truelight@7433: /* $Id$ */
truelight@7433: 
truelight@7433: #ifndef BLITTER_FACTORY_HPP
truelight@7433: #define BLITTER_FACTORY_HPP
truelight@7433: 
truelight@7433: #include "base.hpp"
truelight@7433: #include <string>
truelight@7433: #include <map>
truelight@7433: 
truelight@7433: /**
truelight@7433:  * The base factory, keeping track of all blitters.
truelight@7433:  */
truelight@7433: class BlitterFactoryBase {
truelight@7433: private:
truelight@7433: 	char *name;
truelight@7433: 	typedef std::map<std::string, BlitterFactoryBase *> Blitters;
truelight@7433: 
truelight@7433: 	static Blitters &GetBlitters()
truelight@7433: 	{
truelight@7433: 		static Blitters &s_blitters = *new Blitters();
truelight@7433: 		return s_blitters;
truelight@7433: 	}
truelight@7433: 
truelight@7433: 	static Blitter **GetActiveBlitter()
truelight@7433: 	{
truelight@7433: 		static Blitter *s_blitter = NULL;
truelight@7433: 		return &s_blitter;
truelight@7433: 	}
truelight@7433: 
truelight@7433: protected:
truelight@7433: 	/**
truelight@7433: 	 * Register a blitter internally, based on his name.
truelight@7433: 	 * @param name the name of the blitter.
truelight@7433: 	 * @note an assert() will be trigger if 2 blitters with the same name try to register.
truelight@7433: 	 */
truelight@7433: 	void RegisterBlitter(const char *name)
truelight@7433: 	{
truelight@7433: 		/* Don't register nameless Blitters */
truelight@7433: 		if (name == NULL) return;
truelight@7433: 
truelight@7433: 		this->name = strdup(name);
truelight@7750: #if !defined(NDEBUG)
truelight@7750: 		/* NDEBUG disables asserts and gives a warning: unused variable 'P' */
truelight@7750: 		std::pair<Blitters::iterator, bool> P =
truelight@7750: #endif /* !NDEBUG */
truelight@7750: 		GetBlitters().insert(Blitters::value_type(name, this));
truelight@7433: 		assert(P.second);
truelight@7433: 	}
truelight@7433: 
truelight@7433: public:
truelight@7433: 	BlitterFactoryBase() :
truelight@7433: 		name(NULL)
truelight@7433: 	{}
truelight@7433: 
truelight@7433: 	virtual ~BlitterFactoryBase() { if (this->name != NULL) GetBlitters().erase(this->name); free(this->name); }
truelight@7433: 
truelight@7433: 	/**
truelight@7433: 	 * Find the requested blitter and return his class.
truelight@7433: 	 * @param name the blitter to select.
truelight@7433: 	 * @post Sets the blitter so GetCurrentBlitter() returns it too.
truelight@7433: 	 */
truelight@7433: 	static Blitter *SelectBlitter(const char *name)
truelight@7433: 	{
truelight@7433: 		if (GetBlitters().size() == 0) return NULL;
truelight@7433: 
truelight@7433: 		Blitters::iterator it = GetBlitters().begin();
truelight@7433: 		for (; it != GetBlitters().end(); it++) {
truelight@7433: 			BlitterFactoryBase *b = (*it).second;
truelight@7433: 			if (strcasecmp(name, b->name) == 0) {
truelight@7433: 				Blitter *newb = b->CreateInstance();
rubidium@7587: 				delete *GetActiveBlitter();
truelight@7433: 				*GetActiveBlitter() = newb;
truelight@7433: 				return newb;
truelight@7433: 			}
truelight@7433: 		}
truelight@7433: 		return NULL;
truelight@7433: 	}
truelight@7433: 
truelight@7433: 	/**
truelight@7433: 	 * Get the current active blitter (always set by calling SelectBlitter).
truelight@7433: 	 */
truelight@7433: 	static Blitter *GetCurrentBlitter()
truelight@7433: 	{
truelight@7433: 		return *GetActiveBlitter();
truelight@7433: 	}
truelight@7433: 
truelight@7433: 
truelight@7433: 	static char *GetBlittersInfo(char *p, const char *last)
truelight@7433: 	{
truelight@7433: 		p += snprintf(p, last - p, "List of blitters:\n");
truelight@7433: 		Blitters::iterator it = GetBlitters().begin();
truelight@7433: 		for (; it != GetBlitters().end(); it++) {
truelight@7433: 			BlitterFactoryBase *b = (*it).second;
truelight@7433: 			p += snprintf(p, last - p, "%18s: %s\n", b->name, b->GetDescription());
truelight@7433: 		}
truelight@7433: 		p += snprintf(p, last - p, "\n");
truelight@7433: 
truelight@7433: 		return p;
truelight@7433: 	}
truelight@7433: 
truelight@7433: 	/**
truelight@7433: 	 * Get a nice description of the blitter-class.
truelight@7433: 	 */
truelight@7433: 	virtual const char *GetDescription() = 0;
truelight@7433: 
truelight@7433: 	/**
truelight@7433: 	 * Create an instance of this Blitter-class.
truelight@7433: 	 */
truelight@7433: 	virtual Blitter *CreateInstance() = 0;
truelight@7433: };
truelight@7433: 
truelight@7433: /**
truelight@7433:  * A template factory, so ->GetName() works correctly. This because else some compiler will complain.
truelight@7433:  */
truelight@7433: template <class T>
truelight@7433: class BlitterFactory: public BlitterFactoryBase {
truelight@7433: public:
truelight@7433: 	BlitterFactory() { this->RegisterBlitter(((T *)this)->GetName()); }
truelight@7433: 
truelight@7433: 	/**
truelight@7433: 	 * Get the long, human readable, name for the Blitter-class.
truelight@7433: 	 */
truelight@7433: 	const char *GetName();
truelight@7433: };
truelight@7433: 
truelight@7433: #endif /* BLITTER_FACTORY_HPP */