// 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/memory_coordinator/memory_consumer.h"
#include "base/types/pass_key.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/heap/prefinalizer.h"
#include "third_party/blink/renderer/platform/instrumentation/memory_coordinator/memory_consumer_registration.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 base::MemoryConsumer {
  USING_PRE_FINALIZER(FontGlobalContext, Dispose);

 public:
  using PassKey = base::PassKey<FontGlobalContext>;
  explicit FontGlobalContext(PassKey);
  ~FontGlobalContext() override;

  void Dispose();

  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();

  // |Init()| should be called in main thread.
  static void Init();

  // base::MemoryConsumer:
  void OnUpdateMemoryLimit() override;
  void OnReleaseMemory() override;

 private:
  FontCache font_cache_;
  HarfBuzzFontCache harfbuzz_font_cache_;
  std::unique_ptr<FontUniqueNameLookup> font_unique_name_lookup_;

  MemoryConsumerRegistration memory_consumer_registration_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_GLOBAL_CONTEXT_H_