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// Copyright 2014 The Chromium Authors
// 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/functional/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;
}
}
}
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