libcamera: software_isp: Move black level to an algorithm module

The black level determination, already present as a separate class, can
be moved to the prepared Algorithm processing structure.  It is the
first of the current software ISP algorithms that is called in the stats
processing sequence, which means it is also the first one that should be
moved to the new structure.  Stats processing starts with calling
Algorithm-based processing so the call order of the algorithms is
retained.

Movement of this algorithm is relatively straightforward because all it
does is processing stats.

The comment about getting black level from the tuning files is dropped.
The black level will be taken from CameraSensorHelper if available and
that will be implemented in one of the followup patches.

Black level is now recomputed on each stats processing.  In a future
patch, after DelayedControls are used, this will be changed to recompute
the black level only after exposure/gain changes.

The black level depends on the sensor used, the computed value can be
reused in a followup capture sessions with the same sensor.  Thus it is
sufficient to (re)set the initial value in BlackLevel::init.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

0 files changed, 0 insertions, 0 deletions