Constant libnotcurses_sys::NCALPHA_BG_PALETTE

pub const NCALPHA_BG_PALETTE: u32 = crate::bindings::ffi::NC_BG_PALETTE; // 0x0800_0000u32

If this bit and NCALPHA_BGDEFAULT_MASK are set, we’re using a palette-indexed background color

See the detailed diagram at NcChannels

Note: This can also be used against a single NcChannel