[BRLTTY] Clickable links, virtual consoles etc. (Was Re: Footsteps towards better accessibility in Linux)

[Samuel Thibault]

Hello,

Sébastien Hinderer, le ven. 09 mai 2025 19:16:23 +0200, a ecrit:
> Dave Mielke (2025/05/09 12:48 -0400):
> I am a bit surprised that the vcsa interface was not designed to
> represent screens that actually can be displayed, but I guess it's jsut
> that the two date from different times.
> 
> If we wanted to change the vcsa, I assume that would create backward
> compatibility issues and it would thus be better to introduce a new
> interface?

linux/drivers/tty/vt/vc_screen.c says:

 * /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63)
 *            [minor: N]
 *
 * /dev/vcsaN: idem, but including attributes, and prefixed with
 *      the 4 bytes lines,columns,x,y (as screendump used to give).
 *      Attribute/character pair is in native endianity.
 *            [minor: N+128]
 *
 * /dev/vcsuN: similar to /dev/vcsaN but using 4-byte unicode values
 *      instead of 1-byte screen glyph values.
 *            [minor: N+64]
 *
 * /dev/vcsuaN: same idea as /dev/vcsaN for unicode (not yet implemented).

So it's probably just a matter of adding vcsuaN support (with 16b or
even 32b numbers.

(apparently the comment saying vcsu is like vcsa is just wrong: vcsu
doesn't have the heading attributes)

Samuel