[Wayland-bugs] [Bug 95074] libinput incorrectly normalizes tablet distance values

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95074

            Bug ID: 95074
           Summary: libinput incorrectly normalizes tablet distance values
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: killertofu at gmail.com

Commit 25a9f39 ("tablet: fix the airbrush slider range") has caused libinput to
start normalizing distance values to the range [-1, 1] instead of the expected
[0, 1]. This can be easily seen by bringing a tool into prox while running
libinput-debug-events:

event16    TABLET_TOOL_PROXIMITY  +2.85s        91.11*/91.11*    distance:
0.30*    rotation: 0.00*    wheel: 15.00* (1)    mouse (0xa00, id 0x17)
proximity-in    axes:drw    btn:LMRSdEx
event16    TABLET_TOOL_AXIS  +2.87s        91.21*/91.21*    distance: 0.30   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.87s        91.28*/91.28*    distance: 0.30   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.88s        91.34*/91.34*    distance: 0.21*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.89s        91.34/91.34*    distance: 0.21   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.90s        91.46*/91.46*    distance: 0.21   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.91s        91.46/91.46*    distance: 0.11*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.92s        91.58*/91.58*    distance: 0.11   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.93s        91.64*/91.64*    distance: 0.02*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.94s        91.75*/91.75*    distance: 0.02   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.95s        91.83*/91.83*    distance: 0.02   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.96s        91.92*/91.92*    distance: -0.08*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.97s        91.92/91.92*    distance: -0.08   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.98s        91.92/91.92*    distance: -0.17*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +2.99s        91.84*/91.84*    distance: -0.17   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.00s        91.74*/91.74*    distance: -0.17   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.01s        91.60*/91.60*    distance: -0.30*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.03s        91.57*/91.57    distance: -0.30   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.04s        91.57/91.57*    distance: -0.30   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.05s        91.57/91.57    distance: -0.40*   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.06s        91.57/91.57*    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.07s        91.62*/91.62    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.11s        91.66*/91.66    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.15s        91.74*/91.74    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.15s        91.74/91.74*    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.17s        91.74/91.74*    distance: -0.40   
rotation: 0.00    wheel: 0.00 (0)
event16    TABLET_TOOL_AXIS  +3.19s        91.85*/91.85    distance: -0.49*   
rotation: 0.00    wheel: 0.00 (0)

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