accessibility: implementation of zoom/invert on Wayland?
code at funwithsoftware.org
Thu Jul 1 21:11:23 UTC 2021
I'm new to Wayland and only have a fairly basic understanding of how the
different parts fit together. I'm trying to find out more about how the
following two accessibility features (for visually impaired users) are
implemented and how I might be able to contribute to them:
* Invert colors
For example, these features are described in the Ubuntu documentation here:
I'm assuming zoom and invert are implemented in the Wayland compositor?
Is there any code for this in the reference implementation (Weston) or
does each desktop environment have to implement these features from
scratch in their own compositor?
Background/motivation: I have a visually impaired friend who is
currently "trapped" on MacOS because Linux's implementation of zoom and
invert does not have feature parity with MacOS's implementation. (For
example, keyboard or keyboard+mouse shortcuts for changing the zoom
factor on the fly.) I'd like for her to be able to use Linux, so I'm
interested in finding out how I can contribute to solving the following
* Some desktop environments (such as Xfce) don't seem to support zoom
and invert at all.
* The default desktop environment for Ubuntu (see link above) implements
zoom and invert in a very clunky way. To change the zoom factor, you
have to go to the settings application. (Versus just being able to use
a modifier key and the scroll gesture to be able to zoom in and out on
MacOS.) Also, it appears that there is no way to invert without also
turning on zoom.
Is this a battle that has to be fought on a per-desktop environment
basis, or would it be possible to contribute some code to Weston that
would make a good implementation of zoom and invert available to all
Thanks for any information,
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