public HaruCMYKColor getCMYKFill()
Gets the current value of the page's filling color.
getCMYKFill() is valid only when the page's filling color space is HPDFCSDEVICE_CMYK.
Returns
when getCMYKFill() succeed, it returns the current value of the page's filling color. Otherwise it returns {0, 0, 0, 0}.