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Diffstat (limited to 'include/ui/InputReader.h')
| -rw-r--r-- | include/ui/InputReader.h | 954 |
1 files changed, 954 insertions, 0 deletions
diff --git a/include/ui/InputReader.h b/include/ui/InputReader.h new file mode 100644 index 000000000000..903c3c4fadad --- /dev/null +++ b/include/ui/InputReader.h @@ -0,0 +1,954 @@ +/* + * 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 <ui/EventHub.h> +#include <ui/Input.h> +#include <ui/InputDispatcher.h> +#include <utils/KeyedVector.h> +#include <utils/threads.h> +#include <utils/Timers.h> +#include <utils/RefBase.h> +#include <utils/String8.h> +#include <utils/BitSet.h> + +#include <stddef.h> +#include <unistd.h> + +namespace android { + +class InputDevice; +class InputMapper; + +/* 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; +}; + + +/* Specifies input device calibration settings. */ +class InputDeviceCalibration { +public: + InputDeviceCalibration(); + + void clear(); + void addProperty(const String8& key, const String8& value); + + bool tryGetProperty(const String8& key, String8& outValue) const; + bool tryGetProperty(const String8& key, int32_t& outValue) const; + bool tryGetProperty(const String8& key, float& outValue) const; + +private: + KeyedVector<String8, String8> mProperties; +}; + + +/* + * 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, + }; + + /* 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<VirtualKeyDefinition>& outVirtualKeyDefinitions) = 0; + + /* Gets the calibration for an input device. */ + virtual void getInputDeviceCalibration(const String8& deviceName, + InputDeviceCalibration& outCalibration) = 0; + + /* Gets the excluded device names for the platform. */ + virtual void getExcludedDeviceNames(Vector<String8>& 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: + /* Dumps the state of the input reader. + * + * This method may be called on any thread (usually by the input manager). */ + virtual void dump(String8& dump) = 0; + + /* 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<int32_t>& 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<EventHubInterface>& eventHub, + const sp<InputReaderPolicyInterface>& policy, + const sp<InputDispatcherInterface>& dispatcher); + virtual ~InputReader(); + + virtual void dump(String8& dump); + + virtual void loopOnce(); + + virtual void getInputConfiguration(InputConfiguration* outConfiguration); + + virtual status_t getInputDeviceInfo(int32_t deviceId, InputDeviceInfo* outDeviceInfo); + virtual void getInputDeviceIds(Vector<int32_t>& 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<EventHubInterface> mEventHub; + sp<InputReaderPolicyInterface> mPolicy; + sp<InputDispatcherInterface> 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<int32_t, InputDevice*> 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); + + // dump state + void dumpDeviceInfo(String8& dump); +}; + + +/* Reads raw events from the event hub and processes them, endlessly. */ +class InputReaderThread : public Thread { +public: + InputReaderThread(const sp<InputReaderInterface>& reader); + virtual ~InputReaderThread(); + +private: + sp<InputReaderInterface> 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(); + + inline const InputDeviceCalibration& getCalibration() { + return mCalibration; + } + +private: + InputReaderContext* mContext; + int32_t mId; + + Vector<InputMapper*> 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); + + InputDeviceCalibration mCalibration; +}; + + +/* 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<KeyDown> 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; + } + }; + + // Raw data for a single pointer. + struct PointerData { + uint32_t id; + int32_t x; + int32_t y; + int32_t pressure; + int32_t touchMajor; + int32_t touchMinor; + int32_t toolMajor; + int32_t toolMinor; + int32_t orientation; + }; + + // Raw data for a collection of pointers including a pointer id mapping table. + 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; + + // Immutable calibration parameters in parsed form. + struct Calibration { + // Touch Area + enum TouchAreaCalibration { + TOUCH_AREA_CALIBRATION_DEFAULT, + TOUCH_AREA_CALIBRATION_NONE, + TOUCH_AREA_CALIBRATION_GEOMETRIC, + TOUCH_AREA_CALIBRATION_PRESSURE, + }; + + TouchAreaCalibration touchAreaCalibration; + + // Tool Area + enum ToolAreaCalibration { + TOOL_AREA_CALIBRATION_DEFAULT, + TOOL_AREA_CALIBRATION_NONE, + TOOL_AREA_CALIBRATION_GEOMETRIC, + TOOL_AREA_CALIBRATION_LINEAR, + }; + + ToolAreaCalibration toolAreaCalibration; + bool haveToolAreaLinearScale; + float toolAreaLinearScale; + bool haveToolAreaLinearBias; + float toolAreaLinearBias; + bool haveToolAreaIsSummed; + int32_t toolAreaIsSummed; + + // Pressure + enum PressureCalibration { + PRESSURE_CALIBRATION_DEFAULT, + PRESSURE_CALIBRATION_NONE, + PRESSURE_CALIBRATION_PHYSICAL, + PRESSURE_CALIBRATION_AMPLITUDE, + }; + enum PressureSource { + PRESSURE_SOURCE_DEFAULT, + PRESSURE_SOURCE_PRESSURE, + PRESSURE_SOURCE_TOUCH, + }; + + PressureCalibration pressureCalibration; + PressureSource pressureSource; + bool havePressureScale; + float pressureScale; + + // Size + enum SizeCalibration { + SIZE_CALIBRATION_DEFAULT, + SIZE_CALIBRATION_NONE, + SIZE_CALIBRATION_NORMALIZED, + }; + + SizeCalibration sizeCalibration; + + // Orientation + enum OrientationCalibration { + ORIENTATION_CALIBRATION_DEFAULT, + ORIENTATION_CALIBRATION_NONE, + ORIENTATION_CALIBRATION_INTERPOLATED, + }; + + OrientationCalibration orientationCalibration; + } mCalibration; + + // Raw axis information from the driver. + struct RawAxes { + RawAbsoluteAxisInfo x; + RawAbsoluteAxisInfo y; + RawAbsoluteAxisInfo pressure; + RawAbsoluteAxisInfo touchMajor; + RawAbsoluteAxisInfo touchMinor; + RawAbsoluteAxisInfo toolMajor; + RawAbsoluteAxisInfo toolMinor; + RawAbsoluteAxisInfo orientation; + } mRawAxes; + + // Current and previous touch sample data. + TouchData mCurrentTouch; + TouchData mLastTouch; + + // The time the primary pointer last went down. + nsecs_t mDownTime; + + struct LockedState { + Vector<VirtualKey> 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; + + float geometricScale; + + float toolAreaLinearScale; + float toolAreaLinearBias; + + float pressureScale; + + float sizeScale; + + float orientationScale; + + // Oriented motion ranges for input device info. + struct OrientedRanges { + InputDeviceInfo::MotionRange x; + InputDeviceInfo::MotionRange y; + + bool havePressure; + InputDeviceInfo::MotionRange pressure; + + bool haveSize; + InputDeviceInfo::MotionRange size; + + bool haveTouchArea; + InputDeviceInfo::MotionRange touchMajor; + InputDeviceInfo::MotionRange touchMinor; + + bool haveToolArea; + InputDeviceInfo::MotionRange toolMajor; + InputDeviceInfo::MotionRange toolMinor; + + bool haveOrientation; + 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 configureParameters(); + virtual void logParameters(); + virtual void configureRawAxes(); + virtual void logRawAxes(); + virtual bool configureSurfaceLocked(); + virtual void logMotionRangesLocked(); + virtual void configureVirtualKeysLocked(); + virtual void parseCalibration(); + virtual void resolveCalibration(); + virtual void logCalibration(); + + 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, uint32_t pointerCount, + 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 configureRawAxes(); + +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 mToolWidth; + + 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 configureRawAxes(); + +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 |