DisplayPowerController.java revision 1bfd0f463e279e3ac3f133c5e0ad11ccfd73eed5
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; 23 24import android.animation.Animator; 25import android.animation.ObjectAnimator; 26import android.content.Context; 27import android.content.res.Resources; 28import android.hardware.Sensor; 29import android.hardware.SensorEvent; 30import android.hardware.SensorEventListener; 31import android.hardware.SensorManager; 32import android.hardware.display.DisplayManagerInternal.DisplayPowerCallbacks; 33import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 34import android.os.Handler; 35import android.os.Looper; 36import android.os.Message; 37import android.os.PowerManager; 38import android.os.RemoteException; 39import android.os.SystemClock; 40import android.os.Trace; 41import android.util.MathUtils; 42import android.util.Slog; 43import android.util.Spline; 44import android.util.TimeUtils; 45import android.view.Display; 46 47import java.io.PrintWriter; 48 49/** 50 * Controls the power state of the display. 51 * 52 * Handles the proximity sensor, light sensor, and animations between states 53 * including the screen off animation. 54 * 55 * This component acts independently of the rest of the power manager service. 56 * In particular, it does not share any state and it only communicates 57 * via asynchronous callbacks to inform the power manager that something has 58 * changed. 59 * 60 * Everything this class does internally is serialized on its handler although 61 * it may be accessed by other threads from the outside. 62 * 63 * Note that the power manager service guarantees that it will hold a suspend 64 * blocker as long as the display is not ready. So most of the work done here 65 * does not need to worry about holding a suspend blocker unless it happens 66 * independently of the display ready signal. 67 * 68 * For debugging, you can make the electron beam and brightness animations run 69 * slower by changing the "animator duration scale" option in Development Settings. 70 */ 71final class DisplayPowerController implements AutomaticBrightnessController.Callbacks { 72 private static final String TAG = "DisplayPowerController"; 73 74 private static boolean DEBUG = false; 75 private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false; 76 77 private static final String SCREEN_ON_BLOCKED_TRACE_NAME = "Screen on blocked"; 78 79 // If true, uses the electron beam on animation. 80 // We might want to turn this off if we cannot get a guarantee that the screen 81 // actually turns on and starts showing new content after the call to set the 82 // screen state returns. Playing the animation can also be somewhat slow. 83 private static final boolean USE_COLOR_FADE_ON_ANIMATION = false; 84 85 86 // The minimum reduction in brightness when dimmed. 87 private static final int SCREEN_DIM_MINIMUM_REDUCTION = 10; 88 89 private static final int COLOR_FADE_ON_ANIMATION_DURATION_MILLIS = 250; 90 private static final int COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS = 400; 91 92 private static final int MSG_UPDATE_POWER_STATE = 1; 93 private static final int MSG_PROXIMITY_SENSOR_DEBOUNCED = 2; 94 95 private static final int PROXIMITY_UNKNOWN = -1; 96 private static final int PROXIMITY_NEGATIVE = 0; 97 private static final int PROXIMITY_POSITIVE = 1; 98 99 // Proximity sensor debounce delay in milliseconds for positive or negative transitions. 100 private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0; 101 private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250; 102 103 // Trigger proximity if distance is less than 5 cm. 104 private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f; 105 106 // Brightness animation ramp rate in brightness units per second. 107 private static final int BRIGHTNESS_RAMP_RATE_FAST = 200; 108 private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40; 109 110 private final Object mLock = new Object(); 111 112 private final Context mContext; 113 114 // Our handler. 115 private final DisplayControllerHandler mHandler; 116 117 // Asynchronous callbacks into the power manager service. 118 // Only invoked from the handler thread while no locks are held. 119 private final DisplayPowerCallbacks mCallbacks; 120 121 // Battery stats. 122 private final IBatteryStats mBatteryStats; 123 124 // The lights service. 125 private final LightsManager mLights; 126 127 // The sensor manager. 128 private final SensorManager mSensorManager; 129 130 // The display blanker. 131 private final DisplayBlanker mBlanker; 132 133 // The proximity sensor, or null if not available or needed. 134 private Sensor mProximitySensor; 135 136 // The doze screen brightness. 137 private final int mScreenBrightnessDozeConfig; 138 139 // The dim screen brightness. 140 private final int mScreenBrightnessDimConfig; 141 142 // The minimum screen brightness to use in a very dark room. 143 private final int mScreenBrightnessDarkConfig; 144 145 // The minimum allowed brightness. 146 private final int mScreenBrightnessRangeMinimum; 147 148 // The maximum allowed brightness. 149 private final int mScreenBrightnessRangeMaximum; 150 151 // True if auto-brightness should be used. 152 private boolean mUseSoftwareAutoBrightnessConfig; 153 154 // True if we should fade the screen while turning it off, false if we should play 155 // a stylish electron beam animation instead. 156 private boolean mColorFadeFadesConfig; 157 158 // The pending power request. 159 // Initially null until the first call to requestPowerState. 160 // Guarded by mLock. 161 private DisplayPowerRequest mPendingRequestLocked; 162 163 // True if a request has been made to wait for the proximity sensor to go negative. 164 // Guarded by mLock. 165 private boolean mPendingWaitForNegativeProximityLocked; 166 167 // True if the pending power request or wait for negative proximity flag 168 // has been changed since the last update occurred. 169 // Guarded by mLock. 170 private boolean mPendingRequestChangedLocked; 171 172 // Set to true when the important parts of the pending power request have been applied. 173 // The important parts are mainly the screen state. Brightness changes may occur 174 // concurrently. 175 // Guarded by mLock. 176 private boolean mDisplayReadyLocked; 177 178 // Set to true if a power state update is required. 179 // Guarded by mLock. 180 private boolean mPendingUpdatePowerStateLocked; 181 182 /* The following state must only be accessed by the handler thread. */ 183 184 // The currently requested power state. 185 // The power controller will progressively update its internal state to match 186 // the requested power state. Initially null until the first update. 187 private DisplayPowerRequest mPowerRequest; 188 189 // The current power state. 190 // Must only be accessed on the handler thread. 191 private DisplayPowerState mPowerState; 192 193 // True if the device should wait for negative proximity sensor before 194 // waking up the screen. This is set to false as soon as a negative 195 // proximity sensor measurement is observed or when the device is forced to 196 // go to sleep by the user. While true, the screen remains off. 197 private boolean mWaitingForNegativeProximity; 198 199 // The actual proximity sensor threshold value. 200 private float mProximityThreshold; 201 202 // Set to true if the proximity sensor listener has been registered 203 // with the sensor manager. 204 private boolean mProximitySensorEnabled; 205 206 // The debounced proximity sensor state. 207 private int mProximity = PROXIMITY_UNKNOWN; 208 209 // The raw non-debounced proximity sensor state. 210 private int mPendingProximity = PROXIMITY_UNKNOWN; 211 private long mPendingProximityDebounceTime = -1; // -1 if fully debounced 212 213 // True if the screen was turned off because of the proximity sensor. 214 // When the screen turns on again, we report user activity to the power manager. 215 private boolean mScreenOffBecauseOfProximity; 216 217 // True if the screen on is being blocked. 218 private boolean mScreenOnWasBlocked; 219 220 // The elapsed real time when the screen on was blocked. 221 private long mScreenOnBlockStartRealTime; 222 223 // Remembers whether certain kinds of brightness adjustments 224 // were recently applied so that we can decide how to transition. 225 private boolean mAppliedAutoBrightness; 226 private boolean mAppliedDimming; 227 private boolean mAppliedLowPower; 228 229 // The controller for the automatic brightness level. 230 private AutomaticBrightnessController mAutomaticBrightnessController; 231 232 // Animators. 233 private ObjectAnimator mColorFadeOnAnimator; 234 private ObjectAnimator mColorFadeOffAnimator; 235 private RampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator; 236 237 /** 238 * Creates the display power controller. 239 */ 240 public DisplayPowerController(Context context, 241 DisplayPowerCallbacks callbacks, Handler handler, 242 SensorManager sensorManager, DisplayBlanker blanker) { 243 mHandler = new DisplayControllerHandler(handler.getLooper()); 244 mCallbacks = callbacks; 245 246 mBatteryStats = BatteryStatsService.getService(); 247 mLights = LocalServices.getService(LightsManager.class); 248 mSensorManager = sensorManager; 249 mBlanker = blanker; 250 mContext = context; 251 252 final Resources resources = context.getResources(); 253 final int screenBrightnessSettingMinimum = clampAbsoluteBrightness(resources.getInteger( 254 com.android.internal.R.integer.config_screenBrightnessSettingMinimum)); 255 256 mScreenBrightnessDozeConfig = clampAbsoluteBrightness(resources.getInteger( 257 com.android.internal.R.integer.config_screenBrightnessDoze)); 258 259 mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger( 260 com.android.internal.R.integer.config_screenBrightnessDim)); 261 262 mScreenBrightnessDarkConfig = clampAbsoluteBrightness(resources.getInteger( 263 com.android.internal.R.integer.config_screenBrightnessDark)); 264 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 265 Slog.w(TAG, "Expected config_screenBrightnessDark (" 266 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 267 + "config_screenBrightnessDim (" + mScreenBrightnessDimConfig + ")."); 268 } 269 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 270 Slog.w(TAG, "Expected config_screenBrightnessDark (" 271 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 272 + "config_screenBrightnessSettingMinimum (" 273 + screenBrightnessSettingMinimum + ")."); 274 } 275 276 int screenBrightnessRangeMinimum = Math.min(Math.min( 277 screenBrightnessSettingMinimum, mScreenBrightnessDimConfig), 278 mScreenBrightnessDarkConfig); 279 280 mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON; 281 282 mUseSoftwareAutoBrightnessConfig = resources.getBoolean( 283 com.android.internal.R.bool.config_automatic_brightness_available); 284 if (mUseSoftwareAutoBrightnessConfig) { 285 int[] lux = resources.getIntArray( 286 com.android.internal.R.array.config_autoBrightnessLevels); 287 int[] screenBrightness = resources.getIntArray( 288 com.android.internal.R.array.config_autoBrightnessLcdBacklightValues); 289 int lightSensorWarmUpTimeConfig = resources.getInteger( 290 com.android.internal.R.integer.config_lightSensorWarmupTime); 291 292 Spline screenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness); 293 if (screenAutoBrightnessSpline == null) { 294 Slog.e(TAG, "Error in config.xml. config_autoBrightnessLcdBacklightValues " 295 + "(size " + screenBrightness.length + ") " 296 + "must be monotic and have exactly one more entry than " 297 + "config_autoBrightnessLevels (size " + lux.length + ") " 298 + "which must be strictly increasing. " 299 + "Auto-brightness will be disabled."); 300 mUseSoftwareAutoBrightnessConfig = false; 301 } else { 302 int bottom = clampAbsoluteBrightness(screenBrightness[0]); 303 if (mScreenBrightnessDarkConfig > bottom) { 304 Slog.w(TAG, "config_screenBrightnessDark (" + mScreenBrightnessDarkConfig 305 + ") should be less than or equal to the first value of " 306 + "config_autoBrightnessLcdBacklightValues (" 307 + bottom + ")."); 308 } 309 if (bottom < screenBrightnessRangeMinimum) { 310 screenBrightnessRangeMinimum = bottom; 311 } 312 mAutomaticBrightnessController = new AutomaticBrightnessController(this, 313 handler.getLooper(), sensorManager, screenAutoBrightnessSpline, 314 lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum, 315 mScreenBrightnessRangeMaximum); 316 } 317 } 318 319 mScreenBrightnessRangeMinimum = screenBrightnessRangeMinimum; 320 321 mColorFadeFadesConfig = resources.getBoolean( 322 com.android.internal.R.bool.config_animateScreenLights); 323 324 if (!DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) { 325 mProximitySensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); 326 if (mProximitySensor != null) { 327 mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(), 328 TYPICAL_PROXIMITY_THRESHOLD); 329 } 330 } 331 332 } 333 334 /** 335 * Returns true if the proximity sensor screen-off function is available. 336 */ 337 public boolean isProximitySensorAvailable() { 338 return mProximitySensor != null; 339 } 340 341 /** 342 * Requests a new power state. 343 * The controller makes a copy of the provided object and then 344 * begins adjusting the power state to match what was requested. 345 * 346 * @param request The requested power state. 347 * @param waitForNegativeProximity If true, issues a request to wait for 348 * negative proximity before turning the screen back on, assuming the screen 349 * was turned off by the proximity sensor. 350 * @return True if display is ready, false if there are important changes that must 351 * be made asynchronously (such as turning the screen on), in which case the caller 352 * should grab a wake lock, watch for {@link Callbacks#onStateChanged()} then try 353 * the request again later until the state converges. 354 */ 355 public boolean requestPowerState(DisplayPowerRequest request, 356 boolean waitForNegativeProximity) { 357 if (DEBUG) { 358 Slog.d(TAG, "requestPowerState: " 359 + request + ", waitForNegativeProximity=" + waitForNegativeProximity); 360 } 361 362 synchronized (mLock) { 363 boolean changed = false; 364 365 if (waitForNegativeProximity 366 && !mPendingWaitForNegativeProximityLocked) { 367 mPendingWaitForNegativeProximityLocked = true; 368 changed = true; 369 } 370 371 if (mPendingRequestLocked == null) { 372 mPendingRequestLocked = new DisplayPowerRequest(request); 373 changed = true; 374 } else if (!mPendingRequestLocked.equals(request)) { 375 mPendingRequestLocked.copyFrom(request); 376 changed = true; 377 } 378 379 if (changed) { 380 mDisplayReadyLocked = false; 381 } 382 383 if (changed && !mPendingRequestChangedLocked) { 384 mPendingRequestChangedLocked = true; 385 sendUpdatePowerStateLocked(); 386 } 387 388 return mDisplayReadyLocked; 389 } 390 } 391 392 private void sendUpdatePowerState() { 393 synchronized (mLock) { 394 sendUpdatePowerStateLocked(); 395 } 396 } 397 398 private void sendUpdatePowerStateLocked() { 399 if (!mPendingUpdatePowerStateLocked) { 400 mPendingUpdatePowerStateLocked = true; 401 Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE); 402 msg.setAsynchronous(true); 403 mHandler.sendMessage(msg); 404 } 405 } 406 407 private void initialize() { 408 // Initialize the power state object for the default display. 409 // In the future, we might manage multiple displays independently. 410 mPowerState = new DisplayPowerState(mBlanker, 411 mLights.getLight(LightsManager.LIGHT_ID_BACKLIGHT), 412 new ColorFade(Display.DEFAULT_DISPLAY)); 413 414 mColorFadeOnAnimator = ObjectAnimator.ofFloat( 415 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 0.0f, 1.0f); 416 mColorFadeOnAnimator.setDuration(COLOR_FADE_ON_ANIMATION_DURATION_MILLIS); 417 mColorFadeOnAnimator.addListener(mAnimatorListener); 418 419 mColorFadeOffAnimator = ObjectAnimator.ofFloat( 420 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 1.0f, 0.0f); 421 mColorFadeOffAnimator.setDuration(COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS); 422 mColorFadeOffAnimator.addListener(mAnimatorListener); 423 424 mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>( 425 mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS); 426 mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener); 427 428 // Initialize screen state for battery stats. 429 try { 430 mBatteryStats.noteScreenState(mPowerState.getScreenState()); 431 mBatteryStats.noteScreenBrightness(mPowerState.getScreenBrightness()); 432 } catch (RemoteException ex) { 433 // same process 434 } 435 } 436 437 private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() { 438 @Override 439 public void onAnimationStart(Animator animation) { 440 } 441 @Override 442 public void onAnimationEnd(Animator animation) { 443 sendUpdatePowerState(); 444 } 445 @Override 446 public void onAnimationRepeat(Animator animation) { 447 } 448 @Override 449 public void onAnimationCancel(Animator animation) { 450 } 451 }; 452 453 private final RampAnimator.Listener mRampAnimatorListener = new RampAnimator.Listener() { 454 @Override 455 public void onAnimationEnd() { 456 sendUpdatePowerState(); 457 } 458 }; 459 460 private void updatePowerState() { 461 // Update the power state request. 462 final boolean mustNotify; 463 boolean mustInitialize = false; 464 boolean autoBrightnessAdjustmentChanged = false; 465 466 synchronized (mLock) { 467 mPendingUpdatePowerStateLocked = false; 468 if (mPendingRequestLocked == null) { 469 return; // wait until first actual power request 470 } 471 472 if (mPowerRequest == null) { 473 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked); 474 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked; 475 mPendingWaitForNegativeProximityLocked = false; 476 mPendingRequestChangedLocked = false; 477 mustInitialize = true; 478 } else if (mPendingRequestChangedLocked) { 479 autoBrightnessAdjustmentChanged = (mPowerRequest.screenAutoBrightnessAdjustment 480 != mPendingRequestLocked.screenAutoBrightnessAdjustment); 481 mPowerRequest.copyFrom(mPendingRequestLocked); 482 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked; 483 mPendingWaitForNegativeProximityLocked = false; 484 mPendingRequestChangedLocked = false; 485 mDisplayReadyLocked = false; 486 } 487 488 mustNotify = !mDisplayReadyLocked; 489 } 490 491 // Initialize things the first time the power state is changed. 492 if (mustInitialize) { 493 initialize(); 494 } 495 496 // Compute the basic display state using the policy. 497 // We might override this below based on other factors. 498 int state; 499 int brightness = PowerManager.BRIGHTNESS_DEFAULT; 500 switch (mPowerRequest.policy) { 501 case DisplayPowerRequest.POLICY_OFF: 502 state = Display.STATE_OFF; 503 break; 504 case DisplayPowerRequest.POLICY_DOZE: 505 if (mPowerRequest.dozeScreenState != Display.STATE_UNKNOWN) { 506 state = mPowerRequest.dozeScreenState; 507 } else { 508 state = Display.STATE_DOZE; 509 } 510 brightness = mPowerRequest.dozeScreenBrightness; 511 break; 512 case DisplayPowerRequest.POLICY_DIM: 513 case DisplayPowerRequest.POLICY_BRIGHT: 514 default: 515 state = Display.STATE_ON; 516 break; 517 } 518 519 // Apply the proximity sensor. 520 if (mProximitySensor != null) { 521 if (mPowerRequest.useProximitySensor && state != Display.STATE_OFF) { 522 setProximitySensorEnabled(true); 523 if (!mScreenOffBecauseOfProximity 524 && mProximity == PROXIMITY_POSITIVE) { 525 mScreenOffBecauseOfProximity = true; 526 sendOnProximityPositiveWithWakelock(); 527 } 528 } else if (mWaitingForNegativeProximity 529 && mScreenOffBecauseOfProximity 530 && mProximity == PROXIMITY_POSITIVE 531 && state != Display.STATE_OFF) { 532 setProximitySensorEnabled(true); 533 } else { 534 setProximitySensorEnabled(false); 535 mWaitingForNegativeProximity = false; 536 } 537 if (mScreenOffBecauseOfProximity 538 && mProximity != PROXIMITY_POSITIVE) { 539 mScreenOffBecauseOfProximity = false; 540 sendOnProximityNegativeWithWakelock(); 541 } 542 } else { 543 mWaitingForNegativeProximity = false; 544 } 545 if (mScreenOffBecauseOfProximity) { 546 state = Display.STATE_OFF; 547 } 548 549 // Use zero brightness when screen is off. 550 if (state == Display.STATE_OFF) { 551 brightness = PowerManager.BRIGHTNESS_OFF; 552 } 553 554 // Use default brightness when dozing unless overridden. 555 if (brightness < 0 && (state == Display.STATE_DOZE 556 || state == Display.STATE_DOZE_SUSPEND)) { 557 brightness = mScreenBrightnessDozeConfig; 558 } 559 560 // Configure auto-brightness. 561 boolean autoBrightnessEnabled = false; 562 if (mAutomaticBrightnessController != null) { 563 autoBrightnessEnabled = mPowerRequest.useAutoBrightness 564 && state == Display.STATE_ON && brightness < 0; 565 mAutomaticBrightnessController.configure(autoBrightnessEnabled, 566 mPowerRequest.screenAutoBrightnessAdjustment); 567 } 568 569 // Apply auto-brightness. 570 boolean slowChange = false; 571 if (brightness < 0) { 572 if (autoBrightnessEnabled) { 573 brightness = mAutomaticBrightnessController.getAutomaticScreenBrightness(); 574 } 575 if (brightness >= 0) { 576 // Use current auto-brightness value and slowly adjust to changes. 577 brightness = clampScreenBrightness(brightness); 578 if (mAppliedAutoBrightness && !autoBrightnessAdjustmentChanged) { 579 slowChange = true; // slowly adapt to auto-brightness 580 } 581 mAppliedAutoBrightness = true; 582 } else { 583 mAppliedAutoBrightness = false; 584 } 585 } else { 586 mAppliedAutoBrightness = false; 587 } 588 589 // Apply manual brightness. 590 // Use the current brightness setting from the request, which is expected 591 // provide a nominal default value for the case where auto-brightness 592 // is not ready yet. 593 if (brightness < 0) { 594 brightness = clampScreenBrightness(mPowerRequest.screenBrightness); 595 } 596 597 // Apply dimming by at least some minimum amount when user activity 598 // timeout is about to expire. 599 if (mPowerRequest.policy == DisplayPowerRequest.POLICY_DIM) { 600 if (brightness > mScreenBrightnessRangeMinimum) { 601 brightness = Math.max(Math.min(brightness - SCREEN_DIM_MINIMUM_REDUCTION, 602 mScreenBrightnessDimConfig), mScreenBrightnessRangeMinimum); 603 } 604 if (!mAppliedDimming) { 605 slowChange = false; 606 } 607 mAppliedDimming = true; 608 } 609 610 // If low power mode is enabled, cut the brightness level by half 611 // as long as it is above the minimum threshold. 612 if (mPowerRequest.lowPowerMode) { 613 if (brightness > mScreenBrightnessRangeMinimum) { 614 brightness = Math.max(brightness / 2, mScreenBrightnessRangeMinimum); 615 } 616 if (!mAppliedLowPower) { 617 slowChange = false; 618 } 619 mAppliedLowPower = true; 620 } 621 622 // Animate the screen brightness when the screen is on. 623 if (state != Display.STATE_OFF) { 624 animateScreenBrightness(brightness, slowChange 625 ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST); 626 } 627 628 // Animate the screen on or off unless blocked. 629 if (state == Display.STATE_ON) { 630 // Want screen on. 631 // Wait for previous off animation to complete beforehand. 632 // It is relatively short but if we cancel it and switch to the 633 // on animation immediately then the results are pretty ugly. 634 if (!mColorFadeOffAnimator.isStarted()) { 635 // Turn the screen on. The contents of the screen may not yet 636 // be visible if the electron beam has not been dismissed because 637 // its last frame of animation is solid black. 638 setScreenState(Display.STATE_ON); 639 if (mPowerRequest.blockScreenOn 640 && mPowerState.getColorFadeLevel() == 0.0f) { 641 blockScreenOn(); 642 } else { 643 unblockScreenOn(); 644 if (USE_COLOR_FADE_ON_ANIMATION && mPowerRequest.isBrightOrDim()) { 645 // Perform screen on animation. 646 if (!mColorFadeOnAnimator.isStarted()) { 647 if (mPowerState.getColorFadeLevel() == 1.0f) { 648 mPowerState.dismissColorFade(); 649 } else if (mPowerState.prepareColorFade(mContext, 650 mColorFadeFadesConfig ? 651 ColorFade.MODE_FADE : 652 ColorFade.MODE_WARM_UP)) { 653 mColorFadeOnAnimator.start(); 654 } else { 655 mColorFadeOnAnimator.end(); 656 } 657 } 658 } else { 659 // Skip screen on animation. 660 mPowerState.setColorFadeLevel(1.0f); 661 mPowerState.dismissColorFade(); 662 } 663 } 664 } 665 } else if (state == Display.STATE_DOZE) { 666 // Want screen dozing. 667 // Wait for brightness animation to complete beforehand when entering doze 668 // from screen on. 669 unblockScreenOn(); 670 if (!mScreenBrightnessRampAnimator.isAnimating() 671 || mPowerState.getScreenState() != Display.STATE_ON) { 672 // Set screen state and dismiss the black surface without fanfare. 673 setScreenState(state); 674 mPowerState.setColorFadeLevel(1.0f); 675 mPowerState.dismissColorFade(); 676 } 677 } else if (state == Display.STATE_DOZE_SUSPEND) { 678 // Want screen dozing and suspended. 679 // Wait for brightness animation to complete beforehand unless already 680 // suspended because we may not be able to change it after suspension. 681 unblockScreenOn(); 682 if (!mScreenBrightnessRampAnimator.isAnimating() 683 || mPowerState.getScreenState() == Display.STATE_DOZE_SUSPEND) { 684 // Set screen state and dismiss the black surface without fanfare. 685 setScreenState(state); 686 mPowerState.setColorFadeLevel(1.0f); 687 mPowerState.dismissColorFade(); 688 } 689 } else { 690 // Want screen off. 691 // Wait for previous on animation to complete beforehand. 692 unblockScreenOn(); 693 if (!mColorFadeOnAnimator.isStarted()) { 694 if (mPowerRequest.policy == DisplayPowerRequest.POLICY_OFF) { 695 // Perform screen off animation. 696 if (!mColorFadeOffAnimator.isStarted()) { 697 if (mPowerState.getColorFadeLevel() == 0.0f) { 698 setScreenState(Display.STATE_OFF); 699 } else if (mPowerState.prepareColorFade(mContext, 700 mColorFadeFadesConfig ? 701 ColorFade.MODE_FADE : 702 ColorFade.MODE_COOL_DOWN) 703 && mPowerState.getScreenState() != Display.STATE_OFF) { 704 mColorFadeOffAnimator.start(); 705 } else { 706 mColorFadeOffAnimator.end(); 707 } 708 } 709 } else { 710 // Skip screen off animation. 711 setScreenState(Display.STATE_OFF); 712 } 713 } 714 } 715 716 // Report whether the display is ready for use. 717 // We mostly care about the screen state here, ignoring brightness changes 718 // which will be handled asynchronously. 719 if (mustNotify 720 && !mScreenOnWasBlocked 721 && !mColorFadeOnAnimator.isStarted() 722 && !mColorFadeOffAnimator.isStarted() 723 && !mScreenBrightnessRampAnimator.isAnimating() 724 && mPowerState.waitUntilClean(mCleanListener)) { 725 synchronized (mLock) { 726 if (!mPendingRequestChangedLocked) { 727 mDisplayReadyLocked = true; 728 729 if (DEBUG) { 730 Slog.d(TAG, "Display ready!"); 731 } 732 } 733 } 734 sendOnStateChangedWithWakelock(); 735 } 736 } 737 738 @Override 739 public void updateBrightness() { 740 sendUpdatePowerState(); 741 } 742 743 private void blockScreenOn() { 744 if (!mScreenOnWasBlocked) { 745 Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 746 mScreenOnWasBlocked = true; 747 mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime(); 748 Slog.i(TAG, "Blocking screen on until initial contents have been drawn."); 749 } 750 } 751 752 private void unblockScreenOn() { 753 if (mScreenOnWasBlocked) { 754 mScreenOnWasBlocked = false; 755 long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime; 756 Slog.i(TAG, "Unblocked screen on after " + delay + " ms"); 757 Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 758 } 759 } 760 761 private void setScreenState(int state) { 762 if (mPowerState.getScreenState() != state) { 763 mPowerState.setScreenState(state); 764 try { 765 mBatteryStats.noteScreenState(state); 766 } catch (RemoteException ex) { 767 // same process 768 } 769 } 770 } 771 772 private int clampScreenBrightness(int value) { 773 return MathUtils.constrain( 774 value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 775 } 776 777 private void animateScreenBrightness(int target, int rate) { 778 if (mScreenBrightnessRampAnimator.animateTo(target, rate)) { 779 try { 780 mBatteryStats.noteScreenBrightness(target); 781 } catch (RemoteException ex) { 782 // same process 783 } 784 } 785 } 786 787 private final Runnable mCleanListener = new Runnable() { 788 @Override 789 public void run() { 790 sendUpdatePowerState(); 791 } 792 }; 793 794 private void setProximitySensorEnabled(boolean enable) { 795 if (enable) { 796 if (!mProximitySensorEnabled) { 797 // Register the listener. 798 // Proximity sensor state already cleared initially. 799 mProximitySensorEnabled = true; 800 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor, 801 SensorManager.SENSOR_DELAY_NORMAL, mHandler); 802 } 803 } else { 804 if (mProximitySensorEnabled) { 805 // Unregister the listener. 806 // Clear the proximity sensor state for next time. 807 mProximitySensorEnabled = false; 808 mProximity = PROXIMITY_UNKNOWN; 809 mPendingProximity = PROXIMITY_UNKNOWN; 810 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 811 mSensorManager.unregisterListener(mProximitySensorListener); 812 clearPendingProximityDebounceTime(); // release wake lock (must be last) 813 } 814 } 815 } 816 817 private void handleProximitySensorEvent(long time, boolean positive) { 818 if (mProximitySensorEnabled) { 819 if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) { 820 return; // no change 821 } 822 if (mPendingProximity == PROXIMITY_POSITIVE && positive) { 823 return; // no change 824 } 825 826 // Only accept a proximity sensor reading if it remains 827 // stable for the entire debounce delay. We hold a wake lock while 828 // debouncing the sensor. 829 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 830 if (positive) { 831 mPendingProximity = PROXIMITY_POSITIVE; 832 setPendingProximityDebounceTime( 833 time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock 834 } else { 835 mPendingProximity = PROXIMITY_NEGATIVE; 836 setPendingProximityDebounceTime( 837 time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock 838 } 839 840 // Debounce the new sensor reading. 841 debounceProximitySensor(); 842 } 843 } 844 845 private void debounceProximitySensor() { 846 if (mProximitySensorEnabled 847 && mPendingProximity != PROXIMITY_UNKNOWN 848 && mPendingProximityDebounceTime >= 0) { 849 final long now = SystemClock.uptimeMillis(); 850 if (mPendingProximityDebounceTime <= now) { 851 // Sensor reading accepted. Apply the change then release the wake lock. 852 mProximity = mPendingProximity; 853 updatePowerState(); 854 clearPendingProximityDebounceTime(); // release wake lock (must be last) 855 } else { 856 // Need to wait a little longer. 857 // Debounce again later. We continue holding a wake lock while waiting. 858 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED); 859 msg.setAsynchronous(true); 860 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime); 861 } 862 } 863 } 864 865 private void clearPendingProximityDebounceTime() { 866 if (mPendingProximityDebounceTime >= 0) { 867 mPendingProximityDebounceTime = -1; 868 mCallbacks.releaseSuspendBlocker(); // release wake lock 869 } 870 } 871 872 private void setPendingProximityDebounceTime(long debounceTime) { 873 if (mPendingProximityDebounceTime < 0) { 874 mCallbacks.acquireSuspendBlocker(); // acquire wake lock 875 } 876 mPendingProximityDebounceTime = debounceTime; 877 } 878 879 private void sendOnStateChangedWithWakelock() { 880 mCallbacks.acquireSuspendBlocker(); 881 mHandler.post(mOnStateChangedRunnable); 882 } 883 884 private final Runnable mOnStateChangedRunnable = new Runnable() { 885 @Override 886 public void run() { 887 mCallbacks.onStateChanged(); 888 mCallbacks.releaseSuspendBlocker(); 889 } 890 }; 891 892 private void sendOnProximityPositiveWithWakelock() { 893 mCallbacks.acquireSuspendBlocker(); 894 mHandler.post(mOnProximityPositiveRunnable); 895 } 896 897 private final Runnable mOnProximityPositiveRunnable = new Runnable() { 898 @Override 899 public void run() { 900 mCallbacks.onProximityPositive(); 901 mCallbacks.releaseSuspendBlocker(); 902 } 903 }; 904 905 private void sendOnProximityNegativeWithWakelock() { 906 mCallbacks.acquireSuspendBlocker(); 907 mHandler.post(mOnProximityNegativeRunnable); 908 } 909 910 private final Runnable mOnProximityNegativeRunnable = new Runnable() { 911 @Override 912 public void run() { 913 mCallbacks.onProximityNegative(); 914 mCallbacks.releaseSuspendBlocker(); 915 } 916 }; 917 918 public void dump(final PrintWriter pw) { 919 synchronized (mLock) { 920 pw.println(); 921 pw.println("Display Power Controller Locked State:"); 922 pw.println(" mDisplayReadyLocked=" + mDisplayReadyLocked); 923 pw.println(" mPendingRequestLocked=" + mPendingRequestLocked); 924 pw.println(" mPendingRequestChangedLocked=" + mPendingRequestChangedLocked); 925 pw.println(" mPendingWaitForNegativeProximityLocked=" 926 + mPendingWaitForNegativeProximityLocked); 927 pw.println(" mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked); 928 } 929 930 pw.println(); 931 pw.println("Display Power Controller Configuration:"); 932 pw.println(" mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig); 933 pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig); 934 pw.println(" mScreenBrightnessDarkConfig=" + mScreenBrightnessDarkConfig); 935 pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 936 pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 937 pw.println(" mUseSoftwareAutoBrightnessConfig=" 938 + mUseSoftwareAutoBrightnessConfig); 939 940 mHandler.runWithScissors(new Runnable() { 941 @Override 942 public void run() { 943 dumpLocal(pw); 944 } 945 }, 1000); 946 } 947 948 private void dumpLocal(PrintWriter pw) { 949 pw.println(); 950 pw.println("Display Power Controller Thread State:"); 951 pw.println(" mPowerRequest=" + mPowerRequest); 952 pw.println(" mWaitingForNegativeProximity=" + mWaitingForNegativeProximity); 953 954 pw.println(" mProximitySensor=" + mProximitySensor); 955 pw.println(" mProximitySensorEnabled=" + mProximitySensorEnabled); 956 pw.println(" mProximityThreshold=" + mProximityThreshold); 957 pw.println(" mProximity=" + proximityToString(mProximity)); 958 pw.println(" mPendingProximity=" + proximityToString(mPendingProximity)); 959 pw.println(" mPendingProximityDebounceTime=" 960 + TimeUtils.formatUptime(mPendingProximityDebounceTime)); 961 pw.println(" mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity); 962 pw.println(" mAppliedAutoBrightness=" + mAppliedAutoBrightness); 963 pw.println(" mAppliedDimming=" + mAppliedDimming); 964 pw.println(" mAppliedLowPower=" + mAppliedLowPower); 965 966 pw.println(" mScreenBrightnessRampAnimator.isAnimating()=" + 967 mScreenBrightnessRampAnimator.isAnimating()); 968 969 if (mColorFadeOnAnimator != null) { 970 pw.println(" mColorFadeOnAnimator.isStarted()=" + 971 mColorFadeOnAnimator.isStarted()); 972 } 973 if (mColorFadeOffAnimator != null) { 974 pw.println(" mColorFadeOffAnimator.isStarted()=" + 975 mColorFadeOffAnimator.isStarted()); 976 } 977 978 if (mPowerState != null) { 979 mPowerState.dump(pw); 980 } 981 982 if (mAutomaticBrightnessController != null) { 983 mAutomaticBrightnessController.dump(pw); 984 } 985 986 } 987 988 private static String proximityToString(int state) { 989 switch (state) { 990 case PROXIMITY_UNKNOWN: 991 return "Unknown"; 992 case PROXIMITY_NEGATIVE: 993 return "Negative"; 994 case PROXIMITY_POSITIVE: 995 return "Positive"; 996 default: 997 return Integer.toString(state); 998 } 999 } 1000 1001 private static Spline createAutoBrightnessSpline(int[] lux, int[] brightness) { 1002 try { 1003 final int n = brightness.length; 1004 float[] x = new float[n]; 1005 float[] y = new float[n]; 1006 y[0] = normalizeAbsoluteBrightness(brightness[0]); 1007 for (int i = 1; i < n; i++) { 1008 x[i] = lux[i - 1]; 1009 y[i] = normalizeAbsoluteBrightness(brightness[i]); 1010 } 1011 1012 Spline spline = Spline.createMonotoneCubicSpline(x, y); 1013 if (DEBUG) { 1014 Slog.d(TAG, "Auto-brightness spline: " + spline); 1015 for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) { 1016 Slog.d(TAG, String.format(" %7.1f: %7.1f", v, spline.interpolate(v))); 1017 } 1018 } 1019 return spline; 1020 } catch (IllegalArgumentException ex) { 1021 Slog.e(TAG, "Could not create auto-brightness spline.", ex); 1022 return null; 1023 } 1024 } 1025 1026 private static float normalizeAbsoluteBrightness(int value) { 1027 return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON; 1028 } 1029 1030 private static int clampAbsoluteBrightness(int value) { 1031 return MathUtils.constrain(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON); 1032 } 1033 1034 private final class DisplayControllerHandler extends Handler { 1035 public DisplayControllerHandler(Looper looper) { 1036 super(looper, null, true /*async*/); 1037 } 1038 1039 @Override 1040 public void handleMessage(Message msg) { 1041 switch (msg.what) { 1042 case MSG_UPDATE_POWER_STATE: 1043 updatePowerState(); 1044 break; 1045 1046 case MSG_PROXIMITY_SENSOR_DEBOUNCED: 1047 debounceProximitySensor(); 1048 break; 1049 } 1050 } 1051 } 1052 1053 private final SensorEventListener mProximitySensorListener = new SensorEventListener() { 1054 @Override 1055 public void onSensorChanged(SensorEvent event) { 1056 if (mProximitySensorEnabled) { 1057 final long time = SystemClock.uptimeMillis(); 1058 final float distance = event.values[0]; 1059 boolean positive = distance >= 0.0f && distance < mProximityThreshold; 1060 handleProximitySensorEvent(time, positive); 1061 } 1062 } 1063 1064 @Override 1065 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1066 // Not used. 1067 } 1068 }; 1069} 1070