1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.display.brightness.strategy; 18 19 import android.hardware.display.DisplayManagerInternal; 20 import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 21 import android.os.PowerManager; 22 23 import com.android.server.display.DisplayBrightnessState; 24 import com.android.server.display.brightness.BrightnessReason; 25 import com.android.server.display.brightness.BrightnessUtils; 26 import com.android.server.display.brightness.StrategyExecutionRequest; 27 import com.android.server.display.brightness.StrategySelectionNotifyRequest; 28 29 import java.io.PrintWriter; 30 31 /** 32 * Manages the brightness of the display when the system brightness is overridden 33 */ 34 public class OverrideBrightnessStrategy implements DisplayBrightnessStrategy { 35 36 private float mWindowManagerBrightnessOverride = PowerManager.BRIGHTNESS_INVALID_FLOAT; 37 private CharSequence mWindowManagerBrightnessOverrideTag = null; 38 39 @Override updateBrightness( StrategyExecutionRequest strategyExecutionRequest)40 public DisplayBrightnessState updateBrightness( 41 StrategyExecutionRequest strategyExecutionRequest) { 42 // Todo(b/241308599): Introduce a validator class and add validations before setting 43 // the brightness 44 DisplayPowerRequest dpr = strategyExecutionRequest.getDisplayPowerRequest(); 45 BrightnessReason reason = new BrightnessReason(BrightnessReason.REASON_OVERRIDE); 46 47 float brightness = dpr.screenBrightnessOverride; 48 if (BrightnessUtils.isValidBrightnessValue(dpr.screenBrightnessOverride)) { 49 brightness = dpr.screenBrightnessOverride; 50 reason.setTag(dpr.screenBrightnessOverrideTag); 51 } else if (BrightnessUtils.isValidBrightnessValue(mWindowManagerBrightnessOverride)) { 52 brightness = mWindowManagerBrightnessOverride; 53 reason.setTag(mWindowManagerBrightnessOverrideTag); 54 } 55 56 return new DisplayBrightnessState.Builder() 57 .setBrightness(brightness) 58 .setBrightnessReason(reason) 59 .setDisplayBrightnessStrategyName(getName()) 60 .build(); 61 } 62 63 @Override getName()64 public String getName() { 65 return "OverrideBrightnessStrategy"; 66 } 67 68 @Override dump(PrintWriter writer)69 public void dump(PrintWriter writer) { 70 writer.println("OverrideBrightnessStrategy:"); 71 writer.println(" mWindowManagerBrightnessOverride=" + mWindowManagerBrightnessOverride); 72 writer.println(" mWindowManagerBrightnessOverrideTag=" 73 + mWindowManagerBrightnessOverrideTag); 74 } 75 76 @Override strategySelectionPostProcessor( StrategySelectionNotifyRequest strategySelectionNotifyRequest)77 public void strategySelectionPostProcessor( 78 StrategySelectionNotifyRequest strategySelectionNotifyRequest) { 79 // DO NOTHING 80 } 81 82 /** 83 * Updates the brightness override from WindowManager. 84 * 85 * @param request The request to override the brightness 86 * @return whether this request will result in a change of the brightness 87 */ updateWindowManagerBrightnessOverride( DisplayManagerInternal.DisplayBrightnessOverrideRequest request)88 public boolean updateWindowManagerBrightnessOverride( 89 DisplayManagerInternal.DisplayBrightnessOverrideRequest request) { 90 float newBrightness = request == null 91 ? PowerManager.BRIGHTNESS_INVALID_FLOAT : request.brightness; 92 mWindowManagerBrightnessOverrideTag = request == null ? null : request.tag; 93 94 if (floatEquals(newBrightness, mWindowManagerBrightnessOverride)) { 95 return false; 96 } 97 98 mWindowManagerBrightnessOverride = newBrightness; 99 return true; 100 } 101 102 /** 103 * Returns the current brightness override from WindowManager. 104 */ getWindowManagerBrightnessOverride()105 public float getWindowManagerBrightnessOverride() { 106 return mWindowManagerBrightnessOverride; 107 } 108 floatEquals(float f1, float f2)109 private boolean floatEquals(float f1, float f2) { 110 return f1 == f2 || (Float.isNaN(f1) && Float.isNaN(f2)); 111 } 112 113 @Override getReason()114 public int getReason() { 115 return BrightnessReason.REASON_OVERRIDE; 116 } 117 } 118