| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkFontConfigInterface.h" |
| #include "SkFontConfigTypeface.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontMgr.h" |
| #include "SkFontMgr_FontConfigInterface.h" |
| #include "SkFontStyle.h" |
| #include "SkMakeUnique.h" |
| #include "SkMutex.h" |
| #include "SkString.h" |
| #include "SkTypeface.h" |
| #include "SkTypefaceCache.h" |
| #include "SkResourceCache.h" |
| |
| SkStreamAsset* SkTypeface_FCI::onOpenStream(int* ttcIndex) const { |
| *ttcIndex = this->getIdentity().fTTCIndex; |
| |
| if (fFontData) { |
| SkStreamAsset* stream = fFontData->getStream(); |
| if (!stream) { |
| return nullptr; |
| } |
| return stream->duplicate(); |
| } |
| |
| return fFCI->openStream(this->getIdentity()); |
| } |
| |
| std::unique_ptr<SkFontData> SkTypeface_FCI::onMakeFontData() const { |
| if (fFontData) { |
| return skstd::make_unique<SkFontData>(*fFontData); |
| } |
| |
| const SkFontConfigInterface::FontIdentity& id = this->getIdentity(); |
| return skstd::make_unique<SkFontData>(std::unique_ptr<SkStreamAsset>(fFCI->openStream(id)), |
| id.fTTCIndex, nullptr, 0); |
| } |
| |
| void SkTypeface_FCI::onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocalStream) const { |
| SkString name; |
| this->getFamilyName(&name); |
| desc->setFamilyName(name.c_str()); |
| desc->setStyle(this->fontStyle()); |
| *isLocalStream = SkToBool(fFontData); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkFontStyleSet_FCI : public SkFontStyleSet { |
| public: |
| SkFontStyleSet_FCI() {} |
| |
| int count() override { return 0; } |
| void getStyle(int index, SkFontStyle*, SkString* style) override { SkASSERT(false); } |
| SkTypeface* createTypeface(int index) override { SkASSERT(false); return nullptr; } |
| SkTypeface* matchStyle(const SkFontStyle& pattern) override { return nullptr; } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkFontRequestCache { |
| public: |
| struct Request : public SkResourceCache::Key { |
| private: |
| Request(const char* name, size_t nameLen, const SkFontStyle& style) : fStyle(style) { |
| /** Pointer to just after the last field of this class. */ |
| char* content = const_cast<char*>(SkTAfter<const char>(&this->fStyle)); |
| |
| // No holes. |
| SkASSERT(SkTAddOffset<char>(this, sizeof(SkResourceCache::Key) + keySize) == content); |
| |
| // Has a size divisible by size of uint32_t. |
| SkASSERT((content - reinterpret_cast<char*>(this)) % sizeof(uint32_t) == 0); |
| |
| size_t contentLen = SkAlign4(nameLen); |
| sk_careful_memcpy(content, name, nameLen); |
| sk_bzero(content + nameLen, contentLen - nameLen); |
| this->init(nullptr, 0, keySize + contentLen); |
| } |
| const SkFontStyle fStyle; |
| /** The sum of the sizes of the fields of this class. */ |
| static const size_t keySize = sizeof(fStyle); |
| |
| public: |
| static Request* Create(const char* name, const SkFontStyle& style) { |
| size_t nameLen = name ? strlen(name) : 0; |
| size_t contentLen = SkAlign4(nameLen); |
| char* storage = new char[sizeof(Request) + contentLen]; |
| return new (storage) Request(name, nameLen, style); |
| } |
| void operator delete(void* storage) { |
| delete[] reinterpret_cast<char*>(storage); |
| } |
| }; |
| |
| |
| private: |
| struct Result : public SkResourceCache::Rec { |
| Result(Request* request, SkTypeface* typeface) |
| : fRequest(request) |
| , fFace(SkSafeRef(typeface)) {} |
| Result(Result&&) = default; |
| Result& operator=(Result&&) = default; |
| |
| const Key& getKey() const override { return *fRequest; } |
| size_t bytesUsed() const override { return fRequest->size() + sizeof(fFace); } |
| const char* getCategory() const override { return "request_cache"; } |
| SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; } |
| |
| std::unique_ptr<Request> fRequest; |
| sk_sp<SkTypeface> fFace; |
| }; |
| |
| SkResourceCache fCachedResults; |
| |
| public: |
| SkFontRequestCache(size_t maxSize) : fCachedResults(maxSize) {} |
| |
| /** Takes ownership of request. It will be deleted when no longer needed. */ |
| void add(SkTypeface* face, Request* request) { |
| fCachedResults.add(new Result(request, face)); |
| } |
| /** Does not take ownership of request. */ |
| SkTypeface* findAndRef(Request* request) { |
| SkTypeface* face = nullptr; |
| fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool { |
| const Result& result = static_cast<const Result&>(rec); |
| SkTypeface** face = static_cast<SkTypeface**>(context); |
| |
| *face = result.fFace.get(); |
| return true; |
| }, &face); |
| return SkSafeRef(face); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) { |
| typedef SkFontConfigInterface::FontIdentity FontIdentity; |
| SkTypeface_FCI* cachedFCTypeface = static_cast<SkTypeface_FCI*>(cachedTypeface); |
| FontIdentity* identity = static_cast<FontIdentity*>(ctx); |
| |
| return cachedFCTypeface->getIdentity() == *identity; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkFontMgr_FCI : public SkFontMgr { |
| sk_sp<SkFontConfigInterface> fFCI; |
| SkTypeface_FreeType::Scanner fScanner; |
| |
| mutable SkMutex fMutex; |
| mutable SkTypefaceCache fTFCache; |
| |
| // The value of maxSize here is a compromise between cache hits and cache size. |
| // See https://crbug.com/424082#63 for reason for current size. |
| static const size_t kMaxSize = 1 << 15; |
| mutable SkFontRequestCache fCache; |
| |
| public: |
| SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci) |
| : fFCI(std::move(fci)) |
| , fCache(kMaxSize) |
| {} |
| |
| protected: |
| int onCountFamilies() const override { |
| return 0; |
| } |
| |
| void onGetFamilyName(int index, SkString* familyName) const override { |
| SK_ABORT("Not implemented."); |
| } |
| |
| SkFontStyleSet* onCreateStyleSet(int index) const override { |
| SK_ABORT("Not implemented."); |
| return nullptr; |
| } |
| |
| SkFontStyleSet* onMatchFamily(const char familyName[]) const override { |
| return new SkFontStyleSet_FCI(); |
| } |
| |
| SkTypeface* onMatchFamilyStyle(const char familyName[], |
| const SkFontStyle&) const override { return nullptr; } |
| SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&, |
| const char* bcp47[], int bcp47Count, |
| SkUnichar character) const override { |
| return nullptr; |
| } |
| SkTypeface* onMatchFaceStyle(const SkTypeface*, |
| const SkFontStyle&) const override { return nullptr; } |
| |
| SkTypeface* onCreateFromData(SkData*, int ttcIndex) const override { return nullptr; } |
| |
| SkTypeface* onCreateFromStream(SkStreamAsset* bareStream, int ttcIndex) const override { |
| std::unique_ptr<SkStreamAsset> stream(bareStream); |
| const size_t length = stream->getLength(); |
| if (!length) { |
| return nullptr; |
| } |
| if (length >= 1024 * 1024 * 1024) { |
| return nullptr; // don't accept too large fonts (>= 1GB) for safety. |
| } |
| |
| // TODO should the caller give us the style or should we get it from freetype? |
| SkString name; |
| SkFontStyle style; |
| bool isFixedPitch = false; |
| if (!fScanner.scanFont(stream.get(), 0, &name, &style, &isFixedPitch, nullptr)) { |
| return nullptr; |
| } |
| |
| auto fontData = skstd::make_unique<SkFontData>(std::move(stream), ttcIndex, nullptr, 0); |
| return SkTypeface_FCI::Create(std::move(fontData), std::move(name), style, isFixedPitch); |
| } |
| |
| SkTypeface* onCreateFromStream(SkStreamAsset* s, const SkFontArguments& args) const override { |
| using Scanner = SkTypeface_FreeType::Scanner; |
| std::unique_ptr<SkStreamAsset> stream(s); |
| const size_t length = stream->getLength(); |
| if (!length) { |
| return nullptr; |
| } |
| if (length >= 1024 * 1024 * 1024) { |
| return nullptr; // don't accept too large fonts (>= 1GB) for safety. |
| } |
| |
| bool isFixedPitch; |
| SkFontStyle style; |
| SkString name; |
| Scanner::AxisDefinitions axisDefinitions; |
| if (!fScanner.scanFont(stream.get(), args.getCollectionIndex(), |
| &name, &style, &isFixedPitch, &axisDefinitions)) |
| { |
| return nullptr; |
| } |
| |
| SkAutoSTMalloc<4, SkFixed> axisValues(axisDefinitions.count()); |
| Scanner::computeAxisValues(axisDefinitions, args.getVariationDesignPosition(), |
| axisValues, name); |
| |
| auto fontData = skstd::make_unique<SkFontData>(std::move(stream), |
| args.getCollectionIndex(), |
| axisValues.get(), |
| axisDefinitions.count()); |
| return SkTypeface_FCI::Create(std::move(fontData), std::move(name), style, isFixedPitch); |
| } |
| |
| SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override { |
| std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path); |
| return stream.get() ? this->createFromStream(stream.release(), ttcIndex) : nullptr; |
| } |
| |
| SkTypeface* onLegacyCreateTypeface(const char requestedFamilyName[], |
| SkFontStyle requestedStyle) const override |
| { |
| SkAutoMutexAcquire ama(fMutex); |
| |
| // Check if this request is already in the request cache. |
| using Request = SkFontRequestCache::Request; |
| std::unique_ptr<Request> request(Request::Create(requestedFamilyName, requestedStyle)); |
| SkTypeface* face = fCache.findAndRef(request.get()); |
| if (face) { |
| return face; |
| } |
| |
| SkFontConfigInterface::FontIdentity identity; |
| SkString outFamilyName; |
| SkFontStyle outStyle; |
| if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle, |
| &identity, &outFamilyName, &outStyle)) |
| { |
| return nullptr; |
| } |
| |
| // Check if a typeface with this FontIdentity is already in the FontIdentity cache. |
| face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity); |
| if (!face) { |
| face = SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle); |
| // Add this FontIdentity to the FontIdentity cache. |
| fTFCache.add(face); |
| } |
| // Add this request to the request cache. |
| fCache.add(face, request.release()); |
| |
| return face; |
| } |
| }; |
| |
| SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci) { |
| SkASSERT(fci); |
| return sk_make_sp<SkFontMgr_FCI>(std::move(fci)); |
| } |