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gecko-dev
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gecko-dev/layout/style/FontFaceSet.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FontFaceSet.h"
#include "gfxFontConstants.h"
#include "gfxFontSrcPrincipal.h"
#include "gfxFontSrcURI.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/CSSFontFaceRule.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/FontFaceSetBinding.h"
#include "mozilla/dom/FontFaceSetIterator.h"
#include "mozilla/dom/FontFaceSetLoadEvent.h"
#include "mozilla/dom/FontFaceSetLoadEventBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoCSSParser.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/ServoUtils.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticPrefs.h"
#include "mozilla/Telemetry.h"
#include "mozilla/LoadInfo.h"
#include "nsAutoPtr.h"
#include "nsContentPolicyUtils.h"
#include "nsDeviceContext.h"
#include "nsFontFaceLoader.h"
#include "nsIClassOfService.h"
#include "nsIConsoleService.h"
#include "nsIContentPolicy.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDocShell.h"
#include "mozilla/dom/Document.h"
#include "nsILoadContext.h"
#include "nsINetworkPredictor.h"
#include "nsIPresShellInlines.h"
#include "nsIPrincipal.h"
#include "nsISupportsPriority.h"
#include "nsIWebNavigation.h"
#include "nsNetUtil.h"
#include "nsIProtocolHandler.h"
#include "nsIInputStream.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsPrintfCString.h"
#include "nsUTF8Utils.h"
#include "nsDOMNavigationTiming.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
#define LOG(args) \
MOZ_LOG(gfxUserFontSet::GetUserFontsLog(), mozilla::LogLevel::Debug, args)
#define LOG_ENABLED() \
MOZ_LOG_TEST(gfxUserFontSet::GetUserFontsLog(), LogLevel::Debug)
#define FONT_LOADING_API_ENABLED_PREF "layout.css.font-loading-api.enabled"
NS_IMPL_CYCLE_COLLECTION_CLASS(FontFaceSet)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(FontFaceSet,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReady);
for (size_t i = 0; i < tmp->mRuleFaces.Length(); i++) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRuleFaces[i].mFontFace);
}
for (size_t i = 0; i < tmp->mNonRuleFaces.Length(); i++) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNonRuleFaces[i].mFontFace);
}
if (tmp->mUserFontSet) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mUserFontSet->mFontFaceSet);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FontFaceSet,
DOMEventTargetHelper)
tmp->Disconnect();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mReady);
for (size_t i = 0; i < tmp->mRuleFaces.Length(); i++) {
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRuleFaces[i].mFontFace);
}
for (size_t i = 0; i < tmp->mNonRuleFaces.Length(); i++) {
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNonRuleFaces[i].mFontFace);
}
if (tmp->mUserFontSet) {
NS_IMPL_CYCLE_COLLECTION_UNLINK(mUserFontSet->mFontFaceSet);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mUserFontSet);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(FontFaceSet, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(FontFaceSet, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FontFaceSet)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
FontFaceSet::FontFaceSet(nsPIDOMWindowInner* aWindow, dom::Document* aDocument)
: DOMEventTargetHelper(aWindow),
mDocument(aDocument),
mStandardFontLoadPrincipal(
new gfxFontSrcPrincipal(mDocument->NodePrincipal())),
mResolveLazilyCreatedReadyPromise(false),
mStatus(FontFaceSetLoadStatus::Loaded),
mNonRuleFacesDirty(false),
mHasLoadingFontFaces(false),
mHasLoadingFontFacesIsDirty(false),
mDelayedLoadCheck(false),
mBypassCache(false),
mPrivateBrowsing(false) {
MOZ_ASSERT(mDocument, "We should get a valid document from the caller!");
mStandardFontLoadPrincipal =
new gfxFontSrcPrincipal(mDocument->NodePrincipal());
// Record the state of the "bypass cache" flags from the docshell now,
// since we want to look at them from style worker threads, and we can
// only get to the docshell through a weak pointer (which is only
// possible on the main thread).
//
// In theory the load type of a docshell could change after the document
// is loaded, but handling that doesn't seem too important.
if (nsCOMPtr<nsIDocShell> docShell = mDocument->GetDocShell()) {
uint32_t loadType;
uint32_t flags;
if ((NS_SUCCEEDED(docShell->GetLoadType(&loadType)) &&
((loadType >> 16) & nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE)) ||
(NS_SUCCEEDED(docShell->GetDefaultLoadFlags(&flags)) &&
(flags & nsIRequest::LOAD_BYPASS_CACHE))) {
mBypassCache = true;
}
}
// Same for the "private browsing" flag.
if (nsCOMPtr<nsILoadContext> loadContext = mDocument->GetLoadContext()) {
mPrivateBrowsing = loadContext->UsePrivateBrowsing();
}
if (!mDocument->DidFireDOMContentLoaded()) {
mDocument->AddSystemEventListener(NS_LITERAL_STRING("DOMContentLoaded"),
this, false, false);
} else {
// In some cases we can't rely on CheckLoadingFinished being called from
// the refresh driver. For example, documents in display:none iframes.
// Or if the document has finished loading and painting at the time that
// script requests document.fonts and causes us to get here.
CheckLoadingFinished();
}
mDocument->CSSLoader()->AddObserver(this);
mUserFontSet = new UserFontSet(this);
}
FontFaceSet::~FontFaceSet() {
// Assert that we don't drop any FontFaceSet objects during a Servo traversal,
// since PostTraversalTask objects can hold raw pointers to FontFaceSets.
MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal());
Disconnect();
}
JSObject* FontFaceSet::WrapObject(JSContext* aContext,
JS::Handle<JSObject*> aGivenProto) {
return FontFaceSet_Binding::Wrap(aContext, this, aGivenProto);
}
void FontFaceSet::Disconnect() {
RemoveDOMContentLoadedListener();
if (mDocument && mDocument->CSSLoader()) {
// We're null checking CSSLoader() since FontFaceSet::Disconnect() might be
// being called during unlink, at which time the loader amy already have
// been unlinked from the document.
mDocument->CSSLoader()->RemoveObserver(this);
}
for (auto it = mLoaders.Iter(); !it.Done(); it.Next()) {
it.Get()->GetKey()->Cancel();
}
mLoaders.Clear();
}
void FontFaceSet::RemoveDOMContentLoadedListener() {
if (mDocument) {
mDocument->RemoveSystemEventListener(NS_LITERAL_STRING("DOMContentLoaded"),
this, false);
}
}
void FontFaceSet::ParseFontShorthandForMatching(
const nsAString& aFont, RefPtr<SharedFontList>& aFamilyList,
FontWeight& aWeight, FontStretch& aStretch, FontSlantStyle& aStyle,
ErrorResult& aRv) {
StyleComputedFontStyleDescriptor style;
float stretch;
float weight;
// FIXME(emilio): This Servo -> nsCSSValue -> Gecko conversion is stupid,
// Servo understands the font types.
RefPtr<URLExtraData> url = ServoCSSParser::GetURLExtraData(mDocument);
if (!ServoCSSParser::ParseFontShorthandForMatching(aFont, url, aFamilyList,
style, stretch, weight)) {
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
switch (style.tag) {
case StyleComputedFontStyleDescriptor::Tag::Normal:
aStyle = FontSlantStyle::Normal();
break;
case StyleComputedFontStyleDescriptor::Tag::Italic:
aStyle = FontSlantStyle::Italic();
break;
case StyleComputedFontStyleDescriptor::Tag::Oblique:
MOZ_ASSERT(style.AsOblique()._0 == style.AsOblique()._1,
"We use ComputedFontStyleDescriptor just for convenience, "
"the two values should always match");
aStyle = FontSlantStyle::Oblique(style.AsOblique()._0);
break;
}
aWeight = FontWeight(weight);
aStretch = FontStretch::FromStyle(stretch);
}
static bool HasAnyCharacterInUnicodeRange(gfxUserFontEntry* aEntry,
const nsAString& aInput) {
const char16_t* p = aInput.Data();
const char16_t* end = p + aInput.Length();
while (p < end) {
uint32_t c = UTF16CharEnumerator::NextChar(&p, end);
if (aEntry->CharacterInUnicodeRange(c)) {
return true;
}
}
return false;
}
void FontFaceSet::FindMatchingFontFaces(const nsAString& aFont,
const nsAString& aText,
nsTArray<FontFace*>& aFontFaces,
ErrorResult& aRv) {
RefPtr<SharedFontList> familyList;
FontWeight weight;
FontStretch stretch;
FontSlantStyle italicStyle;
ParseFontShorthandForMatching(aFont, familyList, weight, stretch, italicStyle,
aRv);
if (aRv.Failed()) {
return;
}
gfxFontStyle style;
style.style = italicStyle;
style.weight = weight;
style.stretch = stretch;
nsTArray<FontFaceRecord>* arrays[2];
arrays[0] = &mNonRuleFaces;
arrays[1] = &mRuleFaces;
// Set of FontFaces that we want to return.
nsTHashtable<nsPtrHashKey<FontFace>> matchingFaces;
for (const FontFamilyName& fontFamilyName : familyList->mNames) {
if (!fontFamilyName.IsNamed()) {
continue;
}
RefPtr<gfxFontFamily> family =
mUserFontSet->LookupFamily(nsAtomCString(fontFamilyName.mName));
if (!family) {
continue;
}
AutoTArray<gfxFontEntry*, 4> entries;
family->FindAllFontsForStyle(style, entries);
for (gfxFontEntry* e : entries) {
FontFace::Entry* entry = static_cast<FontFace::Entry*>(e);
if (HasAnyCharacterInUnicodeRange(entry, aText)) {
for (FontFace* f : entry->GetFontFaces()) {
matchingFaces.PutEntry(f);
}
}
}
}
// Add all FontFaces in matchingFaces to aFontFaces, in the order
// they appear in the FontFaceSet.
for (nsTArray<FontFaceRecord>* array : arrays) {
for (FontFaceRecord& record : *array) {
FontFace* f = record.mFontFace;
if (matchingFaces.Contains(f)) {
aFontFaces.AppendElement(f);
}
}
}
}
TimeStamp FontFaceSet::GetNavigationStartTimeStamp() {
TimeStamp navStart;
RefPtr<nsDOMNavigationTiming> timing(mDocument->GetNavigationTiming());
if (timing) {
navStart = timing->GetNavigationStartTimeStamp();
}
return navStart;
}
already_AddRefed<Promise> FontFaceSet::Load(JSContext* aCx,
const nsAString& aFont,
const nsAString& aText,
ErrorResult& aRv) {
FlushUserFontSet();
nsTArray<RefPtr<Promise>> promises;
nsTArray<FontFace*> faces;
FindMatchingFontFaces(aFont, aText, faces, aRv);
if (aRv.Failed()) {
return nullptr;
}
for (FontFace* f : faces) {
RefPtr<Promise> promise = f->Load(aRv);
if (aRv.Failed()) {
return nullptr;
}
if (!promises.AppendElement(promise, fallible)) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
return Promise::All(aCx, promises, aRv);
}
bool FontFaceSet::Check(const nsAString& aFont, const nsAString& aText,
ErrorResult& aRv) {
FlushUserFontSet();
nsTArray<FontFace*> faces;
FindMatchingFontFaces(aFont, aText, faces, aRv);
if (aRv.Failed()) {
return false;
}
for (FontFace* f : faces) {
if (f->Status() != FontFaceLoadStatus::Loaded) {
return false;
}
}
return true;
}
bool FontFaceSet::ReadyPromiseIsPending() const {
return mReady ? mReady->State() == Promise::PromiseState::Pending
: !mResolveLazilyCreatedReadyPromise;
}
Promise* FontFaceSet::GetReady(ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
// There may be outstanding style changes that will trigger the loading of
// new fonts. We need to flush layout to initiate any such loads so that
// if mReady is currently resolved we replace it with a new pending Promise.
// (That replacement will happen under this flush call.)
if (!ReadyPromiseIsPending() && mDocument) {
mDocument->FlushPendingNotifications(FlushType::Layout);
}
if (!mReady) {
nsCOMPtr<nsIGlobalObject> global = GetParentObject();
mReady = Promise::Create(global, aRv);
if (!mReady) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
if (mResolveLazilyCreatedReadyPromise) {
mReady->MaybeResolve(this);
mResolveLazilyCreatedReadyPromise = false;
}
}
return mReady;
}
FontFaceSetLoadStatus FontFaceSet::Status() {
FlushUserFontSet();
return mStatus;
}
#ifdef DEBUG
bool FontFaceSet::HasRuleFontFace(FontFace* aFontFace) {
for (size_t i = 0; i < mRuleFaces.Length(); i++) {
if (mRuleFaces[i].mFontFace == aFontFace) {
return true;
}
}
return false;
}
#endif
static bool IsPdfJs(nsIPrincipal* aPrincipal) {
if (!aPrincipal) {
return false;
}
nsCOMPtr<nsIURI> uri;
aPrincipal->GetURI(getter_AddRefs(uri));
return uri && uri->GetSpecOrDefault().EqualsLiteral(
"resource://pdf.js/web/viewer.html");
}
void FontFaceSet::Add(FontFace& aFontFace, ErrorResult& aRv) {
FlushUserFontSet();
if (aFontFace.IsInFontFaceSet(this)) {
return;
}
if (aFontFace.HasRule()) {
aRv.Throw(NS_ERROR_DOM_INVALID_MODIFICATION_ERR);
return;
}
aFontFace.AddFontFaceSet(this);
#ifdef DEBUG
for (const FontFaceRecord& rec : mNonRuleFaces) {
MOZ_ASSERT(rec.mFontFace != &aFontFace,
"FontFace should not occur in mNonRuleFaces twice");
}
#endif
FontFaceRecord* rec = mNonRuleFaces.AppendElement();
rec->mFontFace = &aFontFace;
rec->mOrigin = Nothing();
rec->mLoadEventShouldFire =
aFontFace.Status() == FontFaceLoadStatus::Unloaded ||
aFontFace.Status() == FontFaceLoadStatus::Loading;
mNonRuleFacesDirty = true;
MarkUserFontSetDirty();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingStarted();
RefPtr<dom::Document> clonedDoc = mDocument->GetLatestStaticClone();
if (clonedDoc) {
// The document is printing, copy the font to the static clone as well.
nsCOMPtr<nsIPrincipal> principal = mDocument->GetPrincipal();
if (principal->IsSystemPrincipal() || IsPdfJs(principal)) {
ErrorResult rv;
clonedDoc->Fonts()->Add(aFontFace, rv);
MOZ_ASSERT(!rv.Failed());
}
}
}
void FontFaceSet::Clear() {
FlushUserFontSet();
if (mNonRuleFaces.IsEmpty()) {
return;
}
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
FontFace* f = mNonRuleFaces[i].mFontFace;
f->RemoveFontFaceSet(this);
}
mNonRuleFaces.Clear();
mNonRuleFacesDirty = true;
MarkUserFontSetDirty();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingFinished();
}
bool FontFaceSet::Delete(FontFace& aFontFace) {
FlushUserFontSet();
if (aFontFace.HasRule()) {
return false;
}
bool removed = false;
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
if (mNonRuleFaces[i].mFontFace == &aFontFace) {
mNonRuleFaces.RemoveElementAt(i);
removed = true;
break;
}
}
if (!removed) {
return false;
}
aFontFace.RemoveFontFaceSet(this);
mNonRuleFacesDirty = true;
MarkUserFontSetDirty();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingFinished();
return true;
}
bool FontFaceSet::HasAvailableFontFace(FontFace* aFontFace) {
return aFontFace->IsInFontFaceSet(this);
}
bool FontFaceSet::Has(FontFace& aFontFace) {
FlushUserFontSet();
return HasAvailableFontFace(&aFontFace);
}
FontFace* FontFaceSet::GetFontFaceAt(uint32_t aIndex) {
FlushUserFontSet();
if (aIndex < mRuleFaces.Length()) {
return mRuleFaces[aIndex].mFontFace;
}
aIndex -= mRuleFaces.Length();
if (aIndex < mNonRuleFaces.Length()) {
return mNonRuleFaces[aIndex].mFontFace;
}
return nullptr;
}
uint32_t FontFaceSet::Size() {
FlushUserFontSet();
// Web IDL objects can only expose array index properties up to INT32_MAX.
size_t total = mRuleFaces.Length() + mNonRuleFaces.Length();
return std::min<size_t>(total, INT32_MAX);
}
already_AddRefed<FontFaceSetIterator> FontFaceSet::Entries() {
RefPtr<FontFaceSetIterator> it = new FontFaceSetIterator(this, true);
return it.forget();
}
already_AddRefed<FontFaceSetIterator> FontFaceSet::Values() {
RefPtr<FontFaceSetIterator> it = new FontFaceSetIterator(this, false);
return it.forget();
}
void FontFaceSet::ForEach(JSContext* aCx, FontFaceSetForEachCallback& aCallback,
JS::Handle<JS::Value> aThisArg, ErrorResult& aRv) {
JS::Rooted<JS::Value> thisArg(aCx, aThisArg);
for (size_t i = 0; i < Size(); i++) {
RefPtr<FontFace> face = GetFontFaceAt(i);
aCallback.Call(thisArg, *face, *face, *this, aRv);
if (aRv.Failed()) {
return;
}
}
}
void FontFaceSet::RemoveLoader(nsFontFaceLoader* aLoader) {
mLoaders.RemoveEntry(aLoader);
}
nsresult FontFaceSet::StartLoad(gfxUserFontEntry* aUserFontEntry,
const gfxFontFaceSrc* aFontFaceSrc) {
nsresult rv;
nsCOMPtr<nsIStreamLoader> streamLoader;
nsCOMPtr<nsILoadGroup> loadGroup(mDocument->GetDocumentLoadGroup());
gfxFontSrcPrincipal* principal = aUserFontEntry->GetPrincipal();
nsCOMPtr<nsIChannel> channel;
// Note we are calling NS_NewChannelWithTriggeringPrincipal() with both a
// node and a principal. This is because the document where the font is
// being loaded might have a different origin from the principal of the
// stylesheet that initiated the font load.
rv = NS_NewChannelWithTriggeringPrincipal(
getter_AddRefs(channel), aFontFaceSrc->mURI->get(), mDocument,
principal ? principal->get() : nullptr,
nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS, nsIContentPolicy::TYPE_FONT,
nullptr, // PerformanceStorage
loadGroup);
NS_ENSURE_SUCCESS(rv, rv);
RefPtr<nsFontFaceLoader> fontLoader = new nsFontFaceLoader(
aUserFontEntry, aFontFaceSrc->mURI->get(), this, channel);
mLoaders.PutEntry(fontLoader);
if (LOG_ENABLED()) {
LOG(
("userfonts (%p) download start - font uri: (%s) "
"referrer uri: (%s)\n",
fontLoader.get(), aFontFaceSrc->mURI->GetSpecOrDefault().get(),
aFontFaceSrc->mReferrer
? aFontFaceSrc->mReferrer->GetSpecOrDefault().get()
: ""));
}
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
if (httpChannel) {
rv = httpChannel->SetReferrerWithPolicy(aFontFaceSrc->mReferrer,
aFontFaceSrc->mReferrerPolicy);
Unused << NS_WARN_IF(NS_FAILED(rv));
nsAutoCString accept("application/font-woff;q=0.9,*/*;q=0.8");
if (Preferences::GetBool(GFX_PREF_WOFF2_ENABLED)) {
accept.InsertLiteral("application/font-woff2;q=1.0,", 0);
}
rv = httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"), accept,
false);
NS_ENSURE_SUCCESS(rv, rv);
// For WOFF and WOFF2, we should tell servers/proxies/etc NOT to try
// and apply additional compression at the content-encoding layer
if (aFontFaceSrc->mFormatFlags & (gfxUserFontSet::FLAG_FORMAT_WOFF |
gfxUserFontSet::FLAG_FORMAT_WOFF2)) {
rv = httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept-Encoding"),
NS_LITERAL_CSTRING("identity"), false);
NS_ENSURE_SUCCESS(rv, rv);
}
}
nsCOMPtr<nsISupportsPriority> priorityChannel(do_QueryInterface(channel));
if (priorityChannel) {
priorityChannel->AdjustPriority(nsISupportsPriority::PRIORITY_HIGH);
}
nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel));
if (cos) {
cos->AddClassFlags(nsIClassOfService::TailForbidden);
}
rv = NS_NewStreamLoader(getter_AddRefs(streamLoader), fontLoader, fontLoader);
NS_ENSURE_SUCCESS(rv, rv);
mozilla::net::PredictorLearn(
aFontFaceSrc->mURI->get(), mDocument->GetDocumentURI(),
nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, loadGroup);
rv = channel->AsyncOpen(streamLoader);
if (NS_FAILED(rv)) {
fontLoader->DropChannel(); // explicitly need to break ref cycle
}
if (NS_SUCCEEDED(rv)) {
fontLoader->StartedLoading(streamLoader);
// let the font entry remember the loader, in case we need to cancel it
aUserFontEntry->SetLoader(fontLoader);
}
return rv;
}
bool FontFaceSet::UpdateRules(const nsTArray<nsFontFaceRuleContainer>& aRules) {
MOZ_ASSERT(mUserFontSet);
// If there was a change to the mNonRuleFaces array, then there could
// have been a modification to the user font set.
bool modified = mNonRuleFacesDirty;
mNonRuleFacesDirty = false;
// reuse existing FontFace objects mapped to rules already
nsDataHashtable<nsPtrHashKey<RawServoFontFaceRule>, FontFace*> ruleFaceMap;
for (size_t i = 0, i_end = mRuleFaces.Length(); i < i_end; ++i) {
FontFace* f = mRuleFaces[i].mFontFace;
if (!f) {
continue;
}
ruleFaceMap.Put(f->GetRule(), f);
}
// The @font-face rules that make up the user font set have changed,
// so we need to update the set. However, we want to preserve existing
// font entries wherever possible, so that we don't discard and then
// re-download resources in the (common) case where at least some of the
// same rules are still present.
nsTArray<FontFaceRecord> oldRecords;
mRuleFaces.SwapElements(oldRecords);
// Remove faces from the font family records; we need to re-insert them
// because we might end up with faces in a different order even if they're
// the same font entries as before. (The order can affect font selection
// where multiple faces match the requested style, perhaps with overlapping
// unicode-range coverage.)
for (auto it = mUserFontSet->mFontFamilies.Iter(); !it.Done(); it.Next()) {
it.Data()->DetachFontEntries();
}
// Sometimes aRules has duplicate @font-face rules in it; we should make
// that not happen, but in the meantime, don't try to insert the same
// FontFace object more than once into mRuleFaces. We track which
// ones we've handled in this table.
nsTHashtable<nsPtrHashKey<RawServoFontFaceRule>> handledRules;
for (size_t i = 0, i_end = aRules.Length(); i < i_end; ++i) {
// Insert each FontFace objects for each rule into our list, migrating old
// font entries if possible rather than creating new ones; set modified to
// true if we detect that rule ordering has changed, or if a new entry is
// created.
RawServoFontFaceRule* rule = aRules[i].mRule;
if (!handledRules.EnsureInserted(rule)) {
// rule was already present in the hashtable
continue;
}
RefPtr<FontFace> f = ruleFaceMap.Get(rule);
if (!f.get()) {
f = FontFace::CreateForRule(GetParentObject(), this, rule);
}
InsertRuleFontFace(f, aRules[i].mOrigin, oldRecords, modified);
}
for (size_t i = 0, i_end = mNonRuleFaces.Length(); i < i_end; ++i) {
// Do the same for the non rule backed FontFace objects.
InsertNonRuleFontFace(mNonRuleFaces[i].mFontFace, modified);
}
// Remove any residual families that have no font entries (i.e., they were
// not defined at all by the updated set of @font-face rules).
for (auto it = mUserFontSet->mFontFamilies.Iter(); !it.Done(); it.Next()) {
if (it.Data()->GetFontList().IsEmpty()) {
it.Remove();
}
}
// If any FontFace objects for rules are left in the old list, note that the
// set has changed (even if the new set was built entirely by migrating old
// font entries).
if (oldRecords.Length() > 0) {
modified = true;
// Any in-progress loaders for obsolete rules should be cancelled,
// as the resource being downloaded will no longer be required.
// We need to explicitly remove any loaders here, otherwise the loaders
// will keep their "orphaned" font entries alive until they complete,
// even after the oldRules array is deleted.
//
// XXX Now that it is possible for the author to hold on to a rule backed
// FontFace object, we shouldn't cancel loading here; instead we should do
// it when the FontFace is GCed, if we can detect that.
size_t count = oldRecords.Length();
for (size_t i = 0; i < count; ++i) {
RefPtr<FontFace> f = oldRecords[i].mFontFace;
gfxUserFontEntry* userFontEntry = f->GetUserFontEntry();
if (userFontEntry) {
nsFontFaceLoader* loader = userFontEntry->GetLoader();
if (loader) {
loader->Cancel();
RemoveLoader(loader);
}
}
// Any left over FontFace objects should also cease being rule backed.
f->DisconnectFromRule();
}
}
if (modified) {
IncrementGeneration(true);
mHasLoadingFontFacesIsDirty = true;
CheckLoadingStarted();
CheckLoadingFinished();
}
// if local rules needed to be rebuilt, they have been rebuilt at this point
if (mUserFontSet->mRebuildLocalRules) {
mUserFontSet->mLocalRulesUsed = false;
mUserFontSet->mRebuildLocalRules = false;
}
if (LOG_ENABLED() && !mRuleFaces.IsEmpty()) {
LOG(("userfonts (%p) userfont rules update (%s) rule count: %d",
mUserFontSet.get(), (modified ? "modified" : "not modified"),
(int)(mRuleFaces.Length())));
}
return modified;
}
void FontFaceSet::IncrementGeneration(bool aIsRebuild) {
MOZ_ASSERT(mUserFontSet);
mUserFontSet->IncrementGeneration(aIsRebuild);
}
void FontFaceSet::InsertNonRuleFontFace(FontFace* aFontFace,
bool& aFontSetModified) {
nsAtom* fontFamily = aFontFace->GetFamilyName();
if (!fontFamily) {
// If there is no family name, this rule cannot contribute a
// usable font, so there is no point in processing it further.
return;
}
nsAtomCString family(fontFamily);
// Just create a new font entry if we haven't got one already.
if (!aFontFace->GetUserFontEntry()) {
// XXX Should we be checking mUserFontSet->mLocalRulesUsed like
// InsertRuleFontFace does?
RefPtr<gfxUserFontEntry> entry = FindOrCreateUserFontEntryFromFontFace(
family, aFontFace, StyleOrigin::Author);
if (!entry) {
return;
}
aFontFace->SetUserFontEntry(entry);
}
aFontSetModified = true;
mUserFontSet->AddUserFontEntry(family, aFontFace->GetUserFontEntry());
}
void FontFaceSet::InsertRuleFontFace(FontFace* aFontFace,
StyleOrigin aSheetType,
nsTArray<FontFaceRecord>& aOldRecords,
bool& aFontSetModified) {
nsAtom* fontFamily = aFontFace->GetFamilyName();
if (!fontFamily) {
// If there is no family name, this rule cannot contribute a
// usable font, so there is no point in processing it further.
return;
}
bool remove = false;
size_t removeIndex;
nsAtomCString family(fontFamily);
// This is a rule backed FontFace. First, we check in aOldRecords; if
// the FontFace for the rule exists there, just move it to the new record
// list, and put the entry into the appropriate family.
for (size_t i = 0; i < aOldRecords.Length(); ++i) {
FontFaceRecord& rec = aOldRecords[i];
if (rec.mFontFace == aFontFace && rec.mOrigin == Some(aSheetType)) {
// if local rules were used, don't use the old font entry
// for rules containing src local usage
if (mUserFontSet->mLocalRulesUsed && mUserFontSet->mRebuildLocalRules) {
if (aFontFace->HasLocalSrc()) {
// Remove the old record, but wait to see if we successfully create a
// new user font entry below.
remove = true;
removeIndex = i;
break;
}
}
gfxUserFontEntry* entry = rec.mFontFace->GetUserFontEntry();
MOZ_ASSERT(entry, "FontFace should have a gfxUserFontEntry by now");
mUserFontSet->AddUserFontEntry(family, entry);
MOZ_ASSERT(!HasRuleFontFace(rec.mFontFace),
"FontFace should not occur in mRuleFaces twice");
mRuleFaces.AppendElement(rec);
aOldRecords.RemoveElementAt(i);
// note the set has been modified if an old rule was skipped to find
// this one - something has been dropped, or ordering changed
if (i > 0) {
aFontSetModified = true;
}
return;
}
}
// this is a new rule:
RefPtr<gfxUserFontEntry> entry =
FindOrCreateUserFontEntryFromFontFace(family, aFontFace, aSheetType);
if (!entry) {
return;
}
if (remove) {
// Although we broke out of the aOldRecords loop above, since we found
// src local usage, and we're not using the old user font entry, we still
// are adding a record to mRuleFaces with the same FontFace object.
// Remove the old record so that we don't have the same FontFace listed
// in both mRuleFaces and oldRecords, which would cause us to call
// DisconnectFromRule on a FontFace that should still be rule backed.
aOldRecords.RemoveElementAt(removeIndex);
}
FontFaceRecord rec;
rec.mFontFace = aFontFace;
rec.mOrigin = Some(aSheetType);
rec.mLoadEventShouldFire =
aFontFace->Status() == FontFaceLoadStatus::Unloaded ||
aFontFace->Status() == FontFaceLoadStatus::Loading;
aFontFace->SetUserFontEntry(entry);
MOZ_ASSERT(!HasRuleFontFace(aFontFace),
"FontFace should not occur in mRuleFaces twice");
mRuleFaces.AppendElement(rec);
// this was a new rule and font entry, so note that the set was modified
aFontSetModified = true;
// Add the entry to the end of the list. If an existing userfont entry was
// returned by FindOrCreateUserFontEntryFromFontFace that was already stored
// on the family, gfxUserFontFamily::AddFontEntry(), which AddUserFontEntry
// calls, will automatically remove the earlier occurrence of the same
// userfont entry.
mUserFontSet->AddUserFontEntry(family, entry);
}
/* static */
already_AddRefed<gfxUserFontEntry>
FontFaceSet::FindOrCreateUserFontEntryFromFontFace(FontFace* aFontFace) {
nsAtom* fontFamily = aFontFace->GetFamilyName();
if (!fontFamily) {
// If there is no family name, this rule cannot contribute a
// usable font, so there is no point in processing it further.
return nullptr;
}
return FindOrCreateUserFontEntryFromFontFace(nsAtomCString(fontFamily),
aFontFace, StyleOrigin::Author);
}
static WeightRange GetWeightRangeForDescriptor(
const Maybe<StyleComputedFontWeightRange>& aVal,
gfxFontEntry::RangeFlags& aRangeFlags) {
if (!aVal) {
aRangeFlags |= gfxFontEntry::RangeFlags::eAutoWeight;
return WeightRange(FontWeight::Normal());
}
return WeightRange(FontWeight(aVal->_0), FontWeight(aVal->_1));
}
static SlantStyleRange GetStyleRangeForDescriptor(
const Maybe<StyleComputedFontStyleDescriptor>& aVal,
gfxFontEntry::RangeFlags& aRangeFlags) {
if (!aVal) {
aRangeFlags |= gfxFontEntry::RangeFlags::eAutoSlantStyle;
return SlantStyleRange(FontSlantStyle::Normal());
}
auto& val = *aVal;
switch (val.tag) {
case StyleComputedFontStyleDescriptor::Tag::Normal:
return SlantStyleRange(FontSlantStyle::Normal());
case StyleComputedFontStyleDescriptor::Tag::Italic:
return SlantStyleRange(FontSlantStyle::Italic());
case StyleComputedFontStyleDescriptor::Tag::Oblique:
return SlantStyleRange(FontSlantStyle::Oblique(val.AsOblique()._0),
FontSlantStyle::Oblique(val.AsOblique()._1));
}
MOZ_ASSERT_UNREACHABLE("How?");
return SlantStyleRange(FontSlantStyle::Normal());
}
static StretchRange GetStretchRangeForDescriptor(
const Maybe<StyleComputedFontStretchRange>& aVal,
gfxFontEntry::RangeFlags& aRangeFlags) {
if (!aVal) {
aRangeFlags |= gfxFontEntry::RangeFlags::eAutoStretch;
return StretchRange(FontStretch::Normal());
}
return StretchRange(FontStretch::FromStyle(aVal->_0),
FontStretch::FromStyle(aVal->_1));
}
// TODO(emilio): Should this take an nsAtom* aFamilyName instead?
//
// All callers have one handy.
/* static */
already_AddRefed<gfxUserFontEntry>
FontFaceSet::FindOrCreateUserFontEntryFromFontFace(
const nsACString& aFamilyName, FontFace* aFontFace, StyleOrigin aOrigin) {
FontFaceSet* set = aFontFace->GetPrimaryFontFaceSet();
uint32_t languageOverride = NO_FONT_LANGUAGE_OVERRIDE;
StyleFontDisplay fontDisplay = StyleFontDisplay::Auto;
gfxFontEntry::RangeFlags rangeFlags = gfxFontEntry::RangeFlags::eNoFlags;
// set up weight
WeightRange weight =
GetWeightRangeForDescriptor(aFontFace->GetFontWeight(), rangeFlags);
// set up stretch
StretchRange stretch =
GetStretchRangeForDescriptor(aFontFace->GetFontStretch(), rangeFlags);
// set up font style
SlantStyleRange italicStyle =
GetStyleRangeForDescriptor(aFontFace->GetFontStyle(), rangeFlags);
// set up font display
if (Maybe<StyleFontDisplay> display = aFontFace->GetFontDisplay()) {
fontDisplay = *display;
}
// set up font features
nsTArray<gfxFontFeature> featureSettings;
aFontFace->GetFontFeatureSettings(featureSettings);
// set up font variations
nsTArray<gfxFontVariation> variationSettings;
aFontFace->GetFontVariationSettings(variationSettings);
// set up font language override
if (Maybe<StyleFontLanguageOverride> descriptor =
aFontFace->GetFontLanguageOverride()) {
languageOverride = descriptor->_0;
}
// set up unicode-range
gfxCharacterMap* unicodeRanges = aFontFace->GetUnicodeRangeAsCharacterMap();
// set up src array
nsTArray<gfxFontFaceSrc> srcArray;
if (aFontFace->HasFontData()) {
gfxFontFaceSrc* face = srcArray.AppendElement();
if (!face) return nullptr;
face->mSourceType = gfxFontFaceSrc::eSourceType_Buffer;
face->mBuffer = aFontFace->CreateBufferSource();
face->mReferrerPolicy = mozilla::net::RP_Unset;
} else {
AutoTArray<StyleFontFaceSourceListComponent, 8> sourceListComponents;
aFontFace->GetSources(sourceListComponents);
size_t len = sourceListComponents.Length();
for (size_t i = 0; i < len; ++i) {
gfxFontFaceSrc* face = srcArray.AppendElement();
const auto& component = sourceListComponents[i];
switch (component.tag) {
case StyleFontFaceSourceListComponent::Tag::Local: {
nsAtom* atom = component.AsLocal();
face->mLocalName.Append(nsAtomCString(atom));
face->mSourceType = gfxFontFaceSrc::eSourceType_Local;
face->mURI = nullptr;
face->mFormatFlags = 0;
face->mReferrerPolicy = mozilla::net::RP_Unset;
break;
}
case StyleFontFaceSourceListComponent::Tag::Url: {
face->mSourceType = gfxFontFaceSrc::eSourceType_URL;
const URLValue* url = component.AsUrl();
nsIURI* uri = url->GetURI();
face->mURI = uri ? new gfxFontSrcURI(uri) : nullptr;
URLExtraData* extraData = url->ExtraData();
face->mReferrer = extraData->GetReferrer();
face->mReferrerPolicy = extraData->GetReferrerPolicy();
face->mOriginPrincipal =
new gfxFontSrcPrincipal(extraData->Principal());
// agent and user stylesheets are treated slightly differently,
// the same-site origin check and access control headers are
// enforced against the sheet principal rather than the document
// principal to allow user stylesheets to include @font-face rules
face->mUseOriginPrincipal =
aOrigin == StyleOrigin::User || aOrigin == StyleOrigin::UserAgent;
face->mLocalName.Truncate();
face->mFormatFlags = 0;
while (i + 1 < len) {
const auto& maybeFontFormat = sourceListComponents[i + 1];
if (maybeFontFormat.tag !=
StyleFontFaceSourceListComponent::Tag::FormatHint) {
break;
}
nsDependentCSubstring valueString(
reinterpret_cast<const char*>(
maybeFontFormat.format_hint.utf8_bytes),
maybeFontFormat.format_hint.length);
if (valueString.LowerCaseEqualsASCII("woff")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_WOFF;
} else if (Preferences::GetBool(GFX_PREF_WOFF2_ENABLED) &&
valueString.LowerCaseEqualsASCII("woff2")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_WOFF2;
} else if (valueString.LowerCaseEqualsASCII("opentype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_OPENTYPE;
} else if (valueString.LowerCaseEqualsASCII("truetype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_TRUETYPE;
} else if (valueString.LowerCaseEqualsASCII("truetype-aat")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_TRUETYPE_AAT;
} else if (valueString.LowerCaseEqualsASCII("embedded-opentype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_EOT;
} else if (valueString.LowerCaseEqualsASCII("svg")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_SVG;
} else if (StaticPrefs::layout_css_font_variations_enabled() &&
valueString.LowerCaseEqualsASCII("woff-variations")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_WOFF_VARIATIONS;
} else if (StaticPrefs::layout_css_font_variations_enabled() &&
Preferences::GetBool(GFX_PREF_WOFF2_ENABLED) &&
valueString.LowerCaseEqualsASCII("woff2-variations")) {
face->mFormatFlags |=
gfxUserFontSet::FLAG_FORMAT_WOFF2_VARIATIONS;
} else if (StaticPrefs::layout_css_font_variations_enabled() &&
valueString.LowerCaseEqualsASCII(
"opentype-variations")) {
face->mFormatFlags |=
gfxUserFontSet::FLAG_FORMAT_OPENTYPE_VARIATIONS;
} else if (StaticPrefs::layout_css_font_variations_enabled() &&
valueString.LowerCaseEqualsASCII(
"truetype-variations")) {
face->mFormatFlags |=
gfxUserFontSet::FLAG_FORMAT_TRUETYPE_VARIATIONS;
} else {
// unknown format specified, mark to distinguish from the
// case where no format hints are specified
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_UNKNOWN;
}
i++;
}
if (!face->mURI) {
// if URI not valid, omit from src array
srcArray.RemoveLastElement();
NS_WARNING("null url in @font-face rule");
continue;
}
break;
}
case StyleFontFaceSourceListComponent::Tag::FormatHint:
MOZ_ASSERT_UNREACHABLE(
"Should always come after a URL source, and be consumed already");
break;
}
}
}
if (srcArray.IsEmpty()) {
return nullptr;
}
RefPtr<gfxUserFontEntry> entry = set->mUserFontSet->FindOrCreateUserFontEntry(
aFamilyName, srcArray, weight, stretch, italicStyle, featureSettings,
variationSettings, languageOverride, unicodeRanges, fontDisplay,
rangeFlags);
return entry.forget();
}
RawServoFontFaceRule* FontFaceSet::FindRuleForEntry(gfxFontEntry* aFontEntry) {
NS_ASSERTION(!aFontEntry->mIsUserFontContainer, "only platform font entries");
for (uint32_t i = 0; i < mRuleFaces.Length(); ++i) {
FontFace* f = mRuleFaces[i].mFontFace;
gfxUserFontEntry* entry = f->GetUserFontEntry();
if (entry && entry->GetPlatformFontEntry() == aFontEntry) {
return f->GetRule();
}
}
return nullptr;
}
RawServoFontFaceRule* FontFaceSet::FindRuleForUserFontEntry(
gfxUserFontEntry* aUserFontEntry) {
for (uint32_t i = 0; i < mRuleFaces.Length(); ++i) {
FontFace* f = mRuleFaces[i].mFontFace;
if (f->GetUserFontEntry() == aUserFontEntry) {
return f->GetRule();
}
}
return nullptr;
}
nsresult FontFaceSet::LogMessage(gfxUserFontEntry* aUserFontEntry,
const char* aMessage, uint32_t aFlags,
nsresult aStatus) {
nsCOMPtr<nsIConsoleService> console(
do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (!console) {
return NS_ERROR_NOT_AVAILABLE;
}
nsAutoCString familyName;
nsAutoCString fontURI;
aUserFontEntry->GetFamilyNameAndURIForLogging(familyName, fontURI);
nsAutoCString weightString;
aUserFontEntry->Weight().ToString(weightString);
nsAutoCString stretchString;
aUserFontEntry->Stretch().ToString(stretchString);
nsPrintfCString message(
"downloadable font: %s "
"(font-family: \"%s\" style:%s weight:%s stretch:%s src index:%d)",
aMessage, familyName.get(),
aUserFontEntry->IsItalic() ? "italic" : "normal", // XXX todo: oblique?
weightString.get(), stretchString.get(), aUserFontEntry->GetSrcIndex());
if (NS_FAILED(aStatus)) {
message.AppendLiteral(": ");
switch (aStatus) {
case NS_ERROR_DOM_BAD_URI:
message.AppendLiteral("bad URI or cross-site access not allowed");
break;
case NS_ERROR_CONTENT_BLOCKED:
message.AppendLiteral("content blocked");
break;
default:
message.AppendLiteral("status=");
message.AppendInt(static_cast<uint32_t>(aStatus));
break;
}
}
message.AppendLiteral(" source: ");
message.Append(fontURI);
if (LOG_ENABLED()) {
LOG(("userfonts (%p) %s", mUserFontSet.get(), message.get()));
}
// try to give the user an indication of where the rule came from
RawServoFontFaceRule* rule = FindRuleForUserFontEntry(aUserFontEntry);
nsString href;
nsString text;
uint32_t line = 0;
uint32_t column = 0;
if (rule) {
Servo_FontFaceRule_GetCssText(rule, &text);
Servo_FontFaceRule_GetSourceLocation(rule, &line, &column);
// FIXME We need to figure out an approach to get the style sheet
// of this raw rule. See bug 1450903.
#if 0
StyleSheet* sheet = rule->GetStyleSheet();
// if the style sheet is removed while the font is loading can be null
if (sheet) {
nsCString spec = sheet->GetSheetURI()->GetSpecOrDefault();
CopyUTF8toUTF16(spec, href);
} else {
NS_WARNING("null parent stylesheet for @font-face rule");
href.AssignLiteral("unknown");
}
#endif
href.AssignLiteral("unknown");
}
nsresult rv;
nsCOMPtr<nsIScriptError> scriptError =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint64_t innerWindowID = mDocument->InnerWindowID();
rv = scriptError->InitWithWindowID(NS_ConvertUTF8toUTF16(message),
href, // file
text, // src line
line, column,
aFlags, // flags
"CSS Loader", // category (make separate?)
innerWindowID);
if (NS_SUCCEEDED(rv)) {
console->LogMessage(scriptError);
}
return NS_OK;
}
void FontFaceSet::CacheFontLoadability() {
if (!mUserFontSet) {
return;
}
// TODO(emilio): We could do it a bit more incrementally maybe?
for (auto iter = mUserFontSet->mFontFamilies.Iter(); !iter.Done();
iter.Next()) {
for (const gfxFontEntry* entry : iter.Data()->GetFontList()) {
if (!entry->mIsUserFontContainer) {
continue;
}
const auto& sourceList =
static_cast<const gfxUserFontEntry*>(entry)->SourceList();
for (const gfxFontFaceSrc& src : sourceList) {
if (src.mSourceType != gfxFontFaceSrc::eSourceType_URL) {
continue;
}
mAllowedFontLoads.LookupForAdd(&src).OrInsert(
[&] { return IsFontLoadAllowed(src); });
}
}
}
}
bool FontFaceSet::IsFontLoadAllowed(const gfxFontFaceSrc& aSrc) {
MOZ_ASSERT(aSrc.mSourceType == gfxFontFaceSrc::eSourceType_URL);
if (ServoStyleSet::IsInServoTraversal()) {
bool* entry = mAllowedFontLoads.GetValue(&aSrc);
MOZ_DIAGNOSTIC_ASSERT(entry, "Missed an update?");
return entry ? *entry : false;
}
MOZ_ASSERT(NS_IsMainThread());
if (!mUserFontSet) {
return false;
}
gfxFontSrcPrincipal* gfxPrincipal = aSrc.mURI->InheritsSecurityContext()
? nullptr
: aSrc.LoadPrincipal(*mUserFontSet);
nsIPrincipal* principal = gfxPrincipal ? gfxPrincipal->get() : nullptr;
nsCOMPtr<nsILoadInfo> secCheckLoadInfo = new net::LoadInfo(
mDocument->NodePrincipal(), // loading principal
principal, // triggering principal
mDocument, nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK,
nsIContentPolicy::TYPE_FONT);
int16_t shouldLoad = nsIContentPolicy::ACCEPT;
nsresult rv = NS_CheckContentLoadPolicy(aSrc.mURI->get(), secCheckLoadInfo,
EmptyCString(), // mime type
&shouldLoad,
nsContentUtils::GetContentPolicy());
return NS_SUCCEEDED(rv) && NS_CP_ACCEPTED(shouldLoad);
}
void FontFaceSet::DispatchFontLoadViolations(
nsTArray<nsCOMPtr<nsIRunnable>>& aViolations) {
if (XRE_IsContentProcess()) {
nsCOMPtr<nsIEventTarget> eventTarget =
mDocument->EventTargetFor(TaskCategory::Other);
for (nsIRunnable* runnable : aViolations) {
eventTarget->Dispatch(do_AddRef(runnable), NS_DISPATCH_NORMAL);
}
} else {
for (nsIRunnable* runnable : aViolations) {
NS_DispatchToMainThread(do_AddRef(runnable));
}
}
}
nsresult FontFaceSet::SyncLoadFontData(gfxUserFontEntry* aFontToLoad,
const gfxFontFaceSrc* aFontFaceSrc,
uint8_t*& aBuffer,
uint32_t& aBufferLength) {
nsresult rv;
gfxFontSrcPrincipal* principal = aFontToLoad->GetPrincipal();
nsCOMPtr<nsIChannel> channel;
// Note we are calling NS_NewChannelWithTriggeringPrincipal() with both a
// node and a principal. This is because the document where the font is
// being loaded might have a different origin from the principal of the
// stylesheet that initiated the font load.
// Further, we only get here for data: loads, so it doesn't really matter
// whether we use SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS or not, to be more
// restrictive we use SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS.
rv = NS_NewChannelWithTriggeringPrincipal(
getter_AddRefs(channel), aFontFaceSrc->mURI->get(), mDocument,
principal ? principal->get() : nullptr,
nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS,
nsIContentPolicy::TYPE_FONT);
NS_ENSURE_SUCCESS(rv, rv);
// blocking stream is OK for data URIs
nsCOMPtr<nsIInputStream> stream;
rv = channel->Open(getter_AddRefs(stream));
NS_ENSURE_SUCCESS(rv, rv);
uint64_t bufferLength64;
rv = stream->Available(&bufferLength64);
NS_ENSURE_SUCCESS(rv, rv);
if (bufferLength64 == 0) {
return NS_ERROR_FAILURE;
}
if (bufferLength64 > UINT32_MAX) {
return NS_ERROR_FILE_TOO_BIG;
}
aBufferLength = static_cast<uint32_t>(bufferLength64);
// read all the decoded data
aBuffer = static_cast<uint8_t*>(malloc(sizeof(uint8_t) * aBufferLength));
if (!aBuffer) {
aBufferLength = 0;
return NS_ERROR_OUT_OF_MEMORY;
}
uint32_t numRead, totalRead = 0;
while (NS_SUCCEEDED(
rv = stream->Read(reinterpret_cast<char*>(aBuffer + totalRead),
aBufferLength - totalRead, &numRead)) &&
numRead != 0) {
totalRead += numRead;
if (totalRead > aBufferLength) {
rv = NS_ERROR_FAILURE;
break;
}
}
// make sure there's a mime type
if (NS_SUCCEEDED(rv)) {
nsAutoCString mimeType;
rv = channel->GetContentType(mimeType);
aBufferLength = totalRead;
}
if (NS_FAILED(rv)) {
free(aBuffer);
aBuffer = nullptr;
aBufferLength = 0;
return rv;
}
return NS_OK;
}
void FontFaceSet::OnFontFaceStatusChanged(FontFace* aFontFace) {
AssertIsMainThreadOrServoFontMetricsLocked();
MOZ_ASSERT(HasAvailableFontFace(aFontFace));
mHasLoadingFontFacesIsDirty = true;
if (aFontFace->Status() == FontFaceLoadStatus::Loading) {
CheckLoadingStarted();
} else {
MOZ_ASSERT(aFontFace->Status() == FontFaceLoadStatus::Loaded ||
aFontFace->Status() == FontFaceLoadStatus::Error);
// When a font finishes downloading, nsPresContext::UserFontSetUpdated
// will be called immediately afterwards to request a reflow of the
// relevant elements in the document. We want to wait until the reflow
// request has been done before the FontFaceSet is marked as Loaded so
// that we don't briefly set the FontFaceSet to Loaded and then Loading
// again once the reflow is pending. So we go around the event loop
// and call CheckLoadingFinished() after the reflow has been queued.
if (!mDelayedLoadCheck) {
mDelayedLoadCheck = true;
DispatchCheckLoadingFinishedAfterDelay();
}
}
}
void FontFaceSet::DispatchCheckLoadingFinishedAfterDelay() {
AssertIsMainThreadOrServoFontMetricsLocked();
if (ServoStyleSet* set = ServoStyleSet::Current()) {
// See comments in Gecko_GetFontMetrics.
//
// We can't just dispatch the runnable below if we're not on the main
// thread, since it needs to take a strong reference to the FontFaceSet,
// and being a DOM object, FontFaceSet doesn't support thread-safe
// refcounting.
set->AppendTask(
PostTraversalTask::DispatchFontFaceSetCheckLoadingFinishedAfterDelay(
this));
return;
}
nsCOMPtr<nsIRunnable> checkTask =
NewRunnableMethod("dom::FontFaceSet::CheckLoadingFinishedAfterDelay",
this, &FontFaceSet::CheckLoadingFinishedAfterDelay);
mDocument->Dispatch(TaskCategory::Other, checkTask.forget());
}
void FontFaceSet::DidRefresh() { CheckLoadingFinished(); }
void FontFaceSet::CheckLoadingFinishedAfterDelay() {
mDelayedLoadCheck = false;
CheckLoadingFinished();
}
void FontFaceSet::CheckLoadingStarted() {
AssertIsMainThreadOrServoFontMetricsLocked();
if (!HasLoadingFontFaces()) {
return;
}
if (mStatus == FontFaceSetLoadStatus::Loading) {
// We have already dispatched a loading event and replaced mReady
// with a fresh, unresolved promise.
return;
}
mStatus = FontFaceSetLoadStatus::Loading;
DispatchLoadingEventAndReplaceReadyPromise();
}
void FontFaceSet::DispatchLoadingEventAndReplaceReadyPromise() {
AssertIsMainThreadOrServoFontMetricsLocked();
if (ServoStyleSet* set = ServoStyleSet::Current()) {
// See comments in Gecko_GetFontMetrics.
//
// We can't just dispatch the runnable below if we're not on the main
// thread, since it needs to take a strong reference to the FontFaceSet,
// and being a DOM object, FontFaceSet doesn't support thread-safe
// refcounting. (Also, the Promise object creation must be done on
// the main thread.)
set->AppendTask(
PostTraversalTask::DispatchLoadingEventAndReplaceReadyPromise(this));
return;
}
(new AsyncEventDispatcher(this, NS_LITERAL_STRING("loading"), CanBubble::eNo))
->PostDOMEvent();
if (PrefEnabled()) {
if (mReady && mReady->State() != Promise::PromiseState::Pending) {
if (GetParentObject()) {
ErrorResult rv;
mReady = Promise::Create(GetParentObject(), rv);
}
}
// We may previously have been in a state where all fonts had finished
// loading and we'd set mResolveLazilyCreatedReadyPromise to make sure that
// if we lazily create mReady for a consumer that we resolve it before
// returning it. We're now loading fonts, so we need to clear that flag.
mResolveLazilyCreatedReadyPromise = false;
}
}
void FontFaceSet::UpdateHasLoadingFontFaces() {
mHasLoadingFontFacesIsDirty = false;
mHasLoadingFontFaces = false;
for (size_t i = 0; i < mRuleFaces.Length(); i++) {
FontFace* f = mRuleFaces[i].mFontFace;
if (f->Status() == FontFaceLoadStatus::Loading) {
mHasLoadingFontFaces = true;
return;
}
}
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
if (mNonRuleFaces[i].mFontFace->Status() == FontFaceLoadStatus::Loading) {
mHasLoadingFontFaces = true;
return;
}
}
}
bool FontFaceSet::HasLoadingFontFaces() {
if (mHasLoadingFontFacesIsDirty) {
UpdateHasLoadingFontFaces();
}
return mHasLoadingFontFaces;
}
bool FontFaceSet::MightHavePendingFontLoads() {
// Check for FontFace objects in the FontFaceSet that are still loading.
if (HasLoadingFontFaces()) {
return true;
}
// Check for pending restyles or reflows, as they might cause fonts to
// load as new styles apply and text runs are rebuilt.
nsPresContext* presContext = GetPresContext();
if (presContext && presContext->HasPendingRestyleOrReflow()) {
return true;
}
if (mDocument) {
// We defer resolving mReady until the document as fully loaded.
if (!mDocument->DidFireDOMContentLoaded()) {
return true;
}
// And we also wait for any CSS style sheets to finish loading, as their
// styles might cause new fonts to load.
if (mDocument->CSSLoader()->HasPendingLoads()) {
return true;
}
}
return false;
}
void FontFaceSet::CheckLoadingFinished() {
MOZ_ASSERT(NS_IsMainThread());
if (mDelayedLoadCheck) {
// Wait until the runnable posted in OnFontFaceStatusChanged calls us.
return;
}
if (!ReadyPromiseIsPending()) {
// We've already resolved mReady (or set the flag to do that lazily) and
// dispatched the loadingdone/loadingerror events.
return;
}
if (MightHavePendingFontLoads()) {
// We're not finished loading yet.
return;
}
mStatus = FontFaceSetLoadStatus::Loaded;
if (mReady) {
mReady->MaybeResolve(this);
} else {
mResolveLazilyCreatedReadyPromise = true;
}
// Now dispatch the loadingdone/loadingerror events.
nsTArray<OwningNonNull<FontFace>> loaded;
nsTArray<OwningNonNull<FontFace>> failed;
for (size_t i = 0; i < mRuleFaces.Length(); i++) {
if (!mRuleFaces[i].mLoadEventShouldFire) {
continue;
}
FontFace* f = mRuleFaces[i].mFontFace;
if (f->Status() == FontFaceLoadStatus::Loaded) {
loaded.AppendElement(*f);
mRuleFaces[i].mLoadEventShouldFire = false;
} else if (f->Status() == FontFaceLoadStatus::Error) {
failed.AppendElement(*f);
mRuleFaces[i].mLoadEventShouldFire = false;
}
}
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
if (!mNonRuleFaces[i].mLoadEventShouldFire) {
continue;
}
FontFace* f = mNonRuleFaces[i].mFontFace;
if (f->Status() == FontFaceLoadStatus::Loaded) {
loaded.AppendElement(*f);
mNonRuleFaces[i].mLoadEventShouldFire = false;
} else if (f->Status() == FontFaceLoadStatus::Error) {
failed.AppendElement(*f);
mNonRuleFaces[i].mLoadEventShouldFire = false;
}
}
DispatchLoadingFinishedEvent(NS_LITERAL_STRING("loadingdone"),
std::move(loaded));
if (!failed.IsEmpty()) {
DispatchLoadingFinishedEvent(NS_LITERAL_STRING("loadingerror"),
std::move(failed));
}
}
void FontFaceSet::DispatchLoadingFinishedEvent(
const nsAString& aType, nsTArray<OwningNonNull<FontFace>>&& aFontFaces) {
FontFaceSetLoadEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mFontfaces.SwapElements(aFontFaces);
RefPtr<FontFaceSetLoadEvent> event =
FontFaceSetLoadEvent::Constructor(this, aType, init);
(new AsyncEventDispatcher(this, event))->PostDOMEvent();
}
// nsIDOMEventListener
NS_IMETHODIMP
FontFaceSet::HandleEvent(Event* aEvent) {
nsString type;
aEvent->GetType(type);
if (!type.EqualsLiteral("DOMContentLoaded")) {
return NS_ERROR_FAILURE;
}
RemoveDOMContentLoadedListener();
CheckLoadingFinished();
return NS_OK;
}
/* static */
bool FontFaceSet::PrefEnabled() {
static bool initialized = false;
static bool enabled;
if (!initialized) {
initialized = true;
Preferences::AddBoolVarCache(&enabled, FONT_LOADING_API_ENABLED_PREF);
}
return enabled;
}
// nsICSSLoaderObserver
NS_IMETHODIMP
FontFaceSet::StyleSheetLoaded(StyleSheet* aSheet, bool aWasDeferred,
nsresult aStatus) {
CheckLoadingFinished();
return NS_OK;
}
void FontFaceSet::FlushUserFontSet() {
if (mDocument) {
mDocument->FlushUserFontSet();
}
}
void FontFaceSet::MarkUserFontSetDirty() {
if (mDocument) {
// Ensure we trigger at least a style flush, that will eventually flush the
// user font set. Otherwise the font loads that that flush may cause could
// never be triggered.
if (PresShell* presShell = mDocument->GetPresShell()) {
presShell->EnsureStyleFlush();
}
mDocument->MarkUserFontSetDirty();
}
}
nsPresContext* FontFaceSet::GetPresContext() {
if (!mDocument) {
return nullptr;
}
return mDocument->GetPresContext();
}
void FontFaceSet::RefreshStandardFontLoadPrincipal() {
MOZ_ASSERT(NS_IsMainThread());
mStandardFontLoadPrincipal =
new gfxFontSrcPrincipal(mDocument->NodePrincipal());
mAllowedFontLoads.Clear();
if (mUserFontSet) {
mUserFontSet->IncrementGeneration(false);
}
}
void FontFaceSet::CopyNonRuleFacesTo(FontFaceSet* aFontFaceSet) const {
for (const FontFaceRecord& rec : mNonRuleFaces) {
ErrorResult rv;
RefPtr<FontFace> f = rec.mFontFace;
aFontFaceSet->Add(*f, rv);
MOZ_ASSERT(!rv.Failed());
}
}
// -- FontFaceSet::UserFontSet ------------------------------------------------
/* virtual */
bool FontFaceSet::UserFontSet::IsFontLoadAllowed(const gfxFontFaceSrc& aSrc) {
return mFontFaceSet && mFontFaceSet->IsFontLoadAllowed(aSrc);
}
/* virtual */
void FontFaceSet::UserFontSet::DispatchFontLoadViolations(
nsTArray<nsCOMPtr<nsIRunnable>>& aViolations) {
if (mFontFaceSet) {
mFontFaceSet->DispatchFontLoadViolations(aViolations);
}
}
/* virtual */
nsresult FontFaceSet::UserFontSet::StartLoad(
gfxUserFontEntry* aUserFontEntry, const gfxFontFaceSrc* aFontFaceSrc) {
if (!mFontFaceSet) {
return NS_ERROR_FAILURE;
}
return mFontFaceSet->StartLoad(aUserFontEntry, aFontFaceSrc);
}
void FontFaceSet::UserFontSet::RecordFontLoadDone(uint32_t aFontSize,
TimeStamp aDoneTime) {
mDownloadCount++;
mDownloadSize += aFontSize;
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE, aFontSize / 1024);
if (!mFontFaceSet) {
return;
}
TimeStamp navStart = mFontFaceSet->GetNavigationStartTimeStamp();
TimeStamp zero;
if (navStart != zero) {
Telemetry::AccumulateTimeDelta(Telemetry::WEBFONT_DOWNLOAD_TIME_AFTER_START,
navStart, aDoneTime);
}
}
/* virtual */
nsresult FontFaceSet::UserFontSet::LogMessage(gfxUserFontEntry* aUserFontEntry,
const char* aMessage,
uint32_t aFlags,
nsresult aStatus) {
if (!mFontFaceSet) {
return NS_ERROR_FAILURE;
}
return mFontFaceSet->LogMessage(aUserFontEntry, aMessage, aFlags, aStatus);
}
/* virtual */
nsresult FontFaceSet::UserFontSet::SyncLoadFontData(
gfxUserFontEntry* aFontToLoad, const gfxFontFaceSrc* aFontFaceSrc,
uint8_t*& aBuffer, uint32_t& aBufferLength) {
if (!mFontFaceSet) {
return NS_ERROR_FAILURE;
}
return mFontFaceSet->SyncLoadFontData(aFontToLoad, aFontFaceSrc, aBuffer,
aBufferLength);
}
/* virtual */
bool FontFaceSet::UserFontSet::GetPrivateBrowsing() {
return mFontFaceSet && mFontFaceSet->mPrivateBrowsing;
}
/* virtual */
void FontFaceSet::UserFontSet::DoRebuildUserFontSet() {
if (!mFontFaceSet) {
return;
}
mFontFaceSet->MarkUserFontSetDirty();
}
/* virtual */
already_AddRefed<gfxUserFontEntry>
FontFaceSet::UserFontSet::CreateUserFontEntry(
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList, WeightRange aWeight,
StretchRange aStretch, SlantStyleRange aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
const nsTArray<gfxFontVariation>& aVariationSettings,
uint32_t aLanguageOverride, gfxCharacterMap* aUnicodeRanges,
StyleFontDisplay aFontDisplay, RangeFlags aRangeFlags) {
RefPtr<gfxUserFontEntry> entry = new FontFace::Entry(
this, aFontFaceSrcList, aWeight, aStretch, aStyle, aFeatureSettings,
aVariationSettings, aLanguageOverride, aUnicodeRanges, aFontDisplay,
aRangeFlags);
return entry.forget();
}
#undef LOG_ENABLED
#undef LOG
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