services/core/java/com/android/server/lights/LightsService.java

/* * Copyright (C) 2008 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.server.lights;

import android.app.ActivityManager;
import android.content.Context;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.PowerManager;
import android.os.Trace;
import android.provider.Settings;
import android.util.Slog;
import android.view.SurfaceControl;

import com.android.server.SystemService;

public class LightsService extends SystemService {
    static final String TAG = "LightsService";
    static final boolean DEBUG = false;

    final LightImpl mLights[] = new LightImpl[LightsManager.LIGHT_ID_COUNT];

    private final class LightImpl extends Light {

        private final IBinder mDisplayToken;
        private final int mSurfaceControlMaximumBrightness;

        private LightImpl(Context context, int id) {
            mId = id;
            mDisplayToken = SurfaceControl.getInternalDisplayToken();
            final boolean brightnessSupport = SurfaceControl.getDisplayBrightnessSupport(
                    mDisplayToken);
            if (DEBUG) {
                Slog.d(TAG, "Display brightness support: " + brightnessSupport);
            }
            int maximumBrightness = 0;
            if (brightnessSupport) {
                PowerManager pm = context.getSystemService(PowerManager.class);
                if (pm != null) {
                    maximumBrightness = pm.getMaximumScreenBrightnessSetting();
                }
            }
            mSurfaceControlMaximumBrightness = maximumBrightness;
        }

        @Override
        public void setBrightness(int brightness) {
            setBrightness(brightness, BRIGHTNESS_MODE_USER);
        }

        @Override
        public void setBrightness(int brightness, int brightnessMode) {
            synchronized (this) {
                // LOW_PERSISTENCE cannot be manually set
                if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
                    Slog.w(TAG, "setBrightness with LOW_PERSISTENCE unexpected #" + mId +
                            ": brightness=0x" + Integer.toHexString(brightness));
                    return;
                }
                // Ideally, we'd like to set the brightness mode through the SF/HWC as well, but
                // right now we just fall back to the old path through Lights brightessMode is
                // anything but USER or the device shouldBeInLowPersistenceMode().
                if (brightnessMode == BRIGHTNESS_MODE_USER && !shouldBeInLowPersistenceMode()
                        && mSurfaceControlMaximumBrightness == 255) {
                    // TODO: the last check should be mSurfaceControlMaximumBrightness != 0; the
                    // reason we enforce 255 right now is to stay consistent with the old path. In
                    // the future, the framework should be refactored so that brightness is a float
                    // between 0.0f and 1.0f, and the actual number of supported brightness levels
                    // is determined in the device-specific implementation.
                    if (DEBUG) {
                        Slog.d(TAG, "Using new setBrightness path!");
                    }
                    if (brightness == 0) {
                        SurfaceControl.setDisplayBrightness(mDisplayToken, -1.0f);
                    } else {
                        SurfaceControl.setDisplayBrightness(mDisplayToken,
                                (float) (brightness - 1) / (mSurfaceControlMaximumBrightness - 1));
                    }
                } else {
                    int color = brightness & 0x000000ff;
                    color = 0xff000000 | (color << 16) | (color << 8) | color;
                    setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);
                }
            }
        }

        @Override
        public void setColor(int color) {
            synchronized (this) {
                setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, 0);
            }
        }

        @Override
        public void setFlashing(int color, int mode, int onMS, int offMS) {
            synchronized (this) {
                setLightLocked(color, mode, onMS, offMS, BRIGHTNESS_MODE_USER);
            }
        }

        @Override
        public void pulse() {
            pulse(0x00ffffff, 7);
        }

        @Override
        public void pulse(int color, int onMS) {
            synchronized (this) {
                if (mColor == 0 && !mFlashing) {
                    setLightLocked(color, LIGHT_FLASH_HARDWARE, onMS, 1000,
                            BRIGHTNESS_MODE_USER);
                    mColor = 0;
                    mH.sendMessageDelayed(Message.obtain(mH, 1, this), onMS);
                }
            }
        }

        @Override
        public void turnOff() {
            synchronized (this) {
                setLightLocked(0, LIGHT_FLASH_NONE, 0, 0, 0);
            }
        }

        @Override
        public void setVrMode(boolean enabled) {
            synchronized (this) {
                if (mVrModeEnabled != enabled) {
                    mVrModeEnabled = enabled;

                    mUseLowPersistenceForVR =
                            (getVrDisplayMode() == Settings.Secure.VR_DISPLAY_MODE_LOW_PERSISTENCE);
                    if (shouldBeInLowPersistenceMode()) {
                        mLastBrightnessMode = mBrightnessMode;
                    }

                    // NOTE: We do not trigger a call to setLightLocked here.  We do not know the
                    // current brightness or other values when leaving VR so we avoid any incorrect
                    // jumps. The code that calls this method will immediately issue a brightness
                    // update which is when the change will occur.
                }
            }
        }

        private void stopFlashing() {
            synchronized (this) {
                setLightLocked(mColor, LIGHT_FLASH_NONE, 0, 0, BRIGHTNESS_MODE_USER);
            }
        }

        private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {
            if (shouldBeInLowPersistenceMode()) {
                brightnessMode = BRIGHTNESS_MODE_LOW_PERSISTENCE;
            } else if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
                brightnessMode = mLastBrightnessMode;
            }

            if (!mInitialized || color != mColor || mode != mMode || onMS != mOnMS ||
                    offMS != mOffMS || mBrightnessMode != brightnessMode) {
                if (DEBUG) Slog.v(TAG, "setLight #" + mId + ": color=#"
                        + Integer.toHexString(color) + ": brightnessMode=" + brightnessMode);
                mInitialized = true;
                mLastColor = mColor;
                mColor = color;
                mMode = mode;
                mOnMS = onMS;
                mOffMS = offMS;
                mBrightnessMode = brightnessMode;
                Trace.traceBegin(Trace.TRACE_TAG_POWER, "setLight(" + mId + ", 0x"
                        + Integer.toHexString(color) + ")");
                try {
                    setLight_native(mId, color, mode, onMS, offMS, brightnessMode);
                } finally {
                    Trace.traceEnd(Trace.TRACE_TAG_POWER);
                }
            }
        }

        private boolean shouldBeInLowPersistenceMode() {
            return mVrModeEnabled && mUseLowPersistenceForVR;
        }

        private int mId;
        private int mColor;
        private int mMode;
        private int mOnMS;
        private int mOffMS;
        private boolean mFlashing;
        private int mBrightnessMode;
        private int mLastBrightnessMode;
        private int mLastColor;
        private boolean mVrModeEnabled;
        private boolean mUseLowPersistenceForVR;
        private boolean mInitialized;
    }

    public LightsService(Context context) {
        super(context);

        for (int i = 0; i < LightsManager.LIGHT_ID_COUNT; i++) {
            mLights[i] = new LightImpl(context, i);
        }
    }

    @Override
    public void onStart() {
        publishLocalService(LightsManager.class, mService);
    }

    @Override
    public void onBootPhase(int phase) {
    }

    private int getVrDisplayMode() {
        int currentUser = ActivityManager.getCurrentUser();
        return Settings.Secure.getIntForUser(getContext().getContentResolver(),
                Settings.Secure.VR_DISPLAY_MODE,
                /*default*/Settings.Secure.VR_DISPLAY_MODE_LOW_PERSISTENCE,
                currentUser);
    }

    private final LightsManager mService = new LightsManager() {
        @Override
        public Light getLight(int id) {
            if (0 <= id && id < LIGHT_ID_COUNT) {
                return mLights[id];
            } else {
                return null;
            }
        }
    };

    private Handler mH = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            LightImpl light = (LightImpl)msg.obj;
            light.stopFlashing();
        }
    };

    static native void setLight_native(int light, int color, int mode,
            int onMS, int offMS, int brightnessMode);
}