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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/fonts/font_global_context.h"
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_unique_name_lookup.h"
#include "third_party/blink/renderer/platform/fonts/shaping/harfbuzz_face.h"
#include "third_party/blink/renderer/platform/privacy_budget/identifiability_digest_helpers.h"
#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
// While the size of these caches should usually be small (up to tens), we
// protect against the possibility of it growing quickly to thousands when
// animating variable font parameters.
static constexpr size_t kCachesMaxSize = 250;
namespace blink {
ThreadSpecific<Persistent<FontGlobalContext>>&
GetThreadSpecificFontGlobalContextPool() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<Persistent<FontGlobalContext>>,
thread_specific_pool, ());
return thread_specific_pool;
}
FontGlobalContext& FontGlobalContext::Get() {
auto& thread_specific_pool = GetThreadSpecificFontGlobalContextPool();
if (!*thread_specific_pool)
*thread_specific_pool = MakeGarbageCollected<FontGlobalContext>(PassKey());
return **thread_specific_pool;
}
FontGlobalContext* FontGlobalContext::TryGet() {
return GetThreadSpecificFontGlobalContextPool()->Get();
}
FontGlobalContext::FontGlobalContext(PassKey)
: typeface_digest_cache_(kCachesMaxSize),
postscript_name_digest_cache_(kCachesMaxSize) {}
FontGlobalContext::~FontGlobalContext() = default;
FontUniqueNameLookup* FontGlobalContext::GetFontUniqueNameLookup() {
if (!Get().font_unique_name_lookup_) {
Get().font_unique_name_lookup_ =
FontUniqueNameLookup::GetPlatformUniqueNameLookup();
}
return Get().font_unique_name_lookup_.get();
}
IdentifiableToken FontGlobalContext::GetOrComputeTypefaceDigest(
const FontPlatformData& source) {
SkTypeface* typeface = source.Typeface();
if (!typeface)
return 0;
SkTypefaceID font_id = typeface->uniqueID();
auto iter = typeface_digest_cache_.Get(font_id);
if (iter == typeface_digest_cache_.end())
iter = typeface_digest_cache_.Put(font_id, source.ComputeTypefaceDigest());
DCHECK(iter->second == source.ComputeTypefaceDigest());
return iter->second;
}
IdentifiableToken FontGlobalContext::GetOrComputePostScriptNameDigest(
const FontPlatformData& source) {
SkTypeface* typeface = source.Typeface();
if (!typeface)
return IdentifiableToken();
SkTypefaceID font_id = typeface->uniqueID();
auto iter = postscript_name_digest_cache_.Get(font_id);
if (iter == postscript_name_digest_cache_.end())
iter = postscript_name_digest_cache_.Put(
font_id, IdentifiabilityBenignStringToken(source.GetPostScriptName()));
DCHECK(iter->second ==
IdentifiabilityBenignStringToken(source.GetPostScriptName()));
return iter->second;
}
void FontGlobalContext::ClearMemory() {
FontGlobalContext* const context = TryGet();
if (!context)
return;
context->font_cache_.Invalidate();
context->typeface_digest_cache_.Clear();
context->postscript_name_digest_cache_.Clear();
}
void FontGlobalContext::Init() {
DCHECK(IsMainThread());
if (auto* name_lookup = FontGlobalContext::Get().GetFontUniqueNameLookup())
name_lookup->Init();
HarfBuzzFace::Init();
}
} // namespace blink
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