[PATCH libinput 14/14] doc: explain the gesture ambiguity for 2-slot touchpads
Peter Hutterer
peter.hutterer at who-t.net
Thu Jan 7 20:11:18 PST 2016
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 at who-t.net>
---
doc/gestures.dox | 22 ++
doc/svg/gesture-2fg-ambiguity.svg | 496 ++++++++++++++++++++++++++++++++++++++
2 files changed, 518 insertions(+)
create mode 100644 doc/svg/gesture-2fg-ambiguity.svg
diff --git a/doc/gestures.dox b/doc/gestures.dox
index 8632b8e..325c795 100644
--- a/doc/gestures.dox
+++ b/doc/gestures.dox
@@ -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.
+ at 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.
+
+ at 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.
+
*/
diff --git a/doc/svg/gesture-2fg-ambiguity.svg b/doc/svg/gesture-2fg-ambiguity.svg
new file mode 100644
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--
2.5.0
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