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/*
*
* Copyright © 2006-2009 Simon Thum simon dot thum at gmx dot de
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef POINTERVELOCITY_H
#define POINTERVELOCITY_H
#include <input.h> /* DeviceIntPtr */
/* constants for acceleration profiles */
#define AccelProfileNone -1
#define AccelProfileClassic 0
#define AccelProfileDeviceSpecific 1
#define AccelProfilePolynomial 2
#define AccelProfileSmoothLinear 3
#define AccelProfileSimple 4
#define AccelProfilePower 5
#define AccelProfileLinear 6
#define AccelProfileSmoothLimited 7
#define AccelProfileLAST AccelProfileSmoothLimited
/* fwd */
struct _DeviceVelocityRec;
/**
* profile
* returns actual acceleration depending on velocity, acceleration control,...
*/
typedef float (*PointerAccelerationProfileFunc)
(DeviceIntPtr dev, struct _DeviceVelocityRec* vel,
float velocity, float threshold, float accelCoeff);
/**
* a motion history, with just enough information to
* calc mean velocity and decide which motion was along
* a more or less straight line
*/
typedef struct _MotionTracker {
int dx, dy; /* accumulated delta for each axis */
int time; /* time of creation */
int dir; /* initial direction bitfield */
} MotionTracker, *MotionTrackerPtr;
/* number of properties for predictable acceleration */
#define NPROPS_PREDICTABLE_ACCEL 4
/**
* Contains all data needed to implement mouse ballistics
*/
typedef struct _DeviceVelocityRec {
MotionTrackerPtr tracker;
int num_tracker;
int cur_tracker; /* current index */
float velocity; /* velocity as guessed by algorithm */
float last_velocity; /* previous velocity estimate */
int last_dx; /* last time-difference */
int last_dy ; /* phase of last/current estimate */
float corr_mul; /* config: multiply this into velocity */
float const_acceleration; /* config: (recipr.) const deceleration */
float min_acceleration; /* config: minimum acceleration */
short reset_time; /* config: reset non-visible state after # ms */
short use_softening; /* config: use softening of mouse values */
float max_rel_diff; /* config: max. relative difference */
float max_diff; /* config: max. difference */
int initial_range; /* config: max. offset used as initial velocity */
Bool average_accel; /* config: average acceleration over velocity */
PointerAccelerationProfileFunc Profile;
PointerAccelerationProfileFunc deviceSpecificProfile;
void* profile_private;/* extended data, see SetAccelerationProfile() */
struct { /* to be able to query this information */
int profile_number;
} statistics;
long prop_handlers[NPROPS_PREDICTABLE_ACCEL];
} DeviceVelocityRec, *DeviceVelocityPtr;
extern _X_EXPORT void
InitVelocityData(DeviceVelocityPtr vel);
extern _X_EXPORT void
InitTrackers(DeviceVelocityPtr vel, int ntracker);
extern _X_EXPORT short
ProcessVelocityData2D(DeviceVelocityPtr vel, int dx, int dy, int time);
extern _X_EXPORT float
BasicComputeAcceleration(DeviceIntPtr dev, DeviceVelocityPtr vel,
float velocity, float threshold, float acc);
extern _X_EXPORT void
FreeVelocityData(DeviceVelocityPtr vel);
extern _X_INTERNAL BOOL
InitializePredictableAccelerationProperties(DeviceIntPtr dev);
extern _X_INTERNAL BOOL
DeletePredictableAccelerationProperties(DeviceIntPtr dev);
extern _X_EXPORT int
SetAccelerationProfile(DeviceVelocityPtr vel, int profile_num);
extern _X_EXPORT DeviceVelocityPtr
GetDevicePredictableAccelData(DeviceIntPtr dev);
extern _X_EXPORT void
SetDeviceSpecificAccelerationProfile(DeviceVelocityPtr vel,
PointerAccelerationProfileFunc profile);
extern _X_INTERNAL void
AccelerationDefaultCleanup(DeviceIntPtr dev);
extern _X_INTERNAL void
acceleratePointerPredictable(DeviceIntPtr dev, int first_valuator,
int num_valuators, int *valuators, int evtime);
extern _X_INTERNAL void
acceleratePointerLightweight(DeviceIntPtr dev, int first_valuator,
int num_valuators, int *valuators, int ignored);
#endif /* POINTERVELOCITY_H */
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