libcamera: Correct struct forward declarations

Several structures are forward-declarated as classes. Fix this by using
the struct keyword where appropriate, or removing the forward
declaration when not needed.

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

3 files changed, 4 insertions, 3 deletions

diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h
index b2dafda3..777b7e4d 100644
--- a/include/libcamera/camera.h
+++ b/include/libcamera/camera.h
@@ -21,9 +21,10 @@ class Buffer;
 class PipelineHandler;
 class Request;
 class Stream;
-class StreamConfiguration;
 class StreamUsage;
 
+struct StreamConfiguration;
+
 class CameraConfiguration
 {
 public:
diff --git a/src/libcamera/include/camera_sensor.h b/src/libcamera/include/camera_sensor.h
index 7f2f906b..b8234802 100644
--- a/src/libcamera/include/camera_sensor.h
+++ b/src/libcamera/include/camera_sensor.h
@@ -18,7 +18,8 @@ namespace libcamera {
 
 class MediaEntity;
 class V4L2Subdevice;
-class V4L2SubdeviceFormat;
+
+struct V4L2SubdeviceFormat;
 
 class CameraSensor : protected Loggable
 {
diff --git a/src/libcamera/include/pipeline_handler.h b/src/libcamera/include/pipeline_handler.h
index c3f7d4c2..5830e531 100644
--- a/src/libcamera/include/pipeline_handler.h
+++ b/src/libcamera/include/pipeline_handler.h
@@ -26,7 +26,6 @@ class MediaDevice;
 class PipelineHandler;
 class Request;
 class Stream;
-class StreamConfiguration;
 class StreamUsage;
 
 class CameraData