Google

/*
 * Add a color at the given distance
 *
 * Examples:
 *   # add the context color with a 100 pixel offset
 *   grad.add_color 100
 *
 *   # add white at a 100 pixel offset
 *   grad.add_color 100, Imlib2::Color::WHITE
 *
 */
static VALUE gradient_add_color(int argc, VALUE *argv, VALUE self) {