1 /*
2 * Copyright 2011 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 "src/core/SkTypefaceCache.h"
9
10 #include "include/core/SkFontStyle.h"
11 #include "include/core/SkGraphics.h"
12 #include "include/core/SkString.h"
13 #include "include/private/base/SkDebug.h"
14 #include "include/private/base/SkMutex.h"
15
16 #include <atomic>
17 #include <cstdint>
18 #include <utility>
19
SkTypefaceCache()20 SkTypefaceCache::SkTypefaceCache() {}
21
add(sk_sp<SkTypeface> face)22 void SkTypefaceCache::add(sk_sp<SkTypeface> face) {
23 const auto limit = SkGraphics::GetTypefaceCacheCountLimit();
24
25 if (fTypefaces.size() >= limit) {
26 this->purge(limit >> 2);
27 }
28 if (limit > 0) {
29 fTypefaces.emplace_back(std::move(face));
30 }
31 }
32
findByProcAndRef(FindProc proc,void * ctx) const33 sk_sp<SkTypeface> SkTypefaceCache::findByProcAndRef(FindProc proc, void* ctx) const {
34 for (const sk_sp<SkTypeface>& typeface : fTypefaces) {
35 if (proc(typeface.get(), ctx)) {
36 return typeface;
37 }
38 }
39 return nullptr;
40 }
41
purge(int numToPurge)42 void SkTypefaceCache::purge(int numToPurge) {
43 int count = fTypefaces.size();
44 int i = 0;
45 while (i < count) {
46 if (fTypefaces[i]->unique()) {
47 fTypefaces.removeShuffle(i);
48 --count;
49 if (--numToPurge == 0) {
50 return;
51 }
52 } else {
53 ++i;
54 }
55 }
56 }
57
purgeAll()58 void SkTypefaceCache::purgeAll() {
59 this->purge(fTypefaces.size());
60 }
61
62 ///////////////////////////////////////////////////////////////////////////////
63
Get()64 SkTypefaceCache& SkTypefaceCache::Get() {
65 static SkTypefaceCache gCache;
66 return gCache;
67 }
68
NewTypefaceID()69 SkTypefaceID SkTypefaceCache::NewTypefaceID() {
70 static std::atomic<int32_t> nextID{1};
71 return nextID.fetch_add(1, std::memory_order_relaxed);
72 }
73
typeface_cache_mutex()74 static SkMutex& typeface_cache_mutex() {
75 static SkMutex& mutex = *(new SkMutex);
76 return mutex;
77 }
78
Add(sk_sp<SkTypeface> face)79 void SkTypefaceCache::Add(sk_sp<SkTypeface> face) {
80 SkAutoMutexExclusive ama(typeface_cache_mutex());
81 Get().add(std::move(face));
82 }
83
FindByProcAndRef(FindProc proc,void * ctx)84 sk_sp<SkTypeface> SkTypefaceCache::FindByProcAndRef(FindProc proc, void* ctx) {
85 SkAutoMutexExclusive ama(typeface_cache_mutex());
86 return Get().findByProcAndRef(proc, ctx);
87 }
88
PurgeAll()89 void SkTypefaceCache::PurgeAll() {
90 SkAutoMutexExclusive ama(typeface_cache_mutex());
91 Get().purgeAll();
92 }
93
94 ///////////////////////////////////////////////////////////////////////////////
95
96 #ifdef SK_DEBUG
DumpProc(SkTypeface * face,void * ctx)97 static bool DumpProc(SkTypeface* face, void* ctx) {
98 SkString n;
99 face->getFamilyName(&n);
100 SkFontStyle s = face->fontStyle();
101 SkTypefaceID id = face->uniqueID();
102 SkDebugf("SkTypefaceCache: face %p typefaceID %u weight %d width %d style %d name %s\n",
103 face, id, s.weight(), s.width(), s.slant(), n.c_str());
104 return false;
105 }
106 #endif
107
Dump()108 void SkTypefaceCache::Dump() {
109 #ifdef SK_DEBUG
110 (void)Get().findByProcAndRef(DumpProc, nullptr);
111 #endif
112 }
113