libcamera: transform: Add operations with Orientation

Add two operations that allows to combine Transform with Orientation.

- Transform operator/(const Orientation &o1, const Orientation &o2)
  allows to easily get back the Transform that needs to be applied to
  Orientation2 to get Orientation1

- Orientation operator*(const Orientation &o, const Transform &t)
  allows to apply a Transform to an Orientation and obtain the
  combination of the two

These two operations allow applications to use Transforms to
manipulate the Orientation inside the CameraConfiguration, if they
wish.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/transform.h

@@ -74,6 +74,9 @@ Transform transformFromRotation(int angle, bool *success = nullptr);
 Transform transformFromOrientation(const Orientation &orientation);
 Orientation transformToOrientation(const Transform &transform);
 
+Transform operator/(const Orientation &o1, const Orientation &o2);
+Orientation operator*(const Orientation &o, const Transform &t);
+
 const char *transformToString(Transform t);
 
 } /* namespace libcamera */