Macro rerun::external::ecolor::hex_color

macro_rules! hex_color {
    ($s:literal) => { ... };
}

Construct a crate::Color32 from a hex RGB or RGBA string literal.

Requires the “color-hex” feature.

The string is checked at compile time. If the format is invalid, compilation fails. The valid format is the one described in https://drafts.csswg.org/css-color-4/#hex-color. Only 6 (RGB) or 8 (RGBA) digits are supported, and the leading # character is optional.

Note that despite being checked at compile-time, this macro is not usable in const contexts because creating the crate::Color32 instance requires floating-point arithmetic.

See also crate::Color32::from_hex and crate::Color32::to_hex.

Examples

assert_eq!(hex_color!("#202122"), Color32::from_hex("#202122").unwrap());
assert_eq!(hex_color!("#202122"), Color32::from_rgb(0x20, 0x21, 0x22));
assert_eq!(hex_color!("#202122"), hex_color!("202122"));
assert_eq!(hex_color!("#abcdef12"), Color32::from_rgba_unmultiplied(0xab, 0xcd, 0xef, 0x12));

If the literal string has the wrong format, the code does not compile.

let _ = ecolor::hex_color!("#abc");

let _ = ecolor::hex_color!("#20212x");

The macro cannot be used in a const context.

const COLOR: ecolor::Color32 = ecolor::hex_color!("#202122");