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authorwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
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treee5c0ee7e70db84bd2bfc6062784006769e9df730 /widget/gonk/libui/VelocityTracker.h
parent28cf922aa9af4d4b8e0a3ce91dc1270a55986909 (diff)
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Remove Gonk build directories
Diffstat (limited to 'widget/gonk/libui/VelocityTracker.h')
-rw-r--r--widget/gonk/libui/VelocityTracker.h269
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diff --git a/widget/gonk/libui/VelocityTracker.h b/widget/gonk/libui/VelocityTracker.h
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-/*
- * Copyright (C) 2012 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 _ANDROIDFW_VELOCITY_TRACKER_H
-#define _ANDROIDFW_VELOCITY_TRACKER_H
-
-#include "Input.h"
-#include <utils/Timers.h>
-#include <utils/BitSet.h>
-
-namespace android {
-
-class VelocityTrackerStrategy;
-
-/*
- * Calculates the velocity of pointer movements over time.
- */
-class VelocityTracker {
-public:
- struct Position {
- float x, y;
- };
-
- struct Estimator {
- static const size_t MAX_DEGREE = 4;
-
- // Estimator time base.
- nsecs_t time;
-
- // Polynomial coefficients describing motion in X and Y.
- float xCoeff[MAX_DEGREE + 1], yCoeff[MAX_DEGREE + 1];
-
- // Polynomial degree (number of coefficients), or zero if no information is
- // available.
- uint32_t degree;
-
- // Confidence (coefficient of determination), between 0 (no fit) and 1 (perfect fit).
- float confidence;
-
- inline void clear() {
- time = 0;
- degree = 0;
- confidence = 0;
- for (size_t i = 0; i <= MAX_DEGREE; i++) {
- xCoeff[i] = 0;
- yCoeff[i] = 0;
- }
- }
- };
-
- // Creates a velocity tracker using the specified strategy.
- // If strategy is NULL, uses the default strategy for the platform.
- VelocityTracker(const char* strategy = NULL);
-
- ~VelocityTracker();
-
- // Resets the velocity tracker state.
- void clear();
-
- // Resets the velocity tracker state for specific pointers.
- // Call this method when some pointers have changed and may be reusing
- // an id that was assigned to a different pointer earlier.
- void clearPointers(BitSet32 idBits);
-
- // Adds movement information for a set of pointers.
- // The idBits bitfield specifies the pointer ids of the pointers whose positions
- // are included in the movement.
- // The positions array contains position information for each pointer in order by
- // increasing id. Its size should be equal to the number of one bits in idBits.
- void addMovement(nsecs_t eventTime, BitSet32 idBits, const Position* positions);
-
- // Adds movement information for all pointers in a MotionEvent, including historical samples.
- void addMovement(const MotionEvent* event);
-
- // Gets the velocity of the specified pointer id in position units per second.
- // Returns false and sets the velocity components to zero if there is
- // insufficient movement information for the pointer.
- bool getVelocity(uint32_t id, float* outVx, float* outVy) const;
-
- // Gets an estimator for the recent movements of the specified pointer id.
- // Returns false and clears the estimator if there is no information available
- // about the pointer.
- bool getEstimator(uint32_t id, Estimator* outEstimator) const;
-
- // Gets the active pointer id, or -1 if none.
- inline int32_t getActivePointerId() const { return mActivePointerId; }
-
- // Gets a bitset containing all pointer ids from the most recent movement.
- inline BitSet32 getCurrentPointerIdBits() const { return mCurrentPointerIdBits; }
-
-private:
- static const char* DEFAULT_STRATEGY;
-
- nsecs_t mLastEventTime;
- BitSet32 mCurrentPointerIdBits;
- int32_t mActivePointerId;
- VelocityTrackerStrategy* mStrategy;
-
- bool configureStrategy(const char* strategy);
-
- static VelocityTrackerStrategy* createStrategy(const char* strategy);
-};
-
-
-/*
- * Implements a particular velocity tracker algorithm.
- */
-class VelocityTrackerStrategy {
-protected:
- VelocityTrackerStrategy() { }
-
-public:
- virtual ~VelocityTrackerStrategy() { }
-
- virtual void clear() = 0;
- virtual void clearPointers(BitSet32 idBits) = 0;
- virtual void addMovement(nsecs_t eventTime, BitSet32 idBits,
- const VelocityTracker::Position* positions) = 0;
- virtual bool getEstimator(uint32_t id, VelocityTracker::Estimator* outEstimator) const = 0;
-};
-
-
-/*
- * Velocity tracker algorithm based on least-squares linear regression.
- */
-class LeastSquaresVelocityTrackerStrategy : public VelocityTrackerStrategy {
-public:
- enum Weighting {
- // No weights applied. All data points are equally reliable.
- WEIGHTING_NONE,
-
- // Weight by time delta. Data points clustered together are weighted less.
- WEIGHTING_DELTA,
-
- // Weight such that points within a certain horizon are weighed more than those
- // outside of that horizon.
- WEIGHTING_CENTRAL,
-
- // Weight such that points older than a certain amount are weighed less.
- WEIGHTING_RECENT,
- };
-
- // Degree must be no greater than Estimator::MAX_DEGREE.
- LeastSquaresVelocityTrackerStrategy(uint32_t degree, Weighting weighting = WEIGHTING_NONE);
- virtual ~LeastSquaresVelocityTrackerStrategy();
-
- virtual void clear();
- virtual void clearPointers(BitSet32 idBits);
- virtual void addMovement(nsecs_t eventTime, BitSet32 idBits,
- const VelocityTracker::Position* positions);
- virtual bool getEstimator(uint32_t id, VelocityTracker::Estimator* outEstimator) const;
-
-private:
- // Sample horizon.
- // We don't use too much history by default since we want to react to quick
- // changes in direction.
- static const nsecs_t HORIZON = 100 * 1000000; // 100 ms
-
- // Number of samples to keep.
- static const uint32_t HISTORY_SIZE = 20;
-
- struct Movement {
- nsecs_t eventTime;
- BitSet32 idBits;
- VelocityTracker::Position positions[MAX_POINTERS];
-
- inline const VelocityTracker::Position& getPosition(uint32_t id) const {
- return positions[idBits.getIndexOfBit(id)];
- }
- };
-
- float chooseWeight(uint32_t index) const;
-
- const uint32_t mDegree;
- const Weighting mWeighting;
- uint32_t mIndex;
- Movement mMovements[HISTORY_SIZE];
-};
-
-
-/*
- * Velocity tracker algorithm that uses an IIR filter.
- */
-class IntegratingVelocityTrackerStrategy : public VelocityTrackerStrategy {
-public:
- // Degree must be 1 or 2.
- IntegratingVelocityTrackerStrategy(uint32_t degree);
- ~IntegratingVelocityTrackerStrategy();
-
- virtual void clear();
- virtual void clearPointers(BitSet32 idBits);
- virtual void addMovement(nsecs_t eventTime, BitSet32 idBits,
- const VelocityTracker::Position* positions);
- virtual bool getEstimator(uint32_t id, VelocityTracker::Estimator* outEstimator) const;
-
-private:
- // Current state estimate for a particular pointer.
- struct State {
- nsecs_t updateTime;
- uint32_t degree;
-
- float xpos, xvel, xaccel;
- float ypos, yvel, yaccel;
- };
-
- const uint32_t mDegree;
- BitSet32 mPointerIdBits;
- State mPointerState[MAX_POINTER_ID + 1];
-
- void initState(State& state, nsecs_t eventTime, float xpos, float ypos) const;
- void updateState(State& state, nsecs_t eventTime, float xpos, float ypos) const;
- void populateEstimator(const State& state, VelocityTracker::Estimator* outEstimator) const;
-};
-
-
-/*
- * Velocity tracker strategy used prior to ICS.
- */
-class LegacyVelocityTrackerStrategy : public VelocityTrackerStrategy {
-public:
- LegacyVelocityTrackerStrategy();
- virtual ~LegacyVelocityTrackerStrategy();
-
- virtual void clear();
- virtual void clearPointers(BitSet32 idBits);
- virtual void addMovement(nsecs_t eventTime, BitSet32 idBits,
- const VelocityTracker::Position* positions);
- virtual bool getEstimator(uint32_t id, VelocityTracker::Estimator* outEstimator) const;
-
-private:
- // Oldest sample to consider when calculating the velocity.
- static const nsecs_t HORIZON = 200 * 1000000; // 100 ms
-
- // Number of samples to keep.
- static const uint32_t HISTORY_SIZE = 20;
-
- // The minimum duration between samples when estimating velocity.
- static const nsecs_t MIN_DURATION = 10 * 1000000; // 10 ms
-
- struct Movement {
- nsecs_t eventTime;
- BitSet32 idBits;
- VelocityTracker::Position positions[MAX_POINTERS];
-
- inline const VelocityTracker::Position& getPosition(uint32_t id) const {
- return positions[idBits.getIndexOfBit(id)];
- }
- };
-
- uint32_t mIndex;
- Movement mMovements[HISTORY_SIZE];
-};
-
-} // namespace android
-
-#endif // _ANDROIDFW_VELOCITY_TRACKER_H