IMS:MotionEvent 坐标点（上）

android12-security-release
主要查看获取hal底层原始坐标，并通过InputChannel发送流程，其中只关注坐标点

Android屏幕x、y轴

屏幕的左上角作为坐标原点，X轴向右为正，Y轴向下为正。

开发者选项中指针位置、ViewRootImpl坐标

打开IMS:开发者选项中指针位置开关，比较直观查看：

X:640.9 Y:1250.9这个就是坐标点（640.9，1250.9），这里(ps.mCoords.x,ps.mCoords.y)通过PointerEventDispatcher/InputChannel传递上来的MotionEvent

ViewRootImpl是通过WindowInputEventReceiver\InputChannel传递上来的MotionEvent，实质都是InputEventReceiver\InputChannel

InputEventReceiver传递MotionEvent

IMS:InputChannel通过socket发送Input给App

frameworks/base/core/java/android/view/InputEventReceiver.java

frameworks/base/core/jni/android_view_InputEventReceiver.cpp

绕不开的JNI

frameworks/base/core/java/android/view/MotionEvent.java
frameworks/base/core/jni/android_view_MotionEvent.cpp
frameworks/native/include/input/Input.h
对象PointerCoords中：

InputDispatcher分发时坐标点

IMS:InputDispatcher线程分发事件
frameworks/native/libs/input/InputTransport.cpp
frameworks/native/services/inputflinger/dispatcher/InputDispatcher.cpp

（motionEntry.xCursorPosition,motionEntry.yCursorPosition）
InputDispatcher.cpp中对象传递：（建议倒着查看流程）

–mInboundQueue.push_back(std::move(newEntry));【enqueueInboundEventLocked(std::move(newEntry));】
–mPendingEvent = mInboundQueue.front();
–std::shared_ptr<MotionEntry> motionEntry = std::static_pointer_cast<MotionEntry>(mPendingEvent);
–connection->outboundQueue.push_back(dispatchEntry.release());【enqueueDispatchEntryLocked(…)】
–DispatchEntry* dispatchEntry = connection->outboundQueue.front();
–EventEntry& eventEntry = *(dispatchEntry->eventEntry);
–MotionEntry& motionEntry = static_cast<const MotionEntry&>(eventEntry);

InputReader获取处理MotionEvent

IMS:InputReader线程获取输入事件

frameworks/native/services/inputflinger/InputListener.cpp
frameworks/native/services/inputflinger/reader/InputReader.cpp
frameworks/native/services/inputflinger/reader/InputDevice.cpp
–size_t count = mEventHub->getEvents(timeoutMillis, mEventBuffer, EVENT_BUFFER_SIZE);
–processEventsLocked(mEventBuffer, count);
–processEventsForDeviceLocked(deviceId, rawEvent, batchSize);
–device->process(rawEvents, count);
–mapper.process(rawEvent);

// --- NotifyMotionArgs ---NotifyMotionArgs::NotifyMotionArgs(int32_t id, nsecs_t eventTime, nsecs_t readTime, int32_t deviceId, uint32_t source,int32_t displayId, uint32_t policyFlags, int32_t action, int32_t actionButton,int32_t flags, int32_t metaState, int32_t buttonState, MotionClassification classification,int32_t edgeFlags, uint32_t pointerCount, const PointerProperties* pointerProperties,const PointerCoords* pointerCoords, float xPrecision, float yPrecision,float xCursorPosition, float yCursorPosition, nsecs_t downTime,const std::vector<TouchVideoFrame>& videoFrames): NotifyArgs(id, eventTime),deviceId(deviceId),source(source),displayId(displayId),policyFlags(policyFlags),action(action),actionButton(actionButton),flags(flags),metaState(metaState),buttonState(buttonState),classification(classification),edgeFlags(edgeFlags),pointerCount(pointerCount),xPrecision(xPrecision),yPrecision(yPrecision),xCursorPosition(xCursorPosition),yCursorPosition(yCursorPosition),downTime(downTime),readTime(readTime),videoFrames(videoFrames) {for (uint32_t i = 0; i < pointerCount; i++) {this->pointerProperties[i].copyFrom(pointerProperties[i]);this->pointerCoords[i].copyFrom(pointerCoords[i]);}
}
//... ...
void NotifyMotionArgs::notify(const sp<InputListenerInterface>& listener) const {listener->notifyMotion(this);
}

SingleTouchInputMapper\MultiTouchInputMapper处理

EventHub连接硬件设备\外部设备时，匹配添加相应InputMapper
......TouchInputMapper::process处理–processRawTouches–cookAndDispatch–dispatch...–dispatchMotion
NotifyMotionArgs 初始化参数xPrecision, yPrecision–mOrientedXPrecision, mOrientedYPrecision

void TouchInputMapper::dispatchMotion(nsecs_t when, nsecs_t readTime, uint32_t policyFlags,uint32_t source, int32_t action, int32_t actionButton,int32_t flags, int32_t metaState, int32_t buttonState,int32_t edgeFlags, const PointerProperties* properties,const PointerCoords* coords, const uint32_t* idToIndex,BitSet32 idBits, int32_t changedId, float xPrecision,float yPrecision, nsecs_t downTime) {// ... ...NotifyMotionArgs args(getContext()->getNextId(), when, readTime, deviceId, source, displayId,policyFlags, action, actionButton, flags, metaState, buttonState,MotionClassification::NONE, edgeFlags, pointerCount, pointerProperties,pointerCoords, xPrecision, yPrecision, xCursorPosition, yCursorPosition,downTime, std::move(frames));getListener()->notifyMotion(&args);
}

RawPointerAxes

EventHub获取屏幕硬件上报

IMS:EventHub设备底层上报Input事件对象处理