asset_font_manager.h

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/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef TXT_ASSET_FONT_MANAGER_H_
#define TXT_ASSET_FONT_MANAGER_H_
 
#include <memory>
#include <utility>
 
#include "flutter/fml/macros.h"
#include "third_party/skia/include/core/SkFontMgr.h"
#include "third_party/skia/include/core/SkStream.h"
#include "txt/font_asset_provider.h"
#include "txt/typeface_font_asset_provider.h"
 
namespace txt {
 
class AssetFontManager : public SkFontMgr {
 public:
  explicit AssetFontManager(std::unique_ptr<FontAssetProvider> font_provider);
 
  ~AssetFontManager() override;
 
 protected:
  // |SkFontMgr|
  sk_sp<SkFontStyleSet> onMatchFamily(const char familyName[]) const override;
 
  std::unique_ptr<FontAssetProvider> font_provider_;
 
 private:
  // |SkFontMgr|
  int onCountFamilies() const override;
 
  // |SkFontMgr|
  void onGetFamilyName(int index, SkString* familyName) const override;
 
  // |SkFontMgr|
  sk_sp<SkFontStyleSet> onCreateStyleSet(int index) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMatchFamilyStyle(const char familyName[],
                                       const SkFontStyle&) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMatchFamilyStyleCharacter(
      const char familyName[],
      const SkFontStyle&,
      const char* bcp47[],
      int bcp47Count,
      SkUnichar character) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>,
                                          int ttcIndex) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>,
                                         const SkFontArguments&) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onMakeFromFile(const char path[],
                                   int ttcIndex) const override;
 
  // |SkFontMgr|
  sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[],
                                         SkFontStyle) const override;
 
  FML_DISALLOW_COPY_AND_ASSIGN(AssetFontManager);
};
 
class DynamicFontManager : public AssetFontManager {
 public:
  DynamicFontManager()
      : AssetFontManager(std::make_unique<TypefaceFontAssetProvider>()) {}
 
  TypefaceFontAssetProvider& font_provider() const {
    return static_cast<TypefaceFontAssetProvider&>(*font_provider_);
  }
};
 
}  // namespace txt
 
#endif  // TXT_ASSET_FONT_MANAGER_H_