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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-06-30 20:48:05 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-07-02 16:59:29 +0300
commit0adc13ff7626a12b227d30313b64ffb99a977531 (patch)
treec56dcedaba9c61c66e8711bf51ff007d1aff54e2
parentb9bf9514eb7b08220763d7d72c3b1b83bdfe6ab0 (diff)
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>
-rw-r--r--include/libcamera/controls.h2
-rw-r--r--src/libcamera/controls.cpp54
2 files changed, 56 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);
diff --git a/src/libcamera/controls.cpp b/src/libcamera/controls.cpp
index cd2cf337..42a2f899 100644
--- a/src/libcamera/controls.cpp
+++ b/src/libcamera/controls.cpp
@@ -10,6 +10,8 @@
#include <sstream>
#include <string>
+#include <libcamera/camera.h>
+
#include "log.h"
#include "utils.h"
@@ -388,6 +390,30 @@ ControlList::ControlList(Camera *camera)
*/
/**
+ * \brief Check if the list contains a control with the specified \a id
+ * \param[in] id The control ID
+ *
+ * The behaviour is undefined if the control \a id is not supported by the
+ * camera that the ControlList refers to.
+ *
+ * \return True if the list contains a matching control, false otherwise
+ */
+bool ControlList::contains(ControlId id) const
+{
+ const ControlInfoMap &controls = camera_->controls();
+ const auto iter = controls.find(id);
+ if (iter == controls.end()) {
+ LOG(Controls, Error)
+ << "Camera " << camera_->name()
+ << " does not support control " << id;
+
+ return false;
+ }
+
+ return controls_.find(&iter->second) != controls_.end();
+}
+
+/**
* \brief Check if the list contains a control with the specified \a info
* \param[in] info The control info
* \return True if the list contains a matching control, false otherwise
@@ -415,6 +441,34 @@ bool ControlList::contains(const ControlInfo *info) const
*/
/**
+ * \brief Access or insert the control specified by \a id
+ * \param[in] id The control ID
+ *
+ * This method returns a reference to the control identified by \a id, inserting
+ * it in the list if the ID is not already present.
+ *
+ * The behaviour is undefined if the control \a id is not supported by the
+ * camera that the ControlList refers to.
+ *
+ * \return A reference to the value of the control identified by \a id
+ */
+ControlValue &ControlList::operator[](ControlId id)
+{
+ const ControlInfoMap &controls = camera_->controls();
+ const auto iter = controls.find(id);
+ if (iter == controls.end()) {
+ LOG(Controls, Error)
+ << "Camera " << camera_->name()
+ << " does not support control " << id;
+
+ static ControlValue empty;
+ return empty;
+ }
+
+ return controls_[&iter->second];
+}
+
+/**
* \fn ControlList::operator[](const ControlInfo *info)
* \brief Access or insert the control specified by \a info
* \param[in] info The control info