1 /* 2 * Copyright (C) 2017 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 public class HardwareOverlaysPreferenceController extends DeveloperOptionsPreferenceController 33 implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin { 34 35 private static final String DISABLE_OVERLAYS_KEY = "disable_overlays"; 36 37 private static final int SETTING_VALUE_ON = 1; 38 private static final int SETTING_VALUE_OFF = 0; 39 private static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger"; 40 41 @VisibleForTesting 42 static final int SURFACE_FLINGER_READ_CODE = 1010; 43 44 private static final int SURFACE_FLINGER_DISABLE_OVERLAYS_CODE = 1008; 45 private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer"; 46 47 private final IBinder mSurfaceFlinger; 48 HardwareOverlaysPreferenceController(Context context)49 public HardwareOverlaysPreferenceController(Context context) { 50 super(context); 51 mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY); 52 } 53 54 @Override getPreferenceKey()55 public String getPreferenceKey() { 56 return DISABLE_OVERLAYS_KEY; 57 } 58 59 @Override onPreferenceChange(Preference preference, Object newValue)60 public boolean onPreferenceChange(Preference preference, Object newValue) { 61 final boolean isEnabled = (Boolean) newValue; 62 writeHardwareOverlaysSetting(isEnabled); 63 return true; 64 } 65 66 @Override updateState(Preference preference)67 public void updateState(Preference preference) { 68 updateHardwareOverlaysSetting(); 69 } 70 71 @Override onDeveloperOptionsSwitchDisabled()72 protected void onDeveloperOptionsSwitchDisabled() { 73 super.onDeveloperOptionsSwitchDisabled(); 74 final SwitchPreference switchPreference = (SwitchPreference) mPreference; 75 if (switchPreference.isChecked()) { 76 // Writing false to the preference when the setting is already off will have a 77 // side effect of turning on the preference that we wish to avoid 78 writeHardwareOverlaysSetting(false); 79 switchPreference.setChecked(false); 80 } 81 } 82 83 @VisibleForTesting updateHardwareOverlaysSetting()84 void updateHardwareOverlaysSetting() { 85 if (mSurfaceFlinger == null) { 86 return; 87 } 88 // magic communication with surface flinger. 89 try { 90 final Parcel data = Parcel.obtain(); 91 final Parcel reply = Parcel.obtain(); 92 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 93 mSurfaceFlinger.transact(SURFACE_FLINGER_READ_CODE, data, reply, 0 /* flags */); 94 @SuppressWarnings("unused") final int showCpu = reply.readInt(); 95 @SuppressWarnings("unused") final int enableGL = reply.readInt(); 96 @SuppressWarnings("unused") final int showUpdates = reply.readInt(); 97 @SuppressWarnings("unused") final int showBackground = reply.readInt(); 98 final int disableOverlays = reply.readInt(); 99 ((SwitchPreference) mPreference).setChecked(disableOverlays != SETTING_VALUE_OFF); 100 reply.recycle(); 101 data.recycle(); 102 } catch (RemoteException ex) { 103 // intentional no-op 104 } 105 } 106 107 @VisibleForTesting writeHardwareOverlaysSetting(boolean isEnabled)108 void writeHardwareOverlaysSetting(boolean isEnabled) { 109 if (mSurfaceFlinger == null) { 110 return; 111 } 112 try { 113 final Parcel data = Parcel.obtain(); 114 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 115 final int disableOverlays = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF; 116 data.writeInt(disableOverlays); 117 mSurfaceFlinger.transact(SURFACE_FLINGER_DISABLE_OVERLAYS_CODE, data, 118 null /* reply */, 0 /* flags */); 119 data.recycle(); 120 } catch (RemoteException ex) { 121 // intentional no-op 122 } 123 updateHardwareOverlaysSetting(); 124 } 125 } 126