Function mupdf_sys::fz_begin_group

pub unsafe extern "C" fn fz_begin_group(
    ctx: *mut fz_context, 
    dev: *mut fz_device, 
    area: fz_rect, 
    cs: *mut fz_colorspace, 
    isolated: c_int, 
    knockout: c_int, 
    blendmode: c_int, 
    alpha: f32
)