90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
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/*
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* 2006-2008 by Simon Thum
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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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#define MAX_VELOCITY_FILTERS 8
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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 /*threshold*/, float /*acc*/);
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/**
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* a filter stage contains the data for the adaptive IIR filtering.
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* To improve results, one may run several parallel filters
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* which have different decays. Since more integration means more
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* delay, a given filter only does good matches in a specific phase of
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* a stroke.
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*
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* Basically, the coupling feature makes one filter fairly enough,
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* so that is the default.
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*/
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typedef struct _FilterStage {
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float* fading_lut; /* lookup for adaptive IIR filter */
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int fading_lut_size; /* size of lookup table */
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float rdecay; /* reciprocal weighting halflife in ms */
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float current;
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} FilterStage, *FilterStagePtr;
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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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FilterStage filters[MAX_VELOCITY_FILTERS];
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float velocity; /* velocity as guessed by algorithm */
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int lrm_time; /* time the last motion event was processed */
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int last_dx, last_dy; /* last motion delta */
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int last_diff; /* last time-diff */
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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 coupling; /* config: max. divergence before coupling */
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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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int filter_usecount[MAX_VELOCITY_FILTERS];
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} statistics;
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} DeviceVelocityRec, *DeviceVelocityPtr;
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extern void
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InitVelocityData(DeviceVelocityPtr s);
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extern void
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InitFilterChain(DeviceVelocityPtr s, float rdecay, float degression,
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int lutsize, int stages);
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extern int
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SetAccelerationProfile(DeviceVelocityPtr s, int profile_num);
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extern void
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SetDeviceSpecificAccelerationProfile(DeviceIntPtr s,
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PointerAccelerationProfileFunc profile);
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extern void
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AccelerationDefaultCleanup(DeviceIntPtr pDev);
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extern 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 void
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acceleratePointerClassic(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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