void SkResourceCache::purgeAsNeeded(bool forcePurge) {
size_t byteLimit;
int countLimit;
if (fDiscardableFactory) {
countLimit = SK_DISCARDABLEMEMORY_SCALEDIMAGECACHE_COUNT_LIMIT;
byteLimit = SK_MaxU32; // no limit based on bytes
} else {
countLimit = SK_MaxS32; // no limit based on count
byteLimit = fTotalByteLimit;
}
Rec* rec = fTail;
while (rec) {
if (!forcePurge && fTotalBytesUsed < byteLimit && fCount < countLimit) {
break;
}
Rec* prev = rec->fPrev;
if (rec->canBePurged()) {
this->remove(rec);
}
rec = prev;
}
}
void SkResourceCache::add(Rec* rec, void* payload) {
this->checkMessages();
SkASSERT(rec);
// See if we already have this key (racy inserts, etc.)
if (Rec** preexisting = fHash->find(rec->getKey())) {
Rec* prev = *preexisting;
if (prev->canBePurged()) {
// if it can be purged, the install may fail, so we have to remove it
this->remove(prev);
} else {
// if it cannot be purged, we reuse it and delete the new one
prev->postAddInstall(payload);
delete rec;
return;
}
}
this->addToHead(rec);
fHash->set(rec);
rec->postAddInstall(payload);
if (gDumpCacheTransactions) {
SkString bytesStr, totalStr;
make_size_str(rec->bytesUsed(), &bytesStr);
make_size_str(fTotalBytesUsed, &totalStr);
SkDebugf("RC: add %5s %12p key %08x -- total %5s, count %d\n",
bytesStr.c_str(), rec, rec->getHash(), totalStr.c_str(), fCount);
}
// since the new rec may push us over-budget, we perform a purge check now
this->purgeAsNeeded();
}
void SkResourceCache::purgeSharedID(uint64_t sharedID) {
if (0 == sharedID) {
return;
}
#ifdef SK_TRACK_PURGE_SHAREDID_HITRATE
gPurgeCallCounter += 1;
bool found = false;
#endif
// go backwards, just like purgeAsNeeded, just to make the code similar.
// could iterate either direction and still be correct.
Rec* rec = fTail;
while (rec) {
Rec* prev = rec->fPrev;
if (rec->getKey().getSharedID() == sharedID) {
// even though the "src" is now dead, caches could still be in-flight, so
// we have to check if it can be removed.
if (rec->canBePurged()) {
this->remove(rec);
}
#ifdef SK_TRACK_PURGE_SHAREDID_HITRATE
found = true;
#endif
}
rec = prev;
}
#ifdef SK_TRACK_PURGE_SHAREDID_HITRATE
if (found) {
gPurgeHitCounter += 1;
}
SkDebugf("PurgeShared calls=%d hits=%d rate=%g\n", gPurgeCallCounter, gPurgeHitCounter,
gPurgeHitCounter * 100.0 / gPurgeCallCounter);
#endif
}
