Trying to implement custom mouse acceleration

[Alicja]

Hello,

I'm trying to implement a custom mouse acceleration in KWin. It's really 
important for me, because I have problems with my wrist and good custom 
configuration reduces my wrist's pain. At this moment, I'm using X11 
session which allows me to setup custom mouse acceleration in terminal 
via xinput commands. However, I would like to switch to Wayland. I found 
out that such features are implemented in the KWin code.

I downloaded and built the plasma-workspace code with kde-builder. I 
wrote Q_PROPERTIES, config data and methods to handle custom 
acceleration profile.

Here is a function I wrote that is supposed to change the step of the 
custom acceleration profile:

void Device::setPointerCustomAccelerationStep(qreal step)
{
     if (step <= 0) {
         return;
     }
     auto libinputAccelConfig = 
libinput_config_accel_create(LIBINPUT_CONFIG_ACCEL_PROFILE_CUSTOM);
     if (libinput_config_accel_set_points(libinputAccelConfig, 
LIBINPUT_ACCEL_TYPE_MOTION, step, 
m_pointerCustomAccelerationPoints.size(), 
m_pointerCustomAccelerationPoints.data()) == 
LIBINPUT_CONFIG_STATUS_SUCCESS) {
         if (libinput_device_config_accel_apply(m_device, 
libinputAccelConfig) == LIBINPUT_CONFIG_STATUS_SUCCESS) {
             m_pointerCustomAccelerationStep = step;
         }
     }
     libinput_config_accel_destroy(libinputAccelConfig);
}

However, when I'm trying to build KWin with my modifications, I get 
errors about undefined references to all of the libinput functions 
needed to tweak custom acceleration. Those are: 
libinput_config_accel_create, libinput_config_accel_destroy, 
libinput_config_accel_set_points, libinput_device_config_accel_apply. 
 From what I understand, it means that those functions have not been 
implemented.

Where could I find the implementation of all libinput things? I could 
then write an implementation for those I need. I tried to search of 
already used libinput functions like 
'libinput_device_config_accel_set_speed' but I only found implemention 
for them in mock_libinput.cpp in autotests.

Regards,
ArisuwuMei