/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef _UI_INPUT_READER_H #define _UI_INPUT_READER_H #include #include #include #include #include #include #include #include #include #include #include namespace android { class InputDevice; class InputMapper; /* * Input reader policy interface. * * The input reader policy is used by the input reader to interact with the Window Manager * and other system components. * * The actual implementation is partially supported by callbacks into the DVM * via JNI. This interface is also mocked in the unit tests. */ class InputReaderPolicyInterface : public virtual RefBase { protected: InputReaderPolicyInterface() { } virtual ~InputReaderPolicyInterface() { } public: /* Display orientations. */ enum { ROTATION_0 = 0, ROTATION_90 = 1, ROTATION_180 = 2, ROTATION_270 = 3 }; /* Actions returned by interceptXXX methods. */ enum { // The input dispatcher should do nothing and discard the input unless other // flags are set. ACTION_NONE = 0, // The input dispatcher should dispatch the input to the application. ACTION_DISPATCH = 0x00000001, // The input dispatcher should perform special filtering in preparation for // a pending app switch. ACTION_APP_SWITCH_COMING = 0x00000002, }; /* Describes a virtual key. */ struct VirtualKeyDefinition { int32_t scanCode; // configured position data, specified in display coords int32_t centerX; int32_t centerY; int32_t width; int32_t height; }; /* Gets information about the display with the specified id. * Returns true if the display info is available, false otherwise. */ virtual bool getDisplayInfo(int32_t displayId, int32_t* width, int32_t* height, int32_t* orientation) = 0; /* Provides feedback for a virtual key down. */ virtual void virtualKeyDownFeedback() = 0; /* Intercepts a key event. * The policy can use this method as an opportunity to perform power management functions * and early event preprocessing such as updating policy flags. * * Returns a policy action constant such as ACTION_DISPATCH. */ virtual int32_t interceptKey(nsecs_t when, int32_t deviceId, bool down, int32_t keyCode, int32_t scanCode, uint32_t& policyFlags) = 0; /* Intercepts a switch event. * The policy can use this method as an opportunity to perform power management functions * and early event preprocessing such as updating policy flags. * * Switches are not dispatched to applications so this method should * usually return ACTION_NONE. */ virtual int32_t interceptSwitch(nsecs_t when, int32_t switchCode, int32_t switchValue, uint32_t& policyFlags) = 0; /* Intercepts a generic touch, trackball or other event. * The policy can use this method as an opportunity to perform power management functions * and early event preprocessing such as updating policy flags. * * Returns a policy action constant such as ACTION_DISPATCH. */ virtual int32_t interceptGeneric(nsecs_t when, uint32_t& policyFlags) = 0; /* Determines whether to turn on some hacks we have to improve the touch interaction with a * certain device whose screen currently is not all that good. */ virtual bool filterTouchEvents() = 0; /* Determines whether to turn on some hacks to improve touch interaction with another device * where touch coordinate data can get corrupted. */ virtual bool filterJumpyTouchEvents() = 0; /* Gets the configured virtual key definitions for an input device. */ virtual void getVirtualKeyDefinitions(const String8& deviceName, Vector& outVirtualKeyDefinitions) = 0; /* Gets the excluded device names for the platform. */ virtual void getExcludedDeviceNames(Vector& outExcludedDeviceNames) = 0; }; /* Processes raw input events and sends cooked event data to an input dispatcher. */ class InputReaderInterface : public virtual RefBase { protected: InputReaderInterface() { } virtual ~InputReaderInterface() { } public: /* Runs a single iteration of the processing loop. * Nominally reads and processes one incoming message from the EventHub. * * This method should be called on the input reader thread. */ virtual void loopOnce() = 0; /* Gets the current input device configuration. * * This method may be called on any thread (usually by the input manager). */ virtual void getInputConfiguration(InputConfiguration* outConfiguration) = 0; /* Gets information about the specified input device. * Returns OK if the device information was obtained or NAME_NOT_FOUND if there * was no such device. * * This method may be called on any thread (usually by the input manager). */ virtual status_t getInputDeviceInfo(int32_t deviceId, InputDeviceInfo* outDeviceInfo) = 0; /* Gets the list of all registered device ids. */ virtual void getInputDeviceIds(Vector& outDeviceIds) = 0; /* Query current input state. */ virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask, int32_t scanCode) = 0; virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask, int32_t keyCode) = 0; virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask, int32_t sw) = 0; /* Determine whether physical keys exist for the given framework-domain key codes. */ virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) = 0; }; /* Internal interface used by individual input devices to access global input device state * and parameters maintained by the input reader. */ class InputReaderContext { protected: InputReaderContext() { } virtual ~InputReaderContext() { } public: virtual void updateGlobalMetaState() = 0; virtual int32_t getGlobalMetaState() = 0; virtual InputReaderPolicyInterface* getPolicy() = 0; virtual InputDispatcherInterface* getDispatcher() = 0; virtual EventHubInterface* getEventHub() = 0; }; /* The input reader reads raw event data from the event hub and processes it into input events * that it sends to the input dispatcher. Some functions of the input reader, such as early * event filtering in low power states, are controlled by a separate policy object. * * IMPORTANT INVARIANT: * Because the policy and dispatcher can potentially block or cause re-entrance into * the input reader, the input reader never calls into other components while holding * an exclusive internal lock whenever re-entrance can happen. */ class InputReader : public InputReaderInterface, private InputReaderContext { public: InputReader(const sp& eventHub, const sp& policy, const sp& dispatcher); virtual ~InputReader(); virtual void loopOnce(); virtual void getInputConfiguration(InputConfiguration* outConfiguration); virtual status_t getInputDeviceInfo(int32_t deviceId, InputDeviceInfo* outDeviceInfo); virtual void getInputDeviceIds(Vector& outDeviceIds); virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask, int32_t scanCode); virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask, int32_t keyCode); virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask, int32_t sw); virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); private: sp mEventHub; sp mPolicy; sp mDispatcher; virtual InputReaderPolicyInterface* getPolicy() { return mPolicy.get(); } virtual InputDispatcherInterface* getDispatcher() { return mDispatcher.get(); } virtual EventHubInterface* getEventHub() { return mEventHub.get(); } // This reader/writer lock guards the list of input devices. // The writer lock must be held whenever the list of input devices is modified // and then promptly released. // The reader lock must be held whenever the list of input devices is traversed or an // input device in the list is accessed. // This lock only protects the registry and prevents inadvertent deletion of device objects // that are in use. Individual devices are responsible for guarding their own internal state // as needed for concurrent operation. RWLock mDeviceRegistryLock; KeyedVector mDevices; // low-level input event decoding and device management void process(const RawEvent* rawEvent); void addDevice(nsecs_t when, int32_t deviceId); void removeDevice(nsecs_t when, int32_t deviceId); InputDevice* createDevice(int32_t deviceId, const String8& name, uint32_t classes); void configureExcludedDevices(); void consumeEvent(const RawEvent* rawEvent); void handleConfigurationChanged(nsecs_t when); // state management for all devices Mutex mStateLock; int32_t mGlobalMetaState; virtual void updateGlobalMetaState(); virtual int32_t getGlobalMetaState(); InputConfiguration mInputConfiguration; void updateInputConfiguration(); // state queries typedef int32_t (InputDevice::*GetStateFunc)(uint32_t sourceMask, int32_t code); int32_t getState(int32_t deviceId, uint32_t sourceMask, int32_t code, GetStateFunc getStateFunc); bool markSupportedKeyCodes(int32_t deviceId, uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); }; /* Reads raw events from the event hub and processes them, endlessly. */ class InputReaderThread : public Thread { public: InputReaderThread(const sp& reader); virtual ~InputReaderThread(); private: sp mReader; virtual bool threadLoop(); }; /* Represents the state of a single input device. */ class InputDevice { public: InputDevice(InputReaderContext* context, int32_t id, const String8& name); ~InputDevice(); inline InputReaderContext* getContext() { return mContext; } inline int32_t getId() { return mId; } inline const String8& getName() { return mName; } inline uint32_t getSources() { return mSources; } inline bool isIgnored() { return mMappers.isEmpty(); } void addMapper(InputMapper* mapper); void configure(); void reset(); void process(const RawEvent* rawEvent); void getDeviceInfo(InputDeviceInfo* outDeviceInfo); int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode); int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode); int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode); bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); int32_t getMetaState(); private: InputReaderContext* mContext; int32_t mId; Vector mMappers; String8 mName; uint32_t mSources; typedef int32_t (InputMapper::*GetStateFunc)(uint32_t sourceMask, int32_t code); int32_t getState(uint32_t sourceMask, int32_t code, GetStateFunc getStateFunc); }; /* An input mapper transforms raw input events into cooked event data. * A single input device can have multiple associated input mappers in order to interpret * different classes of events. */ class InputMapper { public: InputMapper(InputDevice* device); virtual ~InputMapper(); inline InputDevice* getDevice() { return mDevice; } inline int32_t getDeviceId() { return mDevice->getId(); } inline const String8 getDeviceName() { return mDevice->getName(); } inline InputReaderContext* getContext() { return mContext; } inline InputReaderPolicyInterface* getPolicy() { return mContext->getPolicy(); } inline InputDispatcherInterface* getDispatcher() { return mContext->getDispatcher(); } inline EventHubInterface* getEventHub() { return mContext->getEventHub(); } virtual uint32_t getSources() = 0; virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo); virtual void configure(); virtual void reset(); virtual void process(const RawEvent* rawEvent) = 0; virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode); virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode); virtual int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode); virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); virtual int32_t getMetaState(); protected: InputDevice* mDevice; InputReaderContext* mContext; bool applyStandardPolicyActions(nsecs_t when, int32_t policyActions); }; class SwitchInputMapper : public InputMapper { public: SwitchInputMapper(InputDevice* device); virtual ~SwitchInputMapper(); virtual uint32_t getSources(); virtual void process(const RawEvent* rawEvent); virtual int32_t getSwitchState(uint32_t sourceMask, int32_t switchCode); private: void processSwitch(nsecs_t when, int32_t switchCode, int32_t switchValue); }; class KeyboardInputMapper : public InputMapper { public: KeyboardInputMapper(InputDevice* device, int32_t associatedDisplayId, uint32_t sources, int32_t keyboardType); virtual ~KeyboardInputMapper(); virtual uint32_t getSources(); virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo); virtual void reset(); virtual void process(const RawEvent* rawEvent); virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode); virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode); virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); virtual int32_t getMetaState(); private: Mutex mLock; struct KeyDown { int32_t keyCode; int32_t scanCode; }; int32_t mAssociatedDisplayId; uint32_t mSources; int32_t mKeyboardType; struct LockedState { Vector keyDowns; // keys that are down int32_t metaState; nsecs_t downTime; // time of most recent key down } mLocked; void initializeLocked(); bool isKeyboardOrGamepadKey(int32_t scanCode); void processKey(nsecs_t when, bool down, int32_t keyCode, int32_t scanCode, uint32_t policyFlags); void applyPolicyAndDispatch(nsecs_t when, uint32_t policyFlags, bool down, int32_t keyCode, int32_t scanCode, int32_t metaState, nsecs_t downTime); ssize_t findKeyDownLocked(int32_t scanCode); }; class TrackballInputMapper : public InputMapper { public: TrackballInputMapper(InputDevice* device, int32_t associatedDisplayId); virtual ~TrackballInputMapper(); virtual uint32_t getSources(); virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo); virtual void reset(); virtual void process(const RawEvent* rawEvent); virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode); private: // Amount that trackball needs to move in order to generate a key event. static const int32_t TRACKBALL_MOVEMENT_THRESHOLD = 6; Mutex mLock; int32_t mAssociatedDisplayId; struct Accumulator { enum { FIELD_BTN_MOUSE = 1, FIELD_REL_X = 2, FIELD_REL_Y = 4 }; uint32_t fields; bool btnMouse; int32_t relX; int32_t relY; inline void clear() { fields = 0; } } mAccumulator; float mXScale; float mYScale; float mXPrecision; float mYPrecision; struct LockedState { bool down; nsecs_t downTime; } mLocked; void initializeLocked(); void sync(nsecs_t when); void applyPolicyAndDispatch(nsecs_t when, int32_t motionEventAction, PointerCoords* pointerCoords, nsecs_t downTime); }; class TouchInputMapper : public InputMapper { public: TouchInputMapper(InputDevice* device, int32_t associatedDisplayId); virtual ~TouchInputMapper(); virtual uint32_t getSources(); virtual void populateDeviceInfo(InputDeviceInfo* deviceInfo); virtual void configure(); virtual void reset(); virtual int32_t getKeyCodeState(uint32_t sourceMask, int32_t keyCode); virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode); virtual bool markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags); protected: /* Maximum pointer id value supported. * (This is limited by our use of BitSet32 to track pointer assignments.) */ static const uint32_t MAX_POINTER_ID = 31; Mutex mLock; struct VirtualKey { int32_t keyCode; int32_t scanCode; uint32_t flags; // computed hit box, specified in touch screen coords based on known display size int32_t hitLeft; int32_t hitTop; int32_t hitRight; int32_t hitBottom; inline bool isHit(int32_t x, int32_t y) const { return x >= hitLeft && x <= hitRight && y >= hitTop && y <= hitBottom; } }; struct PointerData { uint32_t id; int32_t x; int32_t y; int32_t pressure; int32_t size; int32_t touchMajor; int32_t touchMinor; int32_t toolMajor; int32_t toolMinor; int32_t orientation; }; struct TouchData { uint32_t pointerCount; PointerData pointers[MAX_POINTERS]; BitSet32 idBits; uint32_t idToIndex[MAX_POINTER_ID + 1]; void copyFrom(const TouchData& other) { pointerCount = other.pointerCount; idBits = other.idBits; for (uint32_t i = 0; i < pointerCount; i++) { pointers[i] = other.pointers[i]; int id = pointers[i].id; idToIndex[id] = other.idToIndex[id]; } } inline void clear() { pointerCount = 0; idBits.clear(); } }; int32_t mAssociatedDisplayId; // Immutable configuration parameters. struct Parameters { bool useBadTouchFilter; bool useJumpyTouchFilter; bool useAveragingTouchFilter; } mParameters; // Raw axis information. struct Axes { RawAbsoluteAxisInfo x; RawAbsoluteAxisInfo y; RawAbsoluteAxisInfo pressure; RawAbsoluteAxisInfo size; RawAbsoluteAxisInfo touchMajor; RawAbsoluteAxisInfo touchMinor; RawAbsoluteAxisInfo toolMajor; RawAbsoluteAxisInfo toolMinor; RawAbsoluteAxisInfo orientation; } mAxes; // Current and previous touch sample data. TouchData mCurrentTouch; TouchData mLastTouch; // The time the primary pointer last went down. nsecs_t mDownTime; struct LockedState { Vector virtualKeys; // The surface orientation and width and height set by configureSurfaceLocked(). int32_t surfaceOrientation; int32_t surfaceWidth, surfaceHeight; // Translation and scaling factors, orientation-independent. int32_t xOrigin; float xScale; float xPrecision; int32_t yOrigin; float yScale; float yPrecision; int32_t pressureOrigin; float pressureScale; int32_t sizeOrigin; float sizeScale; float orientationScale; // Oriented motion ranges for input device info. struct OrientedRanges { InputDeviceInfo::MotionRange x; InputDeviceInfo::MotionRange y; InputDeviceInfo::MotionRange pressure; InputDeviceInfo::MotionRange size; InputDeviceInfo::MotionRange touchMajor; InputDeviceInfo::MotionRange touchMinor; InputDeviceInfo::MotionRange toolMajor; InputDeviceInfo::MotionRange toolMinor; InputDeviceInfo::MotionRange orientation; } orientedRanges; // Oriented dimensions and precision. float orientedSurfaceWidth, orientedSurfaceHeight; float orientedXPrecision, orientedYPrecision; struct CurrentVirtualKeyState { bool down; nsecs_t downTime; int32_t keyCode; int32_t scanCode; } currentVirtualKey; } mLocked; virtual void configureAxes(); virtual bool configureSurfaceLocked(); virtual void configureVirtualKeysLocked(); enum TouchResult { // Dispatch the touch normally. DISPATCH_TOUCH, // Do not dispatch the touch, but keep tracking the current stroke. SKIP_TOUCH, // Do not dispatch the touch, and drop all information associated with the current stoke // so the next movement will appear as a new down. DROP_STROKE }; void syncTouch(nsecs_t when, bool havePointerIds); private: /* Maximum number of historical samples to average. */ static const uint32_t AVERAGING_HISTORY_SIZE = 5; /* Slop distance for jumpy pointer detection. * The vertical range of the screen divided by this is our epsilon value. */ static const uint32_t JUMPY_EPSILON_DIVISOR = 212; /* Number of jumpy points to drop for touchscreens that need it. */ static const uint32_t JUMPY_TRANSITION_DROPS = 3; static const uint32_t JUMPY_DROP_LIMIT = 3; /* Maximum squared distance for averaging. * If moving farther than this, turn of averaging to avoid lag in response. */ static const uint64_t AVERAGING_DISTANCE_LIMIT = 75 * 75; struct AveragingTouchFilterState { // Individual history tracks are stored by pointer id uint32_t historyStart[MAX_POINTERS]; uint32_t historyEnd[MAX_POINTERS]; struct { struct { int32_t x; int32_t y; int32_t pressure; } pointers[MAX_POINTERS]; } historyData[AVERAGING_HISTORY_SIZE]; } mAveragingTouchFilter; struct JumpyTouchFilterState { uint32_t jumpyPointsDropped; } mJumpyTouchFilter; struct PointerDistanceHeapElement { uint32_t currentPointerIndex : 8; uint32_t lastPointerIndex : 8; uint64_t distance : 48; // squared distance }; void initializeLocked(); TouchResult consumeOffScreenTouches(nsecs_t when, uint32_t policyFlags); void dispatchTouches(nsecs_t when, uint32_t policyFlags); void dispatchTouch(nsecs_t when, uint32_t policyFlags, TouchData* touch, BitSet32 idBits, uint32_t changedId, int32_t motionEventAction); void applyPolicyAndDispatchVirtualKey(nsecs_t when, uint32_t policyFlags, int32_t keyEventAction, int32_t keyEventFlags, int32_t keyCode, int32_t scanCode, nsecs_t downTime); bool isPointInsideSurfaceLocked(int32_t x, int32_t y); const VirtualKey* findVirtualKeyHitLocked(int32_t x, int32_t y); bool applyBadTouchFilter(); bool applyJumpyTouchFilter(); void applyAveragingTouchFilter(); void calculatePointerIds(); }; class SingleTouchInputMapper : public TouchInputMapper { public: SingleTouchInputMapper(InputDevice* device, int32_t associatedDisplayId); virtual ~SingleTouchInputMapper(); virtual void reset(); virtual void process(const RawEvent* rawEvent); protected: virtual void configureAxes(); private: struct Accumulator { enum { FIELD_BTN_TOUCH = 1, FIELD_ABS_X = 2, FIELD_ABS_Y = 4, FIELD_ABS_PRESSURE = 8, FIELD_ABS_TOOL_WIDTH = 16 }; uint32_t fields; bool btnTouch; int32_t absX; int32_t absY; int32_t absPressure; int32_t absToolWidth; inline void clear() { fields = 0; } } mAccumulator; bool mDown; int32_t mX; int32_t mY; int32_t mPressure; int32_t mSize; void initialize(); void sync(nsecs_t when); }; class MultiTouchInputMapper : public TouchInputMapper { public: MultiTouchInputMapper(InputDevice* device, int32_t associatedDisplayId); virtual ~MultiTouchInputMapper(); virtual void reset(); virtual void process(const RawEvent* rawEvent); protected: virtual void configureAxes(); private: struct Accumulator { enum { FIELD_ABS_MT_POSITION_X = 1, FIELD_ABS_MT_POSITION_Y = 2, FIELD_ABS_MT_TOUCH_MAJOR = 4, FIELD_ABS_MT_TOUCH_MINOR = 8, FIELD_ABS_MT_WIDTH_MAJOR = 16, FIELD_ABS_MT_WIDTH_MINOR = 32, FIELD_ABS_MT_ORIENTATION = 64, FIELD_ABS_MT_TRACKING_ID = 128, FIELD_ABS_MT_PRESSURE = 256, }; uint32_t pointerCount; struct Pointer { uint32_t fields; int32_t absMTPositionX; int32_t absMTPositionY; int32_t absMTTouchMajor; int32_t absMTTouchMinor; int32_t absMTWidthMajor; int32_t absMTWidthMinor; int32_t absMTOrientation; int32_t absMTTrackingId; int32_t absMTPressure; inline void clear() { fields = 0; } } pointers[MAX_POINTERS + 1]; // + 1 to remove the need for extra range checks inline void clear() { pointerCount = 0; pointers[0].clear(); } } mAccumulator; void initialize(); void sync(nsecs_t when); }; } // namespace android #endif // _UI_INPUT_READER_H