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81 lines
1.9 KiB
81 lines
1.9 KiB
4 months ago
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// Copyright 2019 Google LLC.
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#ifndef ParagraphCache_DEFINED
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#define ParagraphCache_DEFINED
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#include "include/private/SkMutex.h"
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#include "src/core/SkLRUCache.h"
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#include <functional> // std::function
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#define PARAGRAPH_CACHE_STATS
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namespace skia {
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namespace textlayout {
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enum InternalState {
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kUnknown = 0,
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kShaped = 2,
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kClusterized = 3,
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kMarked = 4,
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kLineBroken = 5,
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kFormatted = 6,
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kDrawn = 7
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};
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class ParagraphImpl;
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class ParagraphCacheKey;
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class ParagraphCacheValue;
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bool operator==(const ParagraphCacheKey& a, const ParagraphCacheKey& b);
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class ParagraphCache {
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public:
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ParagraphCache();
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~ParagraphCache();
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void abandon();
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void reset();
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bool updateParagraph(ParagraphImpl* paragraph);
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bool findParagraph(ParagraphImpl* paragraph);
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// For testing
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void setChecker(std::function<void(ParagraphImpl* impl, const char*, bool)> checker) {
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fChecker = std::move(checker);
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}
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void printStatistics();
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void turnOn(bool value) { fCacheIsOn = value; }
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int count() { return fLRUCacheMap.count(); }
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bool isPossiblyTextEditing(ParagraphImpl* paragraph);
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private:
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struct Entry;
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void updateFrom(const ParagraphImpl* paragraph, Entry* entry);
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void updateTo(ParagraphImpl* paragraph, const Entry* entry);
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mutable SkMutex fParagraphMutex;
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std::function<void(ParagraphImpl* impl, const char*, bool)> fChecker;
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static const int kMaxEntries = 128;
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struct KeyHash {
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uint32_t mix(uint32_t hash, uint32_t data) const;
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uint32_t operator()(const ParagraphCacheKey& key) const;
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};
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SkLRUCache<ParagraphCacheKey, std::unique_ptr<Entry>, KeyHash> fLRUCacheMap;
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bool fCacheIsOn;
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ParagraphCacheValue* fLastCachedValue;
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#ifdef PARAGRAPH_CACHE_STATS
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int fTotalRequests;
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int fCacheMisses;
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int fHashMisses; // cache hit but hash table missed
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#endif
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};
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} // namespace textlayout
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} // namespace skia
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#endif // ParagraphCache_DEFINED
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