libcamera: Add operator<<() for pixel format classes

Implement the stream output operator<<() for the PixelFormat and
V4L2PixelFormat classes to simplify printing them.

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

src/libcamera/pixel_format.cpp

@@ -140,4 +140,16 @@ PixelFormat PixelFormat::fromString(const std::string &name)
 	return PixelFormatInfo::info(name).format;
 }
 
+/**
+ * \brief Insert a text representation of a PixelFormat into an output stream
+ * \param[in] out The output stream
+ * \param[in] f The PixelFormat
+ * \return The output stream \a out
+ */
+std::ostream &operator<<(std::ostream &out, const PixelFormat &f)
+{
+	out << f.toString();
+	return out;
+}
+
 } /* namespace libcamera */