libcamera: controls: Store reference to the InfoMap

Store a reference to the ControlInfoMap used to create a ControlList and
provide an operation to retrieve it. This will be used to implement
serialization of ControlList.

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

2 files changed, 17 insertions, 3 deletions

diff --git a/include/libcamera/controls.h b/include/libcamera/controls.h
index d692e088..b1b73367 100644
--- a/include/libcamera/controls.h
+++ b/include/libcamera/controls.h
@@ -233,12 +233,16 @@ public:
 	const ControlValue &get(unsigned int id) const;
 	void set(unsigned int id, const ControlValue &value);
 
+	const ControlInfoMap *infoMap() const { return infoMap_; }
+
 private:
 	const ControlValue *find(unsigned int id) const;
 	ControlValue *find(unsigned int id);
 
 	ControlValidator *validator_;
 	const ControlIdMap *idmap_;
+	const ControlInfoMap *infoMap_;
+
 	ControlListMap controls_;
 };
 
diff --git a/src/libcamera/controls.cpp b/src/libcamera/controls.cpp
index 9c6474ad..594fed84 100644
--- a/src/libcamera/controls.cpp
+++ b/src/libcamera/controls.cpp
@@ -597,7 +597,7 @@ void ControlInfoMap::generateIdmap()
  * be used directly by application.
  */
 ControlList::ControlList()
-	: validator_(nullptr), idmap_(nullptr)
+	: validator_(nullptr), idmap_(nullptr), infoMap_(nullptr)
 {
 }
 
@@ -611,7 +611,7 @@ ControlList::ControlList()
  * argument.
  */
 ControlList::ControlList(const ControlIdMap &idmap, ControlValidator *validator)
-	: validator_(validator), idmap_(&idmap)
+	: validator_(validator), idmap_(&idmap), infoMap_(nullptr)
 {
 }
 
@@ -621,7 +621,7 @@ ControlList::ControlList(const ControlIdMap &idmap, ControlValidator *validator)
  * \param[in] validator The validator (may be null)
  */
 ControlList::ControlList(const ControlInfoMap &info, ControlValidator *validator)
-	: validator_(validator), idmap_(&info.idmap())
+	: validator_(validator), idmap_(&info.idmap()), infoMap_(&info)
 {
 }
 
@@ -771,6 +771,16 @@ void ControlList::set(unsigned int id, const ControlValue &value)
 	*val = value;
 }
 
+/**
+ * \fn ControlList::infoMap()
+ * \brief Retrieve the ControlInfoMap used to construct the ControlList
+ *
+ * \return The ControlInfoMap used to construct the ControlList. ControlList
+ * instances constructed with ControlList() or
+ * ControlList(const ControlIdMap &idmap, ControlValidator *validator) have no
+ * associated ControlInfoMap, nullptr is returned in that case.
+ */
+
 const ControlValue *ControlList::find(unsigned int id) const
 {
 	const auto iter = controls_.find(id);