Support enabling the histogram statistics engine and retrieving
histogram data. Histogram data is currently ignored in the image quality
tuning implementation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

valgrind has no way to know that the kernel will fill links and pads
arrays passed to an ioctl through __user pointers. Allocate the arrays
with calloc() to make sure they get initialized. This also fixes the
potential integer overflow.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Don't try to force the sensor format or the output format at the
pipeline input when using memory-to-memory pipelines.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

When using sensor scaling the sensor was incorrectly configured to crop
the image to a lower size instead of scaling it. Cropping is applied
before scaling in the sensor, so the crop rectangle needs to be set to
the pipeline input size, not the sensor output size.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Don't suspend and resume the viewfinder implicitly when taking a
snapshot, but let the application stop the viewfinder before taking the
snapshot, and restart it afterwards.

Applications are now responsible for keeping track of the viewfinder
output buffers state and pass of bitmask of output buffers indices to be
queued when starting the viewfinder.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Make building and trying format possible on a pipeline that starts with
a video node.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>