ptrveloc.h revision a3f3701cea1ba388e7c877955252bb7375eedebd
/*
*
* Copyright © 2006-2011 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,
* 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>
/* 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
/* fwd */
struct _DeviceVelocityRec;
/**
* profile
* returns actual acceleration depending on velocity, acceleration control,...
*/
typedef double (*PointerAccelerationProfileFunc)
/**
* 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 time; /* time of creation */
int dir; /* initial direction bitfield */
/**
* Contains all data needed to implement mouse ballistics
*/
typedef struct _DeviceVelocityRec {
int num_tracker;
int cur_tracker; /* current index */
double velocity; /* velocity as guessed by algorithm */
double last_velocity; /* previous velocity estimate */
double last_dx; /* last time-difference */
double corr_mul; /* config: multiply this into velocity */
double const_acceleration; /* config: (recipr.) const deceleration */
double min_acceleration; /* config: minimum acceleration */
short reset_time; /* config: reset non-visible state after # ms */
short use_softening; /* config: use softening of mouse values */
double max_rel_diff; /* config: max. relative difference */
double max_diff; /* config: max. difference */
int initial_range; /* config: max. offset used as initial velocity */
void *profile_private; /* extended data, see SetAccelerationProfile() */
struct { /* to be able to query this information */
int profile_number;
} statistics;
/**
* contains the run-time data for the predictable scheme, that is, a
* DeviceVelocityPtr and the property handlers.
*/
typedef struct _PredictableAccelSchemeRec {
long *prop_handlers;
int num_prop_handlers;
extern _X_EXPORT void
extern _X_EXPORT void
extern _X_EXPORT double
extern _X_EXPORT void
extern _X_EXPORT int
extern _X_EXPORT DeviceVelocityPtr
extern _X_EXPORT void
extern _X_INTERNAL void
extern _X_INTERNAL Bool
struct _ValuatorAccelerationRec *protoScheme);
extern _X_INTERNAL void
extern _X_INTERNAL void
#endif /* POINTERVELOCITY_H */