadata, context);
        }

        DisplayWhiteBalanceController getDisplayWhiteBalanceController(Handler handler,
                SensorManager sensorManager, Resources resources) {
            return DisplayWhiteBalanceFactory.create(handler,
                    sensorManager, resources);
        }
    }

    static class CachedBrightnessInfo {
        public MutableFloat brightness = new MutableFloat(PowerManager.BRIGHTNESS_INVALID_FLOAT);
        public MutableFloat adjustedBrightness =
                new MutableFloat(PowerManager.BRIGHTNESS_INVALID_FLOAT);
        public MutableFloat brightnessMin =
                new MutableFloat(PowerManager.BRIGHTNESS_INVALID_FLOAT);
        public MutableFloat brightnessMax =
                new MutableFloat(PowerManager.BRIGHTNESS_INVALID_FLOAT);
        public MutableInt hbmMode = new MutableInt(BrightnessInfo.HIGH_BRIGHTNESS_MODE_OFF);
        public MutableFloat hbmTransitionPoint =
                new MutableFloat(HighBrightnessModeController.HBM_TRANSITION_POINT_INVALID);
        public MutableInt brightnessMaxReason =
                new MutableInt(BrightnessInfo.BRIGHTNESS_MAX_REASON_NONE);

        public boolean checkAndSetFloat(MutableFloat mf, float f) {
            if (mf.value != f) {
                mf.value = f;
                return true;
            }
            return false;
        }

        public boolean checkAndSetInt(MutableInt mi, int i) {
            if (mi.value != i) {
                mi.value = i;
                return true;
            }
            return false;
        }
    }
}