| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrNonAtomicRef_DEFINED |
| #define GrNonAtomicRef_DEFINED |
| |
| #include "include/core/SkRefCnt.h" |
| #include "include/private/base/SkNoncopyable.h" |
| #include "include/private/base/SkTArray.h" |
| |
| /** |
| * A simple non-atomic ref used in the GrBackendApi when we don't want to pay for the overhead of a |
| * threadsafe ref counted object |
| */ |
| template<typename TSubclass> class GrNonAtomicRef : public SkNoncopyable { |
| public: |
| GrNonAtomicRef() : fRefCnt(1) {} |
| |
| #ifdef SK_DEBUG |
| ~GrNonAtomicRef() { |
| // fRefCnt can be one when a subclass is created statically |
| SkASSERT((0 == fRefCnt || 1 == fRefCnt)); |
| // Set to invalid values. |
| fRefCnt = -10; |
| } |
| #endif |
| |
| bool unique() const { return 1 == fRefCnt; } |
| |
| // We allow this getter because this type is not thread-safe, meaning only one thread should |
| // have ownership and be manipulating the ref count or querying this. |
| int refCnt() const { return fRefCnt; } |
| |
| void ref() const { |
| // Once the ref cnt reaches zero it should never be ref'ed again. |
| SkASSERT(fRefCnt > 0); |
| ++fRefCnt; |
| } |
| |
| void unref() const { |
| SkASSERT(fRefCnt > 0); |
| --fRefCnt; |
| if (0 == fRefCnt) { |
| GrTDeleteNonAtomicRef(static_cast<const TSubclass*>(this)); |
| return; |
| } |
| } |
| |
| private: |
| mutable int32_t fRefCnt; |
| |
| using INHERITED = SkNoncopyable; |
| }; |
| |
| template<typename T> inline void GrTDeleteNonAtomicRef(const T* ref) { |
| delete ref; |
| } |
| |
| #endif |