1 /* 2 * Copyright (C) 2023 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.internal.display; 18 19 import static android.hardware.display.DisplayManager.DISPLAY_CATEGORY_ALL_INCLUDING_DISABLED; 20 21 import android.content.Context; 22 import android.hardware.display.DisplayManager; 23 import android.util.Log; 24 import android.view.Display; 25 26 /** 27 * Constants and utility methods for refresh rate settings. 28 */ 29 public class RefreshRateSettingsUtils { 30 31 private static final String TAG = "RefreshRateSettingsUtils"; 32 33 public static final float DEFAULT_REFRESH_RATE = 60f; 34 35 /** 36 * Find the highest refresh rate among all the modes of the default display. 37 * 38 * This method will acquire DisplayManager.mLock, so calling it while holding other locks 39 * should be done with care. 40 * @param context The context 41 * @return The highest refresh rate 42 */ findHighestRefreshRateForDefaultDisplay(Context context)43 public static float findHighestRefreshRateForDefaultDisplay(Context context) { 44 final DisplayManager dm = context.getSystemService(DisplayManager.class); 45 final Display display = dm.getDisplay(Display.DEFAULT_DISPLAY); 46 if (display == null) { 47 Log.w(TAG, "No valid default display device"); 48 return DEFAULT_REFRESH_RATE; 49 } 50 51 float maxRefreshRate = DEFAULT_REFRESH_RATE; 52 for (Display.Mode mode : display.getSupportedModes()) { 53 if (mode.getRefreshRate() > maxRefreshRate) { 54 maxRefreshRate = mode.getRefreshRate(); 55 } 56 } 57 return maxRefreshRate; 58 } 59 60 /** 61 * Find the highest refresh rate among all the modes of all the displays. 62 * 63 * This method will acquire DisplayManager.mLock, so calling it while holding other locks 64 * should be done with care. 65 * @param context The context 66 * @return The highest refresh rate 67 */ findHighestRefreshRateAmongAllDisplays(Context context)68 public static float findHighestRefreshRateAmongAllDisplays(Context context) { 69 final DisplayManager dm = context.getSystemService(DisplayManager.class); 70 final Display[] displays = dm.getDisplays(DISPLAY_CATEGORY_ALL_INCLUDING_DISABLED); 71 if (displays.length == 0) { 72 Log.w(TAG, "No valid display devices"); 73 return DEFAULT_REFRESH_RATE; 74 } 75 76 float maxRefreshRate = DEFAULT_REFRESH_RATE; 77 for (Display display : displays) { 78 for (Display.Mode mode : display.getSupportedModes()) { 79 if (mode.getRefreshRate() > maxRefreshRate) { 80 maxRefreshRate = mode.getRefreshRate(); 81 } 82 } 83 } 84 return maxRefreshRate; 85 } 86 87 /** 88 * Find the highest refresh rate among all the modes of all the built-in/physical displays. 89 * 90 * This method will acquire DisplayManager.mLock, so calling it while holding other locks 91 * should be done with care. 92 * @param context The context 93 * @return The highest refresh rate 94 */ findHighestRefreshRateAmongAllBuiltInDisplays(Context context)95 public static float findHighestRefreshRateAmongAllBuiltInDisplays(Context context) { 96 final DisplayManager dm = context.getSystemService(DisplayManager.class); 97 final Display[] displays = dm.getDisplays(DISPLAY_CATEGORY_ALL_INCLUDING_DISABLED); 98 if (displays.length == 0) { 99 Log.w(TAG, "No valid display devices"); 100 return DEFAULT_REFRESH_RATE; 101 } 102 103 float maxRefreshRate = DEFAULT_REFRESH_RATE; 104 for (Display display : displays) { 105 if (display.getType() != Display.TYPE_INTERNAL) continue; 106 for (Display.Mode mode : display.getSupportedModes()) { 107 if (mode.getRefreshRate() > maxRefreshRate) { 108 maxRefreshRate = mode.getRefreshRate(); 109 } 110 } 111 } 112 return maxRefreshRate; 113 } 114 } 115