134 lines
4.9 KiB
C
134 lines
4.9 KiB
C
/*
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*
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* Copyright © 2006-2009 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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#define AccelProfileNone -1
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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 AccelProfileLAST AccelProfileLinear
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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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(DeviceIntPtr dev, struct _DeviceVelocityRec* vel,
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float velocity, float threshold, float accelCoeff);
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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 vel);
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extern _X_EXPORT void
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InitTrackers(DeviceVelocityPtr vel, int ntracker);
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extern _X_EXPORT short
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ProcessVelocityData2D(DeviceVelocityPtr vel, int dx, int dy, int time);
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extern _X_EXPORT float
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BasicComputeAcceleration(DeviceIntPtr dev, DeviceVelocityPtr vel,
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float velocity, float threshold, float acc);
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extern _X_EXPORT void
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FreeVelocityData(DeviceVelocityPtr vel);
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extern _X_INTERNAL BOOL
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InitializePredictableAccelerationProperties(DeviceIntPtr dev);
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extern _X_EXPORT int
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SetAccelerationProfile(DeviceVelocityPtr vel, int profile_num);
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extern _X_EXPORT DeviceVelocityPtr
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GetDevicePredictableAccelData(DeviceIntPtr dev);
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extern _X_EXPORT void
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SetDeviceSpecificAccelerationProfile(DeviceVelocityPtr vel,
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PointerAccelerationProfileFunc profile);
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extern _X_INTERNAL void
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AccelerationDefaultCleanup(DeviceIntPtr dev);
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extern _X_INTERNAL void
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acceleratePointerPredictable(DeviceIntPtr dev, int first_valuator,
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int num_valuators, int *valuators, int evtime);
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extern _X_INTERNAL void
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acceleratePointerLightweight(DeviceIntPtr dev, int first_valuator,
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int num_valuators, int *valuators, int ignored);
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#endif /* POINTERVELOCITY_H */
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