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 "SkFontConfigInterface.h"
9 #include "SkFontConfigTypeface.h"
10 #include "SkFontDescriptor.h"
11 #include "SkFontMgr.h"
12 #include "SkFontMgr_FontConfigInterface.h"
13 #include "SkFontStyle.h"
14 #include "SkMakeUnique.h"
15 #include "SkMutex.h"
16 #include "SkString.h"
17 #include "SkTypeface.h"
18 #include "SkTypefaceCache.h"
19 #include "SkResourceCache.h"
20
onOpenStream(int * ttcIndex) const21 SkStreamAsset* SkTypeface_FCI::onOpenStream(int* ttcIndex) const {
22 *ttcIndex = this->getIdentity().fTTCIndex;
23
24 if (fFontData) {
25 SkStreamAsset* stream = fFontData->getStream();
26 if (!stream) {
27 return nullptr;
28 }
29 return stream->duplicate();
30 }
31
32 return fFCI->openStream(this->getIdentity());
33 }
34
onMakeFontData() const35 std::unique_ptr<SkFontData> SkTypeface_FCI::onMakeFontData() const {
36 if (fFontData) {
37 return skstd::make_unique<SkFontData>(*fFontData);
38 }
39
40 const SkFontConfigInterface::FontIdentity& id = this->getIdentity();
41 return skstd::make_unique<SkFontData>(std::unique_ptr<SkStreamAsset>(fFCI->openStream(id)),
42 id.fTTCIndex, nullptr, 0);
43 }
44
onGetFontDescriptor(SkFontDescriptor * desc,bool * isLocalStream) const45 void SkTypeface_FCI::onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocalStream) const {
46 SkString name;
47 this->getFamilyName(&name);
48 desc->setFamilyName(name.c_str());
49 desc->setStyle(this->fontStyle());
50 *isLocalStream = SkToBool(fFontData);
51 }
52
53 ///////////////////////////////////////////////////////////////////////////////
54
55 class SkFontStyleSet_FCI : public SkFontStyleSet {
56 public:
SkFontStyleSet_FCI()57 SkFontStyleSet_FCI() {}
58
count()59 int count() override { return 0; }
getStyle(int index,SkFontStyle *,SkString * style)60 void getStyle(int index, SkFontStyle*, SkString* style) override { SkASSERT(false); }
createTypeface(int index)61 SkTypeface* createTypeface(int index) override { SkASSERT(false); return nullptr; }
matchStyle(const SkFontStyle & pattern)62 SkTypeface* matchStyle(const SkFontStyle& pattern) override { return nullptr; }
63 };
64
65 ///////////////////////////////////////////////////////////////////////////////
66
67 class SkFontRequestCache {
68 public:
69 struct Request : public SkResourceCache::Key {
70 private:
RequestSkFontRequestCache::Request71 Request(const char* name, size_t nameLen, const SkFontStyle& style) : fStyle(style) {
72 /** Pointer to just after the last field of this class. */
73 char* content = const_cast<char*>(SkTAfter<const char>(&this->fStyle));
74
75 // No holes.
76 SkASSERT(SkTAddOffset<char>(this, sizeof(SkResourceCache::Key) + keySize) == content);
77
78 // Has a size divisible by size of uint32_t.
79 SkASSERT((content - reinterpret_cast<char*>(this)) % sizeof(uint32_t) == 0);
80
81 size_t contentLen = SkAlign4(nameLen);
82 sk_careful_memcpy(content, name, nameLen);
83 sk_bzero(content + nameLen, contentLen - nameLen);
84 this->init(nullptr, 0, keySize + contentLen);
85 }
86 const SkFontStyle fStyle;
87 /** The sum of the sizes of the fields of this class. */
88 static const size_t keySize = sizeof(fStyle);
89
90 public:
CreateSkFontRequestCache::Request91 static Request* Create(const char* name, const SkFontStyle& style) {
92 size_t nameLen = name ? strlen(name) : 0;
93 size_t contentLen = SkAlign4(nameLen);
94 char* storage = new char[sizeof(Request) + contentLen];
95 return new (storage) Request(name, nameLen, style);
96 }
operator deleteSkFontRequestCache::Request97 void operator delete(void* storage) {
98 delete[] reinterpret_cast<char*>(storage);
99 }
100 };
101
102
103 private:
104 struct Result : public SkResourceCache::Rec {
ResultSkFontRequestCache::Result105 Result(Request* request, SkTypeface* typeface)
106 : fRequest(request)
107 , fFace(SkSafeRef(typeface)) {}
108 Result(Result&&) = default;
109 Result& operator=(Result&&) = default;
110
getKeySkFontRequestCache::Result111 const Key& getKey() const override { return *fRequest; }
bytesUsedSkFontRequestCache::Result112 size_t bytesUsed() const override { return fRequest->size() + sizeof(fFace); }
getCategorySkFontRequestCache::Result113 const char* getCategory() const override { return "request_cache"; }
diagnostic_only_getDiscardableSkFontRequestCache::Result114 SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; }
115
116 std::unique_ptr<Request> fRequest;
117 sk_sp<SkTypeface> fFace;
118 };
119
120 SkResourceCache fCachedResults;
121
122 public:
SkFontRequestCache(size_t maxSize)123 SkFontRequestCache(size_t maxSize) : fCachedResults(maxSize) {}
124
125 /** Takes ownership of request. It will be deleted when no longer needed. */
add(SkTypeface * face,Request * request)126 void add(SkTypeface* face, Request* request) {
127 fCachedResults.add(new Result(request, face));
128 }
129 /** Does not take ownership of request. */
findAndRef(Request * request)130 SkTypeface* findAndRef(Request* request) {
131 SkTypeface* face = nullptr;
132 fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool {
133 const Result& result = static_cast<const Result&>(rec);
134 SkTypeface** face = static_cast<SkTypeface**>(context);
135
136 *face = result.fFace.get();
137 return true;
138 }, &face);
139 return SkSafeRef(face);
140 }
141 };
142
143 ///////////////////////////////////////////////////////////////////////////////
144
find_by_FontIdentity(SkTypeface * cachedTypeface,void * ctx)145 static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) {
146 typedef SkFontConfigInterface::FontIdentity FontIdentity;
147 SkTypeface_FCI* cachedFCTypeface = static_cast<SkTypeface_FCI*>(cachedTypeface);
148 FontIdentity* identity = static_cast<FontIdentity*>(ctx);
149
150 return cachedFCTypeface->getIdentity() == *identity;
151 }
152
153 ///////////////////////////////////////////////////////////////////////////////
154
155 class SkFontMgr_FCI : public SkFontMgr {
156 sk_sp<SkFontConfigInterface> fFCI;
157 SkTypeface_FreeType::Scanner fScanner;
158
159 mutable SkMutex fMutex;
160 mutable SkTypefaceCache fTFCache;
161
162 // The value of maxSize here is a compromise between cache hits and cache size.
163 // See https://crbug.com/424082#63 for reason for current size.
164 static const size_t kMaxSize = 1 << 15;
165 mutable SkFontRequestCache fCache;
166
167 public:
SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci)168 SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci)
169 : fFCI(std::move(fci))
170 , fCache(kMaxSize)
171 {}
172
173 protected:
onCountFamilies() const174 int onCountFamilies() const override {
175 return 0;
176 }
177
onGetFamilyName(int index,SkString * familyName) const178 void onGetFamilyName(int index, SkString* familyName) const override {
179 SkFAIL("Not implemented.");
180 }
181
onCreateStyleSet(int index) const182 SkFontStyleSet* onCreateStyleSet(int index) const override {
183 SkFAIL("Not implemented.");
184 return nullptr;
185 }
186
onMatchFamily(const char familyName[]) const187 SkFontStyleSet* onMatchFamily(const char familyName[]) const override {
188 return new SkFontStyleSet_FCI();
189 }
190
onMatchFamilyStyle(const char familyName[],const SkFontStyle &) const191 SkTypeface* onMatchFamilyStyle(const char familyName[],
192 const SkFontStyle&) const override { return nullptr; }
onMatchFamilyStyleCharacter(const char familyName[],const SkFontStyle &,const char * bcp47[],int bcp47Count,SkUnichar character) const193 SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
194 const char* bcp47[], int bcp47Count,
195 SkUnichar character) const override {
196 return nullptr;
197 }
onMatchFaceStyle(const SkTypeface *,const SkFontStyle &) const198 SkTypeface* onMatchFaceStyle(const SkTypeface*,
199 const SkFontStyle&) const override { return nullptr; }
200
onCreateFromData(SkData *,int ttcIndex) const201 SkTypeface* onCreateFromData(SkData*, int ttcIndex) const override { return nullptr; }
202
onCreateFromStream(SkStreamAsset * bareStream,int ttcIndex) const203 SkTypeface* onCreateFromStream(SkStreamAsset* bareStream, int ttcIndex) const override {
204 std::unique_ptr<SkStreamAsset> stream(bareStream);
205 const size_t length = stream->getLength();
206 if (!length) {
207 return nullptr;
208 }
209 if (length >= 1024 * 1024 * 1024) {
210 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
211 }
212
213 // TODO should the caller give us the style or should we get it from freetype?
214 SkString name;
215 SkFontStyle style;
216 bool isFixedPitch = false;
217 if (!fScanner.scanFont(stream.get(), 0, &name, &style, &isFixedPitch, nullptr)) {
218 return nullptr;
219 }
220
221 auto fontData = skstd::make_unique<SkFontData>(std::move(stream), ttcIndex, nullptr, 0);
222 return SkTypeface_FCI::Create(std::move(fontData), std::move(name), style, isFixedPitch);
223 }
224
onCreateFromStream(SkStreamAsset * s,const SkFontArguments & args) const225 SkTypeface* onCreateFromStream(SkStreamAsset* s, const SkFontArguments& args) const override {
226 using Scanner = SkTypeface_FreeType::Scanner;
227 std::unique_ptr<SkStreamAsset> stream(s);
228 const size_t length = stream->getLength();
229 if (!length) {
230 return nullptr;
231 }
232 if (length >= 1024 * 1024 * 1024) {
233 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
234 }
235
236 bool isFixedPitch;
237 SkFontStyle style;
238 SkString name;
239 Scanner::AxisDefinitions axisDefinitions;
240 if (!fScanner.scanFont(stream.get(), args.getCollectionIndex(),
241 &name, &style, &isFixedPitch, &axisDefinitions))
242 {
243 return nullptr;
244 }
245
246 SkAutoSTMalloc<4, SkFixed> axisValues(axisDefinitions.count());
247 Scanner::computeAxisValues(axisDefinitions, args.getVariationDesignPosition(),
248 axisValues, name);
249
250 auto fontData = skstd::make_unique<SkFontData>(std::move(stream),
251 args.getCollectionIndex(),
252 axisValues.get(),
253 axisDefinitions.count());
254 return SkTypeface_FCI::Create(std::move(fontData), std::move(name), style, isFixedPitch);
255 }
256
onCreateFromFile(const char path[],int ttcIndex) const257 SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override {
258 std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path);
259 return stream.get() ? this->createFromStream(stream.release(), ttcIndex) : nullptr;
260 }
261
onLegacyCreateTypeface(const char requestedFamilyName[],SkFontStyle requestedStyle) const262 SkTypeface* onLegacyCreateTypeface(const char requestedFamilyName[],
263 SkFontStyle requestedStyle) const override
264 {
265 SkAutoMutexAcquire ama(fMutex);
266
267 // Check if this request is already in the request cache.
268 using Request = SkFontRequestCache::Request;
269 std::unique_ptr<Request> request(Request::Create(requestedFamilyName, requestedStyle));
270 SkTypeface* face = fCache.findAndRef(request.get());
271 if (face) {
272 return face;
273 }
274
275 SkFontConfigInterface::FontIdentity identity;
276 SkString outFamilyName;
277 SkFontStyle outStyle;
278 if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle,
279 &identity, &outFamilyName, &outStyle))
280 {
281 return nullptr;
282 }
283
284 // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
285 face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
286 if (!face) {
287 face = SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle);
288 // Add this FontIdentity to the FontIdentity cache.
289 fTFCache.add(face);
290 }
291 // Add this request to the request cache.
292 fCache.add(face, request.release());
293
294 return face;
295 }
296 };
297
SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci)298 SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci) {
299 SkASSERT(fci);
300 return sk_make_sp<SkFontMgr_FCI>(std::move(fci));
301 }
302