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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 package com.android.settings.display;
     15 
     16 import android.content.Context;
     17 import android.os.IBinder;
     18 import android.os.Parcel;
     19 import android.os.RemoteException;
     20 import android.os.ServiceManager;
     21 import android.util.Log;
     22 
     23 import com.android.internal.annotations.VisibleForTesting;
     24 import com.android.settings.core.PreferenceControllerMixin;
     25 import com.android.settingslib.core.AbstractPreferenceController;
     26 
     27 public class ColorModePreferenceController extends AbstractPreferenceController implements
     28         PreferenceControllerMixin {
     29     private static final String TAG = "ColorModePreference";
     30     private static final String KEY_COLOR_MODE = "color_mode";
     31 
     32     private static final int SURFACE_FLINGER_TRANSACTION_QUERY_WIDE_COLOR = 1024;
     33 
     34     private final ConfigurationWrapper mConfigWrapper;
     35 
     36     public ColorModePreferenceController(Context context) {
     37         super(context);
     38         mConfigWrapper = new ConfigurationWrapper();
     39     }
     40 
     41     @Override
     42     public String getPreferenceKey() {
     43         return KEY_COLOR_MODE;
     44     }
     45 
     46     @Override
     47     public boolean isAvailable() {
     48         return mConfigWrapper.isScreenWideColorGamut();
     49     }
     50 
     51     @VisibleForTesting
     52     static class ConfigurationWrapper {
     53         private final IBinder mSurfaceFlinger;
     54 
     55         ConfigurationWrapper() {
     56             mSurfaceFlinger = ServiceManager.getService("SurfaceFlinger");
     57         }
     58 
     59         boolean isScreenWideColorGamut() {
     60             if (mSurfaceFlinger != null) {
     61                 final Parcel data = Parcel.obtain();
     62                 final Parcel reply = Parcel.obtain();
     63                 data.writeInterfaceToken("android.ui.ISurfaceComposer");
     64                 try {
     65                     mSurfaceFlinger.transact(SURFACE_FLINGER_TRANSACTION_QUERY_WIDE_COLOR,
     66                             data, reply, 0);
     67                     return reply.readBoolean();
     68                 } catch (RemoteException ex) {
     69                     Log.e(TAG, "Failed to query wide color support", ex);
     70                 } finally {
     71                     data.recycle();
     72                     reply.recycle();
     73                 }
     74             }
     75             return false;
     76         }
     77     }
     78 }
     79