AutomaticBrightnessController.java revision 57d6f11d6ab5d409f3291923ea34f9be709925bc
1639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright/* 2639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * Copyright (C) 2014 The Android Open Source Project 3639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * 4639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * Licensed under the Apache License, Version 2.0 (the "License"); 5639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * you may not use this file except in compliance with the License. 6639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * You may obtain a copy of the License at 7639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * 8639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * http://www.apache.org/licenses/LICENSE-2.0 9639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * 10639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * Unless required by applicable law or agreed to in writing, software 11639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * distributed under the License is distributed on an "AS IS" BASIS, 12639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * See the License for the specific language governing permissions and 14639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright * limitations under the License. 15639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright */ 16639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 17131206b8a9d07400d7c98aea50cc45c38769448fJeff Brownpackage com.android.server.display; 18639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 19a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brownimport com.android.server.EventLogTags; 20131206b8a9d07400d7c98aea50cc45c38769448fJeff Brownimport com.android.server.LocalServices; 21639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 22908b86c796443ba4ec55c669e8a0297fc80574a6Justin Klaassenimport android.annotation.Nullable; 23639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.Sensor; 24639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorEvent; 25639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorEventListener; 26639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorManager; 27eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wrightimport android.hardware.display.BrightnessConfiguration; 28d846023804ddadcd692666152db420c54594ddb9Michael Wrightimport android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 29639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Handler; 30639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Looper; 31639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Message; 32639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.PowerManager; 33639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.SystemClock; 34b0a1d3d08fc459e0d9937e299e16de17d1388ac4Michael Wrightimport android.os.Trace; 35639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.text.format.DateUtils; 36a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brownimport android.util.EventLog; 37639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.MathUtils; 38639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.Slog; 39639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.TimeUtils; 40639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 41639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport java.io.PrintWriter; 42639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 43639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightclass AutomaticBrightnessController { 44639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final String TAG = "AutomaticBrightnessController"; 45639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 46639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final boolean DEBUG = false; 47639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final boolean DEBUG_PRETEND_LIGHT_SENSOR_ABSENT = false; 48639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 49639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If true, enables the use of the screen auto-brightness adjustment setting. 50daf7d410fc97647f2b3ab4254f73c09c923018deAdrian Roos private static final boolean USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT = true; 51639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 52639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // How long the current sensor reading is assumed to be valid beyond the current time. 53639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // This provides a bit of prediction, as well as ensures that the weight for the last sample is 54639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // non-zero, which in turn ensures that the total weight is non-zero. 55639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final long AMBIENT_LIGHT_PREDICTION_TIME_MILLIS = 100; 56639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 57a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // Debounce for sampling user-initiated changes in display brightness to ensure 58a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // the user is satisfied with the result before storing the sample. 59a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private static final int BRIGHTNESS_ADJUSTMENT_SAMPLE_DEBOUNCE_MILLIS = 10000; 60a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 61d846023804ddadcd692666152db420c54594ddb9Michael Wright // Timeout after which we remove the effects any user interactions might've had on the 62d846023804ddadcd692666152db420c54594ddb9Michael Wright // brightness mapping. This timeout doesn't start until we transition to a non-interactive 63d846023804ddadcd692666152db420c54594ddb9Michael Wright // display policy so that we don't reset while users are using their devices, but also so that 64d846023804ddadcd692666152db420c54594ddb9Michael Wright // we don't erroneously keep the short-term model if the device is dozing but the display is 65d846023804ddadcd692666152db420c54594ddb9Michael Wright // fully on. 66d846023804ddadcd692666152db420c54594ddb9Michael Wright private static final int SHORT_TERM_MODEL_TIMEOUT_MILLIS = 30000; 67d846023804ddadcd692666152db420c54594ddb9Michael Wright 68639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final int MSG_UPDATE_AMBIENT_LUX = 1; 69a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private static final int MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE = 2; 70c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private static final int MSG_INVALIDATE_SHORT_TERM_MODEL = 3; 71639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 720a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Length of the ambient light horizon used to calculate the long term estimate of ambient 730a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // light. 740a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private static final int AMBIENT_LIGHT_LONG_HORIZON_MILLIS = 10000; 750a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 760a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Length of the ambient light horizon used to calculate short-term estimate of ambient light. 770a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private static final int AMBIENT_LIGHT_SHORT_HORIZON_MILLIS = 2000; 780a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 79428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza // Callbacks for requesting updates to the display's power state 80639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final Callbacks mCallbacks; 81639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 82639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The sensor manager. 83639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final SensorManager mSensorManager; 84639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 85639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The light sensor, or null if not available or needed. 86639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final Sensor mLightSensor; 87639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 88eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright // The mapper to translate ambient lux to screen brightness in the range [0, 1.0]. 89eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright private final BrightnessMappingStrategy mBrightnessMapper; 90639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 91639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The minimum and maximum screen brightnesses. 92639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final int mScreenBrightnessRangeMinimum; 93639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final int mScreenBrightnessRangeMaximum; 94a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski private final float mDozeScaleFactor; 95639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 965d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // Initial light sensor event rate in milliseconds. 975d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private final int mInitialLightSensorRate; 985d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 995d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // Steady-state light sensor event rate in milliseconds. 1005d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private final int mNormalLightSensorRate; 1015d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 1025d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // The current light sensor event rate in milliseconds. 1035d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private int mCurrentLightSensorRate; 104d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 105d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // Stability requirements in milliseconds for accepting a new brightness level. This is used 106d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // for debouncing the light sensor. Different constants are used to debounce the light sensor 107d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // when adapting to brighter or darker environments. This parameter controls how quickly 108d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // brightness changes occur in response to an observed change in light level that exceeds the 109d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // hysteresis threshold. 110d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final long mBrighteningLightDebounceConfig; 111d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final long mDarkeningLightDebounceConfig; 112d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 113d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // If true immediately after the screen is turned on the controller will try to adjust the 114d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // brightness based on the current sensor reads. If false, the controller will collect more data 115d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // and only then decide whether to change brightness. 116d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final boolean mResetAmbientLuxAfterWarmUpConfig; 117d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 1186fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // Period of time in which to consider light samples in milliseconds. 1196fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private final int mAmbientLightHorizon; 1206fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic 1216fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // The intercept used for the weighting calculation. This is used in order to keep all possible 1226fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // weighting values positive. 1236fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private final int mWeightingIntercept; 1246fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic 125428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza // accessor object for determining thresholds to change brightness dynamically 126428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza private final HysteresisLevels mDynamicHysteresis; 127428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza 128639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Amount of time to delay auto-brightness after screen on while waiting for 129639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // the light sensor to warm-up in milliseconds. 130639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // May be 0 if no warm-up is required. 131639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mLightSensorWarmUpTimeConfig; 132639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 133639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Set to true if the light sensor is enabled. 134639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean mLightSensorEnabled; 135639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 136639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The time when the light sensor was enabled. 137639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long mLightSensorEnableTime; 138639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 139639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The currently accepted nominal ambient light level. 140639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mAmbientLux; 141639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 142639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // True if mAmbientLux holds a valid value. 143639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean mAmbientLuxValid; 144639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 145639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The ambient light level threshold at which to brighten or darken the screen. 146639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mBrighteningLuxThreshold; 147639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mDarkeningLuxThreshold; 148639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 149639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The most recent light sample. 150639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mLastObservedLux; 151639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 152639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The time of the most light recent sample. 153639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long mLastObservedLuxTime; 154639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 155639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The number of light samples collected since the light sensor was enabled. 156639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mRecentLightSamples; 157639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 158639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // A ring buffer containing all of the recent ambient light sensor readings. 159639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private AmbientLightRingBuffer mAmbientLightRingBuffer; 160639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 161639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The handler 162639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private AutomaticBrightnessHandler mHandler; 163639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 164639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The screen brightness level that has been chosen by the auto-brightness 165639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // algorithm. The actual brightness should ramp towards this value. 166639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // We preserve this value even when we stop using the light sensor so 167639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // that we can quickly revert to the previous auto-brightness level 168639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // while the light sensor warms up. 169639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Use -1 if there is no current auto-brightness value available. 170639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mScreenAutoBrightness = -1; 171639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 172d846023804ddadcd692666152db420c54594ddb9Michael Wright // The current display policy. This is useful, for example, for knowing when we're dozing, 173d846023804ddadcd692666152db420c54594ddb9Michael Wright // where the light sensor may not be available. 174d846023804ddadcd692666152db420c54594ddb9Michael Wright private int mDisplayPolicy = DisplayPowerRequest.POLICY_OFF; 175a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski 176a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // True if we are collecting a brightness adjustment sample, along with some data 177a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // for the initial state of the sample. 178a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private boolean mBrightnessAdjustmentSamplePending; 179a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private float mBrightnessAdjustmentSampleOldLux; 180a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private int mBrightnessAdjustmentSampleOldBrightness; 181a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 182c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // When the short term model is invalidated, we don't necessarily reset it (i.e. clear the 183c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // user's adjustment) immediately, but wait for a drastic enough change in the ambient light. 184c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // The anchor determines what were the light levels when the user has set her preference, and 185c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // we use a relative threshold to determine when to revert to the OEM curve. 186c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private boolean mShortTermModelValid; 187c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private float mShortTermModelAnchor; 188c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private float SHORT_TERM_MODEL_THRESHOLD_RATIO = 0.6f; 189c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 190639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public AutomaticBrightnessController(Callbacks callbacks, Looper looper, 19157d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik SensorManager sensorManager, BrightnessMappingStrategy mapper, 19257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik int lightSensorWarmUpTime, int brightnessMin, int brightnessMax, float dozeScaleFactor, 1935d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza int lightSensorRate, int initialLightSensorRate, long brighteningLightDebounceConfig, 1946fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic long darkeningLightDebounceConfig, boolean resetAmbientLuxAfterWarmUpConfig, 19557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik int ambientLightHorizon, HysteresisLevels dynamicHysteresis) { 196639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCallbacks = callbacks; 197639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mSensorManager = sensorManager; 198eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright mBrightnessMapper = mapper; 199639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMinimum = brightnessMin; 200639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMaximum = brightnessMax; 201639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorWarmUpTimeConfig = lightSensorWarmUpTime; 202a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski mDozeScaleFactor = dozeScaleFactor; 2035d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mNormalLightSensorRate = lightSensorRate; 2045d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mInitialLightSensorRate = initialLightSensorRate; 2055d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = -1; 206d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mBrighteningLightDebounceConfig = brighteningLightDebounceConfig; 207d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mDarkeningLightDebounceConfig = darkeningLightDebounceConfig; 208d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mResetAmbientLuxAfterWarmUpConfig = resetAmbientLuxAfterWarmUpConfig; 2096fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mAmbientLightHorizon = ambientLightHorizon; 2106fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mWeightingIntercept = ambientLightHorizon; 211428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza mDynamicHysteresis = dynamicHysteresis; 212c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 213c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = -1; 214639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 215639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler = new AutomaticBrightnessHandler(looper); 216103fb78ac1b91874f8b90cc5a165e6f0502179c4Michael Wright mAmbientLightRingBuffer = 2175d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza new AmbientLightRingBuffer(mNormalLightSensorRate, mAmbientLightHorizon); 218639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 219639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!DEBUG_PRETEND_LIGHT_SENSOR_ABSENT) { 220639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); 221639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 222639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 223639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 224639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public int getAutomaticScreenBrightness() { 225d846023804ddadcd692666152db420c54594ddb9Michael Wright if (mDisplayPolicy == DisplayPowerRequest.POLICY_DOZE) { 226a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski return (int) (mScreenAutoBrightness * mDozeScaleFactor); 227a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski } 228639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mScreenAutoBrightness; 229639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 230639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 231617564ff2cdee2e9a50339544129283503ae71a8Michael Wright public float getAutomaticScreenBrightnessAdjustment() { 23257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik return mBrightnessMapper.getAutoBrightnessAdjustment(); 233617564ff2cdee2e9a50339544129283503ae71a8Michael Wright } 234617564ff2cdee2e9a50339544129283503ae71a8Michael Wright 235eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright public void configure(boolean enable, @Nullable BrightnessConfiguration configuration, 236617564ff2cdee2e9a50339544129283503ae71a8Michael Wright float brightness, boolean userChangedBrightness, float adjustment, 237617564ff2cdee2e9a50339544129283503ae71a8Michael Wright boolean userChangedAutoBrightnessAdjustment, int displayPolicy) { 238a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // While dozing, the application processor may be suspended which will prevent us from 239a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // receiving new information from the light sensor. On some devices, we may be able to 240a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // switch to a wake-up light sensor instead but for now we will simply disable the sensor 241a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // and hold onto the last computed screen auto brightness. We save the dozing flag for 242a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // debugging purposes. 243d846023804ddadcd692666152db420c54594ddb9Michael Wright boolean dozing = (displayPolicy == DisplayPowerRequest.POLICY_DOZE); 244eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright boolean changed = setBrightnessConfiguration(configuration); 245d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setDisplayPolicy(displayPolicy); 24657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik if (userChangedAutoBrightnessAdjustment) { 24757d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik changed |= setAutoBrightnessAdjustment(adjustment); 24857d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik } 249617564ff2cdee2e9a50339544129283503ae71a8Michael Wright if (userChangedBrightness && enable) { 250617564ff2cdee2e9a50339544129283503ae71a8Michael Wright // Update the brightness curve with the new user control point. It's critical this 251617564ff2cdee2e9a50339544129283503ae71a8Michael Wright // happens after we update the autobrightness adjustment since it may reset it. 252d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setScreenBrightnessByUser(brightness); 253617564ff2cdee2e9a50339544129283503ae71a8Michael Wright } 254617564ff2cdee2e9a50339544129283503ae71a8Michael Wright final boolean userInitiatedChange = 255617564ff2cdee2e9a50339544129283503ae71a8Michael Wright userChangedBrightness || userChangedAutoBrightnessAdjustment; 256617564ff2cdee2e9a50339544129283503ae71a8Michael Wright if (userInitiatedChange && enable && !dozing) { 257a8edffd804d3940dec1fa5c9777d10beccb2f6a6Soroosh Mariooryad prepareBrightnessAdjustmentSample(); 258a8edffd804d3940dec1fa5c9777d10beccb2f6a6Soroosh Mariooryad } 259d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setLightSensorEnabled(enable && !dozing); 260970d4132ea28e748c1010be39450a98bbf7466f3Jeff Brown if (changed) { 261639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(false /*sendUpdate*/); 262639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 263639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 264639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 26553d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy public boolean hasUserDataPoints() { 26653d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy return mBrightnessMapper.hasUserDataPoints(); 26753d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy } 26853d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy 26953d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy public boolean isDefaultConfig() { 27053d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy return mBrightnessMapper.isDefaultConfig(); 27153d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy } 27253d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy 2736d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy public BrightnessConfiguration getDefaultConfig() { 2746d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy return mBrightnessMapper.getDefaultConfig(); 2756d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy } 2766d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy 277d846023804ddadcd692666152db420c54594ddb9Michael Wright private boolean setDisplayPolicy(int policy) { 278d846023804ddadcd692666152db420c54594ddb9Michael Wright if (mDisplayPolicy == policy) { 279d846023804ddadcd692666152db420c54594ddb9Michael Wright return false; 280d846023804ddadcd692666152db420c54594ddb9Michael Wright } 281d846023804ddadcd692666152db420c54594ddb9Michael Wright final int oldPolicy = mDisplayPolicy; 282d846023804ddadcd692666152db420c54594ddb9Michael Wright mDisplayPolicy = policy; 283d846023804ddadcd692666152db420c54594ddb9Michael Wright if (DEBUG) { 284c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "Display policy transitioning from " + oldPolicy + " to " + policy); 285d846023804ddadcd692666152db420c54594ddb9Michael Wright } 286d846023804ddadcd692666152db420c54594ddb9Michael Wright if (!isInteractivePolicy(policy) && isInteractivePolicy(oldPolicy)) { 287c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.sendEmptyMessageDelayed(MSG_INVALIDATE_SHORT_TERM_MODEL, 288d846023804ddadcd692666152db420c54594ddb9Michael Wright SHORT_TERM_MODEL_TIMEOUT_MILLIS); 289d846023804ddadcd692666152db420c54594ddb9Michael Wright } else if (isInteractivePolicy(policy) && !isInteractivePolicy(oldPolicy)) { 290c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.removeMessages(MSG_INVALIDATE_SHORT_TERM_MODEL); 291d846023804ddadcd692666152db420c54594ddb9Michael Wright } 292d846023804ddadcd692666152db420c54594ddb9Michael Wright return true; 293d846023804ddadcd692666152db420c54594ddb9Michael Wright } 294d846023804ddadcd692666152db420c54594ddb9Michael Wright 295d846023804ddadcd692666152db420c54594ddb9Michael Wright private static boolean isInteractivePolicy(int policy) { 296d846023804ddadcd692666152db420c54594ddb9Michael Wright return policy == DisplayPowerRequest.POLICY_BRIGHT 297d846023804ddadcd692666152db420c54594ddb9Michael Wright || policy == DisplayPowerRequest.POLICY_DIM 298d846023804ddadcd692666152db420c54594ddb9Michael Wright || policy == DisplayPowerRequest.POLICY_VR; 299d846023804ddadcd692666152db420c54594ddb9Michael Wright } 300d846023804ddadcd692666152db420c54594ddb9Michael Wright 301d846023804ddadcd692666152db420c54594ddb9Michael Wright private boolean setScreenBrightnessByUser(float brightness) { 302d846023804ddadcd692666152db420c54594ddb9Michael Wright if (!mAmbientLuxValid) { 303d846023804ddadcd692666152db420c54594ddb9Michael Wright // If we don't have a valid ambient lux then we don't have a valid brightness anyways, 304d846023804ddadcd692666152db420c54594ddb9Michael Wright // and we can't use this data to add a new control point to the short-term model. 305d846023804ddadcd692666152db420c54594ddb9Michael Wright return false; 306d846023804ddadcd692666152db420c54594ddb9Michael Wright } 307d846023804ddadcd692666152db420c54594ddb9Michael Wright mBrightnessMapper.addUserDataPoint(mAmbientLux, brightness); 308c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 309c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = mAmbientLux; 310c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (DEBUG) { 311c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: anchor=" + mShortTermModelAnchor); 312c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 313d846023804ddadcd692666152db420c54594ddb9Michael Wright return true; 314d846023804ddadcd692666152db420c54594ddb9Michael Wright } 315d846023804ddadcd692666152db420c54594ddb9Michael Wright 316d846023804ddadcd692666152db420c54594ddb9Michael Wright private void resetShortTermModel() { 317d846023804ddadcd692666152db420c54594ddb9Michael Wright mBrightnessMapper.clearUserDataPoints(); 318c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 319c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = -1; 320c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 321c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 322c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private void invalidateShortTermModel() { 323c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (DEBUG) { 324c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: invalidate user data"); 325c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 326c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = false; 327d846023804ddadcd692666152db420c54594ddb9Michael Wright } 328d846023804ddadcd692666152db420c54594ddb9Michael Wright 329eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright public boolean setBrightnessConfiguration(BrightnessConfiguration configuration) { 330eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright return mBrightnessMapper.setBrightnessConfiguration(configuration); 331eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright } 332eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright 333639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void dump(PrintWriter pw) { 334639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(); 335639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println("Automatic Brightness Controller Configuration:"); 336639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 337639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 338639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorWarmUpTimeConfig=" + mLightSensorWarmUpTimeConfig); 339d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mBrighteningLightDebounceConfig=" + mBrighteningLightDebounceConfig); 340d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mDarkeningLightDebounceConfig=" + mDarkeningLightDebounceConfig); 341d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mResetAmbientLuxAfterWarmUpConfig=" + mResetAmbientLuxAfterWarmUpConfig); 342639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 343639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(); 344639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println("Automatic Brightness Controller State:"); 345639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensor=" + mLightSensor); 346639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorEnabled=" + mLightSensorEnabled); 347639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorEnableTime=" + TimeUtils.formatUptime(mLightSensorEnableTime)); 348639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mAmbientLux=" + mAmbientLux); 3496fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic pw.println(" mAmbientLightHorizon=" + mAmbientLightHorizon); 350639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mBrighteningLuxThreshold=" + mBrighteningLuxThreshold); 351639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mDarkeningLuxThreshold=" + mDarkeningLuxThreshold); 352639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLastObservedLux=" + mLastObservedLux); 353639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLastObservedLuxTime=" + TimeUtils.formatUptime(mLastObservedLuxTime)); 354639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mRecentLightSamples=" + mRecentLightSamples); 355639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mAmbientLightRingBuffer=" + mAmbientLightRingBuffer); 356639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenAutoBrightness=" + mScreenAutoBrightness); 357d846023804ddadcd692666152db420c54594ddb9Michael Wright pw.println(" mDisplayPolicy=" + mDisplayPolicy); 358c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik pw.println(" mShortTermModelAnchor=" + mShortTermModelAnchor); 359eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright 360eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright pw.println(); 361eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright mBrightnessMapper.dump(pw); 362639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 363639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 364639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean setLightSensorEnabled(boolean enable) { 365639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (enable) { 366639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mLightSensorEnabled) { 367639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorEnabled = true; 368639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorEnableTime = SystemClock.uptimeMillis(); 3695d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = mInitialLightSensorRate; 370639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mSensorManager.registerListener(mLightSensorListener, mLightSensor, 3715d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate * 1000, mHandler); 372639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return true; 373639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 374c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } else if (mLightSensorEnabled) { 375c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mLightSensorEnabled = false; 376c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mAmbientLuxValid = !mResetAmbientLuxAfterWarmUpConfig; 377c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mRecentLightSamples = 0; 378c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mAmbientLightRingBuffer.clear(); 379c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mCurrentLightSensorRate = -1; 380c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.removeMessages(MSG_UPDATE_AMBIENT_LUX); 381c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mSensorManager.unregisterListener(mLightSensorListener); 382639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 383639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return false; 384639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 385639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 386639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void handleLightSensorEvent(long time, float lux) { 387b0a1d3d08fc459e0d9937e299e16de17d1388ac4Michael Wright Trace.traceCounter(Trace.TRACE_TAG_POWER, "ALS", (int) lux); 388639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.removeMessages(MSG_UPDATE_AMBIENT_LUX); 389639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 3905d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (mAmbientLightRingBuffer.size() == 0) { 3915d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // switch to using the steady-state sample rate after grabbing the initial light sample 3925d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza adjustLightSensorRate(mNormalLightSensorRate); 3935d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 394639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright applyLightSensorMeasurement(time, lux); 395639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(time); 396639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 397639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 398639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void applyLightSensorMeasurement(long time, float lux) { 399639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRecentLightSamples++; 4006fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon); 401639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLightRingBuffer.push(time, lux); 402639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 403639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Remember this sample value. 404639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLastObservedLux = lux; 405639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLastObservedLuxTime = time; 406639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 407639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 4085d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private void adjustLightSensorRate(int lightSensorRate) { 4095d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // if the light sensor rate changed, update the sensor listener 4105d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (lightSensorRate != mCurrentLightSensorRate) { 4115d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (DEBUG) { 412c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "adjustLightSensorRate: " + 41357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "previousRate=" + mCurrentLightSensorRate + ", " + 41457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "currentRate=" + lightSensorRate); 4155d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4165d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = lightSensorRate; 4175d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mSensorManager.unregisterListener(mLightSensorListener); 4185d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mSensorManager.registerListener(mLightSensorListener, mLightSensor, 4195d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza lightSensorRate * 1000, mHandler); 4205d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4215d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4225d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 42357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik private boolean setAutoBrightnessAdjustment(float adjustment) { 42457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik return mBrightnessMapper.setAutoBrightnessAdjustment(adjustment); 425639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 426639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 427639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void setAmbientLux(float lux) { 4280a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 4290a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright Slog.d(TAG, "setAmbientLux(" + lux + ")"); 4300a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 431d846023804ddadcd692666152db420c54594ddb9Michael Wright if (lux < 0) { 432c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.w(TAG, "Ambient lux was negative, ignoring and setting to 0"); 433d846023804ddadcd692666152db420c54594ddb9Michael Wright lux = 0; 434d846023804ddadcd692666152db420c54594ddb9Michael Wright } 435639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLux = lux; 436428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza mBrighteningLuxThreshold = mDynamicHysteresis.getBrighteningThreshold(lux); 437428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza mDarkeningLuxThreshold = mDynamicHysteresis.getDarkeningThreshold(lux); 438c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 439c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // If the short term model was invalidated and the change is drastic enough, reset it. 440c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (!mShortTermModelValid && mShortTermModelAnchor != -1) { 441c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik final float minAmbientLux = 442c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor - mShortTermModelAnchor * SHORT_TERM_MODEL_THRESHOLD_RATIO; 443c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik final float maxAmbientLux = 444c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor + mShortTermModelAnchor * SHORT_TERM_MODEL_THRESHOLD_RATIO; 445c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (minAmbientLux < mAmbientLux && mAmbientLux < maxAmbientLux) { 44657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik if (DEBUG) { 44757d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik Slog.d(TAG, "ShortTermModel: re-validate user data, ambient lux is " + 44857d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik minAmbientLux + " < " + mAmbientLux + " < " + maxAmbientLux); 44957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik } 450c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 451c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } else { 452c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: reset data, ambient lux is " + mAmbientLux + 45357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "(" + minAmbientLux + ", " + maxAmbientLux + ")"); 454c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik resetShortTermModel(); 455c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 456c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 457639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 458639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 4590a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private float calculateAmbientLux(long now, long horizon) { 4600a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 4610a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright Slog.d(TAG, "calculateAmbientLux(" + now + ", " + horizon + ")"); 4620a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 463639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 464639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (N == 0) { 465639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright Slog.e(TAG, "calculateAmbientLux: No ambient light readings available"); 466639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return -1; 467639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 4680a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 4690a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Find the first measurement that is just outside of the horizon. 4700a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright int endIndex = 0; 4710a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright final long horizonStartTime = now - horizon; 4720a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright for (int i = 0; i < N-1; i++) { 4730a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (mAmbientLightRingBuffer.getTime(i + 1) <= horizonStartTime) { 4740a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright endIndex++; 4750a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } else { 4760a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright break; 4770a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 4780a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 4790a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 48057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik Slog.d(TAG, "calculateAmbientLux: selected endIndex=" + endIndex + ", point=(" + 48157d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mAmbientLightRingBuffer.getTime(endIndex) + ", " + 48257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mAmbientLightRingBuffer.getLux(endIndex) + ")"); 4830a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 484639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float sum = 0; 485639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float totalWeight = 0; 486639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long endTime = AMBIENT_LIGHT_PREDICTION_TIME_MILLIS; 4870a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright for (int i = N - 1; i >= endIndex; i--) { 4880a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright long eventTime = mAmbientLightRingBuffer.getTime(i); 4890a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (i == endIndex && eventTime < horizonStartTime) { 4900a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // If we're at the final value, make sure we only consider the part of the sample 4910a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // within our desired horizon. 4920a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright eventTime = horizonStartTime; 4930a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 4940a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright final long startTime = eventTime - now; 495639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float weight = calculateWeight(startTime, endTime); 496639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float lux = mAmbientLightRingBuffer.getLux(i); 497639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 498c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "calculateAmbientLux: [" + startTime + ", " + endTime + "]: " + 49957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "lux=" + lux + ", " + 50057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "weight=" + weight); 501639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 502639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright totalWeight += weight; 503c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik sum += lux * weight; 504639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright endTime = startTime; 505639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 506639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 507c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "calculateAmbientLux: " + 50857d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "totalWeight=" + totalWeight + ", " + 50957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "newAmbientLux=" + (sum / totalWeight)); 510639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 511639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return sum / totalWeight; 512639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 513639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 5146fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private float calculateWeight(long startDelta, long endDelta) { 515639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return weightIntegral(endDelta) - weightIntegral(startDelta); 516639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 517639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 5186fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // Evaluates the integral of y = x + mWeightingIntercept. This is always positive for the 519639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // horizon we're looking at and provides a non-linear weighting for light samples. 5206fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private float weightIntegral(long x) { 5216fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic return x * (x * 0.5f + mWeightingIntercept); 522639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 523639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 524639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long nextAmbientLightBrighteningTransition(long time) { 525639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 526639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long earliestValidTime = time; 527639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright for (int i = N - 1; i >= 0; i--) { 528639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mAmbientLightRingBuffer.getLux(i) <= mBrighteningLuxThreshold) { 529639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 530639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 531639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright earliestValidTime = mAmbientLightRingBuffer.getTime(i); 532639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 533d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski return earliestValidTime + mBrighteningLightDebounceConfig; 534639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 535639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 536639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long nextAmbientLightDarkeningTransition(long time) { 537639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 538639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long earliestValidTime = time; 539639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright for (int i = N - 1; i >= 0; i--) { 540639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mAmbientLightRingBuffer.getLux(i) >= mDarkeningLuxThreshold) { 541639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 542639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 543639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright earliestValidTime = mAmbientLightRingBuffer.getTime(i); 544639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 545d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski return earliestValidTime + mDarkeningLightDebounceConfig; 546639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 547639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 548639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAmbientLux() { 549639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long time = SystemClock.uptimeMillis(); 5506fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon); 551639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(time); 552639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 553639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 554639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAmbientLux(long time) { 555639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If the light sensor was just turned on then immediately update our initial 556639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // estimate of the current ambient light level. 557639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mAmbientLuxValid) { 558639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final long timeWhenSensorWarmedUp = 559639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorWarmUpTimeConfig + mLightSensorEnableTime; 560639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (time < timeWhenSensorWarmedUp) { 561639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 562c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Sensor not ready yet: " + 56357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "time=" + time + ", " + 56457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "timeWhenSensorWarmedUp=" + timeWhenSensorWarmedUp); 565639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 566639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.sendEmptyMessageAtTime(MSG_UPDATE_AMBIENT_LUX, 567639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright timeWhenSensorWarmedUp); 568639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 569639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 5700a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright setAmbientLux(calculateAmbientLux(time, AMBIENT_LIGHT_SHORT_HORIZON_MILLIS)); 571639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLuxValid = true; 572639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 573c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Initializing: " + 574c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik "mAmbientLightRingBuffer=" + mAmbientLightRingBuffer + ", " + 575c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik "mAmbientLux=" + mAmbientLux); 576639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 577639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(true); 578639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 579639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 580639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextBrightenTransition = nextAmbientLightBrighteningTransition(time); 581639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextDarkenTransition = nextAmbientLightDarkeningTransition(time); 5820a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Essentially, we calculate both a slow ambient lux, to ensure there's a true long-term 5830a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // change in lighting conditions, and a fast ambient lux to determine what the new 5840a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // brightness situation is since the slow lux can be quite slow to converge. 5850a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // 5860a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Note that both values need to be checked for sufficient change before updating the 5870a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // proposed ambient light value since the slow value might be sufficiently far enough away 5880a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // from the fast value to cause a recalculation while its actually just converging on 5890a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // the fast value still. 5900a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright float slowAmbientLux = calculateAmbientLux(time, AMBIENT_LIGHT_LONG_HORIZON_MILLIS); 5910a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright float fastAmbientLux = calculateAmbientLux(time, AMBIENT_LIGHT_SHORT_HORIZON_MILLIS); 5920a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 593c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if ((slowAmbientLux >= mBrighteningLuxThreshold && 594c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik fastAmbientLux >= mBrighteningLuxThreshold && 595c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik nextBrightenTransition <= time) 596c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik || 597c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik (slowAmbientLux <= mDarkeningLuxThreshold && 598c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik fastAmbientLux <= mDarkeningLuxThreshold && 599c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik nextDarkenTransition <= time)) { 6000a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright setAmbientLux(fastAmbientLux); 601639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 602c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: " + 60357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik ((fastAmbientLux > mAmbientLux) ? "Brightened" : "Darkened") + ": " + 60457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold + ", " + 60557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mAmbientLightRingBuffer=" + mAmbientLightRingBuffer + ", " + 60657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mAmbientLux=" + mAmbientLux); 607639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 608639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(true); 609639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextBrightenTransition = nextAmbientLightBrighteningTransition(time); 610639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextDarkenTransition = nextAmbientLightDarkeningTransition(time); 611639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 612639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextTransitionTime = Math.min(nextDarkenTransition, nextBrightenTransition); 613639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If one of the transitions is ready to occur, but the total weighted ambient lux doesn't 614639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // exceed the necessary threshold, then it's possible we'll get a transition time prior to 615639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // now. Rather than continually checking to see whether the weighted lux exceeds the 616639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // threshold, schedule an update for when we'd normally expect another light sample, which 617639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // should be enough time to decide whether we should actually transition to the new 618639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // weighted ambient lux or not. 619639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextTransitionTime = 6205d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza nextTransitionTime > time ? nextTransitionTime : time + mNormalLightSensorRate; 621639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 622c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Scheduling ambient lux update for " + 62357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik nextTransitionTime + TimeUtils.formatUptime(nextTransitionTime)); 624639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 625639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.sendEmptyMessageAtTime(MSG_UPDATE_AMBIENT_LUX, nextTransitionTime); 626639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 627639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 628639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAutoBrightness(boolean sendUpdate) { 629639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mAmbientLuxValid) { 630639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 631639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 632639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 633eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright float value = mBrightnessMapper.getBrightness(mAmbientLux); 634639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 635639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int newScreenAutoBrightness = 636a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown clampScreenBrightness(Math.round(value * PowerManager.BRIGHTNESS_ON)); 637639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mScreenAutoBrightness != newScreenAutoBrightness) { 638639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 639c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAutoBrightness: " + 64057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mScreenAutoBrightness=" + mScreenAutoBrightness + ", " + 64157d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "newScreenAutoBrightness=" + newScreenAutoBrightness); 642639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 643639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 644639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenAutoBrightness = newScreenAutoBrightness; 645639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (sendUpdate) { 646639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCallbacks.updateBrightness(); 647639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 648639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 649639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 650639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 651639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int clampScreenBrightness(int value) { 652639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return MathUtils.constrain(value, 653639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 654639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 655639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 656a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void prepareBrightnessAdjustmentSample() { 657a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (!mBrightnessAdjustmentSamplePending) { 658a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = true; 659a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldLux = mAmbientLuxValid ? mAmbientLux : -1; 660a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldBrightness = mScreenAutoBrightness; 661a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } else { 662a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.removeMessages(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE); 663a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 664a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 665a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.sendEmptyMessageDelayed(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE, 666a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown BRIGHTNESS_ADJUSTMENT_SAMPLE_DEBOUNCE_MILLIS); 667a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 668a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 669a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void cancelBrightnessAdjustmentSample() { 670a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mBrightnessAdjustmentSamplePending) { 671a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = false; 672a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.removeMessages(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE); 673a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 674a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 675a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 676a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void collectBrightnessAdjustmentSample() { 677a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mBrightnessAdjustmentSamplePending) { 678a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = false; 679a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mAmbientLuxValid && mScreenAutoBrightness >= 0) { 680a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (DEBUG) { 681c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "Auto-brightness adjustment changed by user: " + 68257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "lux=" + mAmbientLux + ", " + 68357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "brightness=" + mScreenAutoBrightness + ", " + 68457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "ring=" + mAmbientLightRingBuffer); 685a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 686a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 687a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown EventLog.writeEvent(EventLogTags.AUTO_BRIGHTNESS_ADJ, 688a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldLux, 689a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldBrightness, 690a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mAmbientLux, 69157d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mScreenAutoBrightness); 692a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 693a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 694a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 695a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 696639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final class AutomaticBrightnessHandler extends Handler { 697639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public AutomaticBrightnessHandler(Looper looper) { 698639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright super(looper, null, true /*async*/); 699639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 700639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 701639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 702639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void handleMessage(Message msg) { 703639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright switch (msg.what) { 704639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright case MSG_UPDATE_AMBIENT_LUX: 705639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(); 706639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 707a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 708a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown case MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE: 709a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown collectBrightnessAdjustmentSample(); 710a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown break; 711d846023804ddadcd692666152db420c54594ddb9Michael Wright 712c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik case MSG_INVALIDATE_SHORT_TERM_MODEL: 713c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik invalidateShortTermModel(); 714d846023804ddadcd692666152db420c54594ddb9Michael Wright break; 715639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 716639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 717639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 718639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 719639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final SensorEventListener mLightSensorListener = new SensorEventListener() { 720639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 721639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void onSensorChanged(SensorEvent event) { 722639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mLightSensorEnabled) { 723639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final long time = SystemClock.uptimeMillis(); 724639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final float lux = event.values[0]; 725639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright handleLightSensorEvent(time, lux); 726639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 727639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 728639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 729639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 730639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void onAccuracyChanged(Sensor sensor, int accuracy) { 731639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Not used. 732639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 733639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright }; 734639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 735639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright /** Callbacks to request updates to the display's power state. */ 736639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright interface Callbacks { 737639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright void updateBrightness(); 738639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 739639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 7400a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright /** 7410a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * A ring buffer of ambient light measurements sorted by time. 7420a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * 7430a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * Each entry consists of a timestamp and a lux measurement, and the overall buffer is sorted 7440a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * from oldest to newest. 7450a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright */ 746103fb78ac1b91874f8b90cc5a165e6f0502179c4Michael Wright private static final class AmbientLightRingBuffer { 747639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Proportional extra capacity of the buffer beyond the expected number of light samples 748639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // in the horizon 749639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final float BUFFER_SLACK = 1.5f; 750639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float[] mRingLux; 751639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long[] mRingTime; 752639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mCapacity; 753639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 754639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The first valid element and the next open slot. 755639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Note that if mCount is zero then there are no valid elements. 756639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mStart; 757639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mEnd; 758639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mCount; 759639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 7606fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic public AmbientLightRingBuffer(long lightSensorRate, int ambientLightHorizon) { 7616fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mCapacity = (int) Math.ceil(ambientLightHorizon * BUFFER_SLACK / lightSensorRate); 762639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux = new float[mCapacity]; 763639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime = new long[mCapacity]; 764639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 765639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 766639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public float getLux(int index) { 767639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mRingLux[offsetOf(index)]; 768639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 769639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 770639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public long getTime(int index) { 771639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mRingTime[offsetOf(index)]; 772639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 773639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 774639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void push(long time, float lux) { 775639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int next = mEnd; 776639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mCount == mCapacity) { 777639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int newSize = mCapacity * 2; 778639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 779639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float[] newRingLux = new float[newSize]; 780639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long[] newRingTime = new long[newSize]; 781639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int length = mCapacity - mStart; 782639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingLux, mStart, newRingLux, 0, length); 783639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingTime, mStart, newRingTime, 0, length); 784639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mStart != 0) { 785639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingLux, 0, newRingLux, length, mStart); 786639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingTime, 0, newRingTime, length, mStart); 787639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 788639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux = newRingLux; 789639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime = newRingTime; 790639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 791639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright next = mCapacity; 792639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCapacity = newSize; 793639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = 0; 794639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 795639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime[next] = time; 796639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux[next] = lux; 797639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = next + 1; 798639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mEnd == mCapacity) { 799639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = 0; 800639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 801639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount++; 802639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 803639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 804639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void prune(long horizon) { 805639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mCount == 0) { 806639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 807639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 808639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 809639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright while (mCount > 1) { 810639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int next = mStart + 1; 811639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (next >= mCapacity) { 812639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright next -= mCapacity; 813639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 814639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mRingTime[next] > horizon) { 815639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Some light sensors only produce data upon a change in the ambient light 816639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // levels, so we need to consider the previous measurement as the ambient light 817639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // level for all points in time up until we receive a new measurement. Thus, we 818639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // always want to keep the youngest element that would be removed from the 819639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // buffer and just set its measurement time to the horizon time since at that 820639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // point it is the ambient light level, and to remove it would be to drop a 821639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // valid data point within our horizon. 822639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 823639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 824639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = next; 825639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount -= 1; 826639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 827639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 828639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mRingTime[mStart] < horizon) { 829639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime[mStart] = horizon; 830639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 831639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 832639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 833639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public int size() { 834639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mCount; 835639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 836639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 837639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void clear() { 838639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = 0; 839639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = 0; 840639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount = 0; 841639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 842639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 843639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 844639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public String toString() { 845a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown StringBuffer buf = new StringBuffer(); 846a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append('['); 847a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown for (int i = 0; i < mCount; i++) { 848a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown final long next = i + 1 < mCount ? getTime(i + 1) : SystemClock.uptimeMillis(); 849a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (i != 0) { 850a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(", "); 851a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 852a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(getLux(i)); 853a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(" / "); 854a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(next - getTime(i)); 855a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append("ms"); 856639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 857a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(']'); 858a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown return buf.toString(); 859639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 860639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 861639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int offsetOf(int index) { 862639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (index >= mCount || index < 0) { 863639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright throw new ArrayIndexOutOfBoundsException(index); 864639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 865639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright index += mStart; 866639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (index >= mCapacity) { 867639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright index -= mCapacity; 868639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 869639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return index; 870639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 871639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 872639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright} 873