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- /*
- * 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 "include/core/SkFontMgr.h"
- #include "include/core/SkFontStyle.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTypeface.h"
- #include "include/ports/SkFontConfigInterface.h"
- #include "include/ports/SkFontMgr_FontConfigInterface.h"
- #include "include/private/SkMutex.h"
- #include "src/core/SkFontDescriptor.h"
- #include "src/core/SkMakeUnique.h"
- #include "src/core/SkResourceCache.h"
- #include "src/core/SkTypefaceCache.h"
- #include "src/ports/SkFontConfigTypeface.h"
- #include <new>
- std::unique_ptr<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 std::unique_ptr<SkStreamAsset>(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, sk_sp<SkTypeface> typeface)
- : fRequest(request), fFace(std::move(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(sk_sp<SkTypeface> face, Request* request) {
- fCachedResults.add(new Result(request, std::move(face)));
- }
- /** Does not take ownership of request. */
- sk_sp<SkTypeface> findAndRef(Request* request) {
- sk_sp<SkTypeface> face;
- fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool {
- const Result& result = static_cast<const Result&>(rec);
- sk_sp<SkTypeface>* face = static_cast<sk_sp<SkTypeface>*>(context);
- *face = result.fFace;
- return true;
- }, &face);
- return 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 {
- SK_ABORT("Not implemented.");
- 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 {
- SK_ABORT("Not implemented.");
- return new SkFontStyleSet_FCI();
- }
- SkTypeface* onMatchFamilyStyle(const char requestedFamilyName[],
- const SkFontStyle& requestedStyle) const override
- {
- SkAutoMutexExclusive ama(fMutex);
- 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.
- sk_sp<SkTypeface> face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
- if (!face) {
- face.reset(SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle));
- // Add this FontIdentity to the FontIdentity cache.
- fTFCache.add(face);
- }
- return face.release();
- }
- SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
- const char* bcp47[], int bcp47Count,
- SkUnichar character) const override {
- SK_ABORT("Not implemented.");
- return nullptr;
- }
- SkTypeface* onMatchFaceStyle(const SkTypeface*, const SkFontStyle&) const override {
- SK_ABORT("Not implemented.");
- return nullptr;
- }
- sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData> data, int ttcIndex) const override {
- return this->onMakeFromStreamIndex(SkMemoryStream::Make(std::move(data)), ttcIndex);
- }
- sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,
- int ttcIndex) const override {
- 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 sk_sp<SkTypeface>(SkTypeface_FCI::Create(std::move(fontData), std::move(name),
- style, isFixedPitch));
- }
- sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
- const SkFontArguments& args) const override {
- using Scanner = SkTypeface_FreeType::Scanner;
- 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 sk_sp<SkTypeface>(SkTypeface_FCI::Create(std::move(fontData), std::move(name),
- style, isFixedPitch));
- }
- sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
- std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path);
- return stream ? this->makeFromStream(std::move(stream), ttcIndex) : nullptr;
- }
- sk_sp<SkTypeface> onLegacyMakeTypeface(const char requestedFamilyName[],
- SkFontStyle requestedStyle) const override
- {
- SkAutoMutexExclusive 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));
- sk_sp<SkTypeface> face = fCache.findAndRef(request.get());
- if (face) {
- return sk_sp<SkTypeface>(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.reset(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));
- }
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