Compute DWB compensation for luminance drop (1110de33) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/display/color/ColorDisplayService.java

+6 −1

Original line number	Diff line number	Diff line
		@@ -1453,7 +1453,7 @@ public final class ColorDisplayService extends SystemService {
		/**
		* Local service that allows color transforms to be enabled from other system services.
		*/
		public final class ColorDisplayServiceInternal {
		public class ColorDisplayServiceInternal {

		/**
		* Set the current CCT value for the display white balance transform, and if the transform
		@@ -1472,6 +1472,11 @@ public final class ColorDisplayService extends SystemService {
		return false;
		}

		/** Get the luminance of the current chromatic adaptation matrix. */
		public float getDisplayWhiteBalanceLuminance() {
		return mDisplayWhiteBalanceTintController.getLuminance();
		}

		/**
		* Reset the CCT value for the display white balance transform to its default value.
		*/

services/core/java/com/android/server/display/color/DisplayWhiteBalanceTintController.java

+12 −0

Original line number	Diff line number	Diff line
		@@ -251,6 +251,18 @@ final class DisplayWhiteBalanceTintController extends TintController {
		}
		}

		public float getLuminance() {
		synchronized (mLock) {
		if (mChromaticAdaptationMatrix != null && mChromaticAdaptationMatrix.length == 9) {
		// Compute only the luminance (y) value of the xyz * [1 1 1] transform.
		return 1 / (mChromaticAdaptationMatrix[1] + mChromaticAdaptationMatrix[4]
		+ mChromaticAdaptationMatrix[7]);
		} else {
		return -1;
		}
		}
		}

		private ColorSpace.Rgb makeRgbColorSpaceFromXYZ(float[] redGreenBlueXYZ, float[] whiteXYZ) {
		return new ColorSpace.Rgb(
		"Display Color Space",

services/core/java/com/android/server/display/whitebalance/DisplayWhiteBalanceController.java

+16 −1

Original line number	Diff line number	Diff line
		@@ -21,7 +21,6 @@ import android.util.Slog;
		import android.util.Spline;

		import com.android.internal.annotations.VisibleForTesting;
		import com.android.internal.util.Preconditions;
		import com.android.server.LocalServices;
		import com.android.server.display.color.ColorDisplayService.ColorDisplayServiceInternal;
		import com.android.server.display.utils.AmbientFilter;
		@@ -455,6 +454,22 @@ public class DisplayWhiteBalanceController implements
		mLastAmbientColorTemperature = mAmbientColorTemperature;
		}

		/**
		* Calculate the adjusted brightness, in nits, due to the DWB color adaptation
		*
		* @param requestedBrightnessNits brightness the framework requires to be output
		* @return the adjusted brightness the framework needs to output to counter the drop in
		* brightness due to DWB, or the requestedBrightnessNits if an adjustment cannot be made
		*/
		public float calculateAdjustedBrightnessNits(float requestedBrightnessNits) {
		float luminance = mColorDisplayServiceInternal.getDisplayWhiteBalanceLuminance();
		if (luminance == -1) {
		return requestedBrightnessNits;
		}
		float effectiveBrightness = requestedBrightnessNits * luminance;
		return (requestedBrightnessNits - effectiveBrightness) + requestedBrightnessNits;
		}

		/**
		* The DisplayWhiteBalanceController decouples itself from its parent (DisplayPowerController)
		* by providing this interface to implement (and a method to set its callbacks object), and

services/tests/servicestests/src/com/android/server/display/whitebalance/AmbientLuxTest.java

+16 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@ import static org.mockito.Matchers.any;
		import static org.mockito.Matchers.anyLong;
		import static org.mockito.Matchers.eq;
		import static org.mockito.Mockito.doAnswer;
		import static org.mockito.Mockito.doReturn;
		import static org.mockito.Mockito.mock;
		import static org.mockito.Mockito.spy;
		import static org.mockito.Mockito.when;
		@@ -37,7 +38,9 @@ import android.util.TypedValue;
		import androidx.test.InstrumentationRegistry;

		import com.android.internal.R;
		import com.android.server.LocalServices;
		import com.android.server.display.TestUtils;
		import com.android.server.display.color.ColorDisplayService;
		import com.android.server.display.utils.AmbientFilter;
		import com.android.server.display.utils.AmbientFilterStubber;

		@@ -75,6 +78,7 @@ public final class AmbientLuxTest {
		@Mock private TypedArray mHighLightBiases;
		@Mock private TypedArray mAmbientColorTemperatures;
		@Mock private TypedArray mDisplayColorTemperatures;
		@Mock private ColorDisplayService.ColorDisplayServiceInternal mColorDisplayServiceInternalMock;

		@Before
		public void setUp() throws Exception {
		@@ -120,6 +124,18 @@ public final class AmbientLuxTest {
		R.array.config_displayWhiteBalanceHighLightAmbientBiases))
		.thenReturn(mHighLightBiases);
		mockThrottler();
		LocalServices.removeServiceForTest(ColorDisplayService.ColorDisplayServiceInternal.class);
		LocalServices.addService(ColorDisplayService.ColorDisplayServiceInternal.class,
		mColorDisplayServiceInternalMock);
		}

		@Test
		public void testCalculateAdjustedBrightnessNits() {
		doReturn(0.9f).when(mColorDisplayServiceInternalMock).getDisplayWhiteBalanceLuminance();
		DisplayWhiteBalanceController controller =
		DisplayWhiteBalanceFactory.create(mHandler, mSensorManagerMock, mResourcesSpy);
		final float adjustedNits = controller.calculateAdjustedBrightnessNits(500f);
		assertEquals(/* expected= / 550f, adjustedNits, / delta= */ 0.001);
		}

		@Test