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FontFaceSet.cpp
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FontFaceSet.cpp
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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 "gfxFontConstants.h"
#include "mozilla/css/Declaration.h"
#include "mozilla/css/Loader.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/AsyncEventDispatcher.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/Snprintf.h"
#include "nsCORSListenerProxy.h"
#include "nsCSSParser.h"
#include "nsDeviceContext.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 "nsIProtocolHandler.h"
#include "nsIInputStream.h"
#include "nsPresContext.h"
#include "nsPrintfCString.h"
#include "nsStyleSet.h"
#include "nsUTF8Utils.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_INHERITED(FontFaceSet)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
FontFaceSet::FontFaceSet(nsPIDOMWindow* aWindow, nsIDocument* aDocument)
: DOMEventTargetHelper(aWindow)
, mDocument(aDocument)
, 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);
Disconnect();
for (auto it = mLoaders.Iter(); !it.Done(); it.Next()) {
it.Get()->GetKey()->Cancel();
}
}
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);
}
}
void
FontFaceSet::ParseFontShorthandForMatching(
const nsAString& aFont,
RefPtr<FontFamilyListRefCnt>& aFamilyList,
uint32_t& aWeight,
int32_t& aStretch,
uint8_t& aStyle,
ErrorResult& aRv)
{
// Parse aFont as a 'font' property value.
Declaration declaration;
declaration.InitializeEmpty();
bool changed = false;
nsCSSParser parser;
parser.ParseProperty(eCSSProperty_font,
aFont,
mDocument->GetDocumentURI(),
mDocument->GetDocumentURI(),
mDocument->NodePrincipal(),
&declaration,
&changed,
/* aIsImportant */ false);
// All of the properties we are interested in should have been set at once.
MOZ_ASSERT(changed == (declaration.HasProperty(eCSSProperty_font_family) &&
declaration.HasProperty(eCSSProperty_font_style) &&
declaration.HasProperty(eCSSProperty_font_weight) &&
declaration.HasProperty(eCSSProperty_font_stretch)));
if (!changed) {
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
nsCSSCompressedDataBlock* data = declaration.GetNormalBlock();
MOZ_ASSERT(!declaration.GetImportantBlock());
const nsCSSValue* family = data->ValueFor(eCSSProperty_font_family);
if (family->GetUnit() != eCSSUnit_FontFamilyList) {
// We got inherit, initial, unset, a system font, or a token stream.
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
aFamilyList =
static_cast<FontFamilyListRefCnt*>(family->GetFontFamilyListValue());
int32_t weight = data->ValueFor(eCSSProperty_font_weight)->GetIntValue();
// Resolve relative font weights against the initial of font-weight
// (normal, which is equivalent to 400).
if (weight == NS_STYLE_FONT_WEIGHT_BOLDER) {
weight = NS_FONT_WEIGHT_BOLD;
} else if (weight == NS_STYLE_FONT_WEIGHT_LIGHTER) {
weight = NS_FONT_WEIGHT_THIN;
}
aWeight = weight;
aStretch = data->ValueFor(eCSSProperty_font_stretch)->GetIntValue();
aStyle = data->ValueFor(eCSSProperty_font_style)->GetIntValue();
}
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<FontFamilyListRefCnt> familyList;
uint32_t weight;
int32_t stretch;
uint8_t 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->GetFontlist()) {
RefPtr<gfxFontFamily> family =
mUserFontSet->LookupFamily(fontFamilyName.mName);
if (!family) {
continue;
}
nsAutoTArray<gfxFontEntry*,4> entries;
bool needsBold;
family->FindAllFontsForStyle(style, entries, needsBold);
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);
}
}
}
}
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;
}
}
nsIGlobalObject* globalObject = GetParentObject();
if (!globalObject) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
JS::Rooted<JSObject*> jsGlobal(aCx, globalObject->GetGlobalJSObject());
GlobalObject global(aCx, jsGlobal);
RefPtr<Promise> result = Promise::All(global, promises, aRv);
return result.forget();
}
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;
}
Promise*
FontFaceSet::GetReady(ErrorResult& aRv)
{
if (!mReady) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
FlushUserFontSet();
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
FontFaceSet*
FontFaceSet::Add(FontFace& aFontFace, ErrorResult& aRv)
{
FlushUserFontSet();
if (aFontFace.IsInFontFaceSet(this)) {
return this;
}
if (aFontFace.HasRule()) {
aRv.Throw(NS_ERROR_DOM_INVALID_MODIFICATION_ERR);
return nullptr;
}
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->mSheetType = SheetType::Unknown; // unused for mNonRuleFaces
rec->mLoadEventShouldFire =
aFontFace.Status() == FontFaceLoadStatus::Unloaded ||
aFontFace.Status() == FontFaceLoadStatus::Loading;
mNonRuleFacesDirty = true;
RebuildUserFontSet();
mHasLoadingFontFacesIsDirty = true;
CheckLoadingStarted();
return this;
}
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;
RebuildUserFontSet();
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;
RebuildUserFontSet();
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++) {
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());
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,
mDocument,
aUserFontEntry->GetPrincipal(),
nsILoadInfo::SEC_NORMAL,
nsIContentPolicy::TYPE_FONT,
loadGroup);
NS_ENSURE_SUCCESS(rv, rv);
RefPtr<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,
mDocument->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);
mozilla::net::PredictorLearn(aFontFaceSrc->mURI, mDocument->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 {
RefPtr<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,
RefPtr<gfxUserFontFamily>& aFamily,
void* aUserArg)
{
aFamily->DetachFontEntries();
return PL_DHASH_NEXT;
}
static PLDHashOperator RemoveIfEmpty(const nsAString& aKey,
RefPtr<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;
RefPtr<FontFace> f = ruleFaceMap.Get(rule);
if (!f.get()) {
f = FontFace::CreateForRule(GetParentObject(), this, 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) {
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();
}
// 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?
RefPtr<gfxUserFontEntry> entry =
FindOrCreateUserFontEntryFromFontFace(fontfamily, aFontFace,
SheetType::Doc);
if (!entry) {
return;
}
aFontFace->SetUserFontEntry(entry);
}
aFontSetModified = true;
mUserFontSet->AddUserFontEntry(fontfamily, aFontFace->GetUserFontEntry());
}
void
FontFaceSet::InsertRuleFontFace(FontFace* aFontFace, SheetType 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:
RefPtr<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,
SheetType::Doc);
}
already_AddRefed<gfxUserFontEntry>
FontFaceSet::FindOrCreateUserFontEntryFromFontFace(const nsAString& aFamilyName,
FontFace* aFontFace,
SheetType aSheetType)
{
nsCSSValue val;
nsCSSUnit unit;
uint32_t weight = NS_STYLE_FONT_WEIGHT_NORMAL;
int32_t stretch = NS_STYLE_FONT_STRETCH_NORMAL;
uint8_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");
}