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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "PointerControllerInterface.h"
#include <input/Input.h>
#include <input/InputDevice.h>
#include <input/DisplayViewport.h>
#include <input/VelocityControl.h>
#include <input/VelocityTracker.h>
#include <utils/KeyedVector.h>
#include <utils/Thread.h>
#include <utils/RefBase.h>
#include <utils/SortedVector.h>
#include <optional>
#include <stddef.h>
#include <unistd.h>
#include <unordered_map>
#include <vector>
// Maximum supported size of a vibration pattern.
// Must be at least 2.
// Maximum allowable delay value in a vibration pattern before
// which the delay will be truncated.
#define MAX_VIBRATE_PATTERN_DELAY_NSECS (1000000 * 1000000000LL)
namespace android {
/* Processes raw input events and sends cooked event data to an input listener. */
class InputReaderInterface : public virtual RefBase {
InputReaderInterface() { }
virtual ~InputReaderInterface() { }
/* 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 heatbeat 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;
/* 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 information about all input devices.
* This method may be called on any thread (usually by the input manager).
virtual void getInputDevices(std::vector<InputDeviceInfo>& outInputDevices) = 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 nsecs_t* pattern, size_t patternSize,
ssize_t repeat, int32_t token) = 0;
virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;
/* Return true if the device can send input events to the specified display. */
virtual bool canDispatchToDisplay(int32_t deviceId, int32_t displayId) = 0;
/* Reads raw events from the event hub and processes them, endlessly. */
class InputReaderThread : public Thread {
explicit InputReaderThread(const sp<InputReaderInterface>& reader);
virtual ~InputReaderThread();
sp<InputReaderInterface> mReader;
virtual bool threadLoop();
* 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.
// The pointer gesture control changed.
// The display size or orientation changed.
// The visible touches option changed.
// The keyboard layouts must be reloaded.
// The device name alias supplied by the may have changed for some devices.
// The location calibration matrix changed.
// The presence of an external stylus has changed.
// The pointer capture mode has changed.
// The set of disabled input devices (disabledDevices) has changed.
// All devices must be reopened.
// 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;
// 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;
// True if pointer capture is enabled.
bool pointerCapture;
// The set of currently disabled input devices.
SortedVector<int32_t> disabledDevices;
InputReaderConfiguration() :
pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
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
showTouches(false), pointerCapture(false) { }
std::optional<DisplayViewport> getDisplayViewportByType(ViewportType type) const;
std::optional<DisplayViewport> getDisplayViewportByUniqueId(const std::string& uniqueDisplayId)
std::optional<DisplayViewport> getDisplayViewportByPort(uint8_t physicalPort) const;
void setDisplayViewports(const std::vector<DisplayViewport>& viewports);
void dump(std::string& dump) const;
void dumpViewport(std::string& dump, const DisplayViewport& viewport) const;
std::vector<DisplayViewport> mDisplays;
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;
* 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 must NOT re-enter the input reader since they may be called while
* holding the input reader lock.
class InputReaderPolicyInterface : public virtual RefBase {
InputReaderPolicyInterface() { }
virtual ~InputReaderPolicyInterface() { }
/* 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 sp<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 sp<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