PrecisionThreeFingerDrag VS LibreScroll

You may be interested in how I did my Windows script for adding three-finger drag[0].

Basically, it is an independent subscriber to RawInput messages that only keeps track of whether or not to send three-finger drag, and posts emulated mouse messages using SendInput. I have a few other scripts that each run as independent userland processes that only monitors their own trigger and nothing else.

Tangentially, not sure if this might serve for some inspiration, but my TPMouse[1] script implemented inertia in a framerate-independent way so that it uses very little resource while having perfect simulation stability.

A previous discussion where I explained the analytic derivation for this low-resource exact-solution damped inertia can be seen in [10]

[0] https://github.com/EsportToys/PrecisionThreeFingerDrag/blob/...

[1] https://github.com/EsportToys/TPMouse

[10] https://old.reddit.com/r/Trackballs/comments/ym9q2t/tpmouse_...

You'll need to tick the "Other Human-Interface Devices" checkbox and untick Mouse and Keyboard, so that you don't get the driver-synthesized SendInput mouse reports flooding the outputs

[0] https://github.com/EsportToys/PrecisionThreeFingerDrag

[1] https://learn.microsoft.com/en-us/windows-hardware/drivers/hid/introduction-to-hid-concepts

[2] https://github.com/EsportToys/RawinputViewer