Re: [orca-list] Video interceptor

[Jason White <jason jasonjgw net>]

Christopher Chaltain <chaltain gmail com> wrote:
> Hopefully, the days of needing video interception is behind
> us.

I'm assuming that by "video interception" you mean the creation of a so-called
off-screen model by an assistive technology, through monitoring calls to video
drivers. The only operating systems I'm aware of in which off-screen models
have been used are OS/2, Microsoft Windows and MacOS 9 (with OutSpoken for
Macintosh).

Assistive technologies for Linux, Mac OS x, Android, etc., do not use
off-screen models. In fact, the tendency under Linux is for user interface
libraries to implement video rendering and font handling, so the driver never
has access to font information, for example. This is even more the case with
new technologies such as Wayland.

Thus, in the Linux world, I think off-screen models are out of the question
for practical purposes, and accessibility APIs give much better results
anyway.