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/SkFontScanner.h"
10 #include "include/core/SkFontStyle.h"
11 #include "include/core/SkString.h"
12 #include "include/core/SkTypeface.h"
13 #include "include/ports/SkFontConfigInterface.h"
14 #include "include/ports/SkFontMgr_FontConfigInterface.h"
15 #include "include/ports/SkFontScanner_FreeType.h"
16 #include "include/private/base/SkMutex.h"
17 #include "src/core/SkFontDescriptor.h"
18 #include "src/core/SkResourceCache.h"
19 #include "src/core/SkTypefaceCache.h"
20 #include "src/ports/SkFontConfigTypeface.h"
21 #include "src/ports/SkTypeface_FreeType.h"
22
23 #include <new>
24
25 using namespace skia_private;
26
onOpenStream(int * ttcIndex) const27 std::unique_ptr<SkStreamAsset> SkTypeface_FCI::onOpenStream(int* ttcIndex) const {
28 *ttcIndex = this->getIdentity().fTTCIndex;
29 return std::unique_ptr<SkStreamAsset>(fFCI->openStream(this->getIdentity()));
30 }
31
onGetFontDescriptor(SkFontDescriptor * desc,bool * serialize) const32 void SkTypeface_FCI::onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const {
33 SkTypeface_proxy::onGetFontDescriptor(desc, serialize);
34 SkString name;
35 this->getFamilyName(&name);
36 desc->setFamilyName(name.c_str());
37 desc->setStyle(this->fontStyle());
38 *serialize = true;
39 }
40
41 ///////////////////////////////////////////////////////////////////////////////
42
43 class SkFontStyleSet_FCI : public SkFontStyleSet {
44 public:
SkFontStyleSet_FCI()45 SkFontStyleSet_FCI() {}
46
count()47 int count() override { return 0; }
getStyle(int index,SkFontStyle *,SkString * style)48 void getStyle(int index, SkFontStyle*, SkString* style) override { SkASSERT(false); }
createTypeface(int index)49 sk_sp<SkTypeface> createTypeface(int index) override { SkASSERT(false); return nullptr; }
matchStyle(const SkFontStyle & pattern)50 sk_sp<SkTypeface> matchStyle(const SkFontStyle& pattern) override { return nullptr; }
51 };
52
53 ///////////////////////////////////////////////////////////////////////////////
54
55 class SkFontRequestCache {
56 public:
57 struct Request : public SkResourceCache::Key {
58 private:
RequestSkFontRequestCache::Request59 Request(const char* name, size_t nameLen, const SkFontStyle& style) : fStyle(style) {
60 /** Pointer to just after the last field of this class. */
61 char* content = const_cast<char*>(SkTAfter<const char>(&this->fStyle));
62
63 // No holes.
64 SkASSERT(SkTAddOffset<char>(this, sizeof(SkResourceCache::Key) + keySize) == content);
65
66 // Has a size divisible by size of uint32_t.
67 SkASSERT((content - reinterpret_cast<char*>(this)) % sizeof(uint32_t) == 0);
68
69 size_t contentLen = SkAlign4(nameLen);
70 sk_careful_memcpy(content, name, nameLen);
71 sk_bzero(content + nameLen, contentLen - nameLen);
72 this->init(nullptr, 0, keySize + contentLen);
73 }
74 const SkFontStyle fStyle;
75 /** The sum of the sizes of the fields of this class. */
76 static const size_t keySize = sizeof(fStyle);
77
78 public:
CreateSkFontRequestCache::Request79 static Request* Create(const char* name, const SkFontStyle& style) {
80 size_t nameLen = name ? strlen(name) : 0;
81 size_t contentLen = SkAlign4(nameLen);
82 char* storage = new char[sizeof(Request) + contentLen];
83 return new (storage) Request(name, nameLen, style);
84 }
operator deleteSkFontRequestCache::Request85 void operator delete(void* storage) {
86 delete[] reinterpret_cast<char*>(storage);
87 }
88 };
89
90
91 private:
92 struct Result : public SkResourceCache::Rec {
ResultSkFontRequestCache::Result93 Result(Request* request, sk_sp<SkTypeface> typeface)
94 : fRequest(request), fFace(std::move(typeface)) {}
95 Result(Result&&) = default;
96 Result& operator=(Result&&) = default;
97
getKeySkFontRequestCache::Result98 const Key& getKey() const override { return *fRequest; }
bytesUsedSkFontRequestCache::Result99 size_t bytesUsed() const override { return fRequest->size() + sizeof(fFace); }
getCategorySkFontRequestCache::Result100 const char* getCategory() const override { return "request_cache"; }
diagnostic_only_getDiscardableSkFontRequestCache::Result101 SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; }
102
103 std::unique_ptr<Request> fRequest;
104 sk_sp<SkTypeface> fFace;
105 };
106
107 SkResourceCache fCachedResults;
108
109 public:
SkFontRequestCache(size_t maxSize)110 SkFontRequestCache(size_t maxSize) : fCachedResults(maxSize) {}
111
112 /** Takes ownership of request. It will be deleted when no longer needed. */
add(sk_sp<SkTypeface> face,Request * request)113 void add(sk_sp<SkTypeface> face, Request* request) {
114 fCachedResults.add(new Result(request, std::move(face)));
115 }
116 /** Does not take ownership of request. */
findAndRef(Request * request)117 sk_sp<SkTypeface> findAndRef(Request* request) {
118 sk_sp<SkTypeface> face;
119 fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool {
120 const Result& result = static_cast<const Result&>(rec);
121 sk_sp<SkTypeface>* face = static_cast<sk_sp<SkTypeface>*>(context);
122
123 *face = result.fFace;
124 return true;
125 }, &face);
126 return face;
127 }
128 };
129
130 ///////////////////////////////////////////////////////////////////////////////
131
find_by_FontIdentity(SkTypeface * cachedTypeface,void * ctx)132 static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) {
133 typedef SkFontConfigInterface::FontIdentity FontIdentity;
134 SkTypeface_FCI* cachedFCTypeface = static_cast<SkTypeface_FCI*>(cachedTypeface);
135 FontIdentity* identity = static_cast<FontIdentity*>(ctx);
136
137 return cachedFCTypeface->getIdentity() == *identity;
138 }
139
140 ///////////////////////////////////////////////////////////////////////////////
141
142 class SkFontMgr_FCI : public SkFontMgr {
143 sk_sp<SkFontConfigInterface> fFCI;
144 std::unique_ptr<SkFontScanner> fScanner;
145
146 mutable SkMutex fMutex;
147 mutable SkTypefaceCache fTFCache;
148
149 // The value of maxSize here is a compromise between cache hits and cache size.
150 // See https://crbug.com/424082#63 for reason for current size.
151 static const size_t kMaxSize = 1 << 15;
152 mutable SkFontRequestCache fCache;
153
154 public:
SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci,std::unique_ptr<SkFontScanner> scanner)155 SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci, std::unique_ptr<SkFontScanner> scanner)
156 : fFCI(std::move(fci))
157 , fScanner(std::move(scanner))
158 , fCache(kMaxSize)
159 {
160 SkASSERT_RELEASE(fFCI);
161 }
162
163 protected:
onCountFamilies() const164 int onCountFamilies() const override {
165 SK_ABORT("Not implemented.");
166 }
167
onGetFamilyName(int index,SkString * familyName) const168 void onGetFamilyName(int index, SkString* familyName) const override {
169 SK_ABORT("Not implemented.");
170 }
171
onCreateStyleSet(int index) const172 sk_sp<SkFontStyleSet> onCreateStyleSet(int index) const override {
173 SK_ABORT("Not implemented.");
174 }
175
onMatchFamily(const char familyName[]) const176 sk_sp<SkFontStyleSet> onMatchFamily(const char familyName[]) const override {
177 SK_ABORT("Not implemented.");
178 }
179
onMatchFamilyStyle(const char requestedFamilyName[],const SkFontStyle & requestedStyle) const180 sk_sp<SkTypeface> onMatchFamilyStyle(const char requestedFamilyName[],
181 const SkFontStyle& requestedStyle) const override
182 {
183 SkAutoMutexExclusive ama(fMutex);
184
185 // Check if this request is already in the request cache.
186 using Request = SkFontRequestCache::Request;
187 std::unique_ptr<Request> request(Request::Create(requestedFamilyName, requestedStyle));
188 sk_sp<SkTypeface> face = fCache.findAndRef(request.get());
189 if (face) {
190 return sk_sp<SkTypeface>(face);
191 }
192
193 SkFontConfigInterface::FontIdentity identity;
194 SkString outFamilyName;
195 SkFontStyle outStyle;
196 if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle,
197 &identity, &outFamilyName, &outStyle))
198 {
199 return nullptr;
200 }
201
202 // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
203 face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
204 if (!face) {
205 sk_sp<SkTypeface> realTypeface = fScanner->MakeFromStream(
206 std::unique_ptr<SkStreamAsset>(fFCI->openStream(identity)),
207 SkFontArguments().setCollectionIndex(identity.fTTCIndex));
208 face.reset(SkTypeface_FCI::Create(std::move(realTypeface), fFCI, identity,
209 std::move(outFamilyName), outStyle, false));
210 // Add this FontIdentity to the FontIdentity cache.
211 fTFCache.add(face);
212 }
213 // Add this request to the request cache.
214 fCache.add(face, request.release());
215
216 return face;
217 }
218
onMatchFamilyStyleCharacter(const char familyName[],const SkFontStyle &,const char * bcp47[],int bcp47Count,SkUnichar character) const219 sk_sp<SkTypeface> onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
220 const char* bcp47[], int bcp47Count,
221 SkUnichar character) const override {
222 SK_ABORT("Not implemented.");
223 }
224
onMakeFromData(sk_sp<SkData> data,int ttcIndex) const225 sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData> data, int ttcIndex) const override {
226 return this->onMakeFromStreamIndex(SkMemoryStream::Make(std::move(data)), ttcIndex);
227 }
228
onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,int ttcIndex) const229 sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,
230 int ttcIndex) const override {
231 return this->makeFromStream(std::move(stream),
232 SkFontArguments().setCollectionIndex(ttcIndex));
233 }
234
onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,const SkFontArguments & args) const235 sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
236 const SkFontArguments& args) const override {
237 const size_t length = stream->getLength();
238 if (!length) {
239 return nullptr;
240 }
241 if (length >= 1024 * 1024 * 1024) {
242 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
243 }
244
245 return SkTypeface_FreeType::MakeFromStream(std::move(stream), args);
246 }
247
onMakeFromFile(const char path[],int ttcIndex) const248 sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
249 std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path);
250 return stream ? this->makeFromStream(std::move(stream), ttcIndex) : nullptr;
251 }
252
onLegacyMakeTypeface(const char requestedFamilyName[],SkFontStyle requestedStyle) const253 sk_sp<SkTypeface> onLegacyMakeTypeface(const char requestedFamilyName[],
254 SkFontStyle requestedStyle) const override {
255 return this->onMatchFamilyStyle(requestedFamilyName, requestedStyle);
256 }
257 };
258
SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci,std::unique_ptr<SkFontScanner> scanner)259 SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci,
260 std::unique_ptr<SkFontScanner> scanner) {
261 SkASSERT(fci);
262 return sk_make_sp<SkFontMgr_FCI>(std::move(fci), std::move(scanner));
263 }
264
SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci)265 SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci) {
266 SkASSERT(fci);
267 return sk_make_sp<SkFontMgr_FCI>(std::move(fci), SkFontScanner_Make_FreeType());
268 }
269