/**
* Fill a buffer with information about the blitters.
* @param p The buffer to fill.
* @param last The last element of the buffer.
* @return p The location till where we filled the buffer.
*/
static char *GetBlittersInfo(char *p, const char *last)
{
p += seprintf(p, last, "List of blitters:\n");
Blitters::iterator it = GetBlitters().begin();
for (; it != GetBlitters().end(); it++) {
BlitterFactory *b = (*it).second;
p += seprintf(p, last, "%18s: %s\n", b->name, b->GetDescription());
}
p += seprintf(p, last, "\n");
return p;
}
/**
* 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;
}
