/src/skia/src/core/SkCachedData.h
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1 | | /* |
2 | | * Copyright 2014 Google Inc. |
3 | | * |
4 | | * Use of this source code is governed by a BSD-style license that can be |
5 | | * found in the LICENSE file. |
6 | | */ |
7 | | |
8 | | #ifndef SkCachedData_DEFINED |
9 | | #define SkCachedData_DEFINED |
10 | | |
11 | | #include "include/core/SkTypes.h" |
12 | | #include "include/private/SkMutex.h" |
13 | | #include "include/private/SkNoncopyable.h" |
14 | | |
15 | | class SkDiscardableMemory; |
16 | | |
17 | | class SkCachedData : ::SkNoncopyable { |
18 | | public: |
19 | | SkCachedData(void* mallocData, size_t size); |
20 | | SkCachedData(size_t size, SkDiscardableMemory*); |
21 | | virtual ~SkCachedData(); |
22 | | |
23 | 610 | size_t size() const { return fSize; } |
24 | 775 | const void* data() const { return fData; } |
25 | | |
26 | 446 | void* writable_data() { return fData; } |
27 | | |
28 | 336 | void ref() const { this->internalRef(false); } |
29 | 782 | void unref() const { this->internalUnref(false); } |
30 | | |
31 | 0 | int testing_only_getRefCnt() const { return fRefCnt; } |
32 | 0 | bool testing_only_isLocked() const { return fIsLocked; } |
33 | 0 | bool testing_only_isInCache() const { return fInCache; } |
34 | | |
35 | 0 | SkDiscardableMemory* diagnostic_only_getDiscardable() const { |
36 | 0 | return kDiscardableMemory_StorageType == fStorageType ? fStorage.fDM : nullptr; |
37 | 0 | } |
38 | | |
39 | | protected: |
40 | | // called when fData changes. could be nullptr. |
41 | 771 | virtual void onDataChange(void* oldData, void* newData) {} |
42 | | |
43 | | private: |
44 | | SkMutex fMutex; // could use a pool of these... |
45 | | |
46 | | enum StorageType { |
47 | | kDiscardableMemory_StorageType, |
48 | | kMalloc_StorageType |
49 | | }; |
50 | | |
51 | | union { |
52 | | SkDiscardableMemory* fDM; |
53 | | void* fMalloc; |
54 | | } fStorage; |
55 | | void* fData; |
56 | | size_t fSize; |
57 | | int fRefCnt; // low-bit means we're owned by the cache |
58 | | StorageType fStorageType; |
59 | | bool fInCache; |
60 | | bool fIsLocked; |
61 | | |
62 | | void internalRef(bool fromCache) const; |
63 | | void internalUnref(bool fromCache) const; |
64 | | |
65 | | void inMutexRef(bool fromCache); |
66 | | bool inMutexUnref(bool fromCache); // returns true if we should delete "this" |
67 | | void inMutexLock(); |
68 | | void inMutexUnlock(); |
69 | | |
70 | | // called whenever our fData might change (lock or unlock) |
71 | 1.11k | void setData(void* newData) { |
72 | 1.11k | if (newData != fData) { |
73 | | // notify our subclasses of the change |
74 | 1.11k | this->onDataChange(fData, newData); |
75 | 1.11k | fData = newData; |
76 | 1.11k | } |
77 | 1.11k | } |
78 | | |
79 | | class AutoMutexWritable; |
80 | | |
81 | | public: |
82 | | #ifdef SK_DEBUG |
83 | | void validate() const; |
84 | | #else |
85 | 3.45k | void validate() const {} |
86 | | #endif |
87 | | |
88 | | /* |
89 | | * Attaching a data to to a SkResourceCache (only one at a time) enables the data to be |
90 | | * unlocked when the cache is the only owner, thus freeing it to be purged (assuming the |
91 | | * data is backed by a SkDiscardableMemory). |
92 | | * |
93 | | * When attached, it also automatically attempts to "lock" the data when the first client |
94 | | * ref's the data (typically from a find(key, visitor) call). |
95 | | * |
96 | | * Thus the data will always be "locked" when a non-cache has a ref on it (whether or not |
97 | | * the lock succeeded to recover the memory -- check data() to see if it is nullptr). |
98 | | */ |
99 | | |
100 | | /* |
101 | | * Call when adding this instance to a SkResourceCache::Rec subclass |
102 | | * (typically in the Rec's constructor). |
103 | | */ |
104 | 355 | void attachToCacheAndRef() const { this->internalRef(true); } |
105 | | |
106 | | /* |
107 | | * Call when removing this instance from a SkResourceCache::Rec subclass |
108 | | * (typically in the Rec's destructor). |
109 | | */ |
110 | 255 | void detachFromCacheAndUnref() const { this->internalUnref(true); } |
111 | | }; |
112 | | |
113 | | #endif |