1 /* 2 * Copyright 2019 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.settings.development; 18 19 import android.content.Context; 20 import android.os.IBinder; 21 import android.os.Parcel; 22 import android.os.RemoteException; 23 import android.os.ServiceManager; 24 25 import androidx.annotation.VisibleForTesting; 26 import androidx.preference.Preference; 27 import androidx.preference.SwitchPreference; 28 29 import com.android.settings.core.PreferenceControllerMixin; 30 import com.android.settingslib.development.DeveloperOptionsPreferenceController; 31 32 /** 33 * Controller class for controlling the refresh rate overlay on SurfaceFlinger 34 */ 35 public class ShowRefreshRatePreferenceController extends DeveloperOptionsPreferenceController 36 implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin { 37 38 private static final String SHOW_REFRESH_RATE_KEY = "show_refresh_rate"; 39 40 private static final int SETTING_VALUE_QUERY = 2; 41 private static final int SETTING_VALUE_ON = 1; 42 private static final int SETTING_VALUE_OFF = 0; 43 44 @VisibleForTesting 45 static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger"; 46 @VisibleForTesting 47 static final int SURFACE_FLINGER_CODE = 1034; 48 49 private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer"; 50 51 private final IBinder mSurfaceFlinger; 52 ShowRefreshRatePreferenceController(Context context)53 public ShowRefreshRatePreferenceController(Context context) { 54 super(context); 55 mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY); 56 } 57 58 @Override getPreferenceKey()59 public String getPreferenceKey() { 60 return SHOW_REFRESH_RATE_KEY; 61 } 62 63 @Override onPreferenceChange(Preference preference, Object newValue)64 public boolean onPreferenceChange(Preference preference, Object newValue) { 65 final boolean isEnabled = (Boolean) newValue; 66 writeShowRefreshRateSetting(isEnabled); 67 return true; 68 } 69 70 @Override updateState(Preference preference)71 public void updateState(Preference preference) { 72 updateShowRefreshRateSetting(); 73 } 74 75 @Override onDeveloperOptionsSwitchDisabled()76 protected void onDeveloperOptionsSwitchDisabled() { 77 super.onDeveloperOptionsSwitchDisabled(); 78 final SwitchPreference preference = (SwitchPreference) mPreference; 79 if (preference.isChecked()) { 80 // Writing false to the preference when the setting is already off will have a 81 // side effect of turning on the preference that we wish to avoid 82 writeShowRefreshRateSetting(false); 83 preference.setChecked(false); 84 } 85 } 86 87 @VisibleForTesting updateShowRefreshRateSetting()88 void updateShowRefreshRateSetting() { 89 // magic communication with surface flinger. 90 try { 91 if (mSurfaceFlinger != null) { 92 final Parcel data = Parcel.obtain(); 93 final Parcel reply = Parcel.obtain(); 94 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 95 data.writeInt(SETTING_VALUE_QUERY); 96 mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data, reply, 0 /* flags */); 97 final boolean enabled = reply.readBoolean(); 98 ((SwitchPreference) mPreference).setChecked(enabled); 99 reply.recycle(); 100 data.recycle(); 101 } 102 } catch (RemoteException ex) { 103 // intentional no-op 104 } 105 } 106 107 @VisibleForTesting writeShowRefreshRateSetting(boolean isEnabled)108 void writeShowRefreshRateSetting(boolean isEnabled) { 109 try { 110 if (mSurfaceFlinger != null) { 111 final Parcel data = Parcel.obtain(); 112 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 113 final int showRefreshRate = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF; 114 data.writeInt(showRefreshRate); 115 mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data, 116 null /* reply */, 0 /* flags */); 117 data.recycle(); 118 } 119 } catch (RemoteException ex) { 120 // intentional no-op 121 } 122 updateShowRefreshRateSetting(); 123 } 124 } 125