DisplayPowerController.java revision bf4e414cf0d0f512a0929ecd4e662a925d7684f0
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; 46import android.view.WindowManagerPolicy; 47 48import java.io.PrintWriter; 49 50/** 51 * Controls the power state of the display. 52 * 53 * Handles the proximity sensor, light sensor, and animations between states 54 * including the screen off animation. 55 * 56 * This component acts independently of the rest of the power manager service. 57 * In particular, it does not share any state and it only communicates 58 * via asynchronous callbacks to inform the power manager that something has 59 * changed. 60 * 61 * Everything this class does internally is serialized on its handler although 62 * it may be accessed by other threads from the outside. 63 * 64 * Note that the power manager service guarantees that it will hold a suspend 65 * blocker as long as the display is not ready. So most of the work done here 66 * does not need to worry about holding a suspend blocker unless it happens 67 * independently of the display ready signal. 68 * 69 * For debugging, you can make the color fade and brightness animations run 70 * slower by changing the "animator duration scale" option in Development Settings. 71 */ 72final class DisplayPowerController implements AutomaticBrightnessController.Callbacks { 73 private static final String TAG = "DisplayPowerController"; 74 75 private static boolean DEBUG = false; 76 private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false; 77 78 private static final String SCREEN_ON_BLOCKED_TRACE_NAME = "Screen on blocked"; 79 80 // If true, uses the color fade on animation. 81 // We might want to turn this off if we cannot get a guarantee that the screen 82 // actually turns on and starts showing new content after the call to set the 83 // screen state returns. Playing the animation can also be somewhat slow. 84 private static final boolean USE_COLOR_FADE_ON_ANIMATION = false; 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 private static final int MSG_SCREEN_ON_UNBLOCKED = 3; 95 96 private static final int PROXIMITY_UNKNOWN = -1; 97 private static final int PROXIMITY_NEGATIVE = 0; 98 private static final int PROXIMITY_POSITIVE = 1; 99 100 // Proximity sensor debounce delay in milliseconds for positive or negative transitions. 101 private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0; 102 private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250; 103 104 // Trigger proximity if distance is less than 5 cm. 105 private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f; 106 107 // Brightness animation ramp rate in brightness units per second. 108 private static final int BRIGHTNESS_RAMP_RATE_FAST = 200; 109 private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40; 110 111 private final Object mLock = new Object(); 112 113 private final Context mContext; 114 115 // Our handler. 116 private final DisplayControllerHandler mHandler; 117 118 // Asynchronous callbacks into the power manager service. 119 // Only invoked from the handler thread while no locks are held. 120 private final DisplayPowerCallbacks mCallbacks; 121 122 // Battery stats. 123 private final IBatteryStats mBatteryStats; 124 125 // The lights service. 126 private final LightsManager mLights; 127 128 // The sensor manager. 129 private final SensorManager mSensorManager; 130 131 // The window manager policy. 132 private final WindowManagerPolicy mWindowManagerPolicy; 133 134 // The display blanker. 135 private final DisplayBlanker mBlanker; 136 137 // The proximity sensor, or null if not available or needed. 138 private Sensor mProximitySensor; 139 140 // The doze screen brightness. 141 private final int mScreenBrightnessDozeConfig; 142 143 // The dim screen brightness. 144 private final int mScreenBrightnessDimConfig; 145 146 // The minimum screen brightness to use in a very dark room. 147 private final int mScreenBrightnessDarkConfig; 148 149 // The minimum allowed brightness. 150 private final int mScreenBrightnessRangeMinimum; 151 152 // The maximum allowed brightness. 153 private final int mScreenBrightnessRangeMaximum; 154 155 // True if auto-brightness should be used. 156 private boolean mUseSoftwareAutoBrightnessConfig; 157 158 // True if we should fade the screen while turning it off, false if we should play 159 // a stylish color fade animation instead. 160 private boolean mColorFadeFadesConfig; 161 162 // The pending power request. 163 // Initially null until the first call to requestPowerState. 164 // Guarded by mLock. 165 private DisplayPowerRequest mPendingRequestLocked; 166 167 // True if a request has been made to wait for the proximity sensor to go negative. 168 // Guarded by mLock. 169 private boolean mPendingWaitForNegativeProximityLocked; 170 171 // True if the pending power request or wait for negative proximity flag 172 // has been changed since the last update occurred. 173 // Guarded by mLock. 174 private boolean mPendingRequestChangedLocked; 175 176 // Set to true when the important parts of the pending power request have been applied. 177 // The important parts are mainly the screen state. Brightness changes may occur 178 // concurrently. 179 // Guarded by mLock. 180 private boolean mDisplayReadyLocked; 181 182 // Set to true if a power state update is required. 183 // Guarded by mLock. 184 private boolean mPendingUpdatePowerStateLocked; 185 186 /* The following state must only be accessed by the handler thread. */ 187 188 // The currently requested power state. 189 // The power controller will progressively update its internal state to match 190 // the requested power state. Initially null until the first update. 191 private DisplayPowerRequest mPowerRequest; 192 193 // The current power state. 194 // Must only be accessed on the handler thread. 195 private DisplayPowerState mPowerState; 196 197 // True if the device should wait for negative proximity sensor before 198 // waking up the screen. This is set to false as soon as a negative 199 // proximity sensor measurement is observed or when the device is forced to 200 // go to sleep by the user. While true, the screen remains off. 201 private boolean mWaitingForNegativeProximity; 202 203 // The actual proximity sensor threshold value. 204 private float mProximityThreshold; 205 206 // Set to true if the proximity sensor listener has been registered 207 // with the sensor manager. 208 private boolean mProximitySensorEnabled; 209 210 // The debounced proximity sensor state. 211 private int mProximity = PROXIMITY_UNKNOWN; 212 213 // The raw non-debounced proximity sensor state. 214 private int mPendingProximity = PROXIMITY_UNKNOWN; 215 private long mPendingProximityDebounceTime = -1; // -1 if fully debounced 216 217 // True if the screen was turned off because of the proximity sensor. 218 // When the screen turns on again, we report user activity to the power manager. 219 private boolean mScreenOffBecauseOfProximity; 220 221 // The currently active screen on unblocker. This field is non-null whenever 222 // we are waiting for a callback to release it and unblock the screen. 223 private ScreenOnUnblocker mPendingScreenOnUnblocker; 224 225 // True if we were in the process of turning off the screen. 226 // This allows us to recover more gracefully from situations where we abort 227 // turning off the screen. 228 private boolean mPendingScreenOff; 229 230 // True if we have unfinished business and are holding a suspend blocker. 231 private boolean mUnfinishedBusiness; 232 233 // The elapsed real time when the screen on was blocked. 234 private long mScreenOnBlockStartRealTime; 235 236 // Remembers whether certain kinds of brightness adjustments 237 // were recently applied so that we can decide how to transition. 238 private boolean mAppliedAutoBrightness; 239 private boolean mAppliedDimming; 240 private boolean mAppliedLowPower; 241 242 // The controller for the automatic brightness level. 243 private AutomaticBrightnessController mAutomaticBrightnessController; 244 245 // Animators. 246 private ObjectAnimator mColorFadeOnAnimator; 247 private ObjectAnimator mColorFadeOffAnimator; 248 private RampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator; 249 250 /** 251 * Creates the display power controller. 252 */ 253 public DisplayPowerController(Context context, 254 DisplayPowerCallbacks callbacks, Handler handler, 255 SensorManager sensorManager, DisplayBlanker blanker) { 256 mHandler = new DisplayControllerHandler(handler.getLooper()); 257 mCallbacks = callbacks; 258 259 mBatteryStats = BatteryStatsService.getService(); 260 mLights = LocalServices.getService(LightsManager.class); 261 mSensorManager = sensorManager; 262 mWindowManagerPolicy = LocalServices.getService(WindowManagerPolicy.class); 263 mBlanker = blanker; 264 mContext = context; 265 266 final Resources resources = context.getResources(); 267 final int screenBrightnessSettingMinimum = clampAbsoluteBrightness(resources.getInteger( 268 com.android.internal.R.integer.config_screenBrightnessSettingMinimum)); 269 270 mScreenBrightnessDozeConfig = clampAbsoluteBrightness(resources.getInteger( 271 com.android.internal.R.integer.config_screenBrightnessDoze)); 272 273 mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger( 274 com.android.internal.R.integer.config_screenBrightnessDim)); 275 276 mScreenBrightnessDarkConfig = clampAbsoluteBrightness(resources.getInteger( 277 com.android.internal.R.integer.config_screenBrightnessDark)); 278 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 279 Slog.w(TAG, "Expected config_screenBrightnessDark (" 280 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 281 + "config_screenBrightnessDim (" + mScreenBrightnessDimConfig + ")."); 282 } 283 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 284 Slog.w(TAG, "Expected config_screenBrightnessDark (" 285 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 286 + "config_screenBrightnessSettingMinimum (" 287 + screenBrightnessSettingMinimum + ")."); 288 } 289 290 int screenBrightnessRangeMinimum = Math.min(Math.min( 291 screenBrightnessSettingMinimum, mScreenBrightnessDimConfig), 292 mScreenBrightnessDarkConfig); 293 294 mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON; 295 296 mUseSoftwareAutoBrightnessConfig = resources.getBoolean( 297 com.android.internal.R.bool.config_automatic_brightness_available); 298 if (mUseSoftwareAutoBrightnessConfig) { 299 int[] lux = resources.getIntArray( 300 com.android.internal.R.array.config_autoBrightnessLevels); 301 int[] screenBrightness = resources.getIntArray( 302 com.android.internal.R.array.config_autoBrightnessLcdBacklightValues); 303 int lightSensorWarmUpTimeConfig = resources.getInteger( 304 com.android.internal.R.integer.config_lightSensorWarmupTime); 305 306 Spline screenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness); 307 if (screenAutoBrightnessSpline == null) { 308 Slog.e(TAG, "Error in config.xml. config_autoBrightnessLcdBacklightValues " 309 + "(size " + screenBrightness.length + ") " 310 + "must be monotic and have exactly one more entry than " 311 + "config_autoBrightnessLevels (size " + lux.length + ") " 312 + "which must be strictly increasing. " 313 + "Auto-brightness will be disabled."); 314 mUseSoftwareAutoBrightnessConfig = false; 315 } else { 316 int bottom = clampAbsoluteBrightness(screenBrightness[0]); 317 if (mScreenBrightnessDarkConfig > bottom) { 318 Slog.w(TAG, "config_screenBrightnessDark (" + mScreenBrightnessDarkConfig 319 + ") should be less than or equal to the first value of " 320 + "config_autoBrightnessLcdBacklightValues (" 321 + bottom + ")."); 322 } 323 if (bottom < screenBrightnessRangeMinimum) { 324 screenBrightnessRangeMinimum = bottom; 325 } 326 mAutomaticBrightnessController = new AutomaticBrightnessController(this, 327 handler.getLooper(), sensorManager, screenAutoBrightnessSpline, 328 lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum, 329 mScreenBrightnessRangeMaximum); 330 } 331 } 332 333 mScreenBrightnessRangeMinimum = screenBrightnessRangeMinimum; 334 335 mColorFadeFadesConfig = resources.getBoolean( 336 com.android.internal.R.bool.config_animateScreenLights); 337 338 if (!DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) { 339 mProximitySensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); 340 if (mProximitySensor != null) { 341 mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(), 342 TYPICAL_PROXIMITY_THRESHOLD); 343 } 344 } 345 346 } 347 348 /** 349 * Returns true if the proximity sensor screen-off function is available. 350 */ 351 public boolean isProximitySensorAvailable() { 352 return mProximitySensor != null; 353 } 354 355 /** 356 * Requests a new power state. 357 * The controller makes a copy of the provided object and then 358 * begins adjusting the power state to match what was requested. 359 * 360 * @param request The requested power state. 361 * @param waitForNegativeProximity If true, issues a request to wait for 362 * negative proximity before turning the screen back on, assuming the screen 363 * was turned off by the proximity sensor. 364 * @return True if display is ready, false if there are important changes that must 365 * be made asynchronously (such as turning the screen on), in which case the caller 366 * should grab a wake lock, watch for {@link DisplayPowerCallbacks#onStateChanged()} 367 * then try the request again later until the state converges. 368 */ 369 public boolean requestPowerState(DisplayPowerRequest request, 370 boolean waitForNegativeProximity) { 371 if (DEBUG) { 372 Slog.d(TAG, "requestPowerState: " 373 + request + ", waitForNegativeProximity=" + waitForNegativeProximity); 374 } 375 376 synchronized (mLock) { 377 boolean changed = false; 378 379 if (waitForNegativeProximity 380 && !mPendingWaitForNegativeProximityLocked) { 381 mPendingWaitForNegativeProximityLocked = true; 382 changed = true; 383 } 384 385 if (mPendingRequestLocked == null) { 386 mPendingRequestLocked = new DisplayPowerRequest(request); 387 changed = true; 388 } else if (!mPendingRequestLocked.equals(request)) { 389 mPendingRequestLocked.copyFrom(request); 390 changed = true; 391 } 392 393 if (changed) { 394 mDisplayReadyLocked = false; 395 } 396 397 if (changed && !mPendingRequestChangedLocked) { 398 mPendingRequestChangedLocked = true; 399 sendUpdatePowerStateLocked(); 400 } 401 402 return mDisplayReadyLocked; 403 } 404 } 405 406 private void sendUpdatePowerState() { 407 synchronized (mLock) { 408 sendUpdatePowerStateLocked(); 409 } 410 } 411 412 private void sendUpdatePowerStateLocked() { 413 if (!mPendingUpdatePowerStateLocked) { 414 mPendingUpdatePowerStateLocked = true; 415 Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE); 416 msg.setAsynchronous(true); 417 mHandler.sendMessage(msg); 418 } 419 } 420 421 private void initialize() { 422 // Initialize the power state object for the default display. 423 // In the future, we might manage multiple displays independently. 424 mPowerState = new DisplayPowerState(mBlanker, 425 mLights.getLight(LightsManager.LIGHT_ID_BACKLIGHT), 426 new ColorFade(Display.DEFAULT_DISPLAY)); 427 428 mColorFadeOnAnimator = ObjectAnimator.ofFloat( 429 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 0.0f, 1.0f); 430 mColorFadeOnAnimator.setDuration(COLOR_FADE_ON_ANIMATION_DURATION_MILLIS); 431 mColorFadeOnAnimator.addListener(mAnimatorListener); 432 433 mColorFadeOffAnimator = ObjectAnimator.ofFloat( 434 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 1.0f, 0.0f); 435 mColorFadeOffAnimator.setDuration(COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS); 436 mColorFadeOffAnimator.addListener(mAnimatorListener); 437 438 mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>( 439 mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS); 440 mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener); 441 442 // Initialize screen state for battery stats. 443 try { 444 mBatteryStats.noteScreenState(mPowerState.getScreenState()); 445 mBatteryStats.noteScreenBrightness(mPowerState.getScreenBrightness()); 446 } catch (RemoteException ex) { 447 // same process 448 } 449 } 450 451 private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() { 452 @Override 453 public void onAnimationStart(Animator animation) { 454 } 455 @Override 456 public void onAnimationEnd(Animator animation) { 457 sendUpdatePowerState(); 458 } 459 @Override 460 public void onAnimationRepeat(Animator animation) { 461 } 462 @Override 463 public void onAnimationCancel(Animator animation) { 464 } 465 }; 466 467 private final RampAnimator.Listener mRampAnimatorListener = new RampAnimator.Listener() { 468 @Override 469 public void onAnimationEnd() { 470 sendUpdatePowerState(); 471 } 472 }; 473 474 private void updatePowerState() { 475 // Update the power state request. 476 final boolean mustNotify; 477 boolean mustInitialize = false; 478 boolean autoBrightnessAdjustmentChanged = false; 479 480 synchronized (mLock) { 481 mPendingUpdatePowerStateLocked = false; 482 if (mPendingRequestLocked == null) { 483 return; // wait until first actual power request 484 } 485 486 if (mPowerRequest == null) { 487 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked); 488 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked; 489 mPendingWaitForNegativeProximityLocked = false; 490 mPendingRequestChangedLocked = false; 491 mustInitialize = true; 492 } else if (mPendingRequestChangedLocked) { 493 autoBrightnessAdjustmentChanged = (mPowerRequest.screenAutoBrightnessAdjustment 494 != mPendingRequestLocked.screenAutoBrightnessAdjustment); 495 mPowerRequest.copyFrom(mPendingRequestLocked); 496 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked; 497 mPendingWaitForNegativeProximityLocked = false; 498 mPendingRequestChangedLocked = false; 499 mDisplayReadyLocked = false; 500 } 501 502 mustNotify = !mDisplayReadyLocked; 503 } 504 505 // Initialize things the first time the power state is changed. 506 if (mustInitialize) { 507 initialize(); 508 } 509 510 // Compute the basic display state using the policy. 511 // We might override this below based on other factors. 512 int state; 513 int brightness = PowerManager.BRIGHTNESS_DEFAULT; 514 boolean performScreenOffTransition = false; 515 switch (mPowerRequest.policy) { 516 case DisplayPowerRequest.POLICY_OFF: 517 state = Display.STATE_OFF; 518 performScreenOffTransition = true; 519 break; 520 case DisplayPowerRequest.POLICY_DOZE: 521 if (mPowerRequest.dozeScreenState != Display.STATE_UNKNOWN) { 522 state = mPowerRequest.dozeScreenState; 523 } else { 524 state = Display.STATE_DOZE; 525 } 526 brightness = mPowerRequest.dozeScreenBrightness; 527 break; 528 case DisplayPowerRequest.POLICY_DIM: 529 case DisplayPowerRequest.POLICY_BRIGHT: 530 default: 531 state = Display.STATE_ON; 532 break; 533 } 534 assert(state != Display.STATE_UNKNOWN); 535 536 // Apply the proximity sensor. 537 if (mProximitySensor != null) { 538 if (mPowerRequest.useProximitySensor && state != Display.STATE_OFF) { 539 setProximitySensorEnabled(true); 540 if (!mScreenOffBecauseOfProximity 541 && mProximity == PROXIMITY_POSITIVE) { 542 mScreenOffBecauseOfProximity = true; 543 sendOnProximityPositiveWithWakelock(); 544 } 545 } else if (mWaitingForNegativeProximity 546 && mScreenOffBecauseOfProximity 547 && mProximity == PROXIMITY_POSITIVE 548 && state != Display.STATE_OFF) { 549 setProximitySensorEnabled(true); 550 } else { 551 setProximitySensorEnabled(false); 552 mWaitingForNegativeProximity = false; 553 } 554 if (mScreenOffBecauseOfProximity 555 && mProximity != PROXIMITY_POSITIVE) { 556 mScreenOffBecauseOfProximity = false; 557 sendOnProximityNegativeWithWakelock(); 558 } 559 } else { 560 mWaitingForNegativeProximity = false; 561 } 562 if (mScreenOffBecauseOfProximity) { 563 state = Display.STATE_OFF; 564 } 565 566 // Animate the screen state change unless already animating. 567 // The transition may be deferred, so after this point we will use the 568 // actual state instead of the desired one. 569 animateScreenStateChange(state, performScreenOffTransition); 570 state = mPowerState.getScreenState(); 571 572 // Use zero brightness when screen is off. 573 if (state == Display.STATE_OFF) { 574 brightness = PowerManager.BRIGHTNESS_OFF; 575 } 576 577 // Use default brightness when dozing unless overridden. 578 if (brightness < 0 && (state == Display.STATE_DOZE 579 || state == Display.STATE_DOZE_SUSPEND)) { 580 brightness = mScreenBrightnessDozeConfig; 581 } 582 583 // Configure auto-brightness. 584 boolean autoBrightnessEnabled = false; 585 if (mAutomaticBrightnessController != null) { 586 autoBrightnessEnabled = mPowerRequest.useAutoBrightness 587 && state == Display.STATE_ON && brightness < 0; 588 mAutomaticBrightnessController.configure(autoBrightnessEnabled, 589 mPowerRequest.screenAutoBrightnessAdjustment); 590 } 591 592 // Apply auto-brightness. 593 boolean slowChange = false; 594 if (brightness < 0) { 595 if (autoBrightnessEnabled) { 596 brightness = mAutomaticBrightnessController.getAutomaticScreenBrightness(); 597 } 598 if (brightness >= 0) { 599 // Use current auto-brightness value and slowly adjust to changes. 600 brightness = clampScreenBrightness(brightness); 601 if (mAppliedAutoBrightness && !autoBrightnessAdjustmentChanged) { 602 slowChange = true; // slowly adapt to auto-brightness 603 } 604 mAppliedAutoBrightness = true; 605 } else { 606 mAppliedAutoBrightness = false; 607 } 608 } else { 609 mAppliedAutoBrightness = false; 610 } 611 612 // Apply manual brightness. 613 // Use the current brightness setting from the request, which is expected 614 // provide a nominal default value for the case where auto-brightness 615 // is not ready yet. 616 if (brightness < 0) { 617 brightness = clampScreenBrightness(mPowerRequest.screenBrightness); 618 } 619 620 // Apply dimming by at least some minimum amount when user activity 621 // timeout is about to expire. 622 if (mPowerRequest.policy == DisplayPowerRequest.POLICY_DIM) { 623 if (brightness > mScreenBrightnessRangeMinimum) { 624 brightness = Math.max(Math.min(brightness - SCREEN_DIM_MINIMUM_REDUCTION, 625 mScreenBrightnessDimConfig), mScreenBrightnessRangeMinimum); 626 } 627 if (!mAppliedDimming) { 628 slowChange = false; 629 } 630 mAppliedDimming = true; 631 } 632 633 // If low power mode is enabled, cut the brightness level by half 634 // as long as it is above the minimum threshold. 635 if (mPowerRequest.lowPowerMode) { 636 if (brightness > mScreenBrightnessRangeMinimum) { 637 brightness = Math.max(brightness / 2, mScreenBrightnessRangeMinimum); 638 } 639 if (!mAppliedLowPower) { 640 slowChange = false; 641 } 642 mAppliedLowPower = true; 643 } 644 645 // Animate the screen brightness when the screen is on or dozing. 646 // Skip the animation when the screen is off or suspended. 647 if (state == Display.STATE_ON || state == Display.STATE_DOZE) { 648 animateScreenBrightness(brightness, 649 slowChange ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST); 650 } else { 651 animateScreenBrightness(brightness, 0); 652 } 653 654 // Determine whether the display is ready for use in the newly requested state. 655 // Note that we do not wait for the brightness ramp animation to complete before 656 // reporting the display is ready because we only need to ensure the screen is in the 657 // right power state even as it continues to converge on the desired brightness. 658 final boolean ready = mPendingScreenOnUnblocker == null 659 && !mColorFadeOnAnimator.isStarted() 660 && !mColorFadeOffAnimator.isStarted() 661 && mPowerState.waitUntilClean(mCleanListener); 662 final boolean finished = ready 663 && !mScreenBrightnessRampAnimator.isAnimating(); 664 665 // Grab a wake lock if we have unfinished business. 666 if (!finished && !mUnfinishedBusiness) { 667 if (DEBUG) { 668 Slog.d(TAG, "Unfinished business..."); 669 } 670 mCallbacks.acquireSuspendBlocker(); 671 mUnfinishedBusiness = true; 672 } 673 674 // Notify the power manager when ready. 675 if (ready && mustNotify) { 676 // Send state change. 677 synchronized (mLock) { 678 if (!mPendingRequestChangedLocked) { 679 mDisplayReadyLocked = true; 680 681 if (DEBUG) { 682 Slog.d(TAG, "Display ready!"); 683 } 684 } 685 } 686 sendOnStateChangedWithWakelock(); 687 } 688 689 // Release the wake lock when we have no unfinished business. 690 if (finished && mUnfinishedBusiness) { 691 if (DEBUG) { 692 Slog.d(TAG, "Finished business..."); 693 } 694 mUnfinishedBusiness = false; 695 mCallbacks.releaseSuspendBlocker(); 696 } 697 } 698 699 @Override 700 public void updateBrightness() { 701 sendUpdatePowerState(); 702 } 703 704 private void blockScreenOn() { 705 if (mPendingScreenOnUnblocker == null) { 706 Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 707 mPendingScreenOnUnblocker = new ScreenOnUnblocker(); 708 mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime(); 709 Slog.i(TAG, "Blocking screen on until initial contents have been drawn."); 710 } 711 } 712 713 private void unblockScreenOn() { 714 if (mPendingScreenOnUnblocker != null) { 715 mPendingScreenOnUnblocker = null; 716 long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime; 717 Slog.i(TAG, "Unblocked screen on after " + delay + " ms"); 718 Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 719 } 720 } 721 722 private boolean setScreenState(int state) { 723 if (mPowerState.getScreenState() != state) { 724 final boolean wasOn = (mPowerState.getScreenState() != Display.STATE_OFF); 725 mPowerState.setScreenState(state); 726 727 // Tell battery stats about the transition. 728 try { 729 mBatteryStats.noteScreenState(state); 730 } catch (RemoteException ex) { 731 // same process 732 } 733 734 // Tell the window manager what's happening. 735 // Temporarily block turning the screen on until the window manager is ready 736 // by leaving a black surface covering the screen. This surface is essentially 737 // the final state of the color fade animation. 738 boolean isOn = (state != Display.STATE_OFF); 739 if (wasOn && !isOn) { 740 unblockScreenOn(); 741 mWindowManagerPolicy.screenTurnedOff(); 742 } else if (!wasOn && isOn) { 743 if (mPowerState.getColorFadeLevel() == 0.0f) { 744 blockScreenOn(); 745 } else { 746 unblockScreenOn(); 747 } 748 mWindowManagerPolicy.screenTurningOn(mPendingScreenOnUnblocker); 749 } 750 } 751 return mPendingScreenOnUnblocker == null; 752 } 753 754 private int clampScreenBrightness(int value) { 755 return MathUtils.constrain( 756 value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 757 } 758 759 private void animateScreenBrightness(int target, int rate) { 760 if (DEBUG) { 761 Slog.d(TAG, "Animating brightness: target=" + target +", rate=" + rate); 762 } 763 if (mScreenBrightnessRampAnimator.animateTo(target, rate)) { 764 try { 765 mBatteryStats.noteScreenBrightness(target); 766 } catch (RemoteException ex) { 767 // same process 768 } 769 } 770 } 771 772 private void animateScreenStateChange(int target, boolean performScreenOffTransition) { 773 // If there is already an animation in progress, don't interfere with it. 774 if (mColorFadeOnAnimator.isStarted() 775 || mColorFadeOffAnimator.isStarted()) { 776 return; 777 } 778 779 // If we were in the process of turning off the screen but didn't quite 780 // finish. Then finish up now to prevent a jarring transition back 781 // to screen on if we skipped blocking screen on as usual. 782 if (mPendingScreenOff && target != Display.STATE_OFF) { 783 setScreenState(Display.STATE_OFF); 784 mPendingScreenOff = false; 785 } 786 787 if (target == Display.STATE_ON) { 788 // Want screen on. The contents of the screen may not yet 789 // be visible if the color fade has not been dismissed because 790 // its last frame of animation is solid black. 791 if (!setScreenState(Display.STATE_ON)) { 792 return; // screen on blocked 793 } 794 if (USE_COLOR_FADE_ON_ANIMATION && mPowerRequest.isBrightOrDim()) { 795 // Perform screen on animation. 796 if (mPowerState.getColorFadeLevel() == 1.0f) { 797 mPowerState.dismissColorFade(); 798 } else if (mPowerState.prepareColorFade(mContext, 799 mColorFadeFadesConfig ? 800 ColorFade.MODE_FADE : 801 ColorFade.MODE_WARM_UP)) { 802 mColorFadeOnAnimator.start(); 803 } else { 804 mColorFadeOnAnimator.end(); 805 } 806 } else { 807 // Skip screen on animation. 808 mPowerState.setColorFadeLevel(1.0f); 809 mPowerState.dismissColorFade(); 810 } 811 } else if (target == Display.STATE_DOZE) { 812 // Want screen dozing. 813 // Wait for brightness animation to complete beforehand when entering doze 814 // from screen on to prevent a perceptible jump because brightness may operate 815 // differently when the display is configured for dozing. 816 if (mScreenBrightnessRampAnimator.isAnimating() 817 && mPowerState.getScreenState() == Display.STATE_ON) { 818 return; 819 } 820 821 // Set screen state. 822 if (!setScreenState(Display.STATE_DOZE)) { 823 return; // screen on blocked 824 } 825 826 // Dismiss the black surface without fanfare. 827 mPowerState.setColorFadeLevel(1.0f); 828 mPowerState.dismissColorFade(); 829 } else if (target == Display.STATE_DOZE_SUSPEND) { 830 // Want screen dozing and suspended. 831 // Wait for brightness animation to complete beforehand unless already 832 // suspended because we may not be able to change it after suspension. 833 if (mScreenBrightnessRampAnimator.isAnimating() 834 && mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) { 835 return; 836 } 837 838 // If not already suspending, temporarily set the state to doze until the 839 // screen on is unblocked, then suspend. 840 if (mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) { 841 if (!setScreenState(Display.STATE_DOZE)) { 842 return; // screen on blocked 843 } 844 setScreenState(Display.STATE_DOZE_SUSPEND); // already on so can't block 845 } 846 847 // Dismiss the black surface without fanfare. 848 mPowerState.setColorFadeLevel(1.0f); 849 mPowerState.dismissColorFade(); 850 } else { 851 // Want screen off. 852 mPendingScreenOff = true; 853 if (mPowerState.getColorFadeLevel() == 0.0f) { 854 // Turn the screen off. 855 // A black surface is already hiding the contents of the screen. 856 setScreenState(Display.STATE_OFF); 857 mPendingScreenOff = false; 858 } else if (performScreenOffTransition 859 && mPowerState.prepareColorFade(mContext, 860 mColorFadeFadesConfig ? 861 ColorFade.MODE_FADE : ColorFade.MODE_COOL_DOWN) 862 && mPowerState.getScreenState() != Display.STATE_OFF) { 863 // Perform the screen off animation. 864 mColorFadeOffAnimator.start(); 865 } else { 866 // Skip the screen off animation and add a black surface to hide the 867 // contents of the screen. 868 mColorFadeOffAnimator.end(); 869 } 870 } 871 } 872 873 private final Runnable mCleanListener = new Runnable() { 874 @Override 875 public void run() { 876 sendUpdatePowerState(); 877 } 878 }; 879 880 private void setProximitySensorEnabled(boolean enable) { 881 if (enable) { 882 if (!mProximitySensorEnabled) { 883 // Register the listener. 884 // Proximity sensor state already cleared initially. 885 mProximitySensorEnabled = true; 886 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor, 887 SensorManager.SENSOR_DELAY_NORMAL, mHandler); 888 } 889 } else { 890 if (mProximitySensorEnabled) { 891 // Unregister the listener. 892 // Clear the proximity sensor state for next time. 893 mProximitySensorEnabled = false; 894 mProximity = PROXIMITY_UNKNOWN; 895 mPendingProximity = PROXIMITY_UNKNOWN; 896 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 897 mSensorManager.unregisterListener(mProximitySensorListener); 898 clearPendingProximityDebounceTime(); // release wake lock (must be last) 899 } 900 } 901 } 902 903 private void handleProximitySensorEvent(long time, boolean positive) { 904 if (mProximitySensorEnabled) { 905 if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) { 906 return; // no change 907 } 908 if (mPendingProximity == PROXIMITY_POSITIVE && positive) { 909 return; // no change 910 } 911 912 // Only accept a proximity sensor reading if it remains 913 // stable for the entire debounce delay. We hold a wake lock while 914 // debouncing the sensor. 915 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 916 if (positive) { 917 mPendingProximity = PROXIMITY_POSITIVE; 918 setPendingProximityDebounceTime( 919 time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock 920 } else { 921 mPendingProximity = PROXIMITY_NEGATIVE; 922 setPendingProximityDebounceTime( 923 time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock 924 } 925 926 // Debounce the new sensor reading. 927 debounceProximitySensor(); 928 } 929 } 930 931 private void debounceProximitySensor() { 932 if (mProximitySensorEnabled 933 && mPendingProximity != PROXIMITY_UNKNOWN 934 && mPendingProximityDebounceTime >= 0) { 935 final long now = SystemClock.uptimeMillis(); 936 if (mPendingProximityDebounceTime <= now) { 937 // Sensor reading accepted. Apply the change then release the wake lock. 938 mProximity = mPendingProximity; 939 updatePowerState(); 940 clearPendingProximityDebounceTime(); // release wake lock (must be last) 941 } else { 942 // Need to wait a little longer. 943 // Debounce again later. We continue holding a wake lock while waiting. 944 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED); 945 msg.setAsynchronous(true); 946 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime); 947 } 948 } 949 } 950 951 private void clearPendingProximityDebounceTime() { 952 if (mPendingProximityDebounceTime >= 0) { 953 mPendingProximityDebounceTime = -1; 954 mCallbacks.releaseSuspendBlocker(); // release wake lock 955 } 956 } 957 958 private void setPendingProximityDebounceTime(long debounceTime) { 959 if (mPendingProximityDebounceTime < 0) { 960 mCallbacks.acquireSuspendBlocker(); // acquire wake lock 961 } 962 mPendingProximityDebounceTime = debounceTime; 963 } 964 965 private void sendOnStateChangedWithWakelock() { 966 mCallbacks.acquireSuspendBlocker(); 967 mHandler.post(mOnStateChangedRunnable); 968 } 969 970 private final Runnable mOnStateChangedRunnable = new Runnable() { 971 @Override 972 public void run() { 973 mCallbacks.onStateChanged(); 974 mCallbacks.releaseSuspendBlocker(); 975 } 976 }; 977 978 private void sendOnProximityPositiveWithWakelock() { 979 mCallbacks.acquireSuspendBlocker(); 980 mHandler.post(mOnProximityPositiveRunnable); 981 } 982 983 private final Runnable mOnProximityPositiveRunnable = new Runnable() { 984 @Override 985 public void run() { 986 mCallbacks.onProximityPositive(); 987 mCallbacks.releaseSuspendBlocker(); 988 } 989 }; 990 991 private void sendOnProximityNegativeWithWakelock() { 992 mCallbacks.acquireSuspendBlocker(); 993 mHandler.post(mOnProximityNegativeRunnable); 994 } 995 996 private final Runnable mOnProximityNegativeRunnable = new Runnable() { 997 @Override 998 public void run() { 999 mCallbacks.onProximityNegative(); 1000 mCallbacks.releaseSuspendBlocker(); 1001 } 1002 }; 1003 1004 public void dump(final PrintWriter pw) { 1005 synchronized (mLock) { 1006 pw.println(); 1007 pw.println("Display Power Controller Locked State:"); 1008 pw.println(" mDisplayReadyLocked=" + mDisplayReadyLocked); 1009 pw.println(" mPendingRequestLocked=" + mPendingRequestLocked); 1010 pw.println(" mPendingRequestChangedLocked=" + mPendingRequestChangedLocked); 1011 pw.println(" mPendingWaitForNegativeProximityLocked=" 1012 + mPendingWaitForNegativeProximityLocked); 1013 pw.println(" mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked); 1014 } 1015 1016 pw.println(); 1017 pw.println("Display Power Controller Configuration:"); 1018 pw.println(" mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig); 1019 pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig); 1020 pw.println(" mScreenBrightnessDarkConfig=" + mScreenBrightnessDarkConfig); 1021 pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 1022 pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 1023 pw.println(" mUseSoftwareAutoBrightnessConfig=" + mUseSoftwareAutoBrightnessConfig); 1024 pw.println(" mColorFadeFadesConfig=" + mColorFadeFadesConfig); 1025 1026 mHandler.runWithScissors(new Runnable() { 1027 @Override 1028 public void run() { 1029 dumpLocal(pw); 1030 } 1031 }, 1000); 1032 } 1033 1034 private void dumpLocal(PrintWriter pw) { 1035 pw.println(); 1036 pw.println("Display Power Controller Thread State:"); 1037 pw.println(" mPowerRequest=" + mPowerRequest); 1038 pw.println(" mWaitingForNegativeProximity=" + mWaitingForNegativeProximity); 1039 1040 pw.println(" mProximitySensor=" + mProximitySensor); 1041 pw.println(" mProximitySensorEnabled=" + mProximitySensorEnabled); 1042 pw.println(" mProximityThreshold=" + mProximityThreshold); 1043 pw.println(" mProximity=" + proximityToString(mProximity)); 1044 pw.println(" mPendingProximity=" + proximityToString(mPendingProximity)); 1045 pw.println(" mPendingProximityDebounceTime=" 1046 + TimeUtils.formatUptime(mPendingProximityDebounceTime)); 1047 pw.println(" mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity); 1048 pw.println(" mAppliedAutoBrightness=" + mAppliedAutoBrightness); 1049 pw.println(" mAppliedDimming=" + mAppliedDimming); 1050 pw.println(" mAppliedLowPower=" + mAppliedLowPower); 1051 pw.println(" mPendingScreenOnUnblocker=" + mPendingScreenOnUnblocker); 1052 pw.println(" mPendingScreenOff=" + mPendingScreenOff); 1053 1054 pw.println(" mScreenBrightnessRampAnimator.isAnimating()=" + 1055 mScreenBrightnessRampAnimator.isAnimating()); 1056 1057 if (mColorFadeOnAnimator != null) { 1058 pw.println(" mColorFadeOnAnimator.isStarted()=" + 1059 mColorFadeOnAnimator.isStarted()); 1060 } 1061 if (mColorFadeOffAnimator != null) { 1062 pw.println(" mColorFadeOffAnimator.isStarted()=" + 1063 mColorFadeOffAnimator.isStarted()); 1064 } 1065 1066 if (mPowerState != null) { 1067 mPowerState.dump(pw); 1068 } 1069 1070 if (mAutomaticBrightnessController != null) { 1071 mAutomaticBrightnessController.dump(pw); 1072 } 1073 1074 } 1075 1076 private static String proximityToString(int state) { 1077 switch (state) { 1078 case PROXIMITY_UNKNOWN: 1079 return "Unknown"; 1080 case PROXIMITY_NEGATIVE: 1081 return "Negative"; 1082 case PROXIMITY_POSITIVE: 1083 return "Positive"; 1084 default: 1085 return Integer.toString(state); 1086 } 1087 } 1088 1089 private static Spline createAutoBrightnessSpline(int[] lux, int[] brightness) { 1090 try { 1091 final int n = brightness.length; 1092 float[] x = new float[n]; 1093 float[] y = new float[n]; 1094 y[0] = normalizeAbsoluteBrightness(brightness[0]); 1095 for (int i = 1; i < n; i++) { 1096 x[i] = lux[i - 1]; 1097 y[i] = normalizeAbsoluteBrightness(brightness[i]); 1098 } 1099 1100 Spline spline = Spline.createSpline(x, y); 1101 if (DEBUG) { 1102 Slog.d(TAG, "Auto-brightness spline: " + spline); 1103 for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) { 1104 Slog.d(TAG, String.format(" %7.1f: %7.1f", v, spline.interpolate(v))); 1105 } 1106 } 1107 return spline; 1108 } catch (IllegalArgumentException ex) { 1109 Slog.e(TAG, "Could not create auto-brightness spline.", ex); 1110 return null; 1111 } 1112 } 1113 1114 private static float normalizeAbsoluteBrightness(int value) { 1115 return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON; 1116 } 1117 1118 private static int clampAbsoluteBrightness(int value) { 1119 return MathUtils.constrain(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON); 1120 } 1121 1122 private final class DisplayControllerHandler extends Handler { 1123 public DisplayControllerHandler(Looper looper) { 1124 super(looper, null, true /*async*/); 1125 } 1126 1127 @Override 1128 public void handleMessage(Message msg) { 1129 switch (msg.what) { 1130 case MSG_UPDATE_POWER_STATE: 1131 updatePowerState(); 1132 break; 1133 1134 case MSG_PROXIMITY_SENSOR_DEBOUNCED: 1135 debounceProximitySensor(); 1136 break; 1137 1138 case MSG_SCREEN_ON_UNBLOCKED: 1139 if (mPendingScreenOnUnblocker == msg.obj) { 1140 unblockScreenOn(); 1141 updatePowerState(); 1142 } 1143 break; 1144 } 1145 } 1146 } 1147 1148 private final SensorEventListener mProximitySensorListener = new SensorEventListener() { 1149 @Override 1150 public void onSensorChanged(SensorEvent event) { 1151 if (mProximitySensorEnabled) { 1152 final long time = SystemClock.uptimeMillis(); 1153 final float distance = event.values[0]; 1154 boolean positive = distance >= 0.0f && distance < mProximityThreshold; 1155 handleProximitySensorEvent(time, positive); 1156 } 1157 } 1158 1159 @Override 1160 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1161 // Not used. 1162 } 1163 }; 1164 1165 private final class ScreenOnUnblocker implements WindowManagerPolicy.ScreenOnListener { 1166 @Override 1167 public void onScreenOn() { 1168 Message msg = mHandler.obtainMessage(MSG_SCREEN_ON_UNBLOCKED, this); 1169 msg.setAsynchronous(true); 1170 mHandler.sendMessage(msg); 1171 } 1172 } 1173} 1174