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Kernel and Subsystems Technical Reference, Volume 2

MSCALE (Set Mouse Scale Factor)

Purpose

Sets mouse scale factor.

Syntax

#include <sys/inputdd.h>

int ioctl 
(FileDescriptor, MSCALE, Arg)
int FileDescriptor;
uint *Arg;

Description

The MSCALE ioctl subroutine call provides a course/fine tracking response. The reported horizontal and vertical movement is converted as follows:

Reported Value
     Real Value     1:1 Scale     2:1 Scale
          0           0           0
          1           1           1
          2           2           1
          3           3           3
          4           4           6
          5           5           9
          N           N        N x 2
  where N >= 6

The default scale factor is 1:1.

Parameters

FileDescriptor Specifies the open file descriptor for the mouse.
Arg Specifies the address of an integer where value is one of the following values:

#define MSCALE11 1 /* 1:1 scale */
#define MSCALE21 2 /* 2:1 scale */

Implementation Specifics

This ioctl subroutine call is part of Base Operating System (BOS) Runtime.

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