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gecko-dev/layout/style/FontFaceSet.cpp

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52 KiB
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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=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 "mozilla/Logging.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/CSSFontFaceLoadEvent.h"
#include "mozilla/dom/CSSFontFaceLoadEventBinding.h"
#include "mozilla/dom/FontFaceSetBinding.h"
#include "mozilla/dom/FontFaceSetIterator.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Preferences.h"
#include "mozilla/Snprintf.h"
#include "nsCORSListenerProxy.h"
#include "nsFontFaceLoader.h"
#include "nsIConsoleService.h"
#include "nsIContentPolicy.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsINetworkPredictor.h"
#include "nsIPresShell.h"
#include "nsIPrincipal.h"
#include "nsISupportsPriority.h"
#include "nsIWebNavigation.h"
#include "nsNetUtil.h"
#include "nsPresContext.h"
#include "nsPrintfCString.h"
#include "nsStyleSet.h"
using namespace mozilla;
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_INHERITED(FontFaceSet)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
FontFaceSet::FontFaceSet(nsPIDOMWindow* aWindow, nsPresContext* aPresContext)
: DOMEventTargetHelper(aWindow)
, mPresContext(aPresContext)
, mDocument(aPresContext->Document())
, mStatus(FontFaceSetLoadStatus::Loaded)
, mNonRuleFacesDirty(false)
, mHasLoadingFontFaces(false)
, mHasLoadingFontFacesIsDirty(false)
, mDelayedLoadCheck(false)
{
MOZ_COUNT_CTOR(FontFaceSet);
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aWindow);
// If the pref is not set, don't create the Promise (which the page wouldn't
// be able to get to anyway) as it causes the window.FontFaceSet constructor
// to be created.
if (global && PrefEnabled()) {
ErrorResult rv;
mReady = Promise::Create(global, rv);
}
if (mReady) {
mReady->MaybeResolve(this);
}
if (!mDocument->DidFireDOMContentLoaded()) {
mDocument->AddSystemEventListener(NS_LITERAL_STRING("DOMContentLoaded"),
this, false, false);
}
mDocument->CSSLoader()->AddObserver(this);
mUserFontSet = new UserFontSet(this);
}
FontFaceSet::~FontFaceSet()
{
MOZ_COUNT_DTOR(FontFaceSet);
NS_ASSERTION(mLoaders.Count() == 0, "mLoaders should have been emptied");
Disconnect();
}
JSObject*
FontFaceSet::WrapObject(JSContext* aContext, JS::Handle<JSObject*> aGivenProto)
{
return FontFaceSetBinding::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);
}
}
void
FontFaceSet::RemoveDOMContentLoadedListener()
{
if (mDocument) {
mDocument->RemoveSystemEventListener(NS_LITERAL_STRING("DOMContentLoaded"),
this, false);
}
}
already_AddRefed<Promise>
FontFaceSet::Load(const nsAString& aFont,
const nsAString& aText,
ErrorResult& aRv)
{
aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
return nullptr;
}
bool
FontFaceSet::Check(const nsAString& aFont,
const nsAString& aText,
ErrorResult& aRv)
{
aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
return false;
}
Promise*
FontFaceSet::GetReady(ErrorResult& aRv)
{
if (!mReady) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
mPresContext->FlushUserFontSet();
return mReady;
}
FontFaceSetLoadStatus
FontFaceSet::Status()
{
mPresContext->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
FontFaceSet*
FontFaceSet::Add(FontFace& aFontFace, ErrorResult& aRv)
{
mPresContext->FlushUserFontSet();
// We currently only support FontFace objects being in a single FontFaceSet,
// and we also restrict the FontFaceSet to contain only FontFaces created
// in the same window.
if (aFontFace.GetFontFaceSet() != this) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
if (aFontFace.IsInFontFaceSet()) {
return this;
}
MOZ_ASSERT(!aFontFace.HasRule(),
"rule-backed FontFaces should always be in the FontFaceSet");
bool removed = mUnavailableFaces.RemoveElement(&aFontFace);
if (!removed) {
MOZ_ASSERT(false, "should have found aFontFace in mUnavailableFaces");
return this;
}
aFontFace.SetIsInFontFaceSet(true);
#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->mSheetType = 0; // unused for mNonRuleFaces
rec->mLoadEventShouldFire =
aFontFace.Status() == FontFaceLoadStatus::Unloaded ||
aFontFace.Status() == FontFaceLoadStatus::Loading;
mNonRuleFacesDirty = true;
mPresContext->RebuildUserFontSet();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingStarted();
return this;
}
void
FontFaceSet::Clear()
{
mPresContext->FlushUserFontSet();
if (mNonRuleFaces.IsEmpty()) {
return;
}
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
FontFace* f = mNonRuleFaces[i].mFontFace;
f->SetIsInFontFaceSet(false);
MOZ_ASSERT(!mUnavailableFaces.Contains(f),
"FontFace should not occur in mUnavailableFaces twice");
mUnavailableFaces.AppendElement(f);
}
mNonRuleFaces.Clear();
mNonRuleFacesDirty = true;
mPresContext->RebuildUserFontSet();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingFinished();
}
bool
FontFaceSet::Delete(FontFace& aFontFace)
{
mPresContext->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.SetIsInFontFaceSet(false);
MOZ_ASSERT(!mUnavailableFaces.Contains(&aFontFace),
"FontFace should not occur in mUnavailableFaces twice");
mUnavailableFaces.AppendElement(&aFontFace);
mNonRuleFacesDirty = true;
mPresContext->RebuildUserFontSet();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingFinished();
return true;
}
bool
FontFaceSet::HasAvailableFontFace(FontFace* aFontFace)
{
return aFontFace->GetFontFaceSet() == this &&
aFontFace->IsInFontFaceSet();
}
bool
FontFaceSet::Has(FontFace& aFontFace)
{
mPresContext->FlushUserFontSet();
return HasAvailableFontFace(&aFontFace);
}
FontFace*
FontFaceSet::GetFontFaceAt(uint32_t aIndex)
{
mPresContext->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()
{
mPresContext->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);
}
FontFaceSetIterator*
FontFaceSet::Entries()
{
return new FontFaceSetIterator(this, true);
}
FontFaceSetIterator*
FontFaceSet::Values()
{
return new FontFaceSetIterator(this, false);
}
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++) {
FontFace* face = GetFontFaceAt(i);
aCallback.Call(thisArg, *face, *face, *this, aRv);
if (aRv.Failed()) {
return;
}
}
}
static PLDHashOperator DestroyIterator(nsPtrHashKey<nsFontFaceLoader>* aKey,
void* aUserArg)
{
aKey->GetKey()->Cancel();
return PL_DHASH_REMOVE;
}
void
FontFaceSet::DestroyUserFontSet()
{
Disconnect();
mDocument = nullptr;
mPresContext = nullptr;
mLoaders.EnumerateEntries(DestroyIterator, nullptr);
for (size_t i = 0; i < mRuleFaces.Length(); i++) {
mRuleFaces[i].mFontFace->DisconnectFromRule();
mRuleFaces[i].mFontFace->SetUserFontEntry(nullptr);
}
for (size_t i = 0; i < mNonRuleFaces.Length(); i++) {
mNonRuleFaces[i].mFontFace->SetUserFontEntry(nullptr);
}
for (size_t i = 0; i < mUnavailableFaces.Length(); i++) {
mUnavailableFaces[i]->SetUserFontEntry(nullptr);
}
mRuleFaces.Clear();
mNonRuleFaces.Clear();
mUnavailableFaces.Clear();
mReady = nullptr;
if (mUserFontSet) {
mUserFontSet->mFontFaceSet = nullptr;
}
mUserFontSet = nullptr;
}
void
FontFaceSet::RemoveLoader(nsFontFaceLoader* aLoader)
{
mLoaders.RemoveEntry(aLoader);
}
nsresult
FontFaceSet::StartLoad(gfxUserFontEntry* aUserFontEntry,
const gfxFontFaceSrc* aFontFaceSrc)
{
nsresult rv;
nsIPresShell* ps = mPresContext->PresShell();
if (!ps)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIStreamLoader> streamLoader;
nsCOMPtr<nsILoadGroup> loadGroup(ps->GetDocument()->GetDocumentLoadGroup());
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,
ps->GetDocument(),
aUserFontEntry->GetPrincipal(),
nsILoadInfo::SEC_NORMAL,
nsIContentPolicy::TYPE_FONT,
loadGroup);
NS_ENSURE_SUCCESS(rv, rv);
nsRefPtr<nsFontFaceLoader> fontLoader =
new nsFontFaceLoader(aUserFontEntry, aFontFaceSrc->mURI, this, channel);
if (LOG_ENABLED()) {
nsAutoCString fontURI, referrerURI;
aFontFaceSrc->mURI->GetSpec(fontURI);
if (aFontFaceSrc->mReferrer)
aFontFaceSrc->mReferrer->GetSpec(referrerURI);
LOG(("userfonts (%p) download start - font uri: (%s) "
"referrer uri: (%s)\n",
fontLoader.get(), fontURI.get(), referrerURI.get()));
}
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
if (httpChannel) {
httpChannel->SetReferrerWithPolicy(aFontFaceSrc->mReferrer,
ps->GetDocument()->GetReferrerPolicy());
nsAutoCString accept("application/font-woff;q=0.9,*/*;q=0.8");
if (Preferences::GetBool(GFX_PREF_WOFF2_ENABLED)) {
accept.Insert(NS_LITERAL_CSTRING("application/font-woff2;q=1.0,"), 0);
}
httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
accept, false);
// 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)) {
httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept-Encoding"),
NS_LITERAL_CSTRING("identity"), false);
}
}
nsCOMPtr<nsISupportsPriority> priorityChannel(do_QueryInterface(channel));
if (priorityChannel) {
priorityChannel->AdjustPriority(nsISupportsPriority::PRIORITY_HIGH);
}
rv = NS_NewStreamLoader(getter_AddRefs(streamLoader), fontLoader);
NS_ENSURE_SUCCESS(rv, rv);
nsIDocument *document = ps->GetDocument();
mozilla::net::PredictorLearn(aFontFaceSrc->mURI, document->GetDocumentURI(),
nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE,
loadGroup);
bool inherits = false;
rv = NS_URIChainHasFlags(aFontFaceSrc->mURI,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
&inherits);
if (NS_SUCCEEDED(rv) && inherits) {
// allow data, javascript, etc URI's
rv = channel->AsyncOpen(streamLoader, nullptr);
} else {
nsRefPtr<nsCORSListenerProxy> listener =
new nsCORSListenerProxy(streamLoader, aUserFontEntry->GetPrincipal(), false);
// Doesn't matter what data: URI handling we use here, since we
// don't even use a CORS listener proxy for the data: case.
rv = listener->Init(channel, DataURIHandling::Disallow);
if (NS_SUCCEEDED(rv)) {
rv = channel->AsyncOpen(listener, nullptr);
}
if (NS_FAILED(rv)) {
fontLoader->DropChannel(); // explicitly need to break ref cycle
}
}
if (NS_SUCCEEDED(rv)) {
mLoaders.PutEntry(fontLoader);
fontLoader->StartedLoading(streamLoader);
aUserFontEntry->SetLoader(fontLoader); // let the font entry remember the
// loader, in case we need to cancel it
}
return rv;
}
static PLDHashOperator DetachFontEntries(const nsAString& aKey,
nsRefPtr<gfxUserFontFamily>& aFamily,
void* aUserArg)
{
aFamily->DetachFontEntries();
return PL_DHASH_NEXT;
}
static PLDHashOperator RemoveIfEmpty(const nsAString& aKey,
nsRefPtr<gfxUserFontFamily>& aFamily,
void* aUserArg)
{
return aFamily->GetFontList().Length() ? PL_DHASH_NEXT : PL_DHASH_REMOVE;
}
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<nsCSSFontFaceRule>, 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.)
mUserFontSet->mFontFamilies.Enumerate(DetachFontEntries, nullptr);
// 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<nsCSSFontFaceRule>> 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.
if (handledRules.Contains(aRules[i].mRule)) {
continue;
}
nsCSSFontFaceRule* rule = aRules[i].mRule;
nsRefPtr<FontFace> f = ruleFaceMap.Get(rule);
if (!f.get()) {
f = FontFace::CreateForRule(GetParentObject(), mPresContext, rule);
}
InsertRuleFontFace(f, aRules[i].mSheetType, oldRecords, modified);
handledRules.PutEntry(aRules[i].mRule);
}
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).
mUserFontSet->mFontFamilies.Enumerate(RemoveIfEmpty, nullptr);
// 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) {
nsRefPtr<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.
MOZ_ASSERT(!mUnavailableFaces.Contains(f),
"FontFace should not occur in mUnavailableFaces twice");
mUnavailableFaces.AppendElement(f);
f->DisconnectFromRule();
}
}
if (modified) {
IncrementGeneration(true);
mHasLoadingFontFacesIsDirty = true;
CheckLoadingStarted();
CheckLoadingFinished();
}
// local rules have been rebuilt, so clear the flag
mUserFontSet->mLocalRulesUsed = false;
if (LOG_ENABLED() && !mRuleFaces.IsEmpty()) {
LOG(("userfonts (%p) userfont rules update (%s) rule count: %d",
mUserFontSet.get(),
(modified ? "modified" : "not modified"),
mRuleFaces.Length()));
}
return modified;
}
static bool
HasLocalSrc(const nsCSSValue::Array *aSrcArr)
{
size_t numSrc = aSrcArr->Count();
for (size_t i = 0; i < numSrc; i++) {
if (aSrcArr->Item(i).GetUnit() == eCSSUnit_Local_Font) {
return true;
}
}
return false;
}
void
FontFaceSet::IncrementGeneration(bool aIsRebuild)
{
MOZ_ASSERT(mUserFontSet);
mUserFontSet->IncrementGeneration(aIsRebuild);
}
void
FontFaceSet::InsertNonRuleFontFace(FontFace* aFontFace,
bool& aFontSetModified)
{
nsAutoString fontfamily;
if (!aFontFace->GetFamilyName(fontfamily)) {
// If there is no family name, this rule cannot contribute a
// usable font, so there is no point in processing it further.
return;
}
// 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?
nsRefPtr<gfxUserFontEntry> entry =
FindOrCreateUserFontEntryFromFontFace(fontfamily, aFontFace,
nsStyleSet::eDocSheet);
if (!entry) {
return;
}
aFontFace->SetUserFontEntry(entry);
}
aFontSetModified = true;
mUserFontSet->AddUserFontEntry(fontfamily, aFontFace->GetUserFontEntry());
}
void
FontFaceSet::InsertRuleFontFace(FontFace* aFontFace, uint8_t aSheetType,
nsTArray<FontFaceRecord>& aOldRecords,
bool& aFontSetModified)
{
nsAutoString fontfamily;
if (!aFontFace->GetFamilyName(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;
// 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.mSheetType == aSheetType) {
// if local rules were used, don't use the old font entry
// for rules containing src local usage
if (mUserFontSet->mLocalRulesUsed) {
nsCSSValue val;
aFontFace->GetDesc(eCSSFontDesc_Src, val);
nsCSSUnit unit = val.GetUnit();
if (unit == eCSSUnit_Array && HasLocalSrc(val.GetArrayValue())) {
// 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(fontfamily, 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:
nsRefPtr<gfxUserFontEntry> entry =
FindOrCreateUserFontEntryFromFontFace(fontfamily, 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.mSheetType = 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(fontfamily, entry);
}
already_AddRefed<gfxUserFontEntry>
FontFaceSet::FindOrCreateUserFontEntryFromFontFace(FontFace* aFontFace)
{
nsAutoString fontfamily;
if (!aFontFace->GetFamilyName(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(fontfamily, aFontFace,
nsStyleSet::eDocSheet);
}
already_AddRefed<gfxUserFontEntry>
FontFaceSet::FindOrCreateUserFontEntryFromFontFace(const nsAString& aFamilyName,
FontFace* aFontFace,
uint8_t aSheetType)
{
nsCSSValue val;
nsCSSUnit unit;
uint32_t weight = NS_STYLE_FONT_WEIGHT_NORMAL;
int32_t stretch = NS_STYLE_FONT_STRETCH_NORMAL;
uint32_t italicStyle = NS_STYLE_FONT_STYLE_NORMAL;
uint32_t languageOverride = NO_FONT_LANGUAGE_OVERRIDE;
// set up weight
aFontFace->GetDesc(eCSSFontDesc_Weight, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Integer || unit == eCSSUnit_Enumerated) {
weight = val.GetIntValue();
if (weight == 0) {
weight = NS_STYLE_FONT_WEIGHT_NORMAL;
}
} else if (unit == eCSSUnit_Normal) {
weight = NS_STYLE_FONT_WEIGHT_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face weight has unexpected unit");
}
// set up stretch
aFontFace->GetDesc(eCSSFontDesc_Stretch, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Enumerated) {
stretch = val.GetIntValue();
} else if (unit == eCSSUnit_Normal) {
stretch = NS_STYLE_FONT_STRETCH_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face stretch has unexpected unit");
}
// set up font style
aFontFace->GetDesc(eCSSFontDesc_Style, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Enumerated) {
italicStyle = val.GetIntValue();
} else if (unit == eCSSUnit_Normal) {
italicStyle = NS_STYLE_FONT_STYLE_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face style has unexpected unit");
}
// set up font features
nsTArray<gfxFontFeature> featureSettings;
aFontFace->GetDesc(eCSSFontDesc_FontFeatureSettings, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Normal) {
// empty list of features
} else if (unit == eCSSUnit_PairList || unit == eCSSUnit_PairListDep) {
nsRuleNode::ComputeFontFeatures(val.GetPairListValue(), featureSettings);
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face font-feature-settings has unexpected unit");
}
// set up font language override
aFontFace->GetDesc(eCSSFontDesc_FontLanguageOverride, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Normal) {
// empty feature string
} else if (unit == eCSSUnit_String) {
nsString stringValue;
val.GetStringValue(stringValue);
languageOverride = gfxFontStyle::ParseFontLanguageOverride(stringValue);
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face font-language-override has unexpected unit");
}
// set up unicode-range
nsAutoPtr<gfxCharacterMap> unicodeRanges;
aFontFace->GetDesc(eCSSFontDesc_UnicodeRange, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Array) {
unicodeRanges = new gfxCharacterMap();
const nsCSSValue::Array& sources = *val.GetArrayValue();
MOZ_ASSERT(sources.Count() % 2 == 0,
"odd number of entries in a unicode-range: array");
for (uint32_t i = 0; i < sources.Count(); i += 2) {
uint32_t min = sources[i].GetIntValue();
uint32_t max = sources[i+1].GetIntValue();
unicodeRanges->SetRange(min, max);
}
}
// 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();
} else {
aFontFace->GetDesc(eCSSFontDesc_Src, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Array) {
nsCSSValue::Array* srcArr = val.GetArrayValue();
size_t numSrc = srcArr->Count();
for (size_t i = 0; i < numSrc; i++) {
val = srcArr->Item(i);
unit = val.GetUnit();
gfxFontFaceSrc* face = srcArray.AppendElements(1);
if (!face)
return nullptr;
switch (unit) {
case eCSSUnit_Local_Font:
val.GetStringValue(face->mLocalName);
face->mSourceType = gfxFontFaceSrc::eSourceType_Local;
face->mURI = nullptr;
face->mFormatFlags = 0;
break;
case eCSSUnit_URL:
face->mSourceType = gfxFontFaceSrc::eSourceType_URL;
face->mURI = val.GetURLValue();
face->mReferrer = val.GetURLStructValue()->mReferrer;
face->mReferrerPolicy = mDocument->GetReferrerPolicy();
face->mOriginPrincipal = val.GetURLStructValue()->mOriginPrincipal;
NS_ASSERTION(face->mOriginPrincipal, "null origin principal in @font-face rule");
// 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 = (aSheetType == nsStyleSet::eUserSheet ||
aSheetType == nsStyleSet::eAgentSheet);
face->mLocalName.Truncate();
face->mFormatFlags = 0;
while (i + 1 < numSrc && (val = srcArr->Item(i+1),
val.GetUnit() == eCSSUnit_Font_Format)) {
nsDependentString valueString(val.GetStringBufferValue());
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 {
// 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.RemoveElementAt(srcArray.Length() - 1);
NS_WARNING("null url in @font-face rule");
continue;
}
break;
default:
NS_ASSERTION(unit == eCSSUnit_Local_Font || unit == eCSSUnit_URL,
"strange unit type in font-face src array");
break;
}
}
} else {
NS_ASSERTION(unit == eCSSUnit_Null, "@font-face src has unexpected unit");
}
}
if (srcArray.IsEmpty()) {
return nullptr;
}
nsRefPtr<gfxUserFontEntry> entry =
mUserFontSet->FindOrCreateUserFontEntry(aFamilyName, srcArray, weight,
stretch, italicStyle,
featureSettings,
languageOverride,
unicodeRanges);
return entry.forget();
}
nsCSSFontFaceRule*
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;
}
nsCSSFontFaceRule*
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);
char weightKeywordBuf[8]; // plenty to sprintf() a uint16_t
const char* weightKeyword;
const nsAFlatCString& weightKeywordString =
nsCSSProps::ValueToKeyword(aUserFontEntry->Weight(),
nsCSSProps::kFontWeightKTable);
if (weightKeywordString.Length() > 0) {
weightKeyword = weightKeywordString.get();
} else {
snprintf_literal(weightKeywordBuf, "%u", aUserFontEntry->Weight());
weightKeyword = weightKeywordBuf;
}
nsPrintfCString message
("downloadable font: %s "
"(font-family: \"%s\" style:%s weight:%s stretch:%s src index:%d)",
aMessage,
familyName.get(),
aUserFontEntry->IsItalic() ? "italic" : "normal",
weightKeyword,
nsCSSProps::ValueToKeyword(aUserFontEntry->Stretch(),
nsCSSProps::kFontStretchKTable).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
nsCSSFontFaceRule* rule = FindRuleForUserFontEntry(aUserFontEntry);
nsString href;
nsString text;
nsresult rv;
uint32_t line = 0;
uint32_t column = 0;
if (rule) {
rv = rule->GetCssText(text);
NS_ENSURE_SUCCESS(rv, rv);
CSSStyleSheet* sheet = rule->GetStyleSheet();
// if the style sheet is removed while the font is loading can be null
if (sheet) {
nsAutoCString spec;
rv = sheet->GetSheetURI()->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
CopyUTF8toUTF16(spec, href);
} else {
NS_WARNING("null parent stylesheet for @font-face rule");
href.AssignLiteral("unknown");
}
line = rule->GetLineNumber();
column = rule->GetColumnNumber();
}
nsCOMPtr<nsIScriptError> scriptError =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint64_t innerWindowID = GetPresContext()->Document()->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;
}
nsresult
FontFaceSet::CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
nsIPrincipal** aPrincipal,
bool* aBypassCache)
{
// check same-site origin
nsIPresShell* ps = mPresContext->PresShell();
if (!ps)
return NS_ERROR_FAILURE;
NS_ASSERTION(aFontFaceSrc &&
aFontFaceSrc->mSourceType == gfxFontFaceSrc::eSourceType_URL,
"bad font face url passed to fontloader");
NS_ASSERTION(aFontFaceSrc->mURI, "null font uri");
if (!aFontFaceSrc->mURI)
return NS_ERROR_FAILURE;
// use document principal, original principal if flag set
// this enables user stylesheets to load font files via
// @font-face rules
*aPrincipal = ps->GetDocument()->NodePrincipal();
NS_ASSERTION(aFontFaceSrc->mOriginPrincipal,
"null origin principal in @font-face rule");
if (aFontFaceSrc->mUseOriginPrincipal) {
*aPrincipal = aFontFaceSrc->mOriginPrincipal;
}
nsresult rv = nsFontFaceLoader::CheckLoadAllowed(*aPrincipal,
aFontFaceSrc->mURI,
ps->GetDocument());
if (NS_FAILED(rv)) {
return rv;
}
*aBypassCache = false;
nsCOMPtr<nsIDocShell> docShell = ps->GetDocument()->GetDocShell();
if (docShell) {
uint32_t loadType;
if (NS_SUCCEEDED(docShell->GetLoadType(&loadType))) {
if ((loadType >> 16) & nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE) {
*aBypassCache = true;
}
}
}
return rv;
}
nsresult
FontFaceSet::SyncLoadFontData(gfxUserFontEntry* aFontToLoad,
const gfxFontFaceSrc* aFontFaceSrc,
uint8_t*& aBuffer,
uint32_t& aBufferLength)
{
nsresult rv;
nsCOMPtr<nsIChannel> channel;
nsIPresShell* ps = mPresContext->PresShell();
if (!ps) {
return NS_ERROR_FAILURE;
}
// 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,
ps->GetDocument(),
aFontToLoad->GetPrincipal(),
nsILoadInfo::SEC_NORMAL,
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*> (moz_xmalloc(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;
}
bool
FontFaceSet::GetPrivateBrowsing()
{
nsIPresShell* ps = mPresContext->PresShell();
if (!ps) {
return false;
}
nsCOMPtr<nsILoadContext> loadContext = ps->GetDocument()->GetLoadContext();
return loadContext && loadContext->UsePrivateBrowsing();
}
void
FontFaceSet::DoRebuildUserFontSet()
{
if (!mPresContext) {
// AFAICS, this can only happen if someone has already called Destroy() on
// this font-set, which means it is in the process of being torn down --
// so there's no point trying to update its rules.
return;
}
mPresContext->RebuildUserFontSet();
}
void
FontFaceSet::AddUnavailableFontFace(FontFace* aFontFace)
{
MOZ_ASSERT(!aFontFace->HasRule());
MOZ_ASSERT(!aFontFace->IsInFontFaceSet());
MOZ_ASSERT(!mUnavailableFaces.Contains(aFontFace));
mUnavailableFaces.AppendElement(aFontFace);
}
void
FontFaceSet::RemoveUnavailableFontFace(FontFace* aFontFace)
{
MOZ_ASSERT(!aFontFace->HasRule());
MOZ_ASSERT(!aFontFace->IsInFontFaceSet());
// We might not actually find the FontFace in mUnavailableFaces, since we
// might be shutting down the document and had DestroyUserFontSet called
// on us, which clears out mUnavailableFaces.
mUnavailableFaces.RemoveElement(aFontFace);
MOZ_ASSERT(!mUnavailableFaces.Contains(aFontFace));
}
void
FontFaceSet::OnFontFaceStatusChanged(FontFace* aFontFace)
{
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;
nsCOMPtr<nsIRunnable> checkTask =
NS_NewRunnableMethod(this, &FontFaceSet::CheckLoadingFinishedAfterDelay);
NS_DispatchToMainThread(checkTask);
}
}
}
void
FontFaceSet::DidRefresh()
{
CheckLoadingFinished();
}
void
FontFaceSet::CheckLoadingFinishedAfterDelay()
{
mDelayedLoadCheck = false;
CheckLoadingFinished();
}
void
FontFaceSet::CheckLoadingStarted()
{
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;
(new AsyncEventDispatcher(this, NS_LITERAL_STRING("loading"),
false))->RunDOMEventWhenSafe();
if (PrefEnabled()) {
nsRefPtr<Promise> ready;
if (GetParentObject()) {
ErrorResult rv;
ready = Promise::Create(GetParentObject(), rv);
}
if (ready) {
mReady.swap(ready);
}
}
}
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.
if (mPresContext && mPresContext->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()
{
if (mDelayedLoadCheck) {
// Wait until the runnable posted in OnFontFaceStatusChanged calls us.
return;
}
if (mStatus == FontFaceSetLoadStatus::Loaded) {
// We've already resolved mReady and dispatched the loadingdone/loadingerror
// events.
return;
}
if (MightHavePendingFontLoads()) {
// We're not finished loading yet.
return;
}
mStatus = FontFaceSetLoadStatus::Loaded;
if (mReady) {
mReady->MaybeResolve(this);
}
// Now dispatch the loadingdone/loadingerror events.
nsTArray<FontFace*> loaded;
nsTArray<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"), loaded);
if (!failed.IsEmpty()) {
DispatchLoadingFinishedEvent(NS_LITERAL_STRING("loadingerror"), failed);
}
}
void
FontFaceSet::DispatchLoadingFinishedEvent(
const nsAString& aType,
const nsTArray<FontFace*>& aFontFaces)
{
CSSFontFaceLoadEventInit init;
init.mBubbles = false;
init.mCancelable = false;
OwningNonNull<FontFace>* elements =
init.mFontfaces.AppendElements(aFontFaces.Length(), fallible);
MOZ_ASSERT(elements);
for (size_t i = 0; i < aFontFaces.Length(); i++) {
elements[i] = aFontFaces[i];
}
nsRefPtr<CSSFontFaceLoadEvent> event =
CSSFontFaceLoadEvent::Constructor(this, aType, init);
(new AsyncEventDispatcher(this, event))->RunDOMEventWhenSafe();
}
// nsIDOMEventListener
NS_IMETHODIMP
FontFaceSet::HandleEvent(nsIDOMEvent* 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(mozilla::CSSStyleSheet* aSheet,
bool aWasAlternate,
nsresult aStatus)
{
CheckLoadingFinished();
return NS_OK;
}
// -- FontFaceSet::UserFontSet ------------------------------------------------
/* virtual */ nsresult
FontFaceSet::UserFontSet::CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
nsIPrincipal** aPrincipal,
bool* aBypassCache)
{
if (!mFontFaceSet) {
return NS_ERROR_FAILURE;
}
return mFontFaceSet->CheckFontLoad(aFontFaceSrc, aPrincipal, aBypassCache);
}
/* virtual */ nsresult
FontFaceSet::UserFontSet::StartLoad(gfxUserFontEntry* aUserFontEntry,
const gfxFontFaceSrc* aFontFaceSrc)
{
if (!mFontFaceSet) {
return NS_ERROR_FAILURE;
}
return mFontFaceSet->StartLoad(aUserFontEntry, aFontFaceSrc);
}
/* 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->GetPrivateBrowsing();
}
/* virtual */ void
FontFaceSet::UserFontSet::DoRebuildUserFontSet()
{
if (!mFontFaceSet) {
return;
}
mFontFaceSet->DoRebuildUserFontSet();
}
/* virtual */ already_AddRefed<gfxUserFontEntry>
FontFaceSet::UserFontSet::CreateUserFontEntry(
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges)
{
nsRefPtr<gfxUserFontEntry> entry =
new FontFace::Entry(this, aFontFaceSrcList, aWeight, aStretch, aItalicStyle,
aFeatureSettings, aLanguageOverride, aUnicodeRanges);
return entry.forget();
}
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