123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122 |
- // Copyright 2014 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "chrome/browser/font_family_cache.h"
- #include <stddef.h>
- #include <map>
- #include "base/bind.h"
- #include "base/memory/ptr_util.h"
- #include "base/strings/stringprintf.h"
- #include "base/strings/utf_string_conversions.h"
- #include "chrome/browser/font_pref_change_notifier_factory.h"
- #include "chrome/browser/profiles/profile.h"
- #include "chrome/common/pref_font_webkit_names.h"
- #include "chrome/common/pref_names.h"
- #include "components/prefs/pref_service.h"
- // Identifies the user data on the profile.
- const char kFontFamilyCacheKey[] = "FontFamilyCacheKey";
- FontFamilyCache::FontFamilyCache(Profile* profile)
- : prefs_(profile->GetPrefs()) {
- font_change_registrar_.Register(
- FontPrefChangeNotifierFactory::GetForProfile(profile),
- base::BindRepeating(&FontFamilyCache::OnPrefsChanged,
- base::Unretained(this)));
- }
- FontFamilyCache::~FontFamilyCache() = default;
- void FontFamilyCache::FillFontFamilyMap(
- Profile* profile,
- const char* map_name,
- blink::web_pref::ScriptFontFamilyMap* map) {
- FontFamilyCache* cache =
- static_cast<FontFamilyCache*>(profile->GetUserData(&kFontFamilyCacheKey));
- if (!cache) {
- cache = new FontFamilyCache(profile);
- profile->SetUserData(&kFontFamilyCacheKey, base::WrapUnique(cache));
- }
- cache->FillFontFamilyMap(map_name, map);
- }
- void FontFamilyCache::FillFontFamilyMap(
- const char* map_name,
- blink::web_pref::ScriptFontFamilyMap* map) {
- // TODO(falken): Get rid of the brute-force scan over possible
- // (font family / script) combinations - see http://crbug.com/308095.
- for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
- const char* script = prefs::kWebKitScriptsForFontFamilyMaps[i];
- std::u16string result = FetchAndCacheFont(script, map_name);
- if (!result.empty())
- (*map)[script] = result;
- }
- }
- std::u16string FontFamilyCache::FetchFont(const char* script,
- const char* map_name) {
- std::string pref_name = base::StringPrintf("%s.%s", map_name, script);
- std::string font = prefs_->GetString(pref_name.c_str());
- std::u16string font16 = base::UTF8ToUTF16(font);
- // Lazily constructs the map if it doesn't already exist.
- ScriptFontMap& map = font_family_map_[map_name];
- map[script] = font16;
- return font16;
- }
- std::u16string FontFamilyCache::FetchAndCacheFont(const char* script,
- const char* map_name) {
- FontFamilyMap::const_iterator it = font_family_map_.find(map_name);
- if (it != font_family_map_.end()) {
- auto it2 = it->second.find(script);
- if (it2 != it->second.end())
- return it2->second;
- }
- return FetchFont(script, map_name);
- }
- // There are ~1000 entries in the cache. Avoid unnecessary object construction,
- // including std::string.
- void FontFamilyCache::OnPrefsChanged(const std::string& pref_name) {
- const size_t delimiter_length = 1;
- const char delimiter = '.';
- for (auto& it : font_family_map_) {
- const char* map_name = it.first;
- size_t map_name_length = strlen(map_name);
- // If the map name doesn't match, move on.
- if (pref_name.compare(0, map_name_length, map_name) != 0)
- continue;
- ScriptFontMap& map = it.second;
- for (auto it2 = map.begin(); it2 != map.end(); ++it2) {
- const char* script = it2->first;
- size_t script_length = strlen(script);
- // If the length doesn't match, move on.
- if (pref_name.size() !=
- map_name_length + script_length + delimiter_length)
- continue;
- // If the script doesn't match, move on.
- if (pref_name.compare(
- map_name_length + delimiter_length, script_length, script) != 0)
- continue;
- // If the delimiter doesn't match, move on.
- if (pref_name[map_name_length] != delimiter)
- continue;
- // Clear the cache.
- map.erase(it2);
- break;
- }
- }
- }
|