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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CanvasFontCache_h
#define CanvasFontCache_h
#include "core/CoreExport.h"
#include "core/css/StylePropertySet.h"
#include "platform/fonts/Font.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebThread.h"
#include "wtf/HashMap.h"
#include "wtf/ListHashSet.h"
#include "wtf/text/WTFString.h"
#include <memory>
namespace blink {
class ComputedStyle;
class Document;
class FontCachePurgePreventer;
class CORE_EXPORT CanvasFontCache final
: public GarbageCollectedFinalized<CanvasFontCache>,
public WebThread::TaskObserver {
public:
static CanvasFontCache* create(Document& document) {
return new CanvasFontCache(document);
}
MutableStylePropertySet* parseFont(const String&);
void pruneAll();
unsigned size();
DECLARE_VIRTUAL_TRACE();
static unsigned maxFonts();
unsigned hardMaxFonts();
void willUseCurrentFont() { schedulePruningIfNeeded(); }
bool getFontUsingDefaultStyle(const String&, Font&);
// TaskObserver implementation
void didProcessTask() override;
void willProcessTask() override {}
// For testing
bool isInCache(const String&);
~CanvasFontCache();
private:
explicit CanvasFontCache(Document&);
void schedulePruningIfNeeded();
typedef HeapHashMap<String, Member<MutableStylePropertySet>>
MutableStylePropertyMap;
HashMap<String, Font> m_fontsResolvedUsingDefaultStyle;
MutableStylePropertyMap m_fetchedFonts;
ListHashSet<String> m_fontLRUList;
std::unique_ptr<FontCachePurgePreventer> m_mainCachePurgePreventer;
Member<Document> m_document;
RefPtr<ComputedStyle> m_defaultFontStyle;
bool m_pruningScheduled;
};
} // namespace blink
#endif
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