uint32_t SkPixelRef::getGenerationID() const {
uint32_t id = fTaggedGenID.load();
if (0 == id) {
uint32_t next = next_gen_id() | 1u;
if (fTaggedGenID.compare_exchange(&id, next)) {
id = next; // There was no race or we won the race. fTaggedGenID is next now.
} else {
// We lost a race to set fTaggedGenID. compare_exchange() filled id with the winner.
}
// We can't quite SkASSERT(this->genIDIsUnique()). It could be non-unique
// if we got here via the else path (pretty unlikely, but possible).
}
return id & ~1u; // Mask off bottom unique bit.
}
SkPixelRef::SkPixelRef(const SkImageInfo& info, SkBaseMutex* mutex)
: fInfo(validate_info(info))
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
, fStableID(next_gen_id())
#endif
{
this->setMutex(mutex);
fRec.zero();
fLockCount = 0;
this->needsNewGenID();
fIsImmutable = false;
fPreLocked = false;
fAddedToCache.store(false);
}
SkPixelRef::SkPixelRef(const SkImageInfo& info, SkBaseMutex* mutex)
: fInfo(validate_info(info))
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
, fStableID(next_gen_id())
#endif
{
#ifdef SK_TRACE_PIXELREF_LIFETIME
SkDebugf(" pixelref %d\n", sk_atomic_inc(&gInstCounter));
#endif
this->setMutex(mutex);
fRec.zero();
fLockCount = 0;
this->needsNewGenID();
fIsImmutable = false;
fPreLocked = false;
fAddedToCache.store(false);
}