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Merge "Customize auto-brightness parameters"

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This commit is contained in:
Michael Wright
2015-12-14 17:38:58 +00:00
committed by Gerrit Code Review
parent caf1972dee 6fc42f549a
commit a3931897fd
4 changed files with 44 additions and 23 deletions
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7
core/res/res/values/config.xml
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@@ -1002,6 +1002,10 @@
<!-- Light sensor event rate in milliseconds for automatic brightness control. -->
<integer name="config_autoBrightnessLightSensorRate">250</integer>
<!-- The maximum range of gamma adjustment possible using the screen
auto-brightness adjustment setting. -->
<fraction name="config_autoBrightnessAdjustmentMaxGamma">300%</fraction>
<!-- If we allow automatic adjustment of screen brightness while dozing, how many times we want
to reduce it to preserve the battery. Value of 100% means no scaling. -->
<fraction name="config_screenAutoBrightnessDozeScaleFactor">100%</fraction>
@@ -1019,6 +1023,9 @@
adapt to the environment. This mode may be better suited for watches. -->
<bool name="config_autoBrightnessResetAmbientLuxAfterWarmUp">true</bool>
<!-- Period of time in which to consider light samples in milliseconds. -->
<integer name="config_autoBrightnessAmbientLightHorizon">10000</integer>
<!-- Screen brightness used to dim the screen when the user activity
timeout expires. May be less than the minimum allowed brightness setting
that can be set by the user. -->

2
core/res/res/values/symbols.xml
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@@ -1689,6 +1689,8 @@
<java-symbol type="id" name="replace_message" />
<java-symbol type="fraction" name="config_dimBehindFadeDuration" />
<java-symbol type="fraction" name="config_screenAutoBrightnessDozeScaleFactor" />
<java-symbol type="fraction" name="config_autoBrightnessAdjustmentMaxGamma" />
<java-symbol type="integer" name="config_autoBrightnessAmbientLightHorizon"/>
<java-symbol type="integer" name="config_autoBrightnessBrighteningLightDebounce"/>
<java-symbol type="integer" name="config_autoBrightnessDarkeningLightDebounce"/>
<java-symbol type="integer" name="config_autoBrightnessLightSensorRate"/>

50
services/core/java/com/android/server/display/AutomaticBrightnessController.java
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@@ -49,23 +49,12 @@ class AutomaticBrightnessController {
// If true, enables the use of the screen auto-brightness adjustment setting.
private static final boolean USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT = true;
// The maximum range of gamma adjustment possible using the screen
// auto-brightness adjustment setting.
private static final float SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA = 3.0f;
// Period of time in which to consider light samples in milliseconds.
private static final int AMBIENT_LIGHT_HORIZON = 10000;
// Hysteresis constraints for brightening or darkening.
// The recent lux must have changed by at least this fraction relative to the
// current ambient lux before a change will be considered.
private static final float BRIGHTENING_LIGHT_HYSTERESIS = 0.10f;
private static final float DARKENING_LIGHT_HYSTERESIS = 0.20f;
// The intercept used for the weighting calculation. This is used in order to keep all possible
// weighting values positive.
private static final int WEIGHTING_INTERCEPT = AMBIENT_LIGHT_HORIZON;
// How long the current sensor reading is assumed to be valid beyond the current time.
// This provides a bit of prediction, as well as ensures that the weight for the last sample is
// non-zero, which in turn ensures that the total weight is non-zero.
@@ -132,6 +121,13 @@ class AutomaticBrightnessController {
// and only then decide whether to change brightness.
private final boolean mResetAmbientLuxAfterWarmUpConfig;
// Period of time in which to consider light samples in milliseconds.
private final int mAmbientLightHorizon;
// The intercept used for the weighting calculation. This is used in order to keep all possible
// weighting values positive.
private final int mWeightingIntercept;
// Amount of time to delay auto-brightness after screen on while waiting for
// the light sensor to warm-up in milliseconds.
// May be 0 if no warm-up is required.
@@ -179,6 +175,10 @@ class AutomaticBrightnessController {
// The screen auto-brightness adjustment factor in the range -1 (dimmer) to 1 (brighter)
private float mScreenAutoBrightnessAdjustment = 0.0f;
// The maximum range of gamma adjustment possible using the screen
// auto-brightness adjustment setting.
private float mScreenAutoBrightnessAdjustmentMaxGamma;
// The last screen auto-brightness gamma. (For printing in dump() only.)
private float mLastScreenAutoBrightnessGamma = 1.0f;
@@ -197,7 +197,8 @@ class AutomaticBrightnessController {
SensorManager sensorManager, Spline autoBrightnessSpline, int lightSensorWarmUpTime,
int brightnessMin, int brightnessMax, float dozeScaleFactor,
int lightSensorRate, long brighteningLightDebounceConfig,
long darkeningLightDebounceConfig, boolean resetAmbientLuxAfterWarmUpConfig) {
long darkeningLightDebounceConfig, boolean resetAmbientLuxAfterWarmUpConfig,
int ambientLightHorizon, float autoBrightnessAdjustmentMaxGamma ) {
mCallbacks = callbacks;
mTwilight = LocalServices.getService(TwilightManager.class);
mSensorManager = sensorManager;
@@ -210,9 +211,12 @@ class AutomaticBrightnessController {
mBrighteningLightDebounceConfig = brighteningLightDebounceConfig;
mDarkeningLightDebounceConfig = darkeningLightDebounceConfig;
mResetAmbientLuxAfterWarmUpConfig = resetAmbientLuxAfterWarmUpConfig;
mAmbientLightHorizon = ambientLightHorizon;
mWeightingIntercept = ambientLightHorizon;
mScreenAutoBrightnessAdjustmentMaxGamma = autoBrightnessAdjustmentMaxGamma;
mHandler = new AutomaticBrightnessHandler(looper);
mAmbientLightRingBuffer = new AmbientLightRingBuffer(mLightSensorRate);
mAmbientLightRingBuffer = new AmbientLightRingBuffer(mLightSensorRate, mAmbientLightHorizon);
if (!DEBUG_PRETEND_LIGHT_SENSOR_ABSENT) {
mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
@@ -266,6 +270,7 @@ class AutomaticBrightnessController {
pw.println(" mLightSensorEnabled=" + mLightSensorEnabled);
pw.println(" mLightSensorEnableTime=" + TimeUtils.formatUptime(mLightSensorEnableTime));
pw.println(" mAmbientLux=" + mAmbientLux);
pw.println(" mAmbientLightHorizon=" + mAmbientLightHorizon);
pw.println(" mBrighteningLuxThreshold=" + mBrighteningLuxThreshold);
pw.println(" mDarkeningLuxThreshold=" + mDarkeningLuxThreshold);
pw.println(" mLastObservedLux=" + mLastObservedLux);
@@ -274,6 +279,7 @@ class AutomaticBrightnessController {
pw.println(" mAmbientLightRingBuffer=" + mAmbientLightRingBuffer);
pw.println(" mScreenAutoBrightness=" + mScreenAutoBrightness);
pw.println(" mScreenAutoBrightnessAdjustment=" + mScreenAutoBrightnessAdjustment);
pw.println(" mScreenAutoBrightnessAdjustmentMaxGamma=" + mScreenAutoBrightnessAdjustmentMaxGamma);
pw.println(" mLastScreenAutoBrightnessGamma=" + mLastScreenAutoBrightnessGamma);
pw.println(" mDozing=" + mDozing);
}
@@ -309,7 +315,7 @@ class AutomaticBrightnessController {
private void applyLightSensorMeasurement(long time, float lux) {
mRecentLightSamples++;
mAmbientLightRingBuffer.prune(time - AMBIENT_LIGHT_HORIZON);
mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon);
mAmbientLightRingBuffer.push(time, lux);
// Remember this sample value.
@@ -360,14 +366,14 @@ class AutomaticBrightnessController {
return sum / totalWeight;
}
private static float calculateWeight(long startDelta, long endDelta) {
private float calculateWeight(long startDelta, long endDelta) {
return weightIntegral(endDelta) - weightIntegral(startDelta);
}
// Evaluates the integral of y = x + WEIGHTING_INTERCEPT. This is always positive for the
// Evaluates the integral of y = x + mWeightingIntercept. This is always positive for the
// horizon we're looking at and provides a non-linear weighting for light samples.
private static float weightIntegral(long x) {
return x * (x * 0.5f + WEIGHTING_INTERCEPT);
private float weightIntegral(long x) {
return x * (x * 0.5f + mWeightingIntercept);
}
private long nextAmbientLightBrighteningTransition(long time) {
@@ -396,7 +402,7 @@ class AutomaticBrightnessController {
private void updateAmbientLux() {
long time = SystemClock.uptimeMillis();
mAmbientLightRingBuffer.prune(time - AMBIENT_LIGHT_HORIZON);
mAmbientLightRingBuffer.prune(time - mAmbientLightHorizon);
updateAmbientLux(time);
}
@@ -470,7 +476,7 @@ class AutomaticBrightnessController {
if (USE_SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT
&& mScreenAutoBrightnessAdjustment != 0.0f) {
final float adjGamma = MathUtils.pow(SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA,
final float adjGamma = MathUtils.pow(mScreenAutoBrightnessAdjustmentMaxGamma,
Math.min(1.0f, Math.max(-1.0f, -mScreenAutoBrightnessAdjustment)));
gamma *= adjGamma;
if (DEBUG) {
@@ -653,8 +659,8 @@ class AutomaticBrightnessController {
private int mEnd;
private int mCount;
public AmbientLightRingBuffer(long lightSensorRate) {
mCapacity = (int) Math.ceil(AMBIENT_LIGHT_HORIZON * BUFFER_SLACK / lightSensorRate);
public AmbientLightRingBuffer(long lightSensorRate, int ambientLightHorizon) {
mCapacity = (int) Math.ceil(ambientLightHorizon * BUFFER_SLACK / lightSensorRate);
mRingLux = new float[mCapacity];
mRingTime = new long[mCapacity];
}

8
services/core/java/com/android/server/display/DisplayPowerController.java
View File

@@ -311,6 +311,11 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
com.android.internal.R.integer.config_autoBrightnessDarkeningLightDebounce);
boolean autoBrightnessResetAmbientLuxAfterWarmUp = resources.getBoolean(
com.android.internal.R.bool.config_autoBrightnessResetAmbientLuxAfterWarmUp);
int ambientLightHorizon = resources.getInteger(
com.android.internal.R.integer.config_autoBrightnessAmbientLightHorizon);
float autoBrightnessAdjustmentMaxGamma = resources.getFraction(
com.android.internal.R.fraction.config_autoBrightnessAdjustmentMaxGamma,
1, 1);
if (mUseSoftwareAutoBrightnessConfig) {
int[] lux = resources.getIntArray(
@@ -348,7 +353,8 @@ final class DisplayPowerController implements AutomaticBrightnessController.Call
lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum,
mScreenBrightnessRangeMaximum, dozeScaleFactor, lightSensorRate,
brighteningLightDebounce, darkeningLightDebounce,
autoBrightnessResetAmbientLuxAfterWarmUp);
autoBrightnessResetAmbientLuxAfterWarmUp,
ambientLightHorizon, autoBrightnessAdjustmentMaxGamma);
}
}