Gets the current value of the page's filling color.
grayFill() is valid only when the page's stroking color space is HPDF_CS_DEVICE_GRAY.
when getGrayFill() succeed, it returns the current value of the page's filling color. Otherwise it returns 0.
See Implementation
Gets the current value of the page's filling color.
grayFill() is valid only when the page's stroking color space is HPDF_CS_DEVICE_GRAY.