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/*
*
* Copyright © 2006-2008 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 */
/* maximum number of filters to approximate velocity.
* ABI-breaker!
*/
#define MAX_VELOCITY_FILTERS 8
/* constants for acceleration profiles;
* see */
#define AccelProfileClassic 0
#define AccelProfileDeviceSpecific 1
#define AccelProfilePolynomial 2
#define AccelProfileSmoothLinear 3
#define AccelProfileSimple 4
#define AccelProfilePower 5
#define AccelProfileLinear 6
#define AccelProfileReserved 7
/* fwd */
struct _DeviceVelocityRec;
/**
* profile
* returns actual acceleration depending on velocity, acceleration control,...
*/
typedef float (*PointerAccelerationProfileFunc)
(struct _DeviceVelocityRec* /*pVel*/,
float /*velocity*/, float /*threshold*/, float /*acc*/);
/**
* a filter stage contains the data for adaptive IIR filtering.
* To improve results, one may run several parallel filters
* which have different decays. Since more integration means more
* delay, a given filter only does good matches in a specific phase of
* a stroke.
*
* Basically, the coupling feature makes one filter fairly enough,
* so that is the default.
*/
typedef struct _FilterStage {
float* fading_lut; /* lookup for adaptive IIR filter */
int fading_lut_size; /* size of lookup table */
float rdecay; /* reciprocal weighting halflife in ms */
float current;
} FilterStage, *FilterStagePtr;
/**
* Contains all data needed to implement mouse ballistics
*/
typedef struct _DeviceVelocityRec {
FilterStage filters[MAX_VELOCITY_FILTERS];
float velocity; /* velocity as guessed by algorithm */
float last_velocity; /* previous velocity estimate */
int lrm_time; /* time the last motion event was processed */
int last_dx, last_dy; /* last motion delta */
int last_diff; /* last time-difference */
Bool last_reset; /* whether a nv-reset occurred just before */
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 coupling; /* config: max. divergence before coupling */
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;
int filter_usecount[MAX_VELOCITY_FILTERS +1];
} statistics;
} DeviceVelocityRec, *DeviceVelocityPtr;
extern void
InitVelocityData(DeviceVelocityPtr s);
extern void
InitFilterChain(DeviceVelocityPtr s, float rdecay, float degression,
int lutsize, int stages);
extern int
SetAccelerationProfile(DeviceVelocityPtr s, int profile_num);
extern DeviceVelocityPtr
GetDevicePredictableAccelData(DeviceIntPtr pDev);
extern void
SetDeviceSpecificAccelerationProfile(DeviceVelocityPtr s,
PointerAccelerationProfileFunc profile);
extern void
AccelerationDefaultCleanup(DeviceIntPtr pDev);
extern void
acceleratePointerPredictable(DeviceIntPtr pDev, int first_valuator,
int num_valuators, int *valuators, int evtime);
extern void
acceleratePointerLightweight(DeviceIntPtr pDev, int first_valuator,
int num_valuators, int *valuators, int ignore);
#endif /* POINTERVELOCITY_H */
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