libcamera: controls: Extend ControlList to access controls by ID

The ControlList class implements a map from control specifier to control
ID. To avoid constant lookups of ControlInfo when using the class in the
libcamera core or in pipeline handlers, the map uses ControlInfo
pointers instead of ControlId values. This is however not very
convenient for applications or pipeline handlers, as they would be
forced to first look up the ControlInfo pointers for the controls they
want to access. Facilitate ease of use of ControlLists by implementing
an internal lookup of the ControlInfo from the controls provided by the
Camera.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/libcamera/controls.h b/include/libcamera/controls.h
index 18293c94..fbb3a622 100644
--- a/include/libcamera/controls.h
+++ b/include/libcamera/controls.h
@@ -117,11 +117,13 @@ public:
 	const_iterator begin() const { return controls_.begin(); }
 	const_iterator end() const { return controls_.end(); }
 
+	bool contains(ControlId id) const;
 	bool contains(const ControlInfo *info) const;
 	bool empty() const { return controls_.empty(); }
 	std::size_t size() const { return controls_.size(); }
 	void clear() { controls_.clear(); }
 
+	ControlValue &operator[](ControlId id);
 	ControlValue &operator[](const ControlInfo *info) { return controls_[info]; }
 
 	void update(const ControlList &list);