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gecko-dev/gfx/thebes/gfxUserFontSet.cpp

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43 KiB
C++
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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 "prlog.h"
#include "gfxUserFontSet.h"
#include "gfxPlatform.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/gfx/2D.h"
#include "gfxPlatformFontList.h"
#include "opentype-sanitiser.h"
#include "ots-memory-stream.h"
using namespace mozilla;
#ifdef PR_LOGGING
PRLogModuleInfo*
gfxUserFontSet::GetUserFontsLog()
{
static PRLogModuleInfo* sLog;
if (!sLog)
sLog = PR_NewLogModule("userfonts");
return sLog;
}
#endif /* PR_LOGGING */
#define LOG(args) PR_LOG(gfxUserFontSet::GetUserFontsLog(), PR_LOG_DEBUG, args)
#define LOG_ENABLED() PR_LOG_TEST(gfxUserFontSet::GetUserFontsLog(), PR_LOG_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 = NS_Alloc(mLength);
}
~ExpandingMemoryStream() {
NS_Free(mPtr);
}
// return the buffer, and give up ownership of it
// so the caller becomes responsible to call NS_Free
// when finished with it
void* forget() {
void* p = mPtr;
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 = NS_Realloc(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,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges)
: gfxFontEntry(NS_LITERAL_STRING("userfont")),
mUserFontLoadState(STATUS_NOT_LOADED),
mFontDataLoadingState(NOT_LOADING),
mUnsupportedFormat(false),
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;
// XXX Currently, we don't distinguish 'italic' and 'oblique' styles;
// we need to fix this. (Bug 543715)
mItalic = (aItalicStyle & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) != 0;
mFeatureSettings.AppendElements(aFeatureSettings);
mLanguageOverride = aLanguageOverride;
if (aUnicodeRanges &&
Preferences::GetBool("layout.css.unicode-range.enabled")) {
mCharacterMap = new gfxCharacterMap(*aUnicodeRanges);
}
}
gfxUserFontEntry::~gfxUserFontEntry()
{
}
bool
gfxUserFontEntry::Matches(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges)
{
// XXX font entries don't distinguish italic from oblique (bug 543715)
bool isItalic =
(aItalicStyle & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) != 0;
return mWeight == aWeight &&
mStretch == aStretch &&
mItalic == isItalic &&
mFeatureSettings == aFeatureSettings &&
mLanguageOverride == aLanguageOverride &&
mSrcList == aFontFaceSrcList &&
((!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) {}
virtual ots::TableAction GetTableAction(uint32_t aTag) MOZ_OVERRIDE {
// preserve Graphite, color glyph and SVG tables
if (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 MOZ_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;
};
// 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)) {
aSaneLength = output.Tell();
return static_cast<uint8_t*>(output.forget());
} else {
aSaneLength = 0;
return nullptr;
}
}
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 = new gfxUserFontData;
}
gfxUserFontData* userFontData = aFontEntry->mUserFontData;
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;
}
}
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);
} 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)) {
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) {
gfxFontEntry* fe =
gfxPlatform::GetPlatform()->LookupLocalFont(currSrc.mLocalName,
mWeight,
mStretch,
mItalic);
mFontSet->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);
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);
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);
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) {
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
currSrc.mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] loading uri: (%s) for (%s)\n",
mFontSet, mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
#endif
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);
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;
}
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);
// 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;
const uint8_t* saneData =
SanitizeOpenTypeData(aFontData, aLength, saneLen, fontType);
if (!saneData) {
mFontSet->LogMessage(this, "rejected by sanitizer");
}
if (saneData) {
// 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);
// Here ownership of saneData is passed to the platform,
// which will delete it when no longer required
fe = gfxPlatform::GetPlatform()->MakePlatformFont(mName,
mWeight,
mStretch,
mItalic,
saneData,
saneLen);
if (!fe) {
mFontSet->LogMessage(this, "not usable by platform");
}
}
if (fe) {
// 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);
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
mSrcList[mSrcIndex].mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] loaded uri: (%s) for (%s) gen: %8.8x\n",
mFontSet, mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(mFamilyName).get(),
uint32_t(mFontSet->mGeneration)));
}
#endif
mPlatformFontEntry = fe;
SetLoadState(STATUS_LOADED);
gfxUserFontSet::UserFontCache::CacheFont(fe);
} else {
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
mSrcList[mSrcIndex].mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s)"
" error making platform font\n",
mFontSet, mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(mFamilyName).get()));
}
#endif
}
// The downloaded data can now be discarded; the font entry is using the
// sanitized copy
moz_free((void*)aFontData);
return fe != nullptr;
}
void
gfxUserFontEntry::Load()
{
if (mUserFontLoadState == STATUS_NOT_LOADED) {
LoadNextSrc();
}
}
// 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 moz_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)) {
bool loaded = LoadPlatformFont(aFontData, aLength);
aFontData = nullptr;
if (loaded) {
mFontSet->IncrementGeneration();
return true;
}
} else {
// download failed
mFontSet->LogMessage(this,
"download failed", nsIScriptError::errorFlag,
aDownloadStatus);
}
if (aFontData) {
moz_free((void*)aFontData);
}
// error occurred, load next src
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
mFontSet->IncrementGeneration();
return true;
}
gfxUserFontSet::gfxUserFontSet()
: mFontFamilies(4), mLocalRulesUsed(false)
{
IncrementGeneration(true);
gfxPlatformFontList* fp = gfxPlatformFontList::PlatformFontList();
if (fp) {
fp->AddUserFontSet(this);
}
// This is a one-time global switch for OTS. However, as long as we use
// a preference to control the availability of WOFF2 support, we will
// not actually pass any WOFF2 data to OTS unless the pref is on.
ots::EnableWOFF2();
}
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,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges)
{
nsRefPtr<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, aItalicStyle,
aFeatureSettings, aLanguageOverride,
aUnicodeRanges);
}
if (!entry) {
entry = CreateUserFontEntry(aFontFaceSrcList, aWeight, aStretch,
aItalicStyle, aFeatureSettings,
aLanguageOverride, aUnicodeRanges);
entry->mFamilyName = aFamilyName;
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
LOG(("userfonts (%p) created \"%s\" (%p) with style: %s weight: %d "
"stretch: %d",
this, NS_ConvertUTF16toUTF8(aFamilyName).get(), entry.get(),
(aItalicStyle & NS_FONT_STYLE_ITALIC ? "italic" :
(aItalicStyle & NS_FONT_STYLE_OBLIQUE ? "oblique" : "normal")),
aWeight, aStretch));
}
#endif
}
return entry.forget();
}
already_AddRefed<gfxUserFontEntry>
gfxUserFontSet::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> userFontEntry =
new gfxUserFontEntry(this, aFontFaceSrcList, aWeight,
aStretch, aItalicStyle, aFeatureSettings,
aLanguageOverride, aUnicodeRanges);
return userFontEntry.forget();
}
gfxUserFontEntry*
gfxUserFontSet::FindExistingUserFontEntry(
gfxUserFontFamily* aFamily,
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
int32_t aStretch,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet* aUnicodeRanges)
{
MOZ_ASSERT(aWeight != 0,
"aWeight must not be 0; use NS_FONT_WEIGHT_NORMAL instead");
nsTArray<nsRefPtr<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, aItalicStyle,
aFeatureSettings, aLanguageOverride,
aUnicodeRanges)) {
continue;
}
return existingUserFontEntry;
}
return nullptr;
}
void
gfxUserFontSet::AddUserFontEntry(const nsAString& aFamilyName,
gfxUserFontEntry* aUserFontEntry)
{
gfxUserFontFamily* family = GetFamily(aFamilyName);
family->AddFontEntry(aUserFontEntry);
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
LOG(("userfonts (%p) added \"%s\" (%p)",
this, NS_ConvertUTF16toUTF8(aFamilyName).get(), aUserFontEntry));
}
#endif
}
gfxUserFontEntry*
gfxUserFontSet::FindUserFontEntryAndLoad(gfxFontFamily* aFamily,
const gfxFontStyle& aFontStyle,
bool& aNeedsBold,
bool& aWaitForUserFont)
{
aWaitForUserFont = false;
gfxFontEntry* fe = aFamily->FindFontForStyle(aFontStyle, aNeedsBold);
NS_ASSERTION(!fe || fe->mIsUserFontContainer,
"should only have userfont entries in userfont families");
if (!fe) {
return nullptr;
}
gfxUserFontEntry* userFontEntry = static_cast<gfxUserFontEntry*>(fe);
// start the load if it hasn't been loaded
userFontEntry->Load();
if (userFontEntry->GetPlatformFontEntry()) {
return userFontEntry;
}
aWaitForUserFont = userFontEntry->WaitForUserFont();
return nullptr;
}
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) {
DoRebuildUserFontSet();
}
}
gfxUserFontFamily*
gfxUserFontSet::LookupFamily(const nsAString& aFamilyName) const
{
nsAutoString key(aFamilyName);
ToLowerCase(key);
return mFontFamilies.GetWeak(key);
}
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)
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::RemoveUnlessPersistent(Entry* aEntry,
void* aUserData)
{
return aEntry->mPersistence == kPersistent ? PL_DHASH_NEXT :
PL_DHASH_REMOVE;
}
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::RemoveIfPrivate(Entry* aEntry,
void* aUserData)
{
return aEntry->mPrivate ? PL_DHASH_REMOVE : PL_DHASH_NEXT;
}
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::RemoveIfMatches(Entry* aEntry,
void* aUserData)
{
return aEntry->GetFontEntry() == static_cast<gfxFontEntry*>(aUserData) ?
PL_DHASH_REMOVE : PL_DHASH_NEXT;
}
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::DisconnectSVG(Entry* aEntry,
void* aUserData)
{
aEntry->GetFontEntry()->DisconnectSVG();
return PL_DHASH_NEXT;
}
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")) {
sUserFonts->EnumerateEntries(Entry::RemoveUnlessPersistent, nullptr);
} else if (!strcmp(aTopic, "last-pb-context-exited")) {
sUserFonts->EnumerateEntries(Entry::RemoveIfPrivate, nullptr);
} else if (!strcmp(aTopic, "xpcom-shutdown")) {
sUserFonts->EnumerateEntries(Entry::DisconnectSVG, nullptr);
} 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->mItalic != fe->mItalic ||
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");
gfxUserFontData* data = aFontEntry->mUserFontData;
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);
}
}
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).
sUserFonts->EnumerateEntries(
gfxUserFontSet::UserFontCache::Entry::RemoveIfMatches, aFontEntry);
#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) {
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();
}
nsCOMPtr<nsIChannel> chan;
if (NS_FAILED(NS_NewChannel(getter_AddRefs(chan),
aSrcURI,
aPrincipal,
nsILoadInfo::SEC_NORMAL,
nsIContentPolicy::TYPE_OTHER))) {
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;
}
}
#ifdef DEBUG_USERFONT_CACHE
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::DumpEntry(Entry* aEntry, void* aUserData)
{
nsresult rv;
nsAutoCString principalURISpec("(null)");
bool setDomain = false;
if (aEntry->mPrincipal) {
nsCOMPtr<nsIURI> principalURI;
rv = aEntry->mPrincipal->GetURI(getter_AddRefs(principalURI));
if (NS_SUCCEEDED(rv)) {
principalURI->GetSpec(principalURISpec);
}
nsCOMPtr<nsIURI> domainURI;
aEntry->mPrincipal->GetDomain(getter_AddRefs(domainURI));
if (domainURI) {
setDomain = true;
}
}
NS_ASSERTION(aEntry->mURI, "null URI in userfont cache entry");
printf("userfontcache fontEntry: %p fonturihash: %8.8x family: %s domainset: %s principal: [%s]\n",
aEntry->mFontEntry,
nsURIHashKey::HashKey(aEntry->mURI),
NS_ConvertUTF16toUTF8(aEntry->mFontEntry->FamilyName()).get(),
(setDomain ? "true" : "false"),
principalURISpec.get()
);
return PL_DHASH_NEXT;
}
void
gfxUserFontSet::UserFontCache::Dump()
{
if (!sUserFonts) {
return;
}
printf("userfontcache dump count: %d ========\n", sUserFonts->Count());
sUserFonts->EnumerateEntries(Entry::DumpEntry, nullptr);
printf("userfontcache dump ==================\n");
}
#endif
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