7b4d490bfe
refactor: use fixed-size arrays for the font cache Since we know at compile time which [family x script] combos we want to cache, we can hold the cache in fixed std::arrays instead of in nested std::unordered_maps.
194 lines
7.5 KiB
C++
194 lines
7.5 KiB
C++
// Copyright (c) 2018 Slack Technologies, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/browser/font_defaults.h"
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#include <array>
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#include <string>
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#include <string_view>
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#include "base/stl_util.h"
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#include "base/strings/strcat.h"
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#include "base/strings/utf_string_conversions.h"
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#include "chrome/common/pref_names.h"
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#include "chrome/grit/platform_locale_settings.h"
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#include "third_party/blink/public/common/web_preferences/web_preferences.h"
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#include "ui/base/l10n/l10n_util.h"
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namespace {
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// The following list of font defaults was copied from
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// https://chromium.googlesource.com/chromium/src/+/69.0.3497.106/chrome/browser/ui/prefs/prefs_tab_helper.cc#152
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//
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// The only updates that should be made to this list are copying updates that
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// were made in Chromium.
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//
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// vvvvv DO NOT EDIT vvvvv
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struct FontDefault {
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const char* pref_name;
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int resource_id;
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};
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// Font pref defaults. The prefs that have defaults vary by platform, since not
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// all platforms have fonts for all scripts for all generic families.
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// TODO(falken): add proper defaults when possible for all
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// platforms/scripts/generic families.
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const FontDefault kFontDefaults[] = {
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{prefs::kWebKitStandardFontFamily, IDS_STANDARD_FONT_FAMILY},
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{prefs::kWebKitFixedFontFamily, IDS_FIXED_FONT_FAMILY},
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{prefs::kWebKitSerifFontFamily, IDS_SERIF_FONT_FAMILY},
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{prefs::kWebKitSansSerifFontFamily, IDS_SANS_SERIF_FONT_FAMILY},
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{prefs::kWebKitCursiveFontFamily, IDS_CURSIVE_FONT_FAMILY},
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{prefs::kWebKitFantasyFontFamily, IDS_FANTASY_FONT_FAMILY},
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#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
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{prefs::kWebKitStandardFontFamilyJapanese,
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IDS_STANDARD_FONT_FAMILY_JAPANESE},
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{prefs::kWebKitFixedFontFamilyJapanese, IDS_FIXED_FONT_FAMILY_JAPANESE},
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{prefs::kWebKitSerifFontFamilyJapanese, IDS_SERIF_FONT_FAMILY_JAPANESE},
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{prefs::kWebKitSansSerifFontFamilyJapanese,
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IDS_SANS_SERIF_FONT_FAMILY_JAPANESE},
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{prefs::kWebKitStandardFontFamilyKorean, IDS_STANDARD_FONT_FAMILY_KOREAN},
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{prefs::kWebKitSerifFontFamilyKorean, IDS_SERIF_FONT_FAMILY_KOREAN},
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{prefs::kWebKitSansSerifFontFamilyKorean,
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IDS_SANS_SERIF_FONT_FAMILY_KOREAN},
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{prefs::kWebKitStandardFontFamilySimplifiedHan,
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IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitSerifFontFamilySimplifiedHan,
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IDS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitSansSerifFontFamilySimplifiedHan,
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IDS_SANS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitStandardFontFamilyTraditionalHan,
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IDS_STANDARD_FONT_FAMILY_TRADITIONAL_HAN},
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{prefs::kWebKitSerifFontFamilyTraditionalHan,
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IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN},
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{prefs::kWebKitSansSerifFontFamilyTraditionalHan,
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IDS_SANS_SERIF_FONT_FAMILY_TRADITIONAL_HAN},
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#endif
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#if BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
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{prefs::kWebKitCursiveFontFamilySimplifiedHan,
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IDS_CURSIVE_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitCursiveFontFamilyTraditionalHan,
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IDS_CURSIVE_FONT_FAMILY_TRADITIONAL_HAN},
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#endif
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#if BUILDFLAG(IS_CHROMEOS)
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{prefs::kWebKitStandardFontFamilyArabic, IDS_STANDARD_FONT_FAMILY_ARABIC},
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{prefs::kWebKitSerifFontFamilyArabic, IDS_SERIF_FONT_FAMILY_ARABIC},
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{prefs::kWebKitSansSerifFontFamilyArabic,
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IDS_SANS_SERIF_FONT_FAMILY_ARABIC},
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{prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN},
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{prefs::kWebKitFixedFontFamilySimplifiedHan,
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IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitFixedFontFamilyTraditionalHan,
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IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN},
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#elif BUILDFLAG(IS_WIN)
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{prefs::kWebKitFixedFontFamilyArabic, IDS_FIXED_FONT_FAMILY_ARABIC},
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{prefs::kWebKitSansSerifFontFamilyArabic,
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IDS_SANS_SERIF_FONT_FAMILY_ARABIC},
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{prefs::kWebKitStandardFontFamilyCyrillic,
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IDS_STANDARD_FONT_FAMILY_CYRILLIC},
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{prefs::kWebKitFixedFontFamilyCyrillic, IDS_FIXED_FONT_FAMILY_CYRILLIC},
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{prefs::kWebKitSerifFontFamilyCyrillic, IDS_SERIF_FONT_FAMILY_CYRILLIC},
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{prefs::kWebKitSansSerifFontFamilyCyrillic,
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IDS_SANS_SERIF_FONT_FAMILY_CYRILLIC},
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{prefs::kWebKitStandardFontFamilyGreek, IDS_STANDARD_FONT_FAMILY_GREEK},
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{prefs::kWebKitFixedFontFamilyGreek, IDS_FIXED_FONT_FAMILY_GREEK},
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{prefs::kWebKitSerifFontFamilyGreek, IDS_SERIF_FONT_FAMILY_GREEK},
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{prefs::kWebKitSansSerifFontFamilyGreek, IDS_SANS_SERIF_FONT_FAMILY_GREEK},
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{prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN},
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{prefs::kWebKitCursiveFontFamilyKorean, IDS_CURSIVE_FONT_FAMILY_KOREAN},
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{prefs::kWebKitFixedFontFamilySimplifiedHan,
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IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN},
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{prefs::kWebKitFixedFontFamilyTraditionalHan,
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IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN},
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#endif
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};
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// ^^^^^ DO NOT EDIT ^^^^^
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// Get `kFontDefault`'s default fontname for [font family, script].
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// e.g. ("webkit.webprefs.fonts.fixed", "Zyyy") -> "Monospace"
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std::string GetDefaultFont(const std::string_view family_name,
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const std::string_view script_name) {
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const std::string pref_name = base::StrCat({family_name, ".", script_name});
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for (const FontDefault& pref : kFontDefaults) {
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if (pref_name == pref.pref_name) {
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return l10n_util::GetStringUTF8(pref.resource_id);
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}
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}
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return std::string{};
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}
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// Each font family has kWebKitScriptsForFontFamilyMapsLength scripts.
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// This is a lookup array for script_index -> fontname
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using PerFamilyFonts =
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std::array<std::u16string, prefs::kWebKitScriptsForFontFamilyMapsLength>;
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PerFamilyFonts MakeCacheForFamily(const std::string_view family_name) {
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PerFamilyFonts ret;
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for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
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const char* script_name = prefs::kWebKitScriptsForFontFamilyMaps[i];
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ret[i] = base::UTF8ToUTF16(GetDefaultFont(family_name, script_name));
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}
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return ret;
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}
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void FillFontFamilyMap(const PerFamilyFonts& cache,
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blink::web_pref::ScriptFontFamilyMap& font_family_map) {
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for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
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if (const std::u16string& fontname = cache[i]; !fontname.empty()) {
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char const* const script_name = prefs::kWebKitScriptsForFontFamilyMaps[i];
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font_family_map[script_name] = fontname;
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}
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}
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}
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struct FamilyCache {
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std::string_view family_name;
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// where to find the font_family_map in a WebPreferences instance
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blink::web_pref::ScriptFontFamilyMap blink::web_pref::WebPreferences::*
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map_offset;
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PerFamilyFonts fonts = {};
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};
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static auto MakeCache() {
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// the font families whose defaults we want to cache
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std::array<FamilyCache, 5> cache{{
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{prefs::kWebKitStandardFontFamilyMap,
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&blink::web_pref::WebPreferences::standard_font_family_map},
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{prefs::kWebKitFixedFontFamilyMap,
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&blink::web_pref::WebPreferences::fixed_font_family_map},
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{prefs::kWebKitSerifFontFamilyMap,
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&blink::web_pref::WebPreferences::serif_font_family_map},
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{prefs::kWebKitSansSerifFontFamilyMap,
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&blink::web_pref::WebPreferences::sans_serif_font_family_map},
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{prefs::kWebKitCursiveFontFamilyMap,
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&blink::web_pref::WebPreferences::cursive_font_family_map},
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}};
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// populate the cache
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for (FamilyCache& row : cache) {
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row.fonts = MakeCacheForFamily(row.family_name);
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}
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return cache;
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}
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} // namespace
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namespace electron {
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void SetFontDefaults(blink::web_pref::WebPreferences* prefs) {
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static auto const cache = MakeCache();
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for (FamilyCache const& row : cache) {
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FillFontFamilyMap(row.fonts, prefs->*row.map_offset);
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}
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}
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} // namespace electron
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