backend: frontend: Mark class BackEnd and FrontEnd final

These cannot be used to make a derived class.  Also change the protected
section to private.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>

src/libpisp/backend/backend.hpp

@@ -22,7 +22,7 @@
 namespace libpisp
 {
 
-class BackEnd
+class BackEnd final
 {
 public:
 	struct Config
@@ -146,7 +146,7 @@ class BackEnd
 		return mutex_.try_lock();
 	}
 
-protected:
+private:
 	void finaliseConfig();
 	void updateSmartResize();
 	void updateTiles();
@@ -168,7 +168,6 @@ class BackEnd
 	std::vector<SmartResize> smart_resize_;
 	uint32_t smart_resize_dirty_;
 
-private:
 	// Default config
 	std::map<std::string, pisp_be_ccm_config> ycbcr_map_;
 	std::map<std::string, pisp_be_ccm_config> inverse_ycbcr_map_;

src/libpisp/frontend/frontend.hpp

@@ -19,7 +19,7 @@
 namespace libpisp
 {
 
-class FrontEnd
+class FrontEnd final
 {
 public:
 	static constexpr uint32_t ScalePrecision = 10;
@@ -70,7 +70,7 @@ class FrontEnd
 		return mutex_.try_lock();
 	}
 
-protected: // TODO: Should be private
+private:
 	void getOutputSize(unsigned int output_num, uint16_t &width, uint16_t &height) const;
 
 	const PiSPVariant &variant_;