assets/sass/bourbon/bourbon/utilities/_gamma.scss

   1 @charset "UTF-8";
   2
   3 /// Performs gamma correction on a single color channel.
   4 ///
   5 /// Note that the calculation is approximate if a `pow()` is not available.
   6 ///
   7 /// @argument {number (0-1)} $channel
   8 ///
   9 /// @return {number (0-1)}
  10 ///
  11 /// @access private
  12
  13 @function _gamma($channel) {
  14   @if $channel < 0.03928 {
  15     @return $channel / 12.92;
  16   } @else {
  17     $c: ($channel + 0.055) / 1.055;
  18     @if function-exists("pow") {
  19       @return pow($c, 2.4);
  20     } @else {
  21       @return 0.56 * $c * $c * $c + 0.44 * $c * $c;
  22     }
  23   }
  24 }