DisplayPowerController.java revision 037c33eae74bee2774897d969d48947f9abe254f
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 } 548 549 private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() { 550 @Override 551 public void onAnimationStart(Animator animation) { 552 } 553 @Override 554 public void onAnimationEnd(Animator animation) { 555 sendUpdatePowerState(); 556 } 557 @Override 558 public void onAnimationRepeat(Animator animation) { 559 } 560 @Override 561 public void onAnimationCancel(Animator animation) { 562 } 563 }; 564 565 private void updatePowerState() { 566 // Update the power state request. 567 final boolean mustNotify; 568 boolean mustInitialize = false; 569 boolean updateAutoBrightness = mTwilightChanged; 570 boolean wasDimOrDoze = false; 571 mTwilightChanged = false; 572 573 synchronized (mLock) { 574 mPendingUpdatePowerStateLocked = false; 575 if (mPendingRequestLocked == null) { 576 return; // wait until first actual power request 577 } 578 579 if (mPowerRequest == null) { 580 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked); 581 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked; 582 mPendingWaitForNegativeProximityLocked = false; 583 mPendingRequestChangedLocked = false; 584 mustInitialize = true; 585 } else if (mPendingRequestChangedLocked) { 586 if (mPowerRequest.screenAutoBrightnessAdjustment 587 != mPendingRequestLocked.screenAutoBrightnessAdjustment) { 588 updateAutoBrightness = true; 589 } 590 wasDimOrDoze = (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM 591 || mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE); 592 mPowerRequest.copyFrom(mPendingRequestLocked); 593 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked; 594 mPendingWaitForNegativeProximityLocked = false; 595 mPendingRequestChangedLocked = false; 596 mDisplayReadyLocked = false; 597 } 598 599 mustNotify = !mDisplayReadyLocked; 600 } 601 602 // Initialize things the first time the power state is changed. 603 if (mustInitialize) { 604 initialize(); 605 } 606 607 // Apply the proximity sensor. 608 if (mProximitySensor != null) { 609 if (mPowerRequest.useProximitySensor 610 && mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) { 611 setProximitySensorEnabled(true); 612 if (!mScreenOffBecauseOfProximity 613 && mProximity == PROXIMITY_POSITIVE) { 614 mScreenOffBecauseOfProximity = true; 615 sendOnProximityPositiveWithWakelock(); 616 } 617 } else if (mWaitingForNegativeProximity 618 && mScreenOffBecauseOfProximity 619 && mProximity == PROXIMITY_POSITIVE 620 && mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) { 621 setProximitySensorEnabled(true); 622 } else { 623 setProximitySensorEnabled(false); 624 mWaitingForNegativeProximity = false; 625 } 626 if (mScreenOffBecauseOfProximity 627 && mProximity != PROXIMITY_POSITIVE) { 628 mScreenOffBecauseOfProximity = false; 629 sendOnProximityNegativeWithWakelock(); 630 } 631 } else { 632 mWaitingForNegativeProximity = false; 633 } 634 635 // Turn on the light sensor if needed. 636 if (mLightSensor != null) { 637 setLightSensorEnabled(mPowerRequest.wantLightSensorEnabled(), 638 updateAutoBrightness); 639 } 640 641 // Set the screen brightness. 642 if (mPowerRequest.wantScreenOnAny()) { 643 int target; 644 boolean slow; 645 if (mScreenAutoBrightness >= 0 && mLightSensorEnabled) { 646 // Use current auto-brightness value. 647 target = mScreenAutoBrightness; 648 slow = mUsingScreenAutoBrightness; 649 mUsingScreenAutoBrightness = true; 650 } else { 651 // Light sensor is disabled or not ready yet. 652 // Use the current brightness setting from the request, which is expected 653 // provide a nominal default value for the case where auto-brightness 654 // is not ready yet. 655 target = mPowerRequest.screenBrightness; 656 slow = false; 657 mUsingScreenAutoBrightness = false; 658 } 659 if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE) { 660 // Dim quickly to the doze state. 661 target = mScreenBrightnessDozeConfig; 662 slow = false; 663 } else if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM) { 664 // Dim quickly by at least some minimum amount. 665 target = Math.min(target - SCREEN_DIM_MINIMUM_REDUCTION, 666 mScreenBrightnessDimConfig); 667 slow = false; 668 } else if (wasDimOrDoze) { 669 // Brighten quickly. 670 slow = false; 671 } 672 animateScreenBrightness(clampScreenBrightness(target), 673 slow ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST); 674 } else { 675 // Screen is off. Don't bother changing the brightness. 676 mUsingScreenAutoBrightness = false; 677 } 678 679 // Animate the screen on or off unless blocked. 680 if (mScreenOffBecauseOfProximity) { 681 // Screen off due to proximity. 682 setScreenState(Display.STATE_OFF); 683 unblockScreenOn(); 684 } else if (mPowerRequest.wantScreenOnAny()) { 685 // Want screen on. 686 // Wait for previous off animation to complete beforehand. 687 // It is relatively short but if we cancel it and switch to the 688 // on animation immediately then the results are pretty ugly. 689 if (!mElectronBeamOffAnimator.isStarted()) { 690 // Turn the screen on. The contents of the screen may not yet 691 // be visible if the electron beam has not been dismissed because 692 // its last frame of animation is solid black. 693 setScreenState(mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DOZE 694 ? Display.STATE_DOZING : Display.STATE_ON); 695 696 if (mPowerRequest.blockScreenOn 697 && mPowerState.getElectronBeamLevel() == 0.0f) { 698 blockScreenOn(); 699 } else { 700 unblockScreenOn(); 701 if (USE_ELECTRON_BEAM_ON_ANIMATION) { 702 if (!mElectronBeamOnAnimator.isStarted()) { 703 if (mPowerState.getElectronBeamLevel() == 1.0f) { 704 mPowerState.dismissElectronBeam(); 705 } else if (mPowerState.prepareElectronBeam( 706 mElectronBeamFadesConfig ? 707 ElectronBeam.MODE_FADE : 708 ElectronBeam.MODE_WARM_UP)) { 709 mElectronBeamOnAnimator.start(); 710 } else { 711 mElectronBeamOnAnimator.end(); 712 } 713 } 714 } else { 715 mPowerState.setElectronBeamLevel(1.0f); 716 mPowerState.dismissElectronBeam(); 717 } 718 } 719 } 720 } else { 721 // Want screen off. 722 // Wait for previous on animation to complete beforehand. 723 unblockScreenOn(); 724 if (!mElectronBeamOnAnimator.isStarted()) { 725 if (!mElectronBeamOffAnimator.isStarted()) { 726 if (mPowerState.getElectronBeamLevel() == 0.0f) { 727 setScreenState(Display.STATE_OFF); 728 } else if (mPowerState.prepareElectronBeam( 729 mElectronBeamFadesConfig ? 730 ElectronBeam.MODE_FADE : 731 ElectronBeam.MODE_COOL_DOWN) 732 && mPowerState.getScreenState() != Display.STATE_OFF) { 733 mElectronBeamOffAnimator.start(); 734 } else { 735 mElectronBeamOffAnimator.end(); 736 } 737 } 738 } 739 } 740 741 // Report whether the display is ready for use. 742 // We mostly care about the screen state here, ignoring brightness changes 743 // which will be handled asynchronously. 744 if (mustNotify 745 && !mScreenOnWasBlocked 746 && !mElectronBeamOnAnimator.isStarted() 747 && !mElectronBeamOffAnimator.isStarted() 748 && mPowerState.waitUntilClean(mCleanListener)) { 749 synchronized (mLock) { 750 if (!mPendingRequestChangedLocked) { 751 mDisplayReadyLocked = true; 752 753 if (DEBUG) { 754 Slog.d(TAG, "Display ready!"); 755 } 756 } 757 } 758 sendOnStateChangedWithWakelock(); 759 } 760 } 761 762 private void blockScreenOn() { 763 if (!mScreenOnWasBlocked) { 764 mScreenOnWasBlocked = true; 765 mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime(); 766 if (DEBUG) { 767 Slog.d(TAG, "Blocked screen on."); 768 } 769 } 770 } 771 772 private void unblockScreenOn() { 773 if (mScreenOnWasBlocked) { 774 mScreenOnWasBlocked = false; 775 long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime; 776 if (delay > 1000 || DEBUG) { 777 Slog.d(TAG, "Unblocked screen on after " + delay + " ms"); 778 } 779 } 780 } 781 782 private void setScreenState(int state) { 783 if (mPowerState.getScreenState() != state) { 784 mPowerState.setScreenState(state); 785 try { 786 if (state != Display.STATE_OFF) { 787 mBatteryStats.noteScreenOn(); 788 } else { 789 mBatteryStats.noteScreenOff(); 790 } 791 } catch (RemoteException ex) { 792 // same process 793 } 794 } 795 } 796 797 private int clampScreenBrightness(int value) { 798 return clamp(value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 799 } 800 801 private static int clampAbsoluteBrightness(int value) { 802 return clamp(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON); 803 } 804 805 private static int clamp(int value, int min, int max) { 806 if (value <= min) { 807 return min; 808 } 809 if (value >= max) { 810 return max; 811 } 812 return value; 813 } 814 815 private static float normalizeAbsoluteBrightness(int value) { 816 return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON; 817 } 818 819 private void animateScreenBrightness(int target, int rate) { 820 if (mScreenBrightnessRampAnimator.animateTo(target, rate)) { 821 try { 822 mBatteryStats.noteScreenBrightness(target); 823 } catch (RemoteException ex) { 824 // same process 825 } 826 } 827 } 828 829 private final Runnable mCleanListener = new Runnable() { 830 @Override 831 public void run() { 832 sendUpdatePowerState(); 833 } 834 }; 835 836 private void setProximitySensorEnabled(boolean enable) { 837 if (enable) { 838 if (!mProximitySensorEnabled) { 839 // Register the listener. 840 // Proximity sensor state already cleared initially. 841 mProximitySensorEnabled = true; 842 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor, 843 SensorManager.SENSOR_DELAY_NORMAL, mHandler); 844 } 845 } else { 846 if (mProximitySensorEnabled) { 847 // Unregister the listener. 848 // Clear the proximity sensor state for next time. 849 mProximitySensorEnabled = false; 850 mProximity = PROXIMITY_UNKNOWN; 851 mPendingProximity = PROXIMITY_UNKNOWN; 852 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 853 mSensorManager.unregisterListener(mProximitySensorListener); 854 clearPendingProximityDebounceTime(); // release wake lock (must be last) 855 } 856 } 857 } 858 859 private void handleProximitySensorEvent(long time, boolean positive) { 860 if (mProximitySensorEnabled) { 861 if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) { 862 return; // no change 863 } 864 if (mPendingProximity == PROXIMITY_POSITIVE && positive) { 865 return; // no change 866 } 867 868 // Only accept a proximity sensor reading if it remains 869 // stable for the entire debounce delay. We hold a wake lock while 870 // debouncing the sensor. 871 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 872 if (positive) { 873 mPendingProximity = PROXIMITY_POSITIVE; 874 setPendingProximityDebounceTime( 875 time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock 876 } else { 877 mPendingProximity = PROXIMITY_NEGATIVE; 878 setPendingProximityDebounceTime( 879 time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock 880 } 881 882 // Debounce the new sensor reading. 883 debounceProximitySensor(); 884 } 885 } 886 887 private void debounceProximitySensor() { 888 if (mProximitySensorEnabled 889 && mPendingProximity != PROXIMITY_UNKNOWN 890 && mPendingProximityDebounceTime >= 0) { 891 final long now = SystemClock.uptimeMillis(); 892 if (mPendingProximityDebounceTime <= now) { 893 // Sensor reading accepted. Apply the change then release the wake lock. 894 mProximity = mPendingProximity; 895 updatePowerState(); 896 clearPendingProximityDebounceTime(); // release wake lock (must be last) 897 } else { 898 // Need to wait a little longer. 899 // Debounce again later. We continue holding a wake lock while waiting. 900 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED); 901 msg.setAsynchronous(true); 902 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime); 903 } 904 } 905 } 906 907 private void clearPendingProximityDebounceTime() { 908 if (mPendingProximityDebounceTime >= 0) { 909 mPendingProximityDebounceTime = -1; 910 mCallbacks.releaseSuspendBlocker(); // release wake lock 911 } 912 } 913 914 private void setPendingProximityDebounceTime(long debounceTime) { 915 if (mPendingProximityDebounceTime < 0) { 916 mCallbacks.acquireSuspendBlocker(); // acquire wake lock 917 } 918 mPendingProximityDebounceTime = debounceTime; 919 } 920 921 private void setLightSensorEnabled(boolean enable, boolean updateAutoBrightness) { 922 if (enable) { 923 if (!mLightSensorEnabled) { 924 updateAutoBrightness = true; 925 mLightSensorEnabled = true; 926 mLightSensorEnableTime = SystemClock.uptimeMillis(); 927 mSensorManager.registerListener(mLightSensorListener, mLightSensor, 928 LIGHT_SENSOR_RATE_MILLIS * 1000, mHandler); 929 } 930 } else { 931 if (mLightSensorEnabled) { 932 mLightSensorEnabled = false; 933 mAmbientLuxValid = false; 934 mRecentLightSamples = 0; 935 mHandler.removeMessages(MSG_LIGHT_SENSOR_DEBOUNCED); 936 mSensorManager.unregisterListener(mLightSensorListener); 937 } 938 } 939 if (updateAutoBrightness) { 940 updateAutoBrightness(false); 941 } 942 } 943 944 private void handleLightSensorEvent(long time, float lux) { 945 mHandler.removeMessages(MSG_LIGHT_SENSOR_DEBOUNCED); 946 947 applyLightSensorMeasurement(time, lux); 948 updateAmbientLux(time); 949 } 950 951 private void applyLightSensorMeasurement(long time, float lux) { 952 // Update our filters. 953 mRecentLightSamples += 1; 954 if (mRecentLightSamples == 1) { 955 mRecentShortTermAverageLux = lux; 956 mRecentLongTermAverageLux = lux; 957 } else { 958 final long timeDelta = time - mLastObservedLuxTime; 959 mRecentShortTermAverageLux += (lux - mRecentShortTermAverageLux) 960 * timeDelta / (SHORT_TERM_AVERAGE_LIGHT_TIME_CONSTANT + timeDelta); 961 mRecentLongTermAverageLux += (lux - mRecentLongTermAverageLux) 962 * timeDelta / (LONG_TERM_AVERAGE_LIGHT_TIME_CONSTANT + timeDelta); 963 } 964 965 // Remember this sample value. 966 mLastObservedLux = lux; 967 mLastObservedLuxTime = time; 968 } 969 970 private void setAmbientLux(float lux) { 971 mAmbientLux = lux; 972 mBrighteningLuxThreshold = mAmbientLux * (1.0f + BRIGHTENING_LIGHT_HYSTERESIS); 973 mDarkeningLuxThreshold = mAmbientLux * (1.0f - DARKENING_LIGHT_HYSTERESIS); 974 } 975 976 private void updateAmbientLux(long time) { 977 // If the light sensor was just turned on then immediately update our initial 978 // estimate of the current ambient light level. 979 if (!mAmbientLuxValid) { 980 final long timeWhenSensorWarmedUp = 981 mLightSensorWarmUpTimeConfig + mLightSensorEnableTime; 982 if (time < timeWhenSensorWarmedUp) { 983 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, 984 timeWhenSensorWarmedUp); 985 return; 986 } 987 setAmbientLux(mRecentShortTermAverageLux); 988 mAmbientLuxValid = true; 989 mDebounceLuxDirection = 0; 990 mDebounceLuxTime = time; 991 if (DEBUG) { 992 Slog.d(TAG, "updateAmbientLux: Initializing: " 993 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 994 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 995 + ", mAmbientLux=" + mAmbientLux); 996 } 997 updateAutoBrightness(true); 998 } else if (mRecentShortTermAverageLux > mBrighteningLuxThreshold 999 && mRecentLongTermAverageLux > mBrighteningLuxThreshold) { 1000 // The ambient environment appears to be brightening. 1001 if (mDebounceLuxDirection <= 0) { 1002 mDebounceLuxDirection = 1; 1003 mDebounceLuxTime = time; 1004 if (DEBUG) { 1005 Slog.d(TAG, "updateAmbientLux: Possibly brightened, waiting for " 1006 + BRIGHTENING_LIGHT_DEBOUNCE + " ms: " 1007 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1008 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1009 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1010 + ", mAmbientLux=" + mAmbientLux); 1011 } 1012 } 1013 long debounceTime = mDebounceLuxTime + BRIGHTENING_LIGHT_DEBOUNCE; 1014 if (time < debounceTime) { 1015 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, debounceTime); 1016 return; 1017 } 1018 setAmbientLux(mRecentShortTermAverageLux); 1019 if (DEBUG) { 1020 Slog.d(TAG, "updateAmbientLux: Brightened: " 1021 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1022 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1023 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1024 + ", mAmbientLux=" + mAmbientLux); 1025 } 1026 updateAutoBrightness(true); 1027 } else if (mRecentShortTermAverageLux < mDarkeningLuxThreshold 1028 && mRecentLongTermAverageLux < mDarkeningLuxThreshold) { 1029 // The ambient environment appears to be darkening. 1030 if (mDebounceLuxDirection >= 0) { 1031 mDebounceLuxDirection = -1; 1032 mDebounceLuxTime = time; 1033 if (DEBUG) { 1034 Slog.d(TAG, "updateAmbientLux: Possibly darkened, waiting for " 1035 + DARKENING_LIGHT_DEBOUNCE + " ms: " 1036 + "mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1037 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1038 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1039 + ", mAmbientLux=" + mAmbientLux); 1040 } 1041 } 1042 long debounceTime = mDebounceLuxTime + DARKENING_LIGHT_DEBOUNCE; 1043 if (time < debounceTime) { 1044 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, debounceTime); 1045 return; 1046 } 1047 // Be conservative about reducing the brightness, only reduce it a little bit 1048 // at a time to avoid having to bump it up again soon. 1049 setAmbientLux(Math.max(mRecentShortTermAverageLux, mRecentLongTermAverageLux)); 1050 if (DEBUG) { 1051 Slog.d(TAG, "updateAmbientLux: Darkened: " 1052 + "mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1053 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1054 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1055 + ", mAmbientLux=" + mAmbientLux); 1056 } 1057 updateAutoBrightness(true); 1058 } else if (mDebounceLuxDirection != 0) { 1059 // No change or change is within the hysteresis thresholds. 1060 mDebounceLuxDirection = 0; 1061 mDebounceLuxTime = time; 1062 if (DEBUG) { 1063 Slog.d(TAG, "updateAmbientLux: Canceled debounce: " 1064 + "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold 1065 + ", mDarkeningLuxThreshold=" + mDarkeningLuxThreshold 1066 + ", mRecentShortTermAverageLux=" + mRecentShortTermAverageLux 1067 + ", mRecentLongTermAverageLux=" + mRecentLongTermAverageLux 1068 + ", mAmbientLux=" + mAmbientLux); 1069 } 1070 } 1071 1072 // Now that we've done all of that, we haven't yet posted a debounce 1073 // message. So consider the case where current lux is beyond the 1074 // threshold. It's possible that the light sensor may not report values 1075 // if the light level does not change, so we need to occasionally 1076 // synthesize sensor readings in order to make sure the brightness is 1077 // adjusted accordingly. Note these thresholds may have changed since 1078 // we entered the function because we called setAmbientLux and 1079 // updateAutoBrightness along the way. 1080 if (mLastObservedLux > mBrighteningLuxThreshold 1081 || mLastObservedLux < mDarkeningLuxThreshold) { 1082 mHandler.sendEmptyMessageAtTime(MSG_LIGHT_SENSOR_DEBOUNCED, 1083 time + SYNTHETIC_LIGHT_SENSOR_RATE_MILLIS); 1084 } 1085 } 1086 1087 private void debounceLightSensor() { 1088 if (mLightSensorEnabled) { 1089 long time = SystemClock.uptimeMillis(); 1090 if (time >= mLastObservedLuxTime + SYNTHETIC_LIGHT_SENSOR_RATE_MILLIS) { 1091 if (DEBUG) { 1092 Slog.d(TAG, "debounceLightSensor: Synthesizing light sensor measurement " 1093 + "after " + (time - mLastObservedLuxTime) + " ms."); 1094 } 1095 applyLightSensorMeasurement(time, mLastObservedLux); 1096 } 1097 updateAmbientLux(time); 1098 } 1099 } 1100 1101 private void updateAutoBrightness(boolean sendUpdate) { 1102 if (!mAmbientLuxValid) { 1103 return; 1104 } 1105 1106 float value = mScreenAutoBrightnessSpline.interpolate(mAmbientLux); 1107 float gamma = 1.0f; 1108 1109 if (USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT 1110 && mPowerRequest.screenAutoBrightnessAdjustment != 0.0f) { 1111 final float adjGamma = FloatMath.pow(SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA, 1112 Math.min(1.0f, Math.max(-1.0f, 1113 -mPowerRequest.screenAutoBrightnessAdjustment))); 1114 gamma *= adjGamma; 1115 if (DEBUG) { 1116 Slog.d(TAG, "updateAutoBrightness: adjGamma=" + adjGamma); 1117 } 1118 } 1119 1120 if (USE_TWILIGHT_ADJUSTMENT) { 1121 TwilightState state = mTwilight.getCurrentState(); 1122 if (state != null && state.isNight()) { 1123 final long now = System.currentTimeMillis(); 1124 final float earlyGamma = 1125 getTwilightGamma(now, state.getYesterdaySunset(), state.getTodaySunrise()); 1126 final float lateGamma = 1127 getTwilightGamma(now, state.getTodaySunset(), state.getTomorrowSunrise()); 1128 gamma *= earlyGamma * lateGamma; 1129 if (DEBUG) { 1130 Slog.d(TAG, "updateAutoBrightness: earlyGamma=" + earlyGamma 1131 + ", lateGamma=" + lateGamma); 1132 } 1133 } 1134 } 1135 1136 if (gamma != 1.0f) { 1137 final float in = value; 1138 value = FloatMath.pow(value, gamma); 1139 if (DEBUG) { 1140 Slog.d(TAG, "updateAutoBrightness: gamma=" + gamma 1141 + ", in=" + in + ", out=" + value); 1142 } 1143 } 1144 1145 int newScreenAutoBrightness = clampScreenBrightness( 1146 Math.round(value * PowerManager.BRIGHTNESS_ON)); 1147 if (mScreenAutoBrightness != newScreenAutoBrightness) { 1148 if (DEBUG) { 1149 Slog.d(TAG, "updateAutoBrightness: mScreenAutoBrightness=" 1150 + mScreenAutoBrightness + ", newScreenAutoBrightness=" 1151 + newScreenAutoBrightness); 1152 } 1153 1154 mScreenAutoBrightness = newScreenAutoBrightness; 1155 mLastScreenAutoBrightnessGamma = gamma; 1156 if (sendUpdate) { 1157 sendUpdatePowerState(); 1158 } 1159 } 1160 } 1161 1162 private static float getTwilightGamma(long now, long lastSunset, long nextSunrise) { 1163 if (lastSunset < 0 || nextSunrise < 0 1164 || now < lastSunset || now > nextSunrise) { 1165 return 1.0f; 1166 } 1167 1168 if (now < lastSunset + TWILIGHT_ADJUSTMENT_TIME) { 1169 return lerp(1.0f, TWILIGHT_ADJUSTMENT_MAX_GAMMA, 1170 (float)(now - lastSunset) / TWILIGHT_ADJUSTMENT_TIME); 1171 } 1172 1173 if (now > nextSunrise - TWILIGHT_ADJUSTMENT_TIME) { 1174 return lerp(1.0f, TWILIGHT_ADJUSTMENT_MAX_GAMMA, 1175 (float)(nextSunrise - now) / TWILIGHT_ADJUSTMENT_TIME); 1176 } 1177 1178 return TWILIGHT_ADJUSTMENT_MAX_GAMMA; 1179 } 1180 1181 private static float lerp(float x, float y, float alpha) { 1182 return x + (y - x) * alpha; 1183 } 1184 1185 private void sendOnStateChangedWithWakelock() { 1186 mCallbacks.acquireSuspendBlocker(); 1187 mHandler.post(mOnStateChangedRunnable); 1188 } 1189 1190 private final Runnable mOnStateChangedRunnable = new Runnable() { 1191 @Override 1192 public void run() { 1193 mCallbacks.onStateChanged(); 1194 mCallbacks.releaseSuspendBlocker(); 1195 } 1196 }; 1197 1198 private void sendOnProximityPositiveWithWakelock() { 1199 mCallbacks.acquireSuspendBlocker(); 1200 mHandler.post(mOnProximityPositiveRunnable); 1201 } 1202 1203 private final Runnable mOnProximityPositiveRunnable = new Runnable() { 1204 @Override 1205 public void run() { 1206 mCallbacks.onProximityPositive(); 1207 mCallbacks.releaseSuspendBlocker(); 1208 } 1209 }; 1210 1211 private void sendOnProximityNegativeWithWakelock() { 1212 mCallbacks.acquireSuspendBlocker(); 1213 mHandler.post(mOnProximityNegativeRunnable); 1214 } 1215 1216 private final Runnable mOnProximityNegativeRunnable = new Runnable() { 1217 @Override 1218 public void run() { 1219 mCallbacks.onProximityNegative(); 1220 mCallbacks.releaseSuspendBlocker(); 1221 } 1222 }; 1223 1224 public void dump(final PrintWriter pw) { 1225 synchronized (mLock) { 1226 pw.println(); 1227 pw.println("Display Power Controller Locked State:"); 1228 pw.println(" mDisplayReadyLocked=" + mDisplayReadyLocked); 1229 pw.println(" mPendingRequestLocked=" + mPendingRequestLocked); 1230 pw.println(" mPendingRequestChangedLocked=" + mPendingRequestChangedLocked); 1231 pw.println(" mPendingWaitForNegativeProximityLocked=" 1232 + mPendingWaitForNegativeProximityLocked); 1233 pw.println(" mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked); 1234 } 1235 1236 pw.println(); 1237 pw.println("Display Power Controller Configuration:"); 1238 pw.println(" mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig); 1239 pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig); 1240 pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 1241 pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 1242 pw.println(" mUseSoftwareAutoBrightnessConfig=" 1243 + mUseSoftwareAutoBrightnessConfig); 1244 pw.println(" mScreenAutoBrightnessSpline=" + mScreenAutoBrightnessSpline); 1245 pw.println(" mLightSensorWarmUpTimeConfig=" + mLightSensorWarmUpTimeConfig); 1246 1247 mHandler.runWithScissors(new Runnable() { 1248 @Override 1249 public void run() { 1250 dumpLocal(pw); 1251 } 1252 }, 1000); 1253 } 1254 1255 private void dumpLocal(PrintWriter pw) { 1256 pw.println(); 1257 pw.println("Display Power Controller Thread State:"); 1258 pw.println(" mPowerRequest=" + mPowerRequest); 1259 pw.println(" mWaitingForNegativeProximity=" + mWaitingForNegativeProximity); 1260 1261 pw.println(" mProximitySensor=" + mProximitySensor); 1262 pw.println(" mProximitySensorEnabled=" + mProximitySensorEnabled); 1263 pw.println(" mProximityThreshold=" + mProximityThreshold); 1264 pw.println(" mProximity=" + proximityToString(mProximity)); 1265 pw.println(" mPendingProximity=" + proximityToString(mPendingProximity)); 1266 pw.println(" mPendingProximityDebounceTime=" 1267 + TimeUtils.formatUptime(mPendingProximityDebounceTime)); 1268 pw.println(" mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity); 1269 1270 pw.println(" mLightSensor=" + mLightSensor); 1271 pw.println(" mLightSensorEnabled=" + mLightSensorEnabled); 1272 pw.println(" mLightSensorEnableTime=" 1273 + TimeUtils.formatUptime(mLightSensorEnableTime)); 1274 pw.println(" mAmbientLux=" + mAmbientLux); 1275 pw.println(" mAmbientLuxValid=" + mAmbientLuxValid); 1276 pw.println(" mLastObservedLux=" + mLastObservedLux); 1277 pw.println(" mLastObservedLuxTime=" 1278 + TimeUtils.formatUptime(mLastObservedLuxTime)); 1279 pw.println(" mRecentLightSamples=" + mRecentLightSamples); 1280 pw.println(" mRecentShortTermAverageLux=" + mRecentShortTermAverageLux); 1281 pw.println(" mRecentLongTermAverageLux=" + mRecentLongTermAverageLux); 1282 pw.println(" mDebounceLuxDirection=" + mDebounceLuxDirection); 1283 pw.println(" mDebounceLuxTime=" + TimeUtils.formatUptime(mDebounceLuxTime)); 1284 pw.println(" mScreenAutoBrightness=" + mScreenAutoBrightness); 1285 pw.println(" mUsingScreenAutoBrightness=" + mUsingScreenAutoBrightness); 1286 pw.println(" mLastScreenAutoBrightnessGamma=" + mLastScreenAutoBrightnessGamma); 1287 pw.println(" mTwilight.getCurrentState()=" + mTwilight.getCurrentState()); 1288 1289 if (mElectronBeamOnAnimator != null) { 1290 pw.println(" mElectronBeamOnAnimator.isStarted()=" + 1291 mElectronBeamOnAnimator.isStarted()); 1292 } 1293 if (mElectronBeamOffAnimator != null) { 1294 pw.println(" mElectronBeamOffAnimator.isStarted()=" + 1295 mElectronBeamOffAnimator.isStarted()); 1296 } 1297 1298 if (mPowerState != null) { 1299 mPowerState.dump(pw); 1300 } 1301 } 1302 1303 private static String proximityToString(int state) { 1304 switch (state) { 1305 case PROXIMITY_UNKNOWN: 1306 return "Unknown"; 1307 case PROXIMITY_NEGATIVE: 1308 return "Negative"; 1309 case PROXIMITY_POSITIVE: 1310 return "Positive"; 1311 default: 1312 return Integer.toString(state); 1313 } 1314 } 1315 1316 private final class DisplayControllerHandler extends Handler { 1317 public DisplayControllerHandler(Looper looper) { 1318 super(looper, null, true /*async*/); 1319 } 1320 1321 @Override 1322 public void handleMessage(Message msg) { 1323 switch (msg.what) { 1324 case MSG_UPDATE_POWER_STATE: 1325 updatePowerState(); 1326 break; 1327 1328 case MSG_PROXIMITY_SENSOR_DEBOUNCED: 1329 debounceProximitySensor(); 1330 break; 1331 1332 case MSG_LIGHT_SENSOR_DEBOUNCED: 1333 debounceLightSensor(); 1334 break; 1335 } 1336 } 1337 } 1338 1339 private final SensorEventListener mProximitySensorListener = new SensorEventListener() { 1340 @Override 1341 public void onSensorChanged(SensorEvent event) { 1342 if (mProximitySensorEnabled) { 1343 final long time = SystemClock.uptimeMillis(); 1344 final float distance = event.values[0]; 1345 boolean positive = distance >= 0.0f && distance < mProximityThreshold; 1346 handleProximitySensorEvent(time, positive); 1347 } 1348 } 1349 1350 @Override 1351 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1352 // Not used. 1353 } 1354 }; 1355 1356 private final SensorEventListener mLightSensorListener = new SensorEventListener() { 1357 @Override 1358 public void onSensorChanged(SensorEvent event) { 1359 if (mLightSensorEnabled) { 1360 final long time = SystemClock.uptimeMillis(); 1361 final float lux = event.values[0]; 1362 handleLightSensorEvent(time, lux); 1363 } 1364 } 1365 1366 @Override 1367 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1368 // Not used. 1369 } 1370 }; 1371 1372 private final TwilightListener mTwilightListener = new TwilightListener() { 1373 @Override 1374 public void onTwilightStateChanged() { 1375 mTwilightChanged = true; 1376 updatePowerState(); 1377 } 1378 }; 1379} 1380