apps: lc-compliance: Optimize std::shared_ptr usage

Avoid unnecessary copies and try to move construct `std::shared_ptr`
whenever possible.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/apps/lc-compliance/helpers/capture.cpp

@@ -12,8 +12,8 @@
 using namespace libcamera;
 
 Capture::Capture(std::shared_ptr<Camera> camera)
-	: loop_(nullptr), camera_(camera),
-	  allocator_(std::make_unique<FrameBufferAllocator>(camera))
+	: loop_(nullptr), camera_(std::move(camera)),
+	  allocator_(std::make_unique<FrameBufferAllocator>(camera_))
 {
 }
 
@@ -72,7 +72,7 @@ void Capture::stop()
 /* CaptureBalanced */
 
 CaptureBalanced::CaptureBalanced(std::shared_ptr<Camera> camera)
-	: Capture(camera)
+	: Capture(std::move(camera))
 {
 }
 
@@ -144,7 +144,7 @@ void CaptureBalanced::requestComplete(Request *request)
 /* CaptureUnbalanced */
 
 CaptureUnbalanced::CaptureUnbalanced(std::shared_ptr<Camera> camera)
-	: Capture(camera)
+	: Capture(std::move(camera))
 {
 }
 

src/apps/lc-compliance/main.cpp

@@ -50,8 +50,6 @@ static void listCameras(CameraManager *cm)
 
 static int initCamera(CameraManager *cm, OptionsParser::Options options)
 {
-	std::shared_ptr<Camera> camera;
-
 	int ret = cm->start();
 	if (ret) {
 		std::cout << "Failed to start camera manager: "
@@ -66,7 +64,7 @@ static int initCamera(CameraManager *cm, OptionsParser::Options options)
 	}
 
 	const std::string &cameraId = options[OptCamera];
-	camera = cm->get(cameraId);
+	std::shared_ptr<Camera> camera = cm->get(cameraId);
 	if (!camera) {
 		std::cout << "Camera " << cameraId << " not found, available cameras:" << std::endl;
 		listCameras(cm);