| 1 | @charset "UTF-8"; |
| 2 | |
| 3 | /// Programatically determines the lightness of a color. |
| 4 | /// |
| 5 | /// @argument {color (hex)} $hex-color |
| 6 | /// |
| 7 | /// @return {number (0-1)} |
| 8 | /// |
| 9 | /// @example scss |
| 10 | /// _lightness($color) |
| 11 | /// |
| 12 | /// @access private |
| 13 | |
| 14 | @function _lightness($hex-color) { |
| 15 | $-local-red-raw: red(rgba($hex-color, 1)); |
| 16 | $-local-green-raw: green(rgba($hex-color, 1)); |
| 17 | $-local-blue-raw: blue(rgba($hex-color, 1)); |
| 18 | |
| 19 | $-local-red: _gamma($-local-red-raw / 255); |
| 20 | $-local-green: _gamma($-local-green-raw / 255); |
| 21 | $-local-blue: _gamma($-local-blue-raw / 255); |
| 22 | |
| 23 | @return $-local-red * 0.2126 + $-local-green * 0.7152 + $-local-blue * 0.0722; |
| 24 | } |