This commit adds another way how to disable the a11y manager ACL in development.
Setting the unsafe mode might not be as straightforward as setting an
environment variable for the session, and you can control it invidually too.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4217>
HDR being enabled was controlled by toggling a property on
org.gnome.Mutter.DebugControl, which affected how the color space and
HDR metadata of the output was configured. Replace this with a higher
level MetaMonitor / MetaOutput level "color mode" enum, that is also
reflected in the monitor configuration API.
This enum is then used to derive the color space and HDR metadata at the
lower level where it matters. The ForceHDR debug control property is
still left there, as it only affects the color space and transfer
function of the view related to a monitor.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4192>
It will be used to force the color state of all monitors to be as if
they managed to turn on HDR mode. This is useful for debugging shaders
in an environment where an HDR mode capable display is not available,
such as the nested mode.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4035>
by executing `global.context.get_debug_control().exported = true`.
This makes it possible to get access to the debug service without having
to start with `--enable-debug`.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3902>
Allow compositing in a linear color space and do so either when forcing
it via the debug controls D-Bus API, or when the experimental HDR mode
is enabled.
This relies on paint nodes etc to actually transform everything into the
linear target color space, which isn't done yet, so enabling it right
now will cause a broken result. Yet, introduce this now, so that
painting can be fixed piece by piece.
Linear blending is automatically enabled on monitors where HDR is
enabled, as this makes it possible to use an linear color space when
blending content from different color spaces with different transfer
functions.
Linear blending requires extra precision, i.e. 16 bit per channel
in the intermediate buffer due how the values are distributed,
so only enable the experimental HDR mode if the Cogl context supports
half float formats.
By default, no intermadiate linear offscreen framebuffer is used.
To test, do e.g.
./tools/debug-control.py --toggle ForceLinearBlending
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3433>
The debug controller can optionally, when passing --debug-control,
enable manipulating debug state, so far enabling/disabling HDR, via
D-Bus.
It's always created, in order to have a place to store debug state and
emit signals etc when it changes, but so far, it doesn't have its own
state it tracks, it just mirrors that of the monitor manager.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3432>
