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/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 <new>
20
21std::unique_ptr<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 std::unique_ptr<SkStreamAsset>(fFCI->openStream(this->getIdentity()));
33}
34
35std::unique_ptr<SkFontData> SkTypeface_FCI::onMakeFontData() const {
36 if (fFontData) {
37 return std::make_unique<SkFontData>(*fFontData);
38 }
39
40 const SkFontConfigInterface::FontIdentity& id = this->getIdentity();
41 return std::make_unique<SkFontData>(std::unique_ptr<SkStreamAsset>(fFCI->openStream(id)),
42 id.fTTCIndex, nullptr, 0);
43}
44
45void 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
55class SkFontStyleSet_FCI : public SkFontStyleSet {
56public:
57 SkFontStyleSet_FCI() {}
58
59 int count() override { return 0; }
60 void getStyle(int index, SkFontStyle*, SkString* style) override { SkASSERT(false); }
61 SkTypeface* createTypeface(int index) override { SkASSERT(false); return nullptr; }
62 SkTypeface* matchStyle(const SkFontStyle& pattern) override { return nullptr; }
63};
64
65///////////////////////////////////////////////////////////////////////////////
66
67class SkFontRequestCache {
68public:
69 struct Request : public SkResourceCache::Key {
70 private:
71 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:
91 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 }
97 void operator delete(void* storage) {
98 delete[] reinterpret_cast<char*>(storage);
99 }
100 };
101
102
103private:
104 struct Result : public SkResourceCache::Rec {
105 Result(Request* request, sk_sp<SkTypeface> typeface)
106 : fRequest(request), fFace(std::move(typeface)) {}
107 Result(Result&&) = default;
108 Result& operator=(Result&&) = default;
109
110 const Key& getKey() const override { return *fRequest; }
111 size_t bytesUsed() const override { return fRequest->size() + sizeof(fFace); }
112 const char* getCategory() const override { return "request_cache"; }
113 SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; }
114
115 std::unique_ptr<Request> fRequest;
116 sk_sp<SkTypeface> fFace;
117 };
118
119 SkResourceCache fCachedResults;
120
121public:
122 SkFontRequestCache(size_t maxSize) : fCachedResults(maxSize) {}
123
124 /** Takes ownership of request. It will be deleted when no longer needed. */
125 void add(sk_sp<SkTypeface> face, Request* request) {
126 fCachedResults.add(new Result(request, std::move(face)));
127 }
128 /** Does not take ownership of request. */
129 sk_sp<SkTypeface> findAndRef(Request* request) {
130 sk_sp<SkTypeface> face;
131 fCachedResults.find(*request, [](const SkResourceCache::Rec& rec, void* context) -> bool {
132 const Result& result = static_cast<const Result&>(rec);
133 sk_sp<SkTypeface>* face = static_cast<sk_sp<SkTypeface>*>(context);
134
135 *face = result.fFace;
136 return true;
137 }, &face);
138 return face;
139 }
140};
141
142///////////////////////////////////////////////////////////////////////////////
143
144static bool find_by_FontIdentity(SkTypeface* cachedTypeface, void* ctx) {
145 typedef SkFontConfigInterface::FontIdentity FontIdentity;
146 SkTypeface_FCI* cachedFCTypeface = static_cast<SkTypeface_FCI*>(cachedTypeface);
147 FontIdentity* identity = static_cast<FontIdentity*>(ctx);
148
149 return cachedFCTypeface->getIdentity() == *identity;
150}
151
152///////////////////////////////////////////////////////////////////////////////
153
154class SkFontMgr_FCI : public SkFontMgr {
155 sk_sp<SkFontConfigInterface> fFCI;
156 SkTypeface_FreeType::Scanner fScanner;
157
158 mutable SkMutex fMutex;
159 mutable SkTypefaceCache fTFCache;
160
161 // The value of maxSize here is a compromise between cache hits and cache size.
162 // See https://crbug.com/424082#63 for reason for current size.
163 static const size_t kMaxSize = 1 << 15;
164 mutable SkFontRequestCache fCache;
165
166public:
167 SkFontMgr_FCI(sk_sp<SkFontConfigInterface> fci)
168 : fFCI(std::move(fci))
169 , fCache(kMaxSize)
170 {}
171
172protected:
173 int onCountFamilies() const override {
174 SK_ABORT("Not implemented.");
175 }
176
177 void onGetFamilyName(int index, SkString* familyName) const override {
178 SK_ABORT("Not implemented.");
179 }
180
181 SkFontStyleSet* onCreateStyleSet(int index) const override {
182 SK_ABORT("Not implemented.");
183 }
184
185 SkFontStyleSet* onMatchFamily(const char familyName[]) const override {
186 SK_ABORT("Not implemented.");
187 }
188
189 SkTypeface* onMatchFamilyStyle(const char requestedFamilyName[],
190 const SkFontStyle& requestedStyle) const override
191 {
192 SkAutoMutexExclusive ama(fMutex);
193
194 SkFontConfigInterface::FontIdentity identity;
195 SkString outFamilyName;
196 SkFontStyle outStyle;
197 if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle,
198 &identity, &outFamilyName, &outStyle))
199 {
200 return nullptr;
201 }
202
203 // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
204 sk_sp<SkTypeface> face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
205 if (!face) {
206 face.reset(SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle));
207 // Add this FontIdentity to the FontIdentity cache.
208 fTFCache.add(face);
209 }
210 return face.release();
211 }
212
213 SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
214 const char* bcp47[], int bcp47Count,
215 SkUnichar character) const override {
216 SK_ABORT("Not implemented.");
217 }
218
219 SkTypeface* onMatchFaceStyle(const SkTypeface*, const SkFontStyle&) const override {
220 SK_ABORT("Not implemented.");
221 }
222
223 sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData> data, int ttcIndex) const override {
224 return this->onMakeFromStreamIndex(SkMemoryStream::Make(std::move(data)), ttcIndex);
225 }
226
227 sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,
228 int ttcIndex) const override {
229 const size_t length = stream->getLength();
230 if (!length) {
231 return nullptr;
232 }
233 if (length >= 1024 * 1024 * 1024) {
234 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
235 }
236
237 // TODO should the caller give us the style or should we get it from freetype?
238 SkString name;
239 SkFontStyle style;
240 bool isFixedPitch = false;
241 if (!fScanner.scanFont(stream.get(), 0, &name, &style, &isFixedPitch, nullptr)) {
242 return nullptr;
243 }
244
245 auto fontData = std::make_unique<SkFontData>(std::move(stream), ttcIndex, nullptr, 0);
246 return sk_sp<SkTypeface>(SkTypeface_FCI::Create(std::move(fontData), std::move(name),
247 style, isFixedPitch));
248 }
249
250 sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
251 const SkFontArguments& args) const override {
252 using Scanner = SkTypeface_FreeType::Scanner;
253 const size_t length = stream->getLength();
254 if (!length) {
255 return nullptr;
256 }
257 if (length >= 1024 * 1024 * 1024) {
258 return nullptr; // don't accept too large fonts (>= 1GB) for safety.
259 }
260
261 bool isFixedPitch;
262 SkFontStyle style;
263 SkString name;
264 Scanner::AxisDefinitions axisDefinitions;
265 if (!fScanner.scanFont(stream.get(), args.getCollectionIndex(),
266 &name, &style, &isFixedPitch, &axisDefinitions))
267 {
268 return nullptr;
269 }
270
271 SkAutoSTMalloc<4, SkFixed> axisValues(axisDefinitions.count());
272 Scanner::computeAxisValues(axisDefinitions, args.getVariationDesignPosition(),
273 axisValues, name);
274
275 auto fontData = std::make_unique<SkFontData>(std::move(stream),
276 args.getCollectionIndex(),
277 axisValues.get(),
278 axisDefinitions.count());
279 return sk_sp<SkTypeface>(SkTypeface_FCI::Create(std::move(fontData), std::move(name),
280 style, isFixedPitch));
281 }
282
283 sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
284 std::unique_ptr<SkStreamAsset> stream = SkStream::MakeFromFile(path);
285 return stream ? this->makeFromStream(std::move(stream), ttcIndex) : nullptr;
286 }
287
288 sk_sp<SkTypeface> onLegacyMakeTypeface(const char requestedFamilyName[],
289 SkFontStyle requestedStyle) const override
290 {
291 SkAutoMutexExclusive ama(fMutex);
292
293 // Check if this request is already in the request cache.
294 using Request = SkFontRequestCache::Request;
295 std::unique_ptr<Request> request(Request::Create(requestedFamilyName, requestedStyle));
296 sk_sp<SkTypeface> face = fCache.findAndRef(request.get());
297 if (face) {
298 return sk_sp<SkTypeface>(face);
299 }
300
301 SkFontConfigInterface::FontIdentity identity;
302 SkString outFamilyName;
303 SkFontStyle outStyle;
304 if (!fFCI->matchFamilyName(requestedFamilyName, requestedStyle,
305 &identity, &outFamilyName, &outStyle))
306 {
307 return nullptr;
308 }
309
310 // Check if a typeface with this FontIdentity is already in the FontIdentity cache.
311 face = fTFCache.findByProcAndRef(find_by_FontIdentity, &identity);
312 if (!face) {
313 face.reset(SkTypeface_FCI::Create(fFCI, identity, std::move(outFamilyName), outStyle));
314 // Add this FontIdentity to the FontIdentity cache.
315 fTFCache.add(face);
316 }
317 // Add this request to the request cache.
318 fCache.add(face, request.release());
319
320 return face;
321 }
322};
323
324SK_API sk_sp<SkFontMgr> SkFontMgr_New_FCI(sk_sp<SkFontConfigInterface> fci) {
325 SkASSERT(fci);
326 return sk_make_sp<SkFontMgr_FCI>(std::move(fci));
327}
328