1

/* $Id$ */

     2

     3

#ifndef BLITTER_FACTORY_HPP

     4

#define BLITTER_FACTORY_HPP

     5

     6

#include "base.hpp"

     7

#include <string>

     8

#include <map>

     9

    10

/**

    11

 * The base factory, keeping track of all blitters.

    12

 */

    13

class BlitterFactoryBase {

    14

private:

    15

	char *name;

    16

	typedef std::map<std::string, BlitterFactoryBase *> Blitters;

    17

    18

	static Blitters &GetBlitters()

    19

	{

    20

		static Blitters &s_blitters = *new Blitters();

    21

		return s_blitters;

    22

	}

    23

    24

	static Blitter **GetActiveBlitter()

    25

	{

    26

		static Blitter *s_blitter = NULL;

    27

		return &s_blitter;

    28

	}

    29

    30

protected:

    31

	/**

    32

	 * Register a blitter internally, based on his name.

    33

	 * @param name the name of the blitter.

    34

	 * @note an assert() will be trigger if 2 blitters with the same name try to register.

    35

	 */

    36

	void RegisterBlitter(const char *name)

    37

	{

    38

		/* Don't register nameless Blitters */

    39

		if (name == NULL) return;

    40

    41

		this->name = strdup(name);

    47

		assert(P.second);

    48

	}

    49

    50

public:

    51

	BlitterFactoryBase() :

    52

		name(NULL)

    53

	{}

    54

    55

	virtual ~BlitterFactoryBase() { if (this->name != NULL) GetBlitters().erase(this->name); free(this->name); }

    56

    57

	/**

    58

	 * Find the requested blitter and return his class.

    59

	 * @param name the blitter to select.

    60

	 * @post Sets the blitter so GetCurrentBlitter() returns it too.

    61

	 */

    62

	static Blitter *SelectBlitter(const char *name)

    63

	{

    64

		if (GetBlitters().size() == 0) return NULL;

    65

    66

		Blitters::iterator it = GetBlitters().begin();

    67

		for (; it != GetBlitters().end(); it++) {

    68

			BlitterFactoryBase *b = (*it).second;

    69

			if (strcasecmp(name, b->name) == 0) {

    70

				Blitter *newb = b->CreateInstance();

    71

				delete *GetActiveBlitter();

    72

				*GetActiveBlitter() = newb;

    73

				return newb;

    74

			}

    75

		}

    76

		return NULL;

    77

	}

    78

    79

	/**

    80

	 * Get the current active blitter (always set by calling SelectBlitter).

    81

	 */

    82

	static Blitter *GetCurrentBlitter()

    83

	{

    84

		return *GetActiveBlitter();

    85

	}

    86

    87

    88

	static char *GetBlittersInfo(char *p, const char *last)

    89

	{

    90

		p += snprintf(p, last - p, "List of blitters:\n");

    91

		Blitters::iterator it = GetBlitters().begin();

    92

		for (; it != GetBlitters().end(); it++) {

    93

			BlitterFactoryBase *b = (*it).second;

    94

			p += snprintf(p, last - p, "%18s: %s\n", b->name, b->GetDescription());

    95

		}

    96

		p += snprintf(p, last - p, "\n");

    97

    98

		return p;

    99

	}

   100

   101

	/**

   102

	 * Get a nice description of the blitter-class.

   103

	 */

   104

	virtual const char *GetDescription() = 0;

   105

   106

	/**

   107

	 * Create an instance of this Blitter-class.

   108

	 */

   109

	virtual Blitter *CreateInstance() = 0;

   110

};

   111

   112

/**

   113

 * A template factory, so ->GetName() works correctly. This because else some compiler will complain.

   114

 */

   115

template <class T>

   116

class BlitterFactory: public BlitterFactoryBase {

   117

public:

   118

	BlitterFactory() { this->RegisterBlitter(((T *)this)->GetName()); }

   119

   120

	/**

   121

	 * Get the long, human readable, name for the Blitter-class.

   122

	 */

   123

	const char *GetName();

   124

};

   125

   126

#endif /* BLITTER_FACTORY_HPP */