libcamera: utils: Add alignUp and alignDown functions

Add to libcamera utils library two functions to round up or down a
value to an alignment and add a test in test/utils.cpp for the two
new functions.

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

src/libcamera/utils.cpp

@@ -444,6 +444,22 @@ std::string libcameraSourcePath()
 	return path + "/";
 }
 
+/**
+ * \fn alignDown(unsigned int value, unsigned int alignment)
+ * \brief Align \a value down to \a alignment
+ * \param[in] value The value to align
+ * \param[in] alignment The alignment
+ * \return The value rounded down to the nearest multiple of \a alignment
+ */
+
+/**
+ * \fn alignUp(unsigned int value, unsigned int alignment)
+ * \brief Align \a value up to \a alignment
+ * \param[in] value The value to align
+ * \param[in] alignment The alignment
+ * \return The value rounded up to the nearest multiple of \a alignment
+ */
+
 } /* namespace utils */
 
 } /* namespace libcamera */