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d5f76a387b
As discussed on IRC, fixed is only used for prefs right now, and: * We already copy the fixed size to the monospace font. * We already serialize the fixed family as "monospace" in the style system. So it already works somewhat inconsistently. Making it an alias makes it work consistently. Differential Revision: https://phabricator.services.mozilla.com/D24288 --HG-- extra : moz-landing-system : lando
185 lines
6.6 KiB
C++
185 lines
6.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_StaticPresData_h
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#define mozilla_StaticPresData_h
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#include "mozilla/UniquePtr.h"
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#include "nsCoord.h"
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#include "nsCOMPtr.h"
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#include "nsFont.h"
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#include "nsAtom.h"
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#include "nsLanguageAtomService.h"
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namespace mozilla {
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struct LangGroupFontPrefs {
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// Font sizes default to zero; they will be set in GetFontPreferences
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LangGroupFontPrefs()
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: mLangGroup(nullptr),
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mMinimumFontSize(0),
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mDefaultVariableFont(),
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mDefaultSerifFont(StyleGenericFontFamily::Serif, 0),
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mDefaultSansSerifFont(StyleGenericFontFamily::SansSerif, 0),
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mDefaultMonospaceFont(StyleGenericFontFamily::Monospace, 0),
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mDefaultCursiveFont(StyleGenericFontFamily::Cursive, 0),
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mDefaultFantasyFont(StyleGenericFontFamily::Fantasy, 0) {
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mDefaultVariableFont.fontlist.SetDefaultFontType(
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StyleGenericFontFamily::Serif);
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// We create mDefaultVariableFont.fontlist with defaultType as the
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// fallback font, and not as part of the font list proper. This way,
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// it can be overwritten should there be a language change.
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}
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void Reset() {
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// Throw away any other LangGroupFontPrefs objects:
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mNext = nullptr;
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// Make GetFontPreferences reinitialize mLangGroupFontPrefs:
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mLangGroup = nullptr;
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}
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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size_t n = 0;
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LangGroupFontPrefs* curr = mNext.get();
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while (curr) {
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n += aMallocSizeOf(curr);
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// Measurement of the following members may be added later if DMD finds
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// it is worthwhile:
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// - mLangGroup
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// - mDefault*Font
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curr = curr->mNext.get();
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}
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return n;
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}
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// Initialize this with the data for a given language
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void Initialize(nsStaticAtom* aLangGroupAtom);
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/**
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* Get the default font for the given language and generic font ID.
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* aLanguage may not be nullptr.
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*
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* This object is read-only, you must copy the font to modify it.
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*
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* For aFontID corresponding to a CSS Generic, the nsFont returned has
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* its name set to that generic font's name, and its size set to
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* the user's preference for font size for that generic and the
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* given language.
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*/
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const nsFont* GetDefaultFont(StyleGenericFontFamily aFamily) const {
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switch (aFamily) {
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// Special (our default variable width font and fixed width font)
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case StyleGenericFontFamily::None:
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return &mDefaultVariableFont;
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// CSS
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case StyleGenericFontFamily::Serif:
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return &mDefaultSerifFont;
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case StyleGenericFontFamily::SansSerif:
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return &mDefaultSansSerifFont;
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case StyleGenericFontFamily::Monospace:
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return &mDefaultMonospaceFont;
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case StyleGenericFontFamily::Cursive:
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return &mDefaultCursiveFont;
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case StyleGenericFontFamily::Fantasy:
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return &mDefaultFantasyFont;
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("invalid font id");
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return nullptr;
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}
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}
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nsStaticAtom* mLangGroup;
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nscoord mMinimumFontSize;
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nsFont mDefaultVariableFont;
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nsFont mDefaultSerifFont;
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nsFont mDefaultSansSerifFont;
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nsFont mDefaultMonospaceFont;
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nsFont mDefaultCursiveFont;
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nsFont mDefaultFantasyFont;
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mozilla::UniquePtr<LangGroupFontPrefs> mNext;
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};
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/**
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* Some functionality that has historically lived on nsPresContext does not
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* actually need to be per-document. This singleton class serves as a host
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* for that functionality. We delegate to it from nsPresContext where
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* appropriate, and use it standalone in some cases as well.
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*/
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class StaticPresData {
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public:
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// Initialization and shutdown of the singleton. Called exactly once.
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static void Init();
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static void Shutdown();
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// Gets an instance of the singleton. Infallible between the calls to Init
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// and Shutdown.
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static StaticPresData* Get();
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/**
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* Given a language, get the language group name, which can
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* be used as an argument to LangGroupFontPrefs::Initialize()
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*
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* aNeedsToCache is used for two things. If null, it indicates that
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* the nsLanguageAtomService is safe to cache the result of the
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* language group lookup, either because we're on the main thread,
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* or because we're on a style worker thread but the font lock has
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* been acquired. If non-null, it indicates that it's not safe to
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* cache the result of the language group lookup (because we're on
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* a style worker thread without the lock acquired). In this case,
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* GetLanguageGroup will store true in *aNeedsToCache true if we
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* would have cached the result of a new lookup, and false if we
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* were able to use an existing cached result. Thus, callers that
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* get a true *aNeedsToCache outparam value should make an effort
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* to re-call GetLanguageGroup when it is safe to cache, to avoid
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* recomputing the language group again later.
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*/
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nsStaticAtom* GetLangGroup(nsAtom* aLanguage,
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bool* aNeedsToCache = nullptr) const;
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/**
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* Same as GetLangGroup, but will not cache the result
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*/
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nsStaticAtom* GetUncachedLangGroup(nsAtom* aLanguage) const;
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/**
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* Fetch the user's font preferences for the given aLanguage's
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* langugage group.
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*
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* The original code here is pretty old, and includes an optimization
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* whereby language-specific prefs are read per-document, and the
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* results are stored in a linked list, which is assumed to be very short
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* since most documents only ever use one language.
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*
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* Storing this per-session rather than per-document would almost certainly
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* be fine. But just to be on the safe side, we leave the old mechanism as-is,
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* with an additional per-session cache that new callers can use if they don't
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* have a PresContext.
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*
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* See comment on GetLangGroup for the usage of aNeedsToCache.
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*/
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const LangGroupFontPrefs* GetFontPrefsForLang(nsAtom* aLanguage,
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bool* aNeedsToCache = nullptr);
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const nsFont* GetDefaultFont(uint8_t aFontID, nsAtom* aLanguage,
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const LangGroupFontPrefs* aPrefs) const;
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void InvalidateFontPrefs() { mLangGroupFontPrefs.Reset(); }
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private:
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StaticPresData();
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~StaticPresData() = default;
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nsLanguageAtomService* mLangService;
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LangGroupFontPrefs mLangGroupFontPrefs;
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};
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} // namespace mozilla
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#endif // mozilla_StaticPresData_h
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