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- /*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkCachedData_DEFINED
- #define SkCachedData_DEFINED
- #include "include/core/SkTypes.h"
- #include "include/private/SkMutex.h"
- #include "include/private/SkNoncopyable.h"
- class SkDiscardableMemory;
- class SkCachedData : ::SkNoncopyable {
- public:
- SkCachedData(void* mallocData, size_t size);
- SkCachedData(size_t size, SkDiscardableMemory*);
- virtual ~SkCachedData();
- size_t size() const { return fSize; }
- const void* data() const { return fData; }
- void* writable_data() { return fData; }
- void ref() const { this->internalRef(false); }
- void unref() const { this->internalUnref(false); }
- int testing_only_getRefCnt() const { return fRefCnt; }
- bool testing_only_isLocked() const { return fIsLocked; }
- bool testing_only_isInCache() const { return fInCache; }
- SkDiscardableMemory* diagnostic_only_getDiscardable() const {
- return kDiscardableMemory_StorageType == fStorageType ? fStorage.fDM : nullptr;
- }
- protected:
- // called when fData changes. could be nullptr.
- virtual void onDataChange(void* oldData, void* newData) {}
- private:
- SkMutex fMutex; // could use a pool of these...
- enum StorageType {
- kDiscardableMemory_StorageType,
- kMalloc_StorageType
- };
- union {
- SkDiscardableMemory* fDM;
- void* fMalloc;
- } fStorage;
- void* fData;
- size_t fSize;
- int fRefCnt; // low-bit means we're owned by the cache
- StorageType fStorageType;
- bool fInCache;
- bool fIsLocked;
- void internalRef(bool fromCache) const;
- void internalUnref(bool fromCache) const;
- void inMutexRef(bool fromCache);
- bool inMutexUnref(bool fromCache); // returns true if we should delete "this"
- void inMutexLock();
- void inMutexUnlock();
- // called whenever our fData might change (lock or unlock)
- void setData(void* newData) {
- if (newData != fData) {
- // notify our subclasses of the change
- this->onDataChange(fData, newData);
- fData = newData;
- }
- }
- class AutoMutexWritable;
- public:
- #ifdef SK_DEBUG
- void validate() const;
- #else
- void validate() const {}
- #endif
- /*
- * Attaching a data to to a SkResourceCache (only one at a time) enables the data to be
- * unlocked when the cache is the only owner, thus freeing it to be purged (assuming the
- * data is backed by a SkDiscardableMemory).
- *
- * When attached, it also automatically attempts to "lock" the data when the first client
- * ref's the data (typically from a find(key, visitor) call).
- *
- * Thus the data will always be "locked" when a non-cache has a ref on it (whether or not
- * the lock succeeded to recover the memory -- check data() to see if it is nullptr).
- */
- /*
- * Call when adding this instance to a SkResourceCache::Rec subclass
- * (typically in the Rec's constructor).
- */
- void attachToCacheAndRef() const { this->internalRef(true); }
- /*
- * Call when removing this instance from a SkResourceCache::Rec subclass
- * (typically in the Rec's destructor).
- */
- void detachFromCacheAndUnref() const { this->internalUnref(true); }
- };
- #endif
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