1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* 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, const SkFontStyle&, 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.
static const size_t gMaxSize = 1 << 12;
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[],
SkTypeface::Style requestedOldStyle)
{
SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
if (nullptr == fci.get()) {
return nullptr;
}
// Check if this request is already in the request cache.
using Request = SkFontHostRequestCache::Request;
SkFontStyle requestedStyle(requestedOldStyle);
SkAutoTDelete<Request> request(Request::Create(requestedFamilyName, requestedStyle));
SkTypeface* face = SkFontHostRequestCache::FindAndRef(request);
if (face) {
return face;
}
SkFontConfigInterface::FontIdentity identity;
SkString outFamilyName;
SkTypeface::Style outOldStyle;
if (!fci->matchFamilyName(requestedFamilyName, requestedOldStyle,
&identity, &outFamilyName, &outOldStyle))
{
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(SkFontStyle(outOldStyle), identity, outFamilyName);
// Add this FontIdentity to the FontIdentity cache.
SkTypefaceCache::Add(face, SkFontStyle(outOldStyle));
}
// 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());
}
|
