Resolve an EKIO brand surface name to a hex code. ekio_surface() takes the
same vocabulary as theme_ekio(background = ): "offwhite" (#FBFBF6),
"white" (#FFFFFF) and "cold" (#F6F7F8). A hex code such as
"#F0EAD6" is passed through unchanged, and "transparent" returns
NA_character_ so ggplot2::element_rect() draws nothing.
Arguments
- surface
Character. A brand surface name or a hex code.
- arg, call
The argument name and the calling environment used to build error messages. See
rlang::args_error_context().
