| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.display; |
| |
| import static android.text.TextUtils.formatSimple; |
| |
| import android.annotation.Nullable; |
| import android.content.pm.ApplicationInfo; |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.hardware.display.BrightnessConfiguration; |
| import android.hardware.display.BrightnessCorrection; |
| import android.os.PowerManager; |
| import android.util.MathUtils; |
| import android.util.Pair; |
| import android.util.Slog; |
| import android.util.Spline; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.display.BrightnessSynchronizer; |
| import com.android.internal.util.Preconditions; |
| import com.android.server.display.utils.Plog; |
| import com.android.server.display.whitebalance.DisplayWhiteBalanceController; |
| |
| import java.io.PrintWriter; |
| import java.util.Arrays; |
| import java.util.Locale; |
| import java.util.Objects; |
| |
| /** |
| * A utility to map from an ambient brightness to a display's "backlight" brightness based on the |
| * available display information and brightness configuration. |
| * |
| * Note that without a mapping from the nits to a display backlight level, any |
| * {@link BrightnessConfiguration}s that are set are just ignored. |
| */ |
| public abstract class BrightnessMappingStrategy { |
| private static final String TAG = "BrightnessMappingStrategy"; |
| |
| private static final float LUX_GRAD_SMOOTHING = 0.25f; |
| private static final float MAX_GRAD = 1.0f; |
| private static final float SHORT_TERM_MODEL_THRESHOLD_RATIO = 0.6f; |
| |
| // Constant that ensures that each step of the curve can increase by up to at least |
| // MIN_PERMISSABLE_INCREASE. Otherwise when the brightness is set to 0, the curve will never |
| // increase and will always be 0. |
| private static final float MIN_PERMISSABLE_INCREASE = 0.004f; |
| |
| protected boolean mLoggingEnabled; |
| |
| private static final Plog PLOG = Plog.createSystemPlog(TAG); |
| |
| /** |
| * Creates a BrightnessMappingStrategy for active (normal) mode. |
| * @param resources |
| * @param displayDeviceConfig |
| * @return the BrightnessMappingStrategy |
| */ |
| @Nullable |
| public static BrightnessMappingStrategy create(Resources resources, |
| DisplayDeviceConfig displayDeviceConfig, |
| DisplayWhiteBalanceController displayWhiteBalanceController) { |
| return create(resources, displayDeviceConfig, /* isForIdleMode= */ false, |
| displayWhiteBalanceController); |
| } |
| |
| /** |
| * Creates a BrightnessMappingStrategy for idle screen brightness mode. |
| * @param resources |
| * @param displayDeviceConfig |
| * @return the BrightnessMappingStrategy |
| */ |
| @Nullable |
| public static BrightnessMappingStrategy createForIdleMode(Resources resources, |
| DisplayDeviceConfig displayDeviceConfig, DisplayWhiteBalanceController |
| displayWhiteBalanceController) { |
| return create(resources, displayDeviceConfig, /* isForIdleMode= */ true, |
| displayWhiteBalanceController); |
| } |
| |
| /** |
| * Creates a BrightnessMapping strategy for either active or idle screen brightness mode. |
| * We do not create a simple mapping strategy for idle mode. |
| * |
| * @param resources |
| * @param displayDeviceConfig |
| * @param isForIdleMode determines whether the configurations loaded are for idle screen |
| * brightness mode or active screen brightness mode. |
| * @return the BrightnessMappingStrategy |
| */ |
| @Nullable |
| private static BrightnessMappingStrategy create(Resources resources, |
| DisplayDeviceConfig displayDeviceConfig, boolean isForIdleMode, |
| DisplayWhiteBalanceController displayWhiteBalanceController) { |
| |
| // Display independent, mode dependent values |
| float[] brightnessLevelsNits; |
| float[] luxLevels; |
| if (isForIdleMode) { |
| brightnessLevelsNits = getFloatArray(resources.obtainTypedArray( |
| com.android.internal.R.array.config_autoBrightnessDisplayValuesNitsIdle)); |
| luxLevels = getLuxLevels(resources.getIntArray( |
| com.android.internal.R.array.config_autoBrightnessLevelsIdle)); |
| } else { |
| brightnessLevelsNits = getFloatArray(resources.obtainTypedArray( |
| com.android.internal.R.array.config_autoBrightnessDisplayValuesNits)); |
| luxLevels = getLuxLevels(resources.getIntArray( |
| com.android.internal.R.array.config_autoBrightnessLevels)); |
| } |
| |
| // Display independent, mode independent values |
| int[] brightnessLevelsBacklight = resources.getIntArray( |
| com.android.internal.R.array.config_autoBrightnessLcdBacklightValues); |
| float autoBrightnessAdjustmentMaxGamma = resources.getFraction( |
| com.android.internal.R.fraction.config_autoBrightnessAdjustmentMaxGamma, |
| 1, 1); |
| long shortTermModelTimeout = resources.getInteger( |
| com.android.internal.R.integer.config_autoBrightnessShortTermModelTimeout); |
| |
| // Display dependent values - used for physical mapping strategy nits -> brightness |
| final float[] nitsRange = displayDeviceConfig.getNits(); |
| final float[] brightnessRange = displayDeviceConfig.getBrightness(); |
| |
| if (isValidMapping(nitsRange, brightnessRange) |
| && isValidMapping(luxLevels, brightnessLevelsNits)) { |
| |
| BrightnessConfiguration.Builder builder = new BrightnessConfiguration.Builder( |
| luxLevels, brightnessLevelsNits); |
| builder.setShortTermModelTimeoutMillis(shortTermModelTimeout); |
| builder.setShortTermModelLowerLuxMultiplier(SHORT_TERM_MODEL_THRESHOLD_RATIO); |
| builder.setShortTermModelUpperLuxMultiplier(SHORT_TERM_MODEL_THRESHOLD_RATIO); |
| return new PhysicalMappingStrategy(builder.build(), nitsRange, brightnessRange, |
| autoBrightnessAdjustmentMaxGamma, isForIdleMode, displayWhiteBalanceController); |
| } else if (isValidMapping(luxLevels, brightnessLevelsBacklight) && !isForIdleMode) { |
| return new SimpleMappingStrategy(luxLevels, brightnessLevelsBacklight, |
| autoBrightnessAdjustmentMaxGamma, shortTermModelTimeout); |
| } else { |
| return null; |
| } |
| } |
| |
| private static float[] getLuxLevels(int[] lux) { |
| // The first control point is implicit and always at 0 lux. |
| float[] levels = new float[lux.length + 1]; |
| for (int i = 0; i < lux.length; i++) { |
| levels[i + 1] = (float) lux[i]; |
| } |
| return levels; |
| } |
| |
| /** |
| * Extracts a float array from the specified {@link TypedArray}. |
| * |
| * @param array The array to convert. |
| * @return the given array as a float array. |
| */ |
| public static float[] getFloatArray(TypedArray array) { |
| final int N = array.length(); |
| float[] vals = new float[N]; |
| for (int i = 0; i < N; i++) { |
| vals[i] = array.getFloat(i, PowerManager.BRIGHTNESS_OFF_FLOAT); |
| } |
| array.recycle(); |
| return vals; |
| } |
| |
| private static boolean isValidMapping(float[] x, float[] y) { |
| if (x == null || y == null || x.length == 0 || y.length == 0) { |
| return false; |
| } |
| if (x.length != y.length) { |
| return false; |
| } |
| final int N = x.length; |
| float prevX = x[0]; |
| float prevY = y[0]; |
| if (prevX < 0 || prevY < 0 || Float.isNaN(prevX) || Float.isNaN(prevY)) { |
| return false; |
| } |
| for (int i = 1; i < N; i++) { |
| if (prevX >= x[i] || prevY > y[i]) { |
| return false; |
| } |
| if (Float.isNaN(x[i]) || Float.isNaN(y[i])) { |
| return false; |
| } |
| prevX = x[i]; |
| prevY = y[i]; |
| } |
| return true; |
| } |
| |
| private static boolean isValidMapping(float[] x, int[] y) { |
| if (x == null || y == null || x.length == 0 || y.length == 0) { |
| return false; |
| } |
| if (x.length != y.length) { |
| return false; |
| } |
| final int N = x.length; |
| float prevX = x[0]; |
| int prevY = y[0]; |
| if (prevX < 0 || prevY < 0 || Float.isNaN(prevX)) { |
| return false; |
| } |
| for (int i = 1; i < N; i++) { |
| if (prevX >= x[i] || prevY > y[i]) { |
| return false; |
| } |
| if (Float.isNaN(x[i])) { |
| return false; |
| } |
| prevX = x[i]; |
| prevY = y[i]; |
| } |
| return true; |
| } |
| |
| /** |
| * Enable/disable logging. |
| * |
| * @param loggingEnabled |
| * Whether logging should be on/off. |
| * |
| * @return Whether the method succeeded or not. |
| */ |
| public boolean setLoggingEnabled(boolean loggingEnabled) { |
| if (mLoggingEnabled == loggingEnabled) { |
| return false; |
| } |
| mLoggingEnabled = loggingEnabled; |
| return true; |
| } |
| |
| /** |
| * Sets the {@link BrightnessConfiguration}. |
| * |
| * @param config The new configuration. If {@code null} is passed, the default configuration is |
| * used. |
| * @return Whether the brightness configuration has changed. |
| */ |
| public abstract boolean setBrightnessConfiguration(@Nullable BrightnessConfiguration config); |
| |
| /** |
| * Gets the current {@link BrightnessConfiguration}. |
| */ |
| @Nullable |
| public abstract BrightnessConfiguration getBrightnessConfiguration(); |
| |
| /** |
| * Returns the desired brightness of the display based on the current ambient lux, including |
| * any context-related corrections. |
| * |
| * The returned brightness will be in the range [0, 1.0], where 1.0 is the display at max |
| * brightness and 0 is the display at minimum brightness. |
| * |
| * @param lux The current ambient brightness in lux. |
| * @param packageName the foreground app package name. |
| * @param category the foreground app package category. |
| * @return The desired brightness of the display normalized to the range [0, 1.0]. |
| */ |
| public abstract float getBrightness(float lux, String packageName, |
| @ApplicationInfo.Category int category); |
| |
| /** |
| * Returns the desired brightness of the display based on the current ambient lux. |
| * |
| * The returned brightness wil be in the range [0, 1.0], where 1.0 is the display at max |
| * brightness and 0 is the display at minimum brightness. |
| * |
| * @param lux The current ambient brightness in lux. |
| * |
| * @return The desired brightness of the display normalized to the range [0, 1.0]. |
| */ |
| public float getBrightness(float lux) { |
| return getBrightness(lux, null /* packageName */, ApplicationInfo.CATEGORY_UNDEFINED); |
| } |
| |
| /** |
| * Returns the current auto-brightness adjustment. |
| * |
| * The returned adjustment is a value in the range [-1.0, 1.0] such that |
| * {@code config_autoBrightnessAdjustmentMaxGamma<sup>-adjustment</sup>} is used to gamma |
| * correct the brightness curve. |
| */ |
| public abstract float getAutoBrightnessAdjustment(); |
| |
| /** |
| * Sets the auto-brightness adjustment. |
| * |
| * @param adjustment The desired auto-brightness adjustment. |
| * @return Whether the auto-brightness adjustment has changed. |
| * |
| * @Deprecated The auto-brightness adjustment should not be set directly, but rather inferred |
| * from user data points. |
| */ |
| public abstract boolean setAutoBrightnessAdjustment(float adjustment); |
| |
| /** |
| * Converts the provided brightness value to nits if possible. |
| * |
| * Returns -1.0f if there's no available mapping for the brightness to nits. |
| */ |
| public abstract float convertToNits(float brightness); |
| |
| /** |
| * Adds a user interaction data point to the brightness mapping. |
| * |
| * This data point <b>must</b> exist on the brightness curve as a result of this call. This is |
| * so that the next time we come to query what the screen brightness should be, we get what the |
| * user requested rather than immediately changing to some other value. |
| * |
| * Currently, we only keep track of one of these at a time to constrain what can happen to the |
| * curve. |
| */ |
| public abstract void addUserDataPoint(float lux, float brightness); |
| |
| /** |
| * Removes any short term adjustments made to the curve from user interactions. |
| * |
| * Note that this does *not* reset the mapping to its initial state, any brightness |
| * configurations that have been applied will continue to be in effect. This solely removes the |
| * effects of user interactions on the model. |
| */ |
| public abstract void clearUserDataPoints(); |
| |
| /** @return True if there are any short term adjustments applied to the curve. */ |
| public abstract boolean hasUserDataPoints(); |
| |
| /** @return True if the current brightness configuration is the default one. */ |
| public abstract boolean isDefaultConfig(); |
| |
| /** @return The default brightness configuration. */ |
| public abstract BrightnessConfiguration getDefaultConfig(); |
| |
| /** Recalculates the backlight-to-nits and nits-to-backlight splines. */ |
| public abstract void recalculateSplines(boolean applyAdjustment, float[] adjustment); |
| |
| /** |
| * Returns the timeout for the short term model |
| * |
| * Timeout after which we remove the effects any user interactions might've had on the |
| * brightness mapping. This timeout doesn't start until we transition to a non-interactive |
| * display policy so that we don't reset while users are using their devices, but also so that |
| * we don't erroneously keep the short-term model if the device is dozing but the |
| * display is fully on. |
| */ |
| public abstract long getShortTermModelTimeout(); |
| |
| /** |
| * Prints dump output for display dumpsys. |
| */ |
| public abstract void dump(PrintWriter pw, float hbmTransition); |
| |
| /** |
| * We can designate a mapping strategy to be used for idle screen brightness mode. |
| * @return whether this mapping strategy is to be used for idle screen brightness mode. |
| */ |
| public abstract boolean isForIdleMode(); |
| |
| /** |
| * Check if the short term model should be reset given the anchor lux the last |
| * brightness change was made at and the current ambient lux. |
| */ |
| public boolean shouldResetShortTermModel(float ambientLux, float shortTermModelAnchor) { |
| BrightnessConfiguration config = getBrightnessConfiguration(); |
| float minThresholdRatio = SHORT_TERM_MODEL_THRESHOLD_RATIO; |
| float maxThresholdRatio = SHORT_TERM_MODEL_THRESHOLD_RATIO; |
| if (config != null) { |
| if (!Float.isNaN(config.getShortTermModelLowerLuxMultiplier())) { |
| minThresholdRatio = config.getShortTermModelLowerLuxMultiplier(); |
| } |
| if (!Float.isNaN(config.getShortTermModelUpperLuxMultiplier())) { |
| maxThresholdRatio = config.getShortTermModelUpperLuxMultiplier(); |
| } |
| } |
| final float minAmbientLux = |
| shortTermModelAnchor - shortTermModelAnchor * minThresholdRatio; |
| final float maxAmbientLux = |
| shortTermModelAnchor + shortTermModelAnchor * maxThresholdRatio; |
| if (minAmbientLux < ambientLux && ambientLux <= maxAmbientLux) { |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "ShortTermModel: re-validate user data, ambient lux is " |
| + minAmbientLux + " < " + ambientLux + " < " + maxAmbientLux); |
| } |
| return false; |
| } else { |
| Slog.d(TAG, "ShortTermModel: reset data, ambient lux is " + ambientLux |
| + "(" + minAmbientLux + ", " + maxAmbientLux + ")"); |
| return true; |
| } |
| } |
| |
| // Normalize entire brightness range to 0 - 1. |
| protected static float normalizeAbsoluteBrightness(int brightness) { |
| return BrightnessSynchronizer.brightnessIntToFloat(brightness); |
| } |
| |
| private Pair<float[], float[]> insertControlPoint( |
| float[] luxLevels, float[] brightnessLevels, float lux, float brightness) { |
| final int idx = findInsertionPoint(luxLevels, lux); |
| final float[] newLuxLevels; |
| final float[] newBrightnessLevels; |
| if (idx == luxLevels.length) { |
| newLuxLevels = Arrays.copyOf(luxLevels, luxLevels.length + 1); |
| newBrightnessLevels = Arrays.copyOf(brightnessLevels, brightnessLevels.length + 1); |
| newLuxLevels[idx] = lux; |
| newBrightnessLevels[idx] = brightness; |
| } else if (luxLevels[idx] == lux) { |
| newLuxLevels = Arrays.copyOf(luxLevels, luxLevels.length); |
| newBrightnessLevels = Arrays.copyOf(brightnessLevels, brightnessLevels.length); |
| newBrightnessLevels[idx] = brightness; |
| } else { |
| newLuxLevels = Arrays.copyOf(luxLevels, luxLevels.length + 1); |
| System.arraycopy(newLuxLevels, idx, newLuxLevels, idx+1, luxLevels.length - idx); |
| newLuxLevels[idx] = lux; |
| newBrightnessLevels = Arrays.copyOf(brightnessLevels, brightnessLevels.length + 1); |
| System.arraycopy(newBrightnessLevels, idx, newBrightnessLevels, idx+1, |
| brightnessLevels.length - idx); |
| newBrightnessLevels[idx] = brightness; |
| } |
| smoothCurve(newLuxLevels, newBrightnessLevels, idx); |
| return Pair.create(newLuxLevels, newBrightnessLevels); |
| } |
| |
| /** |
| * Returns the index of the first value that's less than or equal to {@code val}. |
| * |
| * This assumes that {@code arr} is sorted. If all values in {@code arr} are greater |
| * than val, then it will return the length of arr as the insertion point. |
| */ |
| private int findInsertionPoint(float[] arr, float val) { |
| for (int i = 0; i < arr.length; i++) { |
| if (val <= arr[i]) { |
| return i; |
| } |
| } |
| return arr.length; |
| } |
| |
| private void smoothCurve(float[] lux, float[] brightness, int idx) { |
| if (mLoggingEnabled) { |
| PLOG.logCurve("unsmoothed curve", lux, brightness); |
| } |
| float prevLux = lux[idx]; |
| float prevBrightness = brightness[idx]; |
| // Smooth curve for data points above the newly introduced point |
| for (int i = idx+1; i < lux.length; i++) { |
| float currLux = lux[i]; |
| float currBrightness = brightness[i]; |
| float maxBrightness = MathUtils.max( |
| prevBrightness * permissibleRatio(currLux, prevLux), |
| prevBrightness + MIN_PERMISSABLE_INCREASE); |
| float newBrightness = MathUtils.constrain( |
| currBrightness, prevBrightness, maxBrightness); |
| if (newBrightness == currBrightness) { |
| break; |
| } |
| prevLux = currLux; |
| prevBrightness = newBrightness; |
| brightness[i] = newBrightness; |
| } |
| // Smooth curve for data points below the newly introduced point |
| prevLux = lux[idx]; |
| prevBrightness = brightness[idx]; |
| for (int i = idx-1; i >= 0; i--) { |
| float currLux = lux[i]; |
| float currBrightness = brightness[i]; |
| float minBrightness = prevBrightness * permissibleRatio(currLux, prevLux); |
| float newBrightness = MathUtils.constrain( |
| currBrightness, minBrightness, prevBrightness); |
| if (newBrightness == currBrightness) { |
| break; |
| } |
| prevLux = currLux; |
| prevBrightness = newBrightness; |
| brightness[i] = newBrightness; |
| } |
| if (mLoggingEnabled) { |
| PLOG.logCurve("smoothed curve", lux, brightness); |
| } |
| } |
| |
| private float permissibleRatio(float currLux, float prevLux) { |
| return MathUtils.pow((currLux + LUX_GRAD_SMOOTHING) |
| / (prevLux + LUX_GRAD_SMOOTHING), MAX_GRAD); |
| } |
| |
| protected float inferAutoBrightnessAdjustment(float maxGamma, float desiredBrightness, |
| float currentBrightness) { |
| float adjustment = 0; |
| float gamma = Float.NaN; |
| // Extreme edge cases: use a simpler heuristic, as proper gamma correction around the edges |
| // affects the curve rather drastically. |
| if (currentBrightness <= 0.1f || currentBrightness >= 0.9f) { |
| adjustment = (desiredBrightness - currentBrightness); |
| // Edge case: darkest adjustment possible. |
| } else if (desiredBrightness == 0) { |
| adjustment = -1; |
| // Edge case: brightest adjustment possible. |
| } else if (desiredBrightness == 1) { |
| adjustment = +1; |
| } else { |
| // current^gamma = desired => gamma = log[current](desired) |
| gamma = MathUtils.log(desiredBrightness) / MathUtils.log(currentBrightness); |
| // max^-adjustment = gamma => adjustment = -log[max](gamma) |
| adjustment = -MathUtils.log(gamma) / MathUtils.log(maxGamma); |
| } |
| adjustment = MathUtils.constrain(adjustment, -1, +1); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "inferAutoBrightnessAdjustment: " + maxGamma + "^" + -adjustment + "=" + |
| MathUtils.pow(maxGamma, -adjustment) + " == " + gamma); |
| Slog.d(TAG, "inferAutoBrightnessAdjustment: " + currentBrightness + "^" + gamma + "=" + |
| MathUtils.pow(currentBrightness, gamma) + " == " + desiredBrightness); |
| } |
| return adjustment; |
| } |
| |
| protected Pair<float[], float[]> getAdjustedCurve(float[] lux, float[] brightness, |
| float userLux, float userBrightness, float adjustment, float maxGamma) { |
| float[] newLux = lux; |
| float[] newBrightness = Arrays.copyOf(brightness, brightness.length); |
| if (mLoggingEnabled) { |
| PLOG.logCurve("unadjusted curve", newLux, newBrightness); |
| } |
| adjustment = MathUtils.constrain(adjustment, -1, 1); |
| float gamma = MathUtils.pow(maxGamma, -adjustment); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "getAdjustedCurve: " + maxGamma + "^" + -adjustment + "=" + |
| MathUtils.pow(maxGamma, -adjustment) + " == " + gamma); |
| } |
| if (gamma != 1) { |
| for (int i = 0; i < newBrightness.length; i++) { |
| newBrightness[i] = MathUtils.pow(newBrightness[i], gamma); |
| } |
| } |
| if (mLoggingEnabled) { |
| PLOG.logCurve("gamma adjusted curve", newLux, newBrightness); |
| } |
| if (userLux != -1) { |
| Pair<float[], float[]> curve = insertControlPoint(newLux, newBrightness, userLux, |
| userBrightness); |
| newLux = curve.first; |
| newBrightness = curve.second; |
| if (mLoggingEnabled) { |
| PLOG.logCurve("gamma and user adjusted curve", newLux, newBrightness); |
| // This is done for comparison. |
| curve = insertControlPoint(lux, brightness, userLux, userBrightness); |
| PLOG.logCurve("user adjusted curve", curve.first ,curve.second); |
| } |
| } |
| return Pair.create(newLux, newBrightness); |
| } |
| |
| /** |
| * A {@link BrightnessMappingStrategy} that maps from ambient room brightness directly to the |
| * backlight of the display. |
| * |
| * Since we don't have information about the display's physical brightness, any brightness |
| * configurations that are set are just ignored. |
| */ |
| private static class SimpleMappingStrategy extends BrightnessMappingStrategy { |
| // Lux control points |
| private final float[] mLux; |
| // Brightness control points normalized to [0, 1] |
| private final float[] mBrightness; |
| |
| private Spline mSpline; |
| private float mMaxGamma; |
| private float mAutoBrightnessAdjustment; |
| private float mUserLux; |
| private float mUserBrightness; |
| private long mShortTermModelTimeout; |
| |
| private SimpleMappingStrategy(float[] lux, int[] brightness, float maxGamma, |
| long timeout) { |
| Preconditions.checkArgument(lux.length != 0 && brightness.length != 0, |
| "Lux and brightness arrays must not be empty!"); |
| Preconditions.checkArgument(lux.length == brightness.length, |
| "Lux and brightness arrays must be the same length!"); |
| Preconditions.checkArrayElementsInRange(lux, 0, Float.MAX_VALUE, "lux"); |
| Preconditions.checkArrayElementsInRange(brightness, |
| 0, Integer.MAX_VALUE, "brightness"); |
| |
| final int N = brightness.length; |
| mLux = new float[N]; |
| mBrightness = new float[N]; |
| for (int i = 0; i < N; i++) { |
| mLux[i] = lux[i]; |
| mBrightness[i] = normalizeAbsoluteBrightness(brightness[i]); |
| } |
| |
| mMaxGamma = maxGamma; |
| mAutoBrightnessAdjustment = 0; |
| mUserLux = -1; |
| mUserBrightness = -1; |
| if (mLoggingEnabled) { |
| PLOG.start("simple mapping strategy"); |
| } |
| computeSpline(); |
| mShortTermModelTimeout = timeout; |
| } |
| |
| @Override |
| public long getShortTermModelTimeout() { |
| return mShortTermModelTimeout; |
| } |
| |
| @Override |
| public boolean setBrightnessConfiguration(@Nullable BrightnessConfiguration config) { |
| return false; |
| } |
| |
| @Override |
| public BrightnessConfiguration getBrightnessConfiguration() { |
| return null; |
| } |
| |
| @Override |
| public float getBrightness(float lux, String packageName, |
| @ApplicationInfo.Category int category) { |
| return mSpline.interpolate(lux); |
| } |
| |
| @Override |
| public float getAutoBrightnessAdjustment() { |
| return mAutoBrightnessAdjustment; |
| } |
| |
| @Override |
| public boolean setAutoBrightnessAdjustment(float adjustment) { |
| adjustment = MathUtils.constrain(adjustment, -1, 1); |
| if (adjustment == mAutoBrightnessAdjustment) { |
| return false; |
| } |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "setAutoBrightnessAdjustment: " + mAutoBrightnessAdjustment + " => " + |
| adjustment); |
| PLOG.start("auto-brightness adjustment"); |
| } |
| mAutoBrightnessAdjustment = adjustment; |
| computeSpline(); |
| return true; |
| } |
| |
| @Override |
| public float convertToNits(float brightness) { |
| return -1.0f; |
| } |
| |
| @Override |
| public void addUserDataPoint(float lux, float brightness) { |
| float unadjustedBrightness = getUnadjustedBrightness(lux); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "addUserDataPoint: (" + lux + "," + brightness + ")"); |
| PLOG.start("add user data point") |
| .logPoint("user data point", lux, brightness) |
| .logPoint("current brightness", lux, unadjustedBrightness); |
| } |
| float adjustment = inferAutoBrightnessAdjustment(mMaxGamma, |
| brightness /* desiredBrightness */, |
| unadjustedBrightness /* currentBrightness */); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "addUserDataPoint: " + mAutoBrightnessAdjustment + " => " + |
| adjustment); |
| } |
| mAutoBrightnessAdjustment = adjustment; |
| mUserLux = lux; |
| mUserBrightness = brightness; |
| computeSpline(); |
| } |
| |
| @Override |
| public void clearUserDataPoints() { |
| if (mUserLux != -1) { |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "clearUserDataPoints: " + mAutoBrightnessAdjustment + " => 0"); |
| PLOG.start("clear user data points") |
| .logPoint("user data point", mUserLux, mUserBrightness); |
| } |
| mAutoBrightnessAdjustment = 0; |
| mUserLux = -1; |
| mUserBrightness = -1; |
| computeSpline(); |
| } |
| } |
| |
| @Override |
| public boolean hasUserDataPoints() { |
| return mUserLux != -1; |
| } |
| |
| @Override |
| public boolean isDefaultConfig() { |
| return true; |
| } |
| |
| @Override |
| public BrightnessConfiguration getDefaultConfig() { |
| return null; |
| } |
| |
| @Override |
| public void recalculateSplines(boolean applyAdjustment, float[] adjustment) { |
| // Do nothing. |
| } |
| |
| @Override |
| public void dump(PrintWriter pw, float hbmTransition) { |
| pw.println("SimpleMappingStrategy"); |
| pw.println(" mSpline=" + mSpline); |
| pw.println(" mMaxGamma=" + mMaxGamma); |
| pw.println(" mAutoBrightnessAdjustment=" + mAutoBrightnessAdjustment); |
| pw.println(" mUserLux=" + mUserLux); |
| pw.println(" mUserBrightness=" + mUserBrightness); |
| } |
| |
| @Override |
| public boolean isForIdleMode() { |
| return false; |
| } |
| |
| private void computeSpline() { |
| Pair<float[], float[]> curve = getAdjustedCurve(mLux, mBrightness, mUserLux, |
| mUserBrightness, mAutoBrightnessAdjustment, mMaxGamma); |
| mSpline = Spline.createSpline(curve.first, curve.second); |
| } |
| |
| private float getUnadjustedBrightness(float lux) { |
| Spline spline = Spline.createSpline(mLux, mBrightness); |
| return spline.interpolate(lux); |
| } |
| } |
| |
| /** A {@link BrightnessMappingStrategy} that maps from ambient room brightness to the physical |
| * range of the display, rather than to the range of the backlight control (typically 0-255). |
| * |
| * By mapping through the physical brightness, the curve becomes portable across devices and |
| * gives us more resolution in the resulting mapping. |
| */ |
| @VisibleForTesting |
| static class PhysicalMappingStrategy extends BrightnessMappingStrategy { |
| // The current brightness configuration. |
| private BrightnessConfiguration mConfig; |
| |
| // A spline mapping from the current ambient light in lux to the desired display brightness |
| // in nits. |
| private Spline mBrightnessSpline; |
| |
| // A spline mapping from nits to the corresponding brightness value, normalized to the range |
| // [0, 1.0]. |
| private Spline mNitsToBrightnessSpline; |
| |
| // A spline mapping from the system brightness value, normalized to the range [0, 1.0], to |
| // a brightness in nits. |
| private Spline mBrightnessToNitsSpline; |
| |
| // The default brightness configuration. |
| private final BrightnessConfiguration mDefaultConfig; |
| |
| private final float[] mNits; |
| private final float[] mBrightness; |
| |
| private boolean mBrightnessRangeAdjustmentApplied; |
| |
| private final float mMaxGamma; |
| private float mAutoBrightnessAdjustment; |
| private float mUserLux; |
| private float mUserBrightness; |
| private final boolean mIsForIdleMode; |
| private final DisplayWhiteBalanceController mDisplayWhiteBalanceController; |
| |
| public PhysicalMappingStrategy(BrightnessConfiguration config, float[] nits, |
| float[] brightness, float maxGamma, boolean isForIdleMode, |
| DisplayWhiteBalanceController displayWhiteBalanceController) { |
| |
| Preconditions.checkArgument(nits.length != 0 && brightness.length != 0, |
| "Nits and brightness arrays must not be empty!"); |
| |
| Preconditions.checkArgument(nits.length == brightness.length, |
| "Nits and brightness arrays must be the same length!"); |
| Objects.requireNonNull(config); |
| Preconditions.checkArrayElementsInRange(nits, 0, Float.MAX_VALUE, "nits"); |
| Preconditions.checkArrayElementsInRange(brightness, |
| PowerManager.BRIGHTNESS_MIN, PowerManager.BRIGHTNESS_MAX, "brightness"); |
| |
| mIsForIdleMode = isForIdleMode; |
| mMaxGamma = maxGamma; |
| mAutoBrightnessAdjustment = 0; |
| mUserLux = -1; |
| mUserBrightness = -1; |
| mDisplayWhiteBalanceController = displayWhiteBalanceController; |
| |
| mNits = nits; |
| mBrightness = brightness; |
| computeNitsBrightnessSplines(mNits); |
| |
| mDefaultConfig = config; |
| if (mLoggingEnabled) { |
| PLOG.start("physical mapping strategy"); |
| } |
| mConfig = config; |
| computeSpline(); |
| } |
| |
| @Override |
| public long getShortTermModelTimeout() { |
| if (mConfig.getShortTermModelTimeoutMillis() >= 0) { |
| return mConfig.getShortTermModelTimeoutMillis(); |
| } else { |
| return mDefaultConfig.getShortTermModelTimeoutMillis(); |
| } |
| } |
| |
| @Override |
| public boolean setBrightnessConfiguration(@Nullable BrightnessConfiguration config) { |
| if (config == null) { |
| config = mDefaultConfig; |
| } |
| if (config.equals(mConfig)) { |
| return false; |
| } |
| if (mLoggingEnabled) { |
| PLOG.start("brightness configuration"); |
| } |
| mConfig = config; |
| computeSpline(); |
| return true; |
| } |
| |
| @Override |
| public BrightnessConfiguration getBrightnessConfiguration() { |
| return mConfig; |
| } |
| |
| @Override |
| public float getBrightness(float lux, String packageName, |
| @ApplicationInfo.Category int category) { |
| float nits = mBrightnessSpline.interpolate(lux); |
| |
| // Adjust nits to compensate for display white balance colour strength. |
| if (mDisplayWhiteBalanceController != null) { |
| nits = mDisplayWhiteBalanceController.calculateAdjustedBrightnessNits(nits); |
| } |
| |
| float brightness = mNitsToBrightnessSpline.interpolate(nits); |
| // Correct the brightness according to the current application and its category, but |
| // only if no user data point is set (as this will override the user setting). |
| if (mUserLux == -1) { |
| brightness = correctBrightness(brightness, packageName, category); |
| } else if (mLoggingEnabled) { |
| Slog.d(TAG, "user point set, correction not applied"); |
| } |
| return brightness; |
| } |
| |
| @Override |
| public float getAutoBrightnessAdjustment() { |
| return mAutoBrightnessAdjustment; |
| } |
| |
| @Override |
| public boolean setAutoBrightnessAdjustment(float adjustment) { |
| adjustment = MathUtils.constrain(adjustment, -1, 1); |
| if (adjustment == mAutoBrightnessAdjustment) { |
| return false; |
| } |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "setAutoBrightnessAdjustment: " + mAutoBrightnessAdjustment + " => " + |
| adjustment); |
| PLOG.start("auto-brightness adjustment"); |
| } |
| mAutoBrightnessAdjustment = adjustment; |
| computeSpline(); |
| return true; |
| } |
| |
| @Override |
| public float convertToNits(float brightness) { |
| return mBrightnessToNitsSpline.interpolate(brightness); |
| } |
| |
| @Override |
| public void addUserDataPoint(float lux, float brightness) { |
| float unadjustedBrightness = getUnadjustedBrightness(lux); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "addUserDataPoint: (" + lux + "," + brightness + ")"); |
| PLOG.start("add user data point") |
| .logPoint("user data point", lux, brightness) |
| .logPoint("current brightness", lux, unadjustedBrightness); |
| } |
| float adjustment = inferAutoBrightnessAdjustment(mMaxGamma, |
| brightness /* desiredBrightness */, |
| unadjustedBrightness /* currentBrightness */); |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "addUserDataPoint: " + mAutoBrightnessAdjustment + " => " + |
| adjustment); |
| } |
| mAutoBrightnessAdjustment = adjustment; |
| mUserLux = lux; |
| mUserBrightness = brightness; |
| computeSpline(); |
| } |
| |
| @Override |
| public void clearUserDataPoints() { |
| if (mUserLux != -1) { |
| if (mLoggingEnabled) { |
| Slog.d(TAG, "clearUserDataPoints: " + mAutoBrightnessAdjustment + " => 0"); |
| PLOG.start("clear user data points") |
| .logPoint("user data point", mUserLux, mUserBrightness); |
| } |
| mAutoBrightnessAdjustment = 0; |
| mUserLux = -1; |
| mUserBrightness = -1; |
| computeSpline(); |
| } |
| } |
| |
| @Override |
| public boolean hasUserDataPoints() { |
| return mUserLux != -1; |
| } |
| |
| @Override |
| public boolean isDefaultConfig() { |
| return mDefaultConfig.equals(mConfig); |
| } |
| |
| @Override |
| public BrightnessConfiguration getDefaultConfig() { |
| return mDefaultConfig; |
| } |
| |
| @Override |
| public void recalculateSplines(boolean applyAdjustment, float[] adjustedNits) { |
| mBrightnessRangeAdjustmentApplied = applyAdjustment; |
| computeNitsBrightnessSplines(mBrightnessRangeAdjustmentApplied ? adjustedNits : mNits); |
| } |
| |
| @Override |
| public void dump(PrintWriter pw, float hbmTransition) { |
| pw.println("PhysicalMappingStrategy"); |
| pw.println(" mConfig=" + mConfig); |
| pw.println(" mBrightnessSpline=" + mBrightnessSpline); |
| pw.println(" mNitsToBrightnessSpline=" + mNitsToBrightnessSpline); |
| pw.println(" mBrightnessToNitsSpline=" + mBrightnessToNitsSpline); |
| pw.println(" mMaxGamma=" + mMaxGamma); |
| pw.println(" mAutoBrightnessAdjustment=" + mAutoBrightnessAdjustment); |
| pw.println(" mUserLux=" + mUserLux); |
| pw.println(" mUserBrightness=" + mUserBrightness); |
| pw.println(" mDefaultConfig=" + mDefaultConfig); |
| pw.println(" mBrightnessRangeAdjustmentApplied=" + mBrightnessRangeAdjustmentApplied); |
| |
| dumpConfigDiff(pw, hbmTransition); |
| } |
| |
| @Override |
| public boolean isForIdleMode() { |
| return mIsForIdleMode; |
| } |
| |
| /** |
| * Prints out the default curve and how it differs from the long-term curve |
| * and the current curve (in case the current curve includes short-term adjustments). |
| * |
| * @param pw The print-writer to write to. |
| */ |
| private void dumpConfigDiff(PrintWriter pw, float hbmTransition) { |
| pw.println(" Difference between current config and default: "); |
| |
| Pair<float[], float[]> currentCurve = mConfig.getCurve(); |
| Spline currSpline = Spline.createSpline(currentCurve.first, currentCurve.second); |
| |
| Pair<float[], float[]> defaultCurve = mDefaultConfig.getCurve(); |
| Spline defaultSpline = Spline.createSpline(defaultCurve.first, defaultCurve.second); |
| |
| // Add the short-term curve lux point if present |
| float[] luxes = currentCurve.first; |
| if (mUserLux >= 0) { |
| luxes = Arrays.copyOf(currentCurve.first, currentCurve.first.length + 1); |
| luxes[luxes.length - 1] = mUserLux; |
| Arrays.sort(luxes); |
| } |
| |
| StringBuilder sbLux = null; |
| StringBuilder sbNits = null; |
| StringBuilder sbLong = null; |
| StringBuilder sbShort = null; |
| StringBuilder sbBrightness = null; |
| StringBuilder sbPercent = null; |
| StringBuilder sbPercentHbm = null; |
| boolean needsHeaders = true; |
| String separator = ""; |
| for (int i = 0; i < luxes.length; i++) { |
| float lux = luxes[i]; |
| if (needsHeaders) { |
| sbLux = new StringBuilder(" lux: "); |
| sbNits = new StringBuilder(" default: "); |
| sbLong = new StringBuilder(" long-term: "); |
| sbShort = new StringBuilder(" current: "); |
| sbBrightness = new StringBuilder(" current(bl): "); |
| sbPercent = new StringBuilder(" current(%): "); |
| sbPercentHbm = new StringBuilder(" current(hbm%): "); |
| needsHeaders = false; |
| } |
| |
| float defaultNits = defaultSpline.interpolate(lux); |
| float longTermNits = currSpline.interpolate(lux); |
| float shortTermNits = mBrightnessSpline.interpolate(lux); |
| float brightness = mNitsToBrightnessSpline.interpolate(shortTermNits); |
| |
| String luxPrefix = (lux == mUserLux ? "^" : ""); |
| String strLux = luxPrefix + toStrFloatForDump(lux); |
| String strNits = toStrFloatForDump(defaultNits); |
| String strLong = toStrFloatForDump(longTermNits); |
| String strShort = toStrFloatForDump(shortTermNits); |
| String strBrightness = toStrFloatForDump(brightness); |
| String strPercent = String.valueOf( |
| Math.round(100.0f * BrightnessUtils.convertLinearToGamma( |
| (brightness / hbmTransition)))); |
| String strPercentHbm = String.valueOf( |
| Math.round(100.0f * BrightnessUtils.convertLinearToGamma(brightness))); |
| |
| int maxLen = Math.max(strLux.length(), |
| Math.max(strNits.length(), |
| Math.max(strBrightness.length(), |
| Math.max(strPercent.length(), |
| Math.max(strPercentHbm.length(), |
| Math.max(strLong.length(), strShort.length())))))); |
| String format = separator + "%" + maxLen + "s"; |
| separator = ", "; |
| |
| sbLux.append(formatSimple(format, strLux)); |
| sbNits.append(formatSimple(format, strNits)); |
| sbLong.append(formatSimple(format, strLong)); |
| sbShort.append(formatSimple(format, strShort)); |
| sbBrightness.append(formatSimple(format, strBrightness)); |
| sbPercent.append(formatSimple(format, strPercent)); |
| sbPercentHbm.append(formatSimple(format, strPercentHbm)); |
| |
| // At 80 chars, start another row |
| if (sbLux.length() > 80 || (i == luxes.length - 1)) { |
| pw.println(sbLux); |
| pw.println(sbNits); |
| pw.println(sbLong); |
| pw.println(sbShort); |
| pw.println(sbBrightness); |
| pw.println(sbPercent); |
| if (hbmTransition < PowerManager.BRIGHTNESS_MAX) { |
| pw.println(sbPercentHbm); |
| } |
| pw.println(""); |
| needsHeaders = true; |
| separator = ""; |
| } |
| } |
| } |
| |
| private String toStrFloatForDump(float value) { |
| if (value == 0.0f) { |
| return "0"; |
| } else if (value < 0.1f) { |
| return String.format(Locale.US, "%.3f", value); |
| } else if (value < 1) { |
| return String.format(Locale.US, "%.2f", value); |
| } else if (value < 10) { |
| return String.format(Locale.US, "%.1f", value); |
| } else { |
| return formatSimple("%d", Math.round(value)); |
| } |
| } |
| |
| private void computeNitsBrightnessSplines(float[] nits) { |
| mNitsToBrightnessSpline = Spline.createSpline(nits, mBrightness); |
| mBrightnessToNitsSpline = Spline.createSpline(mBrightness, nits); |
| } |
| |
| private void computeSpline() { |
| Pair<float[], float[]> defaultCurve = mConfig.getCurve(); |
| float[] defaultLux = defaultCurve.first; |
| float[] defaultNits = defaultCurve.second; |
| float[] defaultBrightness = new float[defaultNits.length]; |
| for (int i = 0; i < defaultBrightness.length; i++) { |
| defaultBrightness[i] = mNitsToBrightnessSpline.interpolate(defaultNits[i]); |
| } |
| Pair<float[], float[]> curve = getAdjustedCurve(defaultLux, defaultBrightness, mUserLux, |
| mUserBrightness, mAutoBrightnessAdjustment, mMaxGamma); |
| float[] lux = curve.first; |
| float[] brightness = curve.second; |
| float[] nits = new float[brightness.length]; |
| for (int i = 0; i < nits.length; i++) { |
| nits[i] = mBrightnessToNitsSpline.interpolate(brightness[i]); |
| } |
| mBrightnessSpline = Spline.createSpline(lux, nits); |
| } |
| |
| private float getUnadjustedBrightness(float lux) { |
| Pair<float[], float[]> curve = mConfig.getCurve(); |
| Spline spline = Spline.createSpline(curve.first, curve.second); |
| return mNitsToBrightnessSpline.interpolate(spline.interpolate(lux)); |
| } |
| |
| private float correctBrightness(float brightness, String packageName, int category) { |
| if (packageName != null) { |
| BrightnessCorrection correction = mConfig.getCorrectionByPackageName(packageName); |
| if (correction != null) { |
| return correction.apply(brightness); |
| } |
| } |
| if (category != ApplicationInfo.CATEGORY_UNDEFINED) { |
| BrightnessCorrection correction = mConfig.getCorrectionByCategory(category); |
| if (correction != null) { |
| return correction.apply(brightness); |
| } |
| } |
| return brightness; |
| } |
| } |
| } |
