Constant libnotcurses_sys::NCALPHA_FGDEFAULT_MASK

pub const NCALPHA_FGDEFAULT_MASK: u64 = crate::bindings::ffi::NC_FGDEFAULT_MASK; // 0x4000_0000_0000_0000u64

If this bit is set, we are not using the default foreground color

See the detailed diagram at NcChannels

Note: When working with a single NcChannel use NCALPHA_BGDEFAULT_MASK;