Function rgba2hex

pub const fn rgba2hex(r: u8, g: u8, b: u8, a: u8) -> u32 

Available on crate feature dep_fltk only.

Convenience function to convert rgba to hex. Example:

use fltk::utils::rgba2hex;
let ret = rgba2hex(0, 255, 0, 255); println!("0x{:08x}", ret);