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; 232155bc2be3d38b876335eb06f08e81fc2d563831Michael Wrightimport android.app.ActivityManager; 24639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.Sensor; 25639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorEvent; 26639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorEventListener; 27639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.hardware.SensorManager; 28eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wrightimport android.hardware.display.BrightnessConfiguration; 29d846023804ddadcd692666152db420c54594ddb9Michael Wrightimport android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 302155bc2be3d38b876335eb06f08e81fc2d563831Michael Wrightimport android.os.Build; 31639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Handler; 32639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Looper; 33639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.Message; 34639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.PowerManager; 35639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.os.SystemClock; 36b0a1d3d08fc459e0d9937e299e16de17d1388ac4Michael Wrightimport android.os.Trace; 37639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.text.format.DateUtils; 38a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brownimport android.util.EventLog; 39639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.MathUtils; 40639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.Slog; 41639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport android.util.TimeUtils; 42639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 43639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightimport java.io.PrintWriter; 44639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 45639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wrightclass AutomaticBrightnessController { 46639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final String TAG = "AutomaticBrightnessController"; 47639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 48639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final boolean DEBUG = false; 49639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final boolean DEBUG_PRETEND_LIGHT_SENSOR_ABSENT = false; 50639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 51639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If true, enables the use of the screen auto-brightness adjustment setting. 52daf7d410fc97647f2b3ab4254f73c09c923018deAdrian Roos private static final boolean USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT = true; 53639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 54639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // How long the current sensor reading is assumed to be valid beyond the current time. 55639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // This provides a bit of prediction, as well as ensures that the weight for the last sample is 56639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // non-zero, which in turn ensures that the total weight is non-zero. 57639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final long AMBIENT_LIGHT_PREDICTION_TIME_MILLIS = 100; 58639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 59a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // Debounce for sampling user-initiated changes in display brightness to ensure 60a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // the user is satisfied with the result before storing the sample. 61a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private static final int BRIGHTNESS_ADJUSTMENT_SAMPLE_DEBOUNCE_MILLIS = 10000; 62a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 63d846023804ddadcd692666152db420c54594ddb9Michael Wright // Timeout after which we remove the effects any user interactions might've had on the 64d846023804ddadcd692666152db420c54594ddb9Michael Wright // brightness mapping. This timeout doesn't start until we transition to a non-interactive 65d846023804ddadcd692666152db420c54594ddb9Michael Wright // display policy so that we don't reset while users are using their devices, but also so that 66d846023804ddadcd692666152db420c54594ddb9Michael Wright // we don't erroneously keep the short-term model if the device is dozing but the display is 67d846023804ddadcd692666152db420c54594ddb9Michael Wright // fully on. 68d846023804ddadcd692666152db420c54594ddb9Michael Wright private static final int SHORT_TERM_MODEL_TIMEOUT_MILLIS = 30000; 69d846023804ddadcd692666152db420c54594ddb9Michael Wright 70639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final int MSG_UPDATE_AMBIENT_LUX = 1; 71a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private static final int MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE = 2; 72c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private static final int MSG_INVALIDATE_SHORT_TERM_MODEL = 3; 73639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 740a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Length of the ambient light horizon used to calculate the long term estimate of ambient 750a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // light. 760a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private static final int AMBIENT_LIGHT_LONG_HORIZON_MILLIS = 10000; 770a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 780a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Length of the ambient light horizon used to calculate short-term estimate of ambient light. 790a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private static final int AMBIENT_LIGHT_SHORT_HORIZON_MILLIS = 2000; 800a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 81428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza // Callbacks for requesting updates to the display's power state 82639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final Callbacks mCallbacks; 83639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 84639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The sensor manager. 85639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final SensorManager mSensorManager; 86639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 87639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The light sensor, or null if not available or needed. 88639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final Sensor mLightSensor; 89639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 90eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright // The mapper to translate ambient lux to screen brightness in the range [0, 1.0]. 91eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright private final BrightnessMappingStrategy mBrightnessMapper; 92639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 93639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The minimum and maximum screen brightnesses. 94639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final int mScreenBrightnessRangeMinimum; 95639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final int mScreenBrightnessRangeMaximum; 962155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright 972155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright // How much to scale doze brightness by (should be (0, 1.0]). 98a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski private final float mDozeScaleFactor; 99639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 1005d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // Initial light sensor event rate in milliseconds. 1015d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private final int mInitialLightSensorRate; 1025d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 1035d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // Steady-state light sensor event rate in milliseconds. 1045d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private final int mNormalLightSensorRate; 1055d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 1065d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // The current light sensor event rate in milliseconds. 1075d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private int mCurrentLightSensorRate; 108d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 109d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // Stability requirements in milliseconds for accepting a new brightness level. This is used 110d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // for debouncing the light sensor. Different constants are used to debounce the light sensor 111d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // when adapting to brighter or darker environments. This parameter controls how quickly 112d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // brightness changes occur in response to an observed change in light level that exceeds the 113d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // hysteresis threshold. 114d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final long mBrighteningLightDebounceConfig; 115d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final long mDarkeningLightDebounceConfig; 116d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 117d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // If true immediately after the screen is turned on the controller will try to adjust the 118d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // brightness based on the current sensor reads. If false, the controller will collect more data 119d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski // and only then decide whether to change brightness. 120d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski private final boolean mResetAmbientLuxAfterWarmUpConfig; 121d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski 1226fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // Period of time in which to consider light samples in milliseconds. 1236fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private final int mAmbientLightHorizon; 1246fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic 1256fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // The intercept used for the weighting calculation. This is used in order to keep all possible 1266fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // weighting values positive. 1276fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private final int mWeightingIntercept; 1286fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic 1292155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright // Configuration object for determining thresholds to change brightness dynamically 1302155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright private final HysteresisLevels mHysteresisLevels; 131428aed01e1e2923968027dff57132d8d8d5c4905Julius D'souza 132639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Amount of time to delay auto-brightness after screen on while waiting for 133639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // the light sensor to warm-up in milliseconds. 134639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // May be 0 if no warm-up is required. 135639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mLightSensorWarmUpTimeConfig; 136639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 137639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Set to true if the light sensor is enabled. 138639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean mLightSensorEnabled; 139639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 140639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The time when the light sensor was enabled. 141639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long mLightSensorEnableTime; 142639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 143639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The currently accepted nominal ambient light level. 144639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mAmbientLux; 145639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 146639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // True if mAmbientLux holds a valid value. 147639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean mAmbientLuxValid; 148639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 149639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The ambient light level threshold at which to brighten or darken the screen. 150639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mBrighteningLuxThreshold; 151639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mDarkeningLuxThreshold; 152639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 153639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The most recent light sample. 154639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float mLastObservedLux; 155639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 156639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The time of the most light recent sample. 157639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long mLastObservedLuxTime; 158639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 159639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The number of light samples collected since the light sensor was enabled. 160639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mRecentLightSamples; 161639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 162639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // A ring buffer containing all of the recent ambient light sensor readings. 163639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private AmbientLightRingBuffer mAmbientLightRingBuffer; 164639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 165639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The handler 166639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private AutomaticBrightnessHandler mHandler; 167639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 168639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The screen brightness level that has been chosen by the auto-brightness 169639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // algorithm. The actual brightness should ramp towards this value. 170639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // We preserve this value even when we stop using the light sensor so 171639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // that we can quickly revert to the previous auto-brightness level 172639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // while the light sensor warms up. 173639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Use -1 if there is no current auto-brightness value available. 174639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mScreenAutoBrightness = -1; 175639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 176d846023804ddadcd692666152db420c54594ddb9Michael Wright // The current display policy. This is useful, for example, for knowing when we're dozing, 177d846023804ddadcd692666152db420c54594ddb9Michael Wright // where the light sensor may not be available. 178d846023804ddadcd692666152db420c54594ddb9Michael Wright private int mDisplayPolicy = DisplayPowerRequest.POLICY_OFF; 179a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski 180a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // True if we are collecting a brightness adjustment sample, along with some data 181a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown // for the initial state of the sample. 182a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private boolean mBrightnessAdjustmentSamplePending; 183a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private float mBrightnessAdjustmentSampleOldLux; 184a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private int mBrightnessAdjustmentSampleOldBrightness; 185a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 186c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // When the short term model is invalidated, we don't necessarily reset it (i.e. clear the 187c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // user's adjustment) immediately, but wait for a drastic enough change in the ambient light. 188c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // The anchor determines what were the light levels when the user has set her preference, and 189c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // we use a relative threshold to determine when to revert to the OEM curve. 190c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private boolean mShortTermModelValid; 191c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private float mShortTermModelAnchor; 192c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private float SHORT_TERM_MODEL_THRESHOLD_RATIO = 0.6f; 193c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 194639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public AutomaticBrightnessController(Callbacks callbacks, Looper looper, 19557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik SensorManager sensorManager, BrightnessMappingStrategy mapper, 19657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik int lightSensorWarmUpTime, int brightnessMin, int brightnessMax, float dozeScaleFactor, 1975d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza int lightSensorRate, int initialLightSensorRate, long brighteningLightDebounceConfig, 1986fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic long darkeningLightDebounceConfig, boolean resetAmbientLuxAfterWarmUpConfig, 1992155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright HysteresisLevels hysteresisLevels) { 200639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCallbacks = callbacks; 201639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mSensorManager = sensorManager; 202eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright mBrightnessMapper = mapper; 203639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMinimum = brightnessMin; 204639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMaximum = brightnessMax; 205639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorWarmUpTimeConfig = lightSensorWarmUpTime; 206a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski mDozeScaleFactor = dozeScaleFactor; 2075d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mNormalLightSensorRate = lightSensorRate; 2085d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mInitialLightSensorRate = initialLightSensorRate; 2095d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = -1; 210d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mBrighteningLightDebounceConfig = brighteningLightDebounceConfig; 211d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mDarkeningLightDebounceConfig = darkeningLightDebounceConfig; 212d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski mResetAmbientLuxAfterWarmUpConfig = resetAmbientLuxAfterWarmUpConfig; 2132155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mAmbientLightHorizon = AMBIENT_LIGHT_LONG_HORIZON_MILLIS; 2142155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mWeightingIntercept = AMBIENT_LIGHT_LONG_HORIZON_MILLIS; 2152155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mHysteresisLevels = hysteresisLevels; 216c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 217c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = -1; 218639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 219639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler = new AutomaticBrightnessHandler(looper); 220103fb78ac1b91874f8b90cc5a165e6f0502179c4Michael Wright mAmbientLightRingBuffer = 2215d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza new AmbientLightRingBuffer(mNormalLightSensorRate, mAmbientLightHorizon); 222639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 223639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!DEBUG_PRETEND_LIGHT_SENSOR_ABSENT) { 224639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); 225639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 226639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 227639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 228639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public int getAutomaticScreenBrightness() { 2295878442bc6c23a1c1cd87a5fb1a2c241329835aaDan Gittik if (!mAmbientLuxValid) { 2305878442bc6c23a1c1cd87a5fb1a2c241329835aaDan Gittik return -1; 2315878442bc6c23a1c1cd87a5fb1a2c241329835aaDan Gittik } 232d846023804ddadcd692666152db420c54594ddb9Michael Wright if (mDisplayPolicy == DisplayPowerRequest.POLICY_DOZE) { 233a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski return (int) (mScreenAutoBrightness * mDozeScaleFactor); 234a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski } 235639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mScreenAutoBrightness; 236639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 237639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 238617564ff2cdee2e9a50339544129283503ae71a8Michael Wright public float getAutomaticScreenBrightnessAdjustment() { 23957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik return mBrightnessMapper.getAutoBrightnessAdjustment(); 240617564ff2cdee2e9a50339544129283503ae71a8Michael Wright } 241617564ff2cdee2e9a50339544129283503ae71a8Michael Wright 242eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright public void configure(boolean enable, @Nullable BrightnessConfiguration configuration, 243617564ff2cdee2e9a50339544129283503ae71a8Michael Wright float brightness, boolean userChangedBrightness, float adjustment, 244617564ff2cdee2e9a50339544129283503ae71a8Michael Wright boolean userChangedAutoBrightnessAdjustment, int displayPolicy) { 245a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // While dozing, the application processor may be suspended which will prevent us from 246a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // receiving new information from the light sensor. On some devices, we may be able to 247a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // switch to a wake-up light sensor instead but for now we will simply disable the sensor 248a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // and hold onto the last computed screen auto brightness. We save the dozing flag for 249a15aa7d426972daecc0e8cd31dcf4d6bc656f1e9Filip Gruszczynski // debugging purposes. 250d846023804ddadcd692666152db420c54594ddb9Michael Wright boolean dozing = (displayPolicy == DisplayPowerRequest.POLICY_DOZE); 251eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright boolean changed = setBrightnessConfiguration(configuration); 252d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setDisplayPolicy(displayPolicy); 25357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik if (userChangedAutoBrightnessAdjustment) { 25457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik changed |= setAutoBrightnessAdjustment(adjustment); 25557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik } 256617564ff2cdee2e9a50339544129283503ae71a8Michael Wright if (userChangedBrightness && enable) { 257617564ff2cdee2e9a50339544129283503ae71a8Michael Wright // Update the brightness curve with the new user control point. It's critical this 258617564ff2cdee2e9a50339544129283503ae71a8Michael Wright // happens after we update the autobrightness adjustment since it may reset it. 259d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setScreenBrightnessByUser(brightness); 260617564ff2cdee2e9a50339544129283503ae71a8Michael Wright } 261617564ff2cdee2e9a50339544129283503ae71a8Michael Wright final boolean userInitiatedChange = 262617564ff2cdee2e9a50339544129283503ae71a8Michael Wright userChangedBrightness || userChangedAutoBrightnessAdjustment; 263617564ff2cdee2e9a50339544129283503ae71a8Michael Wright if (userInitiatedChange && enable && !dozing) { 264a8edffd804d3940dec1fa5c9777d10beccb2f6a6Soroosh Mariooryad prepareBrightnessAdjustmentSample(); 265a8edffd804d3940dec1fa5c9777d10beccb2f6a6Soroosh Mariooryad } 266d846023804ddadcd692666152db420c54594ddb9Michael Wright changed |= setLightSensorEnabled(enable && !dozing); 267970d4132ea28e748c1010be39450a98bbf7466f3Jeff Brown if (changed) { 268639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(false /*sendUpdate*/); 269639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 270639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 271639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 27253d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy public boolean hasUserDataPoints() { 27353d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy return mBrightnessMapper.hasUserDataPoints(); 27453d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy } 27553d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy 27653d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy public boolean isDefaultConfig() { 27753d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy return mBrightnessMapper.isDefaultConfig(); 27853d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy } 27953d0661f38d6ada39aefaac5ce016f802e74bd44Kenny Guy 2806d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy public BrightnessConfiguration getDefaultConfig() { 2816d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy return mBrightnessMapper.getDefaultConfig(); 2826d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy } 2836d1009f882f1b0234e77ec3bb583a58090bfff39Kenny Guy 284d846023804ddadcd692666152db420c54594ddb9Michael Wright private boolean setDisplayPolicy(int policy) { 285d846023804ddadcd692666152db420c54594ddb9Michael Wright if (mDisplayPolicy == policy) { 286d846023804ddadcd692666152db420c54594ddb9Michael Wright return false; 287d846023804ddadcd692666152db420c54594ddb9Michael Wright } 288d846023804ddadcd692666152db420c54594ddb9Michael Wright final int oldPolicy = mDisplayPolicy; 289d846023804ddadcd692666152db420c54594ddb9Michael Wright mDisplayPolicy = policy; 290d846023804ddadcd692666152db420c54594ddb9Michael Wright if (DEBUG) { 291c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "Display policy transitioning from " + oldPolicy + " to " + policy); 292d846023804ddadcd692666152db420c54594ddb9Michael Wright } 293d846023804ddadcd692666152db420c54594ddb9Michael Wright if (!isInteractivePolicy(policy) && isInteractivePolicy(oldPolicy)) { 294c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.sendEmptyMessageDelayed(MSG_INVALIDATE_SHORT_TERM_MODEL, 295d846023804ddadcd692666152db420c54594ddb9Michael Wright SHORT_TERM_MODEL_TIMEOUT_MILLIS); 296d846023804ddadcd692666152db420c54594ddb9Michael Wright } else if (isInteractivePolicy(policy) && !isInteractivePolicy(oldPolicy)) { 297c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.removeMessages(MSG_INVALIDATE_SHORT_TERM_MODEL); 298d846023804ddadcd692666152db420c54594ddb9Michael Wright } 299d846023804ddadcd692666152db420c54594ddb9Michael Wright return true; 300d846023804ddadcd692666152db420c54594ddb9Michael Wright } 301d846023804ddadcd692666152db420c54594ddb9Michael Wright 302d846023804ddadcd692666152db420c54594ddb9Michael Wright private static boolean isInteractivePolicy(int policy) { 303d846023804ddadcd692666152db420c54594ddb9Michael Wright return policy == DisplayPowerRequest.POLICY_BRIGHT 304d846023804ddadcd692666152db420c54594ddb9Michael Wright || policy == DisplayPowerRequest.POLICY_DIM 305d846023804ddadcd692666152db420c54594ddb9Michael Wright || policy == DisplayPowerRequest.POLICY_VR; 306d846023804ddadcd692666152db420c54594ddb9Michael Wright } 307d846023804ddadcd692666152db420c54594ddb9Michael Wright 308d846023804ddadcd692666152db420c54594ddb9Michael Wright private boolean setScreenBrightnessByUser(float brightness) { 309d846023804ddadcd692666152db420c54594ddb9Michael Wright if (!mAmbientLuxValid) { 310d846023804ddadcd692666152db420c54594ddb9Michael Wright // If we don't have a valid ambient lux then we don't have a valid brightness anyways, 311d846023804ddadcd692666152db420c54594ddb9Michael Wright // and we can't use this data to add a new control point to the short-term model. 312d846023804ddadcd692666152db420c54594ddb9Michael Wright return false; 313d846023804ddadcd692666152db420c54594ddb9Michael Wright } 314d846023804ddadcd692666152db420c54594ddb9Michael Wright mBrightnessMapper.addUserDataPoint(mAmbientLux, brightness); 315c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 316c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = mAmbientLux; 317c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (DEBUG) { 318c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: anchor=" + mShortTermModelAnchor); 319c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 320d846023804ddadcd692666152db420c54594ddb9Michael Wright return true; 321d846023804ddadcd692666152db420c54594ddb9Michael Wright } 322d846023804ddadcd692666152db420c54594ddb9Michael Wright 323c135225466eb1b209e12c8c2df135641a21c5d66Dan Gittik public void resetShortTermModel() { 324d846023804ddadcd692666152db420c54594ddb9Michael Wright mBrightnessMapper.clearUserDataPoints(); 325c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 326c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor = -1; 327c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 328c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 329c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik private void invalidateShortTermModel() { 330c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (DEBUG) { 331c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: invalidate user data"); 332c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 333c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = false; 334d846023804ddadcd692666152db420c54594ddb9Michael Wright } 335d846023804ddadcd692666152db420c54594ddb9Michael Wright 336eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright public boolean setBrightnessConfiguration(BrightnessConfiguration configuration) { 337b8f4f77d9e12e125408b058bcbd505f4a0bdd50eMichael Wright if (mBrightnessMapper.setBrightnessConfiguration(configuration)) { 338b8f4f77d9e12e125408b058bcbd505f4a0bdd50eMichael Wright resetShortTermModel(); 339b8f4f77d9e12e125408b058bcbd505f4a0bdd50eMichael Wright return true; 340b8f4f77d9e12e125408b058bcbd505f4a0bdd50eMichael Wright } 341b8f4f77d9e12e125408b058bcbd505f4a0bdd50eMichael Wright return false; 342eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright } 343eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright 344639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void dump(PrintWriter pw) { 345639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(); 346639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println("Automatic Brightness Controller Configuration:"); 347639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 348639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 3492155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mDozeScaleFactor=" + mDozeScaleFactor); 3502155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mInitialLightSensorRate=" + mInitialLightSensorRate); 3512155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mNormalLightSensorRate=" + mNormalLightSensorRate); 352639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorWarmUpTimeConfig=" + mLightSensorWarmUpTimeConfig); 353d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mBrighteningLightDebounceConfig=" + mBrighteningLightDebounceConfig); 354d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mDarkeningLightDebounceConfig=" + mDarkeningLightDebounceConfig); 355d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski pw.println(" mResetAmbientLuxAfterWarmUpConfig=" + mResetAmbientLuxAfterWarmUpConfig); 3562155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mAmbientLightHorizon=" + mAmbientLightHorizon); 3572155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mWeightingIntercept=" + mWeightingIntercept); 358639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 359639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(); 360639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println("Automatic Brightness Controller State:"); 361639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensor=" + mLightSensor); 362639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorEnabled=" + mLightSensorEnabled); 363639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLightSensorEnableTime=" + TimeUtils.formatUptime(mLightSensorEnableTime)); 3642155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mCurrentLightSensorRate=" + mCurrentLightSensorRate); 365639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mAmbientLux=" + mAmbientLux); 3665878442bc6c23a1c1cd87a5fb1a2c241329835aaDan Gittik pw.println(" mAmbientLuxValid=" + mAmbientLuxValid); 367639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mBrighteningLuxThreshold=" + mBrighteningLuxThreshold); 368639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mDarkeningLuxThreshold=" + mDarkeningLuxThreshold); 369639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLastObservedLux=" + mLastObservedLux); 370639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mLastObservedLuxTime=" + TimeUtils.formatUptime(mLastObservedLuxTime)); 371639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mRecentLightSamples=" + mRecentLightSamples); 372639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mAmbientLightRingBuffer=" + mAmbientLightRingBuffer); 373639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright pw.println(" mScreenAutoBrightness=" + mScreenAutoBrightness); 3742155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mDisplayPolicy=" + DisplayPowerRequest.policyToString(mDisplayPolicy)); 375c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik pw.println(" mShortTermModelAnchor=" + mShortTermModelAnchor); 3762155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mShortTermModelValid=" + mShortTermModelValid); 3772155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mBrightnessAdjustmentSamplePending=" + mBrightnessAdjustmentSamplePending); 3782155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mBrightnessAdjustmentSampleOldLux=" + mBrightnessAdjustmentSampleOldLux); 3792155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mBrightnessAdjustmentSampleOldBrightness=" 3802155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright + mBrightnessAdjustmentSampleOldBrightness); 3812155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(" mShortTermModelValid=" + mShortTermModelValid); 382eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright 383eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright pw.println(); 384eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright mBrightnessMapper.dump(pw); 3852155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright 3862155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright pw.println(); 3872155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mHysteresisLevels.dump(pw); 388639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 389639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 390639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private boolean setLightSensorEnabled(boolean enable) { 391639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (enable) { 392639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mLightSensorEnabled) { 393639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorEnabled = true; 394639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorEnableTime = SystemClock.uptimeMillis(); 3955d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = mInitialLightSensorRate; 396639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mSensorManager.registerListener(mLightSensorListener, mLightSensor, 3975d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate * 1000, mHandler); 398639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return true; 399639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 400c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } else if (mLightSensorEnabled) { 401c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mLightSensorEnabled = false; 402c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mAmbientLuxValid = !mResetAmbientLuxAfterWarmUpConfig; 403c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mRecentLightSamples = 0; 404c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mAmbientLightRingBuffer.clear(); 405c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mCurrentLightSensorRate = -1; 406c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mHandler.removeMessages(MSG_UPDATE_AMBIENT_LUX); 407c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mSensorManager.unregisterListener(mLightSensorListener); 408639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 409639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return false; 410639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 411639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 412639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void handleLightSensorEvent(long time, float lux) { 413b0a1d3d08fc459e0d9937e299e16de17d1388ac4Michael Wright Trace.traceCounter(Trace.TRACE_TAG_POWER, "ALS", (int) lux); 414639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.removeMessages(MSG_UPDATE_AMBIENT_LUX); 415639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 4165d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (mAmbientLightRingBuffer.size() == 0) { 4175d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // switch to using the steady-state sample rate after grabbing the initial light sample 4185d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza adjustLightSensorRate(mNormalLightSensorRate); 4195d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 420639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright applyLightSensorMeasurement(time, lux); 421639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(time); 422639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 423639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 424639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void applyLightSensorMeasurement(long time, float lux) { 425639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRecentLightSamples++; 4266fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon); 427639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLightRingBuffer.push(time, lux); 428639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 429639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Remember this sample value. 430639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLastObservedLux = lux; 431639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLastObservedLuxTime = time; 432639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 433639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 4345d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza private void adjustLightSensorRate(int lightSensorRate) { 4355d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza // if the light sensor rate changed, update the sensor listener 4365d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (lightSensorRate != mCurrentLightSensorRate) { 4375d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza if (DEBUG) { 438c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "adjustLightSensorRate: " + 43957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "previousRate=" + mCurrentLightSensorRate + ", " + 44057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "currentRate=" + lightSensorRate); 4415d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4425d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mCurrentLightSensorRate = lightSensorRate; 4435d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mSensorManager.unregisterListener(mLightSensorListener); 4445d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza mSensorManager.registerListener(mLightSensorListener, mLightSensor, 4455d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza lightSensorRate * 1000, mHandler); 4465d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4475d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza } 4485d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza 44957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik private boolean setAutoBrightnessAdjustment(float adjustment) { 45057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik return mBrightnessMapper.setAutoBrightnessAdjustment(adjustment); 451639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 452639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 453639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void setAmbientLux(float lux) { 4540a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 4550a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright Slog.d(TAG, "setAmbientLux(" + lux + ")"); 4560a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 457d846023804ddadcd692666152db420c54594ddb9Michael Wright if (lux < 0) { 458c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.w(TAG, "Ambient lux was negative, ignoring and setting to 0"); 459d846023804ddadcd692666152db420c54594ddb9Michael Wright lux = 0; 460d846023804ddadcd692666152db420c54594ddb9Michael Wright } 461639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLux = lux; 4622155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mBrighteningLuxThreshold = mHysteresisLevels.getBrighteningThreshold(lux); 4632155bc2be3d38b876335eb06f08e81fc2d563831Michael Wright mDarkeningLuxThreshold = mHysteresisLevels.getDarkeningThreshold(lux); 464c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik 465c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik // If the short term model was invalidated and the change is drastic enough, reset it. 466c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (!mShortTermModelValid && mShortTermModelAnchor != -1) { 467c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik final float minAmbientLux = 468c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor - mShortTermModelAnchor * SHORT_TERM_MODEL_THRESHOLD_RATIO; 469c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik final float maxAmbientLux = 470c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelAnchor + mShortTermModelAnchor * SHORT_TERM_MODEL_THRESHOLD_RATIO; 471c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if (minAmbientLux < mAmbientLux && mAmbientLux < maxAmbientLux) { 47257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik if (DEBUG) { 47357d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik Slog.d(TAG, "ShortTermModel: re-validate user data, ambient lux is " + 47457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik minAmbientLux + " < " + mAmbientLux + " < " + maxAmbientLux); 47557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik } 476c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik mShortTermModelValid = true; 477c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } else { 478c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "ShortTermModel: reset data, ambient lux is " + mAmbientLux + 47957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "(" + minAmbientLux + ", " + maxAmbientLux + ")"); 480c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik resetShortTermModel(); 481c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 482c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik } 483639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 484639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 4850a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright private float calculateAmbientLux(long now, long horizon) { 4860a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 4870a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright Slog.d(TAG, "calculateAmbientLux(" + now + ", " + horizon + ")"); 4880a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 489639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 490639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (N == 0) { 491639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright Slog.e(TAG, "calculateAmbientLux: No ambient light readings available"); 492639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return -1; 493639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 4940a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 4950a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Find the first measurement that is just outside of the horizon. 4960a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright int endIndex = 0; 4970a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright final long horizonStartTime = now - horizon; 4980a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright for (int i = 0; i < N-1; i++) { 4990a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (mAmbientLightRingBuffer.getTime(i + 1) <= horizonStartTime) { 5000a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright endIndex++; 5010a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } else { 5020a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright break; 5030a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 5040a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 5050a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (DEBUG) { 50657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik Slog.d(TAG, "calculateAmbientLux: selected endIndex=" + endIndex + ", point=(" + 50757d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mAmbientLightRingBuffer.getTime(endIndex) + ", " + 50857d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mAmbientLightRingBuffer.getLux(endIndex) + ")"); 5090a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 510639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float sum = 0; 511639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float totalWeight = 0; 512639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long endTime = AMBIENT_LIGHT_PREDICTION_TIME_MILLIS; 5130a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright for (int i = N - 1; i >= endIndex; i--) { 5140a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright long eventTime = mAmbientLightRingBuffer.getTime(i); 5150a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright if (i == endIndex && eventTime < horizonStartTime) { 5160a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // If we're at the final value, make sure we only consider the part of the sample 5170a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // within our desired horizon. 5180a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright eventTime = horizonStartTime; 5190a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright } 5200a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright final long startTime = eventTime - now; 521639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float weight = calculateWeight(startTime, endTime); 522639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float lux = mAmbientLightRingBuffer.getLux(i); 523639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 524c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "calculateAmbientLux: [" + startTime + ", " + endTime + "]: " + 52557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "lux=" + lux + ", " + 52657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "weight=" + weight); 527639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 528639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright totalWeight += weight; 529c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik sum += lux * weight; 530639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright endTime = startTime; 531639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 532639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 533c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "calculateAmbientLux: " + 53457d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "totalWeight=" + totalWeight + ", " + 53557d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "newAmbientLux=" + (sum / totalWeight)); 536639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 537639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return sum / totalWeight; 538639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 539639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 5406fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private float calculateWeight(long startDelta, long endDelta) { 541639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return weightIntegral(endDelta) - weightIntegral(startDelta); 542639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 543639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 5446fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic // Evaluates the integral of y = x + mWeightingIntercept. This is always positive for the 545639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // horizon we're looking at and provides a non-linear weighting for light samples. 5466fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic private float weightIntegral(long x) { 5476fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic return x * (x * 0.5f + mWeightingIntercept); 548639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 549639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 550639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long nextAmbientLightBrighteningTransition(long time) { 551639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 552639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long earliestValidTime = time; 553639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright for (int i = N - 1; i >= 0; i--) { 554639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mAmbientLightRingBuffer.getLux(i) <= mBrighteningLuxThreshold) { 555639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 556639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 557639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright earliestValidTime = mAmbientLightRingBuffer.getTime(i); 558639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 559d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski return earliestValidTime + mBrighteningLightDebounceConfig; 560639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 561639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 562639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long nextAmbientLightDarkeningTransition(long time) { 563639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final int N = mAmbientLightRingBuffer.size(); 564639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long earliestValidTime = time; 565639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright for (int i = N - 1; i >= 0; i--) { 566639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mAmbientLightRingBuffer.getLux(i) >= mDarkeningLuxThreshold) { 567639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 568639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 569639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright earliestValidTime = mAmbientLightRingBuffer.getTime(i); 570639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 571d81ecd12cec5e1efa8ca49036bb023746f63d90aFilip Gruszczynski return earliestValidTime + mDarkeningLightDebounceConfig; 572639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 573639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 574639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAmbientLux() { 575639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long time = SystemClock.uptimeMillis(); 5766fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon); 577639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(time); 578639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 579639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 580639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAmbientLux(long time) { 581639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If the light sensor was just turned on then immediately update our initial 582639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // estimate of the current ambient light level. 583639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mAmbientLuxValid) { 584639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final long timeWhenSensorWarmedUp = 585639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mLightSensorWarmUpTimeConfig + mLightSensorEnableTime; 586639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (time < timeWhenSensorWarmedUp) { 587639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 588c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Sensor not ready yet: " + 58957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "time=" + time + ", " + 59057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "timeWhenSensorWarmedUp=" + timeWhenSensorWarmedUp); 591639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 592639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.sendEmptyMessageAtTime(MSG_UPDATE_AMBIENT_LUX, 593639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright timeWhenSensorWarmedUp); 594639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 595639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 5960a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright setAmbientLux(calculateAmbientLux(time, AMBIENT_LIGHT_SHORT_HORIZON_MILLIS)); 597639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mAmbientLuxValid = true; 598639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 599c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Initializing: " + 600c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik "mAmbientLightRingBuffer=" + mAmbientLightRingBuffer + ", " + 601c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik "mAmbientLux=" + mAmbientLux); 602639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 603639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(true); 604639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 605639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 606639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextBrightenTransition = nextAmbientLightBrighteningTransition(time); 607639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextDarkenTransition = nextAmbientLightDarkeningTransition(time); 6080a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Essentially, we calculate both a slow ambient lux, to ensure there's a true long-term 6090a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // change in lighting conditions, and a fast ambient lux to determine what the new 6100a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // brightness situation is since the slow lux can be quite slow to converge. 6110a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // 6120a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // Note that both values need to be checked for sufficient change before updating the 6130a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // proposed ambient light value since the slow value might be sufficiently far enough away 6140a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // from the fast value to cause a recalculation while its actually just converging on 6150a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright // the fast value still. 6160a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright float slowAmbientLux = calculateAmbientLux(time, AMBIENT_LIGHT_LONG_HORIZON_MILLIS); 6170a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright float fastAmbientLux = calculateAmbientLux(time, AMBIENT_LIGHT_SHORT_HORIZON_MILLIS); 6180a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright 619c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik if ((slowAmbientLux >= mBrighteningLuxThreshold && 620c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik fastAmbientLux >= mBrighteningLuxThreshold && 621c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik nextBrightenTransition <= time) 622c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik || 623c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik (slowAmbientLux <= mDarkeningLuxThreshold && 624c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik fastAmbientLux <= mDarkeningLuxThreshold && 625c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik nextDarkenTransition <= time)) { 6260a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright setAmbientLux(fastAmbientLux); 627639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 628c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: " + 62957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik ((fastAmbientLux > mAmbientLux) ? "Brightened" : "Darkened") + ": " + 63057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mBrighteningLuxThreshold=" + mBrighteningLuxThreshold + ", " + 63157d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mAmbientLightRingBuffer=" + mAmbientLightRingBuffer + ", " + 63257d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mAmbientLux=" + mAmbientLux); 633639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 634639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAutoBrightness(true); 635639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextBrightenTransition = nextAmbientLightBrighteningTransition(time); 636639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextDarkenTransition = nextAmbientLightDarkeningTransition(time); 637639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 638639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long nextTransitionTime = Math.min(nextDarkenTransition, nextBrightenTransition); 639639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // If one of the transitions is ready to occur, but the total weighted ambient lux doesn't 640639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // exceed the necessary threshold, then it's possible we'll get a transition time prior to 641639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // now. Rather than continually checking to see whether the weighted lux exceeds the 642639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // threshold, schedule an update for when we'd normally expect another light sample, which 643639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // should be enough time to decide whether we should actually transition to the new 644639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // weighted ambient lux or not. 645639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright nextTransitionTime = 6465d7170963ac0cfa30400292841c3673b8cdea5b5Julius D'souza nextTransitionTime > time ? nextTransitionTime : time + mNormalLightSensorRate; 647639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 648c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAmbientLux: Scheduling ambient lux update for " + 64957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik nextTransitionTime + TimeUtils.formatUptime(nextTransitionTime)); 650639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 651639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mHandler.sendEmptyMessageAtTime(MSG_UPDATE_AMBIENT_LUX, nextTransitionTime); 652639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 653639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 654639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private void updateAutoBrightness(boolean sendUpdate) { 655639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (!mAmbientLuxValid) { 656639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 657639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 658639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 659eef0e13f018f33bf3db2f8311bbb429369e13394Michael Wright float value = mBrightnessMapper.getBrightness(mAmbientLux); 660639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 661639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int newScreenAutoBrightness = 662a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown clampScreenBrightness(Math.round(value * PowerManager.BRIGHTNESS_ON)); 663639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mScreenAutoBrightness != newScreenAutoBrightness) { 664639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (DEBUG) { 665c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "updateAutoBrightness: " + 66657d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "mScreenAutoBrightness=" + mScreenAutoBrightness + ", " + 66757d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "newScreenAutoBrightness=" + newScreenAutoBrightness); 668639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 669639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 670639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenAutoBrightness = newScreenAutoBrightness; 671639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (sendUpdate) { 672639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCallbacks.updateBrightness(); 673639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 674639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 675639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 676639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 677639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int clampScreenBrightness(int value) { 678639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return MathUtils.constrain(value, 679639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 680639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 681639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 682a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void prepareBrightnessAdjustmentSample() { 683a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (!mBrightnessAdjustmentSamplePending) { 684a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = true; 685a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldLux = mAmbientLuxValid ? mAmbientLux : -1; 686a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldBrightness = mScreenAutoBrightness; 687a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } else { 688a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.removeMessages(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE); 689a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 690a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 691a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.sendEmptyMessageDelayed(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE, 692a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown BRIGHTNESS_ADJUSTMENT_SAMPLE_DEBOUNCE_MILLIS); 693a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 694a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 695a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void cancelBrightnessAdjustmentSample() { 696a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mBrightnessAdjustmentSamplePending) { 697a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = false; 698a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mHandler.removeMessages(MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE); 699a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 700a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 701a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 702a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown private void collectBrightnessAdjustmentSample() { 703a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mBrightnessAdjustmentSamplePending) { 704a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSamplePending = false; 705a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (mAmbientLuxValid && mScreenAutoBrightness >= 0) { 706a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (DEBUG) { 707c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik Slog.d(TAG, "Auto-brightness adjustment changed by user: " + 70857d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "lux=" + mAmbientLux + ", " + 70957d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "brightness=" + mScreenAutoBrightness + ", " + 71057d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik "ring=" + mAmbientLightRingBuffer); 711a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 712a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 713a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown EventLog.writeEvent(EventLogTags.AUTO_BRIGHTNESS_ADJ, 714a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldLux, 715a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mBrightnessAdjustmentSampleOldBrightness, 716a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown mAmbientLux, 71757d6f11d6ab5d409f3291923ea34f9be709925bcDan Gittik mScreenAutoBrightness); 718a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 719a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 720a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 721a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 722639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final class AutomaticBrightnessHandler extends Handler { 723639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public AutomaticBrightnessHandler(Looper looper) { 724639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright super(looper, null, true /*async*/); 725639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 726639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 727639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 728639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void handleMessage(Message msg) { 729639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright switch (msg.what) { 730639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright case MSG_UPDATE_AMBIENT_LUX: 731639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright updateAmbientLux(); 732639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 733a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown 734a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown case MSG_BRIGHTNESS_ADJUSTMENT_SAMPLE: 735a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown collectBrightnessAdjustmentSample(); 736a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown break; 737d846023804ddadcd692666152db420c54594ddb9Michael Wright 738c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik case MSG_INVALIDATE_SHORT_TERM_MODEL: 739c5d3291487d4b6a09cbeac222831bb1b2203d957Dan Gittik invalidateShortTermModel(); 740d846023804ddadcd692666152db420c54594ddb9Michael Wright break; 741639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 742639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 743639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 744639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 745639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private final SensorEventListener mLightSensorListener = new SensorEventListener() { 746639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 747639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void onSensorChanged(SensorEvent event) { 748639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mLightSensorEnabled) { 749639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final long time = SystemClock.uptimeMillis(); 750639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright final float lux = event.values[0]; 751639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright handleLightSensorEvent(time, lux); 752639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 753639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 754639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 755639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 756639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void onAccuracyChanged(Sensor sensor, int accuracy) { 757639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Not used. 758639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 759639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright }; 760639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 761639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright /** Callbacks to request updates to the display's power state. */ 762639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright interface Callbacks { 763639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright void updateBrightness(); 764639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 765639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 7660a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright /** 7670a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * A ring buffer of ambient light measurements sorted by time. 7680a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * 7690a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * Each entry consists of a timestamp and a lux measurement, and the overall buffer is sorted 7700a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright * from oldest to newest. 7710a933141e2dd72bc868598cfa2146b2c72b85d5dMichael Wright */ 772103fb78ac1b91874f8b90cc5a165e6f0502179c4Michael Wright private static final class AmbientLightRingBuffer { 773639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Proportional extra capacity of the buffer beyond the expected number of light samples 774639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // in the horizon 775639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private static final float BUFFER_SLACK = 1.5f; 776639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private float[] mRingLux; 777639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private long[] mRingTime; 778639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mCapacity; 779639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 780639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // The first valid element and the next open slot. 781639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Note that if mCount is zero then there are no valid elements. 782639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mStart; 783639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mEnd; 784639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int mCount; 785639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 7866fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic public AmbientLightRingBuffer(long lightSensorRate, int ambientLightHorizon) { 7876fc42f549a6a67fe48e6e8e368dc2b164030d7c3Zoran Jovanovic mCapacity = (int) Math.ceil(ambientLightHorizon * BUFFER_SLACK / lightSensorRate); 788639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux = new float[mCapacity]; 789639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime = new long[mCapacity]; 790639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 791639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 792639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public float getLux(int index) { 793639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mRingLux[offsetOf(index)]; 794639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 795639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 796639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public long getTime(int index) { 797639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mRingTime[offsetOf(index)]; 798639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 799639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 800639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void push(long time, float lux) { 801639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int next = mEnd; 802639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mCount == mCapacity) { 803639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int newSize = mCapacity * 2; 804639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 805639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright float[] newRingLux = new float[newSize]; 806639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright long[] newRingTime = new long[newSize]; 807639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int length = mCapacity - mStart; 808639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingLux, mStart, newRingLux, 0, length); 809639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingTime, mStart, newRingTime, 0, length); 810639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mStart != 0) { 811639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingLux, 0, newRingLux, length, mStart); 812639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright System.arraycopy(mRingTime, 0, newRingTime, length, mStart); 813639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 814639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux = newRingLux; 815639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime = newRingTime; 816639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 817639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright next = mCapacity; 818639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCapacity = newSize; 819639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = 0; 820639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 821639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime[next] = time; 822639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingLux[next] = lux; 823639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = next + 1; 824639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mEnd == mCapacity) { 825639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = 0; 826639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 827639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount++; 828639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 829639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 830639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void prune(long horizon) { 831639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mCount == 0) { 832639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return; 833639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 834639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 835639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright while (mCount > 1) { 836639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright int next = mStart + 1; 837639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (next >= mCapacity) { 838639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright next -= mCapacity; 839639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 840639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mRingTime[next] > horizon) { 841639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // Some light sensors only produce data upon a change in the ambient light 842639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // levels, so we need to consider the previous measurement as the ambient light 843639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // level for all points in time up until we receive a new measurement. Thus, we 844639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // always want to keep the youngest element that would be removed from the 845639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // buffer and just set its measurement time to the horizon time since at that 846639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // point it is the ambient light level, and to remove it would be to drop a 847639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright // valid data point within our horizon. 848639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright break; 849639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 850639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = next; 851639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount -= 1; 852639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 853639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 854639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (mRingTime[mStart] < horizon) { 855639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mRingTime[mStart] = horizon; 856639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 857639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 858639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 859639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public int size() { 860639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return mCount; 861639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 862639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 863639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public void clear() { 864639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mStart = 0; 865639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mEnd = 0; 866639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright mCount = 0; 867639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 868639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 869639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright @Override 870639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright public String toString() { 871a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown StringBuffer buf = new StringBuffer(); 872a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append('['); 873a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown for (int i = 0; i < mCount; i++) { 874a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown final long next = i + 1 < mCount ? getTime(i + 1) : SystemClock.uptimeMillis(); 875a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown if (i != 0) { 876a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(", "); 877a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown } 878a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(getLux(i)); 879a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(" / "); 880a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(next - getTime(i)); 881a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append("ms"); 882639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 883a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown buf.append(']'); 884a576b4d3be8687f0a65fc5777424955d551604e4Jeff Brown return buf.toString(); 885639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 886639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright 887639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright private int offsetOf(int index) { 888639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (index >= mCount || index < 0) { 889639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright throw new ArrayIndexOutOfBoundsException(index); 890639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 891639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright index += mStart; 892639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright if (index >= mCapacity) { 893639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright index -= mCapacity; 894639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 895639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright return index; 896639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 897639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright } 898639c8becc6d0efe9c205f3abf1e9347464a95020Michael Wright} 899