services/inputflinger/include/InputReaderBase.h - platform/frameworks/native - Gitiles

 /*
  * Copyright (C) 2018 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_BASE_H
 #define _UI_INPUT_READER_BASE_H

 #include <input/DisplayViewport.h>
 #include <input/Input.h>
 #include <input/InputDevice.h>
 #include <input/VelocityControl.h>
 #include <input/VelocityTracker.h>
 #include <stddef.h>
 #include <unistd.h>
 #include <utils/Errors.h>
 #include <utils/RefBase.h>

 #include <optional>
 #include <set>
 #include <unordered_map>
 #include <vector>

 #include "PointerControllerInterface.h"
 #include "VibrationElement.h"

 // Maximum supported size of a vibration pattern.
 // Must be at least 2.
 #define MAX_VIBRATE_PATTERN_SIZE 100

 namespace android {

 // --- InputReaderInterface ---

 /* The interface for the InputReader shared library.
  *
  * Manages one or more threads that process raw input events and sends cooked event data to an
  * input listener.
  *
  * The implementation must guarantee thread safety for this interface. However, since the input
  * listener is NOT thread safe, all calls to the listener must happen from the same thread.
  */
 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(std::string& dump) = 0;

     /* Called by the heartbeat to ensures that the reader has not deadlocked. */
     virtual void monitor() = 0;

     /* Returns true if the input device is enabled. */
     virtual bool isInputDeviceEnabled(int32_t deviceId) = 0;

     /* Makes the reader start processing events from the kernel. */
     virtual status_t start() = 0;

     /* Makes the reader stop processing any more events. */
     virtual status_t stop() = 0;

     /* Gets information about all input devices.
      *
      * This method may be called on any thread (usually by the input manager).
      */
     virtual std::vector<InputDeviceInfo> getInputDevices() const = 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;

     /* Toggle Caps Lock */
     virtual void toggleCapsLockState(int32_t deviceId) = 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;

     /* Requests that a reconfiguration of all input devices.
      * The changes flag is a bitfield that indicates what has changed and whether
      * the input devices must all be reopened. */
     virtual void requestRefreshConfiguration(uint32_t changes) = 0;

     /* Controls the vibrator of a particular input device. */
     virtual void vibrate(int32_t deviceId, const VibrationSequence& sequence, ssize_t repeat,
                          int32_t token) = 0;
     virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;

     virtual bool isVibrating(int32_t deviceId) = 0;

     virtual std::vector<int32_t> getVibratorIds(int32_t deviceId) = 0;
     /* Get battery level of a particular input device. */
     virtual std::optional<int32_t> getBatteryCapacity(int32_t deviceId) = 0;
     /* Get battery status of a particular input device. */
     virtual std::optional<int32_t> getBatteryStatus(int32_t deviceId) = 0;

     virtual std::vector<InputDeviceLightInfo> getLights(int32_t deviceId) = 0;

     virtual std::vector<InputDeviceSensorInfo> getSensors(int32_t deviceId) = 0;

     /* Return true if the device can send input events to the specified display. */
     virtual bool canDispatchToDisplay(int32_t deviceId, int32_t displayId) = 0;

     /* Enable sensor in input reader mapper. */
     virtual bool enableSensor(int32_t deviceId, InputDeviceSensorType sensorType,
                               std::chrono::microseconds samplingPeriod,
                               std::chrono::microseconds maxBatchReportLatency) = 0;

     /* Disable sensor in input reader mapper. */
     virtual void disableSensor(int32_t deviceId, InputDeviceSensorType sensorType) = 0;

     /* Flush sensor data in input reader mapper. */
     virtual void flushSensor(int32_t deviceId, InputDeviceSensorType sensorType) = 0;

     /* Set color for the light */
     virtual bool setLightColor(int32_t deviceId, int32_t lightId, int32_t color) = 0;
     /* Set player ID for the light */
     virtual bool setLightPlayerId(int32_t deviceId, int32_t lightId, int32_t playerId) = 0;
     /* Get light color */
     virtual std::optional<int32_t> getLightColor(int32_t deviceId, int32_t lightId) = 0;
     /* Get light player ID */
     virtual std::optional<int32_t> getLightPlayerId(int32_t deviceId, int32_t lightId) = 0;
 };

 // --- InputReaderConfiguration ---

 /*
  * Input reader configuration.
  *
  * Specifies various options that modify the behavior of the input reader.
  */
 struct InputReaderConfiguration {
     // Describes changes that have occurred.
     enum {
         // The pointer speed changed.
         CHANGE_POINTER_SPEED = 1 << 0,

         // The pointer gesture control changed.
         CHANGE_POINTER_GESTURE_ENABLEMENT = 1 << 1,

         // The display size or orientation changed.
         CHANGE_DISPLAY_INFO = 1 << 2,

         // The visible touches option changed.
         CHANGE_SHOW_TOUCHES = 1 << 3,

         // The keyboard layouts must be reloaded.
         CHANGE_KEYBOARD_LAYOUTS = 1 << 4,

         // The device name alias supplied by the may have changed for some devices.
         CHANGE_DEVICE_ALIAS = 1 << 5,

         // The location calibration matrix changed.
         CHANGE_TOUCH_AFFINE_TRANSFORMATION = 1 << 6,

         // The presence of an external stylus has changed.
         CHANGE_EXTERNAL_STYLUS_PRESENCE = 1 << 7,

         // The pointer capture mode has changed.
         CHANGE_POINTER_CAPTURE = 1 << 8,

         // The set of disabled input devices (disabledDevices) has changed.
         CHANGE_ENABLED_STATE = 1 << 9,

         // All devices must be reopened.
         CHANGE_MUST_REOPEN = 1 << 31,
     };

     // Gets the amount of time to disable virtual keys after the screen is touched
     // in order to filter out accidental virtual key presses due to swiping gestures
     // or taps near the edge of the display.  May be 0 to disable the feature.
     nsecs_t virtualKeyQuietTime;

     // The excluded device names for the platform.
     // Devices with these names will be ignored.
     std::vector<std::string> excludedDeviceNames;

     // The associations between input ports and display ports.
     // Used to determine which DisplayViewport should be tied to which InputDevice.
     std::unordered_map<std::string, uint8_t> portAssociations;

     // The associations between input device names and display unique ids.
     // Used to determine which DisplayViewport should be tied to which InputDevice.
     std::unordered_map<std::string, std::string> uniqueIdAssociations;

     // The suggested display ID to show the cursor.
     int32_t defaultPointerDisplayId;

     // Velocity control parameters for mouse pointer movements.
     VelocityControlParameters pointerVelocityControlParameters;

     // Velocity control parameters for mouse wheel movements.
     VelocityControlParameters wheelVelocityControlParameters;

     // True if pointer gestures are enabled.
     bool pointerGesturesEnabled;

     // Quiet time between certain pointer gesture transitions.
     // Time to allow for all fingers or buttons to settle into a stable state before
     // starting a new gesture.
     nsecs_t pointerGestureQuietInterval;

     // The minimum speed that a pointer must travel for us to consider switching the active
     // touch pointer to it during a drag.  This threshold is set to avoid switching due
     // to noise from a finger resting on the touch pad (perhaps just pressing it down).
     float pointerGestureDragMinSwitchSpeed; // in pixels per second

     // Tap gesture delay time.
     // The time between down and up must be less than this to be considered a tap.
     nsecs_t pointerGestureTapInterval;

     // Tap drag gesture delay time.
     // The time between the previous tap's up and the next down must be less than
     // this to be considered a drag.  Otherwise, the previous tap is finished and a
     // new tap begins.
     //
     // Note that the previous tap will be held down for this entire duration so this
     // interval must be shorter than the long press timeout.
     nsecs_t pointerGestureTapDragInterval;

     // The distance in pixels that the pointer is allowed to move from initial down
     // to up and still be called a tap.
     float pointerGestureTapSlop; // in pixels

     // Time after the first touch points go down to settle on an initial centroid.
     // This is intended to be enough time to handle cases where the user puts down two
     // fingers at almost but not quite exactly the same time.
     nsecs_t pointerGestureMultitouchSettleInterval;

     // The transition from PRESS to SWIPE or FREEFORM gesture mode is made when
     // at least two pointers have moved at least this far from their starting place.
     float pointerGestureMultitouchMinDistance; // in pixels

     // The transition from PRESS to SWIPE gesture mode can only occur when the
     // cosine of the angle between the two vectors is greater than or equal to than this value
     // which indicates that the vectors are oriented in the same direction.
     // When the vectors are oriented in the exactly same direction, the cosine is 1.0.
     // (In exactly opposite directions, the cosine is -1.0.)
     float pointerGestureSwipeTransitionAngleCosine;

     // The transition from PRESS to SWIPE gesture mode can only occur when the
     // fingers are no more than this far apart relative to the diagonal size of
     // the touch pad.  For example, a ratio of 0.5 means that the fingers must be
     // no more than half the diagonal size of the touch pad apart.
     float pointerGestureSwipeMaxWidthRatio;

     // The gesture movement speed factor relative to the size of the display.
     // Movement speed applies when the fingers are moving in the same direction.
     // Without acceleration, a full swipe of the touch pad diagonal in movement mode
     // will cover this portion of the display diagonal.
     float pointerGestureMovementSpeedRatio;

     // The gesture zoom speed factor relative to the size of the display.
     // Zoom speed applies when the fingers are mostly moving relative to each other
     // to execute a scale gesture or similar.
     // Without acceleration, a full swipe of the touch pad diagonal in zoom mode
     // will cover this portion of the display diagonal.
     float pointerGestureZoomSpeedRatio;

     // True to show the location of touches on the touch screen as spots.
     bool showTouches;

     // The latest request to enable or disable Pointer Capture.
     PointerCaptureRequest pointerCaptureRequest;

     // The set of currently disabled input devices.
     std::set<int32_t> disabledDevices;

     InputReaderConfiguration()
           : virtualKeyQuietTime(0),
             pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
             wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
             pointerGesturesEnabled(true),
             pointerGestureQuietInterval(100 * 1000000LL),            // 100 ms
             pointerGestureDragMinSwitchSpeed(50),                    // 50 pixels per second
             pointerGestureTapInterval(150 * 1000000LL),              // 150 ms
             pointerGestureTapDragInterval(150 * 1000000LL),          // 150 ms
             pointerGestureTapSlop(10.0f),                            // 10 pixels
             pointerGestureMultitouchSettleInterval(100 * 1000000LL), // 100 ms
             pointerGestureMultitouchMinDistance(15),                 // 15 pixels
             pointerGestureSwipeTransitionAngleCosine(0.2588f),       // cosine of 75 degrees
             pointerGestureSwipeMaxWidthRatio(0.25f),
             pointerGestureMovementSpeedRatio(0.8f),
             pointerGestureZoomSpeedRatio(0.3f),
             showTouches(false),
             pointerCaptureRequest() {}

     static std::string changesToString(uint32_t changes);

     std::optional<DisplayViewport> getDisplayViewportByType(ViewportType type) const;
     std::optional<DisplayViewport> getDisplayViewportByUniqueId(const std::string& uniqueDisplayId)
             const;
     std::optional<DisplayViewport> getDisplayViewportByPort(uint8_t physicalPort) const;
     std::optional<DisplayViewport> getDisplayViewportById(int32_t displayId) const;
     void setDisplayViewports(const std::vector<DisplayViewport>& viewports);


     void dump(std::string& dump) const;
     void dumpViewport(std::string& dump, const DisplayViewport& viewport) const;

 private:
     std::vector<DisplayViewport> mDisplays;
 };

 // --- TouchAffineTransformation ---

 struct TouchAffineTransformation {
     float x_scale;
     float x_ymix;
     float x_offset;
     float y_xmix;
     float y_scale;
     float y_offset;

     TouchAffineTransformation() :
         x_scale(1.0f), x_ymix(0.0f), x_offset(0.0f),
         y_xmix(0.0f), y_scale(1.0f), y_offset(0.0f) {
     }

     TouchAffineTransformation(float xscale, float xymix, float xoffset,
             float yxmix, float yscale, float yoffset) :
         x_scale(xscale), x_ymix(xymix), x_offset(xoffset),
         y_xmix(yxmix), y_scale(yscale), y_offset(yoffset) {
     }

     void applyTo(float& x, float& y) const;
 };

 // --- InputReaderPolicyInterface ---

 /*
  * 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.
  *
  * These methods will NOT re-enter the input reader interface, so they may be called from
  * any method in the input reader interface.
  */
 class InputReaderPolicyInterface : public virtual RefBase {
 protected:
     InputReaderPolicyInterface() { }
     virtual ~InputReaderPolicyInterface() { }

 public:
     /* Gets the input reader configuration. */
     virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) = 0;

     /* Gets a pointer controller associated with the specified cursor device (ie. a mouse). */
     virtual std::shared_ptr<PointerControllerInterface> obtainPointerController(
             int32_t deviceId) = 0;

     /* Notifies the input reader policy that some input devices have changed
      * and provides information about all current input devices.
      */
     virtual void notifyInputDevicesChanged(const std::vector<InputDeviceInfo>& inputDevices) = 0;

     /* Gets the keyboard layout for a particular input device. */
     virtual std::shared_ptr<KeyCharacterMap> getKeyboardLayoutOverlay(
             const InputDeviceIdentifier& identifier) = 0;

     /* Gets a user-supplied alias for a particular input device, or an empty string if none. */
     virtual std::string getDeviceAlias(const InputDeviceIdentifier& identifier) = 0;

     /* Gets the affine calibration associated with the specified device. */
     virtual TouchAffineTransformation getTouchAffineTransformation(
             const std::string& inputDeviceDescriptor, int32_t surfaceRotation) = 0;
 };

 } // namespace android

 #endif // _UI_INPUT_READER_COMMON_H
	/*
	* Copyright (C) 2018 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_BASE_H
	#define _UI_INPUT_READER_BASE_H

	#include <input/DisplayViewport.h>
	#include <input/Input.h>
	#include <input/InputDevice.h>
	#include <input/VelocityControl.h>
	#include <input/VelocityTracker.h>
	#include <stddef.h>
	#include <unistd.h>
	#include <utils/Errors.h>
	#include <utils/RefBase.h>

	#include <optional>
	#include <set>
	#include <unordered_map>
	#include <vector>

	#include "PointerControllerInterface.h"
	#include "VibrationElement.h"

	// Maximum supported size of a vibration pattern.
	// Must be at least 2.
	#define MAX_VIBRATE_PATTERN_SIZE 100

	namespace android {

	// --- InputReaderInterface ---

	/* The interface for the InputReader shared library.
	*
	* Manages one or more threads that process raw input events and sends cooked event data to an
	* input listener.
	*
	* The implementation must guarantee thread safety for this interface. However, since the input
	* listener is NOT thread safe, all calls to the listener must happen from the same thread.
	*/
	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(std::string& dump) = 0;

	/* Called by the heartbeat to ensures that the reader has not deadlocked. */
	virtual void monitor() = 0;

	/* Returns true if the input device is enabled. */
	virtual bool isInputDeviceEnabled(int32_t deviceId) = 0;

	/* Makes the reader start processing events from the kernel. */
	virtual status_t start() = 0;

	/* Makes the reader stop processing any more events. */
	virtual status_t stop() = 0;

	/* Gets information about all input devices.
	*
	* This method may be called on any thread (usually by the input manager).
	*/
	virtual std::vector<InputDeviceInfo> getInputDevices() const = 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;

	/* Toggle Caps Lock */
	virtual void toggleCapsLockState(int32_t deviceId) = 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;

	/* Requests that a reconfiguration of all input devices.
	* The changes flag is a bitfield that indicates what has changed and whether
	* the input devices must all be reopened. */
	virtual void requestRefreshConfiguration(uint32_t changes) = 0;

	/* Controls the vibrator of a particular input device. */
	virtual void vibrate(int32_t deviceId, const VibrationSequence& sequence, ssize_t repeat,
	int32_t token) = 0;
	virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;

	virtual bool isVibrating(int32_t deviceId) = 0;

	virtual std::vector<int32_t> getVibratorIds(int32_t deviceId) = 0;
	/* Get battery level of a particular input device. */
	virtual std::optional<int32_t> getBatteryCapacity(int32_t deviceId) = 0;
	/* Get battery status of a particular input device. */
	virtual std::optional<int32_t> getBatteryStatus(int32_t deviceId) = 0;

	virtual std::vector<InputDeviceLightInfo> getLights(int32_t deviceId) = 0;

	virtual std::vector<InputDeviceSensorInfo> getSensors(int32_t deviceId) = 0;

	/* Return true if the device can send input events to the specified display. */
	virtual bool canDispatchToDisplay(int32_t deviceId, int32_t displayId) = 0;

	/* Enable sensor in input reader mapper. */
	virtual bool enableSensor(int32_t deviceId, InputDeviceSensorType sensorType,
	std::chrono::microseconds samplingPeriod,
	std::chrono::microseconds maxBatchReportLatency) = 0;

	/* Disable sensor in input reader mapper. */
	virtual void disableSensor(int32_t deviceId, InputDeviceSensorType sensorType) = 0;

	/* Flush sensor data in input reader mapper. */
	virtual void flushSensor(int32_t deviceId, InputDeviceSensorType sensorType) = 0;

	/* Set color for the light */
	virtual bool setLightColor(int32_t deviceId, int32_t lightId, int32_t color) = 0;
	/* Set player ID for the light */
	virtual bool setLightPlayerId(int32_t deviceId, int32_t lightId, int32_t playerId) = 0;
	/* Get light color */
	virtual std::optional<int32_t> getLightColor(int32_t deviceId, int32_t lightId) = 0;
	/* Get light player ID */
	virtual std::optional<int32_t> getLightPlayerId(int32_t deviceId, int32_t lightId) = 0;
	};

	// --- InputReaderConfiguration ---

	/*
	* Input reader configuration.
	*
	* Specifies various options that modify the behavior of the input reader.
	*/
	struct InputReaderConfiguration {
	// Describes changes that have occurred.
	enum {
	// The pointer speed changed.
	CHANGE_POINTER_SPEED = 1 << 0,

	// The pointer gesture control changed.
	CHANGE_POINTER_GESTURE_ENABLEMENT = 1 << 1,

	// The display size or orientation changed.
	CHANGE_DISPLAY_INFO = 1 << 2,

	// The visible touches option changed.
	CHANGE_SHOW_TOUCHES = 1 << 3,

	// The keyboard layouts must be reloaded.
	CHANGE_KEYBOARD_LAYOUTS = 1 << 4,

	// The device name alias supplied by the may have changed for some devices.
	CHANGE_DEVICE_ALIAS = 1 << 5,

	// The location calibration matrix changed.
	CHANGE_TOUCH_AFFINE_TRANSFORMATION = 1 << 6,

	// The presence of an external stylus has changed.
	CHANGE_EXTERNAL_STYLUS_PRESENCE = 1 << 7,

	// The pointer capture mode has changed.
	CHANGE_POINTER_CAPTURE = 1 << 8,

	// The set of disabled input devices (disabledDevices) has changed.
	CHANGE_ENABLED_STATE = 1 << 9,

	// All devices must be reopened.
	CHANGE_MUST_REOPEN = 1 << 31,
	};

	// Gets the amount of time to disable virtual keys after the screen is touched
	// in order to filter out accidental virtual key presses due to swiping gestures
	// or taps near the edge of the display. May be 0 to disable the feature.
	nsecs_t virtualKeyQuietTime;

	// The excluded device names for the platform.
	// Devices with these names will be ignored.
	std::vector<std::string> excludedDeviceNames;

	// The associations between input ports and display ports.
	// Used to determine which DisplayViewport should be tied to which InputDevice.
	std::unordered_map<std::string, uint8_t> portAssociations;

	// The associations between input device names and display unique ids.
	// Used to determine which DisplayViewport should be tied to which InputDevice.
	std::unordered_map<std::string, std::string> uniqueIdAssociations;

	// The suggested display ID to show the cursor.
	int32_t defaultPointerDisplayId;

	// Velocity control parameters for mouse pointer movements.
	VelocityControlParameters pointerVelocityControlParameters;

	// Velocity control parameters for mouse wheel movements.
	VelocityControlParameters wheelVelocityControlParameters;

	// True if pointer gestures are enabled.
	bool pointerGesturesEnabled;

	// Quiet time between certain pointer gesture transitions.
	// Time to allow for all fingers or buttons to settle into a stable state before
	// starting a new gesture.
	nsecs_t pointerGestureQuietInterval;

	// The minimum speed that a pointer must travel for us to consider switching the active
	// touch pointer to it during a drag. This threshold is set to avoid switching due
	// to noise from a finger resting on the touch pad (perhaps just pressing it down).
	float pointerGestureDragMinSwitchSpeed; // in pixels per second

	// Tap gesture delay time.
	// The time between down and up must be less than this to be considered a tap.
	nsecs_t pointerGestureTapInterval;

	// Tap drag gesture delay time.
	// The time between the previous tap's up and the next down must be less than
	// this to be considered a drag. Otherwise, the previous tap is finished and a
	// new tap begins.
	//
	// Note that the previous tap will be held down for this entire duration so this
	// interval must be shorter than the long press timeout.
	nsecs_t pointerGestureTapDragInterval;

	// The distance in pixels that the pointer is allowed to move from initial down
	// to up and still be called a tap.
	float pointerGestureTapSlop; // in pixels

	// Time after the first touch points go down to settle on an initial centroid.
	// This is intended to be enough time to handle cases where the user puts down two
	// fingers at almost but not quite exactly the same time.
	nsecs_t pointerGestureMultitouchSettleInterval;

	// The transition from PRESS to SWIPE or FREEFORM gesture mode is made when
	// at least two pointers have moved at least this far from their starting place.
	float pointerGestureMultitouchMinDistance; // in pixels

	// The transition from PRESS to SWIPE gesture mode can only occur when the
	// cosine of the angle between the two vectors is greater than or equal to than this value
	// which indicates that the vectors are oriented in the same direction.
	// When the vectors are oriented in the exactly same direction, the cosine is 1.0.
	// (In exactly opposite directions, the cosine is -1.0.)
	float pointerGestureSwipeTransitionAngleCosine;

	// The transition from PRESS to SWIPE gesture mode can only occur when the
	// fingers are no more than this far apart relative to the diagonal size of
	// the touch pad. For example, a ratio of 0.5 means that the fingers must be
	// no more than half the diagonal size of the touch pad apart.
	float pointerGestureSwipeMaxWidthRatio;

	// The gesture movement speed factor relative to the size of the display.
	// Movement speed applies when the fingers are moving in the same direction.
	// Without acceleration, a full swipe of the touch pad diagonal in movement mode
	// will cover this portion of the display diagonal.
	float pointerGestureMovementSpeedRatio;

	// The gesture zoom speed factor relative to the size of the display.
	// Zoom speed applies when the fingers are mostly moving relative to each other
	// to execute a scale gesture or similar.
	// Without acceleration, a full swipe of the touch pad diagonal in zoom mode
	// will cover this portion of the display diagonal.
	float pointerGestureZoomSpeedRatio;

	// True to show the location of touches on the touch screen as spots.
	bool showTouches;

	// The latest request to enable or disable Pointer Capture.
	PointerCaptureRequest pointerCaptureRequest;

	// The set of currently disabled input devices.
	std::set<int32_t> disabledDevices;

	InputReaderConfiguration()
	: virtualKeyQuietTime(0),
	pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
	wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
	pointerGesturesEnabled(true),
	pointerGestureQuietInterval(100 * 1000000LL), // 100 ms
	pointerGestureDragMinSwitchSpeed(50), // 50 pixels per second
	pointerGestureTapInterval(150 * 1000000LL), // 150 ms
	pointerGestureTapDragInterval(150 * 1000000LL), // 150 ms
	pointerGestureTapSlop(10.0f), // 10 pixels
	pointerGestureMultitouchSettleInterval(100 * 1000000LL), // 100 ms
	pointerGestureMultitouchMinDistance(15), // 15 pixels
	pointerGestureSwipeTransitionAngleCosine(0.2588f), // cosine of 75 degrees
	pointerGestureSwipeMaxWidthRatio(0.25f),
	pointerGestureMovementSpeedRatio(0.8f),
	pointerGestureZoomSpeedRatio(0.3f),
	showTouches(false),
	pointerCaptureRequest() {}

	static std::string changesToString(uint32_t changes);

	std::optional<DisplayViewport> getDisplayViewportByType(ViewportType type) const;
	std::optional<DisplayViewport> getDisplayViewportByUniqueId(const std::string& uniqueDisplayId)
	const;
	std::optional<DisplayViewport> getDisplayViewportByPort(uint8_t physicalPort) const;
	std::optional<DisplayViewport> getDisplayViewportById(int32_t displayId) const;
	void setDisplayViewports(const std::vector<DisplayViewport>& viewports);


	void dump(std::string& dump) const;
	void dumpViewport(std::string& dump, const DisplayViewport& viewport) const;

	private:
	std::vector<DisplayViewport> mDisplays;
	};

	// --- TouchAffineTransformation ---

	struct TouchAffineTransformation {
	float x_scale;
	float x_ymix;
	float x_offset;
	float y_xmix;
	float y_scale;
	float y_offset;

	TouchAffineTransformation() :
	x_scale(1.0f), x_ymix(0.0f), x_offset(0.0f),
	y_xmix(0.0f), y_scale(1.0f), y_offset(0.0f) {
	}

	TouchAffineTransformation(float xscale, float xymix, float xoffset,
	float yxmix, float yscale, float yoffset) :
	x_scale(xscale), x_ymix(xymix), x_offset(xoffset),
	y_xmix(yxmix), y_scale(yscale), y_offset(yoffset) {
	}

	void applyTo(float& x, float& y) const;
	};

	// --- InputReaderPolicyInterface ---

	/*
	* 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.
	*
	* These methods will NOT re-enter the input reader interface, so they may be called from
	* any method in the input reader interface.
	*/
	class InputReaderPolicyInterface : public virtual RefBase {
	protected:
	InputReaderPolicyInterface() { }
	virtual ~InputReaderPolicyInterface() { }

	public:
	/* Gets the input reader configuration. */
	virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) = 0;

	/* Gets a pointer controller associated with the specified cursor device (ie. a mouse). */
	virtual std::shared_ptr<PointerControllerInterface> obtainPointerController(
	int32_t deviceId) = 0;

	/* Notifies the input reader policy that some input devices have changed
	* and provides information about all current input devices.
	*/
	virtual void notifyInputDevicesChanged(const std::vector<InputDeviceInfo>& inputDevices) = 0;

	/* Gets the keyboard layout for a particular input device. */
	virtual std::shared_ptr<KeyCharacterMap> getKeyboardLayoutOverlay(
	const InputDeviceIdentifier& identifier) = 0;

	/* Gets a user-supplied alias for a particular input device, or an empty string if none. */
	virtual std::string getDeviceAlias(const InputDeviceIdentifier& identifier) = 0;

	/* Gets the affine calibration associated with the specified device. */
	virtual TouchAffineTransformation getTouchAffineTransformation(
	const std::string& inputDeviceDescriptor, int32_t surfaceRotation) = 0;
	};

	} // namespace android

	#endif // _UI_INPUT_READER_COMMON_H