[libcamera-devel] [PATCH v4 4/4] libcamera: V4L2Device: Use Span in updateControls()

[Hirokazu Honda]

V4L2Device::updateControls() takes two arguments, raw array and
its size, for the v4l2_ext_control values. This replaces it with
libcamera::Span.

Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 include/libcamera/internal/v4l2_device.h |  4 ++--
 src/libcamera/v4l2_device.cpp            | 11 ++++-------
 2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h
index d006bf68..087f07e7 100644
--- a/include/libcamera/internal/v4l2_device.h
+++ b/include/libcamera/internal/v4l2_device.h
@@ -14,6 +14,7 @@
 #include <linux/videodev2.h>
 
 #include <libcamera/signal.h>
+#include <libcamera/span.h>
 
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/v4l2_controls.h"
@@ -55,8 +56,7 @@ protected:
 private:
 	void listControls();
 	void updateControls(ControlList *ctrls,
-			    const struct v4l2_ext_control *v4l2Ctrls,
-			    unsigned int count);
+			    Span<const v4l2_ext_control> v4l2Ctrls);
 
 	void eventAvailable(EventNotifier *notifier);
 
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 9f71bf0e..58516609 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -244,7 +244,7 @@ ControlList V4L2Device::getControls(const std::vector<uint32_t> &ids)
 		v4l2Ctrls.resize(errorIdx);
 	}
 
-	updateControls(&ctrls, v4l2Ctrls.data(), v4l2Ctrls.size());
+	updateControls(&ctrls, v4l2Ctrls);
 
 	return ctrls;
 }
@@ -343,7 +343,7 @@ int V4L2Device::setControls(ControlList *ctrls)
 		ret = errorIdx;
 	}
 
-	updateControls(ctrls, v4l2Ctrls.data(), v4l2Ctrls.size());
+	updateControls(ctrls, v4l2Ctrls);
 
 	return ret;
 }
@@ -507,14 +507,11 @@ void V4L2Device::listControls()
  * values in \a v4l2Ctrls
  * \param[inout] ctrls List of V4L2 controls to update
  * \param[in] v4l2Ctrls List of V4L2 extended controls as returned by the driver
- * \param[in] count The number of controls to update
  */
 void V4L2Device::updateControls(ControlList *ctrls,
-				const struct v4l2_ext_control *v4l2Ctrls,
-				unsigned int count)
+				Span<const v4l2_ext_control> v4l2Ctrls)
 {
-	for (unsigned int i = 0; i < count; i++) {
-		const struct v4l2_ext_control &v4l2Ctrl = v4l2Ctrls[i];
+	for (const v4l2_ext_control &v4l2Ctrl : v4l2Ctrls) {
 		const unsigned int id = v4l2Ctrl.id;
 		if (!ctrls->contains(id)) {
 			LOG(V4L2, Error) << "ControlList doesn't contain id: "
-- 
2.31.1.368.gbe11c130af-goog