349 lines
12 KiB
C++
349 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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_dom_FontFaceSet_h
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#define mozilla_dom_FontFaceSet_h
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#include "mozilla/dom/FontFace.h"
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#include "mozilla/dom/FontFaceSetBinding.h"
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#include "mozilla/DOMEventTargetHelper.h"
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#include "gfxUserFontSet.h"
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#include "nsCSSRules.h"
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#include "nsICSSLoaderObserver.h"
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#include "nsPIDOMWindow.h"
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struct gfxFontFaceSrc;
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class gfxUserFontEntry;
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class nsFontFaceLoader;
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class nsIPrincipal;
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class nsPIDOMWindow;
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namespace mozilla {
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namespace css {
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class FontFamilyListRefCnt;
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} // namespace css
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namespace dom {
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class FontFace;
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class Promise;
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} // namespace dom
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} // namespace mozilla
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namespace mozilla {
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namespace dom {
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class FontFaceSet final : public DOMEventTargetHelper
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, public nsIDOMEventListener
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, public nsICSSLoaderObserver
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{
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friend class UserFontSet;
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public:
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/**
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* A gfxUserFontSet that integrates with the layout and style systems to
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* manage @font-face rules and handle network requests for font loading.
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*
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* We would combine this class and FontFaceSet into the one class if it were
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* possible; it's not because FontFaceSet is cycle collected and
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* gfxUserFontSet isn't (and can't be, as gfx classes don't use the cycle
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* collector). So UserFontSet exists just to override the needed virtual
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* methods from gfxUserFontSet and to forward them on FontFaceSet.
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*/
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class UserFontSet final : public gfxUserFontSet
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{
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friend class FontFaceSet;
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public:
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explicit UserFontSet(FontFaceSet* aFontFaceSet)
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: mFontFaceSet(aFontFaceSet)
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{
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}
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FontFaceSet* GetFontFaceSet() { return mFontFaceSet; }
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virtual nsresult CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
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nsIPrincipal** aPrincipal,
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bool* aBypassCache) override;
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virtual nsresult StartLoad(gfxUserFontEntry* aUserFontEntry,
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const gfxFontFaceSrc* aFontFaceSrc) override;
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void RecordFontLoadDone(uint32_t aFontSize,
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mozilla::TimeStamp aDoneTime) override;
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protected:
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virtual bool GetPrivateBrowsing() override;
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virtual nsresult SyncLoadFontData(gfxUserFontEntry* aFontToLoad,
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const gfxFontFaceSrc* aFontFaceSrc,
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uint8_t*& aBuffer,
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uint32_t& aBufferLength) override;
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virtual nsresult LogMessage(gfxUserFontEntry* aUserFontEntry,
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const char* aMessage,
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uint32_t aFlags = nsIScriptError::errorFlag,
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nsresult aStatus = NS_OK) override;
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virtual void DoRebuildUserFontSet() override;
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virtual already_AddRefed<gfxUserFontEntry> CreateUserFontEntry(
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges) override;
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private:
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RefPtr<FontFaceSet> mFontFaceSet;
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};
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FontFaceSet, DOMEventTargetHelper)
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NS_DECL_NSIDOMEVENTLISTENER
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FontFaceSet(nsPIDOMWindow* aWindow, nsIDocument* aDocument);
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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UserFontSet* GetUserFontSet() { return mUserFontSet; }
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// Called by nsFontFaceLoader when the loader has completed normally.
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// It's removed from the mLoaders set.
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void RemoveLoader(nsFontFaceLoader* aLoader);
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bool UpdateRules(const nsTArray<nsFontFaceRuleContainer>& aRules);
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nsPresContext* GetPresContext();
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// search for @font-face rule that matches a platform font entry
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nsCSSFontFaceRule* FindRuleForEntry(gfxFontEntry* aFontEntry);
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void IncrementGeneration(bool aIsRebuild = false);
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/**
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* Finds an existing entry in the user font cache or creates a new user
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* font entry for the given FontFace object.
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*/
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static already_AddRefed<gfxUserFontEntry>
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FindOrCreateUserFontEntryFromFontFace(FontFace* aFontFace);
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/**
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* Notification method called by a FontFace to indicate that its loading
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* status has changed.
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*/
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void OnFontFaceStatusChanged(FontFace* aFontFace);
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/**
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* Notification method called by the nsPresContext to indicate that the
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* refresh driver ticked and flushed style and layout.
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* were just flushed.
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*/
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void DidRefresh();
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/**
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* Returns whether the "layout.css.font-loading-api.enabled" pref is true.
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*/
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static bool PrefEnabled();
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// nsICSSLoaderObserver
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NS_IMETHOD StyleSheetLoaded(mozilla::CSSStyleSheet* aSheet,
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bool aWasAlternate,
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nsresult aStatus) override;
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FontFace* GetFontFaceAt(uint32_t aIndex);
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void FlushUserFontSet();
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static nsPresContext* GetPresContextFor(gfxUserFontSet* aUserFontSet)
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{
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FontFaceSet* set = static_cast<UserFontSet*>(aUserFontSet)->mFontFaceSet;
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return set ? set->GetPresContext() : nullptr;
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}
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// -- Web IDL --------------------------------------------------------------
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IMPL_EVENT_HANDLER(loading)
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IMPL_EVENT_HANDLER(loadingdone)
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IMPL_EVENT_HANDLER(loadingerror)
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already_AddRefed<mozilla::dom::Promise> Load(JSContext* aCx,
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const nsAString& aFont,
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const nsAString& aText,
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mozilla::ErrorResult& aRv);
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bool Check(const nsAString& aFont,
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const nsAString& aText,
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mozilla::ErrorResult& aRv);
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mozilla::dom::Promise* GetReady(mozilla::ErrorResult& aRv);
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mozilla::dom::FontFaceSetLoadStatus Status();
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FontFaceSet* Add(FontFace& aFontFace, mozilla::ErrorResult& aRv);
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void Clear();
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bool Delete(FontFace& aFontFace);
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bool Has(FontFace& aFontFace);
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uint32_t Size();
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already_AddRefed<mozilla::dom::FontFaceSetIterator> Entries();
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already_AddRefed<mozilla::dom::FontFaceSetIterator> Values();
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void ForEach(JSContext* aCx, FontFaceSetForEachCallback& aCallback,
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JS::Handle<JS::Value> aThisArg,
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mozilla::ErrorResult& aRv);
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private:
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~FontFaceSet();
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/**
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* Returns whether the given FontFace is currently "in" the FontFaceSet.
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*/
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bool HasAvailableFontFace(FontFace* aFontFace);
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/**
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* Removes any listeners and observers.
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*/
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void Disconnect();
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void RemoveDOMContentLoadedListener();
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/**
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* Returns whether there might be any pending font loads, which should cause
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* the mReady Promise not to be resolved yet.
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*/
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bool MightHavePendingFontLoads();
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/**
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* Checks to see whether it is time to replace mReady and dispatch a
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* "loading" event.
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*/
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void CheckLoadingStarted();
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/**
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* Checks to see whether it is time to resolve mReady and dispatch any
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* "loadingdone" and "loadingerror" events.
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*/
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void CheckLoadingFinished();
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/**
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* Callback for invoking CheckLoadingFinished after going through the
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* event loop. See OnFontFaceStatusChanged.
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*/
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void CheckLoadingFinishedAfterDelay();
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/**
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* Dispatches a FontFaceSetLoadEvent to this object.
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*/
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void DispatchLoadingFinishedEvent(
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const nsAString& aType,
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const nsTArray<FontFace*>& aFontFaces);
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// Note: if you add new cycle collected objects to FontFaceRecord,
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// make sure to update FontFaceSet's cycle collection macros
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// accordingly.
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struct FontFaceRecord {
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RefPtr<FontFace> mFontFace;
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SheetType mSheetType; // only relevant for mRuleFaces entries
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// When true, indicates that when finished loading, the FontFace should be
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// included in the subsequent loadingdone/loadingerror event fired at the
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// FontFaceSet.
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bool mLoadEventShouldFire;
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};
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static already_AddRefed<gfxUserFontEntry> FindOrCreateUserFontEntryFromFontFace(
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const nsAString& aFamilyName,
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FontFace* aFontFace,
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SheetType aSheetType);
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// search for @font-face rule that matches a userfont font entry
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nsCSSFontFaceRule* FindRuleForUserFontEntry(gfxUserFontEntry* aUserFontEntry);
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nsresult StartLoad(gfxUserFontEntry* aUserFontEntry,
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const gfxFontFaceSrc* aFontFaceSrc);
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nsresult CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
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nsIPrincipal** aPrincipal,
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bool* aBypassCache);
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bool GetPrivateBrowsing();
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nsresult SyncLoadFontData(gfxUserFontEntry* aFontToLoad,
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const gfxFontFaceSrc* aFontFaceSrc,
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uint8_t*& aBuffer,
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uint32_t& aBufferLength);
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nsresult LogMessage(gfxUserFontEntry* aUserFontEntry,
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const char* aMessage,
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uint32_t aFlags,
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nsresult aStatus);
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void RebuildUserFontSet();
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void InsertRuleFontFace(FontFace* aFontFace, SheetType aSheetType,
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nsTArray<FontFaceRecord>& aOldRecords,
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bool& aFontSetModified);
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void InsertNonRuleFontFace(FontFace* aFontFace, bool& aFontSetModified);
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#ifdef DEBUG
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bool HasRuleFontFace(FontFace* aFontFace);
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#endif
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/**
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* Returns whether we have any loading FontFace objects in the FontFaceSet.
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*/
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bool HasLoadingFontFaces();
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// Helper function for HasLoadingFontFaces.
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void UpdateHasLoadingFontFaces();
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void ParseFontShorthandForMatching(
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const nsAString& aFont,
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RefPtr<mozilla::css::FontFamilyListRefCnt>& aFamilyList,
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uint32_t& aWeight,
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int32_t& aStretch,
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uint8_t& aStyle,
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ErrorResult& aRv);
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void FindMatchingFontFaces(const nsAString& aFont,
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const nsAString& aText,
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nsTArray<FontFace*>& aFontFaces,
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mozilla::ErrorResult& aRv);
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TimeStamp GetNavigationStartTimeStamp();
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RefPtr<UserFontSet> mUserFontSet;
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// The document this is a FontFaceSet for.
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nsCOMPtr<nsIDocument> mDocument;
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// A Promise that is fulfilled once all of the FontFace objects
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// in mRuleFaces and mNonRuleFaces that started or were loading at the
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// time the Promise was created have finished loading. It is rejected if
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// any of those fonts failed to load. mReady is replaced with
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// a new Promise object whenever mReady is settled and another
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// FontFace in mRuleFaces or mNonRuleFaces starts to load.
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RefPtr<mozilla::dom::Promise> mReady;
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// Set of all loaders pointing to us. These are not strong pointers,
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// but that's OK because nsFontFaceLoader always calls RemoveLoader on
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// us before it dies (unless we die first).
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nsTHashtable< nsPtrHashKey<nsFontFaceLoader> > mLoaders;
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// The @font-face rule backed FontFace objects in the FontFaceSet.
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nsTArray<FontFaceRecord> mRuleFaces;
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// The non rule backed FontFace objects that have been added to this
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// FontFaceSet.
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nsTArray<FontFaceRecord> mNonRuleFaces;
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// The overall status of the loading or loaded fonts in the FontFaceSet.
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mozilla::dom::FontFaceSetLoadStatus mStatus;
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// Whether mNonRuleFaces has changed since last time UpdateRules ran.
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bool mNonRuleFacesDirty;
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// Whether any FontFace objects in mRuleFaces or mNonRuleFaces are
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// loading. Only valid when mHasLoadingFontFacesIsDirty is false. Don't use
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// this variable directly; call the HasLoadingFontFaces method instead.
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bool mHasLoadingFontFaces;
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// This variable is only valid when mLoadingDirty is false.
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bool mHasLoadingFontFacesIsDirty;
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// Whether CheckLoadingFinished calls should be ignored. See comment in
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// OnFontFaceStatusChanged.
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bool mDelayedLoadCheck;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // !defined(mozilla_dom_FontFaceSet_h)
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