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pointer: transform low-res to high-res axis events

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Currently, the "wlr_event_pointer_axis" event stores low-resolution
values in its "delta_discrete" field. Low-resolution values are always
multiples of one, i.e., 1 for one wheel detent, 2 for two wheel
detents, etc.

In order to simplify internal handling of events, always transform in
the backend from the low-resolution value into the high-resolution
value.

The transformation is performed by multiplying by 120. The 120 magic
number is used by the kernel and it is exposed to clients in the
"WLR_POINTER_AXIS_DISCRETE_STEP" constant.
This commit is contained in:
José Expósito 2022-02-25 17:30:31 +01:00
parent c84cc660f0
commit 65c436407f
4 changed files with 5 additions and 2 deletions
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2
include/wlr/types/wlr_pointer.h
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@ -78,6 +78,8 @@ enum wlr_axis_orientation {
WLR_AXIS_ORIENTATION_HORIZONTAL,
};
#define WLR_POINTER_AXIS_DISCRETE_STEP 120
struct wlr_pointer_axis_event {
struct wlr_pointer *pointer;
uint32_t time_msec;