Commits on Jun 7, 2023

1. Use unsigned integer for kinetic speed …

   The current kinetic mouse key function uses resource intensive
   floating point to compute the quadratic curve speed. But the
   result is returned as an unsigned 8-bit integer value. The code
   line where fractional accuracy is important is at the division of
   `speed = (uint8_t)(speed / (1000.0f / mk_interval));`
   
   This change uses 16-bit integers for the quadratic calculation
   variables, which are less resource-intensive. The output acceleration
   curve is almost unchanged with the default `MOUSEKEY_INTERVAL` value.
   
   Truncation is used to round division output to an integer. With
   higher `MOUSEKEY_INTERVAL` values, rounding appears more accurate
   using 16-bit integer versus floating point. Example:
   
   `mk_interval = 30`
   
   | speed | (uint8_t)(speed / (1000.0f / mk_interval)) | (uint8_t)(speed / (1000U / mk_interval)) |
   |------|----|----|
   |  292 |  8 |  9 |
   |  484 | 14 | 15 |
   | 1060 | 31 | 32 |
   | 1660 | 49 | 50 |

   

   filterpaper committed Jun 7, 2023
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