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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_GLOBAL_CONTEXT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_GLOBAL_CONTEXT_H_
#include "base/containers/lru_cache.h"
#include "base/types/pass_key.h"
#include "third_party/blink/public/common/privacy_budget/identifiable_token.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/shaping/harfbuzz_font_cache.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/text/layout_locale.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
#include "third_party/skia/include/core/SkTypeface.h"
namespace blink {
class FontCache;
class FontUniqueNameLookup;
class HarfBuzzFontCache;
// FontGlobalContext contains non-thread-safe, thread-specific data used for
// font formatting.
class PLATFORM_EXPORT FontGlobalContext
: public GarbageCollected<FontGlobalContext> {
public:
using PassKey = base::PassKey<FontGlobalContext>;
explicit FontGlobalContext(PassKey);
~FontGlobalContext();
static FontGlobalContext& Get();
static FontGlobalContext* TryGet();
void Trace(Visitor* visitor) const {
visitor->Trace(font_cache_);
visitor->Trace(harfbuzz_font_cache_);
}
FontGlobalContext(const FontGlobalContext&) = delete;
FontGlobalContext& operator=(const FontGlobalContext&) = delete;
static inline FontCache& GetFontCache() { return Get().font_cache_; }
static HarfBuzzFontCache& GetHarfBuzzFontCache() {
return Get().harfbuzz_font_cache_;
}
static FontUniqueNameLookup* GetFontUniqueNameLookup();
IdentifiableToken GetOrComputeTypefaceDigest(const FontPlatformData& source);
IdentifiableToken GetOrComputePostScriptNameDigest(
const FontPlatformData& source);
// Called by MemoryPressureListenerRegistry to clear memory.
static void ClearMemory();
// |Init()| should be called in main thread.
static void Init();
private:
FontCache font_cache_;
HarfBuzzFontCache harfbuzz_font_cache_;
std::unique_ptr<FontUniqueNameLookup> font_unique_name_lookup_;
base::HashingLRUCache<SkTypefaceID, IdentifiableToken> typeface_digest_cache_;
base::HashingLRUCache<SkTypefaceID, IdentifiableToken>
postscript_name_digest_cache_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_GLOBAL_CONTEXT_H_
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