Function mupdf_sys::fz_save_pixmap_as_pnm

pub unsafe extern "C" fn fz_save_pixmap_as_pnm(
    ctx: *mut fz_context, 
    pixmap: *mut fz_pixmap, 
    filename: *const c_char
)

Save a pixmap as a pnm (greyscale or rgb, no alpha).