| /* |
| * Copyright (C) 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.os; |
| |
| import android.content.Context; |
| import android.hardware.display.DisplayManager; |
| import android.perftests.utils.BenchmarkState; |
| import android.perftests.utils.PerfStatusReporter; |
| import android.provider.Settings; |
| import android.view.Display; |
| |
| import androidx.test.platform.app.InstrumentationRegistry; |
| import androidx.test.runner.AndroidJUnit4; |
| |
| import com.android.compatibility.common.util.PollingCheck; |
| |
| import org.junit.Before; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @RunWith(AndroidJUnit4.class) |
| public final class DisplayPerfTest { |
| private static final float DELTA = 0.001f; |
| |
| @Rule |
| public final PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter(); |
| |
| private DisplayManager mDisplayManager; |
| private Context mContext; |
| |
| @Before |
| public void setUp() { |
| mContext = InstrumentationRegistry.getInstrumentation().getTargetContext(); |
| mDisplayManager = mContext.getSystemService(DisplayManager.class); |
| } |
| |
| @Test |
| public void testBrightnessChanges() throws Exception { |
| final BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| Settings.System.putInt(mContext.getContentResolver(), |
| Settings.System.SCREEN_BRIGHTNESS_MODE, |
| Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); |
| SystemClock.sleep(20); |
| float brightness = 0.3f; |
| while (state.keepRunning()) { |
| setAndWaitToChangeBrightness(brightness); |
| brightness = toggleBrightness(brightness); |
| } |
| } |
| |
| private float toggleBrightness(float oldBrightness) { |
| float[] brightnesses = new float[]{0.3f, 0.5f}; |
| if (oldBrightness == brightnesses[0]) { |
| return brightnesses[1]; |
| } |
| return brightnesses[0]; |
| } |
| |
| private void setAndWaitToChangeBrightness(float brightness) throws Exception { |
| mDisplayManager.setBrightness(0, brightness); |
| PollingCheck.check("Brightness is not set to the expected value", 500, |
| () -> isInRange(mDisplayManager.getBrightness(Display.DEFAULT_DISPLAY), brightness, |
| DELTA)); |
| } |
| |
| private boolean isInRange(float value, float target, float delta) { |
| return target - delta <= value && target + delta >= value; |
| } |
| } |