/**
* Find the requested blitter and return his class.
* @param name the blitter to select.
* @post Sets the blitter so GetCurrentBlitter() returns it too.
*/
static Blitter *SelectBlitter(const char *name)
{
#if defined(DEDICATED)
const char *default_blitter = "null";
#else
const char *default_blitter = "8bpp-optimized";
#if defined(WITH_COCOA)
/* Some people reported lack of fullscreen support in 8 bpp mode.
* While we prefer 8 bpp since it's faster, we will still have to test for support. */
if (!QZ_CanDisplay8bpp()) {
/* The main display can't go to 8 bpp fullscreen mode.
* We will have to switch to 32 bpp by default. */
default_blitter = "32bpp-anim";
}
#endif /* defined(WITH_COCOA) */
#endif /* defined(DEDICATED) */
if (GetBlitters().size() == 0) return NULL;
const char *bname = (StrEmpty(name)) ? default_blitter : name;
Blitters::iterator it = GetBlitters().begin();
for (; it != GetBlitters().end(); it++) {
BlitterFactoryBase *b = (*it).second;
if (strcasecmp(bname, b->name) == 0) {
Blitter *newb = b->CreateInstance();
delete *GetActiveBlitter();
*GetActiveBlitter() = newb;
DEBUG(driver, 1, "Successfully %s blitter '%s'", StrEmpty(name) ? "probed" : "loaded", bname);
return newb;
}
}
return NULL;
}
/**
* Find the requested blitter and return his class.
* @param name the blitter to select.
* @post Sets the blitter so GetCurrentBlitter() returns it too.
*/
static Blitter *SelectBlitter(const char *name)
{
BlitterFactory *b = GetBlitterFactory(name);
if (b == nullptr) return nullptr;
Blitter *newb = b->CreateInstance();
delete *GetActiveBlitter();
*GetActiveBlitter() = newb;
DEBUG(driver, 1, "Successfully %s blitter '%s'", StrEmpty(name) ? "probed" : "loaded", newb->GetName());
return newb;
}
/**
* Find the requested blitter and return his class.
* @param name the blitter to select.
* @post Sets the blitter so GetCurrentBlitter() returns it too.
*/
static Blitter *SelectBlitter(const char *name)
{
BlitterFactory *b = GetBlitterFactory(name);
if (b == NULL) return NULL;
//用工厂生成一个Blitter
Blitter *newb = b->CreateInstance();
delete *GetActiveBlitter();
//得到的是双重地址,可以复制的.
*GetActiveBlitter() = newb;
DEBUG(driver, 1, "Successfully %s blitter '%s'", StrEmpty(name) ? "probed" : "loaded", newb->GetName());
return newb;
}
/**
* Get the current active blitter (always set by calling SelectBlitter).
*/
static Blitter *GetCurrentBlitter()
{
return *GetActiveBlitter();
}
