DisplayPowerController.java revision 01ee6f6cf7de9fb98fc3a88509b43416caa71040
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.display; 18 19import com.android.internal.app.IBatteryStats; 20import com.android.server.LocalServices; 21import com.android.server.am.BatteryStatsService; 22import com.android.server.lights.LightsManager; 23import com.android.server.twilight.TwilightListener; 24import com.android.server.twilight.TwilightManager; 25import com.android.server.twilight.TwilightState; 26 27import android.animation.Animator; 28import android.animation.ObjectAnimator; 29import android.content.Context; 30import android.content.res.Resources; 31import android.hardware.Sensor; 32import android.hardware.SensorEvent; 33import android.hardware.SensorEventListener; 34import android.hardware.SensorManager; 35import android.hardware.display.DisplayManagerInternal.DisplayPowerCallbacks; 36import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 37import android.os.Handler; 38import android.os.Looper; 39import android.os.Message; 40import android.os.PowerManager; 41import android.os.RemoteException; 42import android.os.SystemClock; 43import android.text.format.DateUtils; 44import android.util.FloatMath; 45import android.util.Slog; 46import android.util.Spline; 47import android.util.TimeUtils; 48import android.view.Display; 49 50import java.io.PrintWriter; 51 52/** 53 * Controls the power state of the display. 54 * 55 * Handles the proximity sensor, light sensor, and animations between states 56 * including the screen off animation. 57 * 58 * This component acts independently of the rest of the power manager service. 59 * In particular, it does not share any state and it only communicates 60 * via asynchronous callbacks to inform the power manager that something has 61 * changed. 62 * 63 * Everything this class does internally is serialized on its handler although 64 * it may be accessed by other threads from the outside. 65 * 66 * Note that the power manager service guarantees that it will hold a suspend 67 * blocker as long as the display is not ready. So most of the work done here 68 * does not need to worry about holding a suspend blocker unless it happens 69 * independently of the display ready signal. 70 * 71 * For debugging, you can make the electron beam and brightness animations run 72 * slower by changing the "animator duration scale" option in Development Settings. 73 */ 74final class DisplayPowerController { 75 private static final String TAG = "DisplayPowerController"; 76 77 private static boolean DEBUG = false; 78 private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false; 79 private static final boolean DEBUG_PRETEND_LIGHT_SENSOR_ABSENT = false; 80 81 // If true, uses the electron beam on animation. 82 // We might want to turn this off if we cannot get a guarantee that the screen 83 // actually turns on and starts showing new content after the call to set the 84 // screen state returns. Playing the animation can also be somewhat slow. 85 private static final boolean USE_ELECTRON_BEAM_ON_ANIMATION = false; 86 87 // If true, enables the use of the screen auto-brightness adjustment setting. 88 private static final boolean USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT = 89 PowerManager.useScreenAutoBrightnessAdjustmentFeature(); 90 91 // The maximum range of gamma adjustment possible using the screen 92 // auto-brightness adjustment setting. 93 private static final float SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA = 3.0f; 94 95 // The minimum reduction in brightness when dimmed. 96 private static final int SCREEN_DIM_MINIMUM_REDUCTION = 10; 97 98 // If true, enables the use of the current time as an auto-brightness adjustment. 99 // The basic idea here is to expand the dynamic range of auto-brightness 100 // when it is especially dark outside. The light sensor tends to perform 101 // poorly at low light levels so we compensate for it by making an 102 // assumption about the environment. 103 private static final boolean USE_TWILIGHT_ADJUSTMENT = 104 PowerManager.useTwilightAdjustmentFeature(); 105 106 // Specifies the maximum magnitude of the time of day adjustment. 107 private static final float TWILIGHT_ADJUSTMENT_MAX_GAMMA = 1.5f; 108 109 // The amount of time after or before sunrise over which to start adjusting 110 // the gamma. We want the change to happen gradually so that it is below the 111 // threshold of perceptibility and so that the adjustment has maximum effect 112 // well after dusk. 113 private static final long TWILIGHT_ADJUSTMENT_TIME = DateUtils.HOUR_IN_MILLIS * 2; 114 115 private static final int ELECTRON_BEAM_ON_ANIMATION_DURATION_MILLIS = 250; 116 private static final int ELECTRON_BEAM_OFF_ANIMATION_DURATION_MILLIS = 400; 117 118 private static final int MSG_UPDATE_POWER_STATE = 1; 119 private static final int MSG_PROXIMITY_SENSOR_DEBOUNCED = 2; 120 private static final int MSG_LIGHT_SENSOR_DEBOUNCED = 3; 121 122 private static final int PROXIMITY_UNKNOWN = -1; 123 private static final int PROXIMITY_NEGATIVE = 0; 124 private static final int PROXIMITY_POSITIVE = 1; 125 126 // Proximity sensor debounce delay in milliseconds for positive or negative transitions. 127 private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0; 128 private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250; 129 130 // Trigger proximity if distance is less than 5 cm. 131 private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f; 132 133 // Light sensor event rate in milliseconds. 134 private static final int LIGHT_SENSOR_RATE_MILLIS = 1000; 135 136 // A rate for generating synthetic light sensor events in the case where the light 137 // sensor hasn't reported any new data in a while and we need it to update the 138 // debounce filter. We only synthesize light sensor measurements when needed. 139 private static final int SYNTHETIC_LIGHT_SENSOR_RATE_MILLIS = 140 LIGHT_SENSOR_RATE_MILLIS * 2; 141 142 // Brightness animation ramp rate in brightness units per second. 143 private static final int BRIGHTNESS_RAMP_RATE_FAST = 200; 144 private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40; 145 146 // IIR filter time constants in milliseconds for computing two moving averages of 147 // the light samples. One is a long-term average and the other is a short-term average. 148 // We can use these filters to assess trends in ambient brightness. 149 // The short term average gives us a filtered but relatively low latency measurement. 150 // The long term average informs us about the overall trend. 151 private static final long SHORT_TERM_AVERAGE_LIGHT_TIME_CONSTANT = 1000; 152 private static final long LONG_TERM_AVERAGE_LIGHT_TIME_CONSTANT = 5000; 153 154 // Stability requirements in milliseconds for accepting a new brightness 155 // level. This is used for debouncing the light sensor. Different constants 156 // are used to debounce the light sensor when adapting to brighter or darker environments. 157 // This parameter controls how quickly brightness changes occur in response to 158 // an observed change in light level that exceeds the hysteresis threshold. 159 private static final long BRIGHTENING_LIGHT_DEBOUNCE = 4000; 160 private static final long DARKENING_LIGHT_DEBOUNCE = 8000; 161 162 // Hysteresis constraints for brightening or darkening. 163 // The recent lux must have changed by at least this fraction relative to the 164 // current ambient lux before a change will be considered. 165 private static final float BRIGHTENING_LIGHT_HYSTERESIS = 0.10f; 166 private static final float DARKENING_LIGHT_HYSTERESIS = 0.20f; 167 168 private final Object mLock = new Object(); 169 170 // Our handler. 171 private final DisplayControllerHandler mHandler; 172 173 // Asynchronous callbacks into the power manager service. 174 // Only invoked from the handler thread while no locks are held. 175 private final DisplayPowerCallbacks mCallbacks; 176 177 // Battery stats. 178 private final IBatteryStats mBatteryStats; 179 180 // The lights service. 181 private final LightsManager mLights; 182 183 // The twilight service. 184 private final TwilightManager mTwilight; 185 186 // The sensor manager. 187 private final SensorManager mSensorManager; 188 189 // The display blanker. 190 private final DisplayBlanker mBlanker; 191 192 // The proximity sensor, or null if not available or needed. 193 private Sensor mProximitySensor; 194 195 // The light sensor, or null if not available or needed. 196 private Sensor mLightSensor; 197 198 // The doze screen brightness. 199 private final int mScreenBrightnessDozeConfig; 200 201 // The dim screen brightness. 202 private final int mScreenBrightnessDimConfig; 203 204 // The minimum allowed brightness. 205 private final int mScreenBrightnessRangeMinimum; 206 207 // The maximum allowed brightness. 208 private final int mScreenBrightnessRangeMaximum; 209 210 // True if auto-brightness should be used. 211 private boolean mUseSoftwareAutoBrightnessConfig; 212 213 // The auto-brightness spline adjustment. 214 // The brightness values have been scaled to a range of 0..1. 215 private Spline mScreenAutoBrightnessSpline; 216 217 // Amount of time to delay auto-brightness after screen on while waiting for 218 // the light sensor to warm-up in milliseconds. 219 // May be 0 if no warm-up is required. 220 private int mLightSensorWarmUpTimeConfig; 221 222 // True if we should fade the screen while turning it off, false if we should play 223 // a stylish electron beam animation instead. 224 private boolean mElectronBeamFadesConfig; 225 226 // The pending power request. 227 // Initially null until the first call to requestPowerState. 228 // Guarded by mLock. 229 private DisplayPowerRequest mPendingRequestLocked; 230 231 // True if a request has been made to wait for the proximity sensor to go negative. 232 // Guarded by mLock. 233 private boolean mPendingWaitForNegativeProximityLocked; 234 235 // True if the pending power request or wait for negative proximity flag 236 // has been changed since the last update occurred. 237 // Guarded by mLock. 238 private boolean mPendingRequestChangedLocked; 239 240 // Set to true when the important parts of the pending power request have been applied. 241 // The important parts are mainly the screen state. Brightness changes may occur 242 // concurrently. 243 // Guarded by mLock. 244 private boolean mDisplayReadyLocked; 245 246 // Set to true if a power state update is required. 247 // Guarded by mLock. 248 private boolean mPendingUpdatePowerStateLocked; 249 250 /* The following state must only be accessed by the handler thread. */ 251 252 // The currently requested power state. 253 // The power controller will progressively update its internal state to match 254 // the requested power state. Initially null until the first update. 255 private DisplayPowerRequest mPowerRequest; 256 257 // The current power state. 258 // Must only be accessed on the handler thread. 259 private DisplayPowerState mPowerState; 260 261 // True if the device should wait for negative proximity sensor before 262 // waking up the screen. This is set to false as soon as a negative 263 // proximity sensor measurement is observed or when the device is forced to 264 // go to sleep by the user. While true, the screen remains off. 265 private boolean mWaitingForNegativeProximity; 266 267 // The actual proximity sensor threshold value. 268 private float mProximityThreshold; 269 270 // Set to true if the proximity sensor listener has been registered 271 // with the sensor manager. 272 private boolean mProximitySensorEnabled; 273 274 // The debounced proximity sensor state. 275 private int mProximity = PROXIMITY_UNKNOWN; 276 277 // The raw non-debounced proximity sensor state. 278 private int mPendingProximity = PROXIMITY_UNKNOWN; 279 private long mPendingProximityDebounceTime = -1; // -1 if fully debounced 280 281 // True if the screen was turned off because of the proximity sensor. 282 // When the screen turns on again, we report user activity to the power manager. 283 private boolean mScreenOffBecauseOfProximity; 284 285 // True if the screen on is being blocked. 286 private boolean mScreenOnWasBlocked; 287 288 // The elapsed real time when the screen on was blocked. 289 private long mScreenOnBlockStartRealTime; 290 291 // Set to true if the light sensor is enabled. 292 private boolean mLightSensorEnabled; 293 294 // The time when the light sensor was enabled. 295 private long mLightSensorEnableTime; 296 297 // The currently accepted nominal ambient light level. 298 private float mAmbientLux; 299 300 // True if mAmbientLux holds a valid value. 301 private boolean mAmbientLuxValid; 302 303 // The ambient light level threshold at which to brighten or darken the screen. 304 private float mBrighteningLuxThreshold; 305 private float mDarkeningLuxThreshold; 306 307 // The most recent light sample. 308 private float mLastObservedLux; 309 310 // The time of the most light recent sample. 311 private long mLastObservedLuxTime; 312 313 // The number of light samples collected since the light sensor was enabled. 314 private int mRecentLightSamples; 315 316 // The long-term and short-term filtered light measurements. 317 private float mRecentShortTermAverageLux; 318 private float mRecentLongTermAverageLux; 319 320 // The direction in which the average lux is moving relative to the current ambient lux. 321 // 0 if not changing or within hysteresis threshold. 322 // 1 if brightening beyond hysteresis threshold. 323 // -1 if darkening beyond hysteresis threshold. 324 private int mDebounceLuxDirection; 325 326 // The time when the average lux last changed direction. 327 private long mDebounceLuxTime; 328 329 // The screen brightness level that has been chosen by the auto-brightness 330 // algorithm. The actual brightness should ramp towards this value. 331 // We preserve this value even when we stop using the light sensor so 332 // that we can quickly revert to the previous auto-brightness level 333 // while the light sensor warms up. 334 // Use -1 if there is no current auto-brightness value available. 335 private int mScreenAutoBrightness = -1; 336 337 // The last screen auto-brightness gamma. (For printing in dump() only.) 338 private float mLastScreenAutoBrightnessGamma = 1.0f; 339 340 // True if the screen auto-brightness value is actually being used to 341 // set the display brightness. 342 private boolean mUsingScreenAutoBrightness; 343 344 // Animators. 345 private ObjectAnimator mElectronBeamOnAnimator; 346 private ObjectAnimator mElectronBeamOffAnimator; 347 private RampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator; 348 349 // Twilight changed. We might recalculate auto-brightness values. 350 private boolean mTwilightChanged; 351 352 /** 353 * Creates the display power controller. 354 */ 355 public DisplayPowerController(Context context, 356 DisplayPowerCallbacks callbacks, Handler handler, 357 SensorManager sensorManager, DisplayBlanker blanker) { 358 mHandler = new DisplayControllerHandler(handler.getLooper()); 359 mCallbacks = callbacks; 360 361 mBatteryStats = BatteryStatsService.getService(); 362 mLights = LocalServices.getService(LightsManager.class); 363 mTwilight = LocalServices.getService(TwilightManager.class); 364 mSensorManager = sensorManager; 365 mBlanker = blanker; 366 367 final Resources resources = context.getResources(); 368 369 mScreenBrightnessDozeConfig = clampAbsoluteBrightness(resources.getInteger( 370 com.android.internal.R.integer.config_screenBrightnessDoze)); 371 372 mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger( 373 com.android.internal.R.integer.config_screenBrightnessDim)); 374 375 int screenBrightnessMinimum = Math.min(resources.getInteger( 376 com.android.internal.R.integer.config_screenBrightnessSettingMinimum), 377 mScreenBrightnessDimConfig); 378 379 mUseSoftwareAutoBrightnessConfig = resources.getBoolean( 380 com.android.internal.R.bool.config_automatic_brightness_available); 381 if (mUseSoftwareAutoBrightnessConfig) { 382 int[] lux = resources.getIntArray( 383 com.android.internal.R.array.config_autoBrightnessLevels); 384 int[] screenBrightness = resources.getIntArray( 385 com.android.internal.R.array.config_autoBrightnessLcdBacklightValues); 386 387 mScreenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness); 388 if (mScreenAutoBrightnessSpline == null) { 389 Slog.e(TAG, "Error in config.xml. config_autoBrightnessLcdBacklightValues " 390 + "(size " + screenBrightness.length + ") " 391 + "must be monotic and have exactly one more entry than " 392 + "config_autoBrightnessLevels (size " + lux.length + ") " 393 + "which must be strictly increasing. " 394 + "Auto-brightness will be disabled."); 395 mUseSoftwareAutoBrightnessConfig = false; 396 } else { 397 if (screenBrightness[0] < screenBrightnessMinimum) { 398 screenBrightnessMinimum = screenBrightness[0]; 399 } 400 } 401 402 mLightSensorWarmUpTimeConfig = resources.getInteger( 403 com.android.internal.R.integer.config_lightSensorWarmupTime); 404 } 405 406 mScreenBrightnessRangeMinimum = clampAbsoluteBrightness(screenBrightnessMinimum); 407 mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON; 408 409 mElectronBeamFadesConfig = resources.getBoolean( 410 com.android.internal.R.bool.config_animateScreenLights); 411 412 if (!DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) { 413 mProximitySensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); 414 if (mProximitySensor != null) { 415 mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(), 416 TYPICAL_PROXIMITY_THRESHOLD); 417 } 418 } 419 420 if (mUseSoftwareAutoBrightnessConfig 421 && !DEBUG_PRETEND_LIGHT_SENSOR_ABSENT) { 422 mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); 423 } 424 425 if (mUseSoftwareAutoBrightnessConfig && USE_TWILIGHT_ADJUSTMENT) { 426 mTwilight.registerListener(mTwilightListener, mHandler); 427 } 428 } 429 430 private static Spline createAutoBrightnessSpline(int[] lux, int[] brightness) { 431 try { 432 final int n = brightness.length; 433 float[] x = new float[n]; 434 float[] y = new float[n]; 435 y[0] = normalizeAbsoluteBrightness(brightness[0]); 436 for (int i = 1; i < n; i++) { 437 x[i] = lux[i - 1]; 438 y[i] = normalizeAbsoluteBrightness(brightness[i]); 439 } 440 441 Spline spline = Spline.createMonotoneCubicSpline(x, y); 442 if (DEBUG) { 443 Slog.d(TAG, "Auto-brightness spline: " + spline); 444 for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) { 445 Slog.d(TAG, String.format(" %7.1f: %7.1f", v, spline.interpolate(v))); 446 } 447 } 448 return spline; 449 } catch (IllegalArgumentException ex) { 450 Slog.e(TAG, "Could not create auto-brightness spline.", ex); 451 return null; 452 } 453 } 454 455 /** 456 * Returns true if the proximity sensor screen-off function is available. 457 */ 458 public boolean isProximitySensorAvailable() { 459 return mProximitySensor != null; 460 } 461 462 /** 463 * Requests a new power state. 464 * The controller makes a copy of the provided object and then 465 * begins adjusting the power state to match what was requested. 466 * 467 * @param request The requested power state. 468 * @param waitForNegativeProximity If true, issues a request to wait for 469 * negative proximity before turning the screen back on, assuming the screen 470 * was turned off by the proximity sensor. 471 * @return True if display is ready, false if there are important changes that must 472 * be made asynchronously (such as turning the screen on), in which case the caller 473 * should grab a wake lock, watch for {@link Callbacks#onStateChanged()} then try 474 * the request again later until the state converges. 475 */ 476 public boolean requestPowerState(DisplayPowerRequest request, 477 boolean waitForNegativeProximity) { 478 if (DEBUG) { 479 Slog.d(TAG, "requestPowerState: " 480 + request + ", waitForNegativeProximity=" + waitForNegativeProximity); 481 } 482 483 synchronized (mLock) { 484 boolean changed = false; 485 486 if (waitForNegativeProximity 487 && !mPendingWaitForNegativeProximityLocked) { 488 mPendingWaitForNegativeProximityLocked = true; 489 changed = true; 490 } 491 492 if (mPendingRequestLocked == null) { 493 mPendingRequestLocked = new DisplayPowerRequest(request); 494 changed = true; 495 } else if (!mPendingRequestLocked.equals(request)) { 496 mPendingRequestLocked.copyFrom(request); 497 changed = true; 498 } 499 500 if (changed) { 501 mDisplayReadyLocked = false; 502 } 503 504 if (changed && !mPendingRequestChangedLocked) { 505 mPendingRequestChangedLocked = true; 506 sendUpdatePowerStateLocked(); 507 } 508 509 return mDisplayReadyLocked; 510 } 511 } 512 513 private void sendUpdatePowerState() { 514 synchronized (mLock) { 515 sendUpdatePowerStateLocked(); 516 } 517 } 518 519 private void sendUpdatePowerStateLocked() { 520 if (!mPendingUpdatePowerStateLocked) { 521 mPendingUpdatePowerStateLocked = true; 522 Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE); 523 msg.setAsynchronous(true); 524 mHandler.sendMessage(msg); 525 } 526 } 527 528 private void initialize() { 529 // Initialize the power state object for the default display. 530 // In the future, we might manage multiple displays independently. 531 mPowerState = new DisplayPowerState(mBlanker, 532 mLights.getLight(LightsManager.LIGHT_ID_BACKLIGHT), 533 new ElectronBeam(Display.DEFAULT_DISPLAY)); 534 535 mElectronBeamOnAnimator = ObjectAnimator.ofFloat( 536 mPowerState, DisplayPowerState.ELECTRON_BEAM_LEVEL, 0.0f, 1.0f); 537 mElectronBeamOnAnimator.setDuration(ELECTRON_BEAM_ON_ANIMATION_DURATION_MILLIS); 538 mElectronBeamOnAnimator.addListener(mAnimatorListener); 539 540 mElectronBeamOffAnimator = ObjectAnimator.ofFloat( 541 mPowerState, DisplayPowerState.ELECTRON_BEAM_LEVEL, 1.0f, 0.0f); 542 mElectronBeamOffAnimator.setDuration(ELECTRON_BEAM_OFF_ANIMATION_DURATION_MILLIS); 543 mElectronBeamOffAnimator.addListener(mAnimatorListener); 544 545 mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>( 546 mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS); 547 548 // Initialize screen state for battery stats. 549 try { 550 mBatteryStats.noteScreenState(mPowerState.getScreenState()); 551 mBatteryStats.noteScreenBrightness(mPowerState.getScreenBrightness()); 552 } catch (RemoteException ex) { 553 // same process 554 } 555 } 556 557 private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() { 558 @Override 559 public void onAnimationStart(Animator animation) { 560 } 561 @Override 562 public void onAnimationEnd(Animator animation) { 563 sendUpdatePowerState(); 564 } 565 @Override 566 public void onAnimationRepeat(Animator animation) { 567 } 568 @Override 569 public void onAnimationCancel(Animator animation) { 570 } 571 }; 572 573 private void updatePowerState() { 574 // Update the power state request. 575 final boolean mustNotify; 576 boolean mustInitialize = false; 577 boolean updateAutoBrightness = mTwilightChanged; 578 boolean wasDimOrDoze = false; 579 mTwilightChanged = false; 580 581 synchronized (mLock) { 582 mPendingUpdatePowerStateLocked = false; 583 if (mPendingRequestLocked == null) { 584 return; // wait until first actual power request 585 } 586 587 if (mPowerRequest == null) { 588 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked); 589 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked; 590 mPendingWaitForNegativeProximityLocked = false; 591 mPendingRequestChangedLocked = false; 592 mustInitialize = true; 593 } else if (mPendingRequestChangedLocked) { 594 if (mPowerRequest.screenAutoBrightnessAdjustment 595 != mPendingRequestLocked.screenAutoBrightnessAdjustment) { 596 updateAutoBrightness = true; 597 } 598 wasDimOrDoze = (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM 599 || mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE); 600 mPowerRequest.copyFrom(mPendingRequestLocked); 601 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked; 602 mPendingWaitForNegativeProximityLocked = false; 603 mPendingRequestChangedLocked = false; 604 mDisplayReadyLocked = false; 605 } 606 607 mustNotify = !mDisplayReadyLocked; 608 } 609 610 // Initialize things the first time the power state is changed. 611 if (mustInitialize) { 612 initialize(); 613 } 614 615 // Apply the proximity sensor. 616 if (mProximitySensor != null) { 617 if (mPowerRequest.useProximitySensor 618 && mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) { 619 setProximitySensorEnabled(true); 620 if (!mScreenOffBecauseOfProximity 621 && mProximity == PROXIMITY_POSITIVE) { 622 mScreenOffBecauseOfProximity = true; 623 sendOnProximityPositiveWithWakelock(); 624 } 625 } else if (mWaitingForNegativeProximity 626 && mScreenOffBecauseOfProximity 627 && mProximity == PROXIMITY_POSITIVE 628 && mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) { 629 setProximitySensorEnabled(true); 630 } else { 631 setProximitySensorEnabled(false); 632 mWaitingForNegativeProximity = false; 633 } 634 if (mScreenOffBecauseOfProximity 635 && mProximity != PROXIMITY_POSITIVE) { 636 mScreenOffBecauseOfProximity = false; 637 sendOnProximityNegativeWithWakelock(); 638 } 639 } else { 640 mWaitingForNegativeProximity = false; 641 } 642 643 // Turn on the light sensor if needed. 644 if (mLightSensor != null) { 645 setLightSensorEnabled(mPowerRequest.wantLightSensorEnabled(), 646 updateAutoBrightness); 647 } 648 649 // Set the screen brightness. 650 if (mPowerRequest.wantScreenOnAny()) { 651 int target; 652 boolean slow; 653 if (mScreenAutoBrightness >= 0 && mLightSensorEnabled) { 654 // Use current auto-brightness value. 655 target = mScreenAutoBrightness; 656 slow = mUsingScreenAutoBrightness; 657 mUsingScreenAutoBrightness = true; 658 } else { 659 // Light sensor is disabled or not ready yet. 660 // Use the current brightness setting from the request, which is expected 661 // provide a nominal default value for the case where auto-brightness 662 // is not ready yet. 663 target = mPowerRequest.screenBrightness; 664 slow = false; 665 mUsingScreenAutoBrightness = false; 666 } 667 if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE) { 668 // Dim quickly to the doze state. 669 target = mScreenBrightnessDozeConfig; 670 slow = false; 671 } else if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM) { 672 // Dim quickly by at least some minimum amount. 673 target = Math.min(target - SCREEN_DIM_MINIMUM_REDUCTION, 674 mScreenBrightnessDimConfig); 675 slow = false; 676 } else if (wasDimOrDoze) { 677 // Brighten quickly. 678 slow = false; 679 } 680 animateScreenBrightness(clampScreenBrightness(target), 681 slow ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST); 682 } else { 683 // Screen is off. Don't bother changing the brightness. 684 mUsingScreenAutoBrightness = false; 685 } 686 687 // Animate the screen on or off unless blocked. 688 if (mScreenOffBecauseOfProximity) { 689 // Screen off due to proximity. 690 setScreenState(Display.STATE_OFF); 691 unblockScreenOn(); 692 } else if (mPowerRequest.wantScreenOnAny()) { 693 // Want screen on. 694 // Wait for previous off animation to complete beforehand. 695 // It is relatively short but if we cancel it and switch to the 696 // on animation immediately then the results are pretty ugly. 697 if (!mElectronBeamOffAnimator.isStarted()) { 698 // Turn the screen on. The contents of the screen may not yet 699 // be visible if the electron beam has not been dismissed because 700 // its last frame of animation is solid black. 701 setScreenState(mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE 702 ? Display.STATE_DOZING : Display.STATE_ON); 703 704 if (mPowerRequest.blockScreenOn 705 && mPowerState.getElectronBeamLevel() == 0.0f) { 706 blockScreenOn(); 707 } else { 708 unblockScreenOn(); 709 if (USE_ELECTRON_BEAM_ON_ANIMATION) { 710 if (!mElectronBeamOnAnimator.isStarted()) { 711 if (mPowerState.getElectronBeamLevel() == 1.0f) { 712 mPowerState.dismissElectronBeam(); 713 } else if (mPowerState.prepareElectronBeam( 714 mElectronBeamFadesConfig ? 715 ElectronBeam.MODE_FADE : 716 ElectronBeam.MODE_WARM_UP)) { 717 mElectronBeamOnAnimator.start(); 718 } else { 719 mElectronBeamOnAnimator.end(); 720 } 721 } 722 } else { 723 mPowerState.setElectronBeamLevel(1.0f); 724 mPowerState.dismissElectronBeam(); 725 } 726 } 727 } 728 } else { 729 // Want screen off. 730 // Wait for previous on animation to complete beforehand. 731 unblockScreenOn(); 732 if (!mElectronBeamOnAnimator.isStarted()) { 733 if (!mElectronBeamOffAnimator.isStarted()) { 734 if (mPowerState.getElectronBeamLevel() == 0.0f) { 735 setScreenState(Display.STATE_OFF); 736 } else if (mPowerState.prepareElectronBeam( 737 mElectronBeamFadesConfig ? 738 ElectronBeam.MODE_FADE : 739 ElectronBeam.MODE_COOL_DOWN) 740 && mPowerState.getScreenState() != Display.STATE_OFF) { 741 mElectronBeamOffAnimator.start(); 742 } else { 743 mElectronBeamOffAnimator.end(); 744 } 745 } 746 } 747 } 748 749 // Report whether the display is ready for use. 750 // We mostly care about the screen state here, ignoring brightness changes 751 // which will be handled asynchronously. 752 if (mustNotify 753 && !mScreenOnWasBlocked 754 && !mElectronBeamOnAnimator.isStarted() 755 && !mElectronBeamOffAnimator.isStarted() 756 && mPowerState.waitUntilClean(mCleanListener)) { 757 synchronized (mLock) { 758 if (!mPendingRequestChangedLocked) { 759 mDisplayReadyLocked = true; 760 761 if (DEBUG) { 762 Slog.d(TAG, "Display ready!"); 763 } 764 } 765 } 766 sendOnStateChangedWithWakelock(); 767 } 768 } 769 770 private void blockScreenOn() { 771 if (!mScreenOnWasBlocked) { 772 mScreenOnWasBlocked = true; 773 mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime(); 774 if (DEBUG) { 775 Slog.d(TAG, "Blocked screen on."); 776 } 777 } 778 } 779 780 private void unblockScreenOn() { 781 if (mScreenOnWasBlocked) { 782 mScreenOnWasBlocked = false; 783 long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime; 784 if (delay > 1000 || DEBUG) { 785 Slog.d(TAG, "Unblocked screen on after " + delay + " ms"); 786 } 787 } 788 } 789 790 private void setScreenState(int state) { 791 if (mPowerState.getScreenState() != state) { 792 mPowerState.setScreenState(state); 793 try { 794 mBatteryStats.noteScreenState(state); 795 } catch (RemoteException ex) { 796 // same process 797 } 798 } 799 } 800 801 private int clampScreenBrightness(int value) { 802 return clamp(value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 803 } 804 805 private static int clampAbsoluteBrightness(int value) { 806 return clamp(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON); 807 } 808 809 private static int clamp(int value, int min, int max) { 810 if (value <= min) { 811 return min; 812 } 813 if (value >= max) { 814 return max; 815 } 816 return value; 817 } 818 819 private static float normalizeAbsoluteBrightness(int value) { 820 return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON; 821 } 822 823 private void animateScreenBrightness(int target, int rate) { 824 if (mScreenBrightnessRampAnimator.animateTo(target, rate)) { 825 try { 826 mBatteryStats.noteScreenBrightness(target); 827 } catch (RemoteException ex) { 828 // same process 829 } 830 } 831 } 832 833 private final Runnable mCleanListener = new Runnable() { 834 @Override 835 public void run() { 836 sendUpdatePowerState(); 837 } 838 }; 839 840 private void setProximitySensorEnabled(boolean enable) { 841 if (enable) { 842 if (!mProximitySensorEnabled) { 843 // Register the listener. 844 // Proximity sensor state already cleared initially. 845 mProximitySensorEnabled = true; 846 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor, 847 SensorManager.SENSOR_DELAY_NORMAL, mHandler); 848 } 849 } else { 850 if (mProximitySensorEnabled) { 851 // Unregister the listener. 852 // Clear the proximity sensor state for next time. 853 mProximitySensorEnabled = false; 854 mProximity = PROXIMITY_UNKNOWN; 855 mPendingProximity = PROXIMITY_UNKNOWN; 856 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 857 mSensorManager.unregisterListener(mProximitySensorListener); 858 clearPendingProximityDebounceTime(); // release wake lock (must be last) 859 } 860 } 861 } 862 863 private void handleProximitySensorEvent(long time, boolean positive) { 864 if (mProximitySensorEnabled) { 865 if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) { 866 return; // no change 867 } 868 if (mPendingProximity == PROXIMITY_POSITIVE && positive) { 869 return; // no change 870 } 871 872 // Only accept a proximity sensor reading if it remains 873 // stable for the entire debounce delay. We hold a wake lock while 874 // debouncing the sensor. 875 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 876 if (positive) { 877 mPendingProximity = PROXIMITY_POSITIVE; 878 setPendingProximityDebounceTime( 879 time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock 880 } else { 881 mPendingProximity = PROXIMITY_NEGATIVE; 882 setPendingProximityDebounceTime( 883 time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock 884 } 885 886 // Debounce the new sensor reading. 887 debounceProximitySensor(); 888 } 889 } 890 891 private void debounceProximitySensor() { 892 if (mProximitySensorEnabled 893 && mPendingProximity != PROXIMITY_UNKNOWN 894 && mPendingProximityDebounceTime >= 0) { 895 final long now = SystemClock.uptimeMillis(); 896 if (mPendingProximityDebounceTime <= now) { 897 // Sensor reading accepted. Apply the change then release the wake lock. 898 mProximity = mPendingProximity; 899 updatePowerState(); 900 clearPendingProximityDebounceTime(); // release wake lock (must be last) 901 } else { 902 // Need to wait a little longer. 903 // Debounce again later. We continue holding a wake lock while waiting. 904 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED); 905 msg.setAsynchronous(true); 906 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime); 907 } 908 } 909 } 910 911 private void clearPendingProximityDebounceTime() { 912 if (mPendingProximityDebounceTime >= 0) { 913 mPendingProximityDebounceTime = -1; 914 mCallbacks.releaseSuspendBlocker(); // release wake lock 915 } 916 } 917 918 private void setPendingProximityDebounceTime(long debounceTime) { 919 if (mPendingProximityDebounceTime < 0) { 920 mCallbacks.acquireSuspendBlocker(); // acquire wake lock 921 } 922 mPendingProximityDebounceTime = debounceTime; 923 } 924 925 private void setLightSensorEnabled(boolean enable, boolean updateAutoBrightness) { 926 if (enable) { 927 if (!mLightSensorEnabled) { 928 updateAutoBrightness = true; 929 mLightSensorEnabled = true; 930 mLightSensorEnableTime = SystemClock.uptimeMillis(); 931 mSensorManager.registerListener(mLightSensorListener, mLightSensor, 932 LIGHT_SENSOR_RATE_MILLIS * 1000, mHandler); 933 } 934 } else { 935 if (mLightSensorEnabled) { 936 mLightSensorEnabled = false; 937 mAmbientLuxValid = false; 938 mRecentLightSamples = 0; 939 mHandler.removeMessages(MSG_LIGHT_SENSOR_DEBOUNCED); 940 mSensorManager.unregisterListener(mLightSensorListener); 941 } 942 } 943 if (updateAutoBrightness) { 944 updateAutoBrightness(false); 945 } 946 } 947 948 private void handleLightSensorEvent(long time, float lux) { 949 mHandler.removeMessages(MSG_LIGHT_SENSOR_DEBOUNCED); 950 951 applyLightSensorMeasurement(time, lux); 952 updateAmbientLux(time); 953 } 954 955 private void applyLightSensorMeasurement(long time, float lux) { 956 // Update our filters. 957 mRecentLightSamples += 1; 958 if (mRecentLightSamples == 1) { 959 mRecentShortTermAverageLux = lux; 960 mRecentLongTermAverageLux = lux; 961 } else { 962 final long timeDelta = time - mLastObservedLuxTime; 963 mRecentShortTermAverageLux += (lux - mRecentShortTermAverageLux) 964 * timeDelta / (SHORT_TERM_AVERAGE_LIGHT_TIME_CONSTANT + timeDelta); 965 mRecentLongTermAverageLux += (lux - mRecentLongTermAverageLux) 966 * timeDelta / (LONG_TERM_AVERAGE_LIGHT_TIME_CONSTANT + timeDelta); 967 } 968 969 // Remember this sample value. 970 mLastObservedLux = lux; 971 mLastObservedLuxTime = time; 972 } 973 974 private void setAmbientLux(float lux) { 975 mAmbientLux = lux; 976 mBrighteningLuxThreshold = mAmbientLux * (1.0f + BRIGHTENING_LIGHT_HYSTERESIS); 977 mDarkeningLuxThreshold = mAmbientLux * (1.0f - DARKENING_LIGHT_HYSTERESIS); 978 } 979 980 private void updateAmbientLux(long time) { 981 // If the light sensor was just turned on then immediately update our initial 982 // estimate of the current ambient light level. 983 if (!mAmbientLuxValid) { 984 final long timeWhenSensorWarmedUp = 985 mLightSensorWarmUpTimeConfig + mLightSensorEnableTime; 986 if (time < timeWhenSensorWarmedUp) { 987 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, 988 timeWhenSensorWarmedUp); 989 return; 990 } 991 setAmbientLux(mRecentShortTermAverageLux); 992 mAmbientLuxValid = true; 993 mDebounceLuxDirection = 0; 994 mDebounceLuxTime = time; 995 if (DEBUG) { 996 Slog.d(TAG, "updateAmbientLux: Initializing: " 997 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 998 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 999 + ", mAmbientLux=" + mAmbientLux); 1000 } 1001 updateAutoBrightness(true); 1002 } else if (mRecentShortTermAverageLux > mBrighteningLuxThreshold 1003 && mRecentLongTermAverageLux > mBrighteningLuxThreshold) { 1004 // The ambient environment appears to be brightening. 1005 if (mDebounceLuxDirection <= 0) { 1006 mDebounceLuxDirection = 1; 1007 mDebounceLuxTime = time; 1008 if (DEBUG) { 1009 Slog.d(TAG, "updateAmbientLux: Possibly brightened, waiting for " 1010 + BRIGHTENING_LIGHT_DEBOUNCE + " ms: " 1011 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1012 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1013 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1014 + ", mAmbientLux=" + mAmbientLux); 1015 } 1016 } 1017 long debounceTime = mDebounceLuxTime + BRIGHTENING_LIGHT_DEBOUNCE; 1018 if (time < debounceTime) { 1019 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, debounceTime); 1020 return; 1021 } 1022 setAmbientLux(mRecentShortTermAverageLux); 1023 if (DEBUG) { 1024 Slog.d(TAG, "updateAmbientLux: Brightened: " 1025 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1026 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1027 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1028 + ", mAmbientLux=" + mAmbientLux); 1029 } 1030 updateAutoBrightness(true); 1031 } else if (mRecentShortTermAverageLux < mDarkeningLuxThreshold 1032 && mRecentLongTermAverageLux < mDarkeningLuxThreshold) { 1033 // The ambient environment appears to be darkening. 1034 if (mDebounceLuxDirection >= 0) { 1035 mDebounceLuxDirection = -1; 1036 mDebounceLuxTime = time; 1037 if (DEBUG) { 1038 Slog.d(TAG, "updateAmbientLux: Possibly darkened, waiting for " 1039 + DARKENING_LIGHT_DEBOUNCE + " ms: " 1040 + "mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1041 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1042 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1043 + ", mAmbientLux=" + mAmbientLux); 1044 } 1045 } 1046 long debounceTime = mDebounceLuxTime + DARKENING_LIGHT_DEBOUNCE; 1047 if (time < debounceTime) { 1048 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, debounceTime); 1049 return; 1050 } 1051 // Be conservative about reducing the brightness, only reduce it a little bit 1052 // at a time to avoid having to bump it up again soon. 1053 setAmbientLux(Math.max(mRecentShortTermAverageLux, mRecentLongTermAverageLux)); 1054 if (DEBUG) { 1055 Slog.d(TAG, "updateAmbientLux: Darkened: " 1056 + "mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1057 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1058 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1059 + ", mAmbientLux=" + mAmbientLux); 1060 } 1061 updateAutoBrightness(true); 1062 } else if (mDebounceLuxDirection != 0) { 1063 // No change or change is within the hysteresis thresholds. 1064 mDebounceLuxDirection = 0; 1065 mDebounceLuxTime = time; 1066 if (DEBUG) { 1067 Slog.d(TAG, "updateAmbientLux: Canceled debounce: " 1068 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1069 + ", mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1070 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1071 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1072 + ", mAmbientLux=" + mAmbientLux); 1073 } 1074 } 1075 1076 // Now that we've done all of that, we haven't yet posted a debounce 1077 // message. So consider the case where current lux is beyond the 1078 // threshold. It's possible that the light sensor may not report values 1079 // if the light level does not change, so we need to occasionally 1080 // synthesize sensor readings in order to make sure the brightness is 1081 // adjusted accordingly. Note these thresholds may have changed since 1082 // we entered the function because we called setAmbientLux and 1083 // updateAutoBrightness along the way. 1084 if (mLastObservedLux > mBrighteningLuxThreshold 1085 || mLastObservedLux < mDarkeningLuxThreshold) { 1086 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, 1087 time + SYNTHETIC_LIGHT_SENSOR_RATE_MILLIS); 1088 } 1089 } 1090 1091 private void debounceLightSensor() { 1092 if (mLightSensorEnabled) { 1093 long time = SystemClock.uptimeMillis(); 1094 if (time >= mLastObservedLuxTime + SYNTHETIC_LIGHT_SENSOR_RATE_MILLIS) { 1095 if (DEBUG) { 1096 Slog.d(TAG, "debounceLightSensor: Synthesizing light sensor measurement " 1097 + "after " + (time - mLastObservedLuxTime) + " ms."); 1098 } 1099 applyLightSensorMeasurement(time, mLastObservedLux); 1100 } 1101 updateAmbientLux(time); 1102 } 1103 } 1104 1105 private void updateAutoBrightness(boolean sendUpdate) { 1106 if (!mAmbientLuxValid) { 1107 return; 1108 } 1109 1110 float value = mScreenAutoBrightnessSpline.interpolate(mAmbientLux); 1111 float gamma = 1.0f; 1112 1113 if (USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT 1114 && mPowerRequest.screenAutoBrightnessAdjustment != 0.0f) { 1115 final float adjGamma = FloatMath.pow(SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA, 1116 Math.min(1.0f, Math.max(-1.0f, 1117 -mPowerRequest.screenAutoBrightnessAdjustment))); 1118 gamma *= adjGamma; 1119 if (DEBUG) { 1120 Slog.d(TAG, "updateAutoBrightness: adjGamma=" + adjGamma); 1121 } 1122 } 1123 1124 if (USE_TWILIGHT_ADJUSTMENT) { 1125 TwilightState state = mTwilight.getCurrentState(); 1126 if (state != null && state.isNight()) { 1127 final long now = System.currentTimeMillis(); 1128 final float earlyGamma = 1129 getTwilightGamma(now, state.getYesterdaySunset(), state.getTodaySunrise()); 1130 final float lateGamma = 1131 getTwilightGamma(now, state.getTodaySunset(), state.getTomorrowSunrise()); 1132 gamma *= earlyGamma * lateGamma; 1133 if (DEBUG) { 1134 Slog.d(TAG, "updateAutoBrightness: earlyGamma=" + earlyGamma 1135 + ", lateGamma=" + lateGamma); 1136 } 1137 } 1138 } 1139 1140 if (gamma != 1.0f) { 1141 final float in = value; 1142 value = FloatMath.pow(value, gamma); 1143 if (DEBUG) { 1144 Slog.d(TAG, "updateAutoBrightness: gamma=" + gamma 1145 + ", in=" + in + ", out=" + value); 1146 } 1147 } 1148 1149 int newScreenAutoBrightness = clampScreenBrightness( 1150 Math.round(value * PowerManager.BRIGHTNESS_ON)); 1151 if (mScreenAutoBrightness != newScreenAutoBrightness) { 1152 if (DEBUG) { 1153 Slog.d(TAG, "updateAutoBrightness: mScreenAutoBrightness=" 1154 + mScreenAutoBrightness + ", newScreenAutoBrightness=" 1155 + newScreenAutoBrightness); 1156 } 1157 1158 mScreenAutoBrightness = newScreenAutoBrightness; 1159 mLastScreenAutoBrightnessGamma = gamma; 1160 if (sendUpdate) { 1161 sendUpdatePowerState(); 1162 } 1163 } 1164 } 1165 1166 private static float getTwilightGamma(long now, long lastSunset, long nextSunrise) { 1167 if (lastSunset < 0 || nextSunrise < 0 1168 || now < lastSunset || now > nextSunrise) { 1169 return 1.0f; 1170 } 1171 1172 if (now < lastSunset + TWILIGHT_ADJUSTMENT_TIME) { 1173 return lerp(1.0f, TWILIGHT_ADJUSTMENT_MAX_GAMMA, 1174 (float)(now - lastSunset) / TWILIGHT_ADJUSTMENT_TIME); 1175 } 1176 1177 if (now > nextSunrise - TWILIGHT_ADJUSTMENT_TIME) { 1178 return lerp(1.0f, TWILIGHT_ADJUSTMENT_MAX_GAMMA, 1179 (float)(nextSunrise - now) / TWILIGHT_ADJUSTMENT_TIME); 1180 } 1181 1182 return TWILIGHT_ADJUSTMENT_MAX_GAMMA; 1183 } 1184 1185 private static float lerp(float x, float y, float alpha) { 1186 return x + (y - x) * alpha; 1187 } 1188 1189 private void sendOnStateChangedWithWakelock() { 1190 mCallbacks.acquireSuspendBlocker(); 1191 mHandler.post(mOnStateChangedRunnable); 1192 } 1193 1194 private final Runnable mOnStateChangedRunnable = new Runnable() { 1195 @Override 1196 public void run() { 1197 mCallbacks.onStateChanged(); 1198 mCallbacks.releaseSuspendBlocker(); 1199 } 1200 }; 1201 1202 private void sendOnProximityPositiveWithWakelock() { 1203 mCallbacks.acquireSuspendBlocker(); 1204 mHandler.post(mOnProximityPositiveRunnable); 1205 } 1206 1207 private final Runnable mOnProximityPositiveRunnable = new Runnable() { 1208 @Override 1209 public void run() { 1210 mCallbacks.onProximityPositive(); 1211 mCallbacks.releaseSuspendBlocker(); 1212 } 1213 }; 1214 1215 private void sendOnProximityNegativeWithWakelock() { 1216 mCallbacks.acquireSuspendBlocker(); 1217 mHandler.post(mOnProximityNegativeRunnable); 1218 } 1219 1220 private final Runnable mOnProximityNegativeRunnable = new Runnable() { 1221 @Override 1222 public void run() { 1223 mCallbacks.onProximityNegative(); 1224 mCallbacks.releaseSuspendBlocker(); 1225 } 1226 }; 1227 1228 public void dump(final PrintWriter pw) { 1229 synchronized (mLock) { 1230 pw.println(); 1231 pw.println("Display Power Controller Locked State:"); 1232 pw.println(" mDisplayReadyLocked=" + mDisplayReadyLocked); 1233 pw.println(" mPendingRequestLocked=" + mPendingRequestLocked); 1234 pw.println(" mPendingRequestChangedLocked=" + mPendingRequestChangedLocked); 1235 pw.println(" mPendingWaitForNegativeProximityLocked=" 1236 + mPendingWaitForNegativeProximityLocked); 1237 pw.println(" mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked); 1238 } 1239 1240 pw.println(); 1241 pw.println("Display Power Controller Configuration:"); 1242 pw.println(" mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig); 1243 pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig); 1244 pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 1245 pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 1246 pw.println(" mUseSoftwareAutoBrightnessConfig=" 1247 + mUseSoftwareAutoBrightnessConfig); 1248 pw.println(" mScreenAutoBrightnessSpline=" + mScreenAutoBrightnessSpline); 1249 pw.println(" mLightSensorWarmUpTimeConfig=" + mLightSensorWarmUpTimeConfig); 1250 1251 mHandler.runWithScissors(new Runnable() { 1252 @Override 1253 public void run() { 1254 dumpLocal(pw); 1255 } 1256 }, 1000); 1257 } 1258 1259 private void dumpLocal(PrintWriter pw) { 1260 pw.println(); 1261 pw.println("Display Power Controller Thread State:"); 1262 pw.println(" mPowerRequest=" + mPowerRequest); 1263 pw.println(" mWaitingForNegativeProximity=" + mWaitingForNegativeProximity); 1264 1265 pw.println(" mProximitySensor=" + mProximitySensor); 1266 pw.println(" mProximitySensorEnabled=" + mProximitySensorEnabled); 1267 pw.println(" mProximityThreshold=" + mProximityThreshold); 1268 pw.println(" mProximity=" + proximityToString(mProximity)); 1269 pw.println(" mPendingProximity=" + proximityToString(mPendingProximity)); 1270 pw.println(" mPendingProximityDebounceTime=" 1271 + TimeUtils.formatUptime(mPendingProximityDebounceTime)); 1272 pw.println(" mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity); 1273 1274 pw.println(" mLightSensor=" + mLightSensor); 1275 pw.println(" mLightSensorEnabled=" + mLightSensorEnabled); 1276 pw.println(" mLightSensorEnableTime=" 1277 + TimeUtils.formatUptime(mLightSensorEnableTime)); 1278 pw.println(" mAmbientLux=" + mAmbientLux); 1279 pw.println(" mAmbientLuxValid=" + mAmbientLuxValid); 1280 pw.println(" mLastObservedLux=" + mLastObservedLux); 1281 pw.println(" mLastObservedLuxTime=" 1282 + TimeUtils.formatUptime(mLastObservedLuxTime)); 1283 pw.println(" mRecentLightSamples=" + mRecentLightSamples); 1284 pw.println(" mRecentShortTermAverageLux=" + mRecentShortTermAverageLux); 1285 pw.println(" mRecentLongTermAverageLux=" + mRecentLongTermAverageLux); 1286 pw.println(" mDebounceLuxDirection=" + mDebounceLuxDirection); 1287 pw.println(" mDebounceLuxTime=" + TimeUtils.formatUptime(mDebounceLuxTime)); 1288 pw.println(" mScreenAutoBrightness=" + mScreenAutoBrightness); 1289 pw.println(" mUsingScreenAutoBrightness=" + mUsingScreenAutoBrightness); 1290 pw.println(" mLastScreenAutoBrightnessGamma=" + mLastScreenAutoBrightnessGamma); 1291 pw.println(" mTwilight.getCurrentState()=" + mTwilight.getCurrentState()); 1292 1293 if (mElectronBeamOnAnimator != null) { 1294 pw.println(" mElectronBeamOnAnimator.isStarted()=" + 1295 mElectronBeamOnAnimator.isStarted()); 1296 } 1297 if (mElectronBeamOffAnimator != null) { 1298 pw.println(" mElectronBeamOffAnimator.isStarted()=" + 1299 mElectronBeamOffAnimator.isStarted()); 1300 } 1301 1302 if (mPowerState != null) { 1303 mPowerState.dump(pw); 1304 } 1305 } 1306 1307 private static String proximityToString(int state) { 1308 switch (state) { 1309 case PROXIMITY_UNKNOWN: 1310 return "Unknown"; 1311 case PROXIMITY_NEGATIVE: 1312 return "Negative"; 1313 case PROXIMITY_POSITIVE: 1314 return "Positive"; 1315 default: 1316 return Integer.toString(state); 1317 } 1318 } 1319 1320 private final class DisplayControllerHandler extends Handler { 1321 public DisplayControllerHandler(Looper looper) { 1322 super(looper, null, true /*async*/); 1323 } 1324 1325 @Override 1326 public void handleMessage(Message msg) { 1327 switch (msg.what) { 1328 case MSG_UPDATE_POWER_STATE: 1329 updatePowerState(); 1330 break; 1331 1332 case MSG_PROXIMITY_SENSOR_DEBOUNCED: 1333 debounceProximitySensor(); 1334 break; 1335 1336 case MSG_LIGHT_SENSOR_DEBOUNCED: 1337 debounceLightSensor(); 1338 break; 1339 } 1340 } 1341 } 1342 1343 private final SensorEventListener mProximitySensorListener = new SensorEventListener() { 1344 @Override 1345 public void onSensorChanged(SensorEvent event) { 1346 if (mProximitySensorEnabled) { 1347 final long time = SystemClock.uptimeMillis(); 1348 final float distance = event.values[0]; 1349 boolean positive = distance >= 0.0f && distance < mProximityThreshold; 1350 handleProximitySensorEvent(time, positive); 1351 } 1352 } 1353 1354 @Override 1355 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1356 // Not used. 1357 } 1358 }; 1359 1360 private final SensorEventListener mLightSensorListener = new SensorEventListener() { 1361 @Override 1362 public void onSensorChanged(SensorEvent event) { 1363 if (mLightSensorEnabled) { 1364 final long time = SystemClock.uptimeMillis(); 1365 final float lux = event.values[0]; 1366 handleLightSensorEvent(time, lux); 1367 } 1368 } 1369 1370 @Override 1371 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1372 // Not used. 1373 } 1374 }; 1375 1376 private final TwilightListener mTwilightListener = new TwilightListener() { 1377 @Override 1378 public void onTwilightStateChanged() { 1379 mTwilightChanged = true; 1380 updatePowerState(); 1381 } 1382 }; 1383} 1384