libcamera: raspberrypi: Plumb user transform through to IPA

This commit plumbs the user transform from the Raspberry Pi pipeline
handler through to the IPA. Note that the transform is actually
handled in the sensor (by setting the h/v flip bits), so the IPAs need
to understand the orientation of the image they receive.

Once in the IPA we add it to the CameraMode description, so that it
becomes automatically available to all the individual control
algorithms.

The IPA configure method has to be reordered just a little so as to
fill in the transform in the camera mode before calling SwitchMode.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/raspberrypi/controller/camera_mode.h

@@ -6,6 +6,8 @@
  */
 #pragma once
 
+#include <libcamera/transform.h>
+
 // Description of a "camera mode", holding enough information for control
 // algorithms to adapt their behaviour to the different modes of the camera,
 // including binning, scaling, cropping etc.
@@ -33,6 +35,8 @@ struct CameraMode {
 	double noise_factor;
 	// line time in nanoseconds
 	double line_length;
+	// any camera transform *not* reflected already in the camera tuning
+	libcamera::Transform transform;
 };
 
 #ifdef __cplusplus