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138 lines
3.3 KiB
C++
138 lines
3.3 KiB
C++
/* $Id$ */
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/** @file factory.hpp Factory to 'query' all available blitters. */
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#ifndef BLITTER_FACTORY_HPP
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#define BLITTER_FACTORY_HPP
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#include "base.hpp"
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#include "../debug.h"
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#include "../string_func.h"
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#include <string>
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#include <map>
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/**
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* The base factory, keeping track of all blitters.
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*/
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class BlitterFactoryBase {
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private:
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char *name;
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typedef std::map<std::string, BlitterFactoryBase *> Blitters;
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static Blitters &GetBlitters()
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{
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static Blitters &s_blitters = *new Blitters();
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return s_blitters;
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}
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static Blitter **GetActiveBlitter()
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{
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static Blitter *s_blitter = NULL;
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return &s_blitter;
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}
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protected:
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/**
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* Register a blitter internally, based on his name.
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* @param name the name of the blitter.
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* @note an assert() will be trigger if 2 blitters with the same name try to register.
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*/
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void RegisterBlitter(const char *name)
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{
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/* Don't register nameless Blitters */
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if (name == NULL) return;
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this->name = strdup(name);
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#if !defined(NDEBUG) || defined(WITH_ASSERT)
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/* NDEBUG disables asserts and gives a warning: unused variable 'P' */
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std::pair<Blitters::iterator, bool> P =
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#endif /* !NDEBUG */
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GetBlitters().insert(Blitters::value_type(name, this));
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assert(P.second);
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}
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public:
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BlitterFactoryBase() :
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name(NULL)
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{}
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virtual ~BlitterFactoryBase() { if (this->name != NULL) GetBlitters().erase(this->name); free(this->name); }
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/**
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* Find the requested blitter and return his class.
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* @param name the blitter to select.
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* @post Sets the blitter so GetCurrentBlitter() returns it too.
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*/
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static Blitter *SelectBlitter(const char *name)
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{
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const char *default_blitter = "8bpp-optimized";
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if (GetBlitters().size() == 0) return NULL;
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const char *bname = (StrEmpty(name)) ? default_blitter : name;
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Blitters::iterator it = GetBlitters().begin();
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for (; it != GetBlitters().end(); it++) {
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BlitterFactoryBase *b = (*it).second;
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if (strcasecmp(bname, b->name) == 0) {
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Blitter *newb = b->CreateInstance();
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delete *GetActiveBlitter();
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*GetActiveBlitter() = newb;
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DEBUG(driver, 1, "Successfully %s blitter '%s'",StrEmpty(name) ? "probed" : "loaded", bname);
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return newb;
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}
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}
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return NULL;
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}
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/**
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* Get the current active blitter (always set by calling SelectBlitter).
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*/
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static Blitter *GetCurrentBlitter()
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{
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return *GetActiveBlitter();
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}
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static char *GetBlittersInfo(char *p, const char *last)
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{
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p += snprintf(p, last - p, "List of blitters:\n");
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Blitters::iterator it = GetBlitters().begin();
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for (; it != GetBlitters().end(); it++) {
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BlitterFactoryBase *b = (*it).second;
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p += snprintf(p, last - p, "%18s: %s\n", b->name, b->GetDescription());
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}
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p += snprintf(p, last - p, "\n");
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return p;
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}
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/**
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* Get a nice description of the blitter-class.
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*/
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virtual const char *GetDescription() = 0;
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/**
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* Create an instance of this Blitter-class.
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*/
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virtual Blitter *CreateInstance() = 0;
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};
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/**
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* A template factory, so ->GetName() works correctly. This because else some compiler will complain.
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*/
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template <class T>
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class BlitterFactory: public BlitterFactoryBase {
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public:
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BlitterFactory() { this->RegisterBlitter(((T *)this)->GetName()); }
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/**
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* Get the long, human readable, name for the Blitter-class.
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*/
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const char *GetName();
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};
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extern char _ini_blitter[32];
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#endif /* BLITTER_FACTORY_HPP */
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