Merge "Add saturation boost setting"

src/com/android/settings/display/ColorModePreferenceController.java

@@ -0,0 +1,118 @@
+/*
+ * 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.display;
+
+import android.content.Context;
+import android.os.IBinder;
+import android.os.Parcel;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.SystemProperties;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.TwoStatePreference;
+import android.util.Log;
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.core.PreferenceController;
+
+public class ColorModePreferenceController extends PreferenceController implements
+        Preference.OnPreferenceChangeListener {
+    private static final String TAG = "ColorModePreference";
+
+    private static final String KEY_COLOR_MODE = "color_mode";
+
+    @VisibleForTesting
+    static final float COLOR_SATURATION_DEFAULT = 1.0f;
+    @VisibleForTesting
+    static final float COLOR_SATURATION_VIVID = 1.1f;
+
+    private static final int SURFACE_FLINGER_TRANSACTION_SATURATION = 1022;
+    @VisibleForTesting
+    static final String PERSISTENT_PROPERTY_SATURATION = "persist.sys.sf.color_saturation";
+
+    private final IBinder mSurfaceFlinger;
+    private final ConfigurationWrapper mConfigWrapper;
+
+    public ColorModePreferenceController(Context context) {
+        super(context);
+        mSurfaceFlinger = ServiceManager.getService("SurfaceFlinger");
+        mConfigWrapper = new ConfigurationWrapper(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_COLOR_MODE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        TwoStatePreference colorMode = (TwoStatePreference) preference;
+        colorMode.setChecked(getSaturationValue() > 1.0f);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mConfigWrapper.isScreenWideColorGamut();
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        float saturation = (boolean) newValue
+                ? COLOR_SATURATION_VIVID : COLOR_SATURATION_DEFAULT;
+
+        SystemProperties.set(PERSISTENT_PROPERTY_SATURATION, Float.toString(saturation));
+        applySaturation(saturation);
+
+        return true;
+    }
+
+    /**
+     * Propagates the provided saturation to the SurfaceFlinger.
+     */
+    private void applySaturation(float saturation) {
+        if (mSurfaceFlinger != null) {
+            final Parcel data = Parcel.obtain();
+            data.writeInterfaceToken("android.ui.ISurfaceComposer");
+            data.writeFloat(saturation);
+            try {
+                mSurfaceFlinger.transact(SURFACE_FLINGER_TRANSACTION_SATURATION, data, null, 0);
+            } catch (RemoteException ex) {
+                Log.e(TAG, "Failed to set saturation", ex);
+            } finally {
+                data.recycle();
+            }
+        }
+    }
+
+    private static float getSaturationValue() {
+        try {
+            return Float.parseFloat(SystemProperties.get(
+                    PERSISTENT_PROPERTY_SATURATION, Float.toString(COLOR_SATURATION_DEFAULT)));
+        } catch (NumberFormatException e) {
+            return COLOR_SATURATION_DEFAULT;
+        }
+    }
+
+    @VisibleForTesting
+    static class ConfigurationWrapper {
+        private final Context mContext;
+
+        ConfigurationWrapper(Context context) {
+            mContext = context;
+        }
+
+        boolean isScreenWideColorGamut() {
+            return mContext.getResources().getConfiguration().isScreenWideColorGamut();
+        }
+    }
+}