1a71862d33
Replace multi-stage filtering with simple linear velocity, tracked several instances backwards. A heuristic ensures only approximately linear motion is considered, so velocity remains valid in any case. Numerical stability is much better, and nothing changes to people who didn't tune the advanced features of the previous algorithm. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
/*
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*
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* Copyright © 2006-2008 Simon Thum simon dot thum at gmx dot de
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef POINTERVELOCITY_H
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#define POINTERVELOCITY_H
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#include <input.h> /* DeviceIntPtr */
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/* constants for acceleration profiles;
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* see */
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#define AccelProfileClassic 0
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#define AccelProfileDeviceSpecific 1
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#define AccelProfilePolynomial 2
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#define AccelProfileSmoothLinear 3
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#define AccelProfileSimple 4
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#define AccelProfilePower 5
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#define AccelProfileLinear 6
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#define AccelProfileReserved 7
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#define AccelProfileLAST AccelProfileReserved
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/* fwd */
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struct _DeviceVelocityRec;
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/**
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* profile
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* returns actual acceleration depending on velocity, acceleration control,...
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*/
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typedef float (*PointerAccelerationProfileFunc)
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(struct _DeviceVelocityRec* /*pVel*/,
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float /*velocity*/, float /*threshold*/, float /*acc*/);
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/**
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* a motion history, with just enough information to
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* calc mean velocity and decide which motion was along
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* a more or less straight line
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*/
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typedef struct _MotionTracker {
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int dx, dy; /* accumulated delta for each axis */
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int time; /* time of creation */
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int dir; /* initial direction bitfield */
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} MotionTracker, *MotionTrackerPtr;
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/**
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* Contains all data needed to implement mouse ballistics
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*/
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typedef struct _DeviceVelocityRec {
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MotionTrackerPtr tracker;
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int num_tracker;
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int cur_tracker; /* current index */
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float velocity; /* velocity as guessed by algorithm */
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float last_velocity; /* previous velocity estimate */
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int last_dx; /* last time-difference */
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int last_dy ; /* phase of last/current estimate */
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float corr_mul; /* config: multiply this into velocity */
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float const_acceleration; /* config: (recipr.) const deceleration */
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float min_acceleration; /* config: minimum acceleration */
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short reset_time; /* config: reset non-visible state after # ms */
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short use_softening; /* config: use softening of mouse values */
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float max_rel_diff; /* config: max. relative difference */
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float max_diff; /* config: max. difference */
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int initial_range; /* config: max. offset used as initial velocity */
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Bool average_accel; /* config: average acceleration over velocity */
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PointerAccelerationProfileFunc Profile;
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PointerAccelerationProfileFunc deviceSpecificProfile;
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void* profile_private;/* extended data, see SetAccelerationProfile() */
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struct { /* to be able to query this information */
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int profile_number;
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} statistics;
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} DeviceVelocityRec, *DeviceVelocityPtr;
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extern _X_EXPORT void
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InitVelocityData(DeviceVelocityPtr s);
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extern _X_EXPORT void
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InitTrackers(DeviceVelocityPtr s, int ntracker);
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extern _X_EXPORT BOOL
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InitializePredictableAccelerationProperties(DeviceIntPtr pDev);
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extern _X_EXPORT int
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SetAccelerationProfile(DeviceVelocityPtr s, int profile_num);
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extern _X_EXPORT DeviceVelocityPtr
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GetDevicePredictableAccelData(DeviceIntPtr pDev);
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extern _X_EXPORT void
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SetDeviceSpecificAccelerationProfile(DeviceVelocityPtr s,
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PointerAccelerationProfileFunc profile);
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extern _X_EXPORT void
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AccelerationDefaultCleanup(DeviceIntPtr pDev);
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extern _X_EXPORT void
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acceleratePointerPredictable(DeviceIntPtr pDev, int first_valuator,
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int num_valuators, int *valuators, int evtime);
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extern _X_EXPORT void
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acceleratePointerLightweight(DeviceIntPtr pDev, int first_valuator,
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int num_valuators, int *valuators, int ignore);
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#endif /* POINTERVELOCITY_H */
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