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Merge "Fix comments in DisplayWhiteBalanceController"

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TreeHugger Robot
2019-09-26 20:14:49 +00:00
committed by Android (Google) Code Review
parent 2ee7cf7386 54d2d76ad7
commit e2415eeea0
1 changed files with 14 additions and 6 deletions
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20
services/core/java/com/android/server/display/whitebalance/DisplayWhiteBalanceController.java
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@@ -64,7 +64,13 @@ public class DisplayWhiteBalanceController implements
AmbientFilter mColorTemperatureFilter;
private DisplayWhiteBalanceThrottler mThrottler;
// In low brightness conditions the ALS readings are more noisy and produce
// high errors. This default is introduced to provide a fixed display color
// temperature when sensor readings become unreliable.
private final float mLowLightAmbientColorTemperature;
// In high brightness conditions certain color temperatures can cause peak display
// brightness to drop. This fixed color temperature can be used to compensate for
// this effect.
private final float mHighLightAmbientColorTemperature;
private float mAmbientColorTemperature;
@@ -85,12 +91,14 @@ public class DisplayWhiteBalanceController implements
// A piecewise linear relationship between ambient and display color temperatures.
private Spline.LinearSpline mAmbientToDisplayColorTemperatureSpline;
// In very low or very high brightness conditions ambient EQ should to set to a default
// instead of using mAmbientToDisplayColorTemperatureSpline. However, setting ambient EQ
// based on thresholds can cause the display to rapidly change color temperature. To solve
// this, mLowLightAmbientBrightnessToBiasSpline and mHighLightAmbientBrightnessToBiasSpline
// are used to smoothly interpolate from ambient color temperature to the defaults.
// A piecewise linear relationship between low light brightness and low light bias.
// In very low or very high brightness conditions Display White Balance should
// be to set to a default instead of using mAmbientToDisplayColorTemperatureSpline.
// However, setting Display White Balance based on thresholds can cause the
// display to rapidly change color temperature. To solve this,
// mLowLightAmbientBrightnessToBiasSpline and
// mHighLightAmbientBrightnessToBiasSpline are used to smoothly interpolate from
// ambient color temperature to the defaults. A piecewise linear relationship
// between low light brightness and low light bias.
private Spline.LinearSpline mLowLightAmbientBrightnessToBiasSpline;
// A piecewise linear relationship between high light brightness and high light bias.