libcamera: Use the Size class through libcamera

Several of our structures include width and height fields that model a
size while we have a Size class for that purpose. Use the Size class
through libcamera, and give it a toString() method like other geometry
and format classes.

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

include/libcamera/geometry.h

@@ -40,6 +40,8 @@ struct Size {
 
 	unsigned int width;
 	unsigned int height;
+
+	const std::string toString() const;
 };
 
 bool operator==(const Size &lhs, const Size &rhs);

include/libcamera/stream.h

@@ -17,9 +17,8 @@ namespace libcamera {
 class Camera;
 
 struct StreamConfiguration {
-	unsigned int width;
-	unsigned int height;
 	unsigned int pixelFormat;
+	Size size;
 
 	unsigned int bufferCount;
 
@@ -40,7 +39,7 @@ public:
 
 protected:
 	explicit StreamUsage(Role role);
-	StreamUsage(Role role, int width, int height);
+	StreamUsage(Role role, const Size &size);
 
 private:
 	Role role_;