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gfxFT2FontList.cpp
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/ArrayUtils.h"
#include "mozilla/Base64.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/ContentChild.h"
#include "gfxAndroidPlatform.h"
#include "mozilla/Omnijar.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsReadableUtils.h"
#include "nsXULAppAPI.h"
#include <dirent.h>
#include <android/log.h>
#define ALOG(args...) __android_log_print(ANDROID_LOG_INFO, "Gecko", ##args)
#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_TRUETYPE_TAGS_H
#include FT_TRUETYPE_TABLES_H
#include FT_MULTIPLE_MASTERS_H
#include "cairo-ft.h"
#include "gfxFT2FontList.h"
#include "gfxFT2Fonts.h"
#include "gfxFT2Utils.h"
#include "gfxUserFontSet.h"
#include "gfxFontUtils.h"
#include "SharedFontList-impl.h"
#include "harfbuzz/hb-ot.h" // for name ID constants
#include "nsServiceManagerUtils.h"
#include "nsIObserverService.h"
#include "nsTArray.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsMemory.h"
#include "nsPresContext.h"
#include "gfxFontConstants.h"
#include "mozilla/EndianUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/Telemetry.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#ifdef MOZ_WIDGET_ANDROID
# include "AndroidBuild.h"
# include "mozilla/jni/Utils.h"
# include <dlfcn.h>
#endif
using namespace mozilla;
using namespace mozilla::gfx;
static LazyLogModule sFontInfoLog("fontInfoLog");
#undef LOG
#define LOG(args) MOZ_LOG(sFontInfoLog, mozilla::LogLevel::Debug, args)
#define LOG_ENABLED() MOZ_LOG_TEST(sFontInfoLog, mozilla::LogLevel::Debug)
static __inline void BuildKeyNameFromFontName(nsACString& aName) {
ToLowerCase(aName);
}
// Helper to access the FT_Face for a given FT2FontEntry,
// creating a temporary face if the entry does not have one yet.
// This allows us to read font names, tables, etc if necessary
// without permanently instantiating a freetype face and consuming
// memory long-term.
// This may fail (resulting in a null FT_Face), e.g. if it fails to
// allocate memory to uncompress a font from omnijar.
already_AddRefed<SharedFTFace> FT2FontEntry::GetFTFace(bool aCommit) {
if (mFTFace) {
// Create a new reference, and return it.
RefPtr<SharedFTFace> face(mFTFace);
return face.forget();
}
NS_ASSERTION(!mFilename.IsEmpty(),
"can't use GetFTFace for fonts without a filename");
// A relative path (no initial "/") means this is a resource in
// omnijar, not an installed font on the device.
// The NS_ASSERTIONs here should never fail, as the resource must have
// been read successfully during font-list initialization or we'd never
// have created the font entry. The only legitimate runtime failure
// here would be memory allocation, in which case mFace remains null.
RefPtr<SharedFTFace> face;
if (mFilename[0] != '/') {
RefPtr<nsZipArchive> reader = Omnijar::GetReader(Omnijar::Type::GRE);
nsZipItem* item = reader->GetItem(mFilename.get());
NS_ASSERTION(item, "failed to find zip entry");
uint32_t bufSize = item->RealSize();
uint8_t* fontDataBuf = static_cast<uint8_t*>(malloc(bufSize));
if (fontDataBuf) {
nsZipCursor cursor(item, reader, fontDataBuf, bufSize);
cursor.Copy(&bufSize);
NS_ASSERTION(bufSize == item->RealSize(), "error reading bundled font");
RefPtr<FTUserFontData> ufd = new FTUserFontData(fontDataBuf, bufSize);
face = ufd->CloneFace(mFTFontIndex);
if (!face) {
NS_WARNING("failed to create freetype face");
return nullptr;
}
}
} else {
RefPtr<FTUserFontData> fd = new FTUserFontData(mFilename.get());
face = fd->CloneFace(mFTFontIndex);
if (!face) {
NS_WARNING("failed to create freetype face");
return nullptr;
}
if (FT_Err_Ok != FT_Select_Charmap(face->GetFace(), FT_ENCODING_UNICODE) &&
FT_Err_Ok !=
FT_Select_Charmap(face->GetFace(), FT_ENCODING_MS_SYMBOL)) {
NS_WARNING("failed to select Unicode or symbol charmap");
}
}
if (aCommit) {
if (mFTFace.compareExchange(nullptr, face.get())) {
// The reference we created is now owned by mFTFace.
Unused << face.forget();
} else {
// We lost a race! Just discard our new face and use the existing one.
}
}
// Create a new reference, and return it.
face = mFTFace;
return face.forget();
}
FTUserFontData* FT2FontEntry::GetUserFontData() {
if (SharedFTFace* face = mFTFace) {
return static_cast<FTUserFontData*>(face->GetData());
}
return nullptr;
}
/*
* FT2FontEntry
* gfxFontEntry subclass corresponding to a specific face that can be
* rendered by freetype. This is associated with a face index in a
* file (normally a .ttf/.otf file holding a single face, but in principle
* there could be .ttc files with multiple faces).
* The FT2FontEntry can create the necessary FT_Face on demand, and can
* then create a Cairo font_face and scaled_font for drawing.
*/
FT2FontEntry::~FT2FontEntry() {
if (mMMVar) {
SharedFTFace* face = mFTFace;
FT_Done_MM_Var(face->GetFace()->glyph->library, mMMVar);
}
if (mFTFace) {
auto face = mFTFace.exchange(nullptr);
NS_IF_RELEASE(face);
}
}
gfxFontEntry* FT2FontEntry::Clone() const {
MOZ_ASSERT(!IsUserFont(), "we can only clone installed fonts!");
FT2FontEntry* fe = new FT2FontEntry(Name());
fe->mFilename = mFilename;
fe->mFTFontIndex = mFTFontIndex;
fe->mWeightRange = mWeightRange;
fe->mStretchRange = mStretchRange;
fe->mStyleRange = mStyleRange;
return fe;
}
gfxFont* FT2FontEntry::CreateFontInstance(const gfxFontStyle* aStyle) {
RefPtr<SharedFTFace> face = GetFTFace(true);
if (!face) {
return nullptr;
}
if (face->GetFace()->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) {
// Resolve variations from entry (descriptor) and style (property)
AutoTArray<gfxFontVariation, 8> settings;
GetVariationsForStyle(settings, aStyle ? *aStyle : gfxFontStyle());
// If variations are present, we will not use our cached mFTFace
// but always create a new one as it will have custom variation
// coordinates applied.
if (!settings.IsEmpty()) {
// Create a separate FT_Face because we need to apply custom
// variation settings to it.
RefPtr<SharedFTFace> varFace;
if (!mFilename.IsEmpty() && mFilename[0] == '/') {
varFace =
Factory::NewSharedFTFace(nullptr, mFilename.get(), mFTFontIndex);
} else {
varFace = face->GetData()->CloneFace(mFTFontIndex);
}
if (varFace) {
gfxFT2FontBase::SetupVarCoords(GetMMVar(), settings,
varFace->GetFace());
face = std::move(varFace);
}
}
}
int loadFlags = gfxPlatform::GetPlatform()->FontHintingEnabled()
? FT_LOAD_DEFAULT
: (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
if (face->GetFace()->face_flags & FT_FACE_FLAG_TRICKY) {
loadFlags &= ~FT_LOAD_NO_AUTOHINT;
}
RefPtr<UnscaledFontFreeType> unscaledFont(mUnscaledFont);
if (!unscaledFont) {
RefPtr<SharedFTFace> origFace(mFTFace);
unscaledFont =
!mFilename.IsEmpty() && mFilename[0] == '/'
? new UnscaledFontFreeType(mFilename.BeginReading(), mFTFontIndex,
std::move(origFace))
: new UnscaledFontFreeType(std::move(origFace));
mUnscaledFont = unscaledFont;
}
gfxFont* font =
new gfxFT2Font(unscaledFont, std::move(face), this, aStyle, loadFlags);
return font;
}
/* static */
FT2FontEntry* FT2FontEntry::CreateFontEntry(
const nsACString& aFontName, WeightRange aWeight, StretchRange aStretch,
SlantStyleRange aStyle, const uint8_t* aFontData, uint32_t aLength) {
// Ownership of aFontData is passed in here; the fontEntry must
// retain it as long as the FT_Face needs it, and ensure it is
// eventually deleted.
RefPtr<FTUserFontData> ufd = new FTUserFontData(aFontData, aLength);
RefPtr<SharedFTFace> face = ufd->CloneFace();
if (!face) {
return nullptr;
}
// Create our FT2FontEntry, which inherits the name of the userfont entry
// as it's not guaranteed that the face has valid names (bug 737315)
FT2FontEntry* fe =
FT2FontEntry::CreateFontEntry(aFontName, nullptr, 0, nullptr);
if (fe) {
fe->mFTFace = face.forget().take(); // mFTFace takes ownership.
fe->mStyleRange = aStyle;
fe->mWeightRange = aWeight;
fe->mStretchRange = aStretch;
fe->mIsDataUserFont = true;
}
return fe;
}
/* static */
FT2FontEntry* FT2FontEntry::CreateFontEntry(const FontListEntry& aFLE) {
FT2FontEntry* fe = new FT2FontEntry(aFLE.faceName());
fe->mFilename = aFLE.filepath();
fe->mFTFontIndex = aFLE.index();
fe->mWeightRange = WeightRange::FromScalar(aFLE.weightRange());
fe->mStretchRange = StretchRange::FromScalar(aFLE.stretchRange());
fe->mStyleRange = SlantStyleRange::FromScalar(aFLE.styleRange());
return fe;
}
// Extract font entry properties from an hb_face_t
static void SetPropertiesFromFace(gfxFontEntry* aFontEntry,
const hb_face_t* aFace) {
// OS2 width class to CSS 'stretch' mapping from
// https://docs.microsoft.com/en-gb/typography/opentype/spec/os2#uswidthclass
const float kOS2WidthToStretch[] = {
100, // (invalid, treat as normal)
50, // Ultra-condensed
62.5, // Extra-condensed
75, // Condensed
87.5, // Semi-condensed
100, // Normal
112.5, // Semi-expanded
125, // Expanded
150, // Extra-expanded
200 // Ultra-expanded
};
// Get the macStyle field from the 'head' table
gfxFontUtils::AutoHBBlob headBlob(
hb_face_reference_table(aFace, HB_TAG('h', 'e', 'a', 'd')));
unsigned int len;
const char* data = hb_blob_get_data(headBlob, &len);
uint16_t style = 0;
if (len >= sizeof(HeadTable)) {
const HeadTable* head = reinterpret_cast<const HeadTable*>(data);
style = head->macStyle;
}
// Get the OS/2 table for weight & width fields
gfxFontUtils::AutoHBBlob os2blob(
hb_face_reference_table(aFace, HB_TAG('O', 'S', '/', '2')));
data = hb_blob_get_data(os2blob, &len);
uint16_t os2weight = 400;
float stretch = 100.0;
if (len >= offsetof(OS2Table, fsType)) {
const OS2Table* os2 = reinterpret_cast<const OS2Table*>(data);
os2weight = os2->usWeightClass;
uint16_t os2width = os2->usWidthClass;
if (os2width < ArrayLength(kOS2WidthToStretch)) {
stretch = kOS2WidthToStretch[os2width];
}
}
aFontEntry->mStyleRange = SlantStyleRange(
(style & 2) ? FontSlantStyle::ITALIC : FontSlantStyle::NORMAL);
aFontEntry->mWeightRange = WeightRange(FontWeight::FromInt(int(os2weight)));
aFontEntry->mStretchRange = StretchRange(FontStretch::FromFloat(stretch));
// For variable fonts, update the style/weight/stretch attributes if the
// corresponding variation axes are present.
aFontEntry->SetupVariationRanges();
}
// Used to create the font entry for installed faces on the device,
// when iterating over the fonts directories.
// We use the hb_face_t to retrieve the details needed for the font entry,
// but do *not* save a reference to it, nor create a cairo face.
/* static */
FT2FontEntry* FT2FontEntry::CreateFontEntry(const nsACString& aName,
const char* aFilename,
uint8_t aIndex,
const hb_face_t* aFace) {
FT2FontEntry* fe = new FT2FontEntry(aName);
fe->mFilename = aFilename;
fe->mFTFontIndex = aIndex;
if (aFace) {
SetPropertiesFromFace(fe, aFace);
} else {
// If nullptr is passed for aFace, the caller is intending to override
// these attributes anyway. We just set defaults here to be safe.
fe->mStyleRange = SlantStyleRange(FontSlantStyle::NORMAL);
fe->mWeightRange = WeightRange(FontWeight::NORMAL);
fe->mStretchRange = StretchRange(FontStretch::NORMAL);
}
return fe;
}
FT2FontEntry* gfxFT2Font::GetFontEntry() {
return static_cast<FT2FontEntry*>(mFontEntry.get());
}
// Copied/modified from similar code in gfxMacPlatformFontList.mm:
// Complex scripts will not render correctly unless Graphite or OT
// layout tables are present.
// For OpenType, we also check that the GSUB table supports the relevant
// script tag, to avoid using things like Arial Unicode MS for Lao (it has
// the characters, but lacks OpenType support).
// TODO: consider whether we should move this to gfxFontEntry and do similar
// cmap-masking on all platforms to avoid using fonts that won't shape
// properly.
nsresult FT2FontEntry::ReadCMAP(FontInfoData* aFontInfoData) {
if (mCharacterMap || mShmemCharacterMap) {
return NS_OK;
}
RefPtr<gfxCharacterMap> charmap = new gfxCharacterMap();
nsresult rv = NS_ERROR_NOT_AVAILABLE;
uint32_t uvsOffset = 0;
gfxFontUtils::AutoHBBlob cmapBlob(GetFontTable(TTAG_cmap));
if (cmapBlob) {
unsigned int length;
const char* data = hb_blob_get_data(cmapBlob, &length);
rv = gfxFontUtils::ReadCMAP((const uint8_t*)data, length, *charmap,
uvsOffset);
}
mUVSOffset.exchange(uvsOffset);
if (NS_SUCCEEDED(rv) && !mIsDataUserFont && !HasGraphiteTables()) {
// For downloadable fonts, trust the author and don't
// try to munge the cmap based on script shaping support.
// We also assume a Graphite font knows what it's doing,
// and provides whatever shaping is needed for the
// characters it supports, so only check/clear the
// complex-script ranges for non-Graphite fonts
// for layout support, check for the presence of opentype layout tables
bool hasGSUB = HasFontTable(TRUETYPE_TAG('G', 'S', 'U', 'B'));
for (const ScriptRange* sr = gfxPlatformFontList::sComplexScriptRanges;
sr->rangeStart; sr++) {
// check to see if the cmap includes complex script codepoints
if (charmap->TestRange(sr->rangeStart, sr->rangeEnd)) {
// We check for GSUB here, as GPOS alone would not be ok.
if (hasGSUB && SupportsScriptInGSUB(sr->tags, sr->numTags)) {
continue;
}
charmap->ClearRange(sr->rangeStart, sr->rangeEnd);
}
}
}
#ifdef MOZ_WIDGET_ANDROID
// Hack for the SamsungDevanagari font, bug 1012365:
// pretend the font supports U+0972.
if (!charmap->test(0x0972) && charmap->test(0x0905) &&
charmap->test(0x0945)) {
charmap->set(0x0972);
}
#endif
bool setCharMap = true;
if (NS_SUCCEEDED(rv)) {
gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
fontlist::FontList* sharedFontList = pfl->SharedFontList();
if (!IsUserFont() && mShmemFace) {
mShmemFace->SetCharacterMap(sharedFontList, charmap); // async
if (TrySetShmemCharacterMap()) {
setCharMap = false;
}
} else {
charmap = pfl->FindCharMap(charmap);
}
mHasCmapTable = true;
} else {
// if error occurred, initialize to null cmap
charmap = new gfxCharacterMap();
mHasCmapTable = false;
}
if (setCharMap) {
if (mCharacterMap.compareExchange(nullptr, charmap.get())) {
// We forget rather than addref because we don't use the charmap below.
Unused << charmap.forget();
}
}
return rv;
}
hb_face_t* FT2FontEntry::CreateHBFace() const {
hb_face_t* result = nullptr;
if (mFilename[0] == '/') {
// An absolute path means a normal file in the filesystem, so we can use
// hb_blob_create_from_file to read it.
gfxFontUtils::AutoHBBlob fileBlob(
hb_blob_create_from_file(mFilename.get()));
if (hb_blob_get_length(fileBlob) > 0) {
result = hb_face_create(fileBlob, mFTFontIndex);
}
} else {
// A relative path means an omnijar resource, which we may need to
// decompress to a temporary buffer.
RefPtr<nsZipArchive> reader = Omnijar::GetReader(Omnijar::Type::GRE);
nsZipItem* item = reader->GetItem(mFilename.get());
MOZ_ASSERT(item, "failed to find zip entry");
if (item) {
// TODO(jfkthame):
// Check whether the item is compressed; if not, we could just get a
// pointer without needing to allocate a buffer and copy the data.
// (Currently this configuration isn't used for Gecko on Android.)
uint32_t length = item->RealSize();
uint8_t* buffer = static_cast<uint8_t*>(malloc(length));
if (buffer) {
nsZipCursor cursor(item, reader, buffer, length);
cursor.Copy(&length);
MOZ_ASSERT(length == item->RealSize(), "error reading font");
if (length == item->RealSize()) {
gfxFontUtils::AutoHBBlob blob(
hb_blob_create((const char*)buffer, length,
HB_MEMORY_MODE_READONLY, buffer, free));
result = hb_face_create(blob, mFTFontIndex);
}
}
}
}
return result;
}
bool FT2FontEntry::HasFontTable(uint32_t aTableTag) {
// If we already have a FreeType face, we can just use that.
if (mFTFace) {
RefPtr<SharedFTFace> face = GetFTFace();
return gfxFT2FontEntryBase::FaceHasTable(face, aTableTag);
}
{
// If we have a cached set of tables, query that.
AutoReadLock lock(mLock);
if (mAvailableTables.Count() > 0) {
return mAvailableTables.Contains(aTableTag);
}
}
// If we haven't created a FreeType face already, try to avoid that by
// reading the available table tags via harfbuzz and caching in a hashset.
AutoWriteLock lock(mLock);
if (!mFTFace && !mFilename.IsEmpty()) {
hb_face_t* face = CreateHBFace();
if (face) {
// Read table tags in batches; 32 should be enough for most fonts in a
// single operation.
const unsigned TAG_BUF_LENGTH = 32;
hb_tag_t tags[TAG_BUF_LENGTH];
unsigned int startOffset = 0;
unsigned int totalTables = 0;
do {
unsigned int count = TAG_BUF_LENGTH;
// Updates count to the number of table tags actually retrieved
totalTables = hb_face_get_table_tags(face, startOffset, &count, tags);
startOffset += count;
while (count-- > 0) {
mAvailableTables.Insert(tags[count]);
}
} while (startOffset < totalTables);
hb_face_destroy(face);
} else {
// Failed to create the HarfBuzz face! The font is probably broken.
// Put a dummy entry in mAvailableTables so that we don't bother
// re-trying here.
mAvailableTables.Insert(uint32_t(-1));
}
return mAvailableTables.Contains(aTableTag);
}
// Last resort: we'll have to create a (temporary) FreeType face to query
// for table presence.
RefPtr<SharedFTFace> face = GetFTFace();
return gfxFT2FontEntryBase::FaceHasTable(face, aTableTag);
}
nsresult FT2FontEntry::CopyFontTable(uint32_t aTableTag,
nsTArray<uint8_t>& aBuffer) {
RefPtr<SharedFTFace> face = GetFTFace();
return gfxFT2FontEntryBase::CopyFaceTable(face, aTableTag, aBuffer);
}
hb_blob_t* FT2FontEntry::GetFontTable(uint32_t aTableTag) {
if (FTUserFontData* userFontData = GetUserFontData()) {
// If there's a cairo font face, we may be able to return a blob
// that just wraps a range of the attached user font data
if (userFontData->FontData()) {
return gfxFontUtils::GetTableFromFontData(userFontData->FontData(),
aTableTag);
}
}
// If the FT_Face hasn't been instantiated, try to read table directly
// via harfbuzz API to avoid expensive FT_Face creation.
if (!mFTFace && !mFilename.IsEmpty()) {
hb_face_t* face = CreateHBFace();
if (face) {
hb_blob_t* result = hb_face_reference_table(face, aTableTag);
hb_face_destroy(face);
return result;
}
}
// Otherwise, use the default method (which in turn will call our
// implementation of CopyFontTable).
return gfxFontEntry::GetFontTable(aTableTag);
}
bool FT2FontEntry::HasVariations() {
switch (mHasVariations) {
case HasVariationsState::No:
return false;
case HasVariationsState::Yes:
return true;
case HasVariationsState::Uninitialized:
break;
}
SharedFTFace* face = mFTFace;
bool hasVariations =
face ? face->GetFace()->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS
: gfxPlatform::HasVariationFontSupport() &&
HasFontTable(TRUETYPE_TAG('f', 'v', 'a', 'r'));
mHasVariations =
hasVariations ? HasVariationsState::Yes : HasVariationsState::No;
return hasVariations;
}
void FT2FontEntry::GetVariationAxes(nsTArray<gfxFontVariationAxis>& aAxes) {
if (!HasVariations()) {
return;
}
if (FT_MM_Var* mmVar = GetMMVar()) {
gfxFT2Utils::GetVariationAxes(mmVar, aAxes);
}
}
void FT2FontEntry::GetVariationInstances(
nsTArray<gfxFontVariationInstance>& aInstances) {
if (!HasVariations()) {
return;
}
if (FT_MM_Var* mmVar = GetMMVar()) {
gfxFT2Utils::GetVariationInstances(this, mmVar, aInstances);
}
}
FT_MM_Var* FT2FontEntry::GetMMVar() {
if (mMMVarInitialized) {
return mMMVar;
}
AutoWriteLock lock(mLock);
RefPtr<SharedFTFace> face = GetFTFace(true);
if (!face) {
return nullptr;
}
if (FT_Err_Ok != FT_Get_MM_Var(face->GetFace(), &mMMVar)) {
mMMVar = nullptr;
}
mMMVarInitialized = true;
return mMMVar;
}
void FT2FontEntry::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const {
gfxFontEntry::AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
aSizes->mFontListSize +=
mFilename.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
}
void FT2FontEntry::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const {
aSizes->mFontListSize += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
/*
* FT2FontFamily
* A standard gfxFontFamily; just adds a method used to support sending
* the font list from chrome to content via IPC.
*/
void FT2FontFamily::AddFacesToFontList(nsTArray<FontListEntry>* aFontList) {
AutoReadLock lock(mLock);
for (int i = 0, n = mAvailableFonts.Length(); i < n; ++i) {
const FT2FontEntry* fe =
static_cast<const FT2FontEntry*>(mAvailableFonts[i].get());
if (!fe) {
continue;
}
aFontList->AppendElement(FontListEntry(
Name(), fe->Name(), fe->mFilename, fe->Weight().AsScalar(),
fe->Stretch().AsScalar(), fe->SlantStyle().AsScalar(), fe->mFTFontIndex,
Visibility()));
}
}
/*
* Startup cache support for the font list:
* We store the list of families and faces, with their style attributes and the
* corresponding font files, in the startup cache.
* This allows us to recreate the gfxFT2FontList collection of families and
* faces without instantiating Freetype faces for each font file (in order to
* find their attributes), leading to significantly quicker startup.
*/
#define CACHE_KEY "font.cached-list"
void gfxFT2FontList::CollectInitData(const FontListEntry& aFLE,
const nsCString& aPSName,
const nsCString& aFullName,
StandardFile aStdFile) {
nsAutoCString key(aFLE.familyName());
BuildKeyNameFromFontName(key);
mFaceInitData
.LookupOrInsertWith(
key,
[&] {
mFamilyInitData.AppendElement(
fontlist::Family::InitData{key, aFLE.familyName()});
return MakeUnique<nsTArray<fontlist::Face::InitData>>();
})
->AppendElement(fontlist::Face::InitData{
aFLE.filepath(), aFLE.index(), false,
WeightRange::FromScalar(aFLE.weightRange()),
StretchRange::FromScalar(aFLE.stretchRange()),
SlantStyleRange::FromScalar(aFLE.styleRange())});
nsAutoCString psname(aPSName), fullname(aFullName);
if (!psname.IsEmpty()) {
ToLowerCase(psname);
mLocalNameTable.InsertOrUpdate(
psname, fontlist::LocalFaceRec::InitData(key, aFLE.filepath()));
}
if (!fullname.IsEmpty()) {
ToLowerCase(fullname);
if (fullname != psname) {
mLocalNameTable.InsertOrUpdate(
fullname, fontlist::LocalFaceRec::InitData(key, aFLE.filepath()));
}
}
}
class FontNameCache {
public:
// Delimiters used in the cached font-list records we store in startupCache
static const char kFileSep = 0x1c;
static const char kGroupSep = 0x1d;
static const char kRecordSep = 0x1e;
static const char kFieldSep = 0x1f;
// Separator for font property ranges; we only look for this within a
// field that holds a serialized FontPropertyValue or Range, so there's no
// risk of conflicting with printable characters in font names.
// Note that this must be a character that will terminate strtof() parsing
// of a number.
static const char kRangeSep = ':';
// Creates the object but does NOT load the cached data from the startup
// cache; call Init() after creation to do that.
FontNameCache() : mMap(&mOps, sizeof(FNCMapEntry), 0), mWriteNeeded(false) {
// HACK ALERT: it's weird to assign |mOps| after we passed a pointer to
// it to |mMap|'s constructor. A more normal approach here would be to
// have a static |sOps| member. Unfortunately, this mysteriously but
// consistently makes Fennec start-up slower, so we take this
// unorthodox approach instead. It's safe because PLDHashTable's
// constructor doesn't dereference the pointer; it just makes a copy of
// it.
mOps = (PLDHashTableOps){StringHash, HashMatchEntry, MoveEntry,
PLDHashTable::ClearEntryStub, nullptr};
MOZ_ASSERT(XRE_IsParentProcess(),
"FontNameCache should only be used in chrome process");
mCache = mozilla::scache::StartupCache::GetSingleton();
}
~FontNameCache() { WriteCache(); }
size_t EntryCount() const { return mMap.EntryCount(); }
void DropStaleEntries() {
for (auto iter = mMap.ConstIter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<FNCMapEntry*>(iter.Get());
if (!entry->mFileExists) {
iter.Remove();
}
}
}
void WriteCache() {
if (!mWriteNeeded || !mCache) {
return;
}
LOG(("Writing FontNameCache:"));
nsAutoCString buf;
for (auto iter = mMap.ConstIter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<FNCMapEntry*>(iter.Get());
MOZ_ASSERT(entry->mFileExists);
buf.Append(entry->mFilename);
buf.Append(kGroupSep);
buf.Append(entry->mFaces);
buf.Append(kGroupSep);
buf.AppendInt(entry->mTimestamp);
buf.Append(kGroupSep);
buf.AppendInt(entry->mFilesize);
buf.Append(kFileSep);
}
LOG(("putting FontNameCache to " CACHE_KEY ", length %zu",
buf.Length() + 1));
mCache->PutBuffer(CACHE_KEY, UniqueFreePtr<char[]>(ToNewCString(buf)),
buf.Length() + 1);
mWriteNeeded = false;
}
// This may be called more than once (if we re-load the font list).
void Init() {
if (!mCache) {
return;
}
uint32_t size;
const char* cur;
if (NS_FAILED(mCache->GetBuffer(CACHE_KEY, &cur, &size))) {
LOG(("no cache of " CACHE_KEY));
return;
}
LOG(("got: %u bytes from the cache " CACHE_KEY, size));
mMap.Clear();
mWriteNeeded = false;
while (const char* fileEnd = strchr(cur, kFileSep)) {
// The cached record for one file is at [cur, fileEnd].
// Find end of field that starts at aStart, terminated by kGroupSep or
// end of record.
auto endOfField = [=](const char* aStart) -> const char* {
MOZ_ASSERT(aStart <= fileEnd);
const char* end = static_cast<const char*>(
memchr(aStart, kGroupSep, fileEnd - aStart));
if (end) {
return end;
}
return fileEnd;
};
// Advance aStart and aEnd to indicate the range of the next field and
// return true, or just return false if already at end of record.
auto nextField = [=](const char*& aStart, const char*& aEnd) -> bool {
if (aEnd < fileEnd) {
aStart = aEnd + 1;
aEnd = endOfField(aStart);
return true;
}
return false;
};
const char* end = endOfField(cur);
nsCString filename(cur, end - cur);
if (!nextField(cur, end)) {
break;
}
nsCString faceList(cur, end - cur);
if (!nextField(cur, end)) {
break;
}
uint32_t timestamp = strtoul(cur, nullptr, 10);
if (!nextField(cur, end)) {
break;
}
uint32_t filesize = strtoul(cur, nullptr, 10);
auto mapEntry =
static_cast<FNCMapEntry*>(mMap.Add(filename.get(), fallible));
if (mapEntry) {
mapEntry->mFilename.Assign(filename);
mapEntry->mTimestamp = timestamp;
mapEntry->mFilesize = filesize;
mapEntry->mFaces.Assign(faceList);
// entries from the startupcache are marked "non-existing"
// until we have confirmed that the file still exists
mapEntry->mFileExists = false;
}
cur = fileEnd + 1;
}
}
void GetInfoForFile(const nsCString& aFileName, nsCString& aFaceList,
uint32_t* aTimestamp, uint32_t* aFilesize) {
auto entry = static_cast<FNCMapEntry*>(mMap.Search(aFileName.get()));
if (entry) {
*aTimestamp = entry->mTimestamp;
*aFilesize = entry->mFilesize;
aFaceList.Assign(entry->mFaces);
// this entry does correspond to an existing file
// (although it might not be up-to-date, in which case
// it will get overwritten via CacheFileInfo)
entry->mFileExists = true;
}
}
void CacheFileInfo(const nsCString& aFileName, const nsCString& aFaceList,
uint32_t aTimestamp, uint32_t aFilesize) {
auto entry = static_cast<FNCMapEntry*>(mMap.Add(aFileName.get(), fallible));
if (entry) {
entry->mFilename.Assign(aFileName);
entry->mTimestamp = aTimestamp;
entry->mFilesize = aFilesize;
entry->mFaces.Assign(aFaceList);
entry->mFileExists = true;
}
mWriteNeeded = true;
}
private:
mozilla::scache::StartupCache* mCache;
PLDHashTable mMap;
bool mWriteNeeded;
PLDHashTableOps mOps;
struct FNCMapEntry : public PLDHashEntryHdr {
public:
nsCString mFilename;
uint32_t mTimestamp;
uint32_t mFilesize;
nsCString mFaces;
bool mFileExists;
};
static PLDHashNumber StringHash(const void* key) {
return HashString(reinterpret_cast<const char*>(key));
}
static bool HashMatchEntry(const PLDHashEntryHdr* aHdr, const void* key) {
const FNCMapEntry* entry = static_cast<const FNCMapEntry*>(aHdr);
return entry->mFilename.Equals(reinterpret_cast<const char*>(key));
}
static void MoveEntry(PLDHashTable* table, const PLDHashEntryHdr* aFrom,
PLDHashEntryHdr* aTo) {
FNCMapEntry* to = static_cast<FNCMapEntry*>(aTo);
const FNCMapEntry* from = static_cast<const FNCMapEntry*>(aFrom);
to->mFilename.Assign(from->mFilename);
to->mTimestamp = from->mTimestamp;
to->mFilesize = from->mFilesize;
to->mFaces.Assign(from->mFaces);
to->mFileExists = from->mFileExists;
}
};
/***************************************************************
*
* gfxFT2FontList
*
*/
// For Mobile, we use gfxFT2Fonts, and we build the font list by directly
// scanning the system's Fonts directory for OpenType and TrueType files.
#define JAR_LAST_MODIFED_TIME "jar-last-modified-time"
class WillShutdownObserver : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
explicit WillShutdownObserver(gfxFT2FontList* aFontList)
: mFontList(aFontList) {}
void Remove() {
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID);
}
mFontList = nullptr;
}
protected:
virtual ~WillShutdownObserver() = default;
gfxFT2FontList* mFontList;
};
NS_IMPL_ISUPPORTS(WillShutdownObserver, nsIObserver)
NS_IMETHODIMP
WillShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!nsCRT::strcmp(aTopic, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID)) {
mFontList->WillShutdown();
} else {
MOZ_ASSERT_UNREACHABLE("unexpected notification topic");
}
return NS_OK;
}
gfxFT2FontList::gfxFT2FontList() : mJarModifiedTime(0) {
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
mObserver = new WillShutdownObserver(this);
obs->AddObserver(mObserver, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID, false);
}
}
gfxFT2FontList::~gfxFT2FontList() {
AutoLock lock(mLock);
if (mObserver) {
mObserver->Remove();
}
}
bool gfxFT2FontList::AppendFacesFromCachedFaceList(CollectFunc aCollectFace,
const nsCString& aFileName,
const nsCString& aFaceList,
StandardFile aStdFile) {
const char* start = aFaceList.get();
int count = 0;
while (const char* recEnd = strchr(start, FontNameCache::kRecordSep)) {
auto endOfField = [=](const char* aStart) -> const char* {
MOZ_ASSERT(aStart <= recEnd);
const char* end = static_cast<const char*>(
memchr(aStart, FontNameCache::kFieldSep, recEnd - aStart));
if (end) {
return end;
}