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Side by Side Diff: src/core/SkResourceCache.h

Issue 511283002: rename ScaledImageCache to ResourceCache (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: rebase Created 6 years, 3 months ago
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1 /* 1 /*
2 * Copyright 2013 Google Inc. 2 * Copyright 2013 Google Inc.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license that can be 4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file. 5 * found in the LICENSE file.
6 */ 6 */
7 7
8 #ifndef SkScaledImageCache_DEFINED 8 #ifndef SkResourceCache_DEFINED
9 #define SkScaledImageCache_DEFINED 9 #define SkResourceCache_DEFINED
10 10
11 #include "SkBitmap.h" 11 #include "SkBitmap.h"
12 12
13 class SkDiscardableMemory; 13 class SkDiscardableMemory;
14 class SkMipMap; 14 class SkMipMap;
15 15
16 /** 16 /**
17 * Cache object for bitmaps (with possible scale in X Y as part of the key). 17 * Cache object for bitmaps (with possible scale in X Y as part of the key).
18 * 18 *
19 * Multiple caches can be instantiated, but each instance is not implicitly 19 * Multiple caches can be instantiated, but each instance is not implicitly
20 * thread-safe, so if a given instance is to be shared across threads, the 20 * thread-safe, so if a given instance is to be shared across threads, the
21 * caller must manage the access itself (e.g. via a mutex). 21 * caller must manage the access itself (e.g. via a mutex).
22 * 22 *
23 * As a convenience, a global instance is also defined, which can be safely 23 * As a convenience, a global instance is also defined, which can be safely
24 * access across threads via the static methods (e.g. FindAndLock, etc.). 24 * access across threads via the static methods (e.g. FindAndLock, etc.).
25 */ 25 */
26 class SkScaledImageCache { 26 class SkResourceCache {
27 public: 27 public:
28 struct Key { 28 struct Key {
29 // Call this to access your private contents. Must not use the address a fter calling init() 29 // Call this to access your private contents. Must not use the address a fter calling init()
30 void* writableContents() { return this + 1; } 30 void* writableContents() { return this + 1; }
31 31
32 // must call this after your private data has been written. 32 // must call this after your private data has been written.
33 // length must be a multiple of 4 33 // length must be a multiple of 4
34 void init(size_t length); 34 void init(size_t length);
35 35
36 // This is only valid after having called init(). 36 // This is only valid after having called init().
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51 // store fCount32 first, so we don't consider it in operator< 51 // store fCount32 first, so we don't consider it in operator<
52 int32_t fCount32; // 2 + user contents count32 52 int32_t fCount32; // 2 + user contents count32
53 uint32_t fHash; 53 uint32_t fHash;
54 /* uint32_t fContents32[] */ 54 /* uint32_t fContents32[] */
55 55
56 const uint32_t* as32() const { return (const uint32_t*)this; } 56 const uint32_t* as32() const { return (const uint32_t*)this; }
57 const uint32_t* as32SkipCount() const { return this->as32() + 1; } 57 const uint32_t* as32SkipCount() const { return this->as32() + 1; }
58 }; 58 };
59 59
60 struct Rec { 60 struct Rec {
61 typedef SkScaledImageCache::Key Key; 61 typedef SkResourceCache::Key Key;
62 62
63 Rec() : fLockCount(1) {} 63 Rec() : fLockCount(1) {}
64 virtual ~Rec() {} 64 virtual ~Rec() {}
65 65
66 uint32_t getHash() const { return this->getKey().hash(); } 66 uint32_t getHash() const { return this->getKey().hash(); }
67 67
68 virtual const Key& getKey() const = 0; 68 virtual const Key& getKey() const = 0;
69 virtual size_t bytesUsed() const = 0; 69 virtual size_t bytesUsed() const = 0;
70 70
71 // for SkTDynamicHash::Traits 71 // for SkTDynamicHash::Traits
72 static uint32_t Hash(const Key& key) { return key.hash(); } 72 static uint32_t Hash(const Key& key) { return key.hash(); }
73 static const Key& GetKey(const Rec& rec) { return rec.getKey(); } 73 static const Key& GetKey(const Rec& rec) { return rec.getKey(); }
74 74
75 private: 75 private:
76 Rec* fNext; 76 Rec* fNext;
77 Rec* fPrev; 77 Rec* fPrev;
78 int32_t fLockCount; 78 int32_t fLockCount;
79 int32_t fPad; 79 int32_t fPad;
80 80
81 friend class SkScaledImageCache; 81 friend class SkResourceCache;
82 }; 82 };
83 83
84 typedef const Rec* ID; 84 typedef const Rec* ID;
85 85
86 /** 86 /**
87 * Returns a locked/pinned SkDiscardableMemory instance for the specified 87 * Returns a locked/pinned SkDiscardableMemory instance for the specified
88 * number of bytes, or NULL on failure. 88 * number of bytes, or NULL on failure.
89 */ 89 */
90 typedef SkDiscardableMemory* (*DiscardableFactory)(size_t bytes); 90 typedef SkDiscardableMemory* (*DiscardableFactory)(size_t bytes);
91 91
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115 115
116 /////////////////////////////////////////////////////////////////////////// 116 ///////////////////////////////////////////////////////////////////////////
117 117
118 /** 118 /**
119 * Construct the cache to call DiscardableFactory when it 119 * Construct the cache to call DiscardableFactory when it
120 * allocates memory for the pixels. In this mode, the cache has 120 * allocates memory for the pixels. In this mode, the cache has
121 * not explicit budget, and so methods like getTotalBytesUsed() 121 * not explicit budget, and so methods like getTotalBytesUsed()
122 * and getTotalByteLimit() will return 0, and setTotalByteLimit 122 * and getTotalByteLimit() will return 0, and setTotalByteLimit
123 * will ignore its argument and return 0. 123 * will ignore its argument and return 0.
124 */ 124 */
125 SkScaledImageCache(DiscardableFactory); 125 SkResourceCache(DiscardableFactory);
126 126
127 /** 127 /**
128 * Construct the cache, allocating memory with malloc, and respect the 128 * Construct the cache, allocating memory with malloc, and respect the
129 * byteLimit, purging automatically when a new image is added to the cache 129 * byteLimit, purging automatically when a new image is added to the cache
130 * that pushes the total bytesUsed over the limit. Note: The limit can be 130 * that pushes the total bytesUsed over the limit. Note: The limit can be
131 * changed at runtime with setTotalByteLimit. 131 * changed at runtime with setTotalByteLimit.
132 */ 132 */
133 explicit SkScaledImageCache(size_t byteLimit); 133 explicit SkResourceCache(size_t byteLimit);
134 ~SkScaledImageCache(); 134 ~SkResourceCache();
135 135
136 const Rec* findAndLock(const Key& key); 136 const Rec* findAndLock(const Key& key);
137 const Rec* addAndLock(Rec*); 137 const Rec* addAndLock(Rec*);
138 void add(Rec*); 138 void add(Rec*);
139 139
140 /** 140 /**
141 * Given a non-null ID ptr returned by either findAndLock or addAndLock, 141 * Given a non-null ID ptr returned by either findAndLock or addAndLock,
142 * this releases the associated resources to be available to be purged 142 * this releases the associated resources to be available to be purged
143 * if needed. After this, the cached bitmap should no longer be 143 * if needed. After this, the cached bitmap should no longer be
144 * referenced by the caller. 144 * referenced by the caller.
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195 195
196 void init(); // called by constructors 196 void init(); // called by constructors
197 197
198 #ifdef SK_DEBUG 198 #ifdef SK_DEBUG
199 void validate() const; 199 void validate() const;
200 #else 200 #else
201 void validate() const {} 201 void validate() const {}
202 #endif 202 #endif
203 }; 203 };
204 #endif 204 #endif
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