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/*
* 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"
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
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);
return cachedFCTypeface->getIdentity() == *identity;
}
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;
}
///////////////////////////////////////////////////////////////////////////////
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());
}
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