Android7.0 PowerManagerService亮灭屏分析(三)
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在前面两部分已经对绘制windows与设置设备状态进行了详细讲解. 之后接着就该对亮度值进行设置, 实现亮屏动作了.
在DisplayPowerController中的animateScreenBrightness函数通过亮度渐变动画来将亮度设置到目标亮度.
-
- private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40;
-
- mBrightnessRampRateFast = resources.getInteger(
- com.android.internal.R.integer.config_brightness_ramp_rate_fast);
-
-
-
- if (!mPendingScreenOff) {
- if (state == Display.STATE_ON || state == Display.STATE_DOZE) {
- animateScreenBrightness(brightness,
- slowChange ? BRIGHTNESS_RAMP_RATE_SLOW : mBrightnessRampRateFast);
- } else {
- animateScreenBrightness(brightness, 0);
- }
- }
在animateScreenBrightness函数中调用动画mScreenBrightnessRampAnimator对亮度值处理, 而mScreenBrightnessRampAnimator是在initialize()函数中进行初始化的, 在构造函数中将DisplayPowerState和DisplayPowerState.SCREEN_BRIGHTNESS传输过去.- private void initialize() {
-
- mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>(
- mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS);
- mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener);
-
- }
-
- private void animateScreenBrightness(int target, int rate) {
- if (DEBUG) {
- Slog.d(TAG, "Animating brightness: target=" + target +", rate=" + rate);
- }
- if (mScreenBrightnessRampAnimator.animateTo(target, rate)) {
- try {
- mBatteryStats.noteScreenBrightness(target);
- } catch (RemoteException ex) {
-
- }
- }
- }
在RampAnimator的构造函数中将DisplayPowerState赋值给mObject, DisplayPowerState.SCREEN_BRIGHTNESS赋值给mProperty, 并且创建mChoreographer实例.
- public RampAnimator(T object, IntProperty<T> property) {
- mObject = object;
- mProperty = property;
- mChoreographer = Choreographer.getInstance();
- }
下面重点讲解animateTo函数.
- public boolean animateTo(int target, int rate) {
-
- if (mFirstTime || rate <= 0) {
- if (mFirstTime || target != mCurrentValue) {
- mFirstTime = false;
- mRate = 0;
- mTargetValue = target;
- mCurrentValue = target;
- mProperty.setValue(mObject, target);
- if (mAnimating) {
- mAnimating = false;
- cancelAnimationCallback();
- }
- if (mListener != null) {
- mListener.onAnimationEnd();
- }
- return true;
- }
- return false;
- }
-
-
-
-
-
-
-
-
- if (!mAnimating
- || rate > mRate
- || (target <= mCurrentValue && mCurrentValue <= mTargetValue)
- || (mTargetValue <= mCurrentValue && mCurrentValue <= target)) {
- mRate = rate;
- }
-
- final boolean changed = (mTargetValue != target);
- mTargetValue = target;
-
-
- if (!mAnimating && target != mCurrentValue) {
- mAnimating = true;
- mAnimatedValue = mCurrentValue;
- mLastFrameTimeNanos = System.nanoTime();
- postAnimationCallback();
- }
-
- return changed;
- }
在postAnimationCallback中调用Choreographer的postCallback函数处理, 调用完成后回调回mAnimationCallback的run函数- private void postAnimationCallback() {
- mChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, mAnimationCallback, null);
- }
-
- private final Runnable mAnimationCallback = new Runnable() {
- @Override
- public void run() {
- final long frameTimeNanos = mChoreographer.getFrameTimeNanos();
- final float timeDelta = (frameTimeNanos - mLastFrameTimeNanos)
- * 0.000000001f;
- mLastFrameTimeNanos = frameTimeNanos;
-
-
-
-
-
- final float scale = ValueAnimator.getDurationScale();
- if (scale == 0) {
-
- mAnimatedValue = mTargetValue;
- } else {
- final float amount = timeDelta * mRate / scale;
- if (mTargetValue > mCurrentValue) {
- mAnimatedValue = Math.min(mAnimatedValue + amount, mTargetValue);
- } else {
- mAnimatedValue = Math.max(mAnimatedValue - amount, mTargetValue);
- }
- }
- final int oldCurrentValue = mCurrentValue;
- mCurrentValue = Math.round(mAnimatedValue);
-
- if (oldCurrentValue != mCurrentValue) {
- mProperty.setValue(mObject, mCurrentValue);
- }
-
- if (mTargetValue != mCurrentValue) {
- postAnimationCallback();
- } else {
- mAnimating = false;
- if (mListener != null) {
- mListener.onAnimationEnd();
- }
- }
- }
- };
DisplayPowerState.SCREEN_BRIGHTNESS的setValue函数是在DisplayPowerState中实现的.- public static final IntProperty<DisplayPowerState> SCREEN_BRIGHTNESS =
- new IntProperty<DisplayPowerState>("screenBrightness") {
- @Override
- public void setValue(DisplayPowerState object, int value) {
- object.setScreenBrightness(value);
- }
-
- @Override
- public Integer get(DisplayPowerState object) {
- return object.getScreenBrightness();
- }
- };
-
- public void setScreenBrightness(int brightness) {
- if (mScreenBrightness != brightness) {
- if (DEBUG) {
- Slog.d(TAG, "setScreenBrightness: brightness=" + brightness);
- }
-
- mScreenBrightness = brightness;
- if (mScreenState != Display.STATE_OFF) {
- mScreenReady = false;
- scheduleScreenUpdate();
- }
- }
- }
scheduleScreenUpdate函数最终通过Handler发送mScreenUpdateRunnable对象来更新亮度值. 从run函数中可以看出只有当mColorFadeLevel > 0f时才能给brightness设置亮度值, 所以说当windows没有绘制完成时就算mScreenBrightness有值不为0, 但是brightness仍然为0不能点亮屏幕.- private final Runnable mScreenUpdateRunnable = new Runnable() {
- @Override
- public void run() {
- mScreenUpdatePending = false;
-
- int brightness = mScreenState != Display.STATE_OFF
- && mColorFadeLevel > 0f ? mScreenBrightness : 0;
- if (mPhotonicModulator.setState(mScreenState, brightness)) {
- if (DEBUG) {
- Slog.d(TAG, "Screen ready");
- }
- mScreenReady = true;
- invokeCleanListenerIfNeeded();
- } else {
- if (DEBUG) {
- Slog.d(TAG, "Screen not ready");
- }
- }
- }
- };
之后的流程就与设置设置状态的流程相同了, 调用DisplayManagerService中DisplayBlanker的requestDisplayState函数.- DisplayBlanker blanker = new DisplayBlanker() {
- @Override
- public void requestDisplayState(int state, int brightness) {
-
- if (state == Display.STATE_OFF) {
- requestGlobalDisplayStateInternal(state, brightness);
- }
-
- callbacks.onDisplayStateChange(state);
-
- if (state != Display.STATE_OFF) {
- requestGlobalDisplayStateInternal(state, brightness);
- }
- }
- };
- private void requestGlobalDisplayStateInternal(int state, int brightness) {
- if (state == Display.STATE_UNKNOWN) {
- state = Display.STATE_ON;
- }
- if (state == Display.STATE_OFF) {
- brightness = PowerManager.BRIGHTNESS_OFF;
- } else if (brightness < 0) {
- brightness = PowerManager.BRIGHTNESS_DEFAULT;
- } else if (brightness > PowerManager.BRIGHTNESS_ON) {
- brightness = PowerManager.BRIGHTNESS_ON;
- }
-
- synchronized (mTempDisplayStateWorkQueue) {
- try {
-
-
-
- synchronized (mSyncRoot) {
- if (mGlobalDisplayState == state
- && mGlobalDisplayBrightness == brightness) {
- return;
- }
-
- Trace.traceBegin(Trace.TRACE_TAG_POWER, "requestGlobalDisplayState("
- + Display.stateToString(state)
- + ", brightness=" + brightness + ")");
- mGlobalDisplayState = state;
- mGlobalDisplayBrightness = brightness;
- applyGlobalDisplayStateLocked(mTempDisplayStateWorkQueue);
- }
-
-
-
-
-
- for (int i = 0; i < mTempDisplayStateWorkQueue.size(); i++) {
- mTempDisplayStateWorkQueue.get(i).run();
- }
- Trace.traceEnd(Trace.TRACE_TAG_POWER);
- } finally {
- mTempDisplayStateWorkQueue.clear();
- }
- }
- }
在applyGlobalDisplayStateLocked函数中获取所有的devices, 调用对应设备的requestDisplayStateLocked函数更新请求状态. 启动devices为LocalDisplayAdapter, 就会调用到该类的requestDisplayStateLocked获得runnable.- private void applyGlobalDisplayStateLocked(List<Runnable> workQueue) {
- final int count = mDisplayDevices.size();
- for (int i = 0; i < count; i++) {
- DisplayDevice device = mDisplayDevices.get(i);
- Runnable runnable = updateDisplayStateLocked(device);
- if (runnable != null) {
- workQueue.add(runnable);
- }
- }
- }
-
- private Runnable updateDisplayStateLocked(DisplayDevice device) {
-
-
- DisplayDeviceInfo info = device.getDisplayDeviceInfoLocked();
- if ((info.flags & DisplayDeviceInfo.FLAG_NEVER_BLANK) == 0) {
- return device.requestDisplayStateLocked(mGlobalDisplayState, mGlobalDisplayBrightness);
- }
- return null;
- }
在requestDisplayStateLocked中主要的任务就是创建一个runnable返回到DisplayManagerService中,并且等待回调run函数.
- @Override
- public Runnable requestDisplayStateLocked(final int state, final int brightness) {
-
- assert state != Display.STATE_OFF || brightness == PowerManager.BRIGHTNESS_OFF;
-
- final boolean stateChanged = (mState != state);
- final boolean brightnessChanged = (mBrightness != brightness) && mBacklight != null;
- if (stateChanged || brightnessChanged) {
- final int displayId = mBuiltInDisplayId;
- final IBinder token = getDisplayTokenLocked();
- final int oldState = mState;
-
- if (stateChanged) {
- mState = state;
- updateDeviceInfoLocked();
- }
-
- if (brightnessChanged) {
- mBrightness = brightness;
- }
-
-
-
-
- return new Runnable() {
- @Override
- public void run() {
-
- int currentState = oldState;
- if (Display.isSuspendedState(oldState)
- || oldState == Display.STATE_UNKNOWN) {
- if (!Display.isSuspendedState(state)) {
- setDisplayState(state);
- currentState = state;
- } else if (state == Display.STATE_DOZE_SUSPEND
- || oldState == Display.STATE_DOZE_SUSPEND) {
- setDisplayState(Display.STATE_DOZE);
- currentState = Display.STATE_DOZE;
- } else {
- return;
- }
- }
-
-
- if (brightnessChanged) {
- if (isPowerDebug()) {
- Slog.d(TAG, "set display brightness=" + brightness);
- }
- setDisplayBrightness(brightness);
- }
-
-
- if (state != currentState) {
- if(isPowerDebug()) {
- Slog.d(TAG, "set display state=" + state);
- }
- setDisplayState(state);
- }
- }
- private void setDisplayBrightness(int brightness) {
- if (DEBUG) {
- Slog.d(TAG, "setDisplayBrightness("
- + "id=" + displayId + ", brightness=" + brightness + ")");
- }
-
- Trace.traceBegin(Trace.TRACE_TAG_POWER, "setDisplayBrightness("
- + "id=" + displayId + ", brightness=" + brightness + ")");
- try {
- mBacklight.setBrightness(brightness);
- } finally {
- Trace.traceEnd(Trace.TRACE_TAG_POWER);
- }
- }
- };
- }
- return null;
- }
- @Override
- public void setBrightness(int brightness) {
- setBrightness(brightness, BRIGHTNESS_MODE_USER);
- }
-
- @Override
- public void setBrightness(int brightness, int brightnessMode) {
- synchronized (this) {
- int color = brightness & 0x000000ff;
- color = 0xff000000 | (color << 16) | (color << 8) | color;
- setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);
- }
- }
- private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {
- if (!LightsUtilsFactory.getInstance().isBatteryOpenWhenNotificationCome(mId, color)){
- if (!mLocked && (color != mColor || mode != mMode || onMS != mOnMS || offMS != mOffMS ||
- mBrightnessMode != brightnessMode)) {
- if (DEBUG || isDebugNotifyLight()) Slog.v(TAG, "setLight #" + mId + ": color=#"
- + Integer.toHexString(color) + ": brightnessMode=" + brightnessMode);
- mLastColor = mColor;
- mColor = color;
- mMode = mode;
- mOnMS = onMS;
- mOffMS = offMS;
- mLastBrightnessMode = mBrightnessMode;
- mBrightnessMode = brightnessMode;
- Trace.traceBegin(Trace.TRACE_TAG_POWER, "setLight(" + mId + ", 0x"
- + Integer.toHexString(color) + ")");
- try {
- setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);
- } finally {
- Trace.traceEnd(Trace.TRACE_TAG_POWER);
- }
- }
- }
- }
通过JNI调用com_android_server_lights_LightsService.cpp的setLight_native函数- static void setLight_native(JNIEnv* , jobject , jlong ptr,
- jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode)
- {
- Devices* devices = (Devices*)ptr;
- light_state_t state;
-
- if (light < 0 || light >= LIGHT_COUNT || devices->lights[light] == NULL) {
- return ;
- }
-
- uint32_t version = devices->lights[light]->common.version;
-
- memset(&state, 0, sizeof(light_state_t));
-
- if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
- if (light != LIGHT_INDEX_BACKLIGHT) {
- ALOGE("Cannot set low-persistence mode for non-backlight device.");
- return;
- }
- if (version < LIGHTS_DEVICE_API_VERSION_2_0) {
-
- return;
- }
- } else {
-
- state.color = colorARGB;
- state.flashMode = flashMode;
- state.flashOnMS = onMS;
- state.flashOffMS = offMS;
- }
-
- state.brightnessMode = brightnessMode;
-
- {
- ALOGD_IF_SLOW(50, "Excessive delay setting light");
- devices->lights[light]->set_light(devices->lights[light], &state);
- }
- }
之后调用BSP向亮度节点写入亮度值. 从而点亮屏幕.
灭屏流程分析
灭屏总览
在点击power键灭屏过程中,主要流程就是input对按键事件的传输,传送到上层处理。在PhoneWindowManager中判断是否为灭屏事件, 之后就是在power中进行对亮屏状态的处理,计算一系列的数值,并且与AMS,WMS等模块进行交互,最后调用底层LCD进行最终的设备状态与亮度的设置。灭屏流程与亮屏流程有很多共同流程,在这里只讲解灭屏的独特流程。
当wakefulness状态发生改变,AMS收到通知。如果亮屏操作,AMS就会通过函数comeOutOfSleepIfNeedLocked调用到ActivityStackSupervisor中,将sleep超时消息移除,如果抓的有partial锁,就将其释放,最后将在栈顶的activity显示出来。
当亮屏时通过InputManagerService将当前屏幕状态传入JNI中进行记录,当再次发生power键事件可以方便确认该事件是需要亮屏还是灭屏。
灭屏时首先在Notifier中通过PhoneWindowManager来通知keyguard系统开始灭屏。
灭屏动画
在PowerManagerService中获得屏幕的请求状态为OFF,即设置state为Display.STATE_OFF,在这里将performScreenOffTransition为true。
- case DisplayPowerRequest.POLICY_OFF:
- state = Display.STATE_OFF;
- performScreenOffTransition = true;
- break;
调用animateScreenStateChange进行处理屏幕状态。-
-
-
- animateScreenStateChange(state, performScreenOffTransition);
- state = mPowerState.getScreenState();
如果目标亮度不为STATE_ON,STATE_DOZE,STATE_DOZE_SUSPEND屏幕就要去睡眠了。-
- mPendingScreenOff = true;
- if (mPowerState.getColorFadeLevel() == 0.0f) {
-
-
- setScreenState(Display.STATE_OFF);
- mPendingScreenOff = false;
- mPowerState.dismissColorFadeResources();
- } else if (performScreenOffTransition
- && mPowerState.prepareColorFade(mContext,
- mColorFadeFadesConfig ?
- ColorFade.MODE_FADE : ColorFade.MODE_COOL_DOWN)
- && mPowerState.getScreenState() != Display.STATE_OFF) {
-
- mColorFadeOffAnimator.start();
- } else {
-
-
- mColorFadeOffAnimator.end();
- }
在这里就要判断ColorFadeLevel是不是0.0,由于亮屏时将ColorFadeLevel设置为1.0所以走else语句,如果performScreenOffTransition为true并且将ColorFade准备好了就开始灭屏动画将ColorFadeLevel从1.0渐变为0.0。但是前面知道将performScreenOffTransition设置为了false,所以就没有了灭屏动画,直接将ColorFadeLevel设置为0.0。之后就调用setScreenState设置状态。发送灭屏广播 power是通过WindowManagerPolicy与PhoneWindowManager进行交互,当屏幕在finishedGoingToSleep时需要通知window进行更新手势监听,更新方向监听,更新锁屏超时时间。之后发送灭屏广播通知关心灭屏事件的模块。
到此为止亮灭屏流程讲解完毕.