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