blob: 45652ae79912cf615b9b4ae870c636aa2a86330f [file] [log] [blame]
// Copyright 2019 Google LLC.
#ifndef ParagraphCache_DEFINED
#define ParagraphCache_DEFINED
#include "include/private/base/SkMutex.h"
#include "src/core/SkLRUCache.h"
#include <functional> // std::function
#define PARAGRAPH_CACHE_STATS
namespace skia {
namespace textlayout {
class ParagraphImpl;
class ParagraphCacheKey;
class ParagraphCacheValue;
class ParagraphCache {
public:
ParagraphCache();
~ParagraphCache();
void abandon();
void reset();
bool updateParagraph(ParagraphImpl* paragraph);
bool findParagraph(ParagraphImpl* paragraph);
// For testing
void setChecker(std::function<void(ParagraphImpl* impl, const char*, bool)> checker) {
fChecker = std::move(checker);
}
void printStatistics();
void turnOn(bool value) { fCacheIsOn = value; }
int count() { return fLRUCacheMap.count(); }
bool isPossiblyTextEditing(ParagraphImpl* paragraph);
private:
struct Entry;
void updateFrom(const ParagraphImpl* paragraph, Entry* entry);
void updateTo(ParagraphImpl* paragraph, const Entry* entry);
mutable SkMutex fParagraphMutex;
std::function<void(ParagraphImpl* impl, const char*, bool)> fChecker;
static const int kMaxEntries = 128;
struct KeyHash {
uint32_t operator()(const ParagraphCacheKey& key) const;
};
SkLRUCache<ParagraphCacheKey, std::unique_ptr<Entry>, KeyHash> fLRUCacheMap;
bool fCacheIsOn;
ParagraphCacheValue* fLastCachedValue;
#ifdef PARAGRAPH_CACHE_STATS
int fTotalRequests;
int fCacheMisses;
int fHashMisses; // cache hit but hash table missed
#endif
};
} // namespace textlayout
} // namespace skia
#endif // ParagraphCache_DEFINED