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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTextBlobCache.h"
DECLARE_SKMESSAGEBUS_MESSAGE(GrTextBlobCache::PurgeBlobMessage)
GrTextBlobCache::~GrTextBlobCache() {
this->freeAll();
delete fPool;
}
void GrTextBlobCache::freeAll() {
fBlobIDCache.foreach([this](uint32_t, BlobIDCacheEntry* entry) {
for (const auto& blob : entry->fBlobs) {
fBlobList.remove(blob.get());
}
});
fBlobIDCache.reset();
// There should be no allocations in the memory pool at this point
SkASSERT(!fPool || fPool->isEmpty());
SkASSERT(fBlobList.isEmpty());
}
void GrTextBlobCache::PostPurgeBlobMessage(uint32_t blobID, uint32_t cacheID) {
SkASSERT(blobID != SK_InvalidGenID);
SkMessageBus<PurgeBlobMessage>::Post(PurgeBlobMessage({blobID}), cacheID);
}
void GrTextBlobCache::purgeStaleBlobs() {
SkTArray<PurgeBlobMessage> msgs;
fPurgeBlobInbox.poll(&msgs);
for (const auto& msg : msgs) {
auto* idEntry = fBlobIDCache.find(msg.fID);
if (!idEntry) {
// no cache entries for id
continue;
}
// remove all blob entries from the LRU list
for (const auto& blob : idEntry->fBlobs) {
fBlobList.remove(blob.get());
}
// drop the idEntry itself (unrefs all blobs)
fBlobIDCache.remove(msg.fID);
}
}
bool GrTextBlobCache::overBudget() const {
if (fPool) {
return fPool->size() > fBudget;
}
// When DDLs are being recorded no GrAtlasTextBlob will be deleted so the cache budget is
// somewhat meaningless.
return false;
}
void GrTextBlobCache::checkPurge(GrAtlasTextBlob* blob) {
// First, purge all stale blob IDs.
this->purgeStaleBlobs();
// If we are still over budget, then unref until we are below budget again
if (this->overBudget()) {
BitmapBlobList::Iter iter;
iter.init(fBlobList, BitmapBlobList::Iter::kTail_IterStart);
GrAtlasTextBlob* lruBlob = nullptr;
while (this->overBudget() && (lruBlob = iter.get()) && lruBlob != blob) {
// Backup the iterator before removing and unrefing the blob
iter.prev();
this->remove(lruBlob);
}
// If we break out of the loop with lruBlob == blob, then we haven't purged enough
// use the call back and try to free some more. If we are still overbudget after this,
// then this single textblob is over our budget
if (blob && lruBlob == blob) {
(*fCallback)(fData);
}
#ifdef SPEW_BUDGET_MESSAGE
if (this->overBudget()) {
SkDebugf("Single textblob is larger than our whole budget");
}
#endif
}
}
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