Merge "Update night display intensity coefficients" (5d79860c) · Commits · e / os / android_frameworks_base

core/res/res/values/config.xml

+12 −0

Original line number	Diff line number	Diff line
		@@ -893,6 +893,18 @@
		<!-- Maximum color temperature, in Kelvin, supported by Night display. -->
		<integer name="config_nightDisplayColorTemperatureMax">4082</integer>

		<string-array name="config_nightDisplayColorTemperatureCoefficients">
		<!-- R a-coefficient --> <item>0.0</item>
		<!-- R b-coefficient --> <item>0.0</item>
		<!-- R y-intercept --> <item>1.0</item>
		<!-- G a-coefficient --> <item>-0.00000000962353339</item>
		<!-- G b-coefficient --> <item>0.000153045476</item>
		<!-- G y-intercept --> <item>0.390782778</item>
		<!-- B a-coefficient --> <item>-0.0000000189359041</item>
		<!-- B b-coefficient --> <item>0.000302412211</item>
		<!-- B y-intercept --> <item>-0.198650895</item>
		</string-array>

		<!-- Indicate whether to allow the device to suspend when the screen is off
		due to the proximity sensor. This resource should only be set to true
		if the sensor HAL correctly handles the proximity sensor as a wake-up source.

core/res/res/values/symbols.xml

+1 −0

Original line number	Diff line number	Diff line
		@@ -2820,6 +2820,7 @@
		<java-symbol type="integer" name="config_nightDisplayColorTemperatureDefault" />
		<java-symbol type="integer" name="config_nightDisplayColorTemperatureMin" />
		<java-symbol type="integer" name="config_nightDisplayColorTemperatureMax" />
		<java-symbol type="array" name="config_nightDisplayColorTemperatureCoefficients" />

		<!-- Default first user restrictions -->
		<java-symbol type="array" name="config_defaultFirstUserRestrictions" />

services/core/java/com/android/server/display/NightDisplayService.java

+12 −22

Original line number	Diff line number	Diff line
		@@ -110,23 +110,7 @@ public final class NightDisplayService extends SystemService

		private float[] mMatrixNight = new float[16];

		/**
		* These coefficients were generated by an LLS quadratic regression fitted to the
		* overdetermined system based on experimental readings (and subsequent conversion from xy
		* chromaticity coordinates to gamma-corrected RGB values): { (temperature, R, G, B) } ->
		* { (7304, 1.0, 1.0, 1.0), (4082, 1.0, 0.857, 0.719), (2850, 1.0, .754, .516),
		* (2596, 1.0, 0.722, 0.454) }. The 3x3 matrix is formatted like so:
		* <table>
		* <tr><td>R: a coefficient</td><td>G: a coefficient</td><td>B: a coefficient</td></tr>
		* <tr><td>R: b coefficient</td><td>G: b coefficient</td><td>B: b coefficient</td></tr>
		* <tr><td>R: y-intercept</td><td>G: y-intercept</td><td>B: y-intercept</td></tr>
		* </table>
		*/
		private static final float[] mColorTempCoefficients = new float[] {
		0.0f, -0.00000000962353339f, -0.0000000189359041f,
		0.0f, 0.000153045476f, 0.000302412211f,
		1.0f, 0.390782778f, -0.198650895f
		};
		private final float[] mColorTempCoefficients = new float[9];

		private int mCurrentUser = UserHandle.USER_NULL;
		private ContentObserver mUserSetupObserver;
		@@ -140,6 +124,12 @@ public final class NightDisplayService extends SystemService
		public NightDisplayService(Context context) {
		super(context);
		mHandler = new Handler(Looper.getMainLooper());

		final String[] coefficients = context.getResources().getStringArray(
		com.android.internal.R.array.config_nightDisplayColorTemperatureCoefficients);
		for (int i = 0; i < 9 && i < coefficients.length; i++) {
		mColorTempCoefficients[i] = Float.parseFloat(coefficients[i]);
		}
		}

		@Override
		@@ -414,11 +404,11 @@ public final class NightDisplayService extends SystemService

		final float squareTemperature = colorTemperature * colorTemperature;
		final float red = squareTemperature * mColorTempCoefficients[0]
		+ colorTemperature * mColorTempCoefficients[3] + mColorTempCoefficients[6];
		final float green = squareTemperature * mColorTempCoefficients[1]
		+ colorTemperature * mColorTempCoefficients[4] + mColorTempCoefficients[7];
		final float blue = squareTemperature * mColorTempCoefficients[2]
		+ colorTemperature * mColorTempCoefficients[5] + mColorTempCoefficients[8];
		+ colorTemperature * mColorTempCoefficients[1] + mColorTempCoefficients[2];
		final float green = squareTemperature * mColorTempCoefficients[3]
		+ colorTemperature * mColorTempCoefficients[4] + mColorTempCoefficients[5];
		final float blue = squareTemperature * mColorTempCoefficients[6]
		+ colorTemperature * mColorTempCoefficients[7] + mColorTempCoefficients[8];
		outTemp[0] = red;
		outTemp[5] = green;
		outTemp[10] = blue;