Re: White on black with whiteout

[Lukas-Fabian Moser]

Hi Simon,

Am 06.01.25 um 14:40 schrieb Simon Albrecht:
> Hi Harm, hello list,
>
> unfortunately Yoshiaki-san’s “issue report” regarding whiteout has me
> coming back to you for help, since I don’t understand the mechanisms
> of your implementation well enough to start addressing the issue myself.
>
> Are we at the limits of what can sensibly be addressed on LSR-level?
> Should I create a ticket on implementing background-color and
> print-color in base LilyPond and have whiteout recognise that
> appropriately?

I'm afraid so. Whiteout color white is hard-coded in scm/stencil.scm.
This should be re-implemented using either a global variable for the
background color or (much better) a paper variable. But I doubt whether
paper variables can be used in general stencil routines, so it's maybe
better to modify the \whiteout music and markup functions.

Maybe it would be possible to refine harm's function (which at the
moment uses stencil-with-color, which simply puts a color-selection
command in front of the stencil expression as far as I can see) so that
it walks through the page stencil expression and turns any explicit
"white" into the selected background color. That could work, but it
would mess up any construction where white is being used in a
non-background meaning (i.e. for some rehearsal mark with white-on-black
design) - which would probably be acceptable as a first approximation.

Lukas