ipa: libipa: pwl: Add a constructor that moves a Point vector

The Pwl::Pwl(const std::vector<Point> &) constructor is inefficient as
it makes a copy of the given points vector. Add a second constructor
that takes an rvalue reference to a points vector to provide move
semantics.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/libipa/pwl.cpp

@@ -114,6 +114,17 @@ Pwl::Pwl(const std::vector<Point> &points)
 {
 }
 
+/**
+ * \copydoc Pwl::Pwl(const std::vector<Point> &points)
+ *
+ * The contents of the \a points vector is moved to the newly constructed Pwl
+ * instance.
+ */
+Pwl::Pwl(std::vector<Point> &&points)
+	: points_(std::move(points))
+{
+}
+
 /**
  * \brief Populate the piecewise linear function from yaml data
  * \param[in] params Yaml data to populate the piecewise linear function with

src/ipa/libipa/pwl.h

@@ -47,6 +47,8 @@ public:
 
 	Pwl();
 	Pwl(const std::vector<Point> &points);
+	Pwl(std::vector<Point> &&points);
+
 	int readYaml(const libcamera::YamlObject &params);
 
 	void append(double x, double y, double eps = 1e-6);