Merge "Convert BrightnessUtils to use brightness as float" into rvc-dev am:... (363e1113) · Commits · e / os / android_frameworks_base

packages/SettingsLib/src/com/android/settingslib/display/BrightnessUtils.java

+8 −13

Original line number	Diff line number	Diff line
		@@ -67,7 +67,7 @@ public class BrightnessUtils {

		/**
		* Version of {@link #convertGammaToLinear} that takes and returns float values.
		* TODO: brightnessfloat Merge with above method later.
		* TODO(flc): refactor Android Auto to use float version
		*
		* @param val The slider value.
		* @param min The minimum acceptable value for the setting.
		@@ -83,9 +83,13 @@ public class BrightnessUtils {
		ret = MathUtils.exp((normalizedVal - C) / A) + B;
		}

		// HLG is normalized to the range [0, 12], so we need to re-normalize to the range [0, 1]
		// HLG is normalized to the range [0, 12], ensure that value is within that range,
		// it shouldn't be out of bounds.
		final float normalizedRet = MathUtils.constrain(ret, 0, 12);

		// Re-normalize to the range [0, 1]
		// in order to derive the correct setting value.
		return MathUtils.lerp(min, max, ret / 12);
		return MathUtils.lerp(min, max, normalizedRet / 12);
		}

		/**
		@@ -111,16 +115,7 @@ public class BrightnessUtils {
		* @return The corresponding slider value
		*/
		public static final int convertLinearToGamma(int val, int min, int max) {
		// For some reason, HLG normalizes to the range [0, 12] rather than [0, 1]
		final float normalizedVal = MathUtils.norm(min, max, val) * 12;
		final float ret;
		if (normalizedVal <= 1f) {
		ret = MathUtils.sqrt(normalizedVal) * R;
		} else {
		ret = A * MathUtils.log(normalizedVal - B) + C;
		}

		return Math.round(MathUtils.lerp(GAMMA_SPACE_MIN, GAMMA_SPACE_MAX, ret));
		return convertLinearToGammaFloat((float) val, (float) min, (float) max);
		}

		/**

packages/SettingsLib/tests/robotests/src/com/android/settingslib/display/BrightnessUtilsTest.java

+22 −7

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		package com.android.settingslib.display;

		import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MAX;
		import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MIN;

		import static com.google.common.truth.Truth.assertThat;

		@@ -27,26 +28,40 @@ import org.robolectric.RobolectricTestRunner;
		@RunWith(RobolectricTestRunner.class)
		public class BrightnessUtilsTest {

		private static final int MIN = 1;
		private static final int MAX = 255;
		private static final int MIN_INT = 1;
		private static final int MAX_INT = 255;
		private static final float MIN_FLOAT = 0.0f;
		private static final float MAX_FLOAT = 1.0f;

		@Test
		public void linearToGamma_minValue_shouldReturn0() {
		assertThat(BrightnessUtils.convertLinearToGamma(MIN, MIN, MAX)).isEqualTo(0);
		public void linearToGamma_minValue_shouldReturnMin() {
		assertThat(BrightnessUtils.convertLinearToGamma(MIN_INT, MIN_INT, MAX_INT))
		.isEqualTo(GAMMA_SPACE_MIN);
		assertThat(BrightnessUtils.convertLinearToGammaFloat(MIN_FLOAT, MIN_FLOAT, MAX_FLOAT))
		.isEqualTo(GAMMA_SPACE_MIN);
		}

		@Test
		public void linearToGamma_maxValue_shouldReturnGammaSpaceMax() {
		assertThat(BrightnessUtils.convertLinearToGamma(MAX, MIN, MAX)).isEqualTo(GAMMA_SPACE_MAX);
		assertThat(BrightnessUtils.convertLinearToGamma(MAX_INT, MIN_INT, MAX_INT))
		.isEqualTo(GAMMA_SPACE_MAX);
		assertThat(BrightnessUtils.convertLinearToGammaFloat(MAX_FLOAT, MIN_FLOAT, MAX_FLOAT))
		.isEqualTo(GAMMA_SPACE_MAX);
		}

		@Test
		public void gammaToLinear_minValue_shouldReturnMin() {
		assertThat(BrightnessUtils.convertGammaToLinear(MIN, MIN, MAX)).isEqualTo(MIN);
		assertThat(BrightnessUtils.convertGammaToLinear(GAMMA_SPACE_MIN, MIN_INT, MAX_INT))
		.isEqualTo(MIN_INT);
		assertThat(BrightnessUtils.convertGammaToLinearFloat(GAMMA_SPACE_MIN, MIN_FLOAT, MAX_FLOAT))
		.isEqualTo(MIN_FLOAT);
		}

		@Test
		public void gammaToLinear_gammaSpaceValue_shouldReturnMax() {
		assertThat(BrightnessUtils.convertGammaToLinear(GAMMA_SPACE_MAX, MIN, MAX)).isEqualTo(MAX);
		assertThat(BrightnessUtils.convertGammaToLinear(GAMMA_SPACE_MAX, MIN_INT, MAX_INT))
		.isEqualTo(MAX_INT);
		assertThat(BrightnessUtils.convertGammaToLinearFloat(GAMMA_SPACE_MAX, MIN_FLOAT, MAX_FLOAT))
		.isEqualTo(MAX_FLOAT);
		}
		}