1/*
2 * Copyright 2015 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 GrTextBlobCache_DEFINED
9#define GrTextBlobCache_DEFINED
10
11#include "include/core/SkRefCnt.h"
12#include "include/private/SkMutex.h"
13#include "include/private/SkTArray.h"
14#include "include/private/SkTHash.h"
15#include "src/core/SkMessageBus.h"
16#include "src/core/SkTextBlobPriv.h"
17#include "src/gpu/text/GrTextBlob.h"
18
19#include <functional>
20
21class GrTextBlobCache {
22public:
23 GrTextBlobCache(uint32_t messageBusID);
24
25 sk_sp<GrTextBlob> makeCachedBlob(const SkGlyphRunList& glyphRunList,
26 const GrTextBlob::Key& key,
27 const SkMaskFilterBase::BlurRec& blurRec,
28 const SkMatrix& viewMatrix) SK_EXCLUDES(fSpinLock);
29
30 sk_sp<GrTextBlob> find(const GrTextBlob::Key& key) SK_EXCLUDES(fSpinLock);
31
32 void remove(GrTextBlob* blob) SK_EXCLUDES(fSpinLock);
33
34 void freeAll() SK_EXCLUDES(fSpinLock);
35
36 struct PurgeBlobMessage {
37 PurgeBlobMessage(uint32_t blobID, uint32_t contextUniqueID)
38 : fBlobID(blobID), fContextID(contextUniqueID) {}
39
40 uint32_t fBlobID;
41 uint32_t fContextID;
42 };
43
44 static void PostPurgeBlobMessage(uint32_t blobID, uint32_t cacheID);
45
46 void purgeStaleBlobs() SK_EXCLUDES(fSpinLock);
47
48 size_t usedBytes() const SK_EXCLUDES(fSpinLock);
49
50 bool isOverBudget() const SK_EXCLUDES(fSpinLock);
51
52private:
53 friend class GrTextBlobTestingPeer;
54 using TextBlobList = SkTInternalLList<GrTextBlob>;
55
56 struct BlobIDCacheEntry {
57 BlobIDCacheEntry();
58 explicit BlobIDCacheEntry(uint32_t id);
59
60 static uint32_t GetKey(const BlobIDCacheEntry& entry);
61
62 void addBlob(sk_sp<GrTextBlob> blob);
63
64 void removeBlob(GrTextBlob* blob);
65
66 sk_sp<GrTextBlob> find(const GrTextBlob::Key& key) const;
67
68 int findBlobIndex(const GrTextBlob::Key& key) const;
69
70 uint32_t fID;
71 // Current clients don't generate multiple GrAtlasTextBlobs per SkTextBlob, so an array w/
72 // linear search is acceptable. If usage changes, we should re-evaluate this structure.
73 SkSTArray<1, sk_sp<GrTextBlob>> fBlobs;
74 };
75
76 void internalPurgeStaleBlobs() SK_REQUIRES(fSpinLock);
77
78 void internalAdd(sk_sp<GrTextBlob> blob) SK_REQUIRES(fSpinLock);
79 void internalRemove(GrTextBlob* blob) SK_REQUIRES(fSpinLock);
80
81 void internalCheckPurge(GrTextBlob* blob = nullptr) SK_REQUIRES(fSpinLock);
82
83 static const int kDefaultBudget = 1 << 22;
84
85 mutable SkSpinlock fSpinLock;
86 TextBlobList fBlobList SK_GUARDED_BY(fSpinLock);
87 SkTHashMap<uint32_t, BlobIDCacheEntry> fBlobIDCache SK_GUARDED_BY(fSpinLock);
88 size_t fSizeBudget SK_GUARDED_BY(fSpinLock);
89 size_t fCurrentSize SK_GUARDED_BY(fSpinLock) {0};
90
91 // In practice 'messageBusID' is always the unique ID of the owning GrContext
92 const uint32_t fMessageBusID;
93 SkMessageBus<PurgeBlobMessage>::Inbox fPurgeBlobInbox SK_GUARDED_BY(fSpinLock);
94};
95
96#endif
97