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 "include/private/SkMutex.h"
9 #include "src/core/SkTypefaceCache.h"
10 #include <atomic>
11
12 #define TYPEFACE_CACHE_LIMIT 1024
13
SkTypefaceCache()14 SkTypefaceCache::SkTypefaceCache() {}
15
add(sk_sp<SkTypeface> face)16 void SkTypefaceCache::add(sk_sp<SkTypeface> face) {
17 if (fTypefaces.count() >= TYPEFACE_CACHE_LIMIT) {
18 this->purge(TYPEFACE_CACHE_LIMIT >> 2);
19 }
20
21 fTypefaces.emplace_back(std::move(face));
22 }
23
findByProcAndRef(FindProc proc,void * ctx) const24 sk_sp<SkTypeface> SkTypefaceCache::findByProcAndRef(FindProc proc, void* ctx) const {
25 for (const sk_sp<SkTypeface>& typeface : fTypefaces) {
26 if (proc(typeface.get(), ctx)) {
27 return typeface;
28 }
29 }
30 return nullptr;
31 }
32
purge(int numToPurge)33 void SkTypefaceCache::purge(int numToPurge) {
34 int count = fTypefaces.count();
35 int i = 0;
36 while (i < count) {
37 if (fTypefaces[i]->unique()) {
38 fTypefaces.removeShuffle(i);
39 --count;
40 if (--numToPurge == 0) {
41 return;
42 }
43 } else {
44 ++i;
45 }
46 }
47 }
48
purgeAll()49 void SkTypefaceCache::purgeAll() {
50 this->purge(fTypefaces.count());
51 }
52
53 ///////////////////////////////////////////////////////////////////////////////
54
Get()55 SkTypefaceCache& SkTypefaceCache::Get() {
56 static SkTypefaceCache gCache;
57 return gCache;
58 }
59
NewFontID()60 SkFontID SkTypefaceCache::NewFontID() {
61 static std::atomic<int32_t> nextID{1};
62 return nextID.fetch_add(1, std::memory_order_relaxed);
63 }
64
typeface_cache_mutex()65 static SkMutex& typeface_cache_mutex() {
66 static SkMutex& mutex = *(new SkMutex);
67 return mutex;
68 }
69
Add(sk_sp<SkTypeface> face)70 void SkTypefaceCache::Add(sk_sp<SkTypeface> face) {
71 SkAutoMutexExclusive ama(typeface_cache_mutex());
72 Get().add(std::move(face));
73 }
74
FindByProcAndRef(FindProc proc,void * ctx)75 sk_sp<SkTypeface> SkTypefaceCache::FindByProcAndRef(FindProc proc, void* ctx) {
76 SkAutoMutexExclusive ama(typeface_cache_mutex());
77 return Get().findByProcAndRef(proc, ctx);
78 }
79
PurgeAll()80 void SkTypefaceCache::PurgeAll() {
81 SkAutoMutexExclusive ama(typeface_cache_mutex());
82 Get().purgeAll();
83 }
84
85 ///////////////////////////////////////////////////////////////////////////////
86
87 #ifdef SK_DEBUG
DumpProc(SkTypeface * face,void * ctx)88 static bool DumpProc(SkTypeface* face, void* ctx) {
89 SkString n;
90 face->getFamilyName(&n);
91 SkFontStyle s = face->fontStyle();
92 SkFontID id = face->uniqueID();
93 SkDebugf("SkTypefaceCache: face %p fontID %d weight %d width %d style %d name %s\n",
94 face, id, s.weight(), s.width(), s.slant(), n.c_str());
95 return false;
96 }
97 #endif
98
Dump()99 void SkTypefaceCache::Dump() {
100 #ifdef SK_DEBUG
101 (void)Get().findByProcAndRef(DumpProc, nullptr);
102 #endif
103 }
104