libcamera: geometry: SizeRange: Add constructor for a single size

The SizeRange can describe a single size where min == max. Add a
constructor to help create such a description.

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

src/libcamera/geometry.cpp

@@ -196,6 +196,13 @@ bool operator<(const Size &lhs, const Size &rhs)
  * \brief Construct a size range initialized to 0
  */
 
+/**
+ * \fn SizeRange::SizeRange(unsigned int width, unsigned int height)
+ * \brief Construct a size range representing a single size
+ * \param[in] width The size width
+ * \param[in] height The size height
+ */
+
 /**
  * \fn SizeRange::SizeRange(unsigned int minW, unsigned int minH,
  *			    unsigned int maxW, unsigned int maxH)