Touch input behavior on overlapping ivi surfaces

Pekka Paalanen ppaalanen at
Tue May 24 13:14:04 UTC 2016

On Tue, 24 May 2016 18:29:52 +0530
Vikas Patil <vikasmpatil at> wrote:

> Dear All,
> Here (attached here the image ) the touch input is not going to surface 1
> even after touching any of the two buttons on surface 1.  Instead touch
> event goes to surface 2. Also if I touch anywhere in the area marked green
> also goes to surface 2 even it being the part of surface 1. Touching on the
> rest of the light blue area delivers touch correctly to surface 1.
> Both the surfaces are on one layer only (e.g. layer id 1000)
> Any one here faced such issue? What could be going wrong here? Any
> suggestions/ideas?
> Also try the limiting the input acceptance area using wayland region. But
> it didn't work.
>             input_region = wl_compositor_create_region(wlCompositor);
>             wl_region_add(input_region, 728, 5, 72, 144);
>             wl_surface_set_input_region(surface, input_region);

Mind, you need a wl_surface_commit() before that applies. And then,
maybe something else overwrites it immediately after your hack, sending
another set_input_region request.

> I am on weston 1.8, wayland-ivi-extension 1.4.0 and qt/qtwayland 5.5.1.

I really have no idea, but I am quite sure it is a surface configuration
issue outside of weston core.

You could look at the Wayland protocol dump of the client to see how it
sets the surfaces up. Input region should be clipped to the surface
area in weston core, but maybe the surface has transparent areas and a
misplaced input region?

Does that setup even let Weston core handle input focus, or is all that
hijacked to LayerManager or something?

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