libcamera: geometry: SizeRange: Add toString()

It's useful to be able to print a string representation of a SizeRange
to the log or console, add a toString() method. While at it turn the
structure into a class as it contains functions as well as data.

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

2 files changed, 19 insertions, 1 deletions

diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
index b2a8e5b0..03962d7d 100644
--- a/include/libcamera/geometry.h
+++ b/include/libcamera/geometry.h
@@ -67,7 +67,9 @@ static inline bool operator>=(const Size &lhs, const Size &rhs)
 	return !(lhs < rhs);
 }
 
-struct SizeRange {
+class SizeRange
+{
+public:
 	SizeRange()
 	{
 	}
@@ -90,6 +92,8 @@ struct SizeRange {
 	{
 	}
 
+	std::string toString() const;
+
 	Size min;
 	Size max;
 	unsigned int hStep;
diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
index 1ea10293..e598f6ad 100644
--- a/src/libcamera/geometry.cpp
+++ b/src/libcamera/geometry.cpp
@@ -267,6 +267,20 @@ bool operator<(const Size &lhs, const Size &rhs)
  */
 
 /**
+ * \brief Assemble and return a string describing the size range
+ * \return A string describing the SizeRange
+ */
+std::string SizeRange::toString() const
+{
+	std::stringstream ss;
+
+	ss << "(" << min.toString() << ")-(" << max.toString() << ")/(+"
+	   << hStep << ",+" << vStep << ")";
+
+	return ss.str();
+}
+
+/**
  * \brief Compare size ranges for equality
  * \return True if the two size ranges are equal, false otherwise
  */