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gfxFT2FontList.cpp
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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/FontPropertyTypes.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 "nsIInputStream.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 "nsServiceManagerUtils.h"
#include "nsIObserverService.h"
#include "nsTArray.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsISimpleEnumerator.h"
#include "nsIMemory.h"
#include "gfxFontConstants.h"
#include "mozilla/Preferences.h"
#include "mozilla/scache/StartupCache.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
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 cairo_user_data_key_t sFTUserFontDataKey;
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.
class AutoFTFace {
public:
explicit AutoFTFace(FT2FontEntry* aFontEntry)
: mFace(nullptr),
mFontDataBuf(nullptr),
mDataLength(0),
mOwnsFace(false) {
if (aFontEntry->mFTFace) {
mFace = aFontEntry->mFTFace;
return;
}
NS_ASSERTION(!aFontEntry->mFilename.IsEmpty(),
"can't use AutoFTFace 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.
if (aFontEntry->mFilename[0] != '/') {
RefPtr<nsZipArchive> reader = Omnijar::GetReader(Omnijar::Type::GRE);
nsZipItem* item = reader->GetItem(aFontEntry->mFilename.get());
NS_ASSERTION(item, "failed to find zip entry");
uint32_t bufSize = item->RealSize();
mFontDataBuf = static_cast<uint8_t*>(malloc(bufSize));
if (mFontDataBuf) {
nsZipCursor cursor(item, reader, mFontDataBuf, bufSize);
cursor.Copy(&bufSize);
NS_ASSERTION(bufSize == item->RealSize(), "error reading bundled font");
mDataLength = bufSize;
mFace = Factory::NewFTFaceFromData(nullptr, mFontDataBuf, bufSize,
aFontEntry->mFTFontIndex);
if (!mFace) {
NS_WARNING("failed to create freetype face");
}
}
} else {
mFace = Factory::NewFTFace(nullptr, aFontEntry->mFilename.get(),
aFontEntry->mFTFontIndex);
if (!mFace) {
NS_WARNING("failed to create freetype face");
}
}
if (FT_Err_Ok != FT_Select_Charmap(mFace, FT_ENCODING_UNICODE)) {
NS_WARNING("failed to select Unicode charmap");
}
mOwnsFace = true;
}
~AutoFTFace() {
if (mFace && mOwnsFace) {
Factory::ReleaseFTFace(mFace);
if (mFontDataBuf) {
free(mFontDataBuf);
}
}
}
operator FT_Face() { return mFace; }
// If we 'forget' the FT_Face (used when ownership is handed over to Cairo),
// we do -not- free the mFontDataBuf (if used); that also becomes the
// responsibility of the new owner of the face.
FT_Face forget() {
NS_ASSERTION(mOwnsFace, "can't forget() when we didn't own the face");
mOwnsFace = false;
return mFace;
}
const uint8_t* FontData() const { return mFontDataBuf; }
uint32_t DataLength() const { return mDataLength; }
private:
FT_Face mFace;
uint8_t* mFontDataBuf; // Uncompressed data (for fonts stored in a JAR),
// or null for fonts instantiated from a file.
// If non-null, this must survive as long as the
// FT_Face.
uint32_t mDataLength; // Size of mFontDataBuf, if present.
bool mOwnsFace;
};
/*
* 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.
*/
cairo_scaled_font_t* FT2FontEntry::CreateScaledFont(
const gfxFontStyle* aStyle) {
cairo_font_face_t* cairoFace = CairoFontFace(aStyle);
if (!cairoFace) {
return nullptr;
}
cairo_scaled_font_t* scaledFont = nullptr;
cairo_matrix_t sizeMatrix;
cairo_matrix_t identityMatrix;
// XXX deal with adjusted size
cairo_matrix_init_scale(&sizeMatrix, aStyle->size, aStyle->size);
cairo_matrix_init_identity(&identityMatrix);
cairo_font_options_t* fontOptions = cairo_font_options_create();
if (gfxPlatform::GetPlatform()->RequiresLinearZoom()) {
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_OFF);
}
scaledFont = cairo_scaled_font_create(cairoFace, &sizeMatrix, &identityMatrix,
fontOptions);
cairo_font_options_destroy(fontOptions);
NS_ASSERTION(cairo_scaled_font_status(scaledFont) == CAIRO_STATUS_SUCCESS,
"Failed to make scaled font");
return scaledFont;
}
FT2FontEntry::~FT2FontEntry() {
if (mMMVar) {
FT_Done_MM_Var(mFTFace->glyph->library, mMMVar);
}
// Do nothing for mFTFace here since FTFontDestroyFunc is called by cairo.
mFTFace = nullptr;
#ifndef ANDROID
if (mFontFace) {
cairo_font_face_destroy(mFontFace);
mFontFace = nullptr;
}
#endif
}
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;
}
static cairo_user_data_key_t sFTFaceKey;
gfxFont* FT2FontEntry::CreateFontInstance(const gfxFontStyle* aFontStyle) {
cairo_scaled_font_t* scaledFont = CreateScaledFont(aFontStyle);
if (!scaledFont) {
return nullptr;
}
RefPtr<UnscaledFontFreeType> unscaledFont(mUnscaledFont);
if (!unscaledFont) {
unscaledFont =
!mFilename.IsEmpty() && mFilename[0] == '/'
? new UnscaledFontFreeType(mFilename.BeginReading(), mFTFontIndex)
: new UnscaledFontFreeType(mFTFace);
mUnscaledFont = unscaledFont;
}
cairo_font_face_t* face = cairo_scaled_font_get_font_face(scaledFont);
FT_Face ftFace =
static_cast<FT_Face>(cairo_font_face_get_user_data(face, &sFTFaceKey));
gfxFont* font = new gfxFT2Font(unscaledFont, scaledFont,
ftFace ? ftFace : mFTFace, this, aFontStyle);
cairo_scaled_font_destroy(scaledFont);
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.
FT_Face face = Factory::NewFTFaceFromData(nullptr, aFontData, aLength, 0);
if (!face) {
free((void*)aFontData);
return nullptr;
}
if (FT_Err_Ok != FT_Select_Charmap(face, FT_ENCODING_UNICODE)) {
Factory::ReleaseFTFace(face);
free((void*)aFontData);
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(face, nullptr, 0, aFontName,
aFontData, aLength);
if (fe) {
fe->mStyleRange = aStyle;
fe->mWeightRange = aWeight;
fe->mStretchRange = aStretch;
fe->mIsDataUserFont = true;
}
return fe;
}
class FTUserFontData {
public:
FTUserFontData(FT_Face aFace, const uint8_t* aData, uint32_t aLength)
: mFace(aFace), mFontData(aData), mLength(aLength) {}
~FTUserFontData() {
Factory::ReleaseFTFace(mFace);
if (mFontData) {
free((void*)mFontData);
}
}
const uint8_t* FontData() const { return mFontData; }
uint32_t Length() const { return mLength; }
private:
FT_Face mFace;
const uint8_t* mFontData;
uint32_t mLength;
};
static void FTFontDestroyFunc(void* data) {
FTUserFontData* userFontData = static_cast<FTUserFontData*>(data);
delete userFontData;
}
/* 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;
}
// Helpers to extract font entry properties from an FT_Face
static bool FTFaceIsItalic(FT_Face aFace) {
return !!(aFace->style_flags & FT_STYLE_FLAG_ITALIC);
}
static FontWeight FTFaceGetWeight(FT_Face aFace) {
TT_OS2* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(aFace, ft_sfnt_os2));
uint16_t os2weight = 0;
if (os2 && os2->version != 0xffff) {
// Technically, only 100 to 900 are valid, but some fonts
// have this set wrong -- e.g. "Microsoft Logo Bold Italic" has
// it set to 6 instead of 600. We try to be nice and handle that
// as well.
if (os2->usWeightClass >= 100 && os2->usWeightClass <= 900) {
os2weight = os2->usWeightClass;
} else if (os2->usWeightClass >= 1 && os2->usWeightClass <= 9) {
os2weight = os2->usWeightClass * 100;
}
}
uint16_t result;
if (os2weight != 0) {
result = os2weight;
} else if (aFace->style_flags & FT_STYLE_FLAG_BOLD) {
result = 700;
} else {
result = 400;
}
NS_ASSERTION(result >= 100 && result <= 900, "Invalid weight in font!");
return FontWeight(int(result));
}
// Used to create the font entry for installed faces on the device,
// when iterating over the fonts directories.
// We use the FT_Face to retrieve the details needed for the font entry,
// but unless we have been passed font data (i.e. for a user font),
// we do *not* save a reference to it, nor create a cairo face,
// as we don't want to keep a freetype face for every installed font
// permanently in memory.
/* static */
FT2FontEntry* FT2FontEntry::CreateFontEntry(
FT_Face aFace, const char* aFilename, uint8_t aIndex,
const nsACString& aName, const uint8_t* aFontData, uint32_t aLength) {
FT2FontEntry* fe = new FT2FontEntry(aName);
fe->mStyleRange =
SlantStyleRange(FTFaceIsItalic(aFace) ? FontSlantStyle::Italic()
: FontSlantStyle::Normal());
fe->mWeightRange = WeightRange(FTFaceGetWeight(aFace));
fe->mFilename = aFilename;
fe->mFTFontIndex = aIndex;
if (aFontData) {
fe->mFTFace = aFace;
int flags = gfxPlatform::GetPlatform()->FontHintingEnabled()
? FT_LOAD_DEFAULT
: (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
fe->mFontFace =
cairo_ft_font_face_create_for_ft_face(aFace, flags, nullptr, 0);
FTUserFontData* userFontData =
new FTUserFontData(aFace, aFontData, aLength);
cairo_font_face_set_user_data(fe->mFontFace, &sFTUserFontDataKey,
userFontData, FTFontDestroyFunc);
}
return fe;
}
// construct font entry name for an installed font from names in the FT_Face,
// and then create our FT2FontEntry
static FT2FontEntry* CreateNamedFontEntry(FT_Face aFace, const char* aFilename,
uint8_t aIndex) {
if (!aFace->family_name) {
return nullptr;
}
nsAutoCString fontName(aFace->family_name);
if (aFace->style_name && strcmp("Regular", aFace->style_name)) {
fontName.Append(' ');
fontName.Append(aFace->style_name);
}
return FT2FontEntry::CreateFontEntry(aFace, aFilename, aIndex, fontName);
}
FT2FontEntry* gfxFT2Font::GetFontEntry() {
return static_cast<FT2FontEntry*>(mFontEntry.get());
}
cairo_font_face_t* FT2FontEntry::CairoFontFace(const gfxFontStyle* aStyle) {
// Create our basic (no-variations) mFontFace if not already present;
// this also ensures we have mFTFace available.
if (!mFontFace) {
AutoFTFace face(this);
if (!face) {
return nullptr;
}
int flags = gfxPlatform::GetPlatform()->FontHintingEnabled()
? FT_LOAD_DEFAULT
: (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
mFontFace = cairo_ft_font_face_create_for_ft_face(face, flags, nullptr, 0);
auto userFontData =
new FTUserFontData(face, face.FontData(), face.DataLength());
cairo_font_face_set_user_data(mFontFace, &sFTUserFontDataKey, userFontData,
FTFontDestroyFunc);
mFTFace = face.forget();
}
// If variations are present, we will not use our cached mFontFace
// but always create a new cairo_font_face_t because its FT_Face will
// have custom variation coordinates applied.
if ((!mVariationSettings.IsEmpty() ||
(aStyle && !aStyle->variationSettings.IsEmpty())) &&
(mFTFace->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) {
int flags = gfxPlatform::GetPlatform()->FontHintingEnabled()
? FT_LOAD_DEFAULT
: (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
// Resolve variations from entry (descriptor) and style (property)
AutoTArray<gfxFontVariation, 8> settings;
GetVariationsForStyle(settings, aStyle ? *aStyle : gfxFontStyle());
AutoTArray<FT_Fixed, 8> coords;
gfxFT2FontBase::SetupVarCoords(GetMMVar(), settings, &coords);
// Create a separate FT_Face because we need to apply custom
// variation settings to it.
FT_Face ftFace;
if (!mFilename.IsEmpty() && mFilename[0] == '/') {
ftFace = Factory::NewFTFace(nullptr, mFilename.get(), mFTFontIndex);
} else {
auto ufd = reinterpret_cast<FTUserFontData*>(
cairo_font_face_get_user_data(mFontFace, &sFTUserFontDataKey));
ftFace = Factory::NewFTFaceFromData(nullptr, ufd->FontData(),
ufd->Length(), mFTFontIndex);
}
// The variation coordinates will actually be applied to ftFace by
// gfxFT2FontBase::InitMetrics, so we don't need to do it here.
cairo_font_face_t* cairoFace = cairo_ft_font_face_create_for_ft_face(
ftFace, flags, coords.Elements(), coords.Length());
// Set up user data to properly release the FT_Face when the cairo face
// is deleted.
if (cairo_font_face_set_user_data(
cairoFace, &sFTFaceKey, ftFace,
(cairo_destroy_func_t)&Factory::ReleaseFTFace)) {
// set_user_data failed! discard, and fall back to default face
cairo_font_face_destroy(cairoFace);
FT_Done_Face(ftFace);
} else {
return cairoFace;
}
}
return mFontFace;
}
// 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) {
return NS_OK;
}
RefPtr<gfxCharacterMap> charmap = new gfxCharacterMap();
AutoTArray<uint8_t, 16384> buffer;
nsresult rv = CopyFontTable(TTAG_cmap, buffer);
if (NS_SUCCEEDED(rv)) {
rv = gfxFontUtils::ReadCMAP(buffer.Elements(), buffer.Length(), *charmap,
mUVSOffset);
}
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)) {
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
mHasCmapTable = NS_SUCCEEDED(rv);
if (mHasCmapTable) {
gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
mCharacterMap = pfl->FindCharMap(charmap);
} else {
// if error occurred, initialize to null cmap
mCharacterMap = new gfxCharacterMap();
}
return rv;
}
nsresult FT2FontEntry::CopyFontTable(uint32_t aTableTag,
nsTArray<uint8_t>& aBuffer) {
AutoFTFace face(this);
if (!face) {
return NS_ERROR_FAILURE;
}
FT_Error status;
FT_ULong len = 0;
status = FT_Load_Sfnt_Table(face, aTableTag, 0, nullptr, &len);
if (status != FT_Err_Ok || len == 0) {
return NS_ERROR_FAILURE;
}
if (!aBuffer.SetLength(len, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
uint8_t* buf = aBuffer.Elements();
status = FT_Load_Sfnt_Table(face, aTableTag, 0, buf, &len);
NS_ENSURE_TRUE(status == FT_Err_Ok, NS_ERROR_FAILURE);
return NS_OK;
}
hb_blob_t* FT2FontEntry::GetFontTable(uint32_t aTableTag) {
if (mFontFace) {
// 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
FTUserFontData* userFontData = static_cast<FTUserFontData*>(
cairo_font_face_get_user_data(mFontFace, &sFTUserFontDataKey));
if (userFontData && userFontData->FontData()) {
return gfxFontUtils::GetTableFromFontData(userFontData->FontData(),
aTableTag);
}
}
// otherwise, use the default method (which in turn will call our
// implementation of CopyFontTable)
return gfxFontEntry::GetFontTable(aTableTag);
}
bool FT2FontEntry::HasVariations() {
if (mHasVariationsInitialized) {
return mHasVariations;
}
mHasVariationsInitialized = true;
AutoFTFace face(this);
if (face) {
mHasVariations = FT_Face(face)->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS;
}
return mHasVariations;
}
void FT2FontEntry::GetVariationAxes(nsTArray<gfxFontVariationAxis>& aAxes) {
if (!HasVariations()) {
return;
}
FT_MM_Var* mmVar = GetMMVar();
if (!mmVar) {
return;
}
gfxFT2Utils::GetVariationAxes(mmVar, aAxes);
}
void FT2FontEntry::GetVariationInstances(
nsTArray<gfxFontVariationInstance>& aInstances) {
if (!HasVariations()) {
return;
}
FT_MM_Var* mmVar = GetMMVar();
if (!mmVar) {
return;
}
gfxFT2Utils::GetVariationInstances(this, mmVar, aInstances);
}
FT_MM_Var* FT2FontEntry::GetMMVar() {
if (mMMVarInitialized) {
return mMMVar;
}
mMMVarInitialized = true;
AutoFTFace face(this);
if (!face) {
return nullptr;
}
if (FT_Err_Ok != FT_Get_MM_Var(face, &mMMVar)) {
mMMVar = nullptr;
}
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(
InfallibleTArray<FontListEntry>* aFontList) {
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));
}
}
/*
* 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"
class FontNameCache {
public:
// 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() {
if (!mWriteNeeded || !mCache) {
return;
}
nsAutoCString buf;
for (auto iter = mMap.Iter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<FNCMapEntry*>(iter.Get());
if (!entry->mFileExists) {
// skip writing entries for files that are no longer present
continue;
}
buf.Append(entry->mFilename);
buf.Append(';');
buf.Append(entry->mFaces);
buf.Append(';');
buf.AppendInt(entry->mTimestamp);
buf.Append(';');
buf.AppendInt(entry->mFilesize);
buf.Append(';');
}
mCache->PutBuffer(CACHE_KEY, UniquePtr<char[]>(ToNewCString(buf)),
buf.Length() + 1);
}
// This may be called more than once (if we re-load the font list).
void Init() {
if (!mCache) {
return;
}
uint32_t size;
UniquePtr<char[]> buf;
if (NS_FAILED(mCache->GetBuffer(CACHE_KEY, &buf, &size))) {
return;
}
LOG(("got: %s from the cache", nsDependentCString(buf.get(), size).get()));
mMap.Clear();
mWriteNeeded = false;
const char* beginning = buf.get();
const char* end = strchr(beginning, ';');
while (end) {
nsCString filename(beginning, end - beginning);
beginning = end + 1;
if (!(end = strchr(beginning, ';'))) {
break;
}
nsCString faceList(beginning, end - beginning);
beginning = end + 1;
if (!(end = strchr(beginning, ';'))) {
break;
}
uint32_t timestamp = strtoul(beginning, nullptr, 10);
beginning = end + 1;
if (!(end = strchr(beginning, ';'))) {
break;
}
uint32_t filesize = strtoul(beginning, 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;
}
beginning = end + 1;
end = strchr(beginning, ';');
}
}
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;
typedef struct : public PLDHashEntryHdr {
public:
nsCString mFilename;
uint32_t mTimestamp;
uint32_t mFilesize;
nsCString mFaces;
bool mFileExists;
} FNCMapEntry;
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() {}
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() {
if (mObserver) {
mObserver->Remove();
}
}
void gfxFT2FontList::AppendFacesFromCachedFaceList(const nsCString& aFileName,
const nsCString& aFaceList,
StandardFile aStdFile) {
const char* beginning = aFaceList.get();
const char* end = strchr(beginning, ',');
while (end) {
nsAutoCString familyName(beginning, end - beginning);
ToLowerCase(familyName);
beginning = end + 1;
if (!(end = strchr(beginning, ','))) {
break;
}
nsAutoCString faceName(beginning, end - beginning);
beginning = end + 1;
if (!(end = strchr(beginning, ','))) {
break;
}
uint32_t index = strtoul(beginning, nullptr, 10);
beginning = end + 1;
if (!(end = strchr(beginning, ','))) {
break;
}
nsAutoCString minStyle(beginning, end - beginning);
nsAutoCString maxStyle(minStyle);
int32_t colon = minStyle.FindChar(':');
if (colon > 0) {
maxStyle.Assign(minStyle.BeginReading() + colon + 1);
minStyle.Truncate(colon);
}
beginning = end + 1;
if (!(end = strchr(beginning, ','))) {
break;
}
char* limit;
float minWeight = strtof(beginning, &limit);
float maxWeight;
if (*limit == ':' && limit + 1 < end) {
maxWeight = strtof(limit + 1, nullptr);
} else {
maxWeight = minWeight;
}
beginning = end + 1;
if (!(end = strchr(beginning, ','))) {
break;
}
float minStretch = strtof(beginning, &limit);
float maxStretch;
if (*limit == ':' && limit + 1 < end) {
maxStretch = strtof(limit + 1, nullptr);
} else {
maxStretch = minStretch;
}
FontListEntry fle(
familyName, faceName, aFileName,
WeightRange(FontWeight(minWeight), FontWeight(maxWeight)).AsScalar(),
StretchRange(FontStretch(minStretch), FontStretch(maxStretch))
.AsScalar(),
SlantStyleRange(FontSlantStyle::FromString(minStyle.get()),
FontSlantStyle::FromString(maxStyle.get()))
.AsScalar(),
index);
AppendFaceFromFontListEntry(fle, aStdFile);
beginning = end + 1;
end = strchr(beginning, ',');
}
}
static void AppendToFaceList(nsCString& aFaceList, nsACString& aFamilyName,
FT2FontEntry* aFontEntry) {
aFaceList.Append(aFamilyName);
aFaceList.Append(',');
aFaceList.Append(aFontEntry->Name());
aFaceList.Append(',');
aFaceList.AppendInt(aFontEntry->mFTFontIndex);
aFaceList.Append(',');
// Note that ToString() appends to the destination string without
// replacing existing contents (see FontPropertyTypes.h)
aFontEntry->SlantStyle().Min().ToString(aFaceList);
aFaceList.Append(':');
aFontEntry->SlantStyle().Max().ToString(aFaceList);
aFaceList.Append(',');
aFaceList.AppendFloat(aFontEntry->Weight().Min().ToFloat());