1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/core/SkFontMgr.h"
9 #include "include/core/SkFontStyle.h"
10 #include "include/core/SkString.h"
11 #include "include/core/SkTypeface.h"
12 #include "include/ports/SkFontConfigInterface.h"
13 #include "include/ports/SkFontMgr_FontConfigInterface.h"
14 #include "include/private/base/SkMutex.h"
15 #include "src/core/SkFontDescriptor.h"
16 #include "src/core/SkResourceCache.h"
17 #include "src/core/SkTypefaceCache.h"
18 #include "src/ports/SkFontConfigTypeface.h"
19 #include "src/ports/SkTypeface_FreeType.h"
20
21 #include <new>
22
23 using namespace skia_private;
24
onOpenStream(int * ttcIndex) const25 std::unique_ptr<SkStreamAsset> SkTypeface_FCI::onOpenStream(int* ttcIndex) const {
26 *ttcIndex = this->getIdentity().fTTCIndex;
27 return std::unique_ptr<SkStreamAsset>(fFCI->openStream(this->getIdentity()));
28 }
29
onMakeFontData() const30 std::unique_ptr<SkFontData> SkTypeface_FCI::onMakeFontData() const {
31 const SkFontConfigInterface::FontIdentity& id = this->getIdentity();
32 return std::make_unique<SkFontData>(std::unique_ptr<SkStreamAsset>(fFCI->openStream(id)),
33 id.fTTCIndex, 0, nullptr, 0, nullptr, 0);
34 }
35
onGetFontDescriptor(SkFontDescriptor * desc,bool * serialize) const36 void SkTypeface_FCI::onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const {
37 SkString name;
38 this->getFamilyName(&name);
39 desc->setFamilyName(name.c_str());
40 desc->setStyle(this->fontStyle());
41 desc->setFactoryId(SkTypeface_FreeType::FactoryId);
42 *serialize = true;
43 }
44
45 ///////////////////////////////////////////////////////////////////////////////
46
47 class SkFontStyleSet_FCI : public SkFontStyleSet {
48 public:
SkFontStyleSet_FCI()49 SkFontStyleSet_FCI() {}
50
count()51 int count() override { return 0; }
getStyle(int index,SkFontStyle *,SkString * style)52 void getStyle(int index, SkFontStyle*, SkString* style) override { SkASSERT(false); }
createTypeface(int index)53 sk_sp<SkTypeface> createTypeface(int index) override { SkASSERT(false); return nullptr; }
matchStyle(const SkFontStyle & pattern)54 sk_sp<SkTypeface> matchStyle(const SkFontStyle& pattern) override { return nullptr; }
55 };
56
57 ///////////////////////////////////////////////////////////////////////////////
58
59 class SkFontRequestCache {
60 public:
61 struct Request : public SkResourceCache::Key {
62 private:
RequestSkFontRequestCache::Request63 Request(const char* name, size_t nameLen, const SkFontStyle& style) : fStyle(style) {
64 /** Pointer to just after the last field of this class. */
65 char* content = const_cast<char*>(SkTAfter<const char>(&this->fStyle));
66
67 // No holes.
68 SkASSERT(SkTAddOffset<char>(this, sizeof(SkResourceCache::Key) + keySize) == content);
69
70 // Has a size divisible by size of uint32_t.
71 SkASSERT((content - reinterpret_cast<char*>(this)) % sizeof(uint32_t) == 0);
72
73 size_t contentLen = SkAlign4(nameLen);
74 sk_careful_memcpy(content, name, nameLen);
75 sk_bzero(content + nameLen, contentLen - nameLen);
76 this->init(nullptr, 0, keySize + contentLen);
77 }
78 const SkFontStyle fStyle;
79 /** The sum of the sizes of the fields of this class. */
80 static const size_t keySize = sizeof(fStyle);
81
82 public:
CreateSkFontRequestCache::Request83 static Request* Create(const char* name, const SkFontStyle& style) {
84 size_t nameLen = name ? strlen(name) : 0;
85 size_t contentLen = SkAlign4(nameLen);
86 char* storage = new char[sizeof(Request) + contentLen];
87 return new (storage) Request(name, nameLen, style);
88 }
operator deleteSkFontRequestCache::Request89 void operator delete(void* storage) {
90 delete[] reinterpret_cast<char*>(storage);
91 }
92 };
93
94
95 private:
96 struct Result : public SkResourceCache::Rec {
ResultSkFontRequestCache::Result97 Result(Request* request, sk_sp<SkTypeface> typeface)
98 : fRequest(request), fFace(std::move(typeface)) {}
99 Result(Result&&) = default;
100 Result& operator=(Result&&) = default;
101
getKeySkFontRequestCache::Result102 const Key& getKey() const override { return *fRequest; }
bytesUsedSkFontRequestCache::Result103 size_t bytesUsed() const override { return fRequest->size() + sizeof(fFace); }
getCategorySkFontRequestCache::Result104 const char* getCategory() const override { return "request_cache"; }
diagnostic_only_getDiscardableSkFontRequestCache::Result105 SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; }
106
107 std::unique_ptr<Request> fRequest;
108 sk_sp<SkTypeface> fFace;
109 };
110
111 SkResourceCache fCachedResults;
112
113 public:
SkFontRequestCache(size_t maxSize)114 SkFontRequestCache(size_t maxSize) : fCachedResults(maxSize) {}
115
116 /** Takes ownership of request. It will be deleted when no longer needed. */
add(sk_sp<SkTypeface> face,Request * request)117 void add(sk_sp<SkTypeface> face, Request* request) {
118 fCachedResults.add(new Result(request, std::move(face)));
119 }
120 /** Does not take ownership of request. */
findAndRef(Request * request)121 sk_sp<SkTypeface> findAndRef(Request* request) {
122 sk_sp<SkTypeface> face;
123 fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool {
124 const Result& result = static_cast<const Result&>(rec);
125 sk_sp<SkTypeface>* face = static_cast<sk_sp<SkTypeface>*>(context);
126
127 *face = result.fFace;
128 return true;
129 }, &face);
130 return face;
131 }
132 };
133
134 ///////////////////////////////////////////////////////////////////////////////
135
find_by_FontIdentity(SkTypeface * cachedTypeface,void * ctx)136 static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) {
137 typedef SkFontConfigInterface::FontIdentity FontIdentity;
138 SkTypeface_FCI* cachedFCTypeface = static_cast<SkTypeface_FCI*>(cachedTypeface);
139 FontIdentity* identity = static_cast<FontIdentity*>(ctx);
140
141 return cachedFCTypeface->getIdentity() == *identity;
142 }
143
144 ///////////////////////////////////////////////////////////////////////////////
145
146 class SkFontMgr_FCI : public SkFontMgr {
147 sk_sp<SkFontConfigInterface> fFCI;
148
149 mutable SkMutex fMutex;
150 mutable SkTypefaceCache fTFCache;
151
152 // The value of maxSize here is a compromise between cache hits and cache size.
153 // See https://crbug.com/424082#63 for reason for current size.
154 static const size_t kMaxSize = 1 << 15;
155 mutable SkFontRequestCache fCache;
156
157 public:
SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci)158 SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci)
159 : fFCI(std::move(fci))
160 , fCache(kMaxSize)
161 {
162 SkASSERT_RELEASE(fFCI);
163 }
164
165 protected:
onCountFamilies() const166 int onCountFamilies() const override {
167 SK_ABORT("Not implemented.");
168 }
169
onGetFamilyName(int index,SkString * familyName) const170 void onGetFamilyName(int index, SkString* familyName) const override {
171 SK_ABORT("Not implemented.");
172 }
173
onCreateStyleSet(int index) const174 sk_sp<SkFontStyleSet> onCreateStyleSet(int index) const override {
175 SK_ABORT("Not implemented.");
176 }
177
onMatchFamily(const char familyName[]) const178 sk_sp<SkFontStyleSet> onMatchFamily(const char familyName[]) const override {
179 SK_ABORT("Not implemented.");
180 }
181
onMatchFamilyStyle(const char requestedFamilyName[],const SkFontStyle & requestedStyle) const182 sk_sp<SkTypeface> onMatchFamilyStyle(const char requestedFamilyName[],
183 const SkFontStyle& requestedStyle) const override
184 {
185 SkAutoMutexExclusive ama(fMutex);
186
187 // Check if this request is already in the request cache.
188 using Request = SkFontRequestCache::Request;
189 std::unique_ptr<Request> request(Request::Create(requestedFamilyName, requestedStyle));
190 sk_sp<SkTypeface> face = fCache.findAndRef(request.get());
191 if (face) {
192 return sk_sp<SkTypeface>(face);
193 }
194
195 SkFontConfigInterface::FontIdentity identity;
196 SkString outFamilyName;
197 SkFontStyle outStyle;
198 if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle,
199 &identity, &outFamilyName, &outStyle))
200 {
201 return nullptr;
202 }
203
204 // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
205 face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
206 if (!face) {
207 face.reset(SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle));
208 // Add this FontIdentity to the FontIdentity cache.
209 fTFCache.add(face);
210 }
211 // Add this request to the request cache.
212 fCache.add(face, request.release());
213
214 return face;
215 }
216
onMatchFamilyStyleCharacter(const char familyName[],const SkFontStyle &,const char * bcp47[],int bcp47Count,SkUnichar character) const217 sk_sp<SkTypeface> onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
218 const char* bcp47[], int bcp47Count,
219 SkUnichar character) const override {
220 SK_ABORT("Not implemented.");
221 }
222
onMakeFromData(sk_sp<SkData> data,int ttcIndex) const223 sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData> data, int ttcIndex) const override {
224 return this->onMakeFromStreamIndex(SkMemoryStream::Make(std::move(data)), ttcIndex);
225 }
226
onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,int ttcIndex) const227 sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,
228 int ttcIndex) const override {
229 return this->makeFromStream(std::move(stream),
230 SkFontArguments().setCollectionIndex(ttcIndex));
231 }
232
onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,const SkFontArguments & args) const233 sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
234 const SkFontArguments& args) const override {
235 const size_t length = stream->getLength();
236 if (!length) {
237 return nullptr;
238 }
239 if (length >= 1024 * 1024 * 1024) {
240 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
241 }
242
243 return SkTypeface_FreeType::MakeFromStream(std::move(stream), args);
244 }
245
onMakeFromFile(const char path[],int ttcIndex) const246 sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
247 std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path);
248 return stream ? this->makeFromStream(std::move(stream), ttcIndex) : nullptr;
249 }
250
onLegacyMakeTypeface(const char requestedFamilyName[],SkFontStyle requestedStyle) const251 sk_sp<SkTypeface> onLegacyMakeTypeface(const char requestedFamilyName[],
252 SkFontStyle requestedStyle) const override {
253 return this->onMatchFamilyStyle(requestedFamilyName, requestedStyle);
254 }
255 };
256
SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci)257 SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci) {
258 SkASSERT(fci);
259 return sk_make_sp<SkFontMgr_FCI>(std::move(fci));
260 }
261