和菜鸟一起学android4.0.3源码之touchscreen配置+调试记录 .

记得应该是上上周了，终于毕业了，离开了学校，就得面对现实的社会，以前学校实验室里，老师给了钥匙，那电脑随便用，那元器件随便玩，什么51单片机啊，PIC单片机啊，FPGA啊，arm11啊什么的。想着做什么就直接万用版+电烙铁什么的一起搞定。调试，写程序，焊板子都是自己一手操办啊，多么自由啊。到了公司，可不依你，对于上市公司来说，管理什么的总归还是有些规范化的。
        对于嵌入式，虽然早有所耳闻，大三也玩过arm7，编了几个基于GUI的贪吃蛇啊，黑白棋啊，连连看啊什么的。自己也买来arm11，烧写linux系统，搭建环境，最终也成功完成了hello world驱动模块。待以后有时间再好好整理整理。废话不多说了，既然是anrdroid下的touchscreen的配置，那就专心点，不东扯西扯了。
     都说android4.0.3的touchscreen有了很大的变化，菜鸟也不知道这么庞大的代码，各个功能模块式干嘛的。只能找找资料，瞎折腾了。公司的任务，触摸屏得上了，android的东西，只用鼠标可不好玩啊。开始调试SPI模式的ads7846的电阻屏，板子没有SPI接口，于是就用GPIO模拟SPI的方式来实现SPI的功能，在此要说明下，这个嵌入式的板子就是和51，PIC的板子用起来不一样啊，什么工作队列，什么中断下半部分工作，什么总线啊，I2C啊，SPI啊，I2S啊，USB啊，都这么纠结，顿时觉得学得好少啊，自己又有点懒，什么都想学，至于什么也没学好。调试好驱动后，总算是完成了一半的工作，接着，是否要直接上android去跑呢？android里什么机制都不知道额，虽然一开始android中实现鼠标的时候小研究过android下的input那个框架，不过只是模模糊糊的概念，根本就没有弄清楚。看来得下点功夫啊，要不然怎么混啊。又偏题了，额，正题，正题。。
         直接上android了，突然发现出现了一个小圈圈。向鼠标一样的。貌似触摸屏变成了鼠标了。觉得太怪了，怎么可以这样？肯定那里有问题的，找了好久的资料，终于找到了，原来是android4.0.3，他的touchscreen是需要配置文件的。只要直接创建一个“设备名.idc”的文件，直接放到/system/usr/idc/目录下，就可以了，设备名是驱动中定义的，在android中的Eventhub中也是可以加打印在logcat中看出来的。

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# Basic Parameters
touch.deviceType = touchScreen
touch.orientationAware = 1
# Size
touch.size.calibration = diameter
touch.size.scale = 10
touch.size.bias = 0
touch.size.isSummed = 0
# Pressure
# Driver reports signal strength as pressure.
#
# A normal thumb touch typically registers about 200 signal strength
# units although we don't expect these values to be accurate.
touch.pressure.calibration = amplitude
touch.pressure.scale = 0.005
# Orientation
touch.orientation.calibration = none

 # Basic Parameters
   touch.deviceType = touchScreen
   touch.orientationAware = 1

   # Size
   touch.size.calibration = diameter
   touch.size.scale = 10
   touch.size.bias = 0
   touch.size.isSummed = 0

   # Pressure
   # Driver reports signal strength as pressure.
   #
   # A normal thumb touch typically registers about 200 signal strength
   # units although we don't expect these values to be accurate.
   touch.pressure.calibration = amplitude
   touch.pressure.scale = 0.005

   # Orientation
   touch.orientation.calibration = none

但是就知道了这个配置文件，具体那里实现的呢？怎么配置进去的呢？怎么看着你个是touch.deviceType = touchScreen这个决定的。不多说来代码
frameworks/base/services/input/InputReader.cpp

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void TouchInputMapper::configureParameters() {
// Use the pointer presentation mode for devices that do not support distinct
// multitouch. The spot-based presentation relies on being able to accurately
// locate two or more fingers on the touch pad.
mParameters.gestureMode = getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_SEMI_MT)
? Parameters::GESTURE_MODE_POINTER : Parameters::GESTURE_MODE_SPOTS;
String8 gestureModeString;
if (getDevice()->getConfiguration().tryGetProperty(String8("touch.gestureMode"),
gestureModeString)) {
if (gestureModeString == "pointer") {
mParameters.gestureMode = Parameters::GESTURE_MODE_POINTER;
} else if (gestureModeString == "spots") {
mParameters.gestureMode = Parameters::GESTURE_MODE_SPOTS;
} else if (gestureModeString != "default") {
LOGW("Invalid value for touch.gestureMode: '%s'", gestureModeString.string());
}
}
if (getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_DIRECT)) {
// The device is a touch screen.
mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_SCREEN;
} else if (getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_POINTER)) {
// The device is a pointing device like a track pad.
mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
} else if (getEventHub()->hasRelativeAxis(getDeviceId(), REL_X)
|| getEventHub()->hasRelativeAxis(getDeviceId(), REL_Y)) {
// The device is a cursor device with a touch pad attached.
// By default don't use the touch pad to move the pointer.
mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_PAD;
} else {
// The device is a touch pad of unknown purpose.
mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
}
String8 deviceTypeString;
if (getDevice()->getConfiguration().tryGetProperty(String8("touch.deviceType"),
deviceTypeString)) {
if (deviceTypeString == "touchScreen") {
mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_SCREEN;
} else if (deviceTypeString == "touchPad") {
mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_PAD;
} else if (deviceTypeString == "pointer") {
mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
} else if (deviceTypeString != "default") {
LOGW("Invalid value for touch.deviceType: '%s'", deviceTypeString.string());
}
}
mParameters.orientationAware = mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN;
getDevice()->getConfiguration().tryGetProperty(String8("touch.orientationAware"),
mParameters.orientationAware);
mParameters.associatedDisplayId = -1;
mParameters.associatedDisplayIsExternal = false;
if (mParameters.orientationAware
|| mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN
|| mParameters.deviceType == Parameters::DEVICE_TYPE_POINTER) {
mParameters.associatedDisplayIsExternal =
mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN
&& getDevice()->isExternal();
mParameters.associatedDisplayId = 0;
}
}

void TouchInputMapper::configureParameters() {
    // Use the pointer presentation mode for devices that do not support distinct
    // multitouch.  The spot-based presentation relies on being able to accurately
    // locate two or more fingers on the touch pad.
    mParameters.gestureMode = getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_SEMI_MT)
            ? Parameters::GESTURE_MODE_POINTER : Parameters::GESTURE_MODE_SPOTS;

    String8 gestureModeString;
    if (getDevice()->getConfiguration().tryGetProperty(String8("touch.gestureMode"),
            gestureModeString)) {
        if (gestureModeString == "pointer") {
            mParameters.gestureMode = Parameters::GESTURE_MODE_POINTER;
        } else if (gestureModeString == "spots") {
            mParameters.gestureMode = Parameters::GESTURE_MODE_SPOTS;
        } else if (gestureModeString != "default") {
            LOGW("Invalid value for touch.gestureMode: '%s'", gestureModeString.string());
        }
    }

    if (getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_DIRECT)) {
        // The device is a touch screen.
        mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_SCREEN;
    } else if (getEventHub()->hasInputProperty(getDeviceId(), INPUT_PROP_POINTER)) {
        // The device is a pointing device like a track pad.
        mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
    } else if (getEventHub()->hasRelativeAxis(getDeviceId(), REL_X)
            || getEventHub()->hasRelativeAxis(getDeviceId(), REL_Y)) {
        // The device is a cursor device with a touch pad attached.
        // By default don't use the touch pad to move the pointer.
        mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_PAD;
    } else {
        // The device is a touch pad of unknown purpose.
        mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
    }

    String8 deviceTypeString;
    if (getDevice()->getConfiguration().tryGetProperty(String8("touch.deviceType"),
            deviceTypeString)) {
        if (deviceTypeString == "touchScreen") {
            mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_SCREEN;
        } else if (deviceTypeString == "touchPad") {
            mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_PAD;
        } else if (deviceTypeString == "pointer") {
            mParameters.deviceType = Parameters::DEVICE_TYPE_POINTER;
        } else if (deviceTypeString != "default") {
            LOGW("Invalid value for touch.deviceType: '%s'", deviceTypeString.string());
        }
    }

    mParameters.orientationAware = mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN;
    getDevice()->getConfiguration().tryGetProperty(String8("touch.orientationAware"),
            mParameters.orientationAware);

    mParameters.associatedDisplayId = -1;
    mParameters.associatedDisplayIsExternal = false;
    if (mParameters.orientationAware
            || mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN
            || mParameters.deviceType == Parameters::DEVICE_TYPE_POINTER) {
        mParameters.associatedDisplayIsExternal =
                mParameters.deviceType == Parameters::DEVICE_TYPE_TOUCH_SCREEN
                        && getDevice()->isExternal();
        mParameters.associatedDisplayId = 0;
    }
}

还是英文呢，看到第一行，如果没有配置的话，那就是pointer，pointer不就是鼠标吗？只有定义deviceType为touchScreen，那才是我们要的啊。看来英文真的好重要好重

要啊。那到底是那里去获取配置文件的呢？不是一般都是EventHub下打开什么文件吗？走，咱们去seesee。
frameworks/base/services/input/EventHub.cpp

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void EventHub::loadConfigurationLocked(Device* device) {
device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
if (device->configurationFile.isEmpty()) {
LOGD("No input device configuration file found for device '%s'.",
device->identifier.name.string());
} else {
status_t status = PropertyMap::load(device->configurationFile,
&device->configuration);
if (status) {
LOGE("Error loading input device configuration file for device '%s'. "
"Using default configuration.",
device->identifier.name.string());
}
}
}

void EventHub::loadConfigurationLocked(Device* device) {
    device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
            device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
    if (device->configurationFile.isEmpty()) {
        LOGD("No input device configuration file found for device '%s'.",
                device->identifier.name.string());
    } else {
        status_t status = PropertyMap::load(device->configurationFile,
                &device->configuration);
        if (status) {
            LOGE("Error loading input device configuration file for device '%s'.  "
                    "Using default configuration.",
                    device->identifier.name.string());
        }
    }
}

原来就是这里去载入配置文件的。然后再进行配置的，接着我们看看那些配置是什么功能？上面的deviceType就不用说了，就是类型是触摸屏而不是touchPad和pointer。

pointer是鼠标类似的光标，touchPad还没试过，板子上的触摸屏也拆了，也没法跳了。不知道是什么，下次有机会去试试。差不多应该和touchScreen差不多。那么

touch.size.calibration等一些配置是什么？有什么作用呢？还是代码看起
frameworks/base/services/input/InputReader.cpp

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void TouchInputMapper::parseCalibration() {
const PropertyMap& in = getDevice()->getConfiguration();
Calibration& out = mCalibration;
// Size
out.sizeCalibration = Calibration::SIZE_CALIBRATION_DEFAULT;
String8 sizeCalibrationString;
if (in.tryGetProperty(String8("touch.size.calibration"), sizeCalibrationString)) {
if (sizeCalibrationString == "none") {
out.sizeCalibration = Calibration::SIZE_CALIBRATION_NONE;
} else if (sizeCalibrationString == "geometric") {
out.sizeCalibration = Calibration::SIZE_CALIBRATION_GEOMETRIC;
} else if (sizeCalibrationString == "diameter") {
out.sizeCalibration = Calibration::SIZE_CALIBRATION_DIAMETER;
} else if (sizeCalibrationString == "area") {
out.sizeCalibration = Calibration::SIZE_CALIBRATION_AREA;
} else if (sizeCalibrationString != "default") {
LOGW("Invalid value for touch.size.calibration: '%s'",
sizeCalibrationString.string());
}
}
out.haveSizeScale = in.tryGetProperty(String8("touch.size.scale"),
out.sizeScale);
out.haveSizeBias = in.tryGetProperty(String8("touch.size.bias"),
out.sizeBias);
out.haveSizeIsSummed = in.tryGetProperty(String8("touch.size.isSummed"),
out.sizeIsSummed);
// Pressure
out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_DEFAULT;
String8 pressureCalibrationString;
if (in.tryGetProperty(String8("touch.pressure.calibration"), pressureCalibrationString)) {
if (pressureCalibrationString == "none") {
out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_NONE;
} else if (pressureCalibrationString == "physical") {
out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_PHYSICAL;
} else if (pressureCalibrationString == "amplitude") {
out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_AMPLITUDE;
} else if (pressureCalibrationString != "default") {
LOGW("Invalid value for touch.pressure.calibration: '%s'",
pressureCalibrationString.string());
}
}
out.havePressureScale = in.tryGetProperty(String8("touch.pressure.scale"),
out.pressureScale);
// Orientation
out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_DEFAULT;
String8 orientationCalibrationString;
if (in.tryGetProperty(String8("touch.orientation.calibration"), orientationCalibrationString)) {
if (orientationCalibrationString == "none") {
out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_NONE;
} else if (orientationCalibrationString == "interpolated") {
out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_INTERPOLATED;
} else if (orientationCalibrationString == "vector") {
out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_VECTOR;
} else if (orientationCalibrationString != "default") {
LOGW("Invalid value for touch.orientation.calibration: '%s'",
orientationCalibrationString.string());
}
}
// Distance
out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_DEFAULT;
String8 distanceCalibrationString;
if (in.tryGetProperty(String8("touch.distance.calibration"), distanceCalibrationString)) {
if (distanceCalibrationString == "none") {
out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_NONE;
} else if (distanceCalibrationString == "scaled") {
out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_SCALED;
} else if (distanceCalibrationString != "default") {
LOGW("Invalid value for touch.distance.calibration: '%s'",
distanceCalibrationString.string());
}
}
out.haveDistanceScale = in.tryGetProperty(String8("touch.distance.scale"),
out.distanceScale);
}

void TouchInputMapper::parseCalibration() {
    const PropertyMap& in = getDevice()->getConfiguration();
    Calibration& out = mCalibration;

    // Size
    out.sizeCalibration = Calibration::SIZE_CALIBRATION_DEFAULT;
    String8 sizeCalibrationString;
    if (in.tryGetProperty(String8("touch.size.calibration"), sizeCalibrationString)) {
        if (sizeCalibrationString == "none") {
            out.sizeCalibration = Calibration::SIZE_CALIBRATION_NONE;
        } else if (sizeCalibrationString == "geometric") {
            out.sizeCalibration = Calibration::SIZE_CALIBRATION_GEOMETRIC;
        } else if (sizeCalibrationString == "diameter") {
            out.sizeCalibration = Calibration::SIZE_CALIBRATION_DIAMETER;
        } else if (sizeCalibrationString == "area") {
            out.sizeCalibration = Calibration::SIZE_CALIBRATION_AREA;
        } else if (sizeCalibrationString != "default") {
            LOGW("Invalid value for touch.size.calibration: '%s'",
                    sizeCalibrationString.string());
        }
    }

    out.haveSizeScale = in.tryGetProperty(String8("touch.size.scale"),
            out.sizeScale);
    out.haveSizeBias = in.tryGetProperty(String8("touch.size.bias"),
            out.sizeBias);
    out.haveSizeIsSummed = in.tryGetProperty(String8("touch.size.isSummed"),
            out.sizeIsSummed);

    // Pressure
    out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_DEFAULT;
    String8 pressureCalibrationString;
    if (in.tryGetProperty(String8("touch.pressure.calibration"), pressureCalibrationString)) {
        if (pressureCalibrationString == "none") {
            out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_NONE;
        } else if (pressureCalibrationString == "physical") {
            out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_PHYSICAL;
        } else if (pressureCalibrationString == "amplitude") {
            out.pressureCalibration = Calibration::PRESSURE_CALIBRATION_AMPLITUDE;
        } else if (pressureCalibrationString != "default") {
            LOGW("Invalid value for touch.pressure.calibration: '%s'",
                    pressureCalibrationString.string());
        }
    }

    out.havePressureScale = in.tryGetProperty(String8("touch.pressure.scale"),
            out.pressureScale);

    // Orientation
    out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_DEFAULT;
    String8 orientationCalibrationString;
    if (in.tryGetProperty(String8("touch.orientation.calibration"), orientationCalibrationString)) {
        if (orientationCalibrationString == "none") {
            out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_NONE;
        } else if (orientationCalibrationString == "interpolated") {
            out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_INTERPOLATED;
        } else if (orientationCalibrationString == "vector") {
            out.orientationCalibration = Calibration::ORIENTATION_CALIBRATION_VECTOR;
        } else if (orientationCalibrationString != "default") {
            LOGW("Invalid value for touch.orientation.calibration: '%s'",
                    orientationCalibrationString.string());
        }
    }

    // Distance
    out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_DEFAULT;
    String8 distanceCalibrationString;
    if (in.tryGetProperty(String8("touch.distance.calibration"), distanceCalibrationString)) {
        if (distanceCalibrationString == "none") {
            out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_NONE;
        } else if (distanceCalibrationString == "scaled") {
            out.distanceCalibration = Calibration::DISTANCE_CALIBRATION_SCALED;
        } else if (distanceCalibrationString != "default") {
            LOGW("Invalid value for touch.distance.calibration: '%s'",
                    distanceCalibrationString.string());
        }
    }

    out.haveDistanceScale = in.tryGetProperty(String8("touch.distance.scale"),
            out.distanceScale);
}

touch.size.calibration分为了1、geometric 2、diameter 3、area，老师说不懂的单词要查字典，现在都什么年代了，随便谷歌一下，手机也行。什么牛津字典啊的，那都是浮云了。geometric：几何图形？怪怪的，是不是代表不同的触摸的形状？不懂，diameter倒是还好，直径嘛应该是一个触摸的点是以这个为直径的一个圆，至于area嘛，区域，难道是多点的时候？也许吧。touch.pressure.calibration分为了1、physical 2、amplitude 。physical：物理的，是不是理论上的？amplitude是不是幅度就是压力的大小？不懂额。要不再来看看代码？那些配置之后肯定有执行的。不可能简简单单的就是赋值了。找找看
frameworks/base/services/input/InputReader.cpp

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void TouchInputMapper::cookPointerData() {
uint32_t currentPointerCount = mCurrentRawPointerData.pointerCount;
mCurrentCookedPointerData.clear();
mCurrentCookedPointerData.pointerCount = currentPointerCount;
mCurrentCookedPointerData.hoveringIdBits = mCurrentRawPointerData.hoveringIdBits;
mCurrentCookedPointerData.touchingIdBits = mCurrentRawPointerData.touchingIdBits;
// Walk through the the active pointers and map device coordinates onto
// surface coordinates and adjust for display orientation.
for (uint32_t i = 0; i < currentPointerCount; i++) {
const RawPointerData::Pointer& in = mCurrentRawPointerData.pointers[i];
// Size
float touchMajor, touchMinor, toolMajor, toolMinor, size;
switch (mCalibration.sizeCalibration) {
case Calibration::SIZE_CALIBRATION_GEOMETRIC:
case Calibration::SIZE_CALIBRATION_DIAMETER:
case Calibration::SIZE_CALIBRATION_AREA:
if (mRawPointerAxes.touchMajor.valid && mRawPointerAxes.toolMajor.valid) {
touchMajor = in.touchMajor;
touchMinor = mRawPointerAxes.touchMinor.valid ? in.touchMinor : in.touchMajor;
toolMajor = in.toolMajor;
toolMinor = mRawPointerAxes.toolMinor.valid ? in.toolMinor : in.toolMajor;
size = mRawPointerAxes.touchMinor.valid
? avg(in.touchMajor, in.touchMinor) : in.touchMajor;
} else if (mRawPointerAxes.touchMajor.valid) {
toolMajor = touchMajor = in.touchMajor;
toolMinor = touchMinor = mRawPointerAxes.touchMinor.valid
? in.touchMinor : in.touchMajor;
size = mRawPointerAxes.touchMinor.valid
? avg(in.touchMajor, in.touchMinor) : in.touchMajor;
} else if (mRawPointerAxes.toolMajor.valid) {
touchMajor = toolMajor = in.toolMajor;
touchMinor = toolMinor = mRawPointerAxes.toolMinor.valid
? in.toolMinor : in.toolMajor;
size = mRawPointerAxes.toolMinor.valid
? avg(in.toolMajor, in.toolMinor) : in.toolMajor;
} else {
LOG_ASSERT(false, "No touch or tool axes. "
"Size calibration should have been resolved to NONE.");
touchMajor = 0;
touchMinor = 0;
toolMajor = 0;
toolMinor = 0;
size = 0;
}
if (mCalibration.haveSizeIsSummed && mCalibration.sizeIsSummed) {
uint32_t touchingCount = mCurrentRawPointerData.touchingIdBits.count();
if (touchingCount > 1) {
touchMajor /= touchingCount;
touchMinor /= touchingCount;
toolMajor /= touchingCount;
toolMinor /= touchingCount;
size /= touchingCount;
}
}
if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_GEOMETRIC) {
touchMajor *= mGeometricScale;
touchMinor *= mGeometricScale;
toolMajor *= mGeometricScale;
toolMinor *= mGeometricScale;
} else if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_AREA) {
touchMajor = touchMajor > 0 ? sqrtf(touchMajor) : 0;
touchMinor = touchMajor;
toolMajor = toolMajor > 0 ? sqrtf(toolMajor) : 0;
toolMinor = toolMajor;
} else if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_DIAMETER) {
touchMinor = touchMajor;
toolMinor = toolMajor;
}
mCalibration.applySizeScaleAndBias(&touchMajor);
mCalibration.applySizeScaleAndBias(&touchMinor);
mCalibration.applySizeScaleAndBias(&toolMajor);
mCalibration.applySizeScaleAndBias(&toolMinor);
size *= mSizeScale;
break;
default:
touchMajor = 0;
touchMinor = 0;
toolMajor = 0;
toolMinor = 0;
size = 0;
break;
}
// Pressure
float pressure;
switch (mCalibration.pressureCalibration) {
case Calibration::PRESSURE_CALIBRATION_PHYSICAL:
case Calibration::PRESSURE_CALIBRATION_AMPLITUDE:
pressure = in.pressure * mPressureScale;
break;
default:
pressure = in.isHovering ? 0 : 1;
break;
}
// Tilt and Orientation
float tilt;
float orientation;
if (mHaveTilt) {
float tiltXAngle = (in.tiltX - mTiltXCenter) * mTiltXScale;
float tiltYAngle = (in.tiltY - mTiltYCenter) * mTiltYScale;
orientation = atan2f(-sinf(tiltXAngle), sinf(tiltYAngle));
tilt = acosf(cosf(tiltXAngle) * cosf(tiltYAngle));
} else {
tilt = 0;
switch (mCalibration.orientationCalibration) {
case Calibration::ORIENTATION_CALIBRATION_INTERPOLATED:
orientation = (in.orientation - mOrientationCenter) * mOrientationScale;
break;
case Calibration::ORIENTATION_CALIBRATION_VECTOR: {
int32_t c1 = signExtendNybble((in.orientation & 0xf0) >> 4);
int32_t c2 = signExtendNybble(in.orientation & 0x0f);
if (c1 != 0 || c2 != 0) {
orientation = atan2f(c1, c2) * 0.5f;
float confidence = hypotf(c1, c2);
float scale = 1.0f + confidence / 16.0f;
touchMajor *= scale;
touchMinor /= scale;
toolMajor *= scale;
toolMinor /= scale;
} else {
orientation = 0;
}
break;
}
default:
orientation = 0;
}
}
// Distance
float distance;
switch (mCalibration.distanceCalibration) {
case Calibration::DISTANCE_CALIBRATION_SCALED:
distance = in.distance * mDistanceScale;
break;
default:
distance = 0;
}
// X and Y
// Adjust coords for surface orientation.
float x, y;
switch (mSurfaceOrientation) {
case DISPLAY_ORIENTATION_90:
x = float(in.y - mRawPointerAxes.y.minValue) * mYScale;
y = float(mRawPointerAxes.x.maxValue - in.x) * mXScale;
orientation -= M_PI_2;
if (orientation < - M_PI_2) {
orientation += M_PI;
}
break;
case DISPLAY_ORIENTATION_180:
x = float(mRawPointerAxes.x.maxValue - in.x) * mXScale;
y = float(mRawPointerAxes.y.maxValue - in.y) * mYScale;
break;
case DISPLAY_ORIENTATION_270:
x = float(mRawPointerAxes.y.maxValue - in.y) * mYScale;
y = float(in.x - mRawPointerAxes.x.minValue) * mXScale;
orientation += M_PI_2;
if (orientation > M_PI_2) {
orientation -= M_PI;
}
break;
default:
x = float(in.x - mRawPointerAxes.x.minValue) * mXScale;
y = float(in.y - mRawPointerAxes.y.minValue) * mYScale;
break;
}
// Write output coords.
PointerCoords& out = mCurrentCookedPointerData.pointerCoords[i];
out.clear();
out.setAxisValue(AMOTION_EVENT_AXIS_X, x);
out.setAxisValue(AMOTION_EVENT_AXIS_Y, y);
out.setAxisValue(AMOTION_EVENT_AXIS_PRESSURE, pressure);
out.setAxisValue(AMOTION_EVENT_AXIS_SIZE, size);
out.setAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR, touchMajor);
out.setAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR, touchMinor);
out.setAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR, toolMajor);
out.setAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR, toolMinor);
out.setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, orientation);
out.setAxisValue(AMOTION_EVENT_AXIS_TILT, tilt);
out.setAxisValue(AMOTION_EVENT_AXIS_DISTANCE, distance);
// Write output properties.
PointerProperties& properties = mCurrentCookedPointerData.pointerProperties[i];
uint32_t id = in.id;
properties.clear();
properties.id = id;
properties.toolType = in.toolType;
// Write id index.
mCurrentCookedPointerData.idToIndex[id] = i;
}
}

void TouchInputMapper::cookPointerData() {
    uint32_t currentPointerCount = mCurrentRawPointerData.pointerCount;

    mCurrentCookedPointerData.clear();
    mCurrentCookedPointerData.pointerCount = currentPointerCount;
    mCurrentCookedPointerData.hoveringIdBits = mCurrentRawPointerData.hoveringIdBits;
    mCurrentCookedPointerData.touchingIdBits = mCurrentRawPointerData.touchingIdBits;

    // Walk through the the active pointers and map device coordinates onto
    // surface coordinates and adjust for display orientation.
    for (uint32_t i = 0; i < currentPointerCount; i++) {
        const RawPointerData::Pointer& in = mCurrentRawPointerData.pointers[i];

        // Size
        float touchMajor, touchMinor, toolMajor, toolMinor, size;
        switch (mCalibration.sizeCalibration) {
        case Calibration::SIZE_CALIBRATION_GEOMETRIC:
        case Calibration::SIZE_CALIBRATION_DIAMETER:
        case Calibration::SIZE_CALIBRATION_AREA:
            if (mRawPointerAxes.touchMajor.valid && mRawPointerAxes.toolMajor.valid) {
                touchMajor = in.touchMajor;
                touchMinor = mRawPointerAxes.touchMinor.valid ? in.touchMinor : in.touchMajor;
                toolMajor = in.toolMajor;
                toolMinor = mRawPointerAxes.toolMinor.valid ? in.toolMinor : in.toolMajor;
                size = mRawPointerAxes.touchMinor.valid
                        ? avg(in.touchMajor, in.touchMinor) : in.touchMajor;
            } else if (mRawPointerAxes.touchMajor.valid) {
                toolMajor = touchMajor = in.touchMajor;
                toolMinor = touchMinor = mRawPointerAxes.touchMinor.valid
                        ? in.touchMinor : in.touchMajor;
                size = mRawPointerAxes.touchMinor.valid
                        ? avg(in.touchMajor, in.touchMinor) : in.touchMajor;
            } else if (mRawPointerAxes.toolMajor.valid) {
                touchMajor = toolMajor = in.toolMajor;
                touchMinor = toolMinor = mRawPointerAxes.toolMinor.valid
                        ? in.toolMinor : in.toolMajor;
                size = mRawPointerAxes.toolMinor.valid
                        ? avg(in.toolMajor, in.toolMinor) : in.toolMajor;
            } else {
                LOG_ASSERT(false, "No touch or tool axes.  "
                        "Size calibration should have been resolved to NONE.");
                touchMajor = 0;
                touchMinor = 0;
                toolMajor = 0;
                toolMinor = 0;
                size = 0;
            }

            if (mCalibration.haveSizeIsSummed && mCalibration.sizeIsSummed) {
                uint32_t touchingCount = mCurrentRawPointerData.touchingIdBits.count();
                if (touchingCount > 1) {
                    touchMajor /= touchingCount;
                    touchMinor /= touchingCount;
                    toolMajor /= touchingCount;
                    toolMinor /= touchingCount;
                    size /= touchingCount;
                }
            }

            if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_GEOMETRIC) {
                touchMajor *= mGeometricScale;
                touchMinor *= mGeometricScale;
                toolMajor *= mGeometricScale;
                toolMinor *= mGeometricScale;
            } else if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_AREA) {
                touchMajor = touchMajor > 0 ? sqrtf(touchMajor) : 0;
                touchMinor = touchMajor;
                toolMajor = toolMajor > 0 ? sqrtf(toolMajor) : 0;
                toolMinor = toolMajor;
            } else if (mCalibration.sizeCalibration == Calibration::SIZE_CALIBRATION_DIAMETER) {
                touchMinor = touchMajor;
                toolMinor = toolMajor;
            }

            mCalibration.applySizeScaleAndBias(&touchMajor);
            mCalibration.applySizeScaleAndBias(&touchMinor);
            mCalibration.applySizeScaleAndBias(&toolMajor);
            mCalibration.applySizeScaleAndBias(&toolMinor);
            size *= mSizeScale;
            break;
        default:
            touchMajor = 0;
            touchMinor = 0;
            toolMajor = 0;
            toolMinor = 0;
            size = 0;
            break;
        }

        // Pressure
        float pressure;
        switch (mCalibration.pressureCalibration) {
        case Calibration::PRESSURE_CALIBRATION_PHYSICAL:
        case Calibration::PRESSURE_CALIBRATION_AMPLITUDE:
            pressure = in.pressure * mPressureScale;
            break;
        default:
            pressure = in.isHovering ? 0 : 1;
            break;
        }

        // Tilt and Orientation
        float tilt;
        float orientation;
        if (mHaveTilt) {
            float tiltXAngle = (in.tiltX - mTiltXCenter) * mTiltXScale;
            float tiltYAngle = (in.tiltY - mTiltYCenter) * mTiltYScale;
            orientation = atan2f(-sinf(tiltXAngle), sinf(tiltYAngle));
            tilt = acosf(cosf(tiltXAngle) * cosf(tiltYAngle));
        } else {
            tilt = 0;

            switch (mCalibration.orientationCalibration) {
            case Calibration::ORIENTATION_CALIBRATION_INTERPOLATED:
                orientation = (in.orientation - mOrientationCenter) * mOrientationScale;
                break;
            case Calibration::ORIENTATION_CALIBRATION_VECTOR: {
                int32_t c1 = signExtendNybble((in.orientation & 0xf0) >> 4);
                int32_t c2 = signExtendNybble(in.orientation & 0x0f);
                if (c1 != 0 || c2 != 0) {
                    orientation = atan2f(c1, c2) * 0.5f;
                    float confidence = hypotf(c1, c2);
                    float scale = 1.0f + confidence / 16.0f;
                    touchMajor *= scale;
                    touchMinor /= scale;
                    toolMajor *= scale;
                    toolMinor /= scale;
                } else {
                    orientation = 0;
                }
                break;
            }
            default:
                orientation = 0;
            }
        }

        // Distance
        float distance;
        switch (mCalibration.distanceCalibration) {
        case Calibration::DISTANCE_CALIBRATION_SCALED:
            distance = in.distance * mDistanceScale;
            break;
        default:
            distance = 0;
        }

        // X and Y
        // Adjust coords for surface orientation.
        float x, y;
        switch (mSurfaceOrientation) {
        case DISPLAY_ORIENTATION_90:
            x = float(in.y - mRawPointerAxes.y.minValue) * mYScale;
            y = float(mRawPointerAxes.x.maxValue - in.x) * mXScale;
            orientation -= M_PI_2;
            if (orientation < - M_PI_2) {
                orientation += M_PI;
            }
            break;
        case DISPLAY_ORIENTATION_180:
            x = float(mRawPointerAxes.x.maxValue - in.x) * mXScale;
            y = float(mRawPointerAxes.y.maxValue - in.y) * mYScale;
            break;
        case DISPLAY_ORIENTATION_270:
            x = float(mRawPointerAxes.y.maxValue - in.y) * mYScale;
            y = float(in.x - mRawPointerAxes.x.minValue) * mXScale;
            orientation += M_PI_2;
            if (orientation > M_PI_2) {
                orientation -= M_PI;
            }
            break;
        default:
            x = float(in.x - mRawPointerAxes.x.minValue) * mXScale;
            y = float(in.y - mRawPointerAxes.y.minValue) * mYScale;
            break;
        }

        // Write output coords.
        PointerCoords& out = mCurrentCookedPointerData.pointerCoords[i];
        out.clear();
        out.setAxisValue(AMOTION_EVENT_AXIS_X, x);
        out.setAxisValue(AMOTION_EVENT_AXIS_Y, y);
        out.setAxisValue(AMOTION_EVENT_AXIS_PRESSURE, pressure);
        out.setAxisValue(AMOTION_EVENT_AXIS_SIZE, size);
        out.setAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR, touchMajor);
        out.setAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR, touchMinor);
        out.setAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR, toolMajor);
        out.setAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR, toolMinor);
        out.setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION, orientation);
        out.setAxisValue(AMOTION_EVENT_AXIS_TILT, tilt);
        out.setAxisValue(AMOTION_EVENT_AXIS_DISTANCE, distance);

        // Write output properties.
        PointerProperties& properties = mCurrentCookedPointerData.pointerProperties[i];
        uint32_t id = in.id;
        properties.clear();
        properties.id = id;
        properties.toolType = in.toolType;

        // Write id index.
        mCurrentCookedPointerData.idToIndex[id] = i;
    }
}

这数据处理的，cookPointerData，哈哈哈，原来都在这里搞定的啊。TouchMajor and TouchMinor表示了触摸时接触面积的大小范围。这个函数会把驱动上传上来的数据，也就是X、Y坐标转换为android设定的分辨率的一个映射。差不多就这样了。具体，碰到问题了在解决了。
在此，有时候再讲讲自己调试的时候碰到的一个问题，那就是android电源管理中会把背光给关掉，所以点死了触摸屏还是发现没用。所以调试的时候可以把其中的一个

policyFlags设置下，不要drop掉，也就是即使背光关掉了也可以有效。
frameworks/base/services/input/InputDispatcher.cpp

[html] view plain copy print ?

void InputDispatcher::dispatchOnceInnerLocked(nsecs_t* nextWakeupTime) {
nsecs_t currentTime = now();
// Reset the key repeat timer whenever we disallow key events, even if the next event
// is not a key. This is to ensure that we abort a key repeat if the device is just coming
// out of sleep.
if (!mPolicy->isKeyRepeatEnabled()) {
resetKeyRepeatLocked();
}
// If dispatching is frozen, do not process timeouts or try to deliver any new events.
if (mDispatchFrozen) {
#if DEBUG_FOCUS
LOGD("Dispatch frozen. Waiting some more.");
#endif
return;
}
// Optimize latency of app switches.
// Essentially we start a short timeout when an app switch key (HOME / ENDCALL) has
// been pressed. When it expires, we preempt dispatch and drop all other pending events.
bool isAppSwitchDue = mAppSwitchDueTime <= currentTime;
if (mAppSwitchDueTime < *nextWakeupTime) {
*nextWakeupTime = mAppSwitchDueTime;
}
// Ready to start a new event.
// If we don't already have a pending event, go grab one.
if (! mPendingEvent) {
if (mInboundQueue.isEmpty()) {
if (isAppSwitchDue) {
// The inbound queue is empty so the app switch key we were waiting
// for will never arrive. Stop waiting for it.
resetPendingAppSwitchLocked(false);
isAppSwitchDue = false;
}
// Synthesize a key repeat if appropriate.
if (mKeyRepeatState.lastKeyEntry) {
if (currentTime >= mKeyRepeatState.nextRepeatTime) {
mPendingEvent = synthesizeKeyRepeatLocked(currentTime);
} else {
if (mKeyRepeatState.nextRepeatTime < *nextWakeupTime) {
*nextWakeupTime = mKeyRepeatState.nextRepeatTime;
}
}
}
// Nothing to do if there is no pending event.
if (! mPendingEvent) {
if (mActiveConnections.isEmpty()) {
dispatchIdleLocked();
}
return;
}
} else {
// Inbound queue has at least one entry.
EventEntry* entry = mInboundQueue.head;
// Throttle the entry if it is a move event and there are no
// other events behind it in the queue. Due to movement batching, additional
// samples may be appended to this event by the time the throttling timeout
// expires.
// TODO Make this smarter and consider throttling per device independently.
if (entry->type == EventEntry::TYPE_MOTION
&& !isAppSwitchDue
&& mDispatchEnabled
&& (entry->policyFlags & POLICY_FLAG_PASS_TO_USER)
&& !entry->isInjected()) {
MotionEntry* motionEntry = static_cast<MotionEntry*>(entry);
int32_t deviceId = motionEntry->deviceId;
uint32_t source = motionEntry->source;
if (! isAppSwitchDue
&& !motionEntry->next // exactly one event, no successors
&& (motionEntry->action == AMOTION_EVENT_ACTION_MOVE
|| motionEntry->action == AMOTION_EVENT_ACTION_HOVER_MOVE)
&& deviceId == mThrottleState.lastDeviceId
&& source == mThrottleState.lastSource) {
nsecs_t nextTime = mThrottleState.lastEventTime
+ mThrottleState.minTimeBetweenEvents;
if (currentTime < nextTime) {
// Throttle it!
#if DEBUG_THROTTLING
LOGD("Throttling - Delaying motion event for "
"device %d, source 0x%08x by up to %0.3fms.",
deviceId, source, (nextTime - currentTime) * 0.000001);
#endif
if (nextTime < *nextWakeupTime) {
*nextWakeupTime = nextTime;
}
if (mThrottleState.originalSampleCount == 0) {
mThrottleState.originalSampleCount =
motionEntry->countSamples();
}
return;
}
}
#if DEBUG_THROTTLING
if (mThrottleState.originalSampleCount != 0) {
uint32_t count = motionEntry->countSamples();
LOGD("Throttling - Motion event sample count grew by %d from %d to %d.",
count - mThrottleState.originalSampleCount,
mThrottleState.originalSampleCount, count);
mThrottleState.originalSampleCount = 0;
}
#endif
mThrottleState.lastEventTime = currentTime;
mThrottleState.lastDeviceId = deviceId;
mThrottleState.lastSource = source;
}
mInboundQueue.dequeue(entry);
mPendingEvent = entry;
}
// Poke user activity for this event.
if (mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER) {
pokeUserActivityLocked(mPendingEvent);
}
}
// Now we have an event to dispatch.
// All events are eventually dequeued and processed this way, even if we intend to drop them.
LOG_ASSERT(mPendingEvent != NULL);
bool done = false;
DropReason dropReason = DROP_REASON_NOT_DROPPED;
if (!(mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER)) {
dropReason = DROP_REASON_POLICY;
} else if (!mDispatchEnabled) {
dropReason = DROP_REASON_DISABLED;
}
if (mNextUnblockedEvent == mPendingEvent) {
mNextUnblockedEvent = NULL;
}
switch (mPendingEvent->type) {
case EventEntry::TYPE_CONFIGURATION_CHANGED: {
ConfigurationChangedEntry* typedEntry =
static_cast<ConfigurationChangedEntry*>(mPendingEvent);
done = dispatchConfigurationChangedLocked(currentTime, typedEntry);
dropReason = DROP_REASON_NOT_DROPPED; // configuration changes are never dropped
break;
}
case EventEntry::TYPE_DEVICE_RESET: {
DeviceResetEntry* typedEntry =
static_cast<DeviceResetEntry*>(mPendingEvent);
done = dispatchDeviceResetLocked(currentTime, typedEntry);
dropReason = DROP_REASON_NOT_DROPPED; // device resets are never dropped
break;
}
case EventEntry::TYPE_KEY: {
KeyEntry* typedEntry = static_cast<KeyEntry*>(mPendingEvent);
if (isAppSwitchDue) {
if (isAppSwitchKeyEventLocked(typedEntry)) {
resetPendingAppSwitchLocked(true);
isAppSwitchDue = false;
} else if (dropReason == DROP_REASON_NOT_DROPPED) {
dropReason = DROP_REASON_APP_SWITCH;
}
}
if (dropReason == DROP_REASON_NOT_DROPPED
&& isStaleEventLocked(currentTime, typedEntry)) {
dropReason = DROP_REASON_STALE;
}
if (dropReason == DROP_REASON_NOT_DROPPED && mNextUnblockedEvent) {
dropReason = DROP_REASON_BLOCKED;
}
done = dispatchKeyLocked(currentTime, typedEntry, &dropReason, nextWakeupTime);
break;
}
case EventEntry::TYPE_MOTION: {
MotionEntry* typedEntry = static_cast<MotionEntry*>(mPendingEvent);
if (dropReason == DROP_REASON_NOT_DROPPED && isAppSwitchDue) {
dropReason = DROP_REASON_APP_SWITCH;
}
if (dropReason == DROP_REASON_NOT_DROPPED
&& isStaleEventLocked(currentTime, typedEntry)) {
dropReason = DROP_REASON_STALE;
}
if (dropReason == DROP_REASON_NOT_DROPPED && mNextUnblockedEvent) {
dropReason = DROP_REASON_BLOCKED;
}
done = dispatchMotionLocked(currentTime, typedEntry,
&dropReason, nextWakeupTime);
break;
}
default:
LOG_ASSERT(false);
break;
}
if (done) {
if (dropReason != DROP_REASON_NOT_DROPPED) {
dropInboundEventLocked(mPendingEvent, dropReason);
}
releasePendingEventLocked();
*nextWakeupTime = LONG_LONG_MIN; // force next poll to wake up immediately
}
}

 void InputDispatcher::dispatchOnceInnerLocked(nsecs_t* nextWakeupTime) {
    nsecs_t currentTime = now();

    // Reset the key repeat timer whenever we disallow key events, even if the next event
    // is not a key.  This is to ensure that we abort a key repeat if the device is just coming
    // out of sleep.
    if (!mPolicy->isKeyRepeatEnabled()) {
        resetKeyRepeatLocked();
    }

    // If dispatching is frozen, do not process timeouts or try to deliver any new events.
    if (mDispatchFrozen) {
#if DEBUG_FOCUS
        LOGD("Dispatch frozen.  Waiting some more.");
#endif
        return;
    }

    // Optimize latency of app switches.
    // Essentially we start a short timeout when an app switch key (HOME / ENDCALL) has
    // been pressed.  When it expires, we preempt dispatch and drop all other pending events.
    bool isAppSwitchDue = mAppSwitchDueTime <= currentTime;
    if (mAppSwitchDueTime < *nextWakeupTime) {
        *nextWakeupTime = mAppSwitchDueTime;
    }

    // Ready to start a new event.
    // If we don't already have a pending event, go grab one.
    if (! mPendingEvent) {
        if (mInboundQueue.isEmpty()) {
            if (isAppSwitchDue) {
                // The inbound queue is empty so the app switch key we were waiting
                // for will never arrive.  Stop waiting for it.
                resetPendingAppSwitchLocked(false);
                isAppSwitchDue = false;
            }

            // Synthesize a key repeat if appropriate.
            if (mKeyRepeatState.lastKeyEntry) {
                if (currentTime >= mKeyRepeatState.nextRepeatTime) {
                    mPendingEvent = synthesizeKeyRepeatLocked(currentTime);
                } else {
                    if (mKeyRepeatState.nextRepeatTime < *nextWakeupTime) {
                        *nextWakeupTime = mKeyRepeatState.nextRepeatTime;
                    }
                }
            }

            // Nothing to do if there is no pending event.
            if (! mPendingEvent) {
                if (mActiveConnections.isEmpty()) {
                    dispatchIdleLocked();
                }
                return;
            }
        } else {
            // Inbound queue has at least one entry.
            EventEntry* entry = mInboundQueue.head;

            // Throttle the entry if it is a move event and there are no
            // other events behind it in the queue.  Due to movement batching, additional
            // samples may be appended to this event by the time the throttling timeout
            // expires.
            // TODO Make this smarter and consider throttling per device independently.
            if (entry->type == EventEntry::TYPE_MOTION
                    && !isAppSwitchDue
                    && mDispatchEnabled
                    && (entry->policyFlags & POLICY_FLAG_PASS_TO_USER)
                    && !entry->isInjected()) {
                MotionEntry* motionEntry = static_cast<MotionEntry*>(entry);
                int32_t deviceId = motionEntry->deviceId;
                uint32_t source = motionEntry->source;
                if (! isAppSwitchDue
                        && !motionEntry->next // exactly one event, no successors
                        && (motionEntry->action == AMOTION_EVENT_ACTION_MOVE
                                || motionEntry->action == AMOTION_EVENT_ACTION_HOVER_MOVE)
                        && deviceId == mThrottleState.lastDeviceId
                        && source == mThrottleState.lastSource) {
                    nsecs_t nextTime = mThrottleState.lastEventTime
                            + mThrottleState.minTimeBetweenEvents;
                    if (currentTime < nextTime) {
                        // Throttle it!
#if DEBUG_THROTTLING
                        LOGD("Throttling - Delaying motion event for "
                                "device %d, source 0x%08x by up to %0.3fms.",
                                deviceId, source, (nextTime - currentTime) * 0.000001);
#endif
                        if (nextTime < *nextWakeupTime) {
                            *nextWakeupTime = nextTime;
                        }
                        if (mThrottleState.originalSampleCount == 0) {
                            mThrottleState.originalSampleCount =
                                    motionEntry->countSamples();
                        }
                        return;
                    }
                }

#if DEBUG_THROTTLING
                if (mThrottleState.originalSampleCount != 0) {
                    uint32_t count = motionEntry->countSamples();
                    LOGD("Throttling - Motion event sample count grew by %d from %d to %d.",
                            count - mThrottleState.originalSampleCount,
                            mThrottleState.originalSampleCount, count);
                    mThrottleState.originalSampleCount = 0;
                }
#endif

                mThrottleState.lastEventTime = currentTime;
                mThrottleState.lastDeviceId = deviceId;
                mThrottleState.lastSource = source;
            }

            mInboundQueue.dequeue(entry);
            mPendingEvent = entry;
        }

        // Poke user activity for this event.
        if (mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER) {
            pokeUserActivityLocked(mPendingEvent);
        }
    }

    // Now we have an event to dispatch.
    // All events are eventually dequeued and processed this way, even if we intend to drop them.
    LOG_ASSERT(mPendingEvent != NULL);
    bool done = false;
    DropReason dropReason = DROP_REASON_NOT_DROPPED;
    if (!(mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER)) {
        dropReason = DROP_REASON_POLICY;
    } else if (!mDispatchEnabled) {
        dropReason = DROP_REASON_DISABLED;
    }

    if (mNextUnblockedEvent == mPendingEvent) {
        mNextUnblockedEvent = NULL;
    }

    switch (mPendingEvent->type) {
    case EventEntry::TYPE_CONFIGURATION_CHANGED: {
        ConfigurationChangedEntry* typedEntry =
                static_cast<ConfigurationChangedEntry*>(mPendingEvent);
        done = dispatchConfigurationChangedLocked(currentTime, typedEntry);
        dropReason = DROP_REASON_NOT_DROPPED; // configuration changes are never dropped
        break;
    }

    case EventEntry::TYPE_DEVICE_RESET: {
        DeviceResetEntry* typedEntry =
                static_cast<DeviceResetEntry*>(mPendingEvent);
        done = dispatchDeviceResetLocked(currentTime, typedEntry);
        dropReason = DROP_REASON_NOT_DROPPED; // device resets are never dropped
        break;
    }

    case EventEntry::TYPE_KEY: {
        KeyEntry* typedEntry = static_cast<KeyEntry*>(mPendingEvent);
        if (isAppSwitchDue) {
            if (isAppSwitchKeyEventLocked(typedEntry)) {
                resetPendingAppSwitchLocked(true);
                isAppSwitchDue = false;
            } else if (dropReason == DROP_REASON_NOT_DROPPED) {
                dropReason = DROP_REASON_APP_SWITCH;
            }
        }
        if (dropReason == DROP_REASON_NOT_DROPPED
                && isStaleEventLocked(currentTime, typedEntry)) {
            dropReason = DROP_REASON_STALE;
        }
        if (dropReason == DROP_REASON_NOT_DROPPED && mNextUnblockedEvent) {
            dropReason = DROP_REASON_BLOCKED;
        }
        done = dispatchKeyLocked(currentTime, typedEntry, &dropReason, nextWakeupTime);
        break;
    }

    case EventEntry::TYPE_MOTION: {
        MotionEntry* typedEntry = static_cast<MotionEntry*>(mPendingEvent);
        if (dropReason == DROP_REASON_NOT_DROPPED && isAppSwitchDue) {
            dropReason = DROP_REASON_APP_SWITCH;
        }
        if (dropReason == DROP_REASON_NOT_DROPPED
                && isStaleEventLocked(currentTime, typedEntry)) {
            dropReason = DROP_REASON_STALE;
        }
        if (dropReason == DROP_REASON_NOT_DROPPED && mNextUnblockedEvent) {
            dropReason = DROP_REASON_BLOCKED;
        }
        done = dispatchMotionLocked(currentTime, typedEntry,
                &dropReason, nextWakeupTime);
        break;
    }

    default:
        LOG_ASSERT(false);
        break;
    }

    if (done) {
        if (dropReason != DROP_REASON_NOT_DROPPED) {
            dropInboundEventLocked(mPendingEvent, dropReason);
        }

        releasePendingEventLocked();
        *nextWakeupTime = LONG_LONG_MIN;  // force next poll to wake up immediately
    }
}

只要把下面的东西给注释掉就好了，那具体的policyflags是哪里赋值的呢？真心找了我好久的。
frameworks/base/services/input/InputDispatcher.cpp

[html] view plain copy print ?

if (!(mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER)) {
dropReason = DROP_REASON_POLICY;
} else if (!mDispatchEnabled) {
dropReason = DROP_REASON_DISABLED;
}

  if (!(mPendingEvent->policyFlags & POLICY_FLAG_PASS_TO_USER)) {
        dropReason = DROP_REASON_POLICY;
    } else if (!mDispatchEnabled) {
        dropReason = DROP_REASON_DISABLED;
    }

frameworks/base/services/input/InputDispatcher.cpp

[html] view plain copy print ?

void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
#if DEBUG_INBOUND_EVENT_DETAILS
LOGD("notifyMotion - eventTime=%lld, deviceId=%d, source=0x%x, policyFlags=0x%x, "
"action=0x%x, flags=0x%x, metaState=0x%x, buttonState=0x%x, edgeFlags=0x%x, "
"xPrecision=%f, yPrecision=%f, downTime=%lld",
args->eventTime, args->deviceId, args->source, args->policyFlags,
args->action, args->flags, args->metaState, args->buttonState,
args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime);
for (uint32_t i = 0; i < args->pointerCount; i++) {
LOGD(" Pointer %d: id=%d, toolType=%d, "
"x=%f, y=%f, pressure=%f, size=%f, "
"touchMajor=%f, touchMinor=%f, toolMajor=%f, toolMinor=%f, "
"orientation=%f",
i, args->pointerProperties[i].id,
args->pointerProperties[i].toolType,
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_X),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_Y),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_PRESSURE),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_SIZE),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR),
args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_ORIENTATION));
}
#endif
if (!validateMotionEvent(args->action, args->pointerCount, args->pointerProperties)) {
return;
}
uint32_t policyFlags = args->policyFlags;
policyFlags |= POLICY_FLAG_TRUSTED;
mPolicy->interceptMotionBeforeQueueing(args->eventTime, /*byref*/ policyFlags);
bool needWake;
{ // acquire lock
mLock.lock();
if (mInputFilterEnabled) {
mLock.unlock();
MotionEvent event;
event.initialize(args->deviceId, args->source, args->action, args->flags,
args->edgeFlags, args->metaState, args->buttonState, 0, 0,
args->xPrecision, args->yPrecision,
args->downTime, args->eventTime,
args->pointerCount, args->pointerProperties, args->pointerCoords);
policyFlags |= POLICY_FLAG_FILTERED;
if (!mPolicy->filterInputEvent(&event, policyFlags)) {
return; // event was consumed by the filter
}
mLock.lock();
}
// Attempt batching and streaming of move events.
if (args->action == AMOTION_EVENT_ACTION_MOVE
|| args->action == AMOTION_EVENT_ACTION_HOVER_MOVE) {
// BATCHING CASE
//
// Try to append a move sample to the tail of the inbound queue for this device.
// Give up if we encounter a non-move motion event for this device since that
// means we cannot append any new samples until a new motion event has started.
for (EventEntry* entry = mInboundQueue.tail; entry; entry = entry->prev) {
if (entry->type != EventEntry::TYPE_MOTION) {
// Keep looking for motion events.
continue;
}
MotionEntry* motionEntry = static_cast<MotionEntry*>(entry);
if (motionEntry->deviceId != args->deviceId
|| motionEntry->source != args->source) {
// Keep looking for this device and source.
continue;
}
if (!motionEntry->canAppendSamples(args->action,
args->pointerCount, args->pointerProperties)) {
// Last motion event in the queue for this device and source is
// not compatible for appending new samples. Stop here.
goto NoBatchingOrStreaming;
}
// Do the batching magic.
batchMotionLocked(motionEntry, args->eventTime,
args->metaState, args->pointerCoords,
"most recent motion event for this device and source in the inbound queue");
mLock.unlock();
return; // done!
}
// BATCHING ONTO PENDING EVENT CASE
//
// Try to append a move sample to the currently pending event, if there is one.
// We can do this as long as we are still waiting to find the targets for the
// event. Once the targets are locked-in we can only do streaming.
if (mPendingEvent
&& (!mPendingEvent->dispatchInProgress || !mCurrentInputTargetsValid)
&& mPendingEvent->type == EventEntry::TYPE_MOTION) {
MotionEntry* motionEntry = static_cast<MotionEntry*>(mPendingEvent);
if (motionEntry->deviceId == args->deviceId
&& motionEntry->source == args->source) {
if (!motionEntry->canAppendSamples(args->action,
args->pointerCount, args->pointerProperties)) {
// Pending motion event is for this device and source but it is
// not compatible for appending new samples. Stop here.
goto NoBatchingOrStreaming;
}
// Do the batching magic.
batchMotionLocked(motionEntry, args->eventTime,
args->metaState, args->pointerCoords,
"pending motion event");
mLock.unlock();
return; // done!
}
}
// STREAMING CASE
//
// There is no pending motion event (of any kind) for this device in the inbound queue.
// Search the outbound queue for the current foreground targets to find a dispatched
// motion event that is still in progress. If found, then, appen the new sample to
// that event and push it out to all current targets. The logic in
// prepareDispatchCycleLocked takes care of the case where some targets may
// already have consumed the motion event by starting a new dispatch cycle if needed.
if (mCurrentInputTargetsValid) {
for (size_t i = 0; i < mCurrentInputTargets.size(); i++) {
const InputTarget& inputTarget = mCurrentInputTargets[i];
if ((inputTarget.flags & InputTarget::FLAG_FOREGROUND) == 0) {
// Skip non-foreground targets. We only want to stream if there is at
// least one foreground target whose dispatch is still in progress.
continue;
}
ssize_t connectionIndex = getConnectionIndexLocked(inputTarget.inputChannel);
if (connectionIndex < 0) {
// Connection must no longer be valid.
continue;
}
sp<Connection> connection = mConnectionsByReceiveFd.valueAt(connectionIndex);
if (connection->outboundQueue.isEmpty()) {
// This foreground target has an empty outbound queue.
continue;
}
DispatchEntry* dispatchEntry = connection->outboundQueue.head;
if (! dispatchEntry->inProgress
|| dispatchEntry->eventEntry->type != EventEntry::TYPE_MOTION
|| dispatchEntry->isSplit()) {
// No motion event is being dispatched, or it is being split across
// windows in which case we cannot stream.
continue;
}
MotionEntry* motionEntry = static_cast<MotionEntry*>(
dispatchEntry->eventEntry);
if (motionEntry->action != args->action
|| motionEntry->deviceId != args->deviceId
|| motionEntry->source != args->source
|| motionEntry->pointerCount != args->pointerCount
|| motionEntry->isInjected()) {
// The motion event is not compatible with this move.
continue;
}
if (args->action == AMOTION_EVENT_ACTION_HOVER_MOVE) {
if (mLastHoverWindowHandle == NULL) {
#if DEBUG_BATCHING
LOGD("Not streaming hover move because there is no "
"last hovered window.");
#endif
goto NoBatchingOrStreaming;
}
sp<InputWindowHandle> hoverWindowHandle = findTouchedWindowAtLocked(
args->pointerCoords[0].getAxisValue(AMOTION_EVENT_AXIS_X),
args->pointerCoords[0].getAxisValue(AMOTION_EVENT_AXIS_Y));
if (mLastHoverWindowHandle != hoverWindowHandle) {
#if DEBUG_BATCHING
LOGD("Not streaming hover move because the last hovered window "
"is '%s' but the currently hovered window is '%s'.",
mLastHoverWindowHandle->getName().string(),
hoverWindowHandle != NULL
? hoverWindowHandle->getName().string() : "<null>");
#endif
goto NoBatchingOrStreaming;
}
}
// Hurray! This foreground target is currently dispatching a move event
// that we can stream onto. Append the motion sample and resume dispatch.
motionEntry->appendSample(args->eventTime, args->pointerCoords);
#if DEBUG_BATCHING
LOGD("Appended motion sample onto batch for most recently dispatched "
"motion event for this device and source in the outbound queues. "
"Attempting to stream the motion sample.");
#endif
nsecs_t currentTime = now();
dispatchEventToCurrentInputTargetsLocked(currentTime, motionEntry,
true /*resumeWithAppendedMotionSample*/);
runCommandsLockedInterruptible();
mLock.unlock();
return; // done!
}
}
NoBatchingOrStreaming:;
}
// Just enqueue a new motion event.
MotionEntry* newEntry = new MotionEntry(args->eventTime,
args->deviceId, args->source, policyFlags,
args->action, args->flags, args->metaState, args->buttonState,
args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime,
args->pointerCount, args->pointerProperties, args->pointerCoords);
needWake = enqueueInboundEventLocked(newEntry);
mLock.unlock();
} // release lock
if (needWake) {
mLooper->wake();
}
}

void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
#if DEBUG_INBOUND_EVENT_DETAILS
    LOGD("notifyMotion - eventTime=%lld, deviceId=%d, source=0x%x, policyFlags=0x%x, "
            "action=0x%x, flags=0x%x, metaState=0x%x, buttonState=0x%x, edgeFlags=0x%x, "
            "xPrecision=%f, yPrecision=%f, downTime=%lld",
            args->eventTime, args->deviceId, args->source, args->policyFlags,
            args->action, args->flags, args->metaState, args->buttonState,
            args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime);
    for (uint32_t i = 0; i < args->pointerCount; i++) {
        LOGD("  Pointer %d: id=%d, toolType=%d, "
                "x=%f, y=%f, pressure=%f, size=%f, "
                "touchMajor=%f, touchMinor=%f, toolMajor=%f, toolMinor=%f, "
                "orientation=%f",
                i, args->pointerProperties[i].id,
                args->pointerProperties[i].toolType,
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_X),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_Y),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_PRESSURE),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_SIZE),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOOL_MAJOR),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOOL_MINOR),
                args->pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_ORIENTATION));
    }
#endif
    if (!validateMotionEvent(args->action, args->pointerCount, args->pointerProperties)) {
        return;
    }

    uint32_t policyFlags = args->policyFlags;
    policyFlags |= POLICY_FLAG_TRUSTED;
    mPolicy->interceptMotionBeforeQueueing(args->eventTime, /*byref*/ policyFlags);

    bool needWake;
    { // acquire lock
        mLock.lock();

        if (mInputFilterEnabled) {
            mLock.unlock();

            MotionEvent event;
            event.initialize(args->deviceId, args->source, args->action, args->flags,
                    args->edgeFlags, args->metaState, args->buttonState, 0, 0,
                    args->xPrecision, args->yPrecision,
                    args->downTime, args->eventTime,
                    args->pointerCount, args->pointerProperties, args->pointerCoords);

            policyFlags |= POLICY_FLAG_FILTERED;
            if (!mPolicy->filterInputEvent(&event, policyFlags)) {
                return; // event was consumed by the filter
            }

            mLock.lock();
        }

        // Attempt batching and streaming of move events.
        if (args->action == AMOTION_EVENT_ACTION_MOVE
                || args->action == AMOTION_EVENT_ACTION_HOVER_MOVE) {
            // BATCHING CASE
            //
            // Try to append a move sample to the tail of the inbound queue for this device.
            // Give up if we encounter a non-move motion event for this device since that
            // means we cannot append any new samples until a new motion event has started.
            for (EventEntry* entry = mInboundQueue.tail; entry; entry = entry->prev) {
                if (entry->type != EventEntry::TYPE_MOTION) {
                    // Keep looking for motion events.
                    continue;
                }

                MotionEntry* motionEntry = static_cast<MotionEntry*>(entry);
                if (motionEntry->deviceId != args->deviceId
                        || motionEntry->source != args->source) {
                    // Keep looking for this device and source.
                    continue;
                }

                if (!motionEntry->canAppendSamples(args->action,
                        args->pointerCount, args->pointerProperties)) {
                    // Last motion event in the queue for this device and source is
                    // not compatible for appending new samples.  Stop here.
                    goto NoBatchingOrStreaming;
                }

                // Do the batching magic.
                batchMotionLocked(motionEntry, args->eventTime,
                        args->metaState, args->pointerCoords,
                        "most recent motion event for this device and source in the inbound queue");
                mLock.unlock();
                return; // done!
            }

            // BATCHING ONTO PENDING EVENT CASE
            //
            // Try to append a move sample to the currently pending event, if there is one.
            // We can do this as long as we are still waiting to find the targets for the
            // event.  Once the targets are locked-in we can only do streaming.
            if (mPendingEvent
                    && (!mPendingEvent->dispatchInProgress || !mCurrentInputTargetsValid)
                    && mPendingEvent->type == EventEntry::TYPE_MOTION) {
                MotionEntry* motionEntry = static_cast<MotionEntry*>(mPendingEvent);
                if (motionEntry->deviceId == args->deviceId
                        && motionEntry->source == args->source) {
                    if (!motionEntry->canAppendSamples(args->action,
                            args->pointerCount, args->pointerProperties)) {
                        // Pending motion event is for this device and source but it is
                        // not compatible for appending new samples.  Stop here.
                        goto NoBatchingOrStreaming;
                    }

                    // Do the batching magic.
                    batchMotionLocked(motionEntry, args->eventTime,
                            args->metaState, args->pointerCoords,
                            "pending motion event");
                    mLock.unlock();
                    return; // done!
                }
            }

            // STREAMING CASE
            //
            // There is no pending motion event (of any kind) for this device in the inbound queue.
            // Search the outbound queue for the current foreground targets to find a dispatched
            // motion event that is still in progress.  If found, then, appen the new sample to
            // that event and push it out to all current targets.  The logic in
            // prepareDispatchCycleLocked takes care of the case where some targets may
            // already have consumed the motion event by starting a new dispatch cycle if needed.
            if (mCurrentInputTargetsValid) {
                for (size_t i = 0; i < mCurrentInputTargets.size(); i++) {
                    const InputTarget& inputTarget = mCurrentInputTargets[i];
                    if ((inputTarget.flags & InputTarget::FLAG_FOREGROUND) == 0) {
                        // Skip non-foreground targets.  We only want to stream if there is at
                        // least one foreground target whose dispatch is still in progress.
                        continue;
                    }

                    ssize_t connectionIndex = getConnectionIndexLocked(inputTarget.inputChannel);
                    if (connectionIndex < 0) {
                        // Connection must no longer be valid.
                        continue;
                    }

                    sp<Connection> connection = mConnectionsByReceiveFd.valueAt(connectionIndex);
                    if (connection->outboundQueue.isEmpty()) {
                        // This foreground target has an empty outbound queue.
                        continue;
                    }

                    DispatchEntry* dispatchEntry = connection->outboundQueue.head;
                    if (! dispatchEntry->inProgress
                            || dispatchEntry->eventEntry->type != EventEntry::TYPE_MOTION
                            || dispatchEntry->isSplit()) {
                        // No motion event is being dispatched, or it is being split across
                        // windows in which case we cannot stream.
                        continue;
                    }

                    MotionEntry* motionEntry = static_cast<MotionEntry*>(
                            dispatchEntry->eventEntry);
                    if (motionEntry->action != args->action
                            || motionEntry->deviceId != args->deviceId
                            || motionEntry->source != args->source
                            || motionEntry->pointerCount != args->pointerCount
                            || motionEntry->isInjected()) {
                        // The motion event is not compatible with this move.
                        continue;
                    }

                    if (args->action == AMOTION_EVENT_ACTION_HOVER_MOVE) {
                        if (mLastHoverWindowHandle == NULL) {
#if DEBUG_BATCHING
                            LOGD("Not streaming hover move because there is no "
                                    "last hovered window.");
#endif
                            goto NoBatchingOrStreaming;
                        }

                        sp<InputWindowHandle> hoverWindowHandle = findTouchedWindowAtLocked(
                                args->pointerCoords[0].getAxisValue(AMOTION_EVENT_AXIS_X),
                                args->pointerCoords[0].getAxisValue(AMOTION_EVENT_AXIS_Y));
                        if (mLastHoverWindowHandle != hoverWindowHandle) {
#if DEBUG_BATCHING
                            LOGD("Not streaming hover move because the last hovered window "
                                    "is '%s' but the currently hovered window is '%s'.",
                                    mLastHoverWindowHandle->getName().string(),
                                    hoverWindowHandle != NULL
                                            ? hoverWindowHandle->getName().string() : "<null>");
#endif
                            goto NoBatchingOrStreaming;
                        }
                    }

                    // Hurray!  This foreground target is currently dispatching a move event
                    // that we can stream onto.  Append the motion sample and resume dispatch.
                    motionEntry->appendSample(args->eventTime, args->pointerCoords);
#if DEBUG_BATCHING
                    LOGD("Appended motion sample onto batch for most recently dispatched "
                            "motion event for this device and source in the outbound queues.  "
                            "Attempting to stream the motion sample.");
#endif
                    nsecs_t currentTime = now();
                    dispatchEventToCurrentInputTargetsLocked(currentTime, motionEntry,
                            true /*resumeWithAppendedMotionSample*/);

                    runCommandsLockedInterruptible();
                    mLock.unlock();
                    return; // done!
                }
            }

NoBatchingOrStreaming:;
        }

        // Just enqueue a new motion event.
        MotionEntry* newEntry = new MotionEntry(args->eventTime,
                args->deviceId, args->source, policyFlags,
                args->action, args->flags, args->metaState, args->buttonState,
                args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime,
                args->pointerCount, args->pointerProperties, args->pointerCoords);

        needWake = enqueueInboundEventLocked(newEntry);
        mLock.unlock();
    } // release lock

    if (needWake) {
        mLooper->wake();
    }
}

看到了吗？就是这里了，interceptMotionBeforeQueueing()函数，

[html] view plain copy print ?

uint32_t policyFlags = args->policyFlags;
policyFlags |= POLICY_FLAG_TRUSTED;
mPolicy->interceptMotionBeforeQueueing(args->eventTime, /*byref*/ policyFlags);

 uint32_t policyFlags = args->policyFlags;
    policyFlags |= POLICY_FLAG_TRUSTED;
    mPolicy->interceptMotionBeforeQueueing(args->eventTime, /*byref*/ policyFlags);

[html] view plain copy print ?

void NativeInputManager::interceptMotionBeforeQueueing(nsecs_t when, uint32_t& policyFlags) {
// Policy:
// - Ignore untrusted events and pass them along.
// - No special filtering for injected events required at this time.
// - Filter normal events based on screen state.
// - For normal events brighten (but do not wake) the screen if currently dim.
if ((policyFlags & POLICY_FLAG_TRUSTED) && !(policyFlags & POLICY_FLAG_INJECTED)) {
if (isScreenOn()) {
policyFlags |= POLICY_FLAG_PASS_TO_USER;
if (!isScreenBright()) {
policyFlags |= POLICY_FLAG_BRIGHT_HERE;
}
} else {
JNIEnv* env = jniEnv();
jint wmActions = env->CallIntMethod(mCallbacksObj,
gCallbacksClassInfo.interceptMotionBeforeQueueingWhenScreenOff,
policyFlags);
if (checkAndClearExceptionFromCallback(env,
"interceptMotionBeforeQueueingWhenScreenOff")) {
wmActions = 0;
}
policyFlags |= POLICY_FLAG_WOKE_HERE | POLICY_FLAG_BRIGHT_HERE;
handleInterceptActions(wmActions, when, /*byref*/ policyFlags);
}
} else {
policyFlags |= POLICY_FLAG_PASS_TO_USER;
}
}

posted @ 2013-07-18 14:15 莫回头阅读(1312) 评论(0) 收藏举报

莫回头

和菜鸟一起学android4.0.3源码之touchscreen配置+调试记录 .

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