Automattic / jetpack

	// increases opacity by amount

	protected static $lib_opacify = array("color", "amount");

	protected function lib_opacify($args) {

		$color = $this->assertColor($args[0]);

		$amount = $this->coercePercent($args[1]);

		$color[4] = (isset($color[4]) ? $color[4] : 1) + $amount;

		$color[4] = min(1, max(0, $color[4]));

		return $color;

	}

	protected static $lib_fade_in = array("color", "amount");

	protected function lib_fade_in($args) {

	// decreases opacity by amount

	protected static $lib_transparentize = array("color", "amount");

	protected function lib_transparentize($args) {

		$color = $this->assertColor($args[0]);

		$amount = $this->coercePercent($args[1]);

		$color[4] = (isset($color[4]) ? $color[4] : 1) - $amount;

		$color[4] = min(1, max(0, $color[4]));

		return $color;

	}

	protected static $lib_fade_out = array("color", "amount");

	protected function lib_fade_out($args) {