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Bug 5495 - [PATCH] Continuous scroll events are way too fast on Wayland
Summary: [PATCH] Continuous scroll events are way too fast on Wayland
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: events (show other bugs)
Version: HG 2.0
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-01-23 01:23 UTC by Cameron Gutman
Modified: 2021-01-23 17:32 UTC (History)
0 users

See Also:

Attachments
Patch (1.92 KB, patch)
2021-01-23 01:24 UTC, Cameron Gutman 		Details | Diff
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Description Cameron Gutman 2021-01-23 01:23:37 UTC 
When using GNOME Wayland on an XPS 13 9370, the trackpad scrolls way too fast. Nearly each of the high-resolution scroll events generates a SDL_MOUSEWHEEL event for a full "tick" of the scroll wheel.

Like how Windows generates scroll events which are fractional units of WHEEL_DELTA, Wayland compositors seem to have standardized on 10 units per wheel tick ratio to match with the Weston reference compositor (see link below). Since we're not handling that, scrolling is 10x too fast on Wayland.

https://chromium.googlesource.com/chromium/src/+/master/components/exo/wayland/wayland_pointer_delegate.cc#104
Comment 1 Cameron Gutman 2021-01-23 01:24:33 UTC 
Created attachment 4691 [details]
Patch
Comment 2 Sam Lantinga 2021-01-23 17:32:43 UTC 
Patch added, thanks!
https://hg.libsdl.org/SDL/rev/cff8177f36f0