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gecko-dev/gfx/thebes/gfxUserFontSet.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 "mozilla/Logging.h"
#include "gfxUserFontSet.h"
#include "gfxPlatform.h"
#include "gfxPrefs.h"
#include "nsContentPolicyUtils.h"
#include "nsUnicharUtils.h"
#include "nsNetUtil.h"
#include "nsIJARChannel.h"
#include "nsIProtocolHandler.h"
#include "nsIPrincipal.h"
#include "nsIZipReader.h"
#include "gfxFontConstants.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/Telemetry.h"
#include "mozilla/gfx/2D.h"
#include "gfxPlatformFontList.h"
#include "opentype-sanitiser.h"
#include "ots-memory-stream.h"
using namespace mozilla;
mozilla::LogModule*
gfxUserFontSet::GetUserFontsLog()
{
static LazyLogModule sLog("userfonts");
return sLog;
}
#define LOG(args) MOZ_LOG(gfxUserFontSet::GetUserFontsLog(), mozilla::LogLevel::Debug, args)
#define LOG_ENABLED() MOZ_LOG_TEST(gfxUserFontSet::GetUserFontsLog(), mozilla::LogLevel::Debug)
static uint64_t sFontSetGeneration = 0;
// Based on ots::ExpandingMemoryStream from ots-memory-stream.h,
// adapted to use Mozilla allocators and to allow the final
// memory buffer to be adopted by the client.
class ExpandingMemoryStream : public ots::OTSStream {
public:
ExpandingMemoryStream(size_t initial, size_t limit)
: mLength(initial), mLimit(limit), mOff(0) {
mPtr = moz_xmalloc(mLength);
}
~ExpandingMemoryStream() {
free(mPtr);
}
// Return the buffer, resized to fit its contents (as it may have been
// over-allocated during growth), and give up ownership of it so the
// caller becomes responsible to call free() when finished with it.
void* forget() {
void* p = moz_xrealloc(mPtr, mOff);
mPtr = nullptr;
return p;
}
bool WriteRaw(const void* data, size_t length) {
if ((mOff + length > mLength) ||
(mLength > std::numeric_limits<size_t>::max() - mOff)) {
if (mLength == mLimit) {
return false;
}
size_t newLength = (mLength + 1) * 2;
if (newLength < mLength) {
return false;
}
if (newLength > mLimit) {
newLength = mLimit;
}
mPtr = moz_xrealloc(mPtr, newLength);
mLength = newLength;
return WriteRaw(data, length);
}
std::memcpy(static_cast<char*>(mPtr) + mOff, data, length);
mOff += length;
return true;
}
bool Seek(off_t position) {
if (position < 0) {
return false;
}
if (static_cast<size_t>(position) > mLength) {
return false;
}
mOff = position;
return true;
}
off_t Tell() const {
return mOff;
}
private:
void* mPtr;
size_t mLength;
const size_t mLimit;
off_t mOff;
};
gfxUserFontEntry::gfxUserFontEntry(gfxUserFontSet* aFontSet,
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint8_t aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges,
uint8_t aFontDisplay)
: gfxFontEntry(NS_LITERAL_STRING("userfont")),
mUserFontLoadState(STATUS_NOT_LOADED),
mFontDataLoadingState(NOT_LOADING),
mUnsupportedFormat(false),
mFontDisplay(aFontDisplay),
mLoader(nullptr),
mFontSet(aFontSet)
{
MOZ_ASSERT(aWeight != 0,
"aWeight must not be 0; use NS_FONT_WEIGHT_NORMAL instead");
mIsUserFontContainer = true;
mSrcList = aFontFaceSrcList;
mSrcIndex = 0;
mWeight = aWeight;
mStretch = aStretch;
mStyle = aStyle;
mFeatureSettings.AppendElements(aFeatureSettings);
mLanguageOverride = aLanguageOverride;
if (aUnicodeRanges) {
mCharacterMap = new gfxCharacterMap(*aUnicodeRanges);
}
}
gfxUserFontEntry::~gfxUserFontEntry()
{
}
bool
gfxUserFontEntry::Matches(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint8_t aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges,
uint8_t aFontDisplay)
{
return mWeight == aWeight &&
mStretch == aStretch &&
mStyle == aStyle &&
mFeatureSettings == aFeatureSettings &&
mLanguageOverride == aLanguageOverride &&
mSrcList == aFontFaceSrcList &&
mFontDisplay == aFontDisplay &&
((!aUnicodeRanges && !mCharacterMap) ||
(aUnicodeRanges && mCharacterMap && mCharacterMap->Equals(aUnicodeRanges)));
}
gfxFont*
gfxUserFontEntry::CreateFontInstance(const gfxFontStyle* aFontStyle, bool aNeedsBold)
{
NS_NOTREACHED("should only be creating a gfxFont"
" with an actual platform font entry");
// userfont entry is a container, can't create font from the container
return nullptr;
}
class gfxOTSContext : public ots::OTSContext {
public:
explicit gfxOTSContext(gfxUserFontEntry* aUserFontEntry)
: mUserFontEntry(aUserFontEntry)
{
// Whether to apply OTS validation to OpenType Layout tables
mCheckOTLTables = gfxPrefs::ValidateOTLTables();
// Whether to preserve Variation tables in downloaded fonts
mKeepVariationTables = gfxPrefs::KeepVariationTables();
}
virtual ots::TableAction GetTableAction(uint32_t aTag) override {
// Preserve Graphite, color glyph and SVG tables,
// and possibly OTL and Variation tables (depending on prefs)
if ((!mCheckOTLTables &&
(aTag == TRUETYPE_TAG('G', 'D', 'E', 'F') ||
aTag == TRUETYPE_TAG('G', 'P', 'O', 'S') ||
aTag == TRUETYPE_TAG('G', 'S', 'U', 'B'))) ||
(mKeepVariationTables &&
(aTag == TRUETYPE_TAG('a', 'v', 'a', 'r') ||
aTag == TRUETYPE_TAG('c', 'v', 'a', 'r') ||
aTag == TRUETYPE_TAG('f', 'v', 'a', 'r') ||
aTag == TRUETYPE_TAG('g', 'v', 'a', 'r') ||
aTag == TRUETYPE_TAG('H', 'V', 'A', 'R') ||
aTag == TRUETYPE_TAG('M', 'V', 'A', 'R') ||
aTag == TRUETYPE_TAG('V', 'V', 'A', 'R'))) ||
aTag == TRUETYPE_TAG('S', 'i', 'l', 'f') ||
aTag == TRUETYPE_TAG('S', 'i', 'l', 'l') ||
aTag == TRUETYPE_TAG('G', 'l', 'o', 'c') ||
aTag == TRUETYPE_TAG('G', 'l', 'a', 't') ||
aTag == TRUETYPE_TAG('F', 'e', 'a', 't') ||
aTag == TRUETYPE_TAG('S', 'V', 'G', ' ') ||
aTag == TRUETYPE_TAG('C', 'O', 'L', 'R') ||
aTag == TRUETYPE_TAG('C', 'P', 'A', 'L')) {
return ots::TABLE_ACTION_PASSTHRU;
}
return ots::TABLE_ACTION_DEFAULT;
}
virtual void Message(int level, const char* format,
...) MSGFUNC_FMT_ATTR override {
va_list va;
va_start(va, format);
nsCString msg;
msg.AppendPrintf(format, va);
va_end(va);
if (level > 0) {
// For warnings (rather than errors that cause the font to fail),
// we only report the first instance of any given message.
if (mWarningsIssued.Contains(msg)) {
return;
}
mWarningsIssued.PutEntry(msg);
}
mUserFontEntry->mFontSet->LogMessage(mUserFontEntry, msg.get());
}
private:
gfxUserFontEntry* mUserFontEntry;
nsTHashtable<nsCStringHashKey> mWarningsIssued;
bool mCheckOTLTables;
bool mKeepVariationTables;
};
// Call the OTS library to sanitize an sfnt before attempting to use it.
// Returns a newly-allocated block, or nullptr in case of fatal errors.
const uint8_t*
gfxUserFontEntry::SanitizeOpenTypeData(const uint8_t* aData,
uint32_t aLength,
uint32_t& aSaneLength,
gfxUserFontType aFontType)
{
if (aFontType == GFX_USERFONT_UNKNOWN) {
aSaneLength = 0;
return nullptr;
}
uint32_t lengthHint = aLength;
if (aFontType == GFX_USERFONT_WOFF) {
lengthHint *= 2;
} else if (aFontType == GFX_USERFONT_WOFF2) {
lengthHint *= 3;
}
// limit output/expansion to 256MB
ExpandingMemoryStream output(lengthHint, 1024 * 1024 * 256);
gfxOTSContext otsContext(this);
if (!otsContext.Process(&output, aData, aLength)) {
// Failed to decode/sanitize the font, so discard it.
aSaneLength = 0;
return nullptr;
}
aSaneLength = output.Tell();
return static_cast<const uint8_t*>(output.forget());
}
void
gfxUserFontEntry::StoreUserFontData(gfxFontEntry* aFontEntry,
bool aPrivate,
const nsAString& aOriginalName,
FallibleTArray<uint8_t>* aMetadata,
uint32_t aMetaOrigLen,
uint8_t aCompression)
{
if (!aFontEntry->mUserFontData) {
aFontEntry->mUserFontData = MakeUnique<gfxUserFontData>();
}
gfxUserFontData* userFontData = aFontEntry->mUserFontData.get();
userFontData->mSrcIndex = mSrcIndex;
const gfxFontFaceSrc& src = mSrcList[mSrcIndex];
switch (src.mSourceType) {
case gfxFontFaceSrc::eSourceType_Local:
userFontData->mLocalName = src.mLocalName;
break;
case gfxFontFaceSrc::eSourceType_URL:
userFontData->mURI = src.mURI;
userFontData->mPrincipal = mPrincipal;
break;
case gfxFontFaceSrc::eSourceType_Buffer:
userFontData->mIsBuffer = true;
break;
}
userFontData->mPrivate = aPrivate;
userFontData->mFormat = src.mFormatFlags;
userFontData->mRealName = aOriginalName;
if (aMetadata) {
userFontData->mMetadata.SwapElements(*aMetadata);
userFontData->mMetaOrigLen = aMetaOrigLen;
userFontData->mCompression = aCompression;
}
}
size_t
gfxUserFontData::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this)
+ mMetadata.ShallowSizeOfExcludingThis(aMallocSizeOf)
+ mLocalName.SizeOfExcludingThisIfUnshared(aMallocSizeOf)
+ mRealName.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
// Not counting mURI and mPrincipal, as those will be shared.
}
/*virtual*/
gfxUserFontFamily::~gfxUserFontFamily()
{
// Should not be dropped by stylo
MOZ_ASSERT(NS_IsMainThread());
}
void
gfxUserFontEntry::GetFamilyNameAndURIForLogging(nsACString& aFamilyName,
nsACString& aURI)
{
aFamilyName.Assign(NS_ConvertUTF16toUTF8(mFamilyName));
aURI.Truncate();
if (mSrcIndex == mSrcList.Length()) {
aURI.AppendLiteral("(end of source list)");
} else {
if (mSrcList[mSrcIndex].mURI) {
mSrcList[mSrcIndex].mURI->GetSpec(aURI);
// If the source URI was very long, elide the middle of it.
// In principle, the byte-oriented chopping here could leave us
// with partial UTF-8 characters at the point where we cut it,
// but it really doesn't matter as this is just for logging.
const uint32_t kMaxURILengthForLogging = 256;
// UTF-8 ellipsis, with spaces to allow additional wrap opportunities
// in the resulting log message
const char kEllipsis[] = { ' ', '\xE2', '\x80', '\xA6', ' ' };
if (aURI.Length() > kMaxURILengthForLogging) {
aURI.Replace(kMaxURILengthForLogging / 2,
aURI.Length() - kMaxURILengthForLogging,
kEllipsis, ArrayLength(kEllipsis));
}
} else {
aURI.AppendLiteral("(invalid URI)");
}
}
}
struct WOFFHeader {
AutoSwap_PRUint32 signature;
AutoSwap_PRUint32 flavor;
AutoSwap_PRUint32 length;
AutoSwap_PRUint16 numTables;
AutoSwap_PRUint16 reserved;
AutoSwap_PRUint32 totalSfntSize;
AutoSwap_PRUint16 majorVersion;
AutoSwap_PRUint16 minorVersion;
AutoSwap_PRUint32 metaOffset;
AutoSwap_PRUint32 metaCompLen;
AutoSwap_PRUint32 metaOrigLen;
AutoSwap_PRUint32 privOffset;
AutoSwap_PRUint32 privLen;
};
struct WOFF2Header {
AutoSwap_PRUint32 signature;
AutoSwap_PRUint32 flavor;
AutoSwap_PRUint32 length;
AutoSwap_PRUint16 numTables;
AutoSwap_PRUint16 reserved;
AutoSwap_PRUint32 totalSfntSize;
AutoSwap_PRUint32 totalCompressedSize;
AutoSwap_PRUint16 majorVersion;
AutoSwap_PRUint16 minorVersion;
AutoSwap_PRUint32 metaOffset;
AutoSwap_PRUint32 metaCompLen;
AutoSwap_PRUint32 metaOrigLen;
AutoSwap_PRUint32 privOffset;
AutoSwap_PRUint32 privLen;
};
template<typename HeaderT>
void
CopyWOFFMetadata(const uint8_t* aFontData,
uint32_t aLength,
FallibleTArray<uint8_t>* aMetadata,
uint32_t* aMetaOrigLen)
{
// This function may be called with arbitrary, unvalidated "font" data
// from @font-face, so it needs to be careful to bounds-check, etc.,
// before trying to read anything.
// This just saves a copy of the compressed data block; it does NOT check
// that the block can be successfully decompressed, or that it contains
// well-formed/valid XML metadata.
if (aLength < sizeof(HeaderT)) {
return;
}
const HeaderT* woff =
reinterpret_cast<const HeaderT*>(aFontData);
uint32_t metaOffset = woff->metaOffset;
uint32_t metaCompLen = woff->metaCompLen;
if (!metaOffset || !metaCompLen || !woff->metaOrigLen) {
return;
}
if (metaOffset >= aLength || metaCompLen > aLength - metaOffset) {
return;
}
if (!aMetadata->SetLength(woff->metaCompLen, fallible)) {
return;
}
memcpy(aMetadata->Elements(), aFontData + metaOffset, metaCompLen);
*aMetaOrigLen = woff->metaOrigLen;
}
void
gfxUserFontEntry::LoadNextSrc()
{
uint32_t numSrc = mSrcList.Length();
NS_ASSERTION(mSrcIndex < numSrc,
"already at the end of the src list for user font");
NS_ASSERTION((mUserFontLoadState == STATUS_NOT_LOADED ||
mUserFontLoadState == STATUS_LOADING) &&
mFontDataLoadingState < LOADING_FAILED,
"attempting to load a font that has either completed or failed");
if (mUserFontLoadState == STATUS_NOT_LOADED) {
SetLoadState(STATUS_LOADING);
mFontDataLoadingState = LOADING_STARTED;
mUnsupportedFormat = false;
} else {
// we were already loading; move to the next source,
// but don't reset state - if we've already timed out,
// that counts against the new download
mSrcIndex++;
}
// load each src entry in turn, until a local face is found
// or a download begins successfully
while (mSrcIndex < numSrc) {
gfxFontFaceSrc& currSrc = mSrcList[mSrcIndex];
// src local ==> lookup and load immediately
if (currSrc.mSourceType == gfxFontFaceSrc::eSourceType_Local) {
// Don't look up local fonts if the font whitelist is being used.
gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
gfxFontEntry* fe = pfl && pfl->IsFontFamilyWhitelistActive() ?
nullptr :
gfxPlatform::GetPlatform()->LookupLocalFont(currSrc.mLocalName,
mWeight,
mStretch,
mStyle);
nsTArray<gfxUserFontSet*> fontSets;
GetUserFontSets(fontSets);
for (gfxUserFontSet* fontSet : fontSets) {
// We need to note on each gfxUserFontSet that contains the user
// font entry that we used a local() rule.
fontSet->SetLocalRulesUsed();
}
if (fe) {
LOG(("userfonts (%p) [src %d] loaded local: (%s) for (%s) gen: %8.8x\n",
mFontSet, mSrcIndex,
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
NS_ConvertUTF16toUTF8(mFamilyName).get(),
uint32_t(mFontSet->mGeneration)));
fe->mFeatureSettings.AppendElements(mFeatureSettings);
fe->mLanguageOverride = mLanguageOverride;
fe->mFamilyName = mFamilyName;
// For src:local(), we don't care whether the request is from
// a private window as there's no issue of caching resources;
// local fonts are just available all the time.
StoreUserFontData(fe, false, nsString(), nullptr, 0,
gfxUserFontData::kUnknownCompression);
mPlatformFontEntry = fe;
SetLoadState(STATUS_LOADED);
Telemetry::Accumulate(Telemetry::WEBFONT_SRCTYPE,
currSrc.mSourceType + 1);
return;
} else {
LOG(("userfonts (%p) [src %d] failed local: (%s) for (%s)\n",
mFontSet, mSrcIndex,
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
}
// src url ==> start the load process
else if (currSrc.mSourceType == gfxFontFaceSrc::eSourceType_URL) {
if (gfxPlatform::GetPlatform()->IsFontFormatSupported(currSrc.mURI,
currSrc.mFormatFlags)) {
nsIPrincipal* principal = nullptr;
bool bypassCache;
nsresult rv = mFontSet->CheckFontLoad(&currSrc, &principal,
&bypassCache);
if (NS_SUCCEEDED(rv) && principal != nullptr) {
if (!bypassCache) {
// see if we have an existing entry for this source
gfxFontEntry* fe = gfxUserFontSet::
UserFontCache::GetFont(currSrc.mURI,
principal,
this,
mFontSet->GetPrivateBrowsing());
if (fe) {
mPlatformFontEntry = fe;
SetLoadState(STATUS_LOADED);
if (LOG_ENABLED()) {
LOG(("userfonts (%p) [src %d] "
"loaded uri from cache: (%s) for (%s)\n",
mFontSet, mSrcIndex,
currSrc.mURI->GetSpecOrDefault().get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
return;
}
}
// record the principal returned by CheckFontLoad,
// for use when creating a channel
// and when caching the loaded entry
mPrincipal = principal;
bool loadDoesntSpin = false;
rv = NS_URIChainHasFlags(currSrc.mURI,
nsIProtocolHandler::URI_SYNC_LOAD_IS_OK,
&loadDoesntSpin);
if (NS_SUCCEEDED(rv) && loadDoesntSpin) {
uint8_t* buffer = nullptr;
uint32_t bufferLength = 0;
// sync load font immediately
rv = mFontSet->SyncLoadFontData(this, &currSrc, buffer,
bufferLength);
if (NS_SUCCEEDED(rv) &&
LoadPlatformFont(buffer, bufferLength)) {
SetLoadState(STATUS_LOADED);
Telemetry::Accumulate(Telemetry::WEBFONT_SRCTYPE,
currSrc.mSourceType + 1);
return;
} else {
mFontSet->LogMessage(this,
"font load failed",
nsIScriptError::errorFlag,
rv);
}
} else {
// otherwise load font async
rv = mFontSet->StartLoad(this, &currSrc);
bool loadOK = NS_SUCCEEDED(rv);
if (loadOK) {
if (LOG_ENABLED()) {
LOG(("userfonts (%p) [src %d] loading uri: (%s) for (%s)\n",
mFontSet, mSrcIndex,
currSrc.mURI->GetSpecOrDefault().get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
return;
} else {
mFontSet->LogMessage(this,
"download failed",
nsIScriptError::errorFlag,
rv);
}
}
} else {
mFontSet->LogMessage(this, "download not allowed",
nsIScriptError::errorFlag, rv);
}
} else {
// We don't log a warning to the web console yet,
// as another source may load successfully
mUnsupportedFormat = true;
}
}
// FontFace buffer ==> load immediately
else {
MOZ_ASSERT(currSrc.mSourceType == gfxFontFaceSrc::eSourceType_Buffer);
uint8_t* buffer = nullptr;
uint32_t bufferLength = 0;
// sync load font immediately
currSrc.mBuffer->TakeBuffer(buffer, bufferLength);
if (buffer && LoadPlatformFont(buffer, bufferLength)) {
// LoadPlatformFont takes ownership of the buffer, so no need
// to free it here.
SetLoadState(STATUS_LOADED);
Telemetry::Accumulate(Telemetry::WEBFONT_SRCTYPE,
currSrc.mSourceType + 1);
return;
} else {
mFontSet->LogMessage(this,
"font load failed",
nsIScriptError::errorFlag);
}
}
mSrcIndex++;
}
if (mUnsupportedFormat) {
mFontSet->LogMessage(this, "no supported format found",
nsIScriptError::warningFlag);
}
// all src's failed; mark this entry as unusable (so fallback will occur)
LOG(("userfonts (%p) failed all src for (%s)\n",
mFontSet, NS_ConvertUTF16toUTF8(mFamilyName).get()));
mFontDataLoadingState = LOADING_FAILED;
SetLoadState(STATUS_FAILED);
}
void
gfxUserFontEntry::SetLoadState(UserFontLoadState aLoadState)
{
mUserFontLoadState = aLoadState;
}
MOZ_DEFINE_MALLOC_SIZE_OF_ON_ALLOC(UserFontMallocSizeOfOnAlloc)
bool
gfxUserFontEntry::LoadPlatformFont(const uint8_t* aFontData, uint32_t& aLength)
{
NS_ASSERTION((mUserFontLoadState == STATUS_NOT_LOADED ||
mUserFontLoadState == STATUS_LOADING) &&
mFontDataLoadingState < LOADING_FAILED,
"attempting to load a font that has either completed or failed");
gfxFontEntry* fe = nullptr;
gfxUserFontType fontType =
gfxFontUtils::DetermineFontDataType(aFontData, aLength);
Telemetry::Accumulate(Telemetry::WEBFONT_FONTTYPE, uint32_t(fontType));
// Unwrap/decompress/sanitize or otherwise munge the downloaded data
// to make a usable sfnt structure.
// Because platform font activation code may replace the name table
// in the font with a synthetic one, we save the original name so that
// it can be reported via the nsIDOMFontFace API.
nsAutoString originalFullName;
// Call the OTS sanitizer; this will also decode WOFF to sfnt
// if necessary. The original data in aFontData is left unchanged.
uint32_t saneLen;
uint32_t fontCompressionRatio = 0;
size_t computedSize = 0;
const uint8_t* saneData =
SanitizeOpenTypeData(aFontData, aLength, saneLen, fontType);
if (!saneData) {
mFontSet->LogMessage(this, "rejected by sanitizer");
} else {
// Check whether saneData is a known OpenType format; it might be
// a TrueType Collection, which OTS would accept but we don't yet
// know how to handle. If so, discard.
if (gfxFontUtils::DetermineFontDataType(saneData, saneLen) !=
GFX_USERFONT_OPENTYPE) {
mFontSet->LogMessage(this, "not a supported OpenType format");
free((void*)saneData);
saneData = nullptr;
}
}
if (saneData) {
if (saneLen) {
fontCompressionRatio = uint32_t(100.0 * aLength / saneLen + 0.5);
if (fontType == GFX_USERFONT_WOFF ||
fontType == GFX_USERFONT_WOFF2) {
Telemetry::Accumulate(fontType == GFX_USERFONT_WOFF ?
Telemetry::WEBFONT_COMPRESSION_WOFF :
Telemetry::WEBFONT_COMPRESSION_WOFF2,
fontCompressionRatio);
}
}
// The sanitizer ensures that we have a valid sfnt and a usable
// name table, so this should never fail unless we're out of
// memory, and GetFullNameFromSFNT is not directly exposed to
// arbitrary/malicious data from the web.
gfxFontUtils::GetFullNameFromSFNT(saneData, saneLen,
originalFullName);
// Record size for memory reporting purposes. We measure this now
// because by the time we potentially want to collect reports, this
// data block may have been handed off to opaque OS font APIs that
// don't allow us to retrieve or measure it directly.
// The *OnAlloc function will also tell DMD about this block, as the
// OS font code may hold on to it for an extended period.
computedSize = UserFontMallocSizeOfOnAlloc(saneData);
// Here ownership of saneData is passed to the platform,
// which will delete it when no longer required
fe = gfxPlatform::GetPlatform()->MakePlatformFont(mName,
mWeight,
mStretch,
mStyle,
saneData,
saneLen);
if (!fe) {
mFontSet->LogMessage(this, "not usable by platform");
}
}
if (fe) {
fe->mComputedSizeOfUserFont = computedSize;
// Save a copy of the metadata block (if present) for nsIDOMFontFace
// to use if required. Ownership of the metadata block will be passed
// to the gfxUserFontData record below.
FallibleTArray<uint8_t> metadata;
uint32_t metaOrigLen = 0;
uint8_t compression = gfxUserFontData::kUnknownCompression;
if (fontType == GFX_USERFONT_WOFF) {
CopyWOFFMetadata<WOFFHeader>(aFontData, aLength,
&metadata, &metaOrigLen);
compression = gfxUserFontData::kZlibCompression;
} else if (fontType == GFX_USERFONT_WOFF2) {
CopyWOFFMetadata<WOFF2Header>(aFontData, aLength,
&metadata, &metaOrigLen);
compression = gfxUserFontData::kBrotliCompression;
}
// copy OpenType feature/language settings from the userfont entry to the
// newly-created font entry
fe->mFeatureSettings.AppendElements(mFeatureSettings);
fe->mLanguageOverride = mLanguageOverride;
fe->mFamilyName = mFamilyName;
StoreUserFontData(fe, mFontSet->GetPrivateBrowsing(), originalFullName,
&metadata, metaOrigLen, compression);
if (LOG_ENABLED()) {
LOG(("userfonts (%p) [src %d] loaded uri: (%s) for (%s) "
"(%p) gen: %8.8x compress: %d%%\n",
mFontSet, mSrcIndex,
mSrcList[mSrcIndex].mURI->GetSpecOrDefault().get(),
NS_ConvertUTF16toUTF8(mFamilyName).get(),
this, uint32_t(mFontSet->mGeneration), fontCompressionRatio));
}
mPlatformFontEntry = fe;
SetLoadState(STATUS_LOADED);
gfxUserFontSet::UserFontCache::CacheFont(fe);
} else {
if (LOG_ENABLED()) {
LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s)"
" error making platform font\n",
mFontSet, mSrcIndex,
mSrcList[mSrcIndex].mURI->GetSpecOrDefault().get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
}
// The downloaded data can now be discarded; the font entry is using the
// sanitized copy
free((void*)aFontData);
return fe != nullptr;
}
void
gfxUserFontEntry::Load()
{
if (mUserFontLoadState == STATUS_NOT_LOADED) {
LoadNextSrc();
}
}
void
gfxUserFontEntry::IncrementGeneration()
{
nsTArray<gfxUserFontSet*> fontSets;
GetUserFontSets(fontSets);
for (gfxUserFontSet* fontSet : fontSets) {
fontSet->IncrementGeneration();
}
}
// This is called when a font download finishes.
// Ownership of aFontData passes in here, and the font set must
// ensure that it is eventually deleted via free().
bool
gfxUserFontEntry::FontDataDownloadComplete(const uint8_t* aFontData,
uint32_t aLength,
nsresult aDownloadStatus)
{
// forget about the loader, as we no longer potentially need to cancel it
// if the entry is obsoleted
mLoader = nullptr;
// download successful, make platform font using font data
if (NS_SUCCEEDED(aDownloadStatus) &&
mFontDataLoadingState != LOADING_TIMED_OUT) {
bool loaded = LoadPlatformFont(aFontData, aLength);
aFontData = nullptr;
if (loaded) {
IncrementGeneration();
return true;
}
} else {
// download failed
mFontSet->LogMessage(this,
(mFontDataLoadingState != LOADING_TIMED_OUT ?
"download failed" : "download timed out"),
nsIScriptError::errorFlag,
aDownloadStatus);
}
if (aFontData) {
free((void*)aFontData);
}
// error occurred, load next src if load not yet timed out
if (mFontDataLoadingState != LOADING_TIMED_OUT) {
LoadNextSrc();
}
// We ignore the status returned by LoadNext();
// even if loading failed, we need to bump the font-set generation
// and return true in order to trigger reflow, so that fallback
// will be used where the text was "masked" by the pending download
IncrementGeneration();
return true;
}
void
gfxUserFontEntry::GetUserFontSets(nsTArray<gfxUserFontSet*>& aResult)
{
aResult.Clear();
aResult.AppendElement(mFontSet);
}
gfxUserFontSet::gfxUserFontSet()
: mFontFamilies(4),
mLocalRulesUsed(false),
mRebuildLocalRules(false),
mDownloadCount(0),
mDownloadSize(0)
{
IncrementGeneration(true);
gfxPlatformFontList* fp = gfxPlatformFontList::PlatformFontList();
if (fp) {
fp->AddUserFontSet(this);
}
}
gfxUserFontSet::~gfxUserFontSet()
{
gfxPlatformFontList* fp = gfxPlatformFontList::PlatformFontList();
if (fp) {
fp->RemoveUserFontSet(this);
}
}
already_AddRefed<gfxUserFontEntry>
gfxUserFontSet::FindOrCreateUserFontEntry(
const nsAString& aFamilyName,
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint8_t aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges,
uint8_t aFontDisplay)
{
RefPtr<gfxUserFontEntry> entry;
// If there's already a userfont entry in the family whose descriptors all match,
// we can just move it to the end of the list instead of adding a new
// face that will always "shadow" the old one.
// Note that we can't do this for platform font entries, even if the
// style descriptors match, as they might have had a different source list,
// but we no longer have the old source list available to check.
gfxUserFontFamily* family = LookupFamily(aFamilyName);
if (family) {
entry = FindExistingUserFontEntry(family, aFontFaceSrcList, aWeight,
aStretch, aStyle,
aFeatureSettings, aLanguageOverride,
aUnicodeRanges, aFontDisplay);
}
if (!entry) {
entry = CreateUserFontEntry(aFontFaceSrcList, aWeight, aStretch,
aStyle, aFeatureSettings,
aLanguageOverride, aUnicodeRanges,
aFontDisplay);
entry->mFamilyName = aFamilyName;
}
return entry.forget();
}
already_AddRefed<gfxUserFontEntry>
gfxUserFontSet::CreateUserFontEntry(
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint8_t aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges,
uint8_t aFontDisplay)
{
RefPtr<gfxUserFontEntry> userFontEntry =
new gfxUserFontEntry(this, aFontFaceSrcList, aWeight,
aStretch, aStyle, aFeatureSettings,
aLanguageOverride, aUnicodeRanges, aFontDisplay);
return userFontEntry.forget();
}
gfxUserFontEntry*
gfxUserFontSet::FindExistingUserFontEntry(
gfxUserFontFamily* aFamily,
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint8_t aStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges,
uint8_t aFontDisplay)
{
MOZ_ASSERT(aWeight != 0,
"aWeight must not be 0; use NS_FONT_WEIGHT_NORMAL instead");
nsTArray<RefPtr<gfxFontEntry>>& fontList = aFamily->GetFontList();
for (size_t i = 0, count = fontList.Length(); i < count; i++) {
if (!fontList[i]->mIsUserFontContainer) {
continue;
}
gfxUserFontEntry* existingUserFontEntry =
static_cast<gfxUserFontEntry*>(fontList[i].get());
if (!existingUserFontEntry->Matches(aFontFaceSrcList,
aWeight, aStretch, aStyle,
aFeatureSettings, aLanguageOverride,
aUnicodeRanges, aFontDisplay)) {
continue;
}
return existingUserFontEntry;
}
return nullptr;
}
void
gfxUserFontSet::AddUserFontEntry(const nsAString& aFamilyName,
gfxUserFontEntry* aUserFontEntry)
{
gfxUserFontFamily* family = GetFamily(aFamilyName);
family->AddFontEntry(aUserFontEntry);
if (LOG_ENABLED()) {
LOG(("userfonts (%p) added to \"%s\" (%p) style: %s weight: %d "
"stretch: %d display: %d",
this, NS_ConvertUTF16toUTF8(aFamilyName).get(), aUserFontEntry,
(aUserFontEntry->IsItalic() ? "italic" :
(aUserFontEntry->IsOblique() ? "oblique" : "normal")),
aUserFontEntry->Weight(), aUserFontEntry->Stretch(),
aUserFontEntry->GetFontDisplay()));
}
}
void
gfxUserFontSet::IncrementGeneration(bool aIsRebuild)
{
// add one, increment again if zero
++sFontSetGeneration;
if (sFontSetGeneration == 0)
++sFontSetGeneration;
mGeneration = sFontSetGeneration;
if (aIsRebuild) {
mRebuildGeneration = mGeneration;
}
}
void
gfxUserFontSet::RebuildLocalRules()
{
if (mLocalRulesUsed) {
mRebuildLocalRules = true;
DoRebuildUserFontSet();
}
}
gfxUserFontFamily*
gfxUserFontSet::LookupFamily(const nsAString& aFamilyName) const
{
nsAutoString key(aFamilyName);
ToLowerCase(key);
return mFontFamilies.GetWeak(key);
}
bool
gfxUserFontSet::ContainsUserFontSetFonts(const FontFamilyList& aFontList) const
{
for (const FontFamilyName& name : aFontList.GetFontlist()) {
if (name.mType != eFamily_named &&
name.mType != eFamily_named_quoted) {
continue;
}
if (LookupFamily(name.mName)) {
return true;
}
}
return false;
}
gfxUserFontFamily*
gfxUserFontSet::GetFamily(const nsAString& aFamilyName)
{
nsAutoString key(aFamilyName);
ToLowerCase(key);
gfxUserFontFamily* family = mFontFamilies.GetWeak(key);
if (!family) {
family = new gfxUserFontFamily(aFamilyName);
mFontFamilies.Put(key, family);
}
return family;
}
///////////////////////////////////////////////////////////////////////////////
// gfxUserFontSet::UserFontCache - re-use platform font entries for user fonts
// across pages/fontsets rather than instantiating new platform fonts.
//
// Entries are added to this cache when a platform font is instantiated from
// downloaded data, and removed when the platform font entry is destroyed.
// We don't need to use a timed expiration scheme here because the gfxFontEntry
// for a downloaded font will be kept alive by its corresponding gfxFont
// instance(s) until they are deleted, and *that* happens using an expiration
// tracker (gfxFontCache). The result is that the downloaded font instances
// recorded here will persist between pages and can get reused (provided the
// source URI and principal match, of course).
///////////////////////////////////////////////////////////////////////////////
nsTHashtable<gfxUserFontSet::UserFontCache::Entry>*
gfxUserFontSet::UserFontCache::sUserFonts = nullptr;
NS_IMPL_ISUPPORTS(gfxUserFontSet::UserFontCache::Flusher, nsIObserver)
NS_IMETHODIMP
gfxUserFontSet::UserFontCache::Flusher::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (!sUserFonts) {
return NS_OK;
}
if (!strcmp(aTopic, "cacheservice:empty-cache")) {
for (auto i = sUserFonts->Iter(); !i.Done(); i.Next()) {
if (!i.Get()->IsPersistent()) {
i.Remove();
}
}
} else if (!strcmp(aTopic, "last-pb-context-exited")) {
for (auto i = sUserFonts->Iter(); !i.Done(); i.Next()) {
if (i.Get()->IsPrivate()) {
i.Remove();
}
}
} else if (!strcmp(aTopic, "xpcom-shutdown")) {
for (auto i = sUserFonts->Iter(); !i.Done(); i.Next()) {
i.Get()->GetFontEntry()->DisconnectSVG();
}
} else {
NS_NOTREACHED("unexpected topic");
}
return NS_OK;
}
static bool
IgnorePrincipal(nsIURI* aURI)
{
nsresult rv;
bool inherits = false;
rv = NS_URIChainHasFlags(aURI,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
&inherits);
return NS_SUCCEEDED(rv) && inherits;
}
bool
gfxUserFontSet::UserFontCache::Entry::KeyEquals(const KeyTypePointer aKey) const
{
const gfxFontEntry* fe = aKey->mFontEntry;
// CRC32 checking mode
if (mLength || aKey->mLength) {
if (aKey->mLength != mLength ||
aKey->mCRC32 != mCRC32) {
return false;
}
} else {
bool result;
if (NS_FAILED(mURI->Equals(aKey->mURI, &result)) || !result) {
return false;
}
// For data: URIs, we don't care about the principal; otherwise, check it.
if (!IgnorePrincipal(mURI)) {
NS_ASSERTION(mPrincipal && aKey->mPrincipal,
"only data: URIs are allowed to omit the principal");
if (NS_FAILED(mPrincipal->Equals(aKey->mPrincipal, &result)) ||
!result) {
return false;
}
}
if (mPrivate != aKey->mPrivate) {
return false;
}
}
if (mFontEntry->mStyle != fe->mStyle ||
mFontEntry->mWeight != fe->mWeight ||
mFontEntry->mStretch != fe->mStretch ||
mFontEntry->mFeatureSettings != fe->mFeatureSettings ||
mFontEntry->mLanguageOverride != fe->mLanguageOverride ||
mFontEntry->mFamilyName != fe->mFamilyName) {
return false;
}
return true;
}
void
gfxUserFontSet::UserFontCache::CacheFont(gfxFontEntry* aFontEntry,
EntryPersistence aPersistence)
{
NS_ASSERTION(aFontEntry->mFamilyName.Length() != 0,
"caching a font associated with no family yet");
// if caching is disabled, simply return
if (Preferences::GetBool("gfx.downloadable_fonts.disable_cache")) {
return;
}
gfxUserFontData* data = aFontEntry->mUserFontData.get();
if (data->mIsBuffer) {
#ifdef DEBUG_USERFONT_CACHE
printf("userfontcache skipped fontentry with buffer source: %p\n",
aFontEntry);
#endif
return;
}
if (!sUserFonts) {
sUserFonts = new nsTHashtable<Entry>;
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
Flusher* flusher = new Flusher;
obs->AddObserver(flusher, "cacheservice:empty-cache",
false);
obs->AddObserver(flusher, "last-pb-context-exited", false);
obs->AddObserver(flusher, "xpcom-shutdown", false);
}
// Create and register a memory reporter for sUserFonts.
// This reporter is never unregistered, but that's OK because
// the reporter checks whether sUserFonts is null, so it would
// be safe to call even after UserFontCache::Shutdown has deleted
// the cache.
RegisterStrongMemoryReporter(new MemoryReporter());
}
if (data->mLength) {
MOZ_ASSERT(aPersistence == kPersistent);
MOZ_ASSERT(!data->mPrivate);
sUserFonts->PutEntry(Key(data->mCRC32, data->mLength, aFontEntry,
data->mPrivate, aPersistence));
} else {
MOZ_ASSERT(aPersistence == kDiscardable);
// For data: URIs, the principal is ignored; anyone who has the same
// data: URI is able to load it and get an equivalent font.
// Otherwise, the principal is used as part of the cache key.
nsIPrincipal* principal;
if (IgnorePrincipal(data->mURI)) {
principal = nullptr;
} else {
principal = data->mPrincipal;
}
sUserFonts->PutEntry(Key(data->mURI, principal, aFontEntry,
data->mPrivate, aPersistence));
}
#ifdef DEBUG_USERFONT_CACHE
printf("userfontcache added fontentry: %p\n", aFontEntry);
Dump();
#endif
}
void
gfxUserFontSet::UserFontCache::ForgetFont(gfxFontEntry* aFontEntry)
{
if (!sUserFonts) {
// if we've already deleted the cache (i.e. during shutdown),
// just ignore this
return;
}
// We can't simply use RemoveEntry here because it's possible the principal
// may have changed since the font was cached, in which case the lookup
// would no longer find the entry (bug 838105).
for (auto i = sUserFonts->Iter(); !i.Done(); i.Next()) {
if (i.Get()->GetFontEntry() == aFontEntry) {
i.Remove();
}
}
#ifdef DEBUG_USERFONT_CACHE
printf("userfontcache removed fontentry: %p\n", aFontEntry);
Dump();
#endif
}
gfxFontEntry*
gfxUserFontSet::UserFontCache::GetFont(nsIURI* aSrcURI,
nsIPrincipal* aPrincipal,
gfxUserFontEntry* aUserFontEntry,
bool aPrivate)
{
if (!sUserFonts ||
Preferences::GetBool("gfx.downloadable_fonts.disable_cache")) {
return nullptr;
}
// We have to perform another content policy check here to prevent
// cache poisoning. E.g. a.com loads a font into the cache but
// b.com has a CSP not allowing any fonts to be loaded.
if (!aUserFontEntry->mFontSet->IsFontLoadAllowed(aSrcURI, aPrincipal)) {
return nullptr;
}
// Ignore principal when looking up a data: URI.
nsIPrincipal* principal;
if (IgnorePrincipal(aSrcURI)) {
principal = nullptr;
} else {
principal = aPrincipal;
}
Entry* entry = sUserFonts->GetEntry(Key(aSrcURI, principal, aUserFontEntry,
aPrivate));
if (entry) {
return entry->GetFontEntry();
}
// The channel is never openend; to be conservative we use the most
// restrictive security flag: SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS.
nsCOMPtr<nsIChannel> chan;
if (NS_FAILED(NS_NewChannel(getter_AddRefs(chan),
aSrcURI,
aPrincipal,
nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS,
nsIContentPolicy::TYPE_FONT))) {
return nullptr;
}
nsCOMPtr<nsIJARChannel> jarchan = do_QueryInterface(chan);
if (!jarchan) {
return nullptr;
}
nsCOMPtr<nsIZipEntry> zipentry;
if (NS_FAILED(jarchan->GetZipEntry(getter_AddRefs(zipentry)))) {
return nullptr;
}
uint32_t crc32, length;
zipentry->GetCRC32(&crc32);
zipentry->GetRealSize(&length);
entry = sUserFonts->GetEntry(Key(crc32, length, aUserFontEntry, aPrivate));
if (entry) {
return entry->GetFontEntry();
}
return nullptr;
}
void
gfxUserFontSet::UserFontCache::Shutdown()
{
if (sUserFonts) {
delete sUserFonts;
sUserFonts = nullptr;
}
}
MOZ_DEFINE_MALLOC_SIZE_OF(UserFontsMallocSizeOf)
void
gfxUserFontSet::UserFontCache::Entry::ReportMemory(
nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aAnonymize)
{
MOZ_ASSERT(mFontEntry);
nsAutoCString path("explicit/gfx/user-fonts/font(");
if (aAnonymize) {
path.AppendPrintf("<anonymized-%p>", this);
} else {
NS_ConvertUTF16toUTF8 familyName(mFontEntry->mFamilyName);
path.AppendPrintf("family=%s", familyName.get());
if (mURI) {
nsCString spec = mURI->GetSpecOrDefault();
spec.ReplaceChar('/', '\\');
// Some fonts are loaded using horrendously-long data: URIs;
// truncate those before reporting them.
bool isData;
if (NS_SUCCEEDED(mURI->SchemeIs("data", &isData)) && isData &&
spec.Length() > 255) {
spec.Truncate(252);
spec.Append("...");
}
path.AppendPrintf(", url=%s", spec.get());
}
if (mPrincipal) {
nsCOMPtr<nsIURI> uri;
mPrincipal->GetURI(getter_AddRefs(uri));
if (uri) {
nsCString spec = uri->GetSpecOrDefault();
if (!spec.IsEmpty()) {
// Include a clue as to who loaded this resource. (Note
// that because of font entry sharing, other pages may now
// be using this resource, and the original page may not
// even be loaded any longer.)
spec.ReplaceChar('/', '\\');
path.AppendPrintf(", principal=%s", spec.get());
}
}
}
}
path.Append(')');
aHandleReport->Callback(
EmptyCString(), path,
nsIMemoryReporter::KIND_HEAP, nsIMemoryReporter::UNITS_BYTES,
mFontEntry->ComputedSizeOfExcludingThis(UserFontsMallocSizeOf),
NS_LITERAL_CSTRING("Memory used by @font-face resource."),
aData);
}
NS_IMPL_ISUPPORTS(gfxUserFontSet::UserFontCache::MemoryReporter,
nsIMemoryReporter)
NS_IMETHODIMP
gfxUserFontSet::UserFontCache::MemoryReporter::CollectReports(
nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aAnonymize)
{
if (!sUserFonts) {
return NS_OK;
}
for (auto it = sUserFonts->Iter(); !it.Done(); it.Next()) {
it.Get()->ReportMemory(aHandleReport, aData, aAnonymize);
}
MOZ_COLLECT_REPORT(
"explicit/gfx/user-fonts/cache-overhead", KIND_HEAP, UNITS_BYTES,
sUserFonts->ShallowSizeOfIncludingThis(UserFontsMallocSizeOf),
"Memory used by the @font-face cache, not counting the actual font "
"resources.");
return NS_OK;
}
#ifdef DEBUG_USERFONT_CACHE
void
gfxUserFontSet::UserFontCache::Entry::Dump()
{
nsresult rv;
nsAutoCString principalURISpec("(null)");
bool setDomain = false;
if (mPrincipal) {
nsCOMPtr<nsIURI> principalURI;
rv = mPrincipal->GetURI(getter_AddRefs(principalURI));
if (NS_SUCCEEDED(rv)) {
principalURI->GetSpec(principalURISpec);
}
nsCOMPtr<nsIURI> domainURI;
mPrincipal->GetDomain(getter_AddRefs(domainURI));
if (domainURI) {
setDomain = true;
}
}
NS_ASSERTION(mURI, "null URI in userfont cache entry");
printf("userfontcache fontEntry: %p fonturihash: %8.8x "
"family: %s domainset: %s principal: [%s]\n",
mFontEntry,
nsURIHashKey::HashKey(mURI),
NS_ConvertUTF16toUTF8(mFontEntry->FamilyName()).get(),
setDomain ? "true" : "false",
principalURISpec.get());
}
void
gfxUserFontSet::UserFontCache::Dump()
{
if (!sUserFonts) {
return;
}
printf("userfontcache dump count: %d ========\n", sUserFonts->Count());
for (auto it = sUserFonts->Iter(); !it.Done(); it.Next()) {
it.Get()->Dump();
}
printf("userfontcache dump ==================\n");
}
#endif
#undef LOG
#undef LOG_ENABLED
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