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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 "gfxFontEntry.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Logging.h"
#include "gfxTextRun.h"
#include "gfxPlatform.h"
#include "nsGkAtoms.h"
#include "gfxTypes.h"
#include "gfxContext.h"
#include "gfxFontConstants.h"
#include "gfxGraphiteShaper.h"
#include "gfxHarfBuzzShaper.h"
#include "gfxUserFontSet.h"
#include "gfxPlatformFontList.h"
#include "nsUnicodeProperties.h"
#include "nsMathUtils.h"
#include "nsBidiUtils.h"
#include "nsStyleConsts.h"
#include "mozilla/AppUnits.h"
#include "mozilla/FloatingPoint.h"
#ifdef MOZ_WASM_SANDBOXING_GRAPHITE
# include "mozilla/ipc/LibrarySandboxPreload.h"
#endif
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/Telemetry.h"
#include "gfxSVGGlyphs.h"
#include "gfx2DGlue.h"
#include "harfbuzz/hb.h"
#include "harfbuzz/hb-ot.h"
#include "graphite2/Font.h"
#include "ThebesRLBox.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::unicode;
nsrefcnt gfxCharacterMap::NotifyMaybeReleased() {
auto* pfl = gfxPlatformFontList::PlatformFontList();
pfl->Lock();
// Something may have pulled our raw pointer out of gfxPlatformFontList before
// we were able to complete the release.
if (mRefCnt > 0) {
pfl->Unlock();
return mRefCnt;
}
if (mShared) {
pfl->RemoveCmap(this);
}
pfl->Unlock();
delete this;
return 0;
}
gfxFontEntry::gfxFontEntry(const nsACString& aName, bool aIsStandardFace)
: mName(aName),
mLock("gfxFontEntry lock"),
mFeatureInfoLock("gfxFontEntry featureInfo mutex"),
mFixedPitch(false),
mIsBadUnderlineFont(false),
mIsUserFontContainer(false),
mIsDataUserFont(false),
mIsLocalUserFont(false),
mStandardFace(aIsStandardFace),
mIgnoreGDEF(false),
mIgnoreGSUB(false),
mSkipDefaultFeatureSpaceCheck(false),
mSVGInitialized(false),
mHasCmapTable(false),
mGrFaceInitialized(false),
mCheckedForColorGlyph(false),
mCheckedForVariationAxes(false),
mSpaceGlyphIsInvisible(LazyFlag::Uninitialized),
mHasGraphiteTables(LazyFlag::Uninitialized),
mHasGraphiteSpaceContextuals(LazyFlag::Uninitialized),
mHasColorBitmapTable(LazyFlag::Uninitialized),
mHasSpaceFeatures(SpaceFeatures::Uninitialized) {
mTrakTable.exchange(kTrakTableUninitialized);
memset(&mDefaultSubSpaceFeatures, 0, sizeof(mDefaultSubSpaceFeatures));
memset(&mNonDefaultSubSpaceFeatures, 0, sizeof(mNonDefaultSubSpaceFeatures));
}
gfxFontEntry::~gfxFontEntry() {
// Should not be dropped by stylo
MOZ_ASSERT(!gfxFontUtils::IsInServoTraversal());
hb_blob_destroy(mCOLR.exchange(nullptr));
hb_blob_destroy(mCPAL.exchange(nullptr));
if (TrakTableInitialized()) {
// Only if it was initialized, so that we don't try to call hb_blob_destroy
// on the kTrakTableUninitialized flag value!
hb_blob_destroy(mTrakTable.exchange(nullptr));
}
// For downloaded fonts, we need to tell the user font cache that this
// entry is being deleted.
if (mIsDataUserFont) {
gfxUserFontSet::UserFontCache::ForgetFont(this);
}
if (mFeatureInputs) {
for (auto iter = mFeatureInputs->Iter(); !iter.Done(); iter.Next()) {
hb_set_t*& set = iter.Data();
hb_set_destroy(set);
}
}
delete mFontTableCache.exchange(nullptr);
delete mSVGGlyphs.exchange(nullptr);
delete[] mUVSData.exchange(nullptr);
gfxCharacterMap* cmap = mCharacterMap.exchange(nullptr);
NS_IF_RELEASE(cmap);
// By the time the entry is destroyed, all font instances that were
// using it should already have been deleted, and so the HB and/or Gr
// face objects should have been released.
MOZ_ASSERT(!mHBFace);
MOZ_ASSERT(!mGrFaceInitialized);
}
// Only used during initialization, before any other thread has a chance to see
// the entry, so locking not required.
void gfxFontEntry::InitializeFrom(fontlist::Face* aFace,
const fontlist::Family* aFamily) {
mStyleRange = aFace->mStyle;
mWeightRange = aFace->mWeight;
mStretchRange = aFace->mStretch;
mFixedPitch = aFace->mFixedPitch;
mIsBadUnderlineFont = aFamily->IsBadUnderlineFamily();
mShmemFace = aFace;
auto* list = gfxPlatformFontList::PlatformFontList()->SharedFontList();
mFamilyName = aFamily->DisplayName().AsString(list);
mHasCmapTable = TrySetShmemCharacterMap();
}
bool gfxFontEntry::TrySetShmemCharacterMap() {
MOZ_ASSERT(mShmemFace);
auto list = gfxPlatformFontList::PlatformFontList()->SharedFontList();
const auto* shmemCmap =
static_cast<const SharedBitSet*>(mShmemFace->mCharacterMap.ToPtr(list));
mShmemCharacterMap.exchange(shmemCmap);
return shmemCmap != nullptr;
}
bool gfxFontEntry::TestCharacterMap(uint32_t aCh) {
if (!mCharacterMap && !mShmemCharacterMap) {
ReadCMAP();
MOZ_ASSERT(mCharacterMap || mShmemCharacterMap,
"failed to initialize character map");
}
return mShmemCharacterMap ? GetShmemCharacterMap()->test(aCh)
: GetCharacterMap()->test(aCh);
}
void gfxFontEntry::EnsureUVSMapInitialized() {
// mUVSOffset will not be initialized
// until cmap is initialized.
if (!mCharacterMap && !mShmemCharacterMap) {
ReadCMAP();
NS_ASSERTION(mCharacterMap || mShmemCharacterMap,
"failed to initialize character map");
}
if (!mUVSOffset) {
return;
}
if (!mUVSData) {
nsresult rv = NS_ERROR_NOT_AVAILABLE;
const uint32_t kCmapTag = TRUETYPE_TAG('c', 'm', 'a', 'p');
AutoTable cmapTable(this, kCmapTag);
if (cmapTable) {
const uint8_t* uvsData = nullptr;
unsigned int cmapLen;
const char* cmapData = hb_blob_get_data(cmapTable, &cmapLen);
rv = gfxFontUtils::ReadCMAPTableFormat14(
(const uint8_t*)cmapData + mUVSOffset, cmapLen - mUVSOffset, uvsData);
if (NS_SUCCEEDED(rv)) {
if (!mUVSData.compareExchange(nullptr, uvsData)) {
delete uvsData;
}
}
}
if (NS_FAILED(rv)) {
mUVSOffset = 0; // don't try to read the table again
}
}
}
uint16_t gfxFontEntry::GetUVSGlyph(uint32_t aCh, uint32_t aVS) {
EnsureUVSMapInitialized();
if (const auto* uvsData = GetUVSData()) {
return gfxFontUtils::MapUVSToGlyphFormat14(uvsData, aCh, aVS);
}
return 0;
}
bool gfxFontEntry::SupportsScriptInGSUB(const hb_tag_t* aScriptTags,
uint32_t aNumTags) {
auto face(GetHBFace());
unsigned int index;
hb_tag_t chosenScript;
bool found = hb_ot_layout_table_select_script(
face, TRUETYPE_TAG('G', 'S', 'U', 'B'), aNumTags, aScriptTags, &index,
&chosenScript);
return found && chosenScript != TRUETYPE_TAG('D', 'F', 'L', 'T');
}
nsresult gfxFontEntry::ReadCMAP(FontInfoData* aFontInfoData) {
MOZ_ASSERT(false, "using default no-op implementation of ReadCMAP");
RefPtr<gfxCharacterMap> cmap = new gfxCharacterMap();
if (mCharacterMap.compareExchange(nullptr, cmap.get())) {
Unused << cmap.forget(); // mCharacterMap now owns the reference
}
return NS_OK;
}
nsCString gfxFontEntry::RealFaceName() {
AutoTable nameTable(this, TRUETYPE_TAG('n', 'a', 'm', 'e'));
if (nameTable) {
nsAutoCString name;
nsresult rv = gfxFontUtils::GetFullNameFromTable(nameTable, name);
if (NS_SUCCEEDED(rv)) {
return std::move(name);
}
}
return Name();
}
already_AddRefed<gfxFont> gfxFontEntry::FindOrMakeFont(
const gfxFontStyle* aStyle, gfxCharacterMap* aUnicodeRangeMap) {
RefPtr<gfxFont> font =
gfxFontCache::GetCache()->Lookup(this, aStyle, aUnicodeRangeMap);
if (font) {
return font.forget();
}
font = CreateFontInstance(aStyle);
if (!font || !font->Valid()) {
return nullptr;
}
font->SetUnicodeRangeMap(aUnicodeRangeMap);
return gfxFontCache::GetCache()->MaybeInsert(std::move(font));
}
uint16_t gfxFontEntry::UnitsPerEm() {
if (!mUnitsPerEm) {
AutoTable headTable(this, TRUETYPE_TAG('h', 'e', 'a', 'd'));
if (headTable) {
uint32_t len;
const HeadTable* head =
reinterpret_cast<const HeadTable*>(hb_blob_get_data(headTable, &len));
if (len >= sizeof(HeadTable)) {
mUnitsPerEm = head->unitsPerEm;
}
}
// if we didn't find a usable 'head' table, or if the value was
// outside the valid range, record it as invalid
if (mUnitsPerEm < kMinUPEM || mUnitsPerEm > kMaxUPEM) {
mUnitsPerEm = kInvalidUPEM;
}
}
return mUnitsPerEm;
}
bool gfxFontEntry::HasSVGGlyph(uint32_t aGlyphId) {
NS_ASSERTION(mSVGInitialized,
"SVG data has not yet been loaded. TryGetSVGData() first.");
return GetSVGGlyphs()->HasSVGGlyph(aGlyphId);
}
bool gfxFontEntry::GetSVGGlyphExtents(DrawTarget* aDrawTarget,
uint32_t aGlyphId, gfxFloat aSize,
gfxRect* aResult) {
MOZ_ASSERT(mSVGInitialized,
"SVG data has not yet been loaded. TryGetSVGData() first.");
MOZ_ASSERT(mUnitsPerEm >= kMinUPEM && mUnitsPerEm <= kMaxUPEM,
"font has invalid unitsPerEm");
gfxMatrix svgToApp(aSize / mUnitsPerEm, 0, 0, aSize / mUnitsPerEm, 0, 0);
return GetSVGGlyphs()->GetGlyphExtents(aGlyphId, svgToApp, aResult);
}
void gfxFontEntry::RenderSVGGlyph(gfxContext* aContext, uint32_t aGlyphId,
SVGContextPaint* aContextPaint) {
NS_ASSERTION(mSVGInitialized,
"SVG data has not yet been loaded. TryGetSVGData() first.");
GetSVGGlyphs()->RenderGlyph(aContext, aGlyphId, aContextPaint);
}
bool gfxFontEntry::TryGetSVGData(const gfxFont* aFont) {
if (!gfxPlatform::GetPlatform()->OpenTypeSVGEnabled()) {
return false;
}
// We don't support SVG-in-OT glyphs in offscreen-canvas worker threads.
if (!NS_IsMainThread()) {
return false;
}
if (!mSVGInitialized) {
// If UnitsPerEm is not known/valid, we can't use SVG glyphs
if (UnitsPerEm() == kInvalidUPEM) {
mSVGInitialized = true;
return false;
}
// We don't use AutoTable here because we'll pass ownership of this
// blob to the gfxSVGGlyphs, once we've confirmed the table exists
hb_blob_t* svgTable = GetFontTable(TRUETYPE_TAG('S', 'V', 'G', ' '));
if (!svgTable) {
mSVGInitialized = true;
return false;
}
// gfxSVGGlyphs will hb_blob_destroy() the table when it is finished
// with it.
auto* svgGlyphs = new gfxSVGGlyphs(svgTable, this);
if (!mSVGGlyphs.compareExchange(nullptr, svgGlyphs)) {
delete svgGlyphs;
}
mSVGInitialized = true;
}
if (GetSVGGlyphs()) {
AutoWriteLock lock(mLock);
if (!mFontsUsingSVGGlyphs.Contains(aFont)) {
mFontsUsingSVGGlyphs.AppendElement(aFont);
}
}
return !!GetSVGGlyphs();
}
void gfxFontEntry::NotifyFontDestroyed(gfxFont* aFont) {
AutoWriteLock lock(mLock);
mFontsUsingSVGGlyphs.RemoveElement(aFont);
}
void gfxFontEntry::NotifyGlyphsChanged() {
AutoReadLock lock(mLock);
for (uint32_t i = 0, count = mFontsUsingSVGGlyphs.Length(); i < count; ++i) {
const gfxFont* font = mFontsUsingSVGGlyphs[i];
font->NotifyGlyphsChanged();
}
}
bool gfxFontEntry::TryGetColorGlyphs() {
if (mCheckedForColorGlyph) {
return mCOLR && mCPAL;
}
auto* colr = GetFontTable(TRUETYPE_TAG('C', 'O', 'L', 'R'));
auto* cpal = colr ? GetFontTable(TRUETYPE_TAG('C', 'P', 'A', 'L')) : nullptr;
if (colr && cpal && gfx::COLRFonts::ValidateColorGlyphs(colr, cpal)) {
if (!mCOLR.compareExchange(nullptr, colr)) {
hb_blob_destroy(colr);
}
if (!mCPAL.compareExchange(nullptr, cpal)) {
hb_blob_destroy(cpal);
}
} else {
hb_blob_destroy(colr);
hb_blob_destroy(cpal);
}
mCheckedForColorGlyph = true;
return mCOLR && mCPAL;
}
/**
* FontTableBlobData
*
* See FontTableHashEntry for the general strategy.
*/
class gfxFontEntry::FontTableBlobData {
public:
explicit FontTableBlobData(nsTArray<uint8_t>&& aBuffer)
: mTableData(std::move(aBuffer)), mHashtable(nullptr), mHashKey(0) {
MOZ_COUNT_CTOR(FontTableBlobData);
}
~FontTableBlobData() {
MOZ_COUNT_DTOR(FontTableBlobData);
if (mHashtable && mHashKey) {
mHashtable->RemoveEntry(mHashKey);
}
}
// Useful for creating blobs
const char* GetTable() const {
return reinterpret_cast<const char*>(mTableData.Elements());
}
uint32_t GetTableLength() const { return mTableData.Length(); }
// Tell this FontTableBlobData to remove the HashEntry when this is
// destroyed.
void ManageHashEntry(nsTHashtable<FontTableHashEntry>* aHashtable,
uint32_t aHashKey) {
mHashtable = aHashtable;
mHashKey = aHashKey;
}
// Disconnect from the HashEntry (because the blob has already been
// removed from the hashtable).
void ForgetHashEntry() {
mHashtable = nullptr;
mHashKey = 0;
}
size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
return mTableData.ShallowSizeOfExcludingThis(aMallocSizeOf);
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
// The font table data block
nsTArray<uint8_t> mTableData;
// The blob destroy function needs to know the owning hashtable
// and the hashtable key, so that it can remove the entry.
nsTHashtable<FontTableHashEntry>* mHashtable;
uint32_t mHashKey;
// not implemented
FontTableBlobData(const FontTableBlobData&);
};
hb_blob_t* gfxFontEntry::FontTableHashEntry::ShareTableAndGetBlob(
nsTArray<uint8_t>&& aTable, nsTHashtable<FontTableHashEntry>* aHashtable) {
Clear();
// adopts elements of aTable
mSharedBlobData = new FontTableBlobData(std::move(aTable));
mBlob = hb_blob_create(
mSharedBlobData->GetTable(), mSharedBlobData->GetTableLength(),
HB_MEMORY_MODE_READONLY, mSharedBlobData, DeleteFontTableBlobData);
if (mBlob == hb_blob_get_empty()) {
// The FontTableBlobData was destroyed during hb_blob_create().
// The (empty) blob is still be held in the hashtable with a strong
// reference.
return hb_blob_reference(mBlob);
}
// Tell the FontTableBlobData to remove this hash entry when destroyed.
// The hashtable does not keep a strong reference.
mSharedBlobData->ManageHashEntry(aHashtable, GetKey());
return mBlob;
}
void gfxFontEntry::FontTableHashEntry::Clear() {
// If the FontTableBlobData is managing the hash entry, then the blob is
// not owned by this HashEntry; otherwise there is strong reference to the
// blob that must be removed.
if (mSharedBlobData) {
mSharedBlobData->ForgetHashEntry();
mSharedBlobData = nullptr;
} else {
hb_blob_destroy(mBlob);
}
mBlob = nullptr;
}
// a hb_destroy_func for hb_blob_create
/* static */
void gfxFontEntry::FontTableHashEntry::DeleteFontTableBlobData(
void* aBlobData) {
delete static_cast<FontTableBlobData*>(aBlobData);
}
hb_blob_t* gfxFontEntry::FontTableHashEntry::GetBlob() const {
return hb_blob_reference(mBlob);
}
bool gfxFontEntry::GetExistingFontTable(uint32_t aTag, hb_blob_t** aBlob) {
// Accessing the mFontTableCache pointer is atomic, so we don't need to take
// a write lock even if we're initializing it here...
MOZ_PUSH_IGNORE_THREAD_SAFETY
if (MOZ_UNLIKELY(!mFontTableCache)) {
// We do this here rather than on fontEntry construction
// because not all shapers will access the table cache at all.
//
// We're not holding a write lock, so make sure to atomically update
// the cache pointer.
auto* newCache = new FontTableCache(8);
if (MOZ_UNLIKELY(!mFontTableCache.compareExchange(nullptr, newCache))) {
delete newCache;
}
}
FontTableCache* cache = GetFontTableCache();
MOZ_POP_THREAD_SAFETY
// ...but we do need a lock to read the actual hashtable contents.
AutoReadLock lock(mLock);
FontTableHashEntry* entry = cache->GetEntry(aTag);
if (!entry) {
return false;
}
*aBlob = entry->GetBlob();
return true;
}
hb_blob_t* gfxFontEntry::ShareFontTableAndGetBlob(uint32_t aTag,
nsTArray<uint8_t>* aBuffer) {
MOZ_PUSH_IGNORE_THREAD_SAFETY
if (MOZ_UNLIKELY(!mFontTableCache)) {
auto* newCache = new FontTableCache(8);
if (MOZ_UNLIKELY(!mFontTableCache.compareExchange(nullptr, newCache))) {
delete newCache;
}
}
FontTableCache* cache = GetFontTableCache();
MOZ_POP_THREAD_SAFETY
AutoWriteLock lock(mLock);
FontTableHashEntry* entry = cache->PutEntry(aTag);
if (MOZ_UNLIKELY(!entry)) { // OOM
return nullptr;
}
if (!aBuffer) {
// ensure the entry is null
entry->Clear();
return nullptr;
}
return entry->ShareTableAndGetBlob(std::move(*aBuffer), cache);
}
already_AddRefed<gfxCharacterMap> gfxFontEntry::GetCMAPFromFontInfo(
FontInfoData* aFontInfoData, uint32_t& aUVSOffset) {
if (!aFontInfoData || !aFontInfoData->mLoadCmaps) {
return nullptr;
}
return aFontInfoData->GetCMAP(mName, aUVSOffset);
}
hb_blob_t* gfxFontEntry::GetFontTable(uint32_t aTag) {
hb_blob_t* blob;
if (GetExistingFontTable(aTag, &blob)) {
return blob;
}
nsTArray<uint8_t> buffer;
bool haveTable = NS_SUCCEEDED(CopyFontTable(aTag, buffer));
return ShareFontTableAndGetBlob(aTag, haveTable ? &buffer : nullptr);
}
// callback for HarfBuzz to get a font table (in hb_blob_t form)
// from the font entry (passed as aUserData)
/*static*/
hb_blob_t* gfxFontEntry::HBGetTable(hb_face_t* face, uint32_t aTag,
void* aUserData) {
gfxFontEntry* fontEntry = static_cast<gfxFontEntry*>(aUserData);
// bug 589682 - ignore the GDEF table in buggy fonts (applies to
// Italic and BoldItalic faces of Times New Roman)
if (aTag == TRUETYPE_TAG('G', 'D', 'E', 'F') && fontEntry->IgnoreGDEF()) {
return nullptr;
}
// bug 721719 - ignore the GSUB table in buggy fonts (applies to Roboto,
// at least on some Android ICS devices; set in gfxFT2FontList.cpp)
if (aTag == TRUETYPE_TAG('G', 'S', 'U', 'B') && fontEntry->IgnoreGSUB()) {
return nullptr;
}
return fontEntry->GetFontTable(aTag);
}
struct gfxFontEntry::GrSandboxData {
rlbox_sandbox_gr sandbox;
sandbox_callback_gr<const void* (*)(const void*, unsigned int, unsigned int*)>
grGetTableCallback;
sandbox_callback_gr<void (*)(const void*, const void*)>
grReleaseTableCallback;
// Text Shapers register a callback to get glyph advances
sandbox_callback_gr<float (*)(const void*, uint16_t)>
grGetGlyphAdvanceCallback;
GrSandboxData() {
sandbox.create_sandbox();
grGetTableCallback = sandbox.register_callback(GrGetTable);
grReleaseTableCallback = sandbox.register_callback(GrReleaseTable);
grGetGlyphAdvanceCallback =
sandbox.register_callback(gfxGraphiteShaper::GrGetAdvance);
}
~GrSandboxData() {
grGetTableCallback.unregister();
grReleaseTableCallback.unregister();
grGetGlyphAdvanceCallback.unregister();
sandbox.destroy_sandbox();
}
};
static thread_local gfxFontEntry* tl_grGetFontTableCallbackData = nullptr;
/*static*/
tainted_opaque_gr<const void*> gfxFontEntry::GrGetTable(
rlbox_sandbox_gr& sandbox,
tainted_opaque_gr<const void*> /* aAppFaceHandle */,
tainted_opaque_gr<unsigned int> aName,
tainted_opaque_gr<unsigned int*> aLen) {
gfxFontEntry* fontEntry = tl_grGetFontTableCallbackData;
tainted_gr<unsigned int*> t_aLen = rlbox::from_opaque(aLen);
*t_aLen = 0;
tainted_gr<const void*> ret = nullptr;
if (fontEntry) {
unsigned int fontTableKey =
rlbox::from_opaque(aName).unverified_safe_because(
"This is only being used to index into a hashmap, which is robust "
"for any value. No checks needed.");
gfxFontUtils::AutoHBBlob blob(fontEntry->GetFontTable(fontTableKey));
if (blob) {
unsigned int blobLength;
const void* tableData = hb_blob_get_data(blob, &blobLength);
// tableData is read-only data shared with the sandbox.
// Making a copy in sandbox memory
tainted_gr<void*> t_tableData = rlbox::sandbox_reinterpret_cast<void*>(
sandbox.malloc_in_sandbox<char>(blobLength));
if (t_tableData) {
rlbox::memcpy(sandbox, t_tableData, tableData, blobLength);
*t_aLen = blobLength;
ret = rlbox::sandbox_const_cast<const void*>(t_tableData);
}
}
}
return ret.to_opaque();
}
/*static*/
void gfxFontEntry::GrReleaseTable(
rlbox_sandbox_gr& sandbox,
tainted_opaque_gr<const void*> /* aAppFaceHandle */,
tainted_opaque_gr<const void*> aTableBuffer) {
sandbox.free_in_sandbox(rlbox::from_opaque(aTableBuffer));
}
rlbox_sandbox_gr* gfxFontEntry::GetGrSandbox() {
AutoReadLock lock(mLock);
MOZ_ASSERT(mSandboxData != nullptr);
return &mSandboxData->sandbox;
}
sandbox_callback_gr<float (*)(const void*, uint16_t)>*
gfxFontEntry::GetGrSandboxAdvanceCallbackHandle() {
AutoReadLock lock(mLock);
MOZ_ASSERT(mSandboxData != nullptr);
return &mSandboxData->grGetGlyphAdvanceCallback;
}
tainted_opaque_gr<gr_face*> gfxFontEntry::GetGrFace() {
if (!mGrFaceInitialized) {
// When possible, the below code will use WASM as a sandboxing mechanism.
// At this time the wasm sandbox does not support threads.
// If Thebes is updated to make callst to the sandbox on multiple threaads,
// we need to make sure the underlying sandbox supports threading.
MOZ_ASSERT(NS_IsMainThread());
mSandboxData = new GrSandboxData();
auto p_faceOps = mSandboxData->sandbox.malloc_in_sandbox<gr_face_ops>();
if (!p_faceOps) {
MOZ_CRASH("Graphite sandbox memory allocation failed");
}
p_faceOps->size = sizeof(*p_faceOps);
p_faceOps->get_table = mSandboxData->grGetTableCallback;
p_faceOps->release_table = mSandboxData->grReleaseTableCallback;
tl_grGetFontTableCallbackData = this;
auto face = sandbox_invoke(
mSandboxData->sandbox, gr_make_face_with_ops,
// For security, we do not pass the callback data to this arg, and use
// a TLS var instead. However, gr_make_face_with_ops expects this to
// be a non null ptr. Therefore, we should pass some dummy non null
// pointer which will be passed to callbacks, but never used. Let's just
// pass p_faceOps again, as this is a non-null tainted pointer.
p_faceOps /* appFaceHandle */, p_faceOps, gr_face_default);
tl_grGetFontTableCallbackData = nullptr;
mGrFace = face.to_opaque();
mGrFaceInitialized = true;
mSandboxData->sandbox.free_in_sandbox(p_faceOps);
}
++mGrFaceRefCnt;
return mGrFace;
}
void gfxFontEntry::ReleaseGrFace(tainted_opaque_gr<gr_face*> aFace) {
MOZ_ASSERT(
(rlbox::from_opaque(aFace) == rlbox::from_opaque(mGrFace))
.unverified_safe_because(
"This is safe as the only thing we are doing is comparing "
"addresses of two tainted pointers. Furthermore this is used "
"merely as a debugging aid in the debug builds. This function is "
"called only from the trusted Firefox code rather than the "
"untrusted libGraphite.")); // sanity-check
MOZ_ASSERT(mGrFaceRefCnt > 0);
if (--mGrFaceRefCnt == 0) {
auto t_mGrFace = rlbox::from_opaque(mGrFace);
tl_grGetFontTableCallbackData = this;
sandbox_invoke(mSandboxData->sandbox, gr_face_destroy, t_mGrFace);
tl_grGetFontTableCallbackData = nullptr;
t_mGrFace = nullptr;
mGrFace = t_mGrFace.to_opaque();
delete mSandboxData;
mSandboxData = nullptr;
mGrFaceInitialized = false;
}
}
void gfxFontEntry::DisconnectSVG() {
if (mSVGInitialized && mSVGGlyphs) {
mSVGGlyphs = nullptr;
mSVGInitialized = false;
}
}
bool gfxFontEntry::HasFontTable(uint32_t aTableTag) {
AutoTable table(this, aTableTag);
return table && hb_blob_get_length(table) > 0;
}
tainted_boolean_hint gfxFontEntry::HasGraphiteSpaceContextuals() {
LazyFlag flag = mHasGraphiteSpaceContextuals;
if (flag == LazyFlag::Uninitialized) {
auto face = GetGrFace();
auto t_face = rlbox::from_opaque(face);
if (t_face) {
tainted_gr<const gr_faceinfo*> faceInfo =
sandbox_invoke(mSandboxData->sandbox, gr_face_info, t_face, 0);
// Comparison with a value in sandboxed memory returns a
// tainted_boolean_hint, i.e. a "hint", since the value could be changed
// maliciously at any moment.
tainted_boolean_hint is_not_none =
faceInfo->space_contextuals != gr_faceinfo::gr_space_none;
flag = is_not_none.unverified_safe_because(
"Note ideally mHasGraphiteSpaceContextuals would be "
"tainted_boolean_hint, but RLBox does not yet support "
"bitfields, so it is not wrapped. However, its value is only "
"ever accessed through this function which returns a "
"tainted_boolean_hint, so unwrapping temporarily is safe. "
"We remove the wrapper now and re-add it below.")
? LazyFlag::Yes
: LazyFlag::No;
}
ReleaseGrFace(face); // always balance GetGrFace, even if face is null
mHasGraphiteSpaceContextuals = flag;
}
return tainted_boolean_hint(flag == LazyFlag::Yes);
}
#define FEATURE_SCRIPT_MASK 0x000000ff // script index replaces low byte of tag
static_assert(int(intl::Script::NUM_SCRIPT_CODES) <= FEATURE_SCRIPT_MASK,
"Too many script codes");
// high-order three bytes of tag with script in low-order byte
#define SCRIPT_FEATURE(s, tag) \
(((~FEATURE_SCRIPT_MASK) & (tag)) | \
((FEATURE_SCRIPT_MASK) & static_cast<uint32_t>(s)))
bool gfxFontEntry::SupportsOpenTypeFeature(Script aScript,
uint32_t aFeatureTag) {
MutexAutoLock lock(mFeatureInfoLock);
if (!mSupportedFeatures) {
mSupportedFeatures = MakeUnique<nsTHashMap<nsUint32HashKey, bool>>();
}
// note: high-order three bytes *must* be unique for each feature
// listed below (see SCRIPT_FEATURE macro def'n)
NS_ASSERTION(aFeatureTag == HB_TAG('s', 'm', 'c', 'p') ||
aFeatureTag == HB_TAG('c', '2', 's', 'c') ||
aFeatureTag == HB_TAG('p', 'c', 'a', 'p') ||
aFeatureTag == HB_TAG('c', '2', 'p', 'c') ||
aFeatureTag == HB_TAG('s', 'u', 'p', 's') ||
aFeatureTag == HB_TAG('s', 'u', 'b', 's') ||
aFeatureTag == HB_TAG('v', 'e', 'r', 't'),
"use of unknown feature tag");
// note: graphite feature support uses the last script index
NS_ASSERTION(int(aScript) < FEATURE_SCRIPT_MASK - 1,
"need to bump the size of the feature shift");
uint32_t scriptFeature = SCRIPT_FEATURE(aScript, aFeatureTag);
return mSupportedFeatures->LookupOrInsertWith(scriptFeature, [&] {
bool result = false;
auto face(GetHBFace());
if (hb_ot_layout_has_substitution(face)) {
hb_script_t hbScript =
gfxHarfBuzzShaper::GetHBScriptUsedForShaping(aScript);
// Get the OpenType tag(s) that match this script code
unsigned int scriptCount = 4;
hb_tag_t scriptTags[4];
hb_ot_tags_from_script_and_language(hbScript, HB_LANGUAGE_INVALID,
&scriptCount, scriptTags, nullptr,
nullptr);
// Append DEFAULT to the returned tags, if room
if (scriptCount < 4) {
scriptTags[scriptCount++] = HB_OT_TAG_DEFAULT_SCRIPT;
}
// Now check for 'smcp' under the first of those scripts that is present
const hb_tag_t kGSUB = HB_TAG('G', 'S', 'U', 'B');
result = std::any_of(scriptTags, scriptTags + scriptCount,
[&](const hb_tag_t& scriptTag) {
unsigned int scriptIndex;
return hb_ot_layout_table_find_script(
face, kGSUB, scriptTag, &scriptIndex) &&
hb_ot_layout_language_find_feature(
face, kGSUB, scriptIndex,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
aFeatureTag, nullptr);
});
}
return result;
});
}
const hb_set_t* gfxFontEntry::InputsForOpenTypeFeature(Script aScript,
uint32_t aFeatureTag) {
MutexAutoLock lock(mFeatureInfoLock);
if (!mFeatureInputs) {
mFeatureInputs = MakeUnique<nsTHashMap<nsUint32HashKey, hb_set_t*>>();
}
NS_ASSERTION(aFeatureTag == HB_TAG('s', 'u', 'p', 's') ||
aFeatureTag == HB_TAG('s', 'u', 'b', 's') ||
aFeatureTag == HB_TAG('v', 'e', 'r', 't'),
"use of unknown feature tag");
uint32_t scriptFeature = SCRIPT_FEATURE(aScript, aFeatureTag);
hb_set_t* inputGlyphs;
if (mFeatureInputs->Get(scriptFeature, &inputGlyphs)) {
return inputGlyphs;
}
inputGlyphs = hb_set_create();
auto face(GetHBFace());
if (hb_ot_layout_has_substitution(face)) {
hb_script_t hbScript =
gfxHarfBuzzShaper::GetHBScriptUsedForShaping(aScript);
// Get the OpenType tag(s) that match this script code
unsigned int scriptCount = 4;
hb_tag_t scriptTags[5]; // space for null terminator
hb_ot_tags_from_script_and_language(hbScript, HB_LANGUAGE_INVALID,
&scriptCount, scriptTags, nullptr,
nullptr);
// Append DEFAULT to the returned tags, if room
if (scriptCount < 4) {
scriptTags[scriptCount++] = HB_OT_TAG_DEFAULT_SCRIPT;
}
scriptTags[scriptCount++] = 0;
const hb_tag_t kGSUB = HB_TAG('G', 'S', 'U', 'B');
hb_tag_t features[2] = {aFeatureTag, HB_TAG_NONE};
hb_set_t* featurelookups = hb_set_create();
hb_ot_layout_collect_lookups(face, kGSUB, scriptTags, nullptr, features,
featurelookups);
hb_codepoint_t index = -1;
while (hb_set_next(featurelookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(face, kGSUB, index, nullptr,
inputGlyphs, nullptr, nullptr);
}
hb_set_destroy(featurelookups);
}
mFeatureInputs->InsertOrUpdate(scriptFeature, inputGlyphs);
return inputGlyphs;
}
bool gfxFontEntry::SupportsGraphiteFeature(uint32_t aFeatureTag) {
MutexAutoLock lock(mFeatureInfoLock);
if (!mSupportedFeatures) {
mSupportedFeatures = MakeUnique<nsTHashMap<nsUint32HashKey, bool>>();
}
// note: high-order three bytes *must* be unique for each feature
// listed below (see SCRIPT_FEATURE macro def'n)
NS_ASSERTION(aFeatureTag == HB_TAG('s', 'm', 'c', 'p') ||
aFeatureTag == HB_TAG('c', '2', 's', 'c') ||
aFeatureTag == HB_TAG('p', 'c', 'a', 'p') ||
aFeatureTag == HB_TAG('c', '2', 'p', 'c') ||
aFeatureTag == HB_TAG('s', 'u', 'p', 's') ||
aFeatureTag == HB_TAG('s', 'u', 'b', 's'),
"use of unknown feature tag");
// graphite feature check uses the last script slot
uint32_t scriptFeature = SCRIPT_FEATURE(FEATURE_SCRIPT_MASK, aFeatureTag);
bool result;
if (mSupportedFeatures->Get(scriptFeature, &result)) {
return result;
}
auto face = GetGrFace();
auto t_face = rlbox::from_opaque(face);
result = t_face ? sandbox_invoke(mSandboxData->sandbox, gr_face_find_fref,
t_face, aFeatureTag) != nullptr
: false;
ReleaseGrFace(face);
mSupportedFeatures->InsertOrUpdate(scriptFeature, result);
return result;
}
void gfxFontEntry::GetFeatureInfo(nsTArray<gfxFontFeatureInfo>& aFeatureInfo) {
// TODO: implement alternative code path for graphite fonts
auto autoFace(GetHBFace());
// Expose the raw hb_face_t to be captured by the lambdas (not the
// AutoHBFace wrapper).
hb_face_t* face = autoFace;
// Get the list of features for a specific <script,langSys> pair and
// append them to aFeatureInfo.
auto collectForLang = [=, &aFeatureInfo](
hb_tag_t aTableTag, unsigned int aScript,
hb_tag_t aScriptTag, unsigned int aLang,
hb_tag_t aLangTag) {
unsigned int featCount = hb_ot_layout_language_get_feature_tags(
face, aTableTag, aScript, aLang, 0, nullptr, nullptr);
AutoTArray<hb_tag_t, 32> featTags;
featTags.SetLength(featCount);
hb_ot_layout_language_get_feature_tags(face, aTableTag, aScript, aLang, 0,
&featCount, featTags.Elements());
MOZ_ASSERT(featCount <= featTags.Length());
// Just in case HB didn't fill featTags (i.e. in case it returned fewer
// tags than it promised), we truncate at the length it says it filled:
featTags.SetLength(featCount);
for (hb_tag_t t : featTags) {
aFeatureInfo.AppendElement(gfxFontFeatureInfo{t, aScriptTag, aLangTag});
}
};
// Iterate over the language systems supported by a given script,
// and call collectForLang for each of them.
auto collectForScript = [=](hb_tag_t aTableTag, unsigned int aScript,
hb_tag_t aScriptTag) {
collectForLang(aTableTag, aScript, aScriptTag,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
HB_TAG('d', 'f', 'l', 't'));
unsigned int langCount = hb_ot_layout_script_get_language_tags(
face, aTableTag, aScript, 0, nullptr, nullptr);
AutoTArray<hb_tag_t, 32> langTags;
langTags.SetLength(langCount);
hb_ot_layout_script_get_language_tags(face, aTableTag, aScript, 0,
&langCount, langTags.Elements());
MOZ_ASSERT(langCount <= langTags.Length());
langTags.SetLength(langCount);
for (unsigned int lang = 0; lang < langCount; ++lang) {
collectForLang(aTableTag, aScript, aScriptTag, lang, langTags[lang]);
}
};
// Iterate over the scripts supported by a table (GSUB or GPOS), and call
// collectForScript for each of them.
auto collectForTable = [=](hb_tag_t aTableTag) {
unsigned int scriptCount = hb_ot_layout_table_get_script_tags(
face, aTableTag, 0, nullptr, nullptr);
AutoTArray<hb_tag_t, 32> scriptTags;
scriptTags.SetLength(scriptCount);
hb_ot_layout_table_get_script_tags(face, aTableTag, 0, &scriptCount,
scriptTags.Elements());
MOZ_ASSERT(scriptCount <= scriptTags.Length());
scriptTags.SetLength(scriptCount);
for (unsigned int script = 0; script < scriptCount; ++script) {
collectForScript(aTableTag, script, scriptTags[script]);
}
};
// Collect all OpenType Layout features, both substitution and positioning,
// supported by the font resource.
collectForTable(HB_TAG('G', 'S', 'U', 'B'));
collectForTable(HB_TAG('G', 'P', 'O', 'S'));
}
typedef struct {
AutoSwap_PRUint32 version;
AutoSwap_PRUint16 format;
AutoSwap_PRUint16 horizOffset;
AutoSwap_PRUint16 vertOffset;
AutoSwap_PRUint16 reserved;
// TrackData horizData;
// TrackData vertData;
} TrakHeader;
typedef struct {
AutoSwap_PRUint16 nTracks;
AutoSwap_PRUint16 nSizes;
AutoSwap_PRUint32 sizeTableOffset;
// trackTableEntry trackTable[];
// fixed32 sizeTable[];
} TrackData;
typedef struct {
AutoSwap_PRUint32 track;
AutoSwap_PRUint16 nameIndex;
AutoSwap_PRUint16 offset;
} TrackTableEntry;
bool gfxFontEntry::HasTrackingTable() {
if (!TrakTableInitialized()) {
hb_blob_t* trak = GetFontTable(TRUETYPE_TAG('t', 'r', 'a', 'k'));
if (trak) {
// mTrakTable itself is atomic, but we also want to set the auxiliary
// pointers mTrakValues and mTrakSizeTable, so we take a lock here to
// avoid racing with another thread also initializing the same values.
AutoWriteLock lock(mLock);
if (!mTrakTable.compareExchange(kTrakTableUninitialized, trak)) {
hb_blob_destroy(trak);
} else if (!ParseTrakTable()) {
hb_blob_destroy(mTrakTable.exchange(nullptr));
}
} else {
mTrakTable.exchange(nullptr);
}
}
return GetTrakTable() != nullptr;
}
bool gfxFontEntry::ParseTrakTable() {
// Check table validity and set up the subtable pointers we need;
// if 'trak' table is invalid, or doesn't contain a 'normal' track,
// return false to tell the caller not to try using it.
unsigned int len;
const char* data = hb_blob_get_data(GetTrakTable(), &len);
if (len < sizeof(TrakHeader)) {
return false;
}
auto trak = reinterpret_cast<const TrakHeader*>(data);
uint16_t horizOffset = trak->horizOffset;
if (trak->version != 0x00010000 || uint16_t(trak->format) != 0 ||
horizOffset == 0 || uint16_t(trak->reserved) != 0) {
return false;
}
// Find the horizontal trackData, and check it doesn't overrun the buffer.
if (horizOffset > len - sizeof(TrackData)) {
return false;
}
auto trackData = reinterpret_cast<const TrackData*>(data + horizOffset);
uint16_t nTracks = trackData->nTracks;
mNumTrakSizes = trackData->nSizes;
if (nTracks == 0 || mNumTrakSizes < 2) {
return false;
}
uint32_t sizeTableOffset = trackData->sizeTableOffset;
// Find the trackTable, and check it doesn't overrun the buffer.
if (horizOffset >
len - (sizeof(TrackData) + nTracks * sizeof(TrackTableEntry))) {
return false;
}
auto trackTable = reinterpret_cast<const TrackTableEntry*>(
data + horizOffset + sizeof(TrackData));
// Look for 'normal' tracking, bail out if no such track is present.
unsigned trackIndex;
for (trackIndex = 0; trackIndex < nTracks; ++trackIndex) {
if (trackTable[trackIndex].track == 0x00000000) {
break;
}
}
if (trackIndex == nTracks) {
return false;
}
// Find list of tracking values, and check they won't overrun.
uint16_t offset = trackTable[trackIndex].offset;
if (offset > len - mNumTrakSizes * sizeof(uint16_t)) {
return false;
}
mTrakValues = reinterpret_cast<const AutoSwap_PRInt16*>(data + offset);
// Find the size subtable, and check it doesn't overrun the buffer.
mTrakSizeTable =
reinterpret_cast<const AutoSwap_PRInt32*>(data + sizeTableOffset);
if (mTrakSizeTable + mNumTrakSizes >
reinterpret_cast<const AutoSwap_PRInt32*>(data + len)) {
return false;
}
return true;
}
float gfxFontEntry::TrackingForCSSPx(float aSize) const {
// No locking because this does read-only access of fields that are inert
// once initialized.
MOZ_ASSERT(TrakTableInitialized() && mTrakTable && mTrakValues &&
mTrakSizeTable);
// Find index of first sizeTable entry that is >= the requested size.
int32_t fixedSize = int32_t(aSize * 65536.0); // float -> 16.16 fixed-point
unsigned sizeIndex;
for (sizeIndex = 0; sizeIndex < mNumTrakSizes; ++sizeIndex) {
if (mTrakSizeTable[sizeIndex] >= fixedSize) {
break;
}
}
// Return the tracking value for the requested size, or an interpolated
// value if the exact size isn't found.
if (sizeIndex == mNumTrakSizes) {
// Request is larger than last entry in the table, so just use that.
// (We don't attempt to extrapolate more extreme tracking values than
// the largest or smallest present in the table.)
return int16_t(mTrakValues[mNumTrakSizes - 1]);
}
if (sizeIndex == 0 || mTrakSizeTable[sizeIndex] == fixedSize) {
// Found an exact match, or size was smaller than the first entry.
return int16_t(mTrakValues[sizeIndex]);
}
// Requested size falls between two entries: interpolate value.
double s0 = mTrakSizeTable[sizeIndex - 1] / 65536.0; // 16.16 -> float
double s1 = mTrakSizeTable[sizeIndex] / 65536.0;
double t = (aSize - s0) / (s1 - s0);
return (1.0 - t) * int16_t(mTrakValues[sizeIndex - 1]) +
t * int16_t(mTrakValues[sizeIndex]);
}
void gfxFontEntry::SetupVariationRanges() {
// No locking because this is done during initialization before any other
// thread has access to the entry.
if (!gfxPlatform::HasVariationFontSupport() ||
!StaticPrefs::layout_css_font_variations_enabled() || !HasVariations() ||
IsUserFont()) {
return;
}
AutoTArray<gfxFontVariationAxis, 4> axes;
GetVariationAxes(axes);
for (const auto& axis : axes) {
switch (axis.mTag) {
case HB_TAG('w', 'g', 'h', 't'):
// If the axis range looks like it doesn't fit the CSS font-weight
// scale, we don't hook up the high-level property, and we mark
// the face (in mRangeFlags) as having non-standard weight. This
// means we won't map CSS font-weight to the axis. Setting 'wght'
// with font-variation-settings will still work.
// Strictly speaking, the min value should be checked against 1.0,
// not 0.0, but we'll allow font makers that amount of leeway, as
// in practice a number of fonts seem to use 0..1000.
if (axis.mMinValue >= 0.0f && axis.mMaxValue <= 1000.0f &&
// If axis.mMaxValue is less than the default weight we already
// set up, assume the axis has a non-standard range (like Skia)
// and don't try to map it.
Weight().Min() <= FontWeight::FromFloat(axis.mMaxValue)) {
if (FontWeight::FromFloat(axis.mDefaultValue) != Weight().Min()) {
mStandardFace = false;
}
mWeightRange =
WeightRange(FontWeight::FromFloat(std::max(1.0f, axis.mMinValue)),
FontWeight::FromFloat(axis.mMaxValue));
} else {
mRangeFlags |= RangeFlags::eNonCSSWeight;
}
break;
case HB_TAG('w', 'd', 't', 'h'):
if (axis.mMinValue >= 0.0f && axis.mMaxValue <= 1000.0f &&
Stretch().Min() <= FontStretch::FromFloat(axis.mMaxValue)) {
if (FontStretch::FromFloat(axis.mDefaultValue) != Stretch().Min()) {
mStandardFace = false;
}
mStretchRange = StretchRange(FontStretch::FromFloat(axis.mMinValue),
FontStretch::FromFloat(axis.mMaxValue));
} else {
mRangeFlags |= RangeFlags::eNonCSSStretch;
}
break;
case HB_TAG('s', 'l', 'n', 't'):
if (axis.mMinValue >= -90.0f && axis.mMaxValue <= 90.0f) {
if (FontSlantStyle::FromFloat(axis.mDefaultValue) !=
SlantStyle().Min()) {
mStandardFace = false;
}
// OpenType and CSS measure angles in opposite directions, so we
// have to flip signs and swap min/max when setting up the CSS
// font-style range here.
mStyleRange =
SlantStyleRange(FontSlantStyle::FromFloat(-axis.mMaxValue),
FontSlantStyle::FromFloat(-axis.mMinValue));
}
break;
case HB_TAG('i', 't', 'a', 'l'):
if (axis.mMinValue <= 0.0f && axis.mMaxValue >= 1.0f) {
if (axis.mDefaultValue != 0.0f) {
mStandardFace = false;
}
mStyleRange =
SlantStyleRange(FontSlantStyle::NORMAL, FontSlantStyle::ITALIC);
}
break;
default:
continue;
}
}
}
void gfxFontEntry::CheckForVariationAxes() {
if (mCheckedForVariationAxes) {
return;
}
mCheckedForVariationAxes = true;
if (HasVariations()) {
AutoTArray<gfxFontVariationAxis, 4> axes;
GetVariationAxes(axes);
for (const auto& axis : axes) {
if (axis.mTag == HB_TAG('w', 'g', 'h', 't') && axis.mMaxValue >= 600.0f) {
mRangeFlags |= RangeFlags::eBoldVariableWeight;
} else if (axis.mTag == HB_TAG('i', 't', 'a', 'l') &&
axis.mMaxValue >= 1.0f) {
mRangeFlags |= RangeFlags::eItalicVariation;
} else if (axis.mTag == HB_TAG('o', 'p', 's', 'z')) {
mRangeFlags |= RangeFlags::eOpticalSize;
}
}
}
}
bool gfxFontEntry::HasBoldVariableWeight() {
MOZ_ASSERT(!mIsUserFontContainer,
"should not be called for user-font containers!");
CheckForVariationAxes();
return bool(mRangeFlags & RangeFlags::eBoldVariableWeight);
}
bool gfxFontEntry::HasItalicVariation() {
MOZ_ASSERT(!mIsUserFontContainer,
"should not be called for user-font containers!");
CheckForVariationAxes();
return bool(mRangeFlags & RangeFlags::eItalicVariation);
}
bool gfxFontEntry::HasOpticalSize() {
MOZ_ASSERT(!mIsUserFontContainer,
"should not be called for user-font containers!");
CheckForVariationAxes();
return bool(mRangeFlags & RangeFlags::eOpticalSize);
}
void gfxFontEntry::GetVariationsForStyle(nsTArray<gfxFontVariation>& aResult,
const gfxFontStyle& aStyle) {
if (!gfxPlatform::HasVariationFontSupport() ||
!StaticPrefs::layout_css_font_variations_enabled()) {
return;
}
if (!HasVariations()) {
return;
}
// Resolve high-level CSS properties from the requested style
// (font-{style,weight,stretch}) to the appropriate variations.
// The value used is clamped to the range available in the font face,
// unless the face is a user font where no explicit descriptor was
// given, indicated by the corresponding 'auto' range-flag.
// We don't do these mappings if the font entry has weight and/or stretch
// ranges that do not appear to use the CSS property scale. Some older
// fonts created for QuickDrawGX/AAT may use "normalized" values where the
// standard variation is 1.0 rather than 400.0 (weight) or 100.0 (stretch).
if (!(mRangeFlags & RangeFlags::eNonCSSWeight)) {
float weight = (IsUserFont() && (mRangeFlags & RangeFlags::eAutoWeight))
? aStyle.weight.ToFloat()
: Weight().Clamp(aStyle.weight).ToFloat();
aResult.AppendElement(gfxFontVariation{HB_TAG('w', 'g', 'h', 't'), weight});
}
if (!(mRangeFlags & RangeFlags::eNonCSSStretch)) {
float stretch = (IsUserFont() && (mRangeFlags & RangeFlags::eAutoStretch))
? aStyle.stretch.ToFloat()
: Stretch().Clamp(aStyle.stretch).ToFloat();
aResult.AppendElement(
gfxFontVariation{HB_TAG('w', 'd', 't', 'h'), stretch});
}
if (aStyle.style.IsItalic() && SupportsItalic()) {
// The 'ital' axis is normally a binary toggle; intermediate values
// can only be set using font-variation-settings.
aResult.AppendElement(gfxFontVariation{HB_TAG('i', 't', 'a', 'l'), 1.0f});
} else if (SlantStyle().Min().IsOblique()) {
// Figure out what slant angle we should try to match from the
// requested style.
float angle = aStyle.style.IsNormal() ? 0.0f
: aStyle.style.IsItalic()
? FontSlantStyle::DEFAULT_OBLIQUE_DEGREES
: aStyle.style.ObliqueAngle();
// Clamp to the available range, unless the face is a user font
// with no explicit descriptor.
if (!(IsUserFont() && (mRangeFlags & RangeFlags::eAutoSlantStyle))) {
angle =
SlantStyle().Clamp(FontSlantStyle::FromFloat(angle)).ObliqueAngle();
}
// OpenType and CSS measure angles in opposite directions, so we have to
// invert the sign of the CSS oblique value when setting OpenType 'slnt'.
aResult.AppendElement(gfxFontVariation{HB_TAG('s', 'l', 'n', 't'), -angle});
}
struct TagEquals {
bool Equals(const gfxFontVariation& aIter, uint32_t aTag) const {
return aIter.mTag == aTag;
}
};
auto replaceOrAppend = [&aResult](const gfxFontVariation& aSetting) {
auto index = aResult.IndexOf(aSetting.mTag, 0, TagEquals());
if (index == aResult.NoIndex) {
aResult.AppendElement(aSetting);
} else {
aResult[index].mValue = aSetting.mValue;
}
};
// The low-level font-variation-settings descriptor from @font-face,
// if present, takes precedence over automatic variation settings
// from high-level properties.
for (const auto& v : mVariationSettings) {
replaceOrAppend(v);
}
// And the low-level font-variation-settings property takes precedence
// over the descriptor.
for (const auto& v : aStyle.variationSettings) {
replaceOrAppend(v);
}
// If there's no explicit opsz in the settings, apply 'auto' value.
if (HasOpticalSize() && aStyle.autoOpticalSize >= 0.0f) {
const uint32_t kOpszTag = HB_TAG('o', 'p', 's', 'z');
auto index = aResult.IndexOf(kOpszTag, 0, TagEquals());
if (index == aResult.NoIndex) {
float value = aStyle.autoOpticalSize * mSizeAdjust;
aResult.AppendElement(gfxFontVariation{kOpszTag, value});
}
}
}
size_t gfxFontEntry::FontTableHashEntry::SizeOfExcludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t n = 0;
if (mBlob) {
n += aMallocSizeOf(mBlob);
}
if (mSharedBlobData) {
n += mSharedBlobData->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
void gfxFontEntry::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const {
aSizes->mFontListSize += mName.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
// cmaps are shared so only non-shared cmaps are included here
if (mCharacterMap && GetCharacterMap()->mBuildOnTheFly) {
aSizes->mCharMapsSize +=
GetCharacterMap()->SizeOfIncludingThis(aMallocSizeOf);
}
{
AutoReadLock lock(mLock);
if (mFontTableCache) {
aSizes->mFontTableCacheSize +=
GetFontTableCache()->SizeOfIncludingThis(aMallocSizeOf);
}
}
// If the font has UVS data, we count that as part of the character map.
if (mUVSData) {
aSizes->mCharMapsSize += aMallocSizeOf(GetUVSData());
}
// The following, if present, are essentially cached forms of font table
// data, so we'll accumulate them together with the basic table cache.
if (mUserFontData) {
aSizes->mFontTableCacheSize +=
mUserFontData->SizeOfIncludingThis(aMallocSizeOf);
}
if (mSVGGlyphs) {
aSizes->mFontTableCacheSize +=
GetSVGGlyphs()->SizeOfIncludingThis(aMallocSizeOf);
}
{
MutexAutoLock lock(mFeatureInfoLock);
if (mSupportedFeatures) {
aSizes->mFontTableCacheSize +=
mSupportedFeatures->ShallowSizeOfIncludingThis(aMallocSizeOf);
}
if (mFeatureInputs) {
aSizes->mFontTableCacheSize +=
mFeatureInputs->ShallowSizeOfIncludingThis(aMallocSizeOf);
// XXX Can't this simply be
// aSizes->mFontTableCacheSize += 8192 * mFeatureInputs->Count();
for (auto iter = mFeatureInputs->ConstIter(); !iter.Done(); iter.Next()) {
// There's no API to get the real size of an hb_set, so we'll use
// an approximation based on knowledge of the implementation.
aSizes->mFontTableCacheSize += 8192; // vector of 64K bits
}
}
}
// We don't include the size of mCOLR/mCPAL here, because (depending on the
// font backend implementation) they will either wrap blocks of data owned
// by the system (and potentially shared), or tables that are in our font
// table cache and therefore already counted.
}
void gfxFontEntry::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const {
aSizes->mFontListSize += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
// This is used to report the size of an individual downloaded font in the
// user font cache. (Fonts that are part of the platform font list accumulate
// their sizes to the font list's reporter using the AddSizeOf... methods
// above.)
size_t gfxFontEntry::ComputedSizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
FontListSizes s = {0};
AddSizeOfExcludingThis(aMallocSizeOf, &s);
// When reporting memory used for the main platform font list,
// where we're typically summing the totals for a few hundred font faces,
// we report the fields of FontListSizes separately.
// But for downloaded user fonts, the actual resource data (added below)
// will dominate, and the minor overhead of these pieces isn't worth
// splitting out for an individual font.
size_t result = s.mFontListSize + s.mFontTableCacheSize + s.mCharMapsSize;
if (mIsDataUserFont) {
MOZ_ASSERT(mComputedSizeOfUserFont > 0, "user font with no data?");
result += mComputedSizeOfUserFont;
}
return result;
}
//////////////////////////////////////////////////////////////////////////////
//
// class gfxFontFamily
//
//////////////////////////////////////////////////////////////////////////////
// we consider faces with mStandardFace == true to be "less than" those with
// false, because during style matching, earlier entries are tried first
class FontEntryStandardFaceComparator {
public:
bool Equals(const RefPtr<gfxFontEntry>& a,
const RefPtr<gfxFontEntry>& b) const {
return a->mStandardFace == b->mStandardFace;
}
bool LessThan(const RefPtr<gfxFontEntry>& a,
const RefPtr<gfxFontEntry>& b) const {
return (a->mStandardFace == true && b->mStandardFace == false);
}
};
void gfxFontFamily::SortAvailableFonts() {
MOZ_ASSERT(mLock.LockedForWritingByCurrentThread());
mAvailableFonts.Sort(FontEntryStandardFaceComparator());
}
bool gfxFontFamily::HasOtherFamilyNames() {
// need to read in other family names to determine this
if (!mOtherFamilyNamesInitialized) {
ReadOtherFamilyNames(
gfxPlatformFontList::PlatformFontList()); // sets mHasOtherFamilyNames
}
return mHasOtherFamilyNames;
}
gfxFontEntry* gfxFontFamily::FindFontForStyle(const gfxFontStyle& aFontStyle,
bool aIgnoreSizeTolerance) {
AutoTArray<gfxFontEntry*, 4> matched;
FindAllFontsForStyle(aFontStyle, matched, aIgnoreSizeTolerance);
if (!matched.IsEmpty()) {
return matched[0];
}
return nullptr;
}