Android Input流程分析（三）：InputReader

其他 2018-05-07 12:18:09 阅读次数: 6

  回到InputReader的loopOnce函数。
  现在getEvents捞上来的RawEvent均保存在mEventBuffer中。

/native/services/inputflinger/InputReader.cpp

void InputReader::loopOnce() {
    int32_t oldGeneration;
    int32_t timeoutMillis;
    bool inputDevicesChanged = false;
    Vector<InputDeviceInfo> inputDevices;
    { // acquire lock
        AutoMutex _l(mLock);

        oldGeneration = mGeneration;
        timeoutMillis = -1;

        uint32_t changes = mConfigurationChangesToRefresh;
        if (changes) {
            mConfigurationChangesToRefresh = 0;
            timeoutMillis = 0;
            refreshConfigurationLocked(changes);
        } else if (mNextTimeout != LLONG_MAX) {
            nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
            timeoutMillis = toMillisecondTimeoutDelay(now, mNextTimeout);
        }
    } // release lock

    size_t count = mEventHub->getEvents(timeoutMillis, mEventBuffer, EVENT_BUFFER_SIZE);

    { // acquire lock
        AutoMutex _l(mLock);
        mReaderIsAliveCondition.broadcast();

        if (count) {
            processEventsLocked(mEventBuffer, count);
        }

        if (mNextTimeout != LLONG_MAX) {
            nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
            if (now >= mNextTimeout) {
#if DEBUG_RAW_EVENTS
                ALOGD("Timeout expired, latency=%0.3fms", (now - mNextTimeout) * 0.000001f);
#endif
                mNextTimeout = LLONG_MAX;
                timeoutExpiredLocked(now);
            }
        }

        if (oldGeneration != mGeneration) {
            inputDevicesChanged = true;
            getInputDevicesLocked(inputDevices);
        }
    } // release lock

    // Send out a message that the describes the changed input devices.
    if (inputDevicesChanged) {
        mPolicy->notifyInputDevicesChanged(inputDevices);
    }

    // Flush queued events out to the listener.
    // This must happen outside of the lock because the listener could potentially call
    // back into the InputReader's methods, such as getScanCodeState, or become blocked
    // on another thread similarly waiting to acquire the InputReader lock thereby
    // resulting in a deadlock.  This situation is actually quite plausible because the
    // listener is actually the input dispatcher, which calls into the window manager,
    // which occasionally calls into the input reader.
    mQueuedListener->flush();
}

  timeoutMillis决定了getEvent时poll的等待时间，默认为-1（poll会一致阻塞到有事件发生），若设备配置改变，则为0（立刻返回），键盘事件处理过程中mNextTimeout不是-1就是0，不会出现 timeoutMillis为now和mNextTimeout时间差的情况。
  遍历mEventBuffer中所有的RawEvent。
  若发生的事件为设备增删事件（rawEvent[batchSize].type >= EventHubInterface::FIRST_SYNTHETIC_EVENT），则逐一地处理事件，每处理完一件，count减1，rawEvent指针向前移动一格。若发生的是设备传送数据事件，则分批收集属于同一设备的数据传送事件去处理。
  下图是mEventBuffer数组中一段的可能分布。对于设备增加，卸载和扫描完成事件，都是单独使用独立的函数进行处理的。对于设备数据传送事件,以设备id相同的连续RawEvent构成一个数组作为processEventsForDeviceLocked的rawEvent参数传入，数组的元素数量作为参数batchSize传入。 

void InputReader::processEventsLocked(const RawEvent* rawEvents, size_t count) {
    for (const RawEvent* rawEvent = rawEvents; count;) {
        int32_t type = rawEvent->type;
        size_t batchSize = 1;
        if (type < EventHubInterface::FIRST_SYNTHETIC_EVENT) {
            int32_t deviceId = rawEvent->deviceId;
            while (batchSize < count) {
                if (rawEvent[batchSize].type >= EventHubInterface::FIRST_SYNTHETIC_EVENT
                        || rawEvent[batchSize].deviceId != deviceId) {
                    break;
                }
                batchSize += 1;
            }
#if DEBUG_RAW_EVENTS
            ALOGD("BatchSize: %d Count: %d", batchSize, count);
#endif
            processEventsForDeviceLocked(deviceId, rawEvent, batchSize);
        } else {
            switch (rawEvent->type) {
            case EventHubInterface::DEVICE_ADDED:
                addDeviceLocked(rawEvent->when, rawEvent->deviceId);
                break;
            case EventHubInterface::DEVICE_REMOVED:
                removeDeviceLocked(rawEvent->when, rawEvent->deviceId);
                break;
            case EventHubInterface::FINISHED_DEVICE_SCAN:
                handleConfigurationChangedLocked(rawEvent->when);
                break;
            default:
                ALOG_ASSERT(false); // can't happen
                break;
            }
        }
        count -= batchSize;
        rawEvent += batchSize;
    }
}

  第一次进入processEventsLocked函数走的必然是设备增加事件处理流程。首先获得EventHub::Device对应的InputDeviceIdentifier，classes和controllerNumber等成员信息来构造一个InputDevice。

/native/services/inputflinger/InputReader.cpp

void InputReader::addDeviceLocked(nsecs_t when, int32_t deviceId) {
    ssize_t deviceIndex = mDevices.indexOfKey(deviceId);
    if (deviceIndex >= 0) {
        ALOGW("Ignoring spurious device added event for deviceId %d.", deviceId);
        return;
    }

    InputDeviceIdentifier identifier = mEventHub->getDeviceIdentifier(deviceId);
    uint32_t classes = mEventHub->getDeviceClasses(deviceId);
    int32_t controllerNumber = mEventHub->getDeviceControllerNumber(deviceId);

    InputDevice* device = createDeviceLocked(deviceId, controllerNumber, identifier, classes);
    device->configure(when, &mConfig, 0);//配置Device的策略
    device->reset(when);//重置Device

    if (device->isIgnored()) {
        ALOGI("Device added: id=%d, name='%s' (ignored non-input device)", deviceId,
                identifier.name.string());
    } else {
        ALOGI("Device added: id=%d, name='%s', sources=0x%08x", deviceId,
                identifier.name.string(), device->getSources());
    }

    mDevices.add(deviceId, device);//添加id-InputDevice*键值对到mDevices中
    bumpGenerationLocked();

    if (device->getClasses() & INPUT_DEVICE_CLASS_EXTERNAL_STYLUS) {
        notifyExternalStylusPresenceChanged();
    }
}

/native/services/inputflinger/InputReader.cpp

InputDevice* InputReader::createDeviceLocked(int32_t deviceId, int32_t controllerNumber,
        const InputDeviceIdentifier& identifier, uint32_t classes) {
    InputDevice* device = new InputDevice(&mContext, deviceId, bumpGenerationLocked(),
            controllerNumber, identifier, classes);
    ...
    // Keyboard-like devices.
    uint32_t keyboardSource = 0;
    int32_t keyboardType = AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC;
    if (classes & INPUT_DEVICE_CLASS_KEYBOARD) {
        keyboardSource |= AINPUT_SOURCE_KEYBOARD;
    }
    ...
    if (keyboardSource != 0) {
        device->addMapper(new KeyboardInputMapper(device, keyboardSource, keyboardType));
    }
    ...
    return device;
}

  InputDevice中有一个类型为Vector

void InputDevice::addMapper(InputMapper* mapper) {
    mMappers.add(mapper);
}

  这样便完成了设备的增加事件处理流程。接下来讲下事件传送事件的处理（先跳过扫描完成事件）。

/native/services/inputflinger/InputReader.cpp

void InputReader::processEventsForDeviceLocked(int32_t deviceId,
        const RawEvent* rawEvents, size_t count) {
    ssize_t deviceIndex = mDevices.indexOfKey(deviceId);
    if (deviceIndex < 0) {
        ALOGW("Discarding event for unknown deviceId %d.", deviceId);
        return;
    }

    InputDevice* device = mDevices.valueAt(deviceIndex);
    if (device->isIgnored()) {
        //ALOGD("Discarding event for ignored deviceId %d.", deviceId);
        return;
    }

    device->process(rawEvents, count);
}

  processEventsForDeviceLocked中调用了InputDevice::process函数。这个函数中对每一个RawEvent,都会调用mMappers中的每一个InputMapper的process函数去处理它。

/native/services/inputflinger/InputReader.cpp

void InputDevice::process(const RawEvent* rawEvents, size_t count) {
    // Process all of the events in order for each mapper.
    // We cannot simply ask each mapper to process them in bulk because mappers may
    // have side-effects that must be interleaved.  For example, joystick movement events and
    // gamepad button presses are handled by different mappers but they should be dispatched
    // in the order received.
    size_t numMappers = mMappers.size();
    for (const RawEvent* rawEvent = rawEvents; count--; rawEvent++) {
#if DEBUG_RAW_EVENTS
        ALOGD("Input event: device=%d type=0x%04x code=0x%04x value=0x%08x when=%lld",
                rawEvent->deviceId, rawEvent->type, rawEvent->code, rawEvent->value,
                rawEvent->when);
#endif

        if (mDropUntilNextSync) {
            if (rawEvent->type == EV_SYN && rawEvent->code == SYN_REPORT) {
                mDropUntilNextSync = false;
#if DEBUG_RAW_EVENTS
                ALOGD("Recovered from input event buffer overrun.");
#endif
            } else {
#if DEBUG_RAW_EVENTS
                ALOGD("Dropped input event while waiting for next input sync.");
#endif
            }
        } else if (rawEvent->type == EV_SYN && rawEvent->code == SYN_DROPPED) {
            ALOGI("Detected input event buffer overrun for device %s.", getName().string());
            mDropUntilNextSync = true;
            reset(rawEvent->when);
        } else {
            for (size_t i = 0; i < numMappers; i++) {
                InputMapper* mapper = mMappers[i];
                mapper->process(rawEvent);
            }
        }
    }
}

  以KeyboardInputMapper为例进行介绍。在前面可以看到，要拥有KeyboardInputMapper，设备必须要属于这四个类型：INPUT_DEVICE_CLASS_KEYBOARD，INPUT_DEVICE_CLASS_ALPHAKEY，INPUT_DEVICE_CLASS_DPAD和INPUT_DEVICE_CLASS_GAMEPAD。如果原始输入事件类型为EV_KEY，先检查是否是键盘或游戏手柄的扫描码，如果是，则使用mapkey获得对应的键值码和flag。这些值将作为processKey的入参做最后的处理。

/native/services/inputflinger/InputReader.cpp

void KeyboardInputMapper::process(const RawEvent* rawEvent) {
    switch (rawEvent->type) {
    case EV_KEY: {
        int32_t scanCode = rawEvent->code;//扫描码
        int32_t usageCode = mCurrentHidUsage;
        mCurrentHidUsage = 0;

        if (isKeyboardOrGamepadKey(scanCode)) {
            int32_t keyCode;
            uint32_t flags;
            if (getEventHub()->mapKey(getDeviceId(), scanCode, usageCode, &keyCode, &flags)) {
                keyCode = AKEYCODE_UNKNOWN;
                flags = 0;
            }
            processKey(rawEvent->when, rawEvent->value != 0, keyCode, scanCode, flags);
        }
        break;
    }
    case EV_MSC: {
        if (rawEvent->code == MSC_SCAN) {
            mCurrentHidUsage = rawEvent->value;
        }
        break;
    }
    case EV_SYN: {
        if (rawEvent->code == SYN_REPORT) {
            mCurrentHidUsage = 0;
        }
    }
    }
}

  mapKey函数先去尝试从在已经保存在Device的KeyMap成员的CharacterMap。KeyCharacterMap::mapkey函数根据传入的扫描码（scanCode），找到对应的键值码，结果存放在outKeycode中，同时传入的outFlags表示的标志位置0。若没有对应的KeyCharacterMap，则尝试去加载keyLayoutMap。KeyLayoutMap::mapKey函数根据传入的扫描码（scanCode）,找到对应的键值码，结果存放在outKeycode中，outFlags
表示的标志位会被设为KeyLayoutMap中保存的flag。
/frameworks/native/services/inputflinger/EventHub.cpp

status_t EventHub::mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
        int32_t* outKeycode, uint32_t* outFlags) const {
    AutoMutex _l(mLock);
    Device* device = getDeviceLocked(deviceId);

    if (device) {
        // Check the key character map first.
        sp<KeyCharacterMap> kcm = device->getKeyCharacterMap();//获得保存的KeyCharacterMap
        if (kcm != NULL) {
            if (!kcm->mapKey(scanCode, usageCode, outKeycode)) {
                *outFlags = 0;
                return NO_ERROR;
            }
        }

        // Check the key layout next.
        if (device->keyMap.haveKeyLayout()) {//获得保存的keyLayoutMap
            if (!device->keyMap.keyLayoutMap->mapKey(
                    scanCode, usageCode, outKeycode, outFlags)) {
                return NO_ERROR;
            }
        }
    }

    *outKeycode = 0;
    *outFlags = 0;
    return NAME_NOT_FOUND;
}

/frameworks/native/libs/input/KeyCharacterMap.cpp

status_t KeyCharacterMap::mapKey(int32_t scanCode, int32_t usageCode, int32_t* outKeyCode) const {
    if (usageCode) {
        ssize_t index = mKeysByUsageCode.indexOfKey(usageCode);
        if (index >= 0) {
#if DEBUG_MAPPING
    ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Result keyCode=%d.",
            scanCode, usageCode, *outKeyCode);
#endif
            *outKeyCode = mKeysByUsageCode.valueAt(index);
            return OK;
        }
    }
    if (scanCode) {
        ssize_t index = mKeysByScanCode.indexOfKey(scanCode);
        if (index >= 0) {
#if DEBUG_MAPPING
    ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Result keyCode=%d.",
            scanCode, usageCode, *outKeyCode);
#endif
            *outKeyCode = mKeysByScanCode.valueAt(index);
            return OK;
        }
    }

#if DEBUG_MAPPING
        ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Failed.", scanCode, usageCode);
#endif
    *outKeyCode = AKEYCODE_UNKNOWN;
    return NAME_NOT_FOUND;
}

/frameworks/native/libs/input/KeyLayoutMap.cpp

status_t KeyLayoutMap::mapKey(int32_t scanCode, int32_t usageCode,
        int32_t* outKeyCode, uint32_t* outFlags) const {
    const Key* key = getKey(scanCode, usageCode);
    if (!key) {
#if DEBUG_MAPPING
        ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Failed.", scanCode, usageCode);
#endif
        *outKeyCode = AKEYCODE_UNKNOWN;
        *outFlags = 0;
        return NAME_NOT_FOUND;
    }

    *outKeyCode = key->keyCode;
    *outFlags = key->flags;

#if DEBUG_MAPPING
    ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Result keyCode=%d, outFlags=0x%08x.",
            scanCode, usageCode, *outKeyCode, *outFlags);
#endif
    return NO_ERROR;
}

const KeyLayoutMap::Key* KeyLayoutMap::getKey(int32_t scanCode, int32_t usageCode) const {
    if (usageCode) {
        ssize_t index = mKeysByUsageCode.indexOfKey(usageCode);
        if (index >= 0) {
            return &mKeysByUsageCode.valueAt(index);
        }
    }
    if (scanCode) {
        ssize_t index = mKeysByScanCode.indexOfKey(scanCode);
        if (index >= 0) {
            return &mKeysByScanCode.valueAt(index);
        }
    }
    return NULL;
}

  来看看processKey。down的值为RawEvent的code值，若不为0，表示该事件为按键按下的事件。如果是按下事件，首先根据屏幕的方向对键码值进行旋转变换。findKeyDown从 InputReader的Vector< KeyDown>类型成员mKeyDowns查找与scanCode对应的KeyDown。KeyDown是一个结构体，持有扫描码scanCode和对应的键值码keyCode两个成员。如果mKeyDowns里面找到了对应的KeyDown，说明发生了重复按键事件，使用这个KeyDown中的键码值。如果mKeyDowns里面没有找到对应的KeyDown，则在mKeyDowns中插入一个新的KeyDown。进入processKey函数时，mKeyDowns不一定为空，因为此时有其他的按键已经被按下还没释放。
  当按键抬起时，则在mKeyDowns中移除对应的KeyDown。

/native/services/inputflinger/InputReader.cpp

void KeyboardInputMapper::processKey(nsecs_t when, bool down, int32_t keyCode,
        int32_t scanCode, uint32_t policyFlags) {

    if (down) {
        // Rotate key codes according to orientation if needed.
        if (mParameters.orientationAware && mParameters.hasAssociatedDisplay) {
            keyCode = rotateKeyCode(keyCode, mOrientation);//根据屏幕的方向对键码值进行旋转变换
        }

        // Add key down.
        ssize_t keyDownIndex = findKeyDown(scanCode);
        if (keyDownIndex >= 0) {
            // key repeat, be sure to use same keycode as before in case of rotation
            keyCode = mKeyDowns.itemAt(keyDownIndex).keyCode;
        } else {
            // key down
            if ((policyFlags & POLICY_FLAG_VIRTUAL)
                    && mContext->shouldDropVirtualKey(when,
                            getDevice(), keyCode, scanCode)) {
                return;
            }
            if (policyFlags & POLICY_FLAG_GESTURE) {
                mDevice->cancelTouch(when);
            }

            mKeyDowns.push();
            KeyDown& keyDown = mKeyDowns.editTop();
            keyDown.keyCode = keyCode;
            keyDown.scanCode = scanCode;
        }

        mDownTime = when;
    } else {
        // Remove key down.
        ssize_t keyDownIndex = findKeyDown(scanCode);
        if (keyDownIndex >= 0) {
            // key up, be sure to use same keycode as before in case of rotation
            keyCode = mKeyDowns.itemAt(keyDownIndex).keyCode;
            mKeyDowns.removeAt(size_t(keyDownIndex));
        } else {
            // key was not actually down
            ALOGI("Dropping key up from device %s because the key was not down.  "
                    "keyCode=%d, scanCode=%d",
                    getDeviceName().string(), keyCode, scanCode);
            return;
        }
    }

    int32_t oldMetaState = mMetaState;
    int32_t newMetaState = updateMetaState(keyCode, down, oldMetaState);
    bool metaStateChanged = oldMetaState != newMetaState;
    if (metaStateChanged) {
        mMetaState = newMetaState;
        updateLedState(false);
    }

    nsecs_t downTime = mDownTime;

    // Key down on external an keyboard should wake the device.
    // We don't do this for internal keyboards to prevent them from waking up in your pocket.
    // For internal keyboards, the key layout file should specify the policy flags for
    // each wake key individually.
    // TODO: Use the input device configuration to control this behavior more finely.
    if (down && getDevice()->isExternal()) {
        policyFlags |= POLICY_FLAG_WAKE;
    }

    if (mParameters.handlesKeyRepeat) {
        policyFlags |= POLICY_FLAG_DISABLE_KEY_REPEAT;
    }

    if (metaStateChanged) {
        getContext()->updateGlobalMetaState();
    }

    if (down && !isMetaKey(keyCode)) {
        getContext()->fadePointer();
    }

    NotifyKeyArgs args(when, getDeviceId(), mSource, policyFlags,
            down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP,
            AKEY_EVENT_FLAG_FROM_SYSTEM, keyCode, scanCode, newMetaState, downTime);
    getListener()->notifyKey(&args);
}

/frameworks/native/services/inputflinger/InputReader.h

struct KeyDown {
        int32_t keyCode;
        int32_t scanCode;
    };

  之后根据旧的metaState获得新的metaState。若某个键码值对应的键被按下，newMetaState对应的的标志位置1。若该键被释放，则取消AMETA_ALT_ON ，AMETA_SHIFT_ON ， AMETA_CTRL_ON ， AMETA_META_ON和原来按下时设定的标志位。

/frameworks/native/libs/input/Keyboard.cpp

int32_t updateMetaState(int32_t keyCode, bool down, int32_t oldMetaState) {
    int32_t mask;
    switch (keyCode) {
    case AKEYCODE_ALT_LEFT:
        return setEphemeralMetaState(AMETA_ALT_LEFT_ON, down, oldMetaState);
    case AKEYCODE_ALT_RIGHT:
        return setEphemeralMetaState(AMETA_ALT_RIGHT_ON, down, oldMetaState);
    case AKEYCODE_SHIFT_LEFT:
        return setEphemeralMetaState(AMETA_SHIFT_LEFT_ON, down, oldMetaState);
    case AKEYCODE_SHIFT_RIGHT:
        return setEphemeralMetaState(AMETA_SHIFT_RIGHT_ON, down, oldMetaState);
    case AKEYCODE_SYM:
        return setEphemeralMetaState(AMETA_SYM_ON, down, oldMetaState);
    case AKEYCODE_FUNCTION:
        return setEphemeralMetaState(AMETA_FUNCTION_ON, down, oldMetaState);
    case AKEYCODE_CTRL_LEFT:
        return setEphemeralMetaState(AMETA_CTRL_LEFT_ON, down, oldMetaState);
    case AKEYCODE_CTRL_RIGHT:
        return setEphemeralMetaState(AMETA_CTRL_RIGHT_ON, down, oldMetaState);
    case AKEYCODE_META_LEFT:
        return setEphemeralMetaState(AMETA_META_LEFT_ON, down, oldMetaState);
    case AKEYCODE_META_RIGHT:
        return setEphemeralMetaState(AMETA_META_RIGHT_ON, down, oldMetaState);
    case AKEYCODE_CAPS_LOCK:
        return toggleLockedMetaState(AMETA_CAPS_LOCK_ON, down, oldMetaState);
    case AKEYCODE_NUM_LOCK:
        return toggleLockedMetaState(AMETA_NUM_LOCK_ON, down, oldMetaState);
    case AKEYCODE_SCROLL_LOCK:
        return toggleLockedMetaState(AMETA_SCROLL_LOCK_ON, down, oldMetaState);
    default:
        return oldMetaState;
    }
}

/frameworks/native/libs/input/Keyboard.cpp

static int32_t setEphemeralMetaState(int32_t mask, bool down, int32_t oldMetaState) {
    int32_t newMetaState;
    if (down) {
        newMetaState = oldMetaState | mask;
    } else {
        newMetaState = oldMetaState &
                ~(mask | AMETA_ALT_ON | AMETA_SHIFT_ON | AMETA_CTRL_ON | AMETA_META_ON);
    }

    if (newMetaState & (AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON)) {
        newMetaState |= AMETA_ALT_ON;
    }

    if (newMetaState & (AMETA_SHIFT_LEFT_ON | AMETA_SHIFT_RIGHT_ON)) {
        newMetaState |= AMETA_SHIFT_ON;
    }

    if (newMetaState & (AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON)) {
        newMetaState |= AMETA_CTRL_ON;
    }

    if (newMetaState & (AMETA_META_LEFT_ON | AMETA_META_RIGHT_ON)) {
        newMetaState |= AMETA_META_ON;
    }
    return newMetaState;
}

  最后一步，将一些信息封装成一个NotifyKeyArgs对象。getListener函数返回的是一个InputDispatcher对象，调用其notifyKey函数。
  至此，流程走到了InputDispatcher这边。

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