input/mouse: add accel_profile custom #8592
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Support libinput LIBINPUT_CONFIG_ACCEL_PROFILE_CUSTOM to define a custom mouse pointer acceleration curve. Implements swaywm#8488.
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Support libinput LIBINPUT_CONFIG_ACCEL_PROFILE_CUSTOM to define a custom mouse pointer acceleration curve. Implements #8488.
Custom acceleration curve is documented in libinput https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html#the-custom-acceleration-profile.
Some thoughts:
Custom acceleration is also supported for scrolling, but this commit only implements pointer motion (LIBINPUT_ACCEL_TYPE_MOTION).
We can't detect if values changed because libinput does not provide a way to read back values set by libinput_config_accel_set_points/libinput_device_config_accel_apply. Sway seems to want to know if it changed to trigger a notification (ipc_event_input).
I stuffed the "step" and "points" values into one config option. Maybe it's better to have two like libinput.conf AccelStepMotion/AccelPointsMotion.