| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/lib/ui/text/asset_manager_font_provider.h" |
| |
| #include "flutter/fml/logging.h" |
| #include "third_party/skia/include/core/SkData.h" |
| #include "third_party/skia/include/core/SkStream.h" |
| #include "third_party/skia/include/core/SkString.h" |
| #include "third_party/skia/include/core/SkTypeface.h" |
| |
| namespace flutter { |
| |
| namespace { |
| |
| void MappingReleaseProc(const void* ptr, void* context) { |
| delete reinterpret_cast<fml::Mapping*>(context); |
| } |
| |
| } // anonymous namespace |
| |
| AssetManagerFontProvider::AssetManagerFontProvider( |
| std::shared_ptr<AssetManager> asset_manager) |
| : asset_manager_(asset_manager) {} |
| |
| AssetManagerFontProvider::~AssetManagerFontProvider() = default; |
| |
| // |FontAssetProvider| |
| size_t AssetManagerFontProvider::GetFamilyCount() const { |
| return family_names_.size(); |
| } |
| |
| // |FontAssetProvider| |
| std::string AssetManagerFontProvider::GetFamilyName(int index) const { |
| FML_DCHECK(index >= 0 && static_cast<size_t>(index) < family_names_.size()); |
| return family_names_[index]; |
| } |
| |
| // |FontAssetProvider| |
| SkFontStyleSet* AssetManagerFontProvider::MatchFamily( |
| const std::string& family_name) { |
| auto found = registered_families_.find(CanonicalFamilyName(family_name)); |
| if (found == registered_families_.end()) { |
| return nullptr; |
| } |
| sk_sp<SkFontStyleSet> font_style_set = found->second; |
| return font_style_set.release(); |
| } |
| |
| void AssetManagerFontProvider::RegisterAsset(std::string family_name, |
| std::string asset) { |
| std::string canonical_name = CanonicalFamilyName(family_name); |
| auto family_it = registered_families_.find(canonical_name); |
| |
| if (family_it == registered_families_.end()) { |
| family_names_.push_back(family_name); |
| auto value = std::make_pair( |
| canonical_name, |
| sk_make_sp<AssetManagerFontStyleSet>(asset_manager_, family_name)); |
| family_it = registered_families_.emplace(value).first; |
| } |
| |
| family_it->second->registerAsset(asset); |
| } |
| |
| AssetManagerFontStyleSet::AssetManagerFontStyleSet( |
| std::shared_ptr<AssetManager> asset_manager, |
| std::string family_name) |
| : asset_manager_(asset_manager), family_name_(family_name) {} |
| |
| AssetManagerFontStyleSet::~AssetManagerFontStyleSet() = default; |
| |
| void AssetManagerFontStyleSet::registerAsset(std::string asset) { |
| assets_.emplace_back(asset); |
| } |
| |
| int AssetManagerFontStyleSet::count() { |
| return assets_.size(); |
| } |
| |
| void AssetManagerFontStyleSet::getStyle(int index, |
| SkFontStyle* style, |
| SkString* name) { |
| FML_DCHECK(index < static_cast<int>(assets_.size())); |
| if (style) { |
| sk_sp<SkTypeface> typeface(createTypeface(index)); |
| if (typeface) { |
| *style = typeface->fontStyle(); |
| } |
| } |
| if (name) { |
| *name = family_name_.c_str(); |
| } |
| } |
| |
| SkTypeface* AssetManagerFontStyleSet::createTypeface(int i) { |
| size_t index = i; |
| if (index >= assets_.size()) { |
| return nullptr; |
| } |
| |
| TypefaceAsset& asset = assets_[index]; |
| if (!asset.typeface) { |
| std::unique_ptr<fml::Mapping> asset_mapping = |
| asset_manager_->GetAsMapping(asset.asset); |
| if (asset_mapping == nullptr) { |
| return nullptr; |
| } |
| |
| fml::Mapping* asset_mapping_ptr = asset_mapping.release(); |
| sk_sp<SkData> asset_data = SkData::MakeWithProc( |
| asset_mapping_ptr->GetMapping(), asset_mapping_ptr->GetSize(), |
| MappingReleaseProc, asset_mapping_ptr); |
| std::unique_ptr<SkMemoryStream> stream = SkMemoryStream::Make(asset_data); |
| |
| // Ownership of the stream is transferred. |
| asset.typeface = SkTypeface::MakeFromStream(std::move(stream)); |
| if (!asset.typeface) { |
| FML_DLOG(ERROR) << "Unable to load font asset for family: " |
| << family_name_; |
| return nullptr; |
| } |
| } |
| |
| return SkRef(asset.typeface.get()); |
| } |
| |
| SkTypeface* AssetManagerFontStyleSet::matchStyle(const SkFontStyle& pattern) { |
| return matchStyleCSS3(pattern); |
| } |
| |
| AssetManagerFontStyleSet::TypefaceAsset::TypefaceAsset(std::string a) |
| : asset(std::move(a)) {} |
| |
| AssetManagerFontStyleSet::TypefaceAsset::TypefaceAsset( |
| const AssetManagerFontStyleSet::TypefaceAsset& other) = default; |
| |
| AssetManagerFontStyleSet::TypefaceAsset::~TypefaceAsset() = default; |
| |
| } // namespace flutter |