IABSD.fr/xenocara/xserver/include/ptrveloc.h

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• Author : matthieu
  Date : 2012-06-10 13:21:05
  Hash : e60da745
  Message : Update to xserver 1.12.2. tested by naddy@, krw@, mpi@.

• xserver/include/ptrveloc.h

• /*
   *
   * 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,
   * 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>
  
  /* 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 double (*PointerAccelerationProfileFunc)
   (DeviceIntPtr dev, struct _DeviceVelocityRec * vel,
    double velocity, double threshold, double 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 {
      double dx, dy;              /* accumulated delta for each axis */
      int time;                   /* time of creation */
      int dir;                    /* initial direction bitfield */
  } MotionTracker, *MotionTrackerPtr;
  
  /**
   * Contains all data needed to implement mouse ballistics
   */
  typedef struct _DeviceVelocityRec {
      MotionTrackerPtr tracker;
      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 last_dy;             /* phase of last/current estimate */
      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 */
      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;
  } DeviceVelocityRec, *DeviceVelocityPtr;
  
  /**
   * contains the run-time data for the predictable scheme, that is, a
   * DeviceVelocityPtr and the property handlers.
   */
  typedef struct _PredictableAccelSchemeRec {
      DeviceVelocityPtr vel;
      long *prop_handlers;
      int num_prop_handlers;
  } PredictableAccelSchemeRec, *PredictableAccelSchemePtr;
  
  extern _X_EXPORT void
   InitVelocityData(DeviceVelocityPtr vel);
  
  extern _X_EXPORT void
   InitTrackers(DeviceVelocityPtr vel, int ntracker);
  
  extern _X_EXPORT BOOL
  ProcessVelocityData2D(DeviceVelocityPtr vel, double dx, double dy, int time);
  
  extern _X_EXPORT double
  
  BasicComputeAcceleration(DeviceIntPtr dev, DeviceVelocityPtr vel,
                           double velocity, double threshold, double acc);
  
  extern _X_EXPORT void
   FreeVelocityData(DeviceVelocityPtr vel);
  
  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 Bool
  
  InitPredictableAccelerationScheme(DeviceIntPtr dev,
                                    struct _ValuatorAccelerationRec *protoScheme);
  
  extern _X_INTERNAL void
  
  acceleratePointerPredictable(DeviceIntPtr dev, ValuatorMask *val,
                               CARD32 evtime);
  
  extern _X_INTERNAL void
  
  acceleratePointerLightweight(DeviceIntPtr dev, ValuatorMask *val,
                               CARD32 evtime);
  
  #endif                          /* POINTERVELOCITY_H */