Function whole_picture_vdenc 

fn whole_picture_vdenc(fd: c_int) -> bool

Whether the render node fd is an Intel part whose low-power H.264 encoder walks a picture once, top to bottom, wherever its slices are cut: Skylake and Broxton, told by the PCI device the kernel names, since their drivers list the entry point, and iHD a slice structure, as they do for the later parts that code the cut. A picture of four slices came out corrupt below the first there (HD 530), and whole from the full entry point.