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doc: explain the gesture ambiguity for 2-slot touchpads

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Not much we can do about this until we get SMBus/RMI4 in the kernel or better
touchpads in general but this way we can at least point to some official
explanation.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2016-01-08 13:28:21 +10:00
parent 83f3dbd180
commit cab2c1640d
2 changed files with 518 additions and 0 deletions
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22
doc/gestures.dox
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@ -104,4 +104,26 @@ software button area. libinput ignores fingers within the software button
areas, the movement of the remaining fingers is thus interpreted as a
two-finger scroll motion.
@section gestures_twofinger_touchpads Gestures on two-finger touchpads
As of kernel 4.2, many @ref touchpads_touch_partial_mt provide only two
slots. This affects how gestures can be interpreted. Touchpads with only two
slots can identify two touches by position but can usually tell that there
is a third (or fourth) finger down on the touchpad - without providing
positional information for that finger.
Touchpoints are assigned in sequential order and only the first two touch
points are trackable. For libinput this produces an ambiguity where it is
impossible to detect whether a gesture is a pinch gesture or a swipe gesture
whenever a user puts the index and middle finger down first. Since the third
finger does not have positional information, it's location cannot be
determined.
@image html gesture-2fg-ambiguity.svg "Ambiguity of three-finger gestures on two-finger touchpads"
The image above illustrates this ambiguity. The index and middle finger are
set down first, the data stream from both finger positions looks identical.
In this case, libinput assumes the fingers are in a horizontal arrangement
(the right image above) and use a swipe gesture.
*/

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doc/svg/gesture-2fg-ambiguity.svg Normal file
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