[Wayland-bugs] [Bug 96982] xf86-input-libinput: Rough and lopsided mouse movement in games/apps that reposition mouse

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96982

--- Comment #14 from Peter Hutterer <peter.hutterer at who-t.net> ---
(In reply to Danni H from comment #13)
> Hi, where would be a good place to discuss the implementation of a possible
> fix for this issue?

best is the xorg-devel list, this is core X server stuff.

> I'm not really sure why you would need to reset subpixel information when
> traveling large distances. Wouldn't one simply be able to do something like
> this:
> 
> xPos += floor(destinationX) - floor(sourceX);
> 
> This would move the cursor while preserving the fractional because it would
> only ever adjust the mouse position by some number of whole pixels.

well, that's the bit up for discussion. Because we're only dealing with
subpixel here I think we should be fine with the 0.5 offset but my gut tells me
warping a request of 0/0 to 0.9/0.9 because that's the leftover is wrong. There
are a few places where subpixels matter (iirc pointer barries for example) and
you may different behaviour depending on whether there's a remainder or not.

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