Diffstat (limited to 'doc/pointer-acceleration.dox')
1 files changed, 17 insertions, 0 deletions
diff --git a/doc/pointer-acceleration.dox b/doc/pointer-acceleration.dox
index a372e154..7ec5e74d 100644
@@ -9,6 +9,16 @@ This page explains the high-level concepts used in the code. It aims to
provide an overview for developers and is not necessarily useful for
+@section ptraccel-profiles Pointer acceleration profiles
+The profile decides the general method of pointer acceleration.
+libinput currently supports two profiles: "adaptive" and "flat". The aptive
+profile is the default profile for all devices and takes the current speed
+of the device into account when deciding on acceleration. The flat profile
+is simply a constant factor applied to all device deltas, regardless of the
+speed of motion (see @ref ptraccel-profile-flat). Most of this document
+describes the adaptive pointer acceleration.
@section ptraccel-velocity Velocity calculation
The device's speed of movement is measured across multiple input events
@@ -107,4 +117,11 @@ The image above shows the trackpoint acceleration profile in comparison to the
@ref ptraccel-linear. The constant acceleration factor, usually applied by
udev, shapes the acceleration profile.
+@section ptraccel-profile-flat The flat pointer acceleration profile
+In a flat profile, the acceleration factor is constant regardless of the
+velocity of the pointer and each delta (dx, dy) results in an accelerated delta
+(dx * factor, dy * factor). This provides 1:1 movement between the device
+and the pointer on-screen.