libcamera: controls: Add ControlTypePoint

Add a control_type<> specialization for libcamera::Point to allow
storing data of that type in a ControlValue instance.

The new control type will be used by controls introduced in the
next patches.

Signed-off-by: Yudhistira Erlandinata <yerlandinata@chromium.org>
Co-developed-by: Becker Hsieh <beckerh@chromium.org>
Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Author: Yudhistira Erlandinata

include/libcamera/controls.h

@@ -35,6 +35,7 @@ enum ControlType {
 	ControlTypeString,
 	ControlTypeRectangle,
 	ControlTypeSize,
+	ControlTypePoint,
 };
 
 namespace details {
@@ -97,6 +98,11 @@ struct control_type<Size> {
 	static constexpr std::size_t size = 0;
 };
 
+template<>
+struct control_type<Point> {
+	static constexpr ControlType value = ControlTypePoint;
+};
+
 template<typename T, std::size_t N>
 struct control_type<Span<T, N>> : public control_type<std::remove_cv_t<T>> {
 	static constexpr std::size_t size = N;

src/libcamera/controls.cpp

@@ -60,6 +60,7 @@ static constexpr size_t ControlValueSize[] = {
 	[ControlTypeString]		= sizeof(char),
 	[ControlTypeRectangle]		= sizeof(Rectangle),
 	[ControlTypeSize]		= sizeof(Size),
+	[ControlTypePoint]		= sizeof(Point),
 };
 
 } /* namespace */
@@ -254,6 +255,11 @@ std::string ControlValue::toString() const
 			str += value->toString();
 			break;
 		}
+		case ControlTypePoint: {
+			const Point *value = reinterpret_cast<const Point *>(data);
+			str += value->toString();
+			break;
+		}
 		case ControlTypeNone:
 		case ControlTypeString:
 			break;