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/*
* Copyright (C) 2017 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 com.android.settings.development;
import android.content.Context;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.os.ServiceManager;
import androidx.annotation.VisibleForTesting;
import androidx.preference.Preference;
import androidx.preference.SwitchPreference;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.development.DeveloperOptionsPreferenceController;
public class HardwareOverlaysPreferenceController extends DeveloperOptionsPreferenceController
implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
private static final String DISABLE_OVERLAYS_KEY = "disable_overlays";
private static final int SETTING_VALUE_ON = 1;
private static final int SETTING_VALUE_OFF = 0;
private static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger";
@VisibleForTesting
static final int SURFACE_FLINGER_READ_CODE = 1010;
private static final int SURFACE_FLINGER_DISABLE_OVERLAYS_CODE = 1008;
private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer";
private final IBinder mSurfaceFlinger;
public HardwareOverlaysPreferenceController(Context context) {
super(context);
mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY);
}
@Override
public String getPreferenceKey() {
return DISABLE_OVERLAYS_KEY;
}
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
final boolean isEnabled = (Boolean) newValue;
writeHardwareOverlaysSetting(isEnabled);
return true;
}
@Override
public void updateState(Preference preference) {
updateHardwareOverlaysSetting();
}
@Override
protected void onDeveloperOptionsSwitchDisabled() {
super.onDeveloperOptionsSwitchDisabled();
final SwitchPreference switchPreference = (SwitchPreference) mPreference;
if (switchPreference.isChecked()) {
// Writing false to the preference when the setting is already off will have a
// side effect of turning on the preference that we wish to avoid
writeHardwareOverlaysSetting(false);
switchPreference.setChecked(false);
}
}
@VisibleForTesting
void updateHardwareOverlaysSetting() {
if (mSurfaceFlinger == null) {
return;
}
// magic communication with surface flinger.
try {
final Parcel data = Parcel.obtain();
final Parcel reply = Parcel.obtain();
data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
mSurfaceFlinger.transact(SURFACE_FLINGER_READ_CODE, data, reply, 0 /* flags */);
@SuppressWarnings("unused") final int showCpu = reply.readInt();
@SuppressWarnings("unused") final int enableGL = reply.readInt();
@SuppressWarnings("unused") final int showUpdates = reply.readInt();
@SuppressWarnings("unused") final int showBackground = reply.readInt();
final int disableOverlays = reply.readInt();
((SwitchPreference) mPreference).setChecked(disableOverlays != SETTING_VALUE_OFF);
reply.recycle();
data.recycle();
} catch (RemoteException ex) {
// intentional no-op
}
}
@VisibleForTesting
void writeHardwareOverlaysSetting(boolean isEnabled) {
if (mSurfaceFlinger == null) {
return;
}
try {
final Parcel data = Parcel.obtain();
data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
final int disableOverlays = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF;
data.writeInt(disableOverlays);
mSurfaceFlinger.transact(SURFACE_FLINGER_DISABLE_OVERLAYS_CODE, data,
null /* reply */, 0 /* flags */);
data.recycle();
} catch (RemoteException ex) {
// intentional no-op
}
updateHardwareOverlaysSetting();
}
}
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