Clean up SkFontConfigInterface implementation.

src/ports/SkFontHost_fontconfig.cpp

 /*
  * Copyright 2008 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 "SkStream.h"
-#include "SkTemplates.h"
-#include "SkTypeface.h"
-#include "SkTypefaceCache.h"
-#include "SkResourceCache.h"
-
-///////////////////////////////////////////////////////////////////////////////
-///////////////////////////////////////////////////////////////////////////////
+#include "SkFontMgr.h"
+#include "SkMutex.h"
+#include "SkRefCnt.h"
 
 SK_DECLARE_STATIC_MUTEX(gFontConfigInterfaceMutex);
 static SkFontConfigInterface* gFontConfigInterface;
 
 SkFontConfigInterface* SkFontConfigInterface::RefGlobal() {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);
 
     return SkSafeRef(gFontConfigInterface);
 }
 
 SkFontConfigInterface* SkFontConfigInterface::SetGlobal(SkFontConfigInterface* fc) {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);
 
     SkRefCnt_SafeAssign(gFontConfigInterface, fc);
     return fc;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
-///////////////////////////////////////////////////////////////////////////////
-
-// convenience function to create the direct interface if none is installed.
-extern SkFontConfigInterface* SkCreateDirectFontConfigInterface();
-
-static SkFontConfigInterface* RefFCI() {
-    for (;;) {
-        SkFontConfigInterface* fci = SkFontConfigInterface::RefGlobal();
-        if (fci) {
-            return fci;
-        }
-        fci = SkFontConfigInterface::GetSingletonDirectInterface(&gFontConfigInterfaceMutex);
-        SkFontConfigInterface::SetGlobal(fci);
-    }
-}
-
-// export this to SkFontMgr_fontconfig.cpp until this file just goes away.
-SkFontConfigInterface* SkFontHost_fontconfig_ref_global();
-SkFontConfigInterface* SkFontHost_fontconfig_ref_global() {
-    return RefFCI();
-}
-
-///////////////////////////////////////////////////////////////////////////////
 
-static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) {
-    typedef SkFontConfigInterface::FontIdentity FontIdentity;
-    FontConfigTypeface* cachedFCTypeface = static_cast<FontConfigTypeface*>(cachedTypeface);
-    FontIdentity* identity = static_cast<FontIdentity*>(ctx);
+static SkFontConfigInterface* init_FCI() {
+    SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);
 
-    return cachedFCTypeface->getIdentity() == *identity;
+    if (gFontConfigInterface) {
+        return SkRef(gFontConfigInterface);
+    }
+    gFontConfigInterface = SkRef(SkFontConfigInterface::GetSingletonDirectInterface());
+    return gFontConfigInterface;
 }
 
-SK_DECLARE_STATIC_MUTEX(gSkFontHostRequestCacheMutex);
-class SkFontHostRequestCache {
-
-    // 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 gMaxSize = 1 << 15;
-
-    static SkFontHostRequestCache& Get() {
-        gSkFontHostRequestCacheMutex.assertHeld();
-        static SkFontHostRequestCache gCache(gMaxSize);
-        return gCache;
-    }
-
-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(&gSkFontHostRequestCacheMutex, 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; }
-
-        SkAutoTDelete<Request> fRequest;
-        SkAutoTUnref<SkTypeface> fFace;
-    };
-
-    SkResourceCache fCachedResults;
-
-public:
-    SkFontHostRequestCache(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;
-            return true;
-        }, &face);
-        return SkSafeRef(face);
-    }
-
-    /** Takes ownership of request. It will be deleted when no longer needed. */
-    static void Add(SkTypeface* face, Request* request) {
-        SkAutoMutexAcquire ama(gSkFontHostRequestCacheMutex);
-        Get().add(face, request);
-    }
-
-    /** Does not take ownership of request. */
-    static SkTypeface* FindAndRef(Request* request) {
-        SkAutoMutexAcquire ama(gSkFontHostRequestCacheMutex);
-        return Get().findAndRef(request);
-    }
-};
-
-SkTypeface* FontConfigTypeface::LegacyCreateTypeface(const char requestedFamilyName[],
-                                                     SkFontStyle requestedStyle)
-{
-    SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
-    if (nullptr == fci.get()) {
-        return nullptr;
-    }
-
-    // Check if this request is already in the request cache.
-    using Request = SkFontHostRequestCache::Request;
-    SkAutoTDelete<Request> request(Request::Create(requestedFamilyName, requestedStyle));
-    SkTypeface* face = SkFontHostRequestCache::FindAndRef(request);
-    if (face) {
-        return face;
-    }
-
-    SkFontConfigInterface::FontIdentity identity;
-    SkString outFamilyName;
-    SkFontStyle outStyle;
-    if (!fci->matchFamilyName(requestedFamilyName, requestedStyle,
-                              &identity, &outFamilyName, &outStyle))
-    {
-        return nullptr;
-    }
-
-    // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
-    face = SkTypefaceCache::FindByProcAndRef(find_by_FontIdentity, &identity);
-    if (!face) {
-        face = FontConfigTypeface::Create(outStyle, identity, outFamilyName);
-        // Add this FontIdentity to the FontIdentity cache.
-        SkTypefaceCache::Add(face);
-    }
-    // Add this request to the request cache.
-    SkFontHostRequestCache::Add(face, request.release());
-
-    return face;
+SkFontMgr* SkFontMgr::Factory() {
+    SkFontConfigInterface* fci = init_FCI();
+    return fci ? SkFontMgr_New_FCI(fci) : nullptr;
 }
-
-///////////////////////////////////////////////////////////////////////////////
-
-SkStreamAsset* FontConfigTypeface::onOpenStream(int* ttcIndex) const {
-    SkStreamAsset* stream = this->getLocalStream();
-    if (stream) {
-        // TODO: should have been provided by CreateFromStream()
-        *ttcIndex = 0;
-        return stream->duplicate();
-    }
-
-    SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
-    if (nullptr == fci.get()) {
-        return nullptr;
-    }
-
-    *ttcIndex = this->getIdentity().fTTCIndex;
-    return fci->openStream(this->getIdentity());
-}
-
-void FontConfigTypeface::onGetFamilyName(SkString* familyName) const {
-    *familyName = fFamilyName;
-}
-
-void FontConfigTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
-                                             bool* isLocalStream) const {
-    SkString name;
-    this->getFamilyName(&name);
-    desc->setFamilyName(name.c_str());
-    *isLocalStream = SkToBool(this->getLocalStream());
-}