Add CPU soft ISP multi-threading support.
Benchmark results for the Arduino Uno-Q with a weak CPU which is good for
performance testing, all numbers with an IMX219 running at
3280x2464 -> 3272x2464:
1 thread : 147ms / frame, ~6.5 fps
2 threads: 80ms / frame, ~12.5 fps
3 threads: 65ms / frame, ~15 fps
Adding a 4th thread does not improve performance.
Tested-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> # ThinkPad X1 Yoga Gen 7 + ov2740
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
e948ada380
