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gecko/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/. */
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif /* MOZ_LOGGING */
#include "prlog.h"
#include "gfxUserFontSet.h"
#include "gfxPlatform.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsNetUtil.h"
#include "nsICacheService.h"
#include "nsIProtocolHandler.h"
#include "nsIPrincipal.h"
#include "mozilla/Services.h"
#include "mozilla/Telemetry.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(GetUserFontsLog(), PR_LOG_DEBUG, args)
#define LOG_ENABLED() PR_LOG_TEST(GetUserFontsLog(), PR_LOG_DEBUG)
static uint64_t sFontSetGeneration = 0;
// TODO: support for unicode ranges not yet implemented
gfxProxyFontEntry::gfxProxyFontEntry(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
uint32_t aStretch,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
uint32_t aLanguageOverride,
gfxSparseBitSet *aUnicodeRanges)
: gfxFontEntry(NS_LITERAL_STRING("Proxy")),
mLoadingState(NOT_LOADING),
mUnsupportedFormat(false),
mLoader(nullptr)
{
mIsProxy = true;
mSrcList = aFontFaceSrcList;
mSrcIndex = 0;
mWeight = aWeight;
mStretch = aStretch;
mItalic = (aItalicStyle & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) != 0;
mFeatureSettings.AppendElements(aFeatureSettings);
mLanguageOverride = aLanguageOverride;
mIsUserFont = true;
}
gfxProxyFontEntry::~gfxProxyFontEntry()
{
}
gfxFont*
gfxProxyFontEntry::CreateFontInstance(const gfxFontStyle *aFontStyle, bool aNeedsBold)
{
// cannot create an actual font for a proxy entry
return nullptr;
}
gfxUserFontSet::gfxUserFontSet()
{
mFontFamilies.Init(5);
IncrementGeneration();
}
gfxUserFontSet::~gfxUserFontSet()
{
}
gfxFontEntry*
gfxUserFontSet::AddFontFace(const nsAString& aFamilyName,
const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
uint32_t aWeight,
uint32_t aStretch,
uint32_t aItalicStyle,
const nsTArray<gfxFontFeature>& aFeatureSettings,
const nsString& aLanguageOverride,
gfxSparseBitSet *aUnicodeRanges)
{
gfxProxyFontEntry *proxyEntry = nullptr;
nsAutoString key(aFamilyName);
ToLowerCase(key);
bool found;
if (aWeight == 0)
aWeight = NS_FONT_WEIGHT_NORMAL;
// stretch, italic/oblique ==> zero implies normal
gfxMixedFontFamily *family = mFontFamilies.GetWeak(key, &found);
if (!family) {
family = new gfxMixedFontFamily(aFamilyName);
mFontFamilies.Put(key, family);
}
// construct a new face and add it into the family
uint32_t languageOverride =
gfxFontStyle::ParseFontLanguageOverride(aLanguageOverride);
proxyEntry =
new gfxProxyFontEntry(aFontFaceSrcList, aWeight, aStretch,
aItalicStyle,
aFeatureSettings,
languageOverride,
aUnicodeRanges);
family->AddFontEntry(proxyEntry);
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
LOG(("userfonts (%p) added (%s) with style: %s weight: %d stretch: %d",
this, NS_ConvertUTF16toUTF8(aFamilyName).get(),
(aItalicStyle & NS_FONT_STYLE_ITALIC ? "italic" :
(aItalicStyle & NS_FONT_STYLE_OBLIQUE ? "oblique" : "normal")),
aWeight, aStretch));
}
#endif
return proxyEntry;
}
void
gfxUserFontSet::AddFontFace(const nsAString& aFamilyName,
gfxFontEntry *aFontEntry)
{
nsAutoString key(aFamilyName);
ToLowerCase(key);
bool found;
gfxMixedFontFamily *family = mFontFamilies.GetWeak(key, &found);
if (!family) {
family = new gfxMixedFontFamily(aFamilyName);
mFontFamilies.Put(key, family);
}
family->AddFontEntry(aFontEntry);
}
gfxFontEntry*
gfxUserFontSet::FindFontEntry(gfxFontFamily *aFamily,
const gfxFontStyle& aFontStyle,
bool& aNeedsBold,
bool& aWaitForUserFont)
{
aWaitForUserFont = false;
gfxMixedFontFamily *family = static_cast<gfxMixedFontFamily*>(aFamily);
gfxFontEntry* fe = family->FindFontForStyle(aFontStyle, aNeedsBold);
// if not a proxy, font has already been loaded
if (!fe->mIsProxy) {
return fe;
}
gfxProxyFontEntry *proxyEntry = static_cast<gfxProxyFontEntry*> (fe);
// if currently loading, return null for now
if (proxyEntry->mLoadingState > gfxProxyFontEntry::NOT_LOADING) {
aWaitForUserFont =
(proxyEntry->mLoadingState < gfxProxyFontEntry::LOADING_SLOWLY);
return nullptr;
}
// hasn't been loaded yet, start the load process
LoadStatus status;
// NOTE that if all sources in the entry fail, this will delete proxyEntry,
// so we cannot use it again if status==STATUS_END_OF_LIST
status = LoadNext(family, proxyEntry);
// if the load succeeded immediately, the font entry was replaced so
// search again
if (status == STATUS_LOADED) {
return family->FindFontForStyle(aFontStyle, aNeedsBold);
}
// check whether we should wait for load to complete before painting
// a fallback font -- but not if all sources failed (bug 633500)
aWaitForUserFont = (status != STATUS_END_OF_LIST) &&
(proxyEntry->mLoadingState < gfxProxyFontEntry::LOADING_SLOWLY);
// if either loading or an error occurred, return null
return nullptr;
}
// 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;
};
#ifdef MOZ_OTS_REPORT_ERRORS
struct OTSCallbackUserData {
gfxUserFontSet *mFontSet;
gfxMixedFontFamily *mFamily;
gfxProxyFontEntry *mProxy;
};
/* static */ bool
gfxUserFontSet::OTSMessage(void *aUserData, const char *format, ...)
{
va_list va;
va_start(va, format);
// buf should be more than adequate for any message OTS generates,
// so we don't worry about checking the result of vsnprintf()
char buf[512];
(void)vsnprintf(buf, sizeof(buf), format, va);
va_end(va);
OTSCallbackUserData *d = static_cast<OTSCallbackUserData*>(aUserData);
d->mFontSet->LogMessage(d->mFamily, d->mProxy, buf);
return false;
}
#endif
// 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*
gfxUserFontSet::SanitizeOpenTypeData(gfxMixedFontFamily *aFamily,
gfxProxyFontEntry *aProxy,
const uint8_t* aData, uint32_t aLength,
uint32_t& aSaneLength, bool aIsCompressed)
{
// limit output/expansion to 256MB
ExpandingMemoryStream output(aIsCompressed ? aLength * 2 : aLength,
1024 * 1024 * 256);
#ifdef MOZ_OTS_REPORT_ERRORS
OTSCallbackUserData userData;
userData.mFontSet = this;
userData.mFamily = aFamily;
userData.mProxy = aProxy;
#define ERROR_REPORTING_ARGS &gfxUserFontSet::OTSMessage, &userData,
#else
#define ERROR_REPORTING_ARGS
#endif
if (ots::Process(&output, aData, aLength,
ERROR_REPORTING_ARGS
true)) {
aSaneLength = output.Tell();
return static_cast<uint8_t*>(output.forget());
} else {
aSaneLength = 0;
return nullptr;
}
}
static void
StoreUserFontData(gfxFontEntry* aFontEntry, gfxProxyFontEntry* aProxy,
bool aPrivate, const nsAString& aOriginalName,
nsTArray<uint8_t>* aMetadata, uint32_t aMetaOrigLen)
{
if (!aFontEntry->mUserFontData) {
aFontEntry->mUserFontData = new gfxUserFontData;
}
gfxUserFontData* userFontData = aFontEntry->mUserFontData;
userFontData->mSrcIndex = aProxy->mSrcIndex;
const gfxFontFaceSrc& src = aProxy->mSrcList[aProxy->mSrcIndex];
if (src.mIsLocal) {
userFontData->mLocalName = src.mLocalName;
} else {
userFontData->mURI = src.mURI;
userFontData->mPrincipal = aProxy->mPrincipal;
}
userFontData->mPrivate = aPrivate;
userFontData->mFormat = src.mFormatFlags;
userFontData->mRealName = aOriginalName;
if (aMetadata) {
userFontData->mMetadata.SwapElements(*aMetadata);
userFontData->mMetaOrigLen = aMetaOrigLen;
}
}
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;
};
void
gfxUserFontSet::CopyWOFFMetadata(const uint8_t* aFontData,
uint32_t aLength,
nsTArray<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(WOFFHeader)) {
return;
}
const WOFFHeader* woff = reinterpret_cast<const WOFFHeader*>(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;
}
// 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 NS_Free().
bool
gfxUserFontSet::OnLoadComplete(gfxMixedFontFamily *aFamily,
gfxProxyFontEntry *aProxy,
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
aProxy->mLoader = nullptr;
// download successful, make platform font using font data
if (NS_SUCCEEDED(aDownloadStatus)) {
gfxFontEntry *fe = LoadFont(aFamily, aProxy, aFontData, aLength);
aFontData = nullptr;
if (fe) {
IncrementGeneration();
return true;
}
} else {
// download failed
LogMessage(aFamily, aProxy,
"download failed", nsIScriptError::errorFlag,
aDownloadStatus);
}
if (aFontData) {
NS_Free((void*)aFontData);
}
// error occurred, load next src
(void)LoadNext(aFamily, aProxy);
// 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;
}
gfxUserFontSet::LoadStatus
gfxUserFontSet::LoadNext(gfxMixedFontFamily *aFamily,
gfxProxyFontEntry *aProxyEntry)
{
uint32_t numSrc = aProxyEntry->mSrcList.Length();
NS_ASSERTION(aProxyEntry->mSrcIndex < numSrc,
"already at the end of the src list for user font");
if (aProxyEntry->mLoadingState == gfxProxyFontEntry::NOT_LOADING) {
aProxyEntry->mLoadingState = gfxProxyFontEntry::LOADING_STARTED;
aProxyEntry->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
aProxyEntry->mSrcIndex++;
}
// load each src entry in turn, until a local face is found
// or a download begins successfully
while (aProxyEntry->mSrcIndex < numSrc) {
const gfxFontFaceSrc& currSrc = aProxyEntry->mSrcList[aProxyEntry->mSrcIndex];
// src local ==> lookup and load immediately
if (currSrc.mIsLocal) {
gfxFontEntry *fe =
gfxPlatform::GetPlatform()->LookupLocalFont(aProxyEntry,
currSrc.mLocalName);
if (fe) {
LOG(("userfonts (%p) [src %d] loaded local: (%s) for (%s) gen: %8.8x\n",
this, aProxyEntry->mSrcIndex,
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
NS_ConvertUTF16toUTF8(aFamily->Name()).get(),
uint32_t(mGeneration)));
fe->mFeatureSettings.AppendElements(aProxyEntry->mFeatureSettings);
fe->mLanguageOverride = aProxyEntry->mLanguageOverride;
// 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, aProxyEntry, false, nsString(), nullptr, 0);
ReplaceFontEntry(aFamily, aProxyEntry, fe);
return STATUS_LOADED;
} else {
LOG(("userfonts (%p) [src %d] failed local: (%s) for (%s)\n",
this, aProxyEntry->mSrcIndex,
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
NS_ConvertUTF16toUTF8(aFamily->Name()).get()));
}
}
// src url ==> start the load process
else {
if (gfxPlatform::GetPlatform()->IsFontFormatSupported(currSrc.mURI,
currSrc.mFormatFlags)) {
nsIPrincipal *principal = nullptr;
bool bypassCache;
nsresult rv = CheckFontLoad(&currSrc, &principal, &bypassCache);
if (NS_SUCCEEDED(rv) && principal != nullptr) {
if (!bypassCache) {
// see if we have an existing entry for this source
gfxFontEntry *fe =
UserFontCache::GetFont(currSrc.mURI, principal,
aProxyEntry,
GetPrivateBrowsing());
if (fe) {
ReplaceFontEntry(aFamily, aProxyEntry, fe);
return STATUS_LOADED;
}
}
// record the principal returned by CheckFontLoad,
// for use when creating a channel
// and when caching the loaded entry
aProxyEntry->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 = SyncLoadFontData(aProxyEntry, &currSrc,
buffer, bufferLength);
if (NS_SUCCEEDED(rv) && LoadFont(aFamily, aProxyEntry,
buffer, bufferLength)) {
return STATUS_LOADED;
} else {
LogMessage(aFamily, aProxyEntry,
"font load failed",
nsIScriptError::errorFlag, rv);
}
} else {
// otherwise load font async
rv = StartLoad(aFamily, aProxyEntry, &currSrc);
if (NS_SUCCEEDED(rv)) {
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
currSrc.mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] loading uri: (%s) for (%s)\n",
this, aProxyEntry->mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(aFamily->Name()).get()));
}
#endif
return STATUS_LOADING;
} else {
LogMessage(aFamily, aProxyEntry,
"download failed",
nsIScriptError::errorFlag, rv);
}
}
} else {
LogMessage(aFamily, aProxyEntry, "download not allowed",
nsIScriptError::errorFlag, rv);
}
} else {
// We don't log a warning to the web console yet,
// as another source may load successfully
aProxyEntry->mUnsupportedFormat = true;
}
}
aProxyEntry->mSrcIndex++;
}
if (aProxyEntry->mUnsupportedFormat) {
LogMessage(aFamily, aProxyEntry, "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",
this, NS_ConvertUTF16toUTF8(aFamily->Name()).get()));
aProxyEntry->mLoadingState = gfxProxyFontEntry::LOADING_FAILED;
return STATUS_END_OF_LIST;
}
void
gfxUserFontSet::IncrementGeneration()
{
// add one, increment again if zero
++sFontSetGeneration;
if (sFontSetGeneration == 0)
++sFontSetGeneration;
mGeneration = sFontSetGeneration;
}
gfxFontEntry*
gfxUserFontSet::LoadFont(gfxMixedFontFamily *aFamily,
gfxProxyFontEntry *aProxy,
const uint8_t *aFontData, uint32_t &aLength)
{
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(aFamily, aProxy, aFontData, aLength, saneLen,
fontType == GFX_USERFONT_WOFF);
if (!saneData) {
LogMessage(aFamily, aProxy, "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(aProxy,
saneData,
saneLen);
if (!fe) {
LogMessage(aFamily, aProxy, "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.
nsTArray<uint8_t> metadata;
uint32_t metaOrigLen = 0;
if (fontType == GFX_USERFONT_WOFF) {
CopyWOFFMetadata(aFontData, aLength, &metadata, &metaOrigLen);
}
// copy OpenType feature/language settings from the proxy to the
// newly-created font entry
fe->mFeatureSettings.AppendElements(aProxy->mFeatureSettings);
fe->mLanguageOverride = aProxy->mLanguageOverride;
StoreUserFontData(fe, aProxy, GetPrivateBrowsing(),
originalFullName, &metadata, metaOrigLen);
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
aProxy->mSrcList[aProxy->mSrcIndex].mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] loaded uri: (%s) for (%s) gen: %8.8x\n",
this, aProxy->mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(aFamily->Name()).get(),
uint32_t(mGeneration)));
}
#endif
ReplaceFontEntry(aFamily, aProxy, fe);
UserFontCache::CacheFont(fe);
} else {
#ifdef PR_LOGGING
if (LOG_ENABLED()) {
nsAutoCString fontURI;
aProxy->mSrcList[aProxy->mSrcIndex].mURI->GetSpec(fontURI);
LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s)"
" error making platform font\n",
this, aProxy->mSrcIndex, fontURI.get(),
NS_ConvertUTF16toUTF8(aFamily->Name()).get()));
}
#endif
}
// The downloaded data can now be discarded; the font entry is using the
// sanitized copy
NS_Free((void*)aFontData);
return fe;
}
gfxFontFamily*
gfxUserFontSet::GetFamily(const nsAString& aFamilyName) const
{
nsAutoString key(aFamilyName);
ToLowerCase(key);
return mFontFamilies.GetWeak(key);
}
struct FindFamilyCallbackData {
gfxFontEntry *mFontEntry;
gfxFontFamily *mFamily;
};
static PLDHashOperator
FindFamilyCallback(const nsAString& aName,
gfxMixedFontFamily* aFamily,
void* aUserArg)
{
FindFamilyCallbackData *d = static_cast<FindFamilyCallbackData*>(aUserArg);
if (aFamily->ContainsFace(d->mFontEntry)) {
d->mFamily = aFamily;
return PL_DHASH_STOP;
}
return PL_DHASH_NEXT;
}
gfxFontFamily*
gfxUserFontSet::FindFamilyFor(gfxFontEntry* aFontEntry) const
{
FindFamilyCallbackData d = { aFontEntry, nullptr };
mFontFamilies.EnumerateRead(FindFamilyCallback, &d);
return d.mFamily;
}
///////////////////////////////////////////////////////////////////////////////
// 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_ISUPPORTS1(gfxUserFontSet::UserFontCache::Flusher, nsIObserver)
PLDHashOperator
gfxUserFontSet::UserFontCache::Entry::RemoveIfPrivate(Entry* aEntry,
void* aUserData)
{
return aEntry->mPrivate ? PL_DHASH_REMOVE : PL_DHASH_NEXT;
}
NS_IMETHODIMP
gfxUserFontSet::UserFontCache::Flusher::Observe(nsISupports* aSubject,
const char* aTopic,
const PRUnichar* aData)
{
if (!sUserFonts) {
return NS_OK;
}
if (!strcmp(aTopic, NS_CACHESERVICE_EMPTYCACHE_TOPIC_ID)) {
sUserFonts->Clear();
} else if (!strcmp(aTopic, "last-pb-context-exited")) {
sUserFonts->EnumerateEntries(Entry::RemoveIfPrivate, nullptr);
} else {
NS_NOTREACHED("unexpected topic");
}
return NS_OK;
}
bool
gfxUserFontSet::UserFontCache::Entry::KeyEquals(const KeyTypePointer aKey) const
{
bool equal;
if (NS_FAILED(mURI->Equals(aKey->mURI, &equal)) || !equal) {
return false;
}
if (NS_FAILED(mPrincipal->Equals(aKey->mPrincipal, &equal)) || !equal) {
return false;
}
if (mPrivate != aKey->mPrivate) {
return false;
}
const gfxFontEntry *fe = aKey->mFontEntry;
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)
{
NS_ASSERTION(aFontEntry->mFamilyName.Length() != 0,
"caching a font associated with no family yet");
if (!sUserFonts) {
sUserFonts = new nsTHashtable<Entry>;
sUserFonts->Init();
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
Flusher *flusher = new Flusher;
obs->AddObserver(flusher, NS_CACHESERVICE_EMPTYCACHE_TOPIC_ID,
false);
obs->AddObserver(flusher, "last-pb-context-exited", false);
}
}
gfxUserFontData *data = aFontEntry->mUserFontData;
sUserFonts->PutEntry(Key(data->mURI, data->mPrincipal, aFontEntry,
data->mPrivate));
}
void
gfxUserFontSet::UserFontCache::ForgetFont(gfxFontEntry *aFontEntry)
{
if (!sUserFonts) {
// if we've already deleted the cache (i.e. during shutdown),
// just ignore this
return;
}
gfxUserFontData *data = aFontEntry->mUserFontData;
if (data) {
sUserFonts->RemoveEntry(Key(data->mURI, data->mPrincipal, aFontEntry,
data->mPrivate));
}
}
gfxFontEntry*
gfxUserFontSet::UserFontCache::GetFont(nsIURI *aSrcURI,
nsIPrincipal *aPrincipal,
gfxProxyFontEntry *aProxy,
bool aPrivate)
{
if (!sUserFonts) {
return nullptr;
}
Entry* entry = sUserFonts->GetEntry(Key(aSrcURI, aPrincipal, aProxy,
aPrivate));
if (entry) {
return entry->GetFontEntry();
}
return nullptr;
}
void
gfxUserFontSet::UserFontCache::Shutdown()
{
if (sUserFonts) {
delete sUserFonts;
sUserFonts = nullptr;
}
}
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