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gecko-dev/gfx/thebes/gfxFont.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/DebugOnly.h"
#include "mozilla/MathAlgorithms.h"
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif
#include "prlog.h"
#include "nsServiceManagerUtils.h"
#include "nsExpirationTracker.h"
#include "nsILanguageAtomService.h"
#include "nsITimer.h"
#include "gfxFont.h"
#include "gfxPlatform.h"
#include "nsGkAtoms.h"
#include "gfxTypes.h"
#include "gfxContext.h"
#include "gfxFontMissingGlyphs.h"
#include "gfxUserFontSet.h"
#include "gfxPlatformFontList.h"
#include "gfxScriptItemizer.h"
#include "nsUnicodeProperties.h"
#include "nsMathUtils.h"
#include "nsBidiUtils.h"
#include "nsUnicodeRange.h"
#include "nsStyleConsts.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/Telemetry.h"
#include "gfxSVGGlyphs.h"
#include "gfx2DGlue.h"
#if defined(XP_MACOSX)
#include "nsCocoaFeatures.h"
#endif
#include "cairo.h"
#include "gfxFontTest.h"
#include "harfbuzz/hb.h"
#include "harfbuzz/hb-ot.h"
#include "graphite2/Font.h"
#include "nsCRT.h"
#include "GeckoProfiler.h"
#include "gfxFontConstants.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::unicode;
using mozilla::services::GetObserverService;
gfxFontCache *gfxFontCache::gGlobalCache = nullptr;
static const char16_t kEllipsisChar[] = { 0x2026, 0x0 };
static const char16_t kASCIIPeriodsChar[] = { '.', '.', '.', 0x0 };
#ifdef DEBUG_roc
#define DEBUG_TEXT_RUN_STORAGE_METRICS
#endif
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
static uint32_t gTextRunStorageHighWaterMark = 0;
static uint32_t gTextRunStorage = 0;
static uint32_t gFontCount = 0;
static uint32_t gGlyphExtentsCount = 0;
static uint32_t gGlyphExtentsWidthsTotalSize = 0;
static uint32_t gGlyphExtentsSetupEagerSimple = 0;
static uint32_t gGlyphExtentsSetupEagerTight = 0;
static uint32_t gGlyphExtentsSetupLazyTight = 0;
static uint32_t gGlyphExtentsSetupFallBackToTight = 0;
#endif
#ifdef PR_LOGGING
#define LOG_FONTINIT(args) PR_LOG(gfxPlatform::GetLog(eGfxLog_fontinit), \
PR_LOG_DEBUG, args)
#define LOG_FONTINIT_ENABLED() PR_LOG_TEST( \
gfxPlatform::GetLog(eGfxLog_fontinit), \
PR_LOG_DEBUG)
#endif // PR_LOGGING
void
gfxCharacterMap::NotifyReleased()
{
gfxPlatformFontList *fontlist = gfxPlatformFontList::PlatformFontList();
if (mShared) {
fontlist->RemoveCmap(this);
}
delete this;
}
gfxFontEntry::gfxFontEntry() :
mItalic(false), mFixedPitch(false),
mIsProxy(false), mIsValid(true),
mIsBadUnderlineFont(false),
mIsUserFont(false),
mIsLocalUserFont(false),
mStandardFace(false),
mSymbolFont(false),
mIgnoreGDEF(false),
mIgnoreGSUB(false),
mSVGInitialized(false),
mHasSpaceFeaturesInitialized(false),
mHasSpaceFeatures(false),
mHasSpaceFeaturesKerning(false),
mHasSpaceFeaturesNonKerning(false),
mSkipDefaultFeatureSpaceCheck(false),
mCheckedForGraphiteTables(false),
mHasCmapTable(false),
mGrFaceInitialized(false),
mWeight(500), mStretch(NS_FONT_STRETCH_NORMAL),
mUVSOffset(0), mUVSData(nullptr),
mLanguageOverride(NO_FONT_LANGUAGE_OVERRIDE),
mUnitsPerEm(0),
mHBFace(nullptr),
mGrFace(nullptr),
mGrFaceRefCnt(0)
{
memset(&mDefaultSubSpaceFeatures, 0, sizeof(mDefaultSubSpaceFeatures));
memset(&mNonDefaultSubSpaceFeatures, 0, sizeof(mNonDefaultSubSpaceFeatures));
}
gfxFontEntry::gfxFontEntry(const nsAString& aName, bool aIsStandardFace) :
mName(aName), mItalic(false), mFixedPitch(false),
mIsProxy(false), mIsValid(true),
mIsBadUnderlineFont(false), mIsUserFont(false),
mIsLocalUserFont(false), mStandardFace(aIsStandardFace),
mSymbolFont(false),
mIgnoreGDEF(false),
mIgnoreGSUB(false),
mSVGInitialized(false),
mHasSpaceFeaturesInitialized(false),
mHasSpaceFeatures(false),
mHasSpaceFeaturesKerning(false),
mHasSpaceFeaturesNonKerning(false),
mSkipDefaultFeatureSpaceCheck(false),
mCheckedForGraphiteTables(false),
mHasCmapTable(false),
mGrFaceInitialized(false),
mWeight(500), mStretch(NS_FONT_STRETCH_NORMAL),
mUVSOffset(0), mUVSData(nullptr),
mLanguageOverride(NO_FONT_LANGUAGE_OVERRIDE),
mUnitsPerEm(0),
mHBFace(nullptr),
mGrFace(nullptr),
mGrFaceRefCnt(0)
{
memset(&mDefaultSubSpaceFeatures, 0, sizeof(mDefaultSubSpaceFeatures));
memset(&mNonDefaultSubSpaceFeatures, 0, sizeof(mNonDefaultSubSpaceFeatures));
}
gfxFontEntry::~gfxFontEntry()
{
// For downloaded fonts, we need to tell the user font cache that this
// entry is being deleted.
if (!mIsProxy && IsUserFont() && !IsLocalUserFont()) {
gfxUserFontSet::UserFontCache::ForgetFont(this);
}
// 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);
}
bool gfxFontEntry::IsSymbolFont()
{
return mSymbolFont;
}
bool gfxFontEntry::TestCharacterMap(uint32_t aCh)
{
if (!mCharacterMap) {
ReadCMAP();
NS_ASSERTION(mCharacterMap, "failed to initialize character map");
}
return mCharacterMap->test(aCh);
}
nsresult gfxFontEntry::InitializeUVSMap()
{
// mUVSOffset will not be initialized
// until cmap is initialized.
if (!mCharacterMap) {
ReadCMAP();
NS_ASSERTION(mCharacterMap, "failed to initialize character map");
}
if (!mUVSOffset) {
return NS_ERROR_FAILURE;
}
if (!mUVSData) {
const uint32_t kCmapTag = TRUETYPE_TAG('c','m','a','p');
AutoTable cmapTable(this, kCmapTag);
if (!cmapTable) {
mUVSOffset = 0; // don't bother to read the table again
return NS_ERROR_FAILURE;
}
uint8_t* uvsData;
unsigned int cmapLen;
const char* cmapData = hb_blob_get_data(cmapTable, &cmapLen);
nsresult rv = gfxFontUtils::ReadCMAPTableFormat14(
(const uint8_t*)cmapData + mUVSOffset,
cmapLen - mUVSOffset, uvsData);
if (NS_FAILED(rv)) {
mUVSOffset = 0; // don't bother to read the table again
return rv;
}
mUVSData = uvsData;
}
return NS_OK;
}
uint16_t gfxFontEntry::GetUVSGlyph(uint32_t aCh, uint32_t aVS)
{
InitializeUVSMap();
if (mUVSData) {
return gfxFontUtils::MapUVSToGlyphFormat14(mUVSData, aCh, aVS);
}
return 0;
}
nsresult gfxFontEntry::ReadCMAP(FontInfoData *aFontInfoData)
{
NS_ASSERTION(false, "using default no-op implementation of ReadCMAP");
mCharacterMap = new gfxCharacterMap();
return NS_OK;
}
nsString
gfxFontEntry::RealFaceName()
{
AutoTable nameTable(this, TRUETYPE_TAG('n','a','m','e'));
if (nameTable) {
nsAutoString name;
nsresult rv = gfxFontUtils::GetFullNameFromTable(nameTable, name);
if (NS_SUCCEEDED(rv)) {
return name;
}
}
return Name();
}
already_AddRefed<gfxFont>
gfxFontEntry::FindOrMakeFont(const gfxFontStyle *aStyle, bool aNeedsBold)
{
// the font entry name is the psname, not the family name
nsRefPtr<gfxFont> font = gfxFontCache::GetCache()->Lookup(this, aStyle);
if (!font) {
gfxFont *newFont = CreateFontInstance(aStyle, aNeedsBold);
if (!newFont)
return nullptr;
if (!newFont->Valid()) {
delete newFont;
return nullptr;
}
font = newFont;
gfxFontCache::GetCache()->AddNew(font);
}
return font.forget();
}
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 mSVGGlyphs->HasSVGGlyph(aGlyphId);
}
bool
gfxFontEntry::GetSVGGlyphExtents(gfxContext *aContext, uint32_t aGlyphId,
gfxRect *aResult)
{
NS_ABORT_IF_FALSE(mSVGInitialized,
"SVG data has not yet been loaded. TryGetSVGData() first.");
NS_ABORT_IF_FALSE(mUnitsPerEm >= kMinUPEM && mUnitsPerEm <= kMaxUPEM,
"font has invalid unitsPerEm");
gfxContextAutoSaveRestore matrixRestore(aContext);
cairo_matrix_t fontMatrix;
cairo_get_font_matrix(aContext->GetCairo(), &fontMatrix);
gfxMatrix svgToAppSpace = *reinterpret_cast<gfxMatrix*>(&fontMatrix);
svgToAppSpace.Scale(1.0f / mUnitsPerEm, 1.0f / mUnitsPerEm);
return mSVGGlyphs->GetGlyphExtents(aGlyphId, svgToAppSpace, aResult);
}
bool
gfxFontEntry::RenderSVGGlyph(gfxContext *aContext, uint32_t aGlyphId,
int aDrawMode, gfxTextContextPaint *aContextPaint)
{
NS_ASSERTION(mSVGInitialized, "SVG data has not yet been loaded. TryGetSVGData() first.");
return mSVGGlyphs->RenderGlyph(aContext, aGlyphId, DrawMode(aDrawMode),
aContextPaint);
}
bool
gfxFontEntry::TryGetSVGData(gfxFont* aFont)
{
if (!gfxPlatform::GetPlatform()->OpenTypeSVGEnabled()) {
return false;
}
if (!mSVGInitialized) {
mSVGInitialized = true;
// If UnitsPerEm is not known/valid, we can't use SVG glyphs
if (UnitsPerEm() == kInvalidUPEM) {
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) {
return false;
}
// gfxSVGGlyphs will hb_blob_destroy() the table when it is finished
// with it.
mSVGGlyphs = new gfxSVGGlyphs(svgTable, this);
}
if (!mFontsUsingSVGGlyphs.Contains(aFont)) {
mFontsUsingSVGGlyphs.AppendElement(aFont);
}
return !!mSVGGlyphs;
}
void
gfxFontEntry::NotifyFontDestroyed(gfxFont* aFont)
{
mFontsUsingSVGGlyphs.RemoveElement(aFont);
}
void
gfxFontEntry::NotifyGlyphsChanged()
{
for (uint32_t i = 0, count = mFontsUsingSVGGlyphs.Length(); i < count; ++i) {
gfxFont* font = mFontsUsingSVGGlyphs[i];
font->NotifyGlyphsChanged();
}
}
/**
* FontTableBlobData
*
* See FontTableHashEntry for the general strategy.
*/
class gfxFontEntry::FontTableBlobData {
public:
// Adopts the content of aBuffer.
FontTableBlobData(FallibleTArray<uint8_t>& aBuffer)
: mHashtable(nullptr), mHashKey(0)
{
MOZ_COUNT_CTOR(FontTableBlobData);
mTableData.SwapElements(aBuffer);
}
~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.SizeOfExcludingThis(aMallocSizeOf);
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
// The font table data block, owned (via adoption)
FallibleTArray<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(FallibleTArray<uint8_t>& aTable,
nsTHashtable<FontTableHashEntry> *aHashtable)
{
Clear();
// adopts elements of aTable
mSharedBlobData = new FontTableBlobData(aTable);
mBlob = hb_blob_create(mSharedBlobData->GetTable(),
mSharedBlobData->GetTableLength(),
HB_MEMORY_MODE_READONLY,
mSharedBlobData, DeleteFontTableBlobData);
if (!mSharedBlobData) {
// 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 if (mBlob) {
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)
{
if (!mFontTableCache) {
// we do this here rather than on fontEntry construction
// because not all shapers will access the table cache at all
mFontTableCache = new nsTHashtable<FontTableHashEntry>(10);
}
FontTableHashEntry *entry = mFontTableCache->GetEntry(aTag);
if (!entry) {
return false;
}
*aBlob = entry->GetBlob();
return true;
}
hb_blob_t *
gfxFontEntry::ShareFontTableAndGetBlob(uint32_t aTag,
FallibleTArray<uint8_t>* aBuffer)
{
if (MOZ_UNLIKELY(!mFontTableCache)) {
// we do this here rather than on fontEntry construction
// because not all shapers will access the table cache at all
mFontTableCache = new nsTHashtable<FontTableHashEntry>(10);
}
FontTableHashEntry *entry = mFontTableCache->PutEntry(aTag);
if (MOZ_UNLIKELY(!entry)) { // OOM
return nullptr;
}
if (!aBuffer) {
// ensure the entry is null
entry->Clear();
return nullptr;
}
return entry->ShareTableAndGetBlob(*aBuffer, mFontTableCache);
}
static int
DirEntryCmp(const void* aKey, const void* aItem)
{
int32_t tag = *static_cast<const int32_t*>(aKey);
const TableDirEntry* entry = static_cast<const TableDirEntry*>(aItem);
return tag - int32_t(entry->tag);
}
hb_blob_t*
gfxFontEntry::GetTableFromFontData(const void* aFontData, uint32_t aTableTag)
{
const SFNTHeader* header =
reinterpret_cast<const SFNTHeader*>(aFontData);
const TableDirEntry* dir =
reinterpret_cast<const TableDirEntry*>(header + 1);
dir = static_cast<const TableDirEntry*>
(bsearch(&aTableTag, dir, uint16_t(header->numTables),
sizeof(TableDirEntry), DirEntryCmp));
if (dir) {
return hb_blob_create(reinterpret_cast<const char*>(aFontData) +
dir->offset, dir->length,
HB_MEMORY_MODE_READONLY, nullptr, nullptr);
}
return nullptr;
}
already_AddRefed<gfxCharacterMap>
gfxFontEntry::GetCMAPFromFontInfo(FontInfoData *aFontInfoData,
uint32_t& aUVSOffset,
bool& aSymbolFont)
{
if (!aFontInfoData || !aFontInfoData->mLoadCmaps) {
return nullptr;
}
return aFontInfoData->GetCMAP(mName, aUVSOffset, aSymbolFont);
}
hb_blob_t *
gfxFontEntry::GetFontTable(uint32_t aTag)
{
hb_blob_t *blob;
if (GetExistingFontTable(aTag, &blob)) {
return blob;
}
FallibleTArray<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);
}
/*static*/ void
gfxFontEntry::HBFaceDeletedCallback(void *aUserData)
{
gfxFontEntry *fe = static_cast<gfxFontEntry*>(aUserData);
fe->ForgetHBFace();
}
void
gfxFontEntry::ForgetHBFace()
{
mHBFace = nullptr;
}
hb_face_t*
gfxFontEntry::GetHBFace()
{
if (!mHBFace) {
mHBFace = hb_face_create_for_tables(HBGetTable, this,
HBFaceDeletedCallback);
return mHBFace;
}
return hb_face_reference(mHBFace);
}
/*static*/ const void*
gfxFontEntry::GrGetTable(const void *aAppFaceHandle, unsigned int aName,
size_t *aLen)
{
gfxFontEntry *fontEntry =
static_cast<gfxFontEntry*>(const_cast<void*>(aAppFaceHandle));
hb_blob_t *blob = fontEntry->GetFontTable(aName);
if (blob) {
unsigned int blobLength;
const void *tableData = hb_blob_get_data(blob, &blobLength);
fontEntry->mGrTableMap->Put(tableData, blob);
*aLen = blobLength;
return tableData;
}
*aLen = 0;
return nullptr;
}
/*static*/ void
gfxFontEntry::GrReleaseTable(const void *aAppFaceHandle,
const void *aTableBuffer)
{
gfxFontEntry *fontEntry =
static_cast<gfxFontEntry*>(const_cast<void*>(aAppFaceHandle));
void *data;
if (fontEntry->mGrTableMap->Get(aTableBuffer, &data)) {
fontEntry->mGrTableMap->Remove(aTableBuffer);
hb_blob_destroy(static_cast<hb_blob_t*>(data));
}
}
gr_face*
gfxFontEntry::GetGrFace()
{
if (!mGrFaceInitialized) {
gr_face_ops faceOps = {
sizeof(gr_face_ops),
GrGetTable,
GrReleaseTable
};
mGrTableMap = new nsDataHashtable<nsPtrHashKey<const void>,void*>;
mGrFace = gr_make_face_with_ops(this, &faceOps, gr_face_default);
mGrFaceInitialized = true;
}
++mGrFaceRefCnt;
return mGrFace;
}
void
gfxFontEntry::ReleaseGrFace(gr_face *aFace)
{
MOZ_ASSERT(aFace == mGrFace); // sanity-check
MOZ_ASSERT(mGrFaceRefCnt > 0);
if (--mGrFaceRefCnt == 0) {
gr_face_destroy(mGrFace);
mGrFace = nullptr;
mGrFaceInitialized = false;
delete mGrTableMap;
mGrTableMap = nullptr;
}
}
void
gfxFontEntry::DisconnectSVG()
{
if (mSVGInitialized && mSVGGlyphs) {
mSVGGlyphs = nullptr;
mSVGInitialized = false;
}
}
void
gfxFontEntry::CheckForGraphiteTables()
{
AutoTable silfTable(this, TRUETYPE_TAG('S','i','l','f'));
mHasGraphiteTables = silfTable && hb_blob_get_length(silfTable) > 0;
}
/* static */ size_t
gfxFontEntry::FontTableHashEntry::SizeOfEntryExcludingThis
(FontTableHashEntry *aEntry,
MallocSizeOf aMallocSizeOf,
void* aUserArg)
{
size_t n = 0;
if (aEntry->mBlob) {
n += aMallocSizeOf(aEntry->mBlob);
}
if (aEntry->mSharedBlobData) {
n += aEntry->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 && mCharacterMap->mBuildOnTheFly) {
aSizes->mCharMapsSize +=
mCharacterMap->SizeOfIncludingThis(aMallocSizeOf);
}
if (mFontTableCache) {
aSizes->mFontTableCacheSize +=
mFontTableCache->SizeOfExcludingThis(
FontTableHashEntry::SizeOfEntryExcludingThis,
aMallocSizeOf);
}
}
void
gfxFontEntry::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const
{
aSizes->mFontListSize += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
//////////////////////////////////////////////////////////////////////////////
//
// class gfxFontFamily
//
//////////////////////////////////////////////////////////////////////////////
// we consider faces with mStandardFace == true to be "greater than" those with false,
// because during style matching, later entries will replace earlier ones
class FontEntryStandardFaceComparator {
public:
bool Equals(const nsRefPtr<gfxFontEntry>& a, const nsRefPtr<gfxFontEntry>& b) const {
return a->mStandardFace == b->mStandardFace;
}
bool LessThan(const nsRefPtr<gfxFontEntry>& a, const nsRefPtr<gfxFontEntry>& b) const {
return (a->mStandardFace == false && b->mStandardFace == true);
}
};
void
gfxFontFamily::SortAvailableFonts()
{
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& aNeedsSyntheticBold)
{
if (!mHasStyles)
FindStyleVariations(); // collect faces for the family, if not already done
NS_ASSERTION(mAvailableFonts.Length() > 0, "font family with no faces!");
aNeedsSyntheticBold = false;
int8_t baseWeight = aFontStyle.ComputeWeight();
bool wantBold = baseWeight >= 6;
// If the family has only one face, we simply return it; no further checking needed
if (mAvailableFonts.Length() == 1) {
gfxFontEntry *fe = mAvailableFonts[0];
aNeedsSyntheticBold = wantBold && !fe->IsBold();
return fe;
}
bool wantItalic = (aFontStyle.style &
(NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) != 0;
// Most families are "simple", having just Regular/Bold/Italic/BoldItalic,
// or some subset of these. In this case, we have exactly 4 entries in mAvailableFonts,
// stored in the above order; note that some of the entries may be nullptr.
// We can then pick the required entry based on whether the request is for
// bold or non-bold, italic or non-italic, without running the more complex
// matching algorithm used for larger families with many weights and/or widths.
if (mIsSimpleFamily) {
// Family has no more than the "standard" 4 faces, at fixed indexes;
// calculate which one we want.
// Note that we cannot simply return it as not all 4 faces are necessarily present.
uint8_t faceIndex = (wantItalic ? kItalicMask : 0) |
(wantBold ? kBoldMask : 0);
// if the desired style is available, return it directly
gfxFontEntry *fe = mAvailableFonts[faceIndex];
if (fe) {
// no need to set aNeedsSyntheticBold here as we matched the boldness request
return fe;
}
// order to check fallback faces in a simple family, depending on requested style
static const uint8_t simpleFallbacks[4][3] = {
{ kBoldFaceIndex, kItalicFaceIndex, kBoldItalicFaceIndex }, // fallbacks for Regular
{ kRegularFaceIndex, kBoldItalicFaceIndex, kItalicFaceIndex },// Bold
{ kBoldItalicFaceIndex, kRegularFaceIndex, kBoldFaceIndex }, // Italic
{ kItalicFaceIndex, kBoldFaceIndex, kRegularFaceIndex } // BoldItalic
};
const uint8_t *order = simpleFallbacks[faceIndex];
for (uint8_t trial = 0; trial < 3; ++trial) {
// check remaining faces in order of preference to find the first that actually exists
fe = mAvailableFonts[order[trial]];
if (fe) {
aNeedsSyntheticBold = wantBold && !fe->IsBold();
return fe;
}
}
// this can't happen unless we have totally broken the font-list manager!
NS_NOTREACHED("no face found in simple font family!");
return nullptr;
}
// This is a large/rich font family, so we do full style- and weight-matching:
// first collect a list of weights that are the best match for the requested
// font-stretch and font-style, then pick the best weight match among those
// available.
gfxFontEntry *weightList[10] = { 0 };
bool foundWeights = FindWeightsForStyle(weightList, wantItalic, aFontStyle.stretch);
if (!foundWeights) {
return nullptr;
}
// First find a match for the best weight
int8_t matchBaseWeight = 0;
int8_t i = baseWeight;
// Need to special case when normal face doesn't exist but medium does.
// In that case, use medium otherwise weights < 400
if (baseWeight == 4 && !weightList[4]) {
i = 5; // medium
}
// Loop through weights, since one exists loop will terminate
int8_t direction = (baseWeight > 5) ? 1 : -1;
for (; ; i += direction) {
if (weightList[i]) {
matchBaseWeight = i;
break;
}
// If we've reached one side without finding a font,
// start over and go the other direction until we find a match
if (i == 1 || i == 9) {
i = baseWeight;
direction = -direction;
}
}
NS_ASSERTION(matchBaseWeight != 0,
"weight mapping should always find at least one font in a family");
gfxFontEntry *matchFE = weightList[matchBaseWeight];
NS_ASSERTION(matchFE,
"weight mapping should always find at least one font in a family");
if (!matchFE->IsBold() && baseWeight >= 6)
{
aNeedsSyntheticBold = true;
}
return matchFE;
}
void
gfxFontFamily::CheckForSimpleFamily()
{
// already checked this family
if (mIsSimpleFamily) {
return;
};
uint32_t count = mAvailableFonts.Length();
if (count > 4 || count == 0) {
return; // can't be "simple" if there are >4 faces;
// if none then the family is unusable anyway
}
if (count == 1) {
mIsSimpleFamily = true;
return;
}
int16_t firstStretch = mAvailableFonts[0]->Stretch();
gfxFontEntry *faces[4] = { 0 };
for (uint8_t i = 0; i < count; ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (fe->Stretch() != firstStretch) {
return; // font-stretch doesn't match, don't treat as simple family
}
uint8_t faceIndex = (fe->IsItalic() ? kItalicMask : 0) |
(fe->Weight() >= 600 ? kBoldMask : 0);
if (faces[faceIndex]) {
return; // two faces resolve to the same slot; family isn't "simple"
}
faces[faceIndex] = fe;
}
// we have successfully slotted the available faces into the standard
// 4-face framework
mAvailableFonts.SetLength(4);
for (uint8_t i = 0; i < 4; ++i) {
if (mAvailableFonts[i].get() != faces[i]) {
mAvailableFonts[i].swap(faces[i]);
}
}
mIsSimpleFamily = true;
}
static inline uint32_t
StyleDistance(gfxFontEntry *aFontEntry,
bool anItalic, int16_t aStretch)
{
// Compute a measure of the "distance" between the requested style
// and the given fontEntry,
// considering italicness and font-stretch but not weight.
int32_t distance = 0;
if (aStretch != aFontEntry->mStretch) {
// stretch values are in the range -4 .. +4
// if aStretch is positive, we prefer more-positive values;
// if zero or negative, prefer more-negative
if (aStretch > 0) {
distance = (aFontEntry->mStretch - aStretch) * 2;
} else {
distance = (aStretch - aFontEntry->mStretch) * 2;
}
// if the computed "distance" here is negative, it means that
// aFontEntry lies in the "non-preferred" direction from aStretch,
// so we treat that as larger than any preferred-direction distance
// (max possible is 8) by adding an extra 10 to the absolute value
if (distance < 0) {
distance = -distance + 10;
}
}
if (aFontEntry->IsItalic() != anItalic) {
distance += 1;
}
return uint32_t(distance);
}
bool
gfxFontFamily::FindWeightsForStyle(gfxFontEntry* aFontsForWeights[],
bool anItalic, int16_t aStretch)
{
uint32_t foundWeights = 0;
uint32_t bestMatchDistance = 0xffffffff;
uint32_t count = mAvailableFonts.Length();
for (uint32_t i = 0; i < count; i++) {
// this is not called for "simple" families, and therefore it does not
// need to check the mAvailableFonts entries for nullptr.
gfxFontEntry *fe = mAvailableFonts[i];
uint32_t distance = StyleDistance(fe, anItalic, aStretch);
if (distance <= bestMatchDistance) {
int8_t wt = fe->mWeight / 100;
NS_ASSERTION(wt >= 1 && wt < 10, "invalid weight in fontEntry");
if (!aFontsForWeights[wt]) {
// record this as a possible candidate for weight matching
aFontsForWeights[wt] = fe;
++foundWeights;
} else {
uint32_t prevDistance =
StyleDistance(aFontsForWeights[wt], anItalic, aStretch);
if (prevDistance >= distance) {
// replacing a weight we already found,
// so don't increment foundWeights
aFontsForWeights[wt] = fe;
}
}
bestMatchDistance = distance;
}
}
NS_ASSERTION(foundWeights > 0, "Font family containing no faces?");
if (foundWeights == 1) {
// no need to cull entries if we only found one weight
return true;
}
// we might have recorded some faces that were a partial style match, but later found
// others that were closer; in this case, we need to cull the poorer matches from the
// weight list we'll return
for (uint32_t i = 0; i < 10; ++i) {
if (aFontsForWeights[i] &&
StyleDistance(aFontsForWeights[i], anItalic, aStretch) > bestMatchDistance)
{
aFontsForWeights[i] = 0;
}
}
return (foundWeights > 0);
}
void gfxFontFamily::LocalizedName(nsAString& aLocalizedName)
{
// just return the primary name; subclasses should override
aLocalizedName = mName;
}
// metric for how close a given font matches a style
static int32_t
CalcStyleMatch(gfxFontEntry *aFontEntry, const gfxFontStyle *aStyle)
{
int32_t rank = 0;
if (aStyle) {
// italics
bool wantItalic =
(aStyle->style & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) != 0;
if (aFontEntry->IsItalic() == wantItalic) {
rank += 10;
}
// measure of closeness of weight to the desired value
rank += 9 - DeprecatedAbs(aFontEntry->Weight() / 100 - aStyle->ComputeWeight());
} else {
// if no font to match, prefer non-bold, non-italic fonts
if (!aFontEntry->IsItalic()) {
rank += 3;
}
if (!aFontEntry->IsBold()) {
rank += 2;
}
}
return rank;
}
#define RANK_MATCHED_CMAP 20
void
gfxFontFamily::FindFontForChar(GlobalFontMatch *aMatchData)
{
if (mFamilyCharacterMapInitialized && !TestCharacterMap(aMatchData->mCh)) {
// none of the faces in the family support the required char,
// so bail out immediately
return;
}
bool needsBold;
gfxFontStyle normal;
gfxFontEntry *fe = FindFontForStyle(
(aMatchData->mStyle == nullptr) ? *aMatchData->mStyle : normal,
needsBold);
if (fe && !fe->SkipDuringSystemFallback()) {
int32_t rank = 0;
if (fe->TestCharacterMap(aMatchData->mCh)) {
rank += RANK_MATCHED_CMAP;
aMatchData->mCount++;
#ifdef PR_LOGGING
PRLogModuleInfo *log = gfxPlatform::GetLog(eGfxLog_textrun);
if (MOZ_UNLIKELY(log)) {
uint32_t unicodeRange = FindCharUnicodeRange(aMatchData->mCh);
uint32_t script = GetScriptCode(aMatchData->mCh);
PR_LOG(log, PR_LOG_DEBUG,\
("(textrun-systemfallback-fonts) char: u+%6.6x "
"unicode-range: %d script: %d match: [%s]\n",
aMatchData->mCh,
unicodeRange, script,
NS_ConvertUTF16toUTF8(fe->Name()).get()));
}
#endif
}
aMatchData->mCmapsTested++;
if (rank == 0) {
return;
}
// omitting from original windows code -- family name, lang group, pitch
// not available in current FontEntry implementation
rank += CalcStyleMatch(fe, aMatchData->mStyle);
// xxx - add whether AAT font with morphing info for specific lang groups
if (rank > aMatchData->mMatchRank
|| (rank == aMatchData->mMatchRank &&
Compare(fe->Name(), aMatchData->mBestMatch->Name()) > 0))
{
aMatchData->mBestMatch = fe;
aMatchData->mMatchedFamily = this;
aMatchData->mMatchRank = rank;
}
}
}
void
gfxFontFamily::SearchAllFontsForChar(GlobalFontMatch *aMatchData)
{
uint32_t i, numFonts = mAvailableFonts.Length();
for (i = 0; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i];
if (fe && fe->TestCharacterMap(aMatchData->mCh)) {
int32_t rank = RANK_MATCHED_CMAP;
rank += CalcStyleMatch(fe, aMatchData->mStyle);
if (rank > aMatchData->mMatchRank
|| (rank == aMatchData->mMatchRank &&
Compare(fe->Name(), aMatchData->mBestMatch->Name()) > 0))
{
aMatchData->mBestMatch = fe;
aMatchData->mMatchedFamily = this;
aMatchData->mMatchRank = rank;
}
}
}
}
/*static*/ void
gfxFontFamily::ReadOtherFamilyNamesForFace(const nsAString& aFamilyName,
const char *aNameData,
uint32_t aDataLength,
nsTArray<nsString>& aOtherFamilyNames,
bool useFullName)
{
const gfxFontUtils::NameHeader *nameHeader =
reinterpret_cast<const gfxFontUtils::NameHeader*>(aNameData);
uint32_t nameCount = nameHeader->count;
if (nameCount * sizeof(gfxFontUtils::NameRecord) > aDataLength) {
NS_WARNING("invalid font (name records)");
return;
}
const gfxFontUtils::NameRecord *nameRecord =
reinterpret_cast<const gfxFontUtils::NameRecord*>(aNameData + sizeof(gfxFontUtils::NameHeader));
uint32_t stringsBase = uint32_t(nameHeader->stringOffset);
for (uint32_t i = 0; i < nameCount; i++, nameRecord++) {
uint32_t nameLen = nameRecord->length;
uint32_t nameOff = nameRecord->offset; // offset from base of string storage
if (stringsBase + nameOff + nameLen > aDataLength) {
NS_WARNING("invalid font (name table strings)");
return;
}
uint16_t nameID = nameRecord->nameID;
if ((useFullName && nameID == gfxFontUtils::NAME_ID_FULL) ||
(!useFullName && (nameID == gfxFontUtils::NAME_ID_FAMILY ||
nameID == gfxFontUtils::NAME_ID_PREFERRED_FAMILY))) {
nsAutoString otherFamilyName;
bool ok = gfxFontUtils::DecodeFontName(aNameData + stringsBase + nameOff,
nameLen,
uint32_t(nameRecord->platformID),
uint32_t(nameRecord->encodingID),
uint32_t(nameRecord->languageID),
otherFamilyName);
// add if not same as canonical family name
if (ok && otherFamilyName != aFamilyName) {
aOtherFamilyNames.AppendElement(otherFamilyName);
}
}
}
}
// returns true if other names were found, false otherwise
bool
gfxFontFamily::ReadOtherFamilyNamesForFace(gfxPlatformFontList *aPlatformFontList,
hb_blob_t *aNameTable,
bool useFullName)
{
uint32_t dataLength;
const char *nameData = hb_blob_get_data(aNameTable, &dataLength);
nsAutoTArray<nsString,4> otherFamilyNames;
ReadOtherFamilyNamesForFace(mName, nameData, dataLength,
otherFamilyNames, useFullName);
uint32_t n = otherFamilyNames.Length();
for (uint32_t i = 0; i < n; i++) {
aPlatformFontList->AddOtherFamilyName(this, otherFamilyNames[i]);
}
return n != 0;
}
void
gfxFontFamily::ReadOtherFamilyNames(gfxPlatformFontList *aPlatformFontList)
{
if (mOtherFamilyNamesInitialized)
return;
mOtherFamilyNamesInitialized = true;
FindStyleVariations();
// read in other family names for the first face in the list
uint32_t i, numFonts = mAvailableFonts.Length();
const uint32_t kNAME = TRUETYPE_TAG('n','a','m','e');
for (i = 0; i < numFonts; ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (!fe) {
continue;
}
gfxFontEntry::AutoTable nameTable(fe, kNAME);
if (!nameTable) {
continue;
}
mHasOtherFamilyNames = ReadOtherFamilyNamesForFace(aPlatformFontList,
nameTable);
break;
}
// read in other names for the first face in the list with the assumption
// that if extra names don't exist in that face then they don't exist in
// other faces for the same font
if (!mHasOtherFamilyNames)
return;
// read in names for all faces, needed to catch cases where fonts have
// family names for individual weights (e.g. Hiragino Kaku Gothic Pro W6)
for ( ; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i];
if (!fe) {
continue;
}
gfxFontEntry::AutoTable nameTable(fe, kNAME);
if (!nameTable) {
continue;
}
ReadOtherFamilyNamesForFace(aPlatformFontList, nameTable);
}
}
void
gfxFontFamily::ReadFaceNames(gfxPlatformFontList *aPlatformFontList,
bool aNeedFullnamePostscriptNames,
FontInfoData *aFontInfoData)
{
// if all needed names have already been read, skip
if (mOtherFamilyNamesInitialized &&
(mFaceNamesInitialized || !aNeedFullnamePostscriptNames))
return;
bool asyncFontLoaderDisabled = false;
#if defined(XP_MACOSX)
// bug 975460 - async font loader crashes sometimes under 10.6, disable
if (!nsCocoaFeatures::OnLionOrLater()) {
asyncFontLoaderDisabled = true;
}
#endif
if (!mOtherFamilyNamesInitialized &&
aFontInfoData &&
aFontInfoData->mLoadOtherNames &&
!asyncFontLoaderDisabled)
{
nsAutoTArray<nsString,4> otherFamilyNames;
bool foundOtherNames =
aFontInfoData->GetOtherFamilyNames(mName, otherFamilyNames);
if (foundOtherNames) {
uint32_t i, n = otherFamilyNames.Length();
for (i = 0; i < n; i++) {
aPlatformFontList->AddOtherFamilyName(this, otherFamilyNames[i]);
}
}
mOtherFamilyNamesInitialized = true;
}
// if all needed data has been initialized, return
if (mOtherFamilyNamesInitialized &&
(mFaceNamesInitialized || !aNeedFullnamePostscriptNames)) {
return;
}
FindStyleVariations(aFontInfoData);
// check again, as style enumeration code may have loaded names
if (mOtherFamilyNamesInitialized &&
(mFaceNamesInitialized || !aNeedFullnamePostscriptNames)) {
return;
}
uint32_t i, numFonts = mAvailableFonts.Length();
const uint32_t kNAME = TRUETYPE_TAG('n','a','m','e');
bool firstTime = true, readAllFaces = false;
for (i = 0; i < numFonts; ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (!fe) {
continue;
}
nsAutoString fullname, psname;
bool foundFaceNames = false;
if (!mFaceNamesInitialized &&
aNeedFullnamePostscriptNames &&
aFontInfoData &&
aFontInfoData->mLoadFaceNames) {
aFontInfoData->GetFaceNames(fe->Name(), fullname, psname);
if (!fullname.IsEmpty()) {
aPlatformFontList->AddFullname(fe, fullname);
}
if (!psname.IsEmpty()) {
aPlatformFontList->AddPostscriptName(fe, psname);
}
foundFaceNames = true;
// found everything needed? skip to next font
if (mOtherFamilyNamesInitialized) {
continue;
}
}
// load directly from the name table
gfxFontEntry::AutoTable nameTable(fe, kNAME);
if (!nameTable) {
continue;
}
if (aNeedFullnamePostscriptNames && !foundFaceNames) {
if (gfxFontUtils::ReadCanonicalName(
nameTable, gfxFontUtils::NAME_ID_FULL, fullname) == NS_OK)
{
aPlatformFontList->AddFullname(fe, fullname);
}
if (gfxFontUtils::ReadCanonicalName(
nameTable, gfxFontUtils::NAME_ID_POSTSCRIPT, psname) == NS_OK)
{
aPlatformFontList->AddPostscriptName(fe, psname);
}
}
if (!mOtherFamilyNamesInitialized && (firstTime || readAllFaces)) {
bool foundOtherName = ReadOtherFamilyNamesForFace(aPlatformFontList,
nameTable);
// if the first face has a different name, scan all faces, otherwise
// assume the family doesn't have other names
if (firstTime && foundOtherName) {
mHasOtherFamilyNames = true;
readAllFaces = true;
}
firstTime = false;
}
// if not reading in any more names, skip other faces
if (!readAllFaces && !aNeedFullnamePostscriptNames) {
break;
}
}
mFaceNamesInitialized = true;
mOtherFamilyNamesInitialized = true;
}
gfxFontEntry*
gfxFontFamily::FindFont(const nsAString& aPostscriptName)
{
// find the font using a simple linear search
uint32_t numFonts = mAvailableFonts.Length();
for (uint32_t i = 0; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i].get();
if (fe && fe->Name() == aPostscriptName)
return fe;
}
return nullptr;
}
void
gfxFontFamily::ReadAllCMAPs(FontInfoData *aFontInfoData)
{
FindStyleVariations(aFontInfoData);
uint32_t i, numFonts = mAvailableFonts.Length();
for (i = 0; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i];
// don't try to load cmaps for downloadable fonts not yet loaded
if (!fe || fe->mIsProxy) {
continue;
}
fe->ReadCMAP(aFontInfoData);
mFamilyCharacterMap.Union(*(fe->mCharacterMap));
}
mFamilyCharacterMap.Compact();
mFamilyCharacterMapInitialized = true;
}
void
gfxFontFamily::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const
{
aSizes->mFontListSize +=
mName.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
aSizes->mCharMapsSize +=
mFamilyCharacterMap.SizeOfExcludingThis(aMallocSizeOf);
aSizes->mFontListSize +=
mAvailableFonts.SizeOfExcludingThis(aMallocSizeOf);
for (uint32_t i = 0; i < mAvailableFonts.Length(); ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (fe) {
fe->AddSizeOfIncludingThis(aMallocSizeOf, aSizes);
}
}
}
void
gfxFontFamily::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontListSizes* aSizes) const
{
aSizes->mFontListSize += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
/*
* gfxFontCache - global cache of gfxFont instances.
* Expires unused fonts after a short interval;
* notifies fonts to age their cached shaped-word records;
* observes memory-pressure notification and tells fonts to clear their
* shaped-word caches to free up memory.
*/
MOZ_DEFINE_MALLOC_SIZE_OF(FontCacheMallocSizeOf)
NS_IMPL_ISUPPORTS1(gfxFontCache::MemoryReporter, nsIMemoryReporter)
NS_IMETHODIMP
gfxFontCache::MemoryReporter::CollectReports
(nsIMemoryReporterCallback* aCb,
nsISupports* aClosure)
{
FontCacheSizes sizes;
gfxFontCache::GetCache()->AddSizeOfIncludingThis(&FontCacheMallocSizeOf,
&sizes);
aCb->Callback(EmptyCString(),
NS_LITERAL_CSTRING("explicit/gfx/font-cache"),
KIND_HEAP, UNITS_BYTES, sizes.mFontInstances,
NS_LITERAL_CSTRING("Memory used for active font instances."),
aClosure);
aCb->Callback(EmptyCString(),
NS_LITERAL_CSTRING("explicit/gfx/font-shaped-words"),
KIND_HEAP, UNITS_BYTES, sizes.mShapedWords,
NS_LITERAL_CSTRING("Memory used to cache shaped glyph data."),
aClosure);
return NS_OK;
}
NS_IMPL_ISUPPORTS1(gfxFontCache::Observer, nsIObserver)
NS_IMETHODIMP
gfxFontCache::Observer::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *someData)
{
if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
gfxFontCache *fontCache = gfxFontCache::GetCache();
if (fontCache) {
fontCache->FlushShapedWordCaches();
}
} else {
NS_NOTREACHED("unexpected notification topic");
}
return NS_OK;
}
nsresult
gfxFontCache::Init()
{
NS_ASSERTION(!gGlobalCache, "Where did this come from?");
gGlobalCache = new gfxFontCache();
if (!gGlobalCache) {
return NS_ERROR_OUT_OF_MEMORY;
}
RegisterStrongMemoryReporter(new MemoryReporter());
return NS_OK;
}
void
gfxFontCache::Shutdown()
{
delete gGlobalCache;
gGlobalCache = nullptr;
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
printf("Textrun storage high water mark=%d\n", gTextRunStorageHighWaterMark);
printf("Total number of fonts=%d\n", gFontCount);
printf("Total glyph extents allocated=%d (size %d)\n", gGlyphExtentsCount,
int(gGlyphExtentsCount*sizeof(gfxGlyphExtents)));
printf("Total glyph extents width-storage size allocated=%d\n", gGlyphExtentsWidthsTotalSize);
printf("Number of simple glyph extents eagerly requested=%d\n", gGlyphExtentsSetupEagerSimple);
printf("Number of tight glyph extents eagerly requested=%d\n", gGlyphExtentsSetupEagerTight);
printf("Number of tight glyph extents lazily requested=%d\n", gGlyphExtentsSetupLazyTight);
printf("Number of simple glyph extent setups that fell back to tight=%d\n", gGlyphExtentsSetupFallBackToTight);
#endif
}
gfxFontCache::gfxFontCache()
: nsExpirationTracker<gfxFont,3>(FONT_TIMEOUT_SECONDS * 1000)
{
nsCOMPtr<nsIObserverService> obs = GetObserverService();
if (obs) {
obs->AddObserver(new Observer, "memory-pressure", false);
}
#ifndef RELEASE_BUILD
// Currently disabled for release builds, due to unexplained crashes
// during expiration; see bug 717175 & 894798.
mWordCacheExpirationTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mWordCacheExpirationTimer) {
mWordCacheExpirationTimer->
InitWithFuncCallback(WordCacheExpirationTimerCallback, this,
SHAPED_WORD_TIMEOUT_SECONDS * 1000,
nsITimer::TYPE_REPEATING_SLACK);
}
#endif
}
gfxFontCache::~gfxFontCache()
{
// Ensure the user font cache releases its references to font entries,
// so they aren't kept alive after the font instances and font-list
// have been shut down.
gfxUserFontSet::UserFontCache::Shutdown();
if (mWordCacheExpirationTimer) {
mWordCacheExpirationTimer->Cancel();
mWordCacheExpirationTimer = nullptr;
}
// Expire everything that has a zero refcount, so we don't leak them.
AgeAllGenerations();
// All fonts should be gone.
NS_WARN_IF_FALSE(mFonts.Count() == 0,
"Fonts still alive while shutting down gfxFontCache");
// Note that we have to delete everything through the expiration
// tracker, since there might be fonts not in the hashtable but in
// the tracker.
}
bool
gfxFontCache::HashEntry::KeyEquals(const KeyTypePointer aKey) const
{
return aKey->mFontEntry == mFont->GetFontEntry() &&
aKey->mStyle->Equals(*mFont->GetStyle());
}
already_AddRefed<gfxFont>
gfxFontCache::Lookup(const gfxFontEntry *aFontEntry,
const gfxFontStyle *aStyle)
{
Key key(aFontEntry, aStyle);
HashEntry *entry = mFonts.GetEntry(key);
Telemetry::Accumulate(Telemetry::FONT_CACHE_HIT, entry != nullptr);
if (!entry)
return nullptr;
nsRefPtr<gfxFont> font = entry->mFont;
return font.forget();
}
void
gfxFontCache::AddNew(gfxFont *aFont)
{
Key key(aFont->GetFontEntry(), aFont->GetStyle());
HashEntry *entry = mFonts.PutEntry(key);
if (!entry)
return;
gfxFont *oldFont = entry->mFont;
entry->mFont = aFont;
// Assert that we can find the entry we just put in (this fails if the key
// has a NaN float value in it, e.g. 'sizeAdjust').
MOZ_ASSERT(entry == mFonts.GetEntry(key));
// If someone's asked us to replace an existing font entry, then that's a
// bit weird, but let it happen, and expire the old font if it's not used.
if (oldFont && oldFont->GetExpirationState()->IsTracked()) {
// if oldFont == aFont, recount should be > 0,
// so we shouldn't be here.
NS_ASSERTION(aFont != oldFont, "new font is tracked for expiry!");
NotifyExpired(oldFont);
}
}
void
gfxFontCache::NotifyReleased(gfxFont *aFont)
{
nsresult rv = AddObject(aFont);
if (NS_FAILED(rv)) {
// We couldn't track it for some reason. Kill it now.
DestroyFont(aFont);
}
// Note that we might have fonts that aren't in the hashtable, perhaps because
// of OOM adding to the hashtable or because someone did an AddNew where
// we already had a font. These fonts are added to the expiration tracker
// anyway, even though Lookup can't resurrect them. Eventually they will
// expire and be deleted.
}
void
gfxFontCache::NotifyExpired(gfxFont *aFont)
{
aFont->ClearCachedWords();
RemoveObject(aFont);
DestroyFont(aFont);
}
void
gfxFontCache::DestroyFont(gfxFont *aFont)
{
Key key(aFont->GetFontEntry(), aFont->GetStyle());
HashEntry *entry = mFonts.GetEntry(key);
if (entry && entry->mFont == aFont) {
mFonts.RemoveEntry(key);
}
NS_ASSERTION(aFont->GetRefCount() == 0,
"Destroying with non-zero ref count!");
delete aFont;
}
/*static*/
PLDHashOperator
gfxFontCache::AgeCachedWordsForFont(HashEntry* aHashEntry, void* aUserData)
{
aHashEntry->mFont->AgeCachedWords();
return PL_DHASH_NEXT;
}
/*static*/
void
gfxFontCache::WordCacheExpirationTimerCallback(nsITimer* aTimer, void* aCache)
{
gfxFontCache* cache = static_cast<gfxFontCache*>(aCache);
cache->mFonts.EnumerateEntries(AgeCachedWordsForFont, nullptr);
}
/*static*/
PLDHashOperator
gfxFontCache::ClearCachedWordsForFont(HashEntry* aHashEntry, void* aUserData)
{
aHashEntry->mFont->ClearCachedWords();
return PL_DHASH_NEXT;
}
/*static*/
size_t
gfxFontCache::AddSizeOfFontEntryExcludingThis(HashEntry* aHashEntry,
MallocSizeOf aMallocSizeOf,
void* aUserArg)
{
HashEntry *entry = static_cast<HashEntry*>(aHashEntry);
FontCacheSizes *sizes = static_cast<FontCacheSizes*>(aUserArg);
entry->mFont->AddSizeOfExcludingThis(aMallocSizeOf, sizes);
// The entry's size is recorded in the |sizes| parameter, so we return zero
// here to the hashtable enumerator.
return 0;
}
void
gfxFontCache::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
// TODO: add the overhead of the expiration tracker (generation arrays)
aSizes->mFontInstances +=
mFonts.SizeOfExcludingThis(AddSizeOfFontEntryExcludingThis,
aMallocSizeOf, aSizes);
}
void
gfxFontCache::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
aSizes->mFontInstances += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
#define MAX_SSXX_VALUE 99
#define MAX_CVXX_VALUE 99
static void
LookupAlternateValues(gfxFontFeatureValueSet *featureLookup,
const nsAString& aFamily,
const nsTArray<gfxAlternateValue>& altValue,
nsTArray<gfxFontFeature>& aFontFeatures)
{
uint32_t numAlternates = altValue.Length();
for (uint32_t i = 0; i < numAlternates; i++) {
const gfxAlternateValue& av = altValue.ElementAt(i);
nsAutoTArray<uint32_t,4> values;
// map <family, name, feature> ==> <values>
bool found =
featureLookup->GetFontFeatureValuesFor(aFamily, av.alternate,
av.value, values);
uint32_t numValues = values.Length();
// nothing defined, skip
if (!found || numValues == 0) {
continue;
}
gfxFontFeature feature;
if (av.alternate == NS_FONT_VARIANT_ALTERNATES_CHARACTER_VARIANT) {
NS_ASSERTION(numValues <= 2,
"too many values allowed for character-variant");
// character-variant(12 3) ==> 'cv12' = 3
uint32_t nn = values.ElementAt(0);
// ignore values greater than 99
if (nn == 0 || nn > MAX_CVXX_VALUE) {
continue;
}
feature.mValue = 1;
if (numValues > 1) {
feature.mValue = values.ElementAt(1);
}
feature.mTag = HB_TAG('c','v',('0' + nn / 10), ('0' + nn % 10));
aFontFeatures.AppendElement(feature);
} else if (av.alternate == NS_FONT_VARIANT_ALTERNATES_STYLESET) {
// styleset(1 2 7) ==> 'ss01' = 1, 'ss02' = 1, 'ss07' = 1
feature.mValue = 1;
for (uint32_t v = 0; v < numValues; v++) {
uint32_t nn = values.ElementAt(v);
if (nn == 0 || nn > MAX_SSXX_VALUE) {
continue;
}
feature.mTag = HB_TAG('s','s',('0' + nn / 10), ('0' + nn % 10));
aFontFeatures.AppendElement(feature);
}
} else {
NS_ASSERTION(numValues == 1,
"too many values for font-specific font-variant-alternates");
feature.mValue = values.ElementAt(0);
switch (av.alternate) {
case NS_FONT_VARIANT_ALTERNATES_STYLISTIC: // salt
feature.mTag = HB_TAG('s','a','l','t');
break;
case NS_FONT_VARIANT_ALTERNATES_SWASH: // swsh, cswh
feature.mTag = HB_TAG('s','w','s','h');
aFontFeatures.AppendElement(feature);
feature.mTag = HB_TAG('c','s','w','h');
break;
case NS_FONT_VARIANT_ALTERNATES_ORNAMENTS: // ornm
feature.mTag = HB_TAG('o','r','n','m');
break;
case NS_FONT_VARIANT_ALTERNATES_ANNOTATION: // nalt
feature.mTag = HB_TAG('n','a','l','t');
break;
default:
feature.mTag = 0;
break;
}
NS_ASSERTION(feature.mTag, "unsupported alternate type");
if (!feature.mTag) {
continue;
}
aFontFeatures.AppendElement(feature);
}
}
}
/* static */ bool
gfxFontShaper::MergeFontFeatures(
const gfxFontStyle *aStyle,
const nsTArray<gfxFontFeature>& aFontFeatures,
bool aDisableLigatures,
const nsAString& aFamilyName,
nsDataHashtable<nsUint32HashKey,uint32_t>& aMergedFeatures)
{
uint32_t numAlts = aStyle->alternateValues.Length();
const nsTArray<gfxFontFeature>& styleRuleFeatures =
aStyle->featureSettings;
// bail immediately if nothing to do
if (styleRuleFeatures.IsEmpty() &&
aFontFeatures.IsEmpty() &&
!aDisableLigatures &&
numAlts == 0) {
return false;
}
// Ligature features are enabled by default in the generic shaper,
// so we explicitly turn them off if necessary (for letter-spacing)
if (aDisableLigatures) {
aMergedFeatures.Put(HB_TAG('l','i','g','a'), 0);
aMergedFeatures.Put(HB_TAG('c','l','i','g'), 0);
}
// add feature values from font
uint32_t i, count;
count = aFontFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = aFontFeatures.ElementAt(i);
aMergedFeatures.Put(feature.mTag, feature.mValue);
}
// add font-specific feature values from style rules
if (aStyle->featureValueLookup && numAlts > 0) {
nsAutoTArray<gfxFontFeature,4> featureList;
// insert list of alternate feature settings
LookupAlternateValues(aStyle->featureValueLookup, aFamilyName,
aStyle->alternateValues, featureList);
count = featureList.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = featureList.ElementAt(i);
aMergedFeatures.Put(feature.mTag, feature.mValue);
}
}
// add feature values from style rules
count = styleRuleFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = styleRuleFeatures.ElementAt(i);
aMergedFeatures.Put(feature.mTag, feature.mValue);
}
return aMergedFeatures.Count() != 0;
}
void
gfxFont::RunMetrics::CombineWith(const RunMetrics& aOther, bool aOtherIsOnLeft)
{
mAscent = std::max(mAscent, aOther.mAscent);
mDescent = std::max(mDescent, aOther.mDescent);
if (aOtherIsOnLeft) {
mBoundingBox =
(mBoundingBox + gfxPoint(aOther.mAdvanceWidth, 0)).Union(aOther.mBoundingBox);
} else {
mBoundingBox =
mBoundingBox.Union(aOther.mBoundingBox + gfxPoint(mAdvanceWidth, 0));
}
mAdvanceWidth += aOther.mAdvanceWidth;
}
gfxFont::gfxFont(gfxFontEntry *aFontEntry, const gfxFontStyle *aFontStyle,
AntialiasOption anAAOption, cairo_scaled_font_t *aScaledFont) :
mScaledFont(aScaledFont),
mFontEntry(aFontEntry), mIsValid(true),
mApplySyntheticBold(false),
mStyle(*aFontStyle),
mAdjustedSize(0.0),
mFUnitsConvFactor(0.0f),
mAntialiasOption(anAAOption)
{
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gFontCount;
#endif
mKerningSet = HasFeatureSet(HB_TAG('k','e','r','n'), mKerningEnabled);
}
static PLDHashOperator
NotifyFontDestroyed(nsPtrHashKey<gfxFont::GlyphChangeObserver>* aKey,
void* aClosure)
{
aKey->GetKey()->ForgetFont();
return PL_DHASH_NEXT;
}
gfxFont::~gfxFont()
{
uint32_t i, count = mGlyphExtentsArray.Length();
// We destroy the contents of mGlyphExtentsArray explicitly instead of
// using nsAutoPtr because VC++ can't deal with nsTArrays of nsAutoPtrs
// of classes that lack a proper copy constructor
for (i = 0; i < count; ++i) {
delete mGlyphExtentsArray[i];
}
mFontEntry->NotifyFontDestroyed(this);
if (mGlyphChangeObservers) {
mGlyphChangeObservers->EnumerateEntries(NotifyFontDestroyed, nullptr);
}
}
/*static*/
PLDHashOperator
gfxFont::AgeCacheEntry(CacheHashEntry *aEntry, void *aUserData)
{
if (!aEntry->mShapedWord) {
NS_ASSERTION(aEntry->mShapedWord, "cache entry has no gfxShapedWord!");
return PL_DHASH_REMOVE;
}
if (aEntry->mShapedWord->IncrementAge() == kShapedWordCacheMaxAge) {
return PL_DHASH_REMOVE;
}
return PL_DHASH_NEXT;
}
static void
CollectLookupsByFeature(hb_face_t *aFace, hb_tag_t aTableTag,
uint32_t aFeatureIndex, hb_set_t *aLookups)
{
uint32_t lookups[32];
uint32_t i, len, offset;
offset = 0;
do {
len = ArrayLength(lookups);
hb_ot_layout_feature_get_lookups(aFace, aTableTag, aFeatureIndex,
offset, &len, lookups);
for (i = 0; i < len; i++) {
hb_set_add(aLookups, lookups[i]);
}
offset += len;
} while (len == ArrayLength(lookups));
}
static void
CollectLookupsByLanguage(hb_face_t *aFace, hb_tag_t aTableTag,
const nsTHashtable<nsUint32HashKey>&
aSpecificFeatures,
hb_set_t *aOtherLookups,
hb_set_t *aSpecificFeatureLookups,
uint32_t aScriptIndex, uint32_t aLangIndex)
{
uint32_t reqFeatureIndex;
if (hb_ot_layout_language_get_required_feature_index(aFace, aTableTag,
aScriptIndex,
aLangIndex,
&reqFeatureIndex)) {
CollectLookupsByFeature(aFace, aTableTag, reqFeatureIndex,
aOtherLookups);
}
uint32_t featureIndexes[32];
uint32_t i, len, offset;
offset = 0;
do {
len = ArrayLength(featureIndexes);
hb_ot_layout_language_get_feature_indexes(aFace, aTableTag,
aScriptIndex, aLangIndex,
offset, &len, featureIndexes);
for (i = 0; i < len; i++) {
uint32_t featureIndex = featureIndexes[i];
// get the feature tag
hb_tag_t featureTag;
uint32_t tagLen = 1;
hb_ot_layout_language_get_feature_tags(aFace, aTableTag,
aScriptIndex, aLangIndex,
offset + i, &tagLen,
&featureTag);
// collect lookups
hb_set_t *lookups = aSpecificFeatures.GetEntry(featureTag) ?
aSpecificFeatureLookups : aOtherLookups;
CollectLookupsByFeature(aFace, aTableTag, featureIndex, lookups);
}
offset += len;
} while (len == ArrayLength(featureIndexes));
}
static bool
HasLookupRuleWithGlyphByScript(hb_face_t *aFace, hb_tag_t aTableTag,
hb_tag_t aScriptTag, uint32_t aScriptIndex,
uint16_t aGlyph,
const nsTHashtable<nsUint32HashKey>&
aDefaultFeatures,
bool& aHasDefaultFeatureWithGlyph)
{
uint32_t numLangs, lang;
hb_set_t *defaultFeatureLookups = hb_set_create();
hb_set_t *nonDefaultFeatureLookups = hb_set_create();
// default lang
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
nonDefaultFeatureLookups, defaultFeatureLookups,
aScriptIndex,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
// iterate over langs
numLangs = hb_ot_layout_script_get_language_tags(aFace, aTableTag,
aScriptIndex, 0,
nullptr, nullptr);
for (lang = 0; lang < numLangs; lang++) {
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
nonDefaultFeatureLookups,
defaultFeatureLookups,
aScriptIndex, lang);
}
// look for the glyph among default feature lookups
aHasDefaultFeatureWithGlyph = false;
hb_set_t *glyphs = hb_set_create();
hb_codepoint_t index = -1;
while (hb_set_next(defaultFeatureLookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
glyphs, glyphs, glyphs,
glyphs);
if (hb_set_has(glyphs, aGlyph)) {
aHasDefaultFeatureWithGlyph = true;
break;
}
}
// look for the glyph among non-default feature lookups
// if no default feature lookups contained spaces
bool hasNonDefaultFeatureWithGlyph = false;
if (!aHasDefaultFeatureWithGlyph) {
hb_set_clear(glyphs);
index = -1;
while (hb_set_next(nonDefaultFeatureLookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
glyphs, glyphs, glyphs,
glyphs);
if (hb_set_has(glyphs, aGlyph)) {
hasNonDefaultFeatureWithGlyph = true;
break;
}
}
}
hb_set_destroy(glyphs);
hb_set_destroy(defaultFeatureLookups);
hb_set_destroy(nonDefaultFeatureLookups);
return aHasDefaultFeatureWithGlyph || hasNonDefaultFeatureWithGlyph;
}
static void
HasLookupRuleWithGlyph(hb_face_t *aFace, hb_tag_t aTableTag, bool& aHasGlyph,
hb_tag_t aSpecificFeature, bool& aHasGlyphSpecific,
uint16_t aGlyph)
{
// iterate over the scripts in the font
uint32_t numScripts, numLangs, script, lang;
hb_set_t *otherLookups = hb_set_create();
hb_set_t *specificFeatureLookups = hb_set_create();
nsTHashtable<nsUint32HashKey> specificFeature;
specificFeature.PutEntry(aSpecificFeature);
numScripts = hb_ot_layout_table_get_script_tags(aFace, aTableTag, 0,
nullptr, nullptr);
for (script = 0; script < numScripts; script++) {
// default lang
CollectLookupsByLanguage(aFace, aTableTag, specificFeature,
otherLookups, specificFeatureLookups,
script, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
// iterate over langs
numLangs = hb_ot_layout_script_get_language_tags(aFace, HB_OT_TAG_GPOS,
script, 0,
nullptr, nullptr);
for (lang = 0; lang < numLangs; lang++) {
CollectLookupsByLanguage(aFace, aTableTag, specificFeature,
otherLookups, specificFeatureLookups,
script, lang);
}
}
// look for the glyph among non-specific feature lookups
hb_set_t *glyphs = hb_set_create();
hb_codepoint_t index = -1;
while (hb_set_next(otherLookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
glyphs, glyphs, glyphs,
glyphs);
if (hb_set_has(glyphs, aGlyph)) {
aHasGlyph = true;
break;
}
}
// look for the glyph among specific feature lookups
hb_set_clear(glyphs);
index = -1;
while (hb_set_next(specificFeatureLookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index,
glyphs, glyphs, glyphs,
glyphs);
if (hb_set_has(glyphs, aGlyph)) {
aHasGlyphSpecific = true;
break;
}
}
hb_set_destroy(glyphs);
hb_set_destroy(specificFeatureLookups);
hb_set_destroy(otherLookups);
}
nsDataHashtable<nsUint32HashKey, int32_t> *gfxFont::sScriptTagToCode = nullptr;
nsTHashtable<nsUint32HashKey> *gfxFont::sDefaultFeatures = nullptr;
static inline bool
HasSubstitution(uint32_t *aBitVector, uint32_t aBit) {
return (aBitVector[aBit >> 5] & (1 << (aBit & 0x1f))) != 0;
}
// union of all default substitution features across scripts
static const hb_tag_t defaultFeatures[] = {
HB_TAG('a','b','v','f'),
HB_TAG('a','b','v','s'),
HB_TAG('a','k','h','n'),
HB_TAG('b','l','w','f'),
HB_TAG('b','l','w','s'),
HB_TAG('c','a','l','t'),
HB_TAG('c','c','m','p'),
HB_TAG('c','f','a','r'),
HB_TAG('c','j','c','t'),
HB_TAG('c','l','i','g'),
HB_TAG('f','i','n','2'),
HB_TAG('f','i','n','3'),
HB_TAG('f','i','n','a'),
HB_TAG('h','a','l','f'),
HB_TAG('h','a','l','n'),
HB_TAG('i','n','i','t'),
HB_TAG('i','s','o','l'),
HB_TAG('l','i','g','a'),
HB_TAG('l','j','m','o'),
HB_TAG('l','o','c','l'),
HB_TAG('l','t','r','a'),
HB_TAG('l','t','r','m'),
HB_TAG('m','e','d','2'),
HB_TAG('m','e','d','i'),
HB_TAG('m','s','e','t'),
HB_TAG('n','u','k','t'),
HB_TAG('p','r','e','f'),
HB_TAG('p','r','e','s'),
HB_TAG('p','s','t','f'),
HB_TAG('p','s','t','s'),
HB_TAG('r','c','l','t'),
HB_TAG('r','l','i','g'),
HB_TAG('r','k','r','f'),
HB_TAG('r','p','h','f'),
HB_TAG('r','t','l','a'),
HB_TAG('r','t','l','m'),
HB_TAG('t','j','m','o'),
HB_TAG('v','a','t','u'),
HB_TAG('v','e','r','t'),
HB_TAG('v','j','m','o')
};
void
gfxFont::CheckForFeaturesInvolvingSpace()
{
mFontEntry->mHasSpaceFeaturesInitialized = true;
#ifdef PR_LOGGING
bool log = LOG_FONTINIT_ENABLED();
TimeStamp start;
if (MOZ_UNLIKELY(log)) {
start = TimeStamp::Now();
}
#endif
bool result = false;
uint32_t spaceGlyph = GetSpaceGlyph();
if (!spaceGlyph) {
return;
}
hb_face_t *face = GetFontEntry()->GetHBFace();
// GSUB lookups - examine per script
if (hb_ot_layout_has_substitution(face)) {
// set up the script ==> code hashtable if needed
if (!sScriptTagToCode) {
sScriptTagToCode =
new nsDataHashtable<nsUint32HashKey,
int32_t>(MOZ_NUM_SCRIPT_CODES);
sScriptTagToCode->Put(HB_TAG('D','F','L','T'), MOZ_SCRIPT_COMMON);
for (int32_t s = MOZ_SCRIPT_ARABIC; s < MOZ_NUM_SCRIPT_CODES; s++) {
hb_script_t scriptTag = hb_script_t(GetScriptTagForCode(s));
hb_tag_t s1, s2;
hb_ot_tags_from_script(scriptTag, &s1, &s2);
sScriptTagToCode->Put(s1, s);
if (s2 != HB_OT_TAG_DEFAULT_SCRIPT) {
sScriptTagToCode->Put(s2, s);
}
}
uint32_t numDefaultFeatures = ArrayLength(defaultFeatures);
sDefaultFeatures =
new nsTHashtable<nsUint32HashKey>(numDefaultFeatures);
for (uint32_t i = 0; i < numDefaultFeatures; i++) {
sDefaultFeatures->PutEntry(defaultFeatures[i]);
}
}
// iterate over the scripts in the font
hb_tag_t scriptTags[8];
uint32_t len, offset = 0;
do {
len = ArrayLength(scriptTags);
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, offset,
&len, scriptTags);
for (uint32_t i = 0; i < len; i++) {
bool isDefaultFeature = false;
int32_t s;
if (!HasLookupRuleWithGlyphByScript(face, HB_OT_TAG_GSUB,
scriptTags[i], offset + i,
spaceGlyph,
*sDefaultFeatures,
isDefaultFeature) ||
!sScriptTagToCode->Get(scriptTags[i], &s))
{
continue;
}
result = true;
uint32_t index = s >> 5;
uint32_t bit = s & 0x1f;
if (isDefaultFeature) {
mFontEntry->mDefaultSubSpaceFeatures[index] |= (1 << bit);
} else {
mFontEntry->mNonDefaultSubSpaceFeatures[index] |= (1 << bit);
}
}
offset += len;
} while (len == ArrayLength(scriptTags));
}
// spaces in default features of default script?
// ==> can't use word cache, skip GPOS analysis
bool canUseWordCache = true;
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
MOZ_SCRIPT_COMMON)) {
canUseWordCache = false;
}
// GPOS lookups - distinguish kerning from non-kerning features
mFontEntry->mHasSpaceFeaturesKerning = false;
mFontEntry->mHasSpaceFeaturesNonKerning = false;
if (canUseWordCache && hb_ot_layout_has_positioning(face)) {
bool hasKerning = false, hasNonKerning = false;
HasLookupRuleWithGlyph(face, HB_OT_TAG_GPOS, hasNonKerning,
HB_TAG('k','e','r','n'), hasKerning, spaceGlyph);
if (hasKerning || hasNonKerning) {
result = true;
}
mFontEntry->mHasSpaceFeaturesKerning = hasKerning;
mFontEntry->mHasSpaceFeaturesNonKerning = hasNonKerning;
}
hb_face_destroy(face);
mFontEntry->mHasSpaceFeatures = result;
#ifdef PR_LOGGING
if (MOZ_UNLIKELY(log)) {
TimeDuration elapsed = TimeStamp::Now() - start;
LOG_FONTINIT((
"(fontinit-spacelookups) font: %s - "
"subst default: %8.8x %8.8x %8.8x %8.8x "
"subst non-default: %8.8x %8.8x %8.8x %8.8x "
"kerning: %s non-kerning: %s time: %6.3f\n",
NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
mFontEntry->mDefaultSubSpaceFeatures[3],
mFontEntry->mDefaultSubSpaceFeatures[2],
mFontEntry->mDefaultSubSpaceFeatures[1],
mFontEntry->mDefaultSubSpaceFeatures[0],
mFontEntry->mNonDefaultSubSpaceFeatures[3],
mFontEntry->mNonDefaultSubSpaceFeatures[2],
mFontEntry->mNonDefaultSubSpaceFeatures[1],
mFontEntry->mNonDefaultSubSpaceFeatures[0],
(mFontEntry->mHasSpaceFeaturesKerning ? "true" : "false"),
(mFontEntry->mHasSpaceFeaturesNonKerning ? "true" : "false"),
elapsed.ToMilliseconds()
));
}
#endif
}
bool
gfxFont::HasSubstitutionRulesWithSpaceLookups(int32_t aRunScript)
{
NS_ASSERTION(GetFontEntry()->mHasSpaceFeaturesInitialized,
"need to initialize space lookup flags");
NS_ASSERTION(aRunScript < MOZ_NUM_SCRIPT_CODES, "weird script code");
if (aRunScript == MOZ_SCRIPT_INVALID ||
aRunScript >= MOZ_NUM_SCRIPT_CODES) {
return false;
}
// default features have space lookups ==> true
if (HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
MOZ_SCRIPT_COMMON) ||
HasSubstitution(mFontEntry->mDefaultSubSpaceFeatures,
aRunScript))
{
return true;
}
// non-default features have space lookups and some type of
// font feature, in font or style is specified ==> true
if ((HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures,
MOZ_SCRIPT_COMMON) ||
HasSubstitution(mFontEntry->mNonDefaultSubSpaceFeatures,
aRunScript)) &&
(!mStyle.featureSettings.IsEmpty() ||
!mFontEntry->mFeatureSettings.IsEmpty()))
{
return true;
}
return false;
}
bool
gfxFont::SpaceMayParticipateInShaping(int32_t aRunScript)
{
// avoid checking fonts known not to include default space-dependent features
if (MOZ_UNLIKELY(mFontEntry->mSkipDefaultFeatureSpaceCheck)) {
if (!mKerningSet && mStyle.featureSettings.IsEmpty() &&
mFontEntry->mFeatureSettings.IsEmpty()) {
return false;
}
}
// We record the presence of space-dependent features in the font entry
// so that subsequent instantiations for the same font face won't
// require us to re-check the tables; however, the actual check is done
// by gfxFont because not all font entry subclasses know how to create
// a harfbuzz face for introspection.
if (!mFontEntry->mHasSpaceFeaturesInitialized) {
CheckForFeaturesInvolvingSpace();
}
if (!mFontEntry->mHasSpaceFeatures) {
return false;
}
// if font has substitution rules or non-kerning positioning rules
// that involve spaces, bypass
if (HasSubstitutionRulesWithSpaceLookups(aRunScript) ||
mFontEntry->mHasSpaceFeaturesNonKerning) {
return true;
}
// if kerning explicitly enabled/disabled via font-feature-settings or
// font-kerning and kerning rules use spaces, only bypass when enabled
if (mKerningSet && mFontEntry->mHasSpaceFeaturesKerning) {
return mKerningEnabled;
}
return false;
}
bool
gfxFont::HasFeatureSet(uint32_t aFeature, bool& aFeatureOn)
{
aFeatureOn = false;
if (mStyle.featureSettings.IsEmpty() &&
GetFontEntry()->mFeatureSettings.IsEmpty()) {
return false;
}
// add feature values from font
bool featureSet = false;
uint32_t i, count;
nsTArray<gfxFontFeature>& fontFeatures = GetFontEntry()->mFeatureSettings;
count = fontFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = fontFeatures.ElementAt(i);
if (feature.mTag == aFeature) {
featureSet = true;
aFeatureOn = (feature.mValue != 0);
}
}
// add feature values from style rules
nsTArray<gfxFontFeature>& styleFeatures = mStyle.featureSettings;
count = styleFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = styleFeatures.ElementAt(i);
if (feature.mTag == aFeature) {
featureSet = true;
aFeatureOn = (feature.mValue != 0);
}
}
return featureSet;
}
/**
* A helper function in case we need to do any rounding or other
* processing here.
*/
#define ToDeviceUnits(aAppUnits, aDevUnitsPerAppUnit) \
(double(aAppUnits)*double(aDevUnitsPerAppUnit))
struct GlyphBuffer {
#define GLYPH_BUFFER_SIZE (2048/sizeof(cairo_glyph_t))
cairo_glyph_t mGlyphBuffer[GLYPH_BUFFER_SIZE];
unsigned int mNumGlyphs;
GlyphBuffer()
: mNumGlyphs(0) { }
cairo_glyph_t *AppendGlyph() {
return &mGlyphBuffer[mNumGlyphs++];
}
void Flush(cairo_t *aCR, DrawMode aDrawMode, bool aReverse,
gfxTextContextPaint *aContextPaint,
const gfxMatrix& aGlobalMatrix, bool aFinish = false) {
// Ensure there's enough room for a glyph to be added to the buffer
// and we actually have glyphs to draw
if ((!aFinish && mNumGlyphs < GLYPH_BUFFER_SIZE) || !mNumGlyphs) {
return;
}
if (aReverse) {
for (uint32_t i = 0; i < mNumGlyphs/2; ++i) {
cairo_glyph_t tmp = mGlyphBuffer[i];
mGlyphBuffer[i] = mGlyphBuffer[mNumGlyphs - 1 - i];
mGlyphBuffer[mNumGlyphs - 1 - i] = tmp;
}
}
if (aDrawMode == DrawMode::GLYPH_PATH) {
cairo_glyph_path(aCR, mGlyphBuffer, mNumGlyphs);
} else {
if ((int(aDrawMode) & (int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) ==
(int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) {
FlushStroke(aCR, aContextPaint, aGlobalMatrix);
}
if (int(aDrawMode) & int(DrawMode::GLYPH_FILL)) {
PROFILER_LABEL("GlyphBuffer", "cairo_show_glyphs");
nsRefPtr<gfxPattern> pattern;
if (aContextPaint &&
!!(pattern = aContextPaint->GetFillPattern(aGlobalMatrix))) {
cairo_save(aCR);
cairo_set_source(aCR, pattern->CairoPattern());
}
cairo_show_glyphs(aCR, mGlyphBuffer, mNumGlyphs);
if (pattern) {
cairo_restore(aCR);
}
}
if ((int(aDrawMode) & (int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) ==
int(DrawMode::GLYPH_STROKE)) {
FlushStroke(aCR, aContextPaint, aGlobalMatrix);
}
}
mNumGlyphs = 0;
}
private:
void FlushStroke(cairo_t *aCR, gfxTextContextPaint *aContextPaint,
const gfxMatrix& aGlobalMatrix) {
nsRefPtr<gfxPattern> pattern;
if (aContextPaint &&
!!(pattern = aContextPaint->GetStrokePattern(aGlobalMatrix))) {
cairo_save(aCR);
cairo_set_source(aCR, pattern->CairoPattern());
}
cairo_new_path(aCR);
cairo_glyph_path(aCR, mGlyphBuffer, mNumGlyphs);
cairo_stroke(aCR);
if (pattern) {
cairo_restore(aCR);
}
}
#undef GLYPH_BUFFER_SIZE
};
static AntialiasMode Get2DAAMode(gfxFont::AntialiasOption aAAOption) {
switch (aAAOption) {
case gfxFont::kAntialiasSubpixel:
return AntialiasMode::SUBPIXEL;
case gfxFont::kAntialiasGrayscale:
return AntialiasMode::GRAY;
case gfxFont::kAntialiasNone:
return AntialiasMode::NONE;
default:
return AntialiasMode::DEFAULT;
}
}
struct GlyphBufferAzure {
#define GLYPH_BUFFER_SIZE (2048/sizeof(Glyph))
Glyph mGlyphBuffer[GLYPH_BUFFER_SIZE];
unsigned int mNumGlyphs;
GlyphBufferAzure()
: mNumGlyphs(0) { }
Glyph *AppendGlyph() {
return &mGlyphBuffer[mNumGlyphs++];
}
void Flush(DrawTarget *aDT, gfxTextContextPaint *aContextPaint, ScaledFont *aFont,
DrawMode aDrawMode, bool aReverse, const GlyphRenderingOptions *aOptions,
gfxContext *aThebesContext, const Matrix *aInvFontMatrix, const DrawOptions &aDrawOptions,
bool aFinish = false)
{
// Ensure there's enough room for a glyph to be added to the buffer
if ((!aFinish && mNumGlyphs < GLYPH_BUFFER_SIZE) || !mNumGlyphs) {
return;
}
if (aReverse) {
Glyph *begin = &mGlyphBuffer[0];
Glyph *end = &mGlyphBuffer[mNumGlyphs];
std::reverse(begin, end);
}
gfx::GlyphBuffer buf;
buf.mGlyphs = mGlyphBuffer;
buf.mNumGlyphs = mNumGlyphs;
gfxContext::AzureState state = aThebesContext->CurrentState();
if ((int(aDrawMode) & (int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) ==
(int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) {
FlushStroke(aDT, aContextPaint, aFont, aThebesContext, buf, state);
}
if (int(aDrawMode) & int(DrawMode::GLYPH_FILL)) {
if (state.pattern || aContextPaint) {
Pattern *pat;
nsRefPtr<gfxPattern> fillPattern;
if (!aContextPaint ||
!(fillPattern = aContextPaint->GetFillPattern(aThebesContext->CurrentMatrix()))) {
if (state.pattern) {
pat = state.pattern->GetPattern(aDT, state.patternTransformChanged ? &state.patternTransform : nullptr);
} else {
pat = nullptr;
}
} else {
pat = fillPattern->GetPattern(aDT);
}
if (pat) {
Matrix saved;
Matrix *mat = nullptr;
if (aInvFontMatrix) {
// The brush matrix needs to be multiplied with the inverted matrix
// as well, to move the brush into the space of the glyphs. Before
// the render target transformation
// This relies on the returned Pattern not to be reused by
// others, but regenerated on GetPattern calls. This is true!
if (pat->GetType() == PatternType::LINEAR_GRADIENT) {
mat = &static_cast<LinearGradientPattern*>(pat)->mMatrix;
} else if (pat->GetType() == PatternType::RADIAL_GRADIENT) {
mat = &static_cast<RadialGradientPattern*>(pat)->mMatrix;
} else if (pat->GetType() == PatternType::SURFACE) {
mat = &static_cast<SurfacePattern*>(pat)->mMatrix;
}
if (mat) {
saved = *mat;
*mat = (*mat) * (*aInvFontMatrix);
}
}
aDT->FillGlyphs(aFont, buf, *pat,
aDrawOptions, aOptions);
if (mat) {
*mat = saved;
}
}
} else if (state.sourceSurface) {
aDT->FillGlyphs(aFont, buf, SurfacePattern(state.sourceSurface,
ExtendMode::CLAMP,
state.surfTransform),
aDrawOptions, aOptions);
} else {
aDT->FillGlyphs(aFont, buf, ColorPattern(state.color),
aDrawOptions, aOptions);
}
}
if (int(aDrawMode) & int(DrawMode::GLYPH_PATH)) {
aThebesContext->EnsurePathBuilder();
Matrix mat = aDT->GetTransform();
aFont->CopyGlyphsToBuilder(buf, aThebesContext->mPathBuilder, aDT->GetType(), &mat);
}
if ((int(aDrawMode) & (int(DrawMode::GLYPH_STROKE) | int(DrawMode::GLYPH_STROKE_UNDERNEATH))) ==
int(DrawMode::GLYPH_STROKE)) {
FlushStroke(aDT, aContextPaint, aFont, aThebesContext, buf, state);
}
mNumGlyphs = 0;
}
private:
void FlushStroke(DrawTarget *aDT, gfxTextContextPaint *aContextPaint,
ScaledFont *aFont, gfxContext *aThebesContext,
gfx::GlyphBuffer& aBuf, gfxContext::AzureState& aState)
{
RefPtr<Path> path = aFont->GetPathForGlyphs(aBuf, aDT);
if (aContextPaint) {
nsRefPtr<gfxPattern> strokePattern =
aContextPaint->GetStrokePattern(aThebesContext->CurrentMatrix());
if (strokePattern) {
aDT->Stroke(path, *strokePattern->GetPattern(aDT), aState.strokeOptions);
}
}
}
#undef GLYPH_BUFFER_SIZE
};
// Bug 674909. When synthetic bolding text by drawing twice, need to
// render using a pixel offset in device pixels, otherwise text
// doesn't appear bolded, it appears as if a bad text shadow exists
// when a non-identity transform exists. Use an offset factor so that
// the second draw occurs at a constant offset in device pixels.
double
gfxFont::CalcXScale(gfxContext *aContext)
{
// determine magnitude of a 1px x offset in device space
gfxSize t = aContext->UserToDevice(gfxSize(1.0, 0.0));
if (t.width == 1.0 && t.height == 0.0) {
// short-circuit the most common case to avoid sqrt() and division
return 1.0;
}
double m = sqrt(t.width * t.width + t.height * t.height);
NS_ASSERTION(m != 0.0, "degenerate transform while synthetic bolding");
if (m == 0.0) {
return 0.0; // effectively disables offset
}
// scale factor so that offsets are 1px in device pixels
return 1.0 / m;
}
static DrawMode
ForcePaintingDrawMode(DrawMode aDrawMode)
{
return aDrawMode == DrawMode::GLYPH_PATH ?
DrawMode(int(DrawMode::GLYPH_FILL) | int(DrawMode::GLYPH_STROKE)) :
aDrawMode;
}
void
gfxFont::Draw(gfxTextRun *aTextRun, uint32_t aStart, uint32_t aEnd,
gfxContext *aContext, DrawMode aDrawMode, gfxPoint *aPt,
Spacing *aSpacing, gfxTextContextPaint *aContextPaint,
gfxTextRunDrawCallbacks *aCallbacks)
{
NS_ASSERTION(aDrawMode == DrawMode::GLYPH_PATH || !(int(aDrawMode) & int(DrawMode::GLYPH_PATH)),
"GLYPH_PATH cannot be used with GLYPH_FILL, GLYPH_STROKE or GLYPH_STROKE_UNDERNEATH");
if (aStart >= aEnd)
return;
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
const int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
const double devUnitsPerAppUnit = 1.0/double(appUnitsPerDevUnit);
bool isRTL = aTextRun->IsRightToLeft();
double direction = aTextRun->GetDirection();
gfxMatrix globalMatrix = aContext->CurrentMatrix();
bool haveSVGGlyphs = GetFontEntry()->TryGetSVGData(this);
nsAutoPtr<gfxTextContextPaint> contextPaint;
if (haveSVGGlyphs && !aContextPaint) {
// If no pattern is specified for fill, use the current pattern
NS_ASSERTION((int(aDrawMode) & int(DrawMode::GLYPH_STROKE)) == 0, "no pattern supplied for stroking text");
nsRefPtr<gfxPattern> fillPattern = aContext->GetPattern();
contextPaint = new SimpleTextContextPaint(fillPattern, nullptr,
aContext->CurrentMatrix());
aContextPaint = contextPaint;
}
// synthetic-bold strikes are each offset one device pixel in run direction
// (these values are only needed if IsSyntheticBold() is true)
double synBoldOnePixelOffset = 0;
int32_t strikes = 1;
if (IsSyntheticBold()) {
double xscale = CalcXScale(aContext);
synBoldOnePixelOffset = direction * xscale;
if (xscale != 0.0) {
// use as many strikes as needed for the the increased advance
strikes = NS_lroundf(GetSyntheticBoldOffset() / xscale);
}
}
uint32_t i;
// Current position in appunits
double x = aPt->x;
double y = aPt->y;
cairo_t *cr = aContext->GetCairo();
RefPtr<DrawTarget> dt = aContext->GetDrawTarget();
bool paintSVGGlyphs = !aCallbacks || aCallbacks->mShouldPaintSVGGlyphs;
bool emittedGlyphs = false;
if (aContext->IsCairo()) {
bool success = SetupCairoFont(aContext);
if (MOZ_UNLIKELY(!success))
return;
::GlyphBuffer glyphs;
cairo_glyph_t *glyph;
if (aSpacing) {
x += direction*aSpacing[0].mBefore;
}
for (i = aStart; i < aEnd; ++i) {
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[i];
if (glyphData->IsSimpleGlyph()) {
double advance = glyphData->GetSimpleAdvance();
double glyphX;
if (isRTL) {
x -= advance;
glyphX = x;
} else {
glyphX = x;
x += advance;
}
if (haveSVGGlyphs) {
if (!paintSVGGlyphs) {
continue;
}
gfxPoint point(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
DrawMode mode = ForcePaintingDrawMode(aDrawMode);
if (RenderSVGGlyph(aContext, point, mode,
glyphData->GetSimpleGlyph(), aContextPaint,
aCallbacks, emittedGlyphs)) {
continue;
}
}
// Perhaps we should put a scale in the cairo context instead of
// doing this scaling here...
// Multiplying by the reciprocal may introduce tiny error here,
// but we assume cairo is going to round coordinates at some stage
// and this is faster
glyph = glyphs.AppendGlyph();
glyph->index = glyphData->GetSimpleGlyph();
glyph->x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->y = ToDeviceUnits(y, devUnitsPerAppUnit);
glyphs.Flush(cr, aDrawMode, isRTL, aContextPaint, globalMatrix);
// synthetic bolding by multi-striking with 1-pixel offsets
// at least once, more if there's room (large font sizes)
if (IsSyntheticBold()) {
double strikeOffset = synBoldOnePixelOffset;
int32_t strikeCount = strikes;
do {
cairo_glyph_t *doubleglyph;
doubleglyph = glyphs.AppendGlyph();
doubleglyph->index = glyph->index;
doubleglyph->x =
ToDeviceUnits(glyphX + strikeOffset * appUnitsPerDevUnit,
devUnitsPerAppUnit);
doubleglyph->y = glyph->y;
strikeOffset += synBoldOnePixelOffset;
glyphs.Flush(cr, aDrawMode, isRTL, aContextPaint, globalMatrix);
} while (--strikeCount > 0);
}
emittedGlyphs = true;
} else {
uint32_t glyphCount = glyphData->GetGlyphCount();
if (glyphCount > 0) {
const gfxTextRun::DetailedGlyph *details =
aTextRun->GetDetailedGlyphs(i);
NS_ASSERTION(details, "detailedGlyph should not be missing!");
double advance;
for (uint32_t j = 0; j < glyphCount; ++j, ++details, x += direction * advance) {
advance = details->mAdvance;
if (glyphData->IsMissing()) {
// default ignorable characters will have zero advance width.
// we don't have to draw the hexbox for them
if (aDrawMode != DrawMode::GLYPH_PATH && advance > 0) {
double glyphX = x;
if (isRTL) {
glyphX -= advance;
}
gfxPoint pt(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
gfxFloat advanceDevUnits = ToDeviceUnits(advance, devUnitsPerAppUnit);
gfxFloat height = GetMetrics().maxAscent;
gfxRect glyphRect(pt.x, pt.y - height, advanceDevUnits, height);
gfxFontMissingGlyphs::DrawMissingGlyph(aContext,
glyphRect,
details->mGlyphID,
appUnitsPerDevUnit);
}
} else {
double glyphX = x + details->mXOffset;
if (isRTL) {
glyphX -= advance;
}
gfxPoint point(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
if (haveSVGGlyphs) {
if (!paintSVGGlyphs) {
continue;
}
DrawMode mode = ForcePaintingDrawMode(aDrawMode);
if (RenderSVGGlyph(aContext, point, mode,
details->mGlyphID,
aContextPaint, aCallbacks,
emittedGlyphs)) {
continue;
}
}
glyph = glyphs.AppendGlyph();
glyph->index = details->mGlyphID;
glyph->x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->y = ToDeviceUnits(y + details->mYOffset, devUnitsPerAppUnit);
glyphs.Flush(cr, aDrawMode, isRTL, aContextPaint, globalMatrix);
if (IsSyntheticBold()) {
double strikeOffset = synBoldOnePixelOffset;
int32_t strikeCount = strikes;
do {
cairo_glyph_t *doubleglyph;
doubleglyph = glyphs.AppendGlyph();
doubleglyph->index = glyph->index;
doubleglyph->x =
ToDeviceUnits(glyphX + strikeOffset *
appUnitsPerDevUnit,
devUnitsPerAppUnit);
doubleglyph->y = glyph->y;
strikeOffset += synBoldOnePixelOffset;
glyphs.Flush(cr, aDrawMode, isRTL, aContextPaint, globalMatrix);
} while (--strikeCount > 0);
}
emittedGlyphs = true;
}
}
}
}
if (aSpacing) {
double space = aSpacing[i - aStart].mAfter;
if (i + 1 < aEnd) {
space += aSpacing[i + 1 - aStart].mBefore;
}
x += direction*space;
}
}
if (gfxFontTestStore::CurrentStore()) {
/* This assumes that the tests won't have anything that results
* in more than GLYPH_BUFFER_SIZE glyphs. Do this before we
* flush, since that'll blow away the num_glyphs.
*/
gfxFontTestStore::CurrentStore()->AddItem(GetName(),
glyphs.mGlyphBuffer,
glyphs.mNumGlyphs);
}
// draw any remaining glyphs
glyphs.Flush(cr, aDrawMode, isRTL, aContextPaint, globalMatrix, true);
if (aCallbacks && emittedGlyphs) {
aCallbacks->NotifyGlyphPathEmitted();
}
} else {
RefPtr<ScaledFont> scaledFont = GetScaledFont(dt);
if (!scaledFont) {
return;
}
bool oldSubpixelAA = dt->GetPermitSubpixelAA();
if (!AllowSubpixelAA()) {
dt->SetPermitSubpixelAA(false);
}
GlyphBufferAzure glyphs;
Glyph *glyph;
Matrix mat, matInv;
Matrix oldMat = dt->GetTransform();
// This is nullptr when we have inverse-transformed glyphs and we need
// to transform the Brush inside flush.
Matrix *passedInvMatrix = nullptr;
RefPtr<GlyphRenderingOptions> renderingOptions =
GetGlyphRenderingOptions();
DrawOptions drawOptions;
drawOptions.mAntialiasMode = Get2DAAMode(mAntialiasOption);
// The cairo DrawTarget backend uses the cairo_scaled_font directly
// and so has the font skew matrix applied already.
if (mScaledFont &&
dt->GetType() != BackendType::CAIRO) {
cairo_matrix_t matrix;
cairo_scaled_font_get_font_matrix(mScaledFont, &matrix);
if (matrix.xy != 0) {
// If this matrix applies a skew, which can happen when drawing
// oblique fonts, we will set the DrawTarget matrix to apply the
// skew. We'll need to move the glyphs by the inverse of the skew to
// get the glyphs positioned correctly in the new device space
// though, since the font matrix should only be applied to drawing
// the glyphs, and not to their position.
mat = ToMatrix(*reinterpret_cast<gfxMatrix*>(&matrix));
mat._11 = mat._22 = 1.0;
float adjustedSize = mAdjustedSize > 0 ? mAdjustedSize : GetStyle()->size;
mat._21 /= adjustedSize;
dt->SetTransform(mat * oldMat);
matInv = mat;
matInv.Invert();
passedInvMatrix = &matInv;
}
}
if (aSpacing) {
x += direction*aSpacing[0].mBefore;
}
for (i = aStart; i < aEnd; ++i) {
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[i];
if (glyphData->IsSimpleGlyph()) {
double advance = glyphData->GetSimpleAdvance();
double glyphX;
if (isRTL) {
x -= advance;
glyphX = x;
} else {
glyphX = x;
x += advance;
}
if (haveSVGGlyphs) {
if (!paintSVGGlyphs) {
continue;
}
gfxPoint point(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
DrawMode mode = ForcePaintingDrawMode(aDrawMode);
if (RenderSVGGlyph(aContext, point, mode,
glyphData->GetSimpleGlyph(), aContextPaint,
aCallbacks, emittedGlyphs)) {
continue;
}
}
// Perhaps we should put a scale in the cairo context instead of
// doing this scaling here...
// Multiplying by the reciprocal may introduce tiny error here,
// but we assume cairo is going to round coordinates at some stage
// and this is faster
glyph = glyphs.AppendGlyph();
glyph->mIndex = glyphData->GetSimpleGlyph();
glyph->mPosition.x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->mPosition.y = ToDeviceUnits(y, devUnitsPerAppUnit);
glyph->mPosition = matInv * glyph->mPosition;
glyphs.Flush(dt, aContextPaint, scaledFont,
aDrawMode, isRTL, renderingOptions,
aContext, passedInvMatrix,
drawOptions);
// synthetic bolding by multi-striking with 1-pixel offsets
// at least once, more if there's room (large font sizes)
if (IsSyntheticBold()) {
double strikeOffset = synBoldOnePixelOffset;
int32_t strikeCount = strikes;
do {
Glyph *doubleglyph;
doubleglyph = glyphs.AppendGlyph();
doubleglyph->mIndex = glyph->mIndex;
doubleglyph->mPosition.x =
ToDeviceUnits(glyphX + strikeOffset * appUnitsPerDevUnit,
devUnitsPerAppUnit);
doubleglyph->mPosition.y = glyph->mPosition.y;
doubleglyph->mPosition = matInv * doubleglyph->mPosition;
strikeOffset += synBoldOnePixelOffset;
glyphs.Flush(dt, aContextPaint, scaledFont,
aDrawMode, isRTL, renderingOptions,
aContext, passedInvMatrix,
drawOptions);
} while (--strikeCount > 0);
}
emittedGlyphs = true;
} else {
uint32_t glyphCount = glyphData->GetGlyphCount();
if (glyphCount > 0) {
const gfxTextRun::DetailedGlyph *details =
aTextRun->GetDetailedGlyphs(i);
NS_ASSERTION(details, "detailedGlyph should not be missing!");
double advance;
for (uint32_t j = 0; j < glyphCount; ++j, ++details, x += direction * advance) {
advance = details->mAdvance;
if (glyphData->IsMissing()) {
// default ignorable characters will have zero advance width.
// we don't have to draw the hexbox for them
if (aDrawMode != DrawMode::GLYPH_PATH && advance > 0) {
double glyphX = x;
if (isRTL) {
glyphX -= advance;
}
gfxPoint pt(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
gfxFloat advanceDevUnits = ToDeviceUnits(advance, devUnitsPerAppUnit);
gfxFloat height = GetMetrics().maxAscent;
gfxRect glyphRect(pt.x, pt.y - height, advanceDevUnits, height);
gfxFontMissingGlyphs::DrawMissingGlyph(aContext,
glyphRect,
details->mGlyphID,
appUnitsPerDevUnit);
}
} else {
double glyphX = x + details->mXOffset;
if (isRTL) {
glyphX -= advance;
}
gfxPoint point(ToDeviceUnits(glyphX, devUnitsPerAppUnit),
ToDeviceUnits(y, devUnitsPerAppUnit));
if (haveSVGGlyphs) {
if (!paintSVGGlyphs) {
continue;
}
DrawMode mode = ForcePaintingDrawMode(aDrawMode);
if (RenderSVGGlyph(aContext, point, mode,
details->mGlyphID,
aContextPaint, aCallbacks,
emittedGlyphs)) {
continue;
}
}
glyph = glyphs.AppendGlyph();
glyph->mIndex = details->mGlyphID;
glyph->mPosition.x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->mPosition.y = ToDeviceUnits(y + details->mYOffset, devUnitsPerAppUnit);
glyph->mPosition = matInv * glyph->mPosition;
glyphs.Flush(dt, aContextPaint, scaledFont, aDrawMode,
isRTL, renderingOptions, aContext, passedInvMatrix,
drawOptions);
if (IsSyntheticBold()) {
double strikeOffset = synBoldOnePixelOffset;
int32_t strikeCount = strikes;
do {
Glyph *doubleglyph;
doubleglyph = glyphs.AppendGlyph();
doubleglyph->mIndex = glyph->mIndex;
doubleglyph->mPosition.x =
ToDeviceUnits(glyphX + strikeOffset *
appUnitsPerDevUnit,
devUnitsPerAppUnit);
doubleglyph->mPosition.y = glyph->mPosition.y;
strikeOffset += synBoldOnePixelOffset;
doubleglyph->mPosition = matInv * doubleglyph->mPosition;
glyphs.Flush(dt, aContextPaint, scaledFont,
aDrawMode, isRTL, renderingOptions,
aContext, passedInvMatrix, drawOptions);
} while (--strikeCount > 0);
}
emittedGlyphs = true;
}
}
}
}
if (aSpacing) {
double space = aSpacing[i - aStart].mAfter;
if (i + 1 < aEnd) {
space += aSpacing[i + 1 - aStart].mBefore;
}
x += direction*space;
}
}
glyphs.Flush(dt, aContextPaint, scaledFont, aDrawMode, isRTL,
renderingOptions, aContext, passedInvMatrix,
drawOptions, true);
if (aCallbacks && emittedGlyphs) {
aCallbacks->NotifyGlyphPathEmitted();
}
dt->SetTransform(oldMat);
dt->SetPermitSubpixelAA(oldSubpixelAA);
}
*aPt = gfxPoint(x, y);
}
bool
gfxFont::RenderSVGGlyph(gfxContext *aContext, gfxPoint aPoint, DrawMode aDrawMode,
uint32_t aGlyphId, gfxTextContextPaint *aContextPaint)
{
if (!GetFontEntry()->HasSVGGlyph(aGlyphId)) {
return false;
}
const gfxFloat devUnitsPerSVGUnit =
GetAdjustedSize() / GetFontEntry()->UnitsPerEm();
gfxContextMatrixAutoSaveRestore matrixRestore(aContext);
aContext->Translate(gfxPoint(aPoint.x, aPoint.y));
aContext->Scale(devUnitsPerSVGUnit, devUnitsPerSVGUnit);
aContextPaint->InitStrokeGeometry(aContext, devUnitsPerSVGUnit);
return GetFontEntry()->RenderSVGGlyph(aContext, aGlyphId, int(aDrawMode),
aContextPaint);
}
bool
gfxFont::RenderSVGGlyph(gfxContext *aContext, gfxPoint aPoint, DrawMode aDrawMode,
uint32_t aGlyphId, gfxTextContextPaint *aContextPaint,
gfxTextRunDrawCallbacks *aCallbacks,
bool& aEmittedGlyphs)
{
if (aCallbacks) {
if (aEmittedGlyphs) {
aCallbacks->NotifyGlyphPathEmitted();
aEmittedGlyphs = false;
}
aCallbacks->NotifyBeforeSVGGlyphPainted();
}
bool rendered = RenderSVGGlyph(aContext, aPoint, aDrawMode, aGlyphId,
aContextPaint);
if (aCallbacks) {
aCallbacks->NotifyAfterSVGGlyphPainted();
}
return rendered;
}
static void
UnionRange(gfxFloat aX, gfxFloat* aDestMin, gfxFloat* aDestMax)
{
*aDestMin = std::min(*aDestMin, aX);
*aDestMax = std::max(*aDestMax, aX);
}
// We get precise glyph extents if the textrun creator requested them, or
// if the font is a user font --- in which case the author may be relying
// on overflowing glyphs.
static bool
NeedsGlyphExtents(gfxFont *aFont, gfxTextRun *aTextRun)
{
return (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_NEED_BOUNDING_BOX) ||
aFont->GetFontEntry()->IsUserFont();
}
static bool
NeedsGlyphExtents(gfxTextRun *aTextRun)
{
if (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_NEED_BOUNDING_BOX)
return true;
uint32_t numRuns;
const gfxTextRun::GlyphRun *glyphRuns = aTextRun->GetGlyphRuns(&numRuns);
for (uint32_t i = 0; i < numRuns; ++i) {
if (glyphRuns[i].mFont->GetFontEntry()->IsUserFont())
return true;
}
return false;
}
gfxFont::RunMetrics
gfxFont::Measure(gfxTextRun *aTextRun,
uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
Spacing *aSpacing)
{
// If aBoundingBoxType is TIGHT_HINTED_OUTLINE_EXTENTS
// and the underlying cairo font may be antialiased,
// we need to create a copy in order to avoid getting cached extents.
// This is only used by MathML layout at present.
if (aBoundingBoxType == TIGHT_HINTED_OUTLINE_EXTENTS &&
mAntialiasOption != kAntialiasNone) {
if (!mNonAAFont) {
mNonAAFont = CopyWithAntialiasOption(kAntialiasNone);
}
// if font subclass doesn't implement CopyWithAntialiasOption(),
// it will return null and we'll proceed to use the existing font
if (mNonAAFont) {
return mNonAAFont->Measure(aTextRun, aStart, aEnd,
TIGHT_HINTED_OUTLINE_EXTENTS,
aRefContext, aSpacing);
}
}
const int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
// Current position in appunits
const gfxFont::Metrics& fontMetrics = GetMetrics();
RunMetrics metrics;
metrics.mAscent = fontMetrics.maxAscent*appUnitsPerDevUnit;
metrics.mDescent = fontMetrics.maxDescent*appUnitsPerDevUnit;
if (aStart == aEnd) {
// exit now before we look at aSpacing[0], which is undefined
metrics.mBoundingBox = gfxRect(0, -metrics.mAscent, 0, metrics.mAscent + metrics.mDescent);
return metrics;
}
gfxFloat advanceMin = 0, advanceMax = 0;
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
bool isRTL = aTextRun->IsRightToLeft();
double direction = aTextRun->GetDirection();
bool needsGlyphExtents = NeedsGlyphExtents(this, aTextRun);
gfxGlyphExtents *extents =
(aBoundingBoxType == LOOSE_INK_EXTENTS &&
!needsGlyphExtents &&
!aTextRun->HasDetailedGlyphs()) ? nullptr
: GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
double x = 0;
if (aSpacing) {
x += direction*aSpacing[0].mBefore;
}
uint32_t i;
for (i = aStart; i < aEnd; ++i) {
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[i];
if (glyphData->IsSimpleGlyph()) {
double advance = glyphData->GetSimpleAdvance();
// Only get the real glyph horizontal extent if we were asked
// for the tight bounding box or we're in quality mode
if ((aBoundingBoxType != LOOSE_INK_EXTENTS || needsGlyphExtents) &&
extents) {
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
uint16_t extentsWidth = extents->GetContainedGlyphWidthAppUnits(glyphIndex);
if (extentsWidth != gfxGlyphExtents::INVALID_WIDTH &&
aBoundingBoxType == LOOSE_INK_EXTENTS) {
UnionRange(x, &advanceMin, &advanceMax);
UnionRange(x + direction*extentsWidth, &advanceMin, &advanceMax);
} else {
gfxRect glyphRect;
if (!extents->GetTightGlyphExtentsAppUnits(this,
aRefContext, glyphIndex, &glyphRect)) {
glyphRect = gfxRect(0, metrics.mBoundingBox.Y(),
advance, metrics.mBoundingBox.Height());
}
if (isRTL) {
glyphRect -= gfxPoint(advance, 0);
}
glyphRect += gfxPoint(x, 0);
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
}
}
x += direction*advance;
} else {
uint32_t glyphCount = glyphData->GetGlyphCount();
if (glyphCount > 0) {
const gfxTextRun::DetailedGlyph *details =
aTextRun->GetDetailedGlyphs(i);
NS_ASSERTION(details != nullptr,
"detaiedGlyph record should not be missing!");
uint32_t j;
for (j = 0; j < glyphCount; ++j, ++details) {
uint32_t glyphIndex = details->mGlyphID;
gfxPoint glyphPt(x + details->mXOffset, details->mYOffset);
double advance = details->mAdvance;
gfxRect glyphRect;
if (glyphData->IsMissing() || !extents ||
!extents->GetTightGlyphExtentsAppUnits(this,
aRefContext, glyphIndex, &glyphRect)) {
// We might have failed to get glyph extents due to
// OOM or something
glyphRect = gfxRect(0, -metrics.mAscent,
advance, metrics.mAscent + metrics.mDescent);
}
if (isRTL) {
glyphRect -= gfxPoint(advance, 0);
}
glyphRect += gfxPoint(x, 0);
metrics.mBoundingBox = metrics.mBoundingBox.Union(glyphRect);
x += direction*advance;
}
}
}
// Every other glyph type is ignored
if (aSpacing) {
double space = aSpacing[i - aStart].mAfter;
if (i + 1 < aEnd) {
space += aSpacing[i + 1 - aStart].mBefore;
}
x += direction*space;
}
}
if (aBoundingBoxType == LOOSE_INK_EXTENTS) {
UnionRange(x, &advanceMin, &advanceMax);
gfxRect fontBox(advanceMin, -metrics.mAscent,
advanceMax - advanceMin, metrics.mAscent + metrics.mDescent);
metrics.mBoundingBox = metrics.mBoundingBox.Union(fontBox);
}
if (isRTL) {
metrics.mBoundingBox -= gfxPoint(x, 0);
}
metrics.mAdvanceWidth = x*direction;
return metrics;
}
static PLDHashOperator
NotifyGlyphChangeObservers(nsPtrHashKey<gfxFont::GlyphChangeObserver>* aKey,
void* aClosure)
{
aKey->GetKey()->NotifyGlyphsChanged();
return PL_DHASH_NEXT;
}
void
gfxFont::NotifyGlyphsChanged()
{
uint32_t i, count = mGlyphExtentsArray.Length();
for (i = 0; i < count; ++i) {
// Flush cached extents array
mGlyphExtentsArray[i]->NotifyGlyphsChanged();
}
if (mGlyphChangeObservers) {
mGlyphChangeObservers->EnumerateEntries(NotifyGlyphChangeObservers, nullptr);
}
}
static bool
IsBoundarySpace(char16_t aChar, char16_t aNextChar)
{
return (aChar == ' ' || aChar == 0x00A0) && !IsClusterExtender(aNextChar);
}
static inline uint32_t
HashMix(uint32_t aHash, char16_t aCh)
{
return (aHash >> 28) ^ (aHash << 4) ^ aCh;
}
#ifdef __GNUC__
#define GFX_MAYBE_UNUSED __attribute__((unused))
#else
#define GFX_MAYBE_UNUSED
#endif
template<typename T>
gfxShapedWord*
gfxFont::GetShapedWord(gfxContext *aContext,
const T *aText,
uint32_t aLength,
uint32_t aHash,
int32_t aRunScript,
int32_t aAppUnitsPerDevUnit,
uint32_t aFlags,
gfxTextPerfMetrics *aTextPerf GFX_MAYBE_UNUSED)
{
// if the cache is getting too big, flush it and start over
uint32_t wordCacheMaxEntries =
gfxPlatform::GetPlatform()->WordCacheMaxEntries();
if (mWordCache->Count() > wordCacheMaxEntries) {
NS_WARNING("flushing shaped-word cache");
ClearCachedWords();
}
// if there's a cached entry for this word, just return it
CacheHashKey key(aText, aLength, aHash,
aRunScript,
aAppUnitsPerDevUnit,
aFlags);
CacheHashEntry *entry = mWordCache->PutEntry(key);
if (!entry) {
NS_WARNING("failed to create word cache entry - expect missing text");
return nullptr;
}
gfxShapedWord *sw = entry->mShapedWord;
bool isContent = !mStyle.systemFont;
if (sw) {
sw->ResetAge();
Telemetry::Accumulate((isContent ? Telemetry::WORD_CACHE_HITS_CONTENT :
Telemetry::WORD_CACHE_HITS_CHROME),
aLength);
#ifndef RELEASE_BUILD
if (aTextPerf) {
aTextPerf->current.wordCacheHit++;
}
#endif
return sw;
}
Telemetry::Accumulate((isContent ? Telemetry::WORD_CACHE_MISSES_CONTENT :
Telemetry::WORD_CACHE_MISSES_CHROME),
aLength);
#ifndef RELEASE_BUILD
if (aTextPerf) {
aTextPerf->current.wordCacheMiss++;
}
#endif
sw = entry->mShapedWord = gfxShapedWord::Create(aText, aLength,
aRunScript,
aAppUnitsPerDevUnit,
aFlags);
if (!sw) {
NS_WARNING("failed to create gfxShapedWord - expect missing text");
return nullptr;
}
DebugOnly<bool> ok =
ShapeText(aContext, aText, 0, aLength, aRunScript, sw);
NS_WARN_IF_FALSE(ok, "failed to shape word - expect garbled text");
return sw;
}
bool
gfxFont::CacheHashEntry::KeyEquals(const KeyTypePointer aKey) const
{
const gfxShapedWord *sw = mShapedWord;
if (!sw) {
return false;
}
if (sw->GetLength() != aKey->mLength ||
sw->Flags() != aKey->mFlags ||
sw->GetAppUnitsPerDevUnit() != aKey->mAppUnitsPerDevUnit ||
sw->Script() != aKey->mScript) {
return false;
}
if (sw->TextIs8Bit()) {
if (aKey->mTextIs8Bit) {
return (0 == memcmp(sw->Text8Bit(), aKey->mText.mSingle,
aKey->mLength * sizeof(uint8_t)));
}
// The key has 16-bit text, even though all the characters are < 256,
// so the TEXT_IS_8BIT flag was set and the cached ShapedWord we're
// comparing with will have 8-bit text.
const uint8_t *s1 = sw->Text8Bit();
const char16_t *s2 = aKey->mText.mDouble;
const char16_t *s2end = s2 + aKey->mLength;
while (s2 < s2end) {
if (*s1++ != *s2++) {
return false;
}
}
return true;
}
NS_ASSERTION((aKey->mFlags & gfxTextRunFactory::TEXT_IS_8BIT) == 0 &&
!aKey->mTextIs8Bit, "didn't expect 8-bit text here");
return (0 == memcmp(sw->TextUnicode(), aKey->mText.mDouble,
aKey->mLength * sizeof(char16_t)));
}
bool
gfxFont::ShapeText(gfxContext *aContext,
const uint8_t *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxShapedText *aShapedText,
bool aPreferPlatformShaping)
{
nsDependentCSubstring ascii((const char*)aText, aLength);
nsAutoString utf16;
AppendASCIItoUTF16(ascii, utf16);
if (utf16.Length() != aLength) {
return false;
}
return ShapeText(aContext, utf16.BeginReading(), aOffset, aLength,
aScript, aShapedText, aPreferPlatformShaping);
}
bool
gfxFont::ShapeText(gfxContext *aContext,
const char16_t *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxShapedText *aShapedText,
bool aPreferPlatformShaping)
{
bool ok = false;
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
ok = mGraphiteShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
}
if (!ok && mHarfBuzzShaper && !aPreferPlatformShaping) {
if (gfxPlatform::GetPlatform()->UseHarfBuzzForScript(aScript)) {
ok = mHarfBuzzShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
}
}
if (!ok) {
if (!mPlatformShaper) {
CreatePlatformShaper();
NS_ASSERTION(mPlatformShaper, "no platform shaper available!");
}
if (mPlatformShaper) {
ok = mPlatformShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
}
}
PostShapingFixup(aContext, aText, aOffset, aLength, aShapedText);
return ok;
}
void
gfxFont::PostShapingFixup(gfxContext *aContext,
const char16_t *aText,
uint32_t aOffset,
uint32_t aLength,
gfxShapedText *aShapedText)
{
if (IsSyntheticBold()) {
float synBoldOffset =
GetSyntheticBoldOffset() * CalcXScale(aContext);
aShapedText->AdjustAdvancesForSyntheticBold(synBoldOffset,
aOffset, aLength);
}
}
#define MAX_SHAPING_LENGTH 32760 // slightly less than 32K, trying to avoid
// over-stressing platform shapers
#define BACKTRACK_LIMIT 16 // backtrack this far looking for a good place
// to split into fragments for separate shaping
template<typename T>
bool
gfxFont::ShapeFragmentWithoutWordCache(gfxContext *aContext,
const T *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxTextRun *aTextRun)
{
aTextRun->SetupClusterBoundaries(aOffset, aText, aLength);
bool ok = true;
while (ok && aLength > 0) {
uint32_t fragLen = aLength;
// limit the length of text we pass to shapers in a single call
if (fragLen > MAX_SHAPING_LENGTH) {
fragLen = MAX_SHAPING_LENGTH;
// in the 8-bit case, there are no multi-char clusters,
// so we don't need to do this check
if (sizeof(T) == sizeof(char16_t)) {
uint32_t i;
for (i = 0; i < BACKTRACK_LIMIT; ++i) {
if (aTextRun->IsClusterStart(aOffset + fragLen - i)) {
fragLen -= i;
break;
}
}
if (i == BACKTRACK_LIMIT) {
// if we didn't find any cluster start while backtracking,
// just check that we're not in the middle of a surrogate
// pair; back up by one code unit if we are.
if (NS_IS_LOW_SURROGATE(aText[fragLen]) &&
NS_IS_HIGH_SURROGATE(aText[fragLen - 1])) {
--fragLen;
}
}
}
}
ok = ShapeText(aContext, aText, aOffset, fragLen, aScript, aTextRun);
aText += fragLen;
aOffset += fragLen;
aLength -= fragLen;
}
return ok;
}
// Check if aCh is an unhandled control character that should be displayed
// as a hexbox rather than rendered by some random font on the system.
// We exclude \r as stray &#13;s are rather common (bug 941940).
// Note that \n and \t don't come through here, as they have specific
// meanings that have already been handled.
static bool
IsInvalidControlChar(uint32_t aCh)
{
return aCh != '\r' && ((aCh & 0x7f) < 0x20 || aCh == 0x7f);
}
template<typename T>
bool
gfxFont::ShapeTextWithoutWordCache(gfxContext *aContext,
const T *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxTextRun *aTextRun)
{
uint32_t fragStart = 0;
bool ok = true;
for (uint32_t i = 0; i <= aLength && ok; ++i) {
T ch = (i < aLength) ? aText[i] : '\n';
bool invalid = gfxFontGroup::IsInvalidChar(ch);
uint32_t length = i - fragStart;
// break into separate fragments when we hit an invalid char
if (!invalid) {
continue;
}
if (length > 0) {
ok = ShapeFragmentWithoutWordCache(aContext, aText + fragStart,
aOffset + fragStart, length,
aScript, aTextRun);
}
if (i == aLength) {
break;
}
// fragment was terminated by an invalid char: skip it,
// unless it's a control char that we want to show as a hexbox,
// but record where TAB or NEWLINE occur
if (ch == '\t') {
aTextRun->SetIsTab(aOffset + i);
} else if (ch == '\n') {
aTextRun->SetIsNewline(aOffset + i);
} else if (IsInvalidControlChar(ch) &&
!(aTextRun->GetFlags() & gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS)) {
aTextRun->SetMissingGlyph(aOffset + i, ch, this);
}
fragStart = i + 1;
}
NS_WARN_IF_FALSE(ok, "failed to shape text - expect garbled text");
return ok;
}
#ifndef RELEASE_BUILD
#define TEXT_PERF_INCR(tp, m) (tp ? (tp)->current.m++ : 0)
#else
#define TEXT_PERF_INCR(tp, m)
#endif
inline static bool IsChar8Bit(uint8_t /*aCh*/) { return true; }
inline static bool IsChar8Bit(char16_t aCh) { return aCh < 0x100; }
inline static bool HasSpaces(const uint8_t *aString, uint32_t aLen)
{
return memchr(aString, 0x20, aLen) != nullptr;
}
inline static bool HasSpaces(const char16_t *aString, uint32_t aLen)
{
for (const char16_t *ch = aString; ch < aString + aLen; ch++) {
if (*ch == 0x20) {
return true;
}
}
return false;
}
template<typename T>
bool
gfxFont::SplitAndInitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const T *aString,
uint32_t aRunStart,
uint32_t aRunLength,
int32_t aRunScript)
{
if (aRunLength == 0) {
return true;
}
gfxTextPerfMetrics *tp = nullptr;
#ifndef RELEASE_BUILD
tp = aTextRun->GetFontGroup()->GetTextPerfMetrics();
if (tp) {
if (mStyle.systemFont) {
tp->current.numChromeTextRuns++;
} else {
tp->current.numContentTextRuns++;
}
tp->current.numChars += aRunLength;
if (aRunLength > tp->current.maxTextRunLen) {
tp->current.maxTextRunLen = aRunLength;
}
}
#endif
uint32_t wordCacheCharLimit =
gfxPlatform::GetPlatform()->WordCacheCharLimit();
// If spaces can participate in shaping (e.g. within lookups for automatic
// fractions), need to shape without using the word cache which segments
// textruns on space boundaries. Word cache can be used if the textrun
// is short enough to fit in the word cache and it lacks spaces.
if (SpaceMayParticipateInShaping(aRunScript)) {
if (aRunLength > wordCacheCharLimit ||
HasSpaces(aString + aRunStart, aRunLength)) {
TEXT_PERF_INCR(tp, wordCacheSpaceRules);
return ShapeTextWithoutWordCache(aContext, aString + aRunStart,
aRunStart, aRunLength, aRunScript,
aTextRun);
}
}
InitWordCache();
// the only flags we care about for ShapedWord construction/caching
uint32_t flags = aTextRun->GetFlags();
flags &= (gfxTextRunFactory::TEXT_IS_RTL |
gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES |
gfxTextRunFactory::TEXT_USE_MATH_SCRIPT);
if (sizeof(T) == sizeof(uint8_t)) {
flags |= gfxTextRunFactory::TEXT_IS_8BIT;
}
const T *text = aString + aRunStart;
uint32_t wordStart = 0;
uint32_t hash = 0;
bool wordIs8Bit = true;
int32_t appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
T nextCh = text[0];
for (uint32_t i = 0; i <= aRunLength; ++i) {
T ch = nextCh;
nextCh = (i < aRunLength - 1) ? text[i + 1] : '\n';
bool boundary = IsBoundarySpace(ch, nextCh);
bool invalid = !boundary && gfxFontGroup::IsInvalidChar(ch);
uint32_t length = i - wordStart;
// break into separate ShapedWords when we hit an invalid char,
// or a boundary space (always handled individually),
// or the first non-space after a space
if (!boundary && !invalid) {
if (!IsChar8Bit(ch)) {
wordIs8Bit = false;
}
// include this character in the hash, and move on to next
hash = HashMix(hash, ch);
continue;
}
// We've decided to break here (i.e. we're at the end of a "word");
// shape the word and add it to the textrun.
// For words longer than the limit, we don't use the
// font's word cache but just shape directly into the textrun.
if (length > wordCacheCharLimit) {
TEXT_PERF_INCR(tp, wordCacheLong);
bool ok = ShapeFragmentWithoutWordCache(aContext,
text + wordStart,
aRunStart + wordStart,
length,
aRunScript,
aTextRun);
if (!ok) {
return false;
}
} else if (length > 0) {
uint32_t wordFlags = flags;
// in the 8-bit version of this method, TEXT_IS_8BIT was
// already set as part of |flags|, so no need for a per-word
// adjustment here
if (sizeof(T) == sizeof(char16_t)) {
if (wordIs8Bit) {
wordFlags |= gfxTextRunFactory::TEXT_IS_8BIT;
}
}
gfxShapedWord *sw = GetShapedWord(aContext,
text + wordStart, length,
hash, aRunScript,
appUnitsPerDevUnit,
wordFlags, tp);
if (sw) {
aTextRun->CopyGlyphDataFrom(sw, aRunStart + wordStart);
} else {
return false; // failed, presumably out of memory?
}
}
if (boundary) {
// word was terminated by a space: add that to the textrun
if (!aTextRun->SetSpaceGlyphIfSimple(this, aContext,
aRunStart + i, ch))
{
static const uint8_t space = ' ';
gfxShapedWord *sw =
GetShapedWord(aContext,
&space, 1,
HashMix(0, ' '), aRunScript,
appUnitsPerDevUnit,
flags | gfxTextRunFactory::TEXT_IS_8BIT, tp);
if (sw) {
aTextRun->CopyGlyphDataFrom(sw, aRunStart + i);
} else {
return false;
}
}
hash = 0;
wordStart = i + 1;
wordIs8Bit = true;
continue;
}
if (i == aRunLength) {
break;
}
NS_ASSERTION(invalid,
"how did we get here except via an invalid char?");
// word was terminated by an invalid char: skip it,
// unless it's a control char that we want to show as a hexbox,
// but record where TAB or NEWLINE occur
if (ch == '\t') {
aTextRun->SetIsTab(aRunStart + i);
} else if (ch == '\n') {
aTextRun->SetIsNewline(aRunStart + i);
} else if (IsInvalidControlChar(ch) &&
!(aTextRun->GetFlags() & gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS)) {
aTextRun->SetMissingGlyph(aRunStart + i, ch, this);
}
hash = 0;
wordStart = i + 1;
wordIs8Bit = true;
}
return true;
}
gfxGlyphExtents *
gfxFont::GetOrCreateGlyphExtents(int32_t aAppUnitsPerDevUnit) {
uint32_t i, count = mGlyphExtentsArray.Length();
for (i = 0; i < count; ++i) {
if (mGlyphExtentsArray[i]->GetAppUnitsPerDevUnit() == aAppUnitsPerDevUnit)
return mGlyphExtentsArray[i];
}
gfxGlyphExtents *glyphExtents = new gfxGlyphExtents(aAppUnitsPerDevUnit);
if (glyphExtents) {
mGlyphExtentsArray.AppendElement(glyphExtents);
// Initialize the extents of a space glyph, assuming that spaces don't
// render anything!
glyphExtents->SetContainedGlyphWidthAppUnits(GetSpaceGlyph(), 0);
}
return glyphExtents;
}
void
gfxFont::SetupGlyphExtents(gfxContext *aContext, uint32_t aGlyphID, bool aNeedTight,
gfxGlyphExtents *aExtents)
{
gfxContextMatrixAutoSaveRestore matrixRestore(aContext);
aContext->IdentityMatrix();
gfxRect svgBounds;
if (mFontEntry->TryGetSVGData(this) && mFontEntry->HasSVGGlyph(aGlyphID) &&
mFontEntry->GetSVGGlyphExtents(aContext, aGlyphID, &svgBounds)) {
gfxFloat d2a = aExtents->GetAppUnitsPerDevUnit();
aExtents->SetTightGlyphExtents(aGlyphID,
gfxRect(svgBounds.x * d2a,
svgBounds.y * d2a,
svgBounds.width * d2a,
svgBounds.height * d2a));
return;
}
cairo_glyph_t glyph;
glyph.index = aGlyphID;
glyph.x = 0;
glyph.y = 0;
cairo_text_extents_t extents;
cairo_glyph_extents(aContext->GetCairo(), &glyph, 1, &extents);
const Metrics& fontMetrics = GetMetrics();
int32_t appUnitsPerDevUnit = aExtents->GetAppUnitsPerDevUnit();
if (!aNeedTight && extents.x_bearing >= 0 &&
extents.y_bearing >= -fontMetrics.maxAscent &&
extents.height + extents.y_bearing <= fontMetrics.maxDescent) {
uint32_t appUnitsWidth =
uint32_t(ceil((extents.x_bearing + extents.width)*appUnitsPerDevUnit));
if (appUnitsWidth < gfxGlyphExtents::INVALID_WIDTH) {
aExtents->SetContainedGlyphWidthAppUnits(aGlyphID, uint16_t(appUnitsWidth));
return;
}
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
if (!aNeedTight) {
++gGlyphExtentsSetupFallBackToTight;
}
#endif
gfxFloat d2a = appUnitsPerDevUnit;
gfxRect bounds(extents.x_bearing*d2a, extents.y_bearing*d2a,
extents.width*d2a, extents.height*d2a);
aExtents->SetTightGlyphExtents(aGlyphID, bounds);
}
// Try to initialize font metrics by reading sfnt tables directly;
// set mIsValid=TRUE and return TRUE on success.
// Return FALSE if the gfxFontEntry subclass does not
// implement GetFontTable(), or for non-sfnt fonts where tables are
// not available.
// If this returns TRUE without setting the mIsValid flag, then we -did-
// apparently find an sfnt, but it was too broken to be used.
bool
gfxFont::InitMetricsFromSfntTables(Metrics& aMetrics)
{
mIsValid = false; // font is NOT valid in case of early return
const uint32_t kHheaTableTag = TRUETYPE_TAG('h','h','e','a');
const uint32_t kPostTableTag = TRUETYPE_TAG('p','o','s','t');
const uint32_t kOS_2TableTag = TRUETYPE_TAG('O','S','/','2');
uint32_t len;
if (mFUnitsConvFactor == 0.0) {
// If the conversion factor from FUnits is not yet set,
// get the unitsPerEm from the 'head' table via the font entry
uint16_t unitsPerEm = GetFontEntry()->UnitsPerEm();
if (unitsPerEm == gfxFontEntry::kInvalidUPEM) {
return false;
}
mFUnitsConvFactor = mAdjustedSize / unitsPerEm;
}
// 'hhea' table is required to get vertical extents
gfxFontEntry::AutoTable hheaTable(mFontEntry, kHheaTableTag);
if (!hheaTable) {
return false; // no 'hhea' table -> not an sfnt
}
const HheaTable* hhea =
reinterpret_cast<const HheaTable*>(hb_blob_get_data(hheaTable, &len));
if (len < sizeof(HheaTable)) {
return false;
}
#define SET_UNSIGNED(field,src) aMetrics.field = uint16_t(src) * mFUnitsConvFactor
#define SET_SIGNED(field,src) aMetrics.field = int16_t(src) * mFUnitsConvFactor
SET_UNSIGNED(maxAdvance, hhea->advanceWidthMax);
SET_SIGNED(maxAscent, hhea->ascender);
SET_SIGNED(maxDescent, -int16_t(hhea->descender));
SET_SIGNED(externalLeading, hhea->lineGap);
// 'post' table is required for underline metrics
gfxFontEntry::AutoTable postTable(mFontEntry, kPostTableTag);
if (!postTable) {
return true; // no 'post' table -> sfnt is not valid
}
const PostTable *post =
reinterpret_cast<const PostTable*>(hb_blob_get_data(postTable, &len));
if (len < offsetof(PostTable, underlineThickness) + sizeof(uint16_t)) {
return true; // bad post table -> sfnt is not valid
}
SET_SIGNED(underlineOffset, post->underlinePosition);
SET_UNSIGNED(underlineSize, post->underlineThickness);
// 'OS/2' table is optional, if not found we'll estimate xHeight
// and aveCharWidth by measuring glyphs
gfxFontEntry::AutoTable os2Table(mFontEntry, kOS_2TableTag);
if (os2Table) {
const OS2Table *os2 =
reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
if (len >= offsetof(OS2Table, sxHeight) + sizeof(int16_t) &&
uint16_t(os2->version) >= 2) {
// version 2 and later includes the x-height field
SET_SIGNED(xHeight, os2->sxHeight);
// Abs because of negative xHeight seen in Kokonor (Tibetan) font
aMetrics.xHeight = Abs(aMetrics.xHeight);
}
// this should always be present
if (len >= offsetof(OS2Table, yStrikeoutPosition) + sizeof(int16_t)) {
SET_SIGNED(aveCharWidth, os2->xAvgCharWidth);
SET_SIGNED(subscriptOffset, os2->ySubscriptYOffset);
SET_SIGNED(superscriptOffset, os2->ySuperscriptYOffset);
SET_SIGNED(strikeoutSize, os2->yStrikeoutSize);
SET_SIGNED(strikeoutOffset, os2->yStrikeoutPosition);
}
}
mIsValid = true;
return true;
}
static double
RoundToNearestMultiple(double aValue, double aFraction)
{
return floor(aValue/aFraction + 0.5) * aFraction;
}
void gfxFont::CalculateDerivedMetrics(Metrics& aMetrics)
{
aMetrics.maxAscent =
ceil(RoundToNearestMultiple(aMetrics.maxAscent, 1/1024.0));
aMetrics.maxDescent =
ceil(RoundToNearestMultiple(aMetrics.maxDescent, 1/1024.0));
if (aMetrics.xHeight <= 0) {
// only happens if we couldn't find either font metrics
// or a char to measure;
// pick an arbitrary value that's better than zero
aMetrics.xHeight = aMetrics.maxAscent * DEFAULT_XHEIGHT_FACTOR;
}
aMetrics.maxHeight = aMetrics.maxAscent + aMetrics.maxDescent;
if (aMetrics.maxHeight - aMetrics.emHeight > 0.0) {
aMetrics.internalLeading = aMetrics.maxHeight - aMetrics.emHeight;
} else {
aMetrics.internalLeading = 0.0;
}
aMetrics.emAscent = aMetrics.maxAscent * aMetrics.emHeight
/ aMetrics.maxHeight;
aMetrics.emDescent = aMetrics.emHeight - aMetrics.emAscent;
if (GetFontEntry()->IsFixedPitch()) {
// Some Quartz fonts are fixed pitch, but there's some glyph with a bigger
// advance than the average character width... this forces
// those fonts to be recognized like fixed pitch fonts by layout.
aMetrics.maxAdvance = aMetrics.aveCharWidth;
}
if (!aMetrics.subscriptOffset) {
aMetrics.subscriptOffset = aMetrics.xHeight;
}
if (!aMetrics.superscriptOffset) {
aMetrics.superscriptOffset = aMetrics.xHeight;
}
if (!aMetrics.strikeoutOffset) {
aMetrics.strikeoutOffset = aMetrics.xHeight * 0.5;
}
if (!aMetrics.strikeoutSize) {
aMetrics.strikeoutSize = aMetrics.underlineSize;
}
}
void
gfxFont::SanitizeMetrics(gfxFont::Metrics *aMetrics, bool aIsBadUnderlineFont)
{
// Even if this font size is zero, this font is created with non-zero size.
// However, for layout and others, we should return the metrics of zero size font.
if (mStyle.size == 0.0) {
memset(aMetrics, 0, sizeof(gfxFont::Metrics));
return;
}
// MS (P)Gothic and MS (P)Mincho are not having suitable values in their super script offset.
// If the values are not suitable, we should use x-height instead of them.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=353632
if (aMetrics->superscriptOffset <= 0 ||
aMetrics->superscriptOffset >= aMetrics->maxAscent) {
aMetrics->superscriptOffset = aMetrics->xHeight;
}
// And also checking the case of sub script offset. The old gfx for win has checked this too.
if (aMetrics->subscriptOffset <= 0 ||
aMetrics->subscriptOffset >= aMetrics->maxAscent) {
aMetrics->subscriptOffset = aMetrics->xHeight;
}
aMetrics->underlineSize = std::max(1.0, aMetrics->underlineSize);
aMetrics->strikeoutSize = std::max(1.0, aMetrics->strikeoutSize);
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -1.0);
if (aMetrics->maxAscent < 1.0) {
// We cannot draw strikeout line and overline in the ascent...
aMetrics->underlineSize = 0;
aMetrics->underlineOffset = 0;
aMetrics->strikeoutSize = 0;
aMetrics->strikeoutOffset = 0;
return;
}
/**
* Some CJK fonts have bad underline offset. Therefore, if this is such font,
* we need to lower the underline offset to bottom of *em* descent.
* However, if this is system font, we should not do this for the rendering compatibility with
* another application's UI on the platform.
* XXX Should not use this hack if the font size is too small?
* Such text cannot be read, this might be used for tight CSS rendering? (E.g., Acid2)
*/
if (!mStyle.systemFont && aIsBadUnderlineFont) {
// First, we need 2 pixels between baseline and underline at least. Because many CJK characters
// put their glyphs on the baseline, so, 1 pixel is too close for CJK characters.
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -2.0);
// Next, we put the underline to bottom of below of the descent space.
if (aMetrics->internalLeading + aMetrics->externalLeading > aMetrics->underlineSize) {
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset, -aMetrics->emDescent);
} else {
aMetrics->underlineOffset = std::min(aMetrics->underlineOffset,
aMetrics->underlineSize - aMetrics->emDescent);
}
}
// If underline positioned is too far from the text, descent position is preferred so that underline
// will stay within the boundary.
else if (aMetrics->underlineSize - aMetrics->underlineOffset > aMetrics->maxDescent) {
if (aMetrics->underlineSize > aMetrics->maxDescent)
aMetrics->underlineSize = std::max(aMetrics->maxDescent, 1.0);
// The max underlineOffset is 1px (the min underlineSize is 1px, and min maxDescent is 0px.)
aMetrics->underlineOffset = aMetrics->underlineSize - aMetrics->maxDescent;
}
// If strikeout line is overflowed from the ascent, the line should be resized and moved for
// that being in the ascent space.
// Note that the strikeoutOffset is *middle* of the strikeout line position.
gfxFloat halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
if (halfOfStrikeoutSize + aMetrics->strikeoutOffset > aMetrics->maxAscent) {
if (aMetrics->strikeoutSize > aMetrics->maxAscent) {
aMetrics->strikeoutSize = std::max(aMetrics->maxAscent, 1.0);
halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
}
gfxFloat ascent = floor(aMetrics->maxAscent + 0.5);
aMetrics->strikeoutOffset = std::max(halfOfStrikeoutSize, ascent / 2.0);
}
// If overline is larger than the ascent, the line should be resized.
if (aMetrics->underlineSize > aMetrics->maxAscent) {
aMetrics->underlineSize = aMetrics->maxAscent;
}
}
gfxFloat
gfxFont::SynthesizeSpaceWidth(uint32_t aCh)
{
// return an appropriate width for various Unicode space characters
// that we "fake" if they're not actually present in the font;
// returns negative value if the char is not a known space.
switch (aCh) {
case 0x2000: // en quad
case 0x2002: return GetAdjustedSize() / 2; // en space
case 0x2001: // em quad
case 0x2003: return GetAdjustedSize(); // em space
case 0x2004: return GetAdjustedSize() / 3; // three-per-em space
case 0x2005: return GetAdjustedSize() / 4; // four-per-em space
case 0x2006: return GetAdjustedSize() / 6; // six-per-em space
case 0x2007: return GetMetrics().zeroOrAveCharWidth; // figure space
case 0x2008: return GetMetrics().spaceWidth; // punctuation space
case 0x2009: return GetAdjustedSize() / 5; // thin space
case 0x200a: return GetAdjustedSize() / 10; // hair space
case 0x202f: return GetAdjustedSize() / 5; // narrow no-break space
default: return -1.0;
}
}
/*static*/ size_t
gfxFont::WordCacheEntrySizeOfExcludingThis(CacheHashEntry* aHashEntry,
MallocSizeOf aMallocSizeOf,
void* aUserArg)
{
return aMallocSizeOf(aHashEntry->mShapedWord.get());
}
void
gfxFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
for (uint32_t i = 0; i < mGlyphExtentsArray.Length(); ++i) {
aSizes->mFontInstances +=
mGlyphExtentsArray[i]->SizeOfIncludingThis(aMallocSizeOf);
}
if (mWordCache) {
aSizes->mShapedWords +=
mWordCache->SizeOfExcludingThis(WordCacheEntrySizeOfExcludingThis,
aMallocSizeOf);
}
}
void
gfxFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const
{
aSizes->mFontInstances += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
void
gfxFont::AddGlyphChangeObserver(GlyphChangeObserver *aObserver)
{
if (!mGlyphChangeObservers) {
mGlyphChangeObservers = new nsTHashtable<nsPtrHashKey<GlyphChangeObserver> >;
}
mGlyphChangeObservers->PutEntry(aObserver);
}
void
gfxFont::RemoveGlyphChangeObserver(GlyphChangeObserver *aObserver)
{
NS_ASSERTION(mGlyphChangeObservers, "No observers registered");
NS_ASSERTION(mGlyphChangeObservers->Contains(aObserver), "Observer not registered");
mGlyphChangeObservers->RemoveEntry(aObserver);
}
gfxGlyphExtents::~gfxGlyphExtents()
{
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
gGlyphExtentsWidthsTotalSize +=
mContainedGlyphWidths.SizeOfExcludingThis(&FontCacheMallocSizeOf);
gGlyphExtentsCount++;
#endif
MOZ_COUNT_DTOR(gfxGlyphExtents);
}
bool
gfxGlyphExtents::GetTightGlyphExtentsAppUnits(gfxFont *aFont,
gfxContext *aContext, uint32_t aGlyphID, gfxRect *aExtents)
{
HashEntry *entry = mTightGlyphExtents.GetEntry(aGlyphID);
if (!entry) {
if (!aContext) {
NS_WARNING("Could not get glyph extents (no aContext)");
return false;
}
if (aFont->SetupCairoFont(aContext)) {
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gGlyphExtentsSetupLazyTight;
#endif
aFont->SetupGlyphExtents(aContext, aGlyphID, true, this);
entry = mTightGlyphExtents.GetEntry(aGlyphID);
}
if (!entry) {
NS_WARNING("Could not get glyph extents");
return false;
}
}
*aExtents = gfxRect(entry->x, entry->y, entry->width, entry->height);
return true;
}
gfxGlyphExtents::GlyphWidths::~GlyphWidths()
{
uint32_t i, count = mBlocks.Length();
for (i = 0; i < count; ++i) {
uintptr_t bits = mBlocks[i];
if (bits && !(bits & 0x1)) {
delete[] reinterpret_cast<uint16_t *>(bits);
}
}
}
uint32_t
gfxGlyphExtents::GlyphWidths::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
uint32_t i;
uint32_t size = mBlocks.SizeOfExcludingThis(aMallocSizeOf);
for (i = 0; i < mBlocks.Length(); ++i) {
uintptr_t bits = mBlocks[i];
if (bits && !(bits & 0x1)) {
size += aMallocSizeOf(reinterpret_cast<void*>(bits));
}
}
return size;
}
void
gfxGlyphExtents::GlyphWidths::Set(uint32_t aGlyphID, uint16_t aWidth)
{
uint32_t block = aGlyphID >> BLOCK_SIZE_BITS;
uint32_t len = mBlocks.Length();
if (block >= len) {
uintptr_t *elems = mBlocks.AppendElements(block + 1 - len);
if (!elems)
return;
memset(elems, 0, sizeof(uintptr_t)*(block + 1 - len));
}
uintptr_t bits = mBlocks[block];
uint32_t glyphOffset = aGlyphID & (BLOCK_SIZE - 1);
if (!bits) {
mBlocks[block] = MakeSingle(glyphOffset, aWidth);
return;
}
uint16_t *newBlock;
if (bits & 0x1) {
// Expand the block to a real block. We could avoid this by checking
// glyphOffset == GetGlyphOffset(bits), but that never happens so don't bother
newBlock = new uint16_t[BLOCK_SIZE];
if (!newBlock)
return;
uint32_t i;
for (i = 0; i < BLOCK_SIZE; ++i) {
newBlock[i] = INVALID_WIDTH;
}
newBlock[GetGlyphOffset(bits)] = GetWidth(bits);
mBlocks[block] = reinterpret_cast<uintptr_t>(newBlock);
} else {
newBlock = reinterpret_cast<uint16_t *>(bits);
}
newBlock[glyphOffset] = aWidth;
}
void
gfxGlyphExtents::SetTightGlyphExtents(uint32_t aGlyphID, const gfxRect& aExtentsAppUnits)
{
HashEntry *entry = mTightGlyphExtents.PutEntry(aGlyphID);
if (!entry)
return;
entry->x = aExtentsAppUnits.X();
entry->y = aExtentsAppUnits.Y();
entry->width = aExtentsAppUnits.Width();
entry->height = aExtentsAppUnits.Height();
}
size_t
gfxGlyphExtents::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return mContainedGlyphWidths.SizeOfExcludingThis(aMallocSizeOf) +
mTightGlyphExtents.SizeOfExcludingThis(nullptr, aMallocSizeOf);
}
size_t
gfxGlyphExtents::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
gfxFontGroup::gfxFontGroup(const nsAString& aFamilies,
const gfxFontStyle *aStyle,
gfxUserFontSet *aUserFontSet)
: mFamilies(aFamilies)
, mStyle(*aStyle)
, mUnderlineOffset(UNDERLINE_OFFSET_NOT_SET)
, mHyphenWidth(-1)
, mUserFontSet(aUserFontSet)
, mTextPerf(nullptr)
, mPageLang(gfxPlatform::GetFontPrefLangFor(aStyle->language))
, mSkipDrawing(false)
{
// We don't use SetUserFontSet() here, as we want to unconditionally call
// BuildFontList() rather than only do UpdateFontList() if it changed.
mCurrGeneration = GetGeneration();
BuildFontList();
}
void
gfxFontGroup::BuildFontList()
{
// "#if" to be removed once all platforms are moved to gfxPlatformFontList interface
// and subclasses of gfxFontGroup eliminated
#if defined(XP_MACOSX) || defined(XP_WIN) || defined(ANDROID)
ForEachFont(FindPlatformFont, this);
if (mFonts.Length() == 0) {
bool needsBold;
gfxPlatformFontList *pfl = gfxPlatformFontList::PlatformFontList();
gfxFontFamily *defaultFamily = pfl->GetDefaultFont(&mStyle);
NS_ASSERTION(defaultFamily,
"invalid default font returned by GetDefaultFont");
if (defaultFamily) {
gfxFontEntry *fe = defaultFamily->FindFontForStyle(mStyle,
needsBold);
if (fe) {
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&mStyle,
needsBold);
if (font) {
mFonts.AppendElement(FamilyFace(defaultFamily, font));
}
}
}
if (mFonts.Length() == 0) {
// Try for a "font of last resort...."
// Because an empty font list would be Really Bad for later code
// that assumes it will be able to get valid metrics for layout,
// just look for the first usable font and put in the list.
// (see bug 554544)
nsAutoTArray<nsRefPtr<gfxFontFamily>,200> families;
pfl->GetFontFamilyList(families);
uint32_t count = families.Length();
for (uint32_t i = 0; i < count; ++i) {
gfxFontEntry *fe = families[i]->FindFontForStyle(mStyle,
needsBold);
if (fe) {
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&mStyle,
needsBold);
if (font) {
mFonts.AppendElement(FamilyFace(families[i], font));
break;
}
}
}
}
if (mFonts.Length() == 0) {
// an empty font list at this point is fatal; we're not going to
// be able to do even the most basic layout operations
char msg[256]; // CHECK buffer length if revising message below
sprintf(msg, "unable to find a usable font (%.220s)",
NS_ConvertUTF16toUTF8(mFamilies).get());
NS_RUNTIMEABORT(msg);
}
}
if (!mStyle.systemFont) {
uint32_t count = mFonts.Length();
for (uint32_t i = 0; i < count; ++i) {
gfxFont* font = mFonts[i].Font();
if (font->GetFontEntry()->mIsBadUnderlineFont) {
gfxFloat first = mFonts[0].Font()->GetMetrics().underlineOffset;
gfxFloat bad = font->GetMetrics().underlineOffset;
mUnderlineOffset = std::min(first, bad);
break;
}
}
}
#endif
}
bool
gfxFontGroup::FindPlatformFont(const nsAString& aName,
const nsACString& aGenericName,
bool aUseFontSet,
void *aClosure)
{
gfxFontGroup *fontGroup = static_cast<gfxFontGroup*>(aClosure);
const gfxFontStyle *fontStyle = fontGroup->GetStyle();
bool needsBold;
gfxFontFamily *family = nullptr;
gfxFontEntry *fe = nullptr;
if (aUseFontSet) {
// First, look up in the user font set...
// If the fontSet matches the family, we must not look for a platform
// font of the same name, even if we fail to actually get a fontEntry
// here; we'll fall back to the next name in the CSS font-family list.
gfxUserFontSet *fs = fontGroup->GetUserFontSet();
if (fs) {
// If the fontSet matches the family, but the font has not yet finished
// loading (nor has its load timeout fired), the fontGroup should wait
// for the download, and not actually draw its text yet.
family = fs->GetFamily(aName);
if (family) {
bool waitForUserFont = false;
fe = fs->FindFontEntry(family, *fontStyle,
needsBold, waitForUserFont);
if (!fe && waitForUserFont) {
fontGroup->mSkipDrawing = true;
}
}
}
}
// Not known in the user font set ==> check system fonts
if (!family) {
gfxPlatformFontList *fontList = gfxPlatformFontList::PlatformFontList();
family = fontList->FindFamily(aName);
if (family) {
fe = family->FindFontForStyle(*fontStyle, needsBold);
}
}
// add to the font group, unless it's already there
if (fe && !fontGroup->HasFont(fe)) {
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(fontStyle, needsBold);
if (font) {
fontGroup->mFonts.AppendElement(FamilyFace(family, font));
}
}
return true;
}
bool
gfxFontGroup::HasFont(const gfxFontEntry *aFontEntry)
{
uint32_t count = mFonts.Length();
for (uint32_t i = 0; i < count; ++i) {
if (mFonts[i].Font()->GetFontEntry() == aFontEntry)
return true;
}
return false;
}
gfxFontGroup::~gfxFontGroup()
{
mFonts.Clear();
}
gfxFontGroup *
gfxFontGroup::Copy(const gfxFontStyle *aStyle)
{
gfxFontGroup *fg = new gfxFontGroup(mFamilies, aStyle, mUserFontSet);
fg->SetTextPerfMetrics(mTextPerf);
return fg;
}
bool
gfxFontGroup::IsInvalidChar(uint8_t ch)
{
return ((ch & 0x7f) < 0x20 || ch == 0x7f);
}
bool
gfxFontGroup::IsInvalidChar(char16_t ch)
{
// All printable 7-bit ASCII values are OK
if (ch >= ' ' && ch < 0x7f) {
return false;
}
// No point in sending non-printing control chars through font shaping
if (ch <= 0x9f) {
return true;
}
return (((ch & 0xFF00) == 0x2000 /* Unicode control character */ &&
(ch == 0x200B/*ZWSP*/ || ch == 0x2028/*LSEP*/ || ch == 0x2029/*PSEP*/)) ||
IsBidiControl(ch));
}
bool
gfxFontGroup::ForEachFont(FontCreationCallback fc,
void *closure)
{
return ForEachFontInternal(mFamilies, mStyle.language,
true, true, true, fc, closure);
}
bool
gfxFontGroup::ForEachFont(const nsAString& aFamilies,
nsIAtom *aLanguage,
FontCreationCallback fc,
void *closure)
{
return ForEachFontInternal(aFamilies, aLanguage,
false, true, true, fc, closure);
}
struct ResolveData {
ResolveData(gfxFontGroup::FontCreationCallback aCallback,
nsACString& aGenericFamily,
bool aUseFontSet,
void *aClosure) :
mCallback(aCallback),
mGenericFamily(aGenericFamily),
mUseFontSet(aUseFontSet),
mClosure(aClosure) {
}
gfxFontGroup::FontCreationCallback mCallback;
nsCString mGenericFamily;
bool mUseFontSet;
void *mClosure;
};
bool
gfxFontGroup::ForEachFontInternal(const nsAString& aFamilies,
nsIAtom *aLanguage,
bool aResolveGeneric,
bool aResolveFontName,
bool aUseFontSet,
FontCreationCallback fc,
void *closure)
{
const char16_t kSingleQuote = char16_t('\'');
const char16_t kDoubleQuote = char16_t('\"');
const char16_t kComma = char16_t(',');
nsIAtom *groupAtom = nullptr;
nsAutoCString groupString;
if (aLanguage) {
if (!gLangService) {
CallGetService(NS_LANGUAGEATOMSERVICE_CONTRACTID, &gLangService);
}
if (gLangService) {
nsresult rv;
groupAtom = gLangService->GetLanguageGroup(aLanguage, &rv);
}
}
if (!groupAtom) {
groupAtom = nsGkAtoms::Unicode;
}
groupAtom->ToUTF8String(groupString);
nsPromiseFlatString families(aFamilies);
const char16_t *p, *p_end;
families.BeginReading(p);
families.EndReading(p_end);
nsAutoString family;
nsAutoCString lcFamily;
nsAutoString genericFamily;
while (p < p_end) {
while (nsCRT::IsAsciiSpace(*p) || *p == kComma)
if (++p == p_end)
return true;
bool generic;
if (*p == kSingleQuote || *p == kDoubleQuote) {
// quoted font family
char16_t quoteMark = *p;
if (++p == p_end)
return true;
const char16_t *nameStart = p;
// XXX What about CSS character escapes?
while (*p != quoteMark)
if (++p == p_end)
return true;
family = Substring(nameStart, p);
generic = false;
genericFamily.SetIsVoid(true);
while (++p != p_end && *p != kComma)
/* nothing */ ;
} else {
// unquoted font family
const char16_t *nameStart = p;
while (++p != p_end && *p != kComma)
/* nothing */ ;
family = Substring(nameStart, p);
family.CompressWhitespace(false, true);
if (aResolveGeneric &&
(family.LowerCaseEqualsLiteral("serif") ||
family.LowerCaseEqualsLiteral("sans-serif") ||
family.LowerCaseEqualsLiteral("monospace") ||
family.LowerCaseEqualsLiteral("cursive") ||
family.LowerCaseEqualsLiteral("fantasy")))
{
generic = true;
ToLowerCase(NS_LossyConvertUTF16toASCII(family), lcFamily);
nsAutoCString prefName("font.name.");
prefName.Append(lcFamily);
prefName.AppendLiteral(".");
prefName.Append(groupString);
nsAdoptingString value = Preferences::GetString(prefName.get());
if (value) {
CopyASCIItoUTF16(lcFamily, genericFamily);
family = value;
}
} else {
generic = false;
genericFamily.SetIsVoid(true);
}
}
NS_LossyConvertUTF16toASCII gf(genericFamily);
if (generic) {
ForEachFontInternal(family, groupAtom, false,
aResolveFontName, false,
fc, closure);
} else if (!family.IsEmpty()) {
if (aResolveFontName) {
ResolveData data(fc, gf, aUseFontSet, closure);
bool aborted = false, needsBold;
nsresult rv = NS_OK;
bool foundFamily = false;
bool waitForUserFont = false;
gfxFontEntry *fe = nullptr;
if (aUseFontSet && mUserFontSet) {
gfxFontFamily *fam = mUserFontSet->GetFamily(family);
if (fam) {
fe = mUserFontSet->FindFontEntry(fam, mStyle,
needsBold,
waitForUserFont);
}
}
if (fe) {
gfxFontGroup::FontResolverProc(family, &data);
} else {
if (waitForUserFont) {
mSkipDrawing = true;
}
if (!foundFamily) {
gfxPlatform *pf = gfxPlatform::GetPlatform();
rv = pf->ResolveFontName(family,
gfxFontGroup::FontResolverProc,
&data, aborted);
}
}
if (NS_FAILED(rv) || aborted)
return false;
}
else {
if (!fc(family, gf, aUseFontSet, closure))
return false;
}
}
if (generic && aResolveGeneric) {
nsAutoCString prefName("font.name-list.");
prefName.Append(lcFamily);
prefName.AppendLiteral(".");
prefName.Append(groupString);
nsAdoptingString value = Preferences::GetString(prefName.get());
if (value) {
ForEachFontInternal(value, groupAtom, false,
aResolveFontName, false,
fc, closure);
}
}
++p; // may advance past p_end
}
return true;
}
bool
gfxFontGroup::FontResolverProc(const nsAString& aName, void *aClosure)
{
ResolveData *data = reinterpret_cast<ResolveData*>(aClosure);
return (data->mCallback)(aName, data->mGenericFamily, data->mUseFontSet,
data->mClosure);
}
gfxTextRun *
gfxFontGroup::MakeEmptyTextRun(const Parameters *aParams, uint32_t aFlags)
{
aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT;
return gfxTextRun::Create(aParams, 0, this, aFlags);
}
gfxTextRun *
gfxFontGroup::MakeSpaceTextRun(const Parameters *aParams, uint32_t aFlags)
{
aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT;
gfxTextRun *textRun = gfxTextRun::Create(aParams, 1, this, aFlags);
if (!textRun) {
return nullptr;
}
gfxFont *font = GetFontAt(0);
if (MOZ_UNLIKELY(GetStyle()->size == 0)) {
// Short-circuit for size-0 fonts, as Windows and ATSUI can't handle
// them, and always create at least size 1 fonts, i.e. they still
// render something for size 0 fonts.
textRun->AddGlyphRun(font, gfxTextRange::kFontGroup, 0, false);
}
else {
if (font->GetSpaceGlyph()) {
// Normally, the font has a cached space glyph, so we can avoid
// the cost of calling FindFontForChar.
textRun->SetSpaceGlyph(font, aParams->mContext, 0);
} else {
// In case the primary font doesn't have <space> (bug 970891),
// find one that does.
uint8_t matchType;
nsRefPtr<gfxFont> spaceFont =
FindFontForChar(' ', 0, MOZ_SCRIPT_LATIN, nullptr, &matchType);
if (spaceFont) {
textRun->SetSpaceGlyph(spaceFont, aParams->mContext, 0);
}
}
}
// Note that the gfxGlyphExtents glyph bounds storage for the font will
// always contain an entry for the font's space glyph, so we don't have
// to call FetchGlyphExtents here.
return textRun;
}
gfxTextRun *
gfxFontGroup::MakeBlankTextRun(uint32_t aLength,
const Parameters *aParams, uint32_t aFlags)
{
gfxTextRun *textRun =
gfxTextRun::Create(aParams, aLength, this, aFlags);
if (!textRun) {
return nullptr;
}
textRun->AddGlyphRun(GetFontAt(0), gfxTextRange::kFontGroup, 0, false);
return textRun;
}
gfxTextRun *
gfxFontGroup::MakeHyphenTextRun(gfxContext *aCtx, uint32_t aAppUnitsPerDevUnit)
{
// only use U+2010 if it is supported by the first font in the group;
// it's better to use ASCII '-' from the primary font than to fall back to
// U+2010 from some other, possibly poorly-matching face
static const char16_t hyphen = 0x2010;
gfxFont *font = GetFontAt(0);
if (font && font->HasCharacter(hyphen)) {
return MakeTextRun(&hyphen, 1, aCtx, aAppUnitsPerDevUnit,
gfxFontGroup::TEXT_IS_PERSISTENT);
}
static const uint8_t dash = '-';
return MakeTextRun(&dash, 1, aCtx, aAppUnitsPerDevUnit,
gfxFontGroup::TEXT_IS_PERSISTENT);
}
gfxFloat
gfxFontGroup::GetHyphenWidth(gfxTextRun::PropertyProvider *aProvider)
{
if (mHyphenWidth < 0) {
nsRefPtr<gfxContext> ctx(aProvider->GetContext());
if (ctx) {
nsAutoPtr<gfxTextRun>
hyphRun(MakeHyphenTextRun(ctx,
aProvider->GetAppUnitsPerDevUnit()));
mHyphenWidth = hyphRun.get() ?
hyphRun->GetAdvanceWidth(0, hyphRun->GetLength(), nullptr) : 0;
}
}
return mHyphenWidth;
}
gfxTextRun *
gfxFontGroup::MakeTextRun(const uint8_t *aString, uint32_t aLength,
const Parameters *aParams, uint32_t aFlags)
{
if (aLength == 0) {
return MakeEmptyTextRun(aParams, aFlags);
}
if (aLength == 1 && aString[0] == ' ') {
return MakeSpaceTextRun(aParams, aFlags);
}
aFlags |= TEXT_IS_8BIT;
if (GetStyle()->size == 0) {
// Short-circuit for size-0 fonts, as Windows and ATSUI can't handle
// them, and always create at least size 1 fonts, i.e. they still
// render something for size 0 fonts.
return MakeBlankTextRun(aLength, aParams, aFlags);
}
gfxTextRun *textRun = gfxTextRun::Create(aParams, aLength,
this, aFlags);
if (!textRun) {
return nullptr;
}
InitTextRun(aParams->mContext, textRun, aString, aLength);
textRun->FetchGlyphExtents(aParams->mContext);
return textRun;
}
gfxTextRun *
gfxFontGroup::MakeTextRun(const char16_t *aString, uint32_t aLength,
const Parameters *aParams, uint32_t aFlags)
{
if (aLength == 0) {
return MakeEmptyTextRun(aParams, aFlags);
}
if (aLength == 1 && aString[0] == ' ') {
return MakeSpaceTextRun(aParams, aFlags);
}
if (GetStyle()->size == 0) {
return MakeBlankTextRun(aLength, aParams, aFlags);
}
gfxTextRun *textRun = gfxTextRun::Create(aParams, aLength,
this, aFlags);
if (!textRun) {
return nullptr;
}
InitTextRun(aParams->mContext, textRun, aString, aLength);
textRun->FetchGlyphExtents(aParams->mContext);
return textRun;
}
template<typename T>
void
gfxFontGroup::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const T *aString,
uint32_t aLength)
{
NS_ASSERTION(aLength > 0, "don't call InitTextRun for a zero-length run");
// we need to do numeral processing even on 8-bit text,
// in case we're converting Western to Hindi/Arabic digits
int32_t numOption = gfxPlatform::GetPlatform()->GetBidiNumeralOption();
nsAutoArrayPtr<char16_t> transformedString;
if (numOption != IBMBIDI_NUMERAL_NOMINAL) {
// scan the string for numerals that may need to be transformed;
// if we find any, we'll make a local copy here and use that for
// font matching and glyph generation/shaping
bool prevIsArabic =
(aTextRun->GetFlags() & gfxTextRunFactory::TEXT_INCOMING_ARABICCHAR) != 0;
for (uint32_t i = 0; i < aLength; ++i) {
char16_t origCh = aString[i];
char16_t newCh = HandleNumberInChar(origCh, prevIsArabic, numOption);
if (newCh != origCh) {
if (!transformedString) {
transformedString = new char16_t[aLength];
if (sizeof(T) == sizeof(char16_t)) {
memcpy(transformedString.get(), aString, i * sizeof(char16_t));
} else {
for (uint32_t j = 0; j < i; ++j) {
transformedString[j] = aString[j];
}
}
}
}
if (transformedString) {
transformedString[i] = newCh;
}
prevIsArabic = IS_ARABIC_CHAR(newCh);
}
}
#ifdef PR_LOGGING
PRLogModuleInfo *log = (mStyle.systemFont ?
gfxPlatform::GetLog(eGfxLog_textrunui) :
gfxPlatform::GetLog(eGfxLog_textrun));
#endif
if (sizeof(T) == sizeof(uint8_t) && !transformedString) {
#ifdef PR_LOGGING
if (MOZ_UNLIKELY(log)) {
nsAutoCString lang;
mStyle.language->ToUTF8String(lang);
nsAutoCString str((const char*)aString, aLength);
PR_LOG(log, PR_LOG_WARNING,\
("(%s) fontgroup: [%s] lang: %s script: %d len %d "
"weight: %d width: %d style: %s size: %6.2f %d-byte "
"TEXTRUN [%s] ENDTEXTRUN\n",
(mStyle.systemFont ? "textrunui" : "textrun"),
NS_ConvertUTF16toUTF8(mFamilies).get(),
lang.get(), MOZ_SCRIPT_LATIN, aLength,
uint32_t(mStyle.weight), uint32_t(mStyle.stretch),
(mStyle.style & NS_FONT_STYLE_ITALIC ? "italic" :
(mStyle.style & NS_FONT_STYLE_OBLIQUE ? "oblique" :
"normal")),
mStyle.size,
sizeof(T),
str.get()));
}
#endif
// the text is still purely 8-bit; bypass the script-run itemizer
// and treat it as a single Latin run
InitScriptRun(aContext, aTextRun, aString,
0, aLength, MOZ_SCRIPT_LATIN);
} else {
const char16_t *textPtr;
if (transformedString) {
textPtr = transformedString.get();
} else {
// typecast to avoid compilation error for the 8-bit version,
// even though this is dead code in that case
textPtr = reinterpret_cast<const char16_t*>(aString);
}
// split into script runs so that script can potentially influence
// the font matching process below
gfxScriptItemizer scriptRuns(textPtr, aLength);
uint32_t runStart = 0, runLimit = aLength;
int32_t runScript = MOZ_SCRIPT_LATIN;
while (scriptRuns.Next(runStart, runLimit, runScript)) {
#ifdef PR_LOGGING
if (MOZ_UNLIKELY(log)) {
nsAutoCString lang;
mStyle.language->ToUTF8String(lang);
uint32_t runLen = runLimit - runStart;
PR_LOG(log, PR_LOG_WARNING,\
("(%s) fontgroup: [%s] lang: %s script: %d len %d "
"weight: %d width: %d style: %s size: %6.2f %d-byte "
"TEXTRUN [%s] ENDTEXTRUN\n",
(mStyle.systemFont ? "textrunui" : "textrun"),
NS_ConvertUTF16toUTF8(mFamilies).get(),
lang.get(), runScript, runLen,
uint32_t(mStyle.weight), uint32_t(mStyle.stretch),
(mStyle.style & NS_FONT_STYLE_ITALIC ? "italic" :
(mStyle.style & NS_FONT_STYLE_OBLIQUE ? "oblique" :
"normal")),
mStyle.size,
sizeof(T),
NS_ConvertUTF16toUTF8(textPtr + runStart, runLen).get()));
}
#endif
InitScriptRun(aContext, aTextRun, textPtr,
runStart, runLimit, runScript);
}
}
if (sizeof(T) == sizeof(char16_t) && aLength > 0) {
gfxTextRun::CompressedGlyph *glyph = aTextRun->GetCharacterGlyphs();
if (!glyph->IsSimpleGlyph()) {
glyph->SetClusterStart(true);
}
}
// It's possible for CoreText to omit glyph runs if it decides they contain
// only invisibles (e.g., U+FEFF, see reftest 474417-1). In this case, we
// need to eliminate them from the glyph run array to avoid drawing "partial
// ligatures" with the wrong font.
// We don't do this during InitScriptRun (or gfxFont::InitTextRun) because
// it will iterate back over all glyphruns in the textrun, which leads to
// pathologically-bad perf in the case where a textrun contains many script
// changes (see bug 680402) - we'd end up re-sanitizing all the earlier runs
// every time a new script subrun is processed.
aTextRun->SanitizeGlyphRuns();
aTextRun->SortGlyphRuns();
}
template<typename T>
void
gfxFontGroup::InitScriptRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const T *aString,
uint32_t aScriptRunStart,
uint32_t aScriptRunEnd,
int32_t aRunScript)
{
NS_ASSERTION(aScriptRunEnd > aScriptRunStart,
"don't call InitScriptRun for a zero-length run");
gfxFont *mainFont = GetFontAt(0);
uint32_t runStart = aScriptRunStart;
nsAutoTArray<gfxTextRange,3> fontRanges;
ComputeRanges(fontRanges, aString + aScriptRunStart,
aScriptRunEnd - aScriptRunStart, aRunScript);
uint32_t numRanges = fontRanges.Length();
for (uint32_t r = 0; r < numRanges; r++) {
const gfxTextRange& range = fontRanges[r];
uint32_t matchedLength = range.Length();
gfxFont *matchedFont = range.font;
// create the glyph run for this range
if (matchedFont) {
aTextRun->AddGlyphRun(matchedFont, range.matchType,
runStart, (matchedLength > 0));
// do glyph layout and record the resulting positioned glyphs
if (!matchedFont->SplitAndInitTextRun(aContext, aTextRun, aString,
runStart, matchedLength,
aRunScript)) {
// glyph layout failed! treat as missing glyphs
matchedFont = nullptr;
}
} else {
aTextRun->AddGlyphRun(mainFont, gfxTextRange::kFontGroup,
runStart, (matchedLength > 0));
}
if (!matchedFont) {
// We need to set cluster boundaries (and mark spaces) so that
// surrogate pairs, combining characters, etc behave properly,
// even if we don't have glyphs for them
aTextRun->SetupClusterBoundaries(runStart, aString + runStart,
matchedLength);
// various "missing" characters may need special handling,
// so we check for them here
uint32_t runLimit = runStart + matchedLength;
for (uint32_t index = runStart; index < runLimit; index++) {
T ch = aString[index];
// tab and newline are not to be displayed as hexboxes,
// but do need to be recorded in the textrun
if (ch == '\n') {
aTextRun->SetIsNewline(index);
continue;
}
if (ch == '\t') {
aTextRun->SetIsTab(index);
continue;
}
// for 16-bit textruns only, check for surrogate pairs and
// special Unicode spaces; omit these checks in 8-bit runs
if (sizeof(T) == sizeof(char16_t)) {
if (NS_IS_HIGH_SURROGATE(ch) &&
index + 1 < aScriptRunEnd &&
NS_IS_LOW_SURROGATE(aString[index + 1]))
{
aTextRun->SetMissingGlyph(index,
SURROGATE_TO_UCS4(ch,
aString[index + 1]),
mainFont);
index++;
continue;
}
// check if this is a known Unicode whitespace character that
// we can render using the space glyph with a custom width
gfxFloat wid = mainFont->SynthesizeSpaceWidth(ch);
if (wid >= 0.0) {
nscoord advance =
aTextRun->GetAppUnitsPerDevUnit() * floor(wid + 0.5);
if (gfxShapedText::CompressedGlyph::IsSimpleAdvance(advance)) {
aTextRun->GetCharacterGlyphs()[index].
SetSimpleGlyph(advance,
mainFont->GetSpaceGlyph());
} else {
gfxTextRun::DetailedGlyph detailedGlyph;
detailedGlyph.mGlyphID = mainFont->GetSpaceGlyph();
detailedGlyph.mAdvance = advance;
detailedGlyph.mXOffset = detailedGlyph.mYOffset = 0;
gfxShapedText::CompressedGlyph g;
g.SetComplex(true, true, 1);
aTextRun->SetGlyphs(index,
g, &detailedGlyph);
}
continue;
}
}
if (IsInvalidChar(ch)) {
// invalid chars are left as zero-width/invisible
continue;
}
// record char code so we can draw a box with the Unicode value
aTextRun->SetMissingGlyph(index, ch, mainFont);
}
}
runStart += matchedLength;
}
}
gfxTextRun *
gfxFontGroup::GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel,
LazyReferenceContextGetter& aRefContextGetter)
{
if (mCachedEllipsisTextRun &&
mCachedEllipsisTextRun->GetAppUnitsPerDevUnit() == aAppUnitsPerDevPixel) {
return mCachedEllipsisTextRun;
}
// Use a Unicode ellipsis if the font supports it,
// otherwise use three ASCII periods as fallback.
gfxFont* firstFont = GetFontAt(0);
nsString ellipsis = firstFont->HasCharacter(kEllipsisChar[0])
? nsDependentString(kEllipsisChar,
ArrayLength(kEllipsisChar) - 1)
: nsDependentString(kASCIIPeriodsChar,
ArrayLength(kASCIIPeriodsChar) - 1);
nsRefPtr<gfxContext> refCtx = aRefContextGetter.GetRefContext();
Parameters params = {
refCtx, nullptr, nullptr, nullptr, 0, aAppUnitsPerDevPixel
};
gfxTextRun* textRun =
MakeTextRun(ellipsis.get(), ellipsis.Length(), &params, TEXT_IS_PERSISTENT);
if (!textRun) {
return nullptr;
}
mCachedEllipsisTextRun = textRun;
textRun->ReleaseFontGroup(); // don't let the presence of a cached ellipsis
// textrun prolong the fontgroup's life
return textRun;
}
already_AddRefed<gfxFont>
gfxFontGroup::TryAllFamilyMembers(gfxFontFamily* aFamily, uint32_t aCh)
{
if (!aFamily->TestCharacterMap(aCh)) {
return nullptr;
}
// Note that we don't need the actual runScript in matchData for
// gfxFontFamily::SearchAllFontsForChar, it's only used for the
// system-fallback case. So we can just set it to 0 here.
GlobalFontMatch matchData(aCh, 0, &mStyle);
aFamily->SearchAllFontsForChar(&matchData);
gfxFontEntry *fe = matchData.mBestMatch;
if (!fe) {
return nullptr;
}
bool needsBold = mStyle.weight >= 600 && !fe->IsBold();
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&mStyle, needsBold);
return font.forget();
}
already_AddRefed<gfxFont>
gfxFontGroup::FindFontForChar(uint32_t aCh, uint32_t aPrevCh,
int32_t aRunScript, gfxFont *aPrevMatchedFont,
uint8_t *aMatchType)
{
// To optimize common cases, try the first font in the font-group
// before going into the more detailed checks below
uint32_t nextIndex = 0;
bool isJoinControl = gfxFontUtils::IsJoinControl(aCh);
bool wasJoinCauser = gfxFontUtils::IsJoinCauser(aPrevCh);
bool isVarSelector = gfxFontUtils::IsVarSelector(aCh);
if (!isJoinControl && !wasJoinCauser && !isVarSelector) {
nsRefPtr<gfxFont> firstFont = mFonts[0].Font();
if (firstFont->HasCharacter(aCh)) {
*aMatchType = gfxTextRange::kFontGroup;
return firstFont.forget();
}
// It's possible that another font in the family (e.g. regular face,
// where the requested style was italic) will support the character
nsRefPtr<gfxFont> font = TryAllFamilyMembers(mFonts[0].Family(), aCh);
if (font) {
*aMatchType = gfxTextRange::kFontGroup;
return font.forget();
}
// we don't need to check the first font again below
++nextIndex;
}
if (aPrevMatchedFont) {
// Don't switch fonts for control characters, regardless of
// whether they are present in the current font, as they won't
// actually be rendered (see bug 716229)
if (isJoinControl ||
GetGeneralCategory(aCh) == HB_UNICODE_GENERAL_CATEGORY_CONTROL) {
nsRefPtr<gfxFont> ret = aPrevMatchedFont;
return ret.forget();
}
// if previous character was a join-causer (ZWJ),
// use the same font as the previous range if we can
if (wasJoinCauser) {
if (aPrevMatchedFont->HasCharacter(aCh)) {
nsRefPtr<gfxFont> ret = aPrevMatchedFont;
return ret.forget();
}
}
}
// if this character is a variation selector,
// use the previous font regardless of whether it supports VS or not.
// otherwise the text run will be divided.
if (isVarSelector) {
if (aPrevMatchedFont) {
nsRefPtr<gfxFont> ret = aPrevMatchedFont;
return ret.forget();
}
// VS alone. it's meaningless to search different fonts
return nullptr;
}
// 1. check remaining fonts in the font group
uint32_t fontListLength = FontListLength();
for (uint32_t i = nextIndex; i < fontListLength; i++) {
nsRefPtr<gfxFont> font = mFonts[i].Font();
if (font->HasCharacter(aCh)) {
*aMatchType = gfxTextRange::kFontGroup;
return font.forget();
}
font = TryAllFamilyMembers(mFonts[i].Family(), aCh);
if (font) {
*aMatchType = gfxTextRange::kFontGroup;
return font.forget();
}
}
// if character is in Private Use Area, don't do matching against pref or system fonts
if ((aCh >= 0xE000 && aCh <= 0xF8FF) || (aCh >= 0xF0000 && aCh <= 0x10FFFD))
return nullptr;
// 2. search pref fonts
nsRefPtr<gfxFont> font = WhichPrefFontSupportsChar(aCh);
if (font) {
*aMatchType = gfxTextRange::kPrefsFallback;
return font.forget();
}
// 3. use fallback fonts
// -- before searching for something else check the font used for the previous character
if (aPrevMatchedFont && aPrevMatchedFont->HasCharacter(aCh)) {
*aMatchType = gfxTextRange::kSystemFallback;
nsRefPtr<gfxFont> ret = aPrevMatchedFont;
return ret.forget();
}
// never fall back for characters from unknown scripts
if (aRunScript == HB_SCRIPT_UNKNOWN) {
return nullptr;
}
// for known "space" characters, don't do a full system-fallback search;
// we'll synthesize appropriate-width spaces instead of missing-glyph boxes
if (GetGeneralCategory(aCh) ==
HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR &&
GetFontAt(0)->SynthesizeSpaceWidth(aCh) >= 0.0)
{
return nullptr;
}
// -- otherwise look for other stuff
*aMatchType = gfxTextRange::kSystemFallback;
font = WhichSystemFontSupportsChar(aCh, aRunScript);
return font.forget();
}
template<typename T>
void gfxFontGroup::ComputeRanges(nsTArray<gfxTextRange>& aRanges,
const T *aString, uint32_t aLength,
int32_t aRunScript)
{
NS_ASSERTION(aRanges.Length() == 0, "aRanges must be initially empty");
NS_ASSERTION(aLength > 0, "don't call ComputeRanges for zero-length text");
uint32_t prevCh = 0;
int32_t lastRangeIndex = -1;
// initialize prevFont to the group's primary font, so that this will be
// used for string-initial control chars, etc rather than risk hitting font
// fallback for these (bug 716229)
gfxFont *prevFont = GetFontAt(0);
// if we use the initial value of prevFont, we treat this as a match from
// the font group; fixes bug 978313
uint8_t matchType = gfxTextRange::kFontGroup;
for (uint32_t i = 0; i < aLength; i++) {
const uint32_t origI = i; // save off in case we increase for surrogate
// set up current ch
uint32_t ch = aString[i];
// in 16-bit case only, check for surrogate pair
if (sizeof(T) == sizeof(char16_t)) {
if ((i + 1 < aLength) && NS_IS_HIGH_SURROGATE(ch) &&
NS_IS_LOW_SURROGATE(aString[i + 1])) {
i++;
ch = SURROGATE_TO_UCS4(ch, aString[i]);
}
}
if (ch == 0xa0) {
ch = ' ';
}
// find the font for this char
nsRefPtr<gfxFont> font =
FindFontForChar(ch, prevCh, aRunScript, prevFont, &matchType);
#ifndef RELEASE_BUILD
if (MOZ_UNLIKELY(mTextPerf)) {
if (matchType == gfxTextRange::kPrefsFallback) {
mTextPerf->current.fallbackPrefs++;
} else if (matchType == gfxTextRange::kSystemFallback) {
mTextPerf->current.fallbackSystem++;
}
}
#endif
prevCh = ch;
if (lastRangeIndex == -1) {
// first char ==> make a new range
aRanges.AppendElement(gfxTextRange(0, 1, font, matchType));
lastRangeIndex++;
prevFont = font;
} else {
// if font has changed, make a new range
gfxTextRange& prevRange = aRanges[lastRangeIndex];
if (prevRange.font != font || prevRange.matchType != matchType) {
// close out the previous range
prevRange.end = origI;
aRanges.AppendElement(gfxTextRange(origI, i + 1,
font, matchType));
lastRangeIndex++;
// update prevFont for the next match, *unless* we switched
// fonts on a ZWJ, in which case propagating the changed font
// is probably not a good idea (see bug 619511)
if (sizeof(T) == sizeof(uint8_t) ||
!gfxFontUtils::IsJoinCauser(ch))
{
prevFont = font;
}
}
}
}
aRanges[lastRangeIndex].end = aLength;
}
gfxUserFontSet*
gfxFontGroup::GetUserFontSet()
{
return mUserFontSet;
}
void
gfxFontGroup::SetUserFontSet(gfxUserFontSet *aUserFontSet)
{
if (aUserFontSet == mUserFontSet) {
return;
}
mUserFontSet = aUserFontSet;
mCurrGeneration = GetGeneration() - 1;
UpdateFontList();
}
uint64_t
gfxFontGroup::GetGeneration()
{
if (!mUserFontSet)
return 0;
return mUserFontSet->GetGeneration();
}
void
gfxFontGroup::UpdateFontList()
{
if (mCurrGeneration != GetGeneration()) {
// xxx - can probably improve this to detect when all fonts were found, so no need to update list
mFonts.Clear();
mUnderlineOffset = UNDERLINE_OFFSET_NOT_SET;
mSkipDrawing = false;
// bug 548184 - need to clean up FT2, OS/2 platform code to use BuildFontList
#if defined(XP_MACOSX) || defined(XP_WIN) || defined(ANDROID)
BuildFontList();
#else
ForEachFont(FindPlatformFont, this);
#endif
mCurrGeneration = GetGeneration();
mCachedEllipsisTextRun = nullptr;
}
}
struct PrefFontCallbackData {
PrefFontCallbackData(nsTArray<nsRefPtr<gfxFontFamily> >& aFamiliesArray)
: mPrefFamilies(aFamiliesArray)
{}
nsTArray<nsRefPtr<gfxFontFamily> >& mPrefFamilies;
static bool AddFontFamilyEntry(eFontPrefLang aLang, const nsAString& aName, void *aClosure)
{
PrefFontCallbackData *prefFontData = static_cast<PrefFontCallbackData*>(aClosure);
gfxFontFamily *family = gfxPlatformFontList::PlatformFontList()->FindFamily(aName);
if (family) {
prefFontData->mPrefFamilies.AppendElement(family);
}
return true;
}
};
already_AddRefed<gfxFont>
gfxFontGroup::WhichPrefFontSupportsChar(uint32_t aCh)
{
nsRefPtr<gfxFont> font;
// get the pref font list if it hasn't been set up already
uint32_t unicodeRange = FindCharUnicodeRange(aCh);
eFontPrefLang charLang = gfxPlatform::GetPlatform()->GetFontPrefLangFor(unicodeRange);
// if the last pref font was the first family in the pref list, no need to recheck through a list of families
if (mLastPrefFont && charLang == mLastPrefLang &&
mLastPrefFirstFont && mLastPrefFont->HasCharacter(aCh)) {
font = mLastPrefFont;
return font.forget();
}
// based on char lang and page lang, set up list of pref lang fonts to check
eFontPrefLang prefLangs[kMaxLenPrefLangList];
uint32_t i, numLangs = 0;
gfxPlatform::GetPlatform()->GetLangPrefs(prefLangs, numLangs, charLang, mPageLang);
for (i = 0; i < numLangs; i++) {
nsAutoTArray<nsRefPtr<gfxFontFamily>, 5> families;
eFontPrefLang currentLang = prefLangs[i];
gfxPlatformFontList *fontList = gfxPlatformFontList::PlatformFontList();
// get the pref families for a single pref lang
if (!fontList->GetPrefFontFamilyEntries(currentLang, &families)) {
eFontPrefLang prefLangsToSearch[1] = { currentLang };
PrefFontCallbackData prefFontData(families);
gfxPlatform::ForEachPrefFont(prefLangsToSearch, 1, PrefFontCallbackData::AddFontFamilyEntry,
&prefFontData);
fontList->SetPrefFontFamilyEntries(currentLang, families);
}
// find the first pref font that includes the character
uint32_t j, numPrefs;
numPrefs = families.Length();
for (j = 0; j < numPrefs; j++) {
// look up the appropriate face
gfxFontFamily *family = families[j];
if (!family) continue;
// if a pref font is used, it's likely to be used again in the same text run.
// the style doesn't change so the face lookup can be cached rather than calling
// FindOrMakeFont repeatedly. speeds up FindFontForChar lookup times for subsequent
// pref font lookups
if (family == mLastPrefFamily && mLastPrefFont->HasCharacter(aCh)) {
font = mLastPrefFont;
return font.forget();
}
bool needsBold;
gfxFontEntry *fe = family->FindFontForStyle(mStyle, needsBold);
// if ch in cmap, create and return a gfxFont
if (fe && fe->TestCharacterMap(aCh)) {
nsRefPtr<gfxFont> prefFont = fe->FindOrMakeFont(&mStyle, needsBold);
if (!prefFont) continue;
mLastPrefFamily = family;
mLastPrefFont = prefFont;
mLastPrefLang = charLang;
mLastPrefFirstFont = (i == 0 && j == 0);
return prefFont.forget();
}
}
}
return nullptr;
}
already_AddRefed<gfxFont>
gfxFontGroup::WhichSystemFontSupportsChar(uint32_t aCh, int32_t aRunScript)
{
gfxFontEntry *fe =
gfxPlatformFontList::PlatformFontList()->
SystemFindFontForChar(aCh, aRunScript, &mStyle);
if (fe) {
bool wantBold = mStyle.ComputeWeight() >= 6;
nsRefPtr<gfxFont> font =
fe->FindOrMakeFont(&mStyle, wantBold && !fe->IsBold());
return font.forget();
}
return nullptr;
}
/*static*/ void
gfxFontGroup::Shutdown()
{
NS_IF_RELEASE(gLangService);
}
nsILanguageAtomService* gfxFontGroup::gLangService = nullptr;
#define DEFAULT_PIXEL_FONT_SIZE 16.0f
/*static*/ uint32_t
gfxFontStyle::ParseFontLanguageOverride(const nsString& aLangTag)
{
if (!aLangTag.Length() || aLangTag.Length() > 4) {
return NO_FONT_LANGUAGE_OVERRIDE;
}
uint32_t index, result = 0;
for (index = 0; index < aLangTag.Length(); ++index) {
char16_t ch = aLangTag[index];
if (!nsCRT::IsAscii(ch)) { // valid tags are pure ASCII
return NO_FONT_LANGUAGE_OVERRIDE;
}
result = (result << 8) + ch;
}
while (index++ < 4) {
result = (result << 8) + 0x20;
}
return result;
}
gfxFontStyle::gfxFontStyle() :
language(nsGkAtoms::x_western),
size(DEFAULT_PIXEL_FONT_SIZE), sizeAdjust(0.0f),
languageOverride(NO_FONT_LANGUAGE_OVERRIDE),
weight(NS_FONT_WEIGHT_NORMAL), stretch(NS_FONT_STRETCH_NORMAL),
systemFont(true), printerFont(false), useGrayscaleAntialiasing(false),
style(NS_FONT_STYLE_NORMAL)
{
}
gfxFontStyle::gfxFontStyle(uint8_t aStyle, uint16_t aWeight, int16_t aStretch,
gfxFloat aSize, nsIAtom *aLanguage,
float aSizeAdjust, bool aSystemFont,
bool aPrinterFont,
const nsString& aLanguageOverride):
language(aLanguage),
size(aSize), sizeAdjust(aSizeAdjust),
languageOverride(ParseFontLanguageOverride(aLanguageOverride)),
weight(aWeight), stretch(aStretch),
systemFont(aSystemFont), printerFont(aPrinterFont),
useGrayscaleAntialiasing(false), style(aStyle)
{
MOZ_ASSERT(!mozilla::IsNaN(size));
MOZ_ASSERT(!mozilla::IsNaN(sizeAdjust));
if (weight > 900)
weight = 900;
if (weight < 100)
weight = 100;
if (size >= FONT_MAX_SIZE) {
size = FONT_MAX_SIZE;
sizeAdjust = 0.0;
} else if (size < 0.0) {
NS_WARNING("negative font size");
size = 0.0;
}
if (!language) {
NS_WARNING("null language");
language = nsGkAtoms::x_western;
}
}
gfxFontStyle::gfxFontStyle(const gfxFontStyle& aStyle) :
language(aStyle.language),
featureValueLookup(aStyle.featureValueLookup),
size(aStyle.size), sizeAdjust(aStyle.sizeAdjust),
languageOverride(aStyle.languageOverride),
weight(aStyle.weight), stretch(aStyle.stretch),
systemFont(aStyle.systemFont), printerFont(aStyle.printerFont),
useGrayscaleAntialiasing(aStyle.useGrayscaleAntialiasing),
style(aStyle.style)
{
featureSettings.AppendElements(aStyle.featureSettings);
alternateValues.AppendElements(aStyle.alternateValues);
}
int8_t
gfxFontStyle::ComputeWeight() const
{
int8_t baseWeight = (weight + 50) / 100;
if (baseWeight < 0)
baseWeight = 0;
if (baseWeight > 9)
baseWeight = 9;
return baseWeight;
}
void
gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
const char16_t *aString,
uint32_t aLength)
{
CompressedGlyph *glyphs = GetCharacterGlyphs() + aOffset;
gfxTextRun::CompressedGlyph extendCluster;
extendCluster.SetComplex(false, true, 0);
ClusterIterator iter(aString, aLength);
// the ClusterIterator won't be able to tell us if the string
// _begins_ with a cluster-extender, so we handle that here
if (aLength && IsClusterExtender(*aString)) {
*glyphs = extendCluster;
}
while (!iter.AtEnd()) {
if (*iter == char16_t(' ')) {
glyphs->SetIsSpace();
}
// advance iter to the next cluster-start (or end of text)
iter.Next();
// step past the first char of the cluster
aString++;
glyphs++;
// mark all the rest as cluster-continuations
while (aString < iter) {
*glyphs = extendCluster;
if (NS_IS_LOW_SURROGATE(*aString)) {
glyphs->SetIsLowSurrogate();
}
glyphs++;
aString++;
}
}
}
void
gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
const uint8_t *aString,
uint32_t aLength)
{
CompressedGlyph *glyphs = GetCharacterGlyphs() + aOffset;
const uint8_t *limit = aString + aLength;
while (aString < limit) {
if (*aString == uint8_t(' ')) {
glyphs->SetIsSpace();
}
aString++;
glyphs++;
}
}
gfxShapedText::DetailedGlyph *
gfxShapedText::AllocateDetailedGlyphs(uint32_t aIndex, uint32_t aCount)
{
NS_ASSERTION(aIndex < GetLength(), "Index out of range");
if (!mDetailedGlyphs) {
mDetailedGlyphs = new DetailedGlyphStore();
}
DetailedGlyph *details = mDetailedGlyphs->Allocate(aIndex, aCount);
if (!details) {
GetCharacterGlyphs()[aIndex].SetMissing(0);
return nullptr;
}
return details;
}
void
gfxShapedText::SetGlyphs(uint32_t aIndex, CompressedGlyph aGlyph,
const DetailedGlyph *aGlyphs)
{
NS_ASSERTION(!aGlyph.IsSimpleGlyph(), "Simple glyphs not handled here");
NS_ASSERTION(aIndex > 0 || aGlyph.IsLigatureGroupStart(),
"First character can't be a ligature continuation!");
uint32_t glyphCount = aGlyph.GetGlyphCount();
if (glyphCount > 0) {
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, glyphCount);
if (!details) {
return;
}
memcpy(details, aGlyphs, sizeof(DetailedGlyph)*glyphCount);
}
GetCharacterGlyphs()[aIndex] = aGlyph;
}
#define ZWNJ 0x200C
#define ZWJ 0x200D
// U+061C ARABIC LETTER MARK is expected to be added to XIDMOD_DEFAULT_IGNORABLE
// in a future Unicode update. Add it manually for now
#define ALM 0x061C
static inline bool
IsDefaultIgnorable(uint32_t aChar)
{
return GetIdentifierModification(aChar) == XIDMOD_DEFAULT_IGNORABLE ||
aChar == ZWNJ || aChar == ZWJ || aChar == ALM;
}
void
gfxShapedText::SetMissingGlyph(uint32_t aIndex, uint32_t aChar, gfxFont *aFont)
{
uint8_t category = GetGeneralCategory(aChar);
if (category >= HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK &&
category <= HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
{
GetCharacterGlyphs()[aIndex].SetComplex(false, true, 0);
}
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
if (!details) {
return;
}
details->mGlyphID = aChar;
if (IsDefaultIgnorable(aChar)) {
// Setting advance width to zero will prevent drawing the hexbox
details->mAdvance = 0;
} else {
gfxFloat width =
std::max(aFont->GetMetrics().aveCharWidth,
gfxFontMissingGlyphs::GetDesiredMinWidth(aChar,
mAppUnitsPerDevUnit));
details->mAdvance = uint32_t(width * mAppUnitsPerDevUnit);
}
details->mXOffset = 0;
details->mYOffset = 0;
GetCharacterGlyphs()[aIndex].SetMissing(1);
}
bool
gfxShapedText::FilterIfIgnorable(uint32_t aIndex, uint32_t aCh)
{
if (IsDefaultIgnorable(aCh)) {
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
if (details) {
details->mGlyphID = aCh;
details->mAdvance = 0;
details->mXOffset = 0;
details->mYOffset = 0;
GetCharacterGlyphs()[aIndex].SetMissing(1);
return true;
}
}
return false;
}
void
gfxShapedText::AdjustAdvancesForSyntheticBold(float aSynBoldOffset,
uint32_t aOffset,
uint32_t aLength)
{
uint32_t synAppUnitOffset = aSynBoldOffset * mAppUnitsPerDevUnit;
CompressedGlyph *charGlyphs = GetCharacterGlyphs();
for (uint32_t i = aOffset; i < aOffset + aLength; ++i) {
CompressedGlyph *glyphData = charGlyphs + i;
if (glyphData->IsSimpleGlyph()) {
// simple glyphs ==> just add the advance
int32_t advance = glyphData->GetSimpleAdvance() + synAppUnitOffset;
if (CompressedGlyph::IsSimpleAdvance(advance)) {
glyphData->SetSimpleGlyph(advance, glyphData->GetSimpleGlyph());
} else {
// rare case, tested by making this the default
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
glyphData->SetComplex(true, true, 1);
DetailedGlyph detail = {glyphIndex, advance, 0, 0};
SetGlyphs(i, *glyphData, &detail);
}
} else {
// complex glyphs ==> add offset at cluster/ligature boundaries
uint32_t detailedLength = glyphData->GetGlyphCount();
if (detailedLength) {
DetailedGlyph *details = GetDetailedGlyphs(i);
if (!details) {
continue;
}
if (IsRightToLeft()) {
details[0].mAdvance += synAppUnitOffset;
} else {
details[detailedLength - 1].mAdvance += synAppUnitOffset;
}
}
}
}
}
bool
gfxTextRun::GlyphRunIterator::NextRun() {
if (mNextIndex >= mTextRun->mGlyphRuns.Length())
return false;
mGlyphRun = &mTextRun->mGlyphRuns[mNextIndex];
if (mGlyphRun->mCharacterOffset >= mEndOffset)
return false;
mStringStart = std::max(mStartOffset, mGlyphRun->mCharacterOffset);
uint32_t last = mNextIndex + 1 < mTextRun->mGlyphRuns.Length()
? mTextRun->mGlyphRuns[mNextIndex + 1].mCharacterOffset : mTextRun->GetLength();
mStringEnd = std::min(mEndOffset, last);
++mNextIndex;
return true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
static void
AccountStorageForTextRun(gfxTextRun *aTextRun, int32_t aSign)
{
// Ignores detailed glyphs... we don't know when those have been constructed
// Also ignores gfxSkipChars dynamic storage (which won't be anything
// for preformatted text)
// Also ignores GlyphRun array, again because it hasn't been constructed
// by the time this gets called. If there's only one glyphrun that's stored
// directly in the textrun anyway so no additional overhead.
uint32_t length = aTextRun->GetLength();
int32_t bytes = length * sizeof(gfxTextRun::CompressedGlyph);
bytes += sizeof(gfxTextRun);
gTextRunStorage += bytes*aSign;
gTextRunStorageHighWaterMark = std::max(gTextRunStorageHighWaterMark, gTextRunStorage);
}
#endif
// Helper for textRun creation to preallocate storage for glyph records;
// this function returns a pointer to the newly-allocated glyph storage.
// Returns nullptr if allocation fails.
void *
gfxTextRun::AllocateStorageForTextRun(size_t aSize, uint32_t aLength)
{
// Allocate the storage we need, returning nullptr on failure rather than
// throwing an exception (because web content can create huge runs).
void *storage = moz_malloc(aSize + aLength * sizeof(CompressedGlyph));
if (!storage) {
NS_WARNING("failed to allocate storage for text run!");
return nullptr;
}
// Initialize the glyph storage (beyond aSize) to zero
memset(reinterpret_cast<char*>(storage) + aSize, 0,
aLength * sizeof(CompressedGlyph));
return storage;
}
gfxTextRun *
gfxTextRun::Create(const gfxTextRunFactory::Parameters *aParams,
uint32_t aLength, gfxFontGroup *aFontGroup, uint32_t aFlags)
{
void *storage = AllocateStorageForTextRun(sizeof(gfxTextRun), aLength);
if (!storage) {
return nullptr;
}
return new (storage) gfxTextRun(aParams, aLength, aFontGroup, aFlags);
}
gfxTextRun::gfxTextRun(const gfxTextRunFactory::Parameters *aParams,
uint32_t aLength, gfxFontGroup *aFontGroup, uint32_t aFlags)
: gfxShapedText(aLength, aFlags, aParams->mAppUnitsPerDevUnit)
, mUserData(aParams->mUserData)
, mFontGroup(aFontGroup)
, mReleasedFontGroup(false)
{
NS_ASSERTION(mAppUnitsPerDevUnit > 0, "Invalid app unit scale");
MOZ_COUNT_CTOR(gfxTextRun);
NS_ADDREF(mFontGroup);
#ifndef RELEASE_BUILD
gfxTextPerfMetrics *tp = aFontGroup->GetTextPerfMetrics();
if (tp) {
tp->current.textrunConst++;
}
#endif
mCharacterGlyphs = reinterpret_cast<CompressedGlyph*>(this + 1);
if (aParams->mSkipChars) {
mSkipChars.TakeFrom(aParams->mSkipChars);
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
AccountStorageForTextRun(this, 1);
#endif
mSkipDrawing = mFontGroup->ShouldSkipDrawing();
}
gfxTextRun::~gfxTextRun()
{
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
AccountStorageForTextRun(this, -1);
#endif
#ifdef DEBUG
// Make it easy to detect a dead text run
mFlags = 0xFFFFFFFF;
#endif
// The cached ellipsis textrun (if any) in a fontgroup will have already
// been told to release its reference to the group, so we mustn't do that
// again here.
if (!mReleasedFontGroup) {
#ifndef RELEASE_BUILD
gfxTextPerfMetrics *tp = mFontGroup->GetTextPerfMetrics();
if (tp) {
tp->current.textrunDestr++;
}
#endif
NS_RELEASE(mFontGroup);
}
MOZ_COUNT_DTOR(gfxTextRun);
}
void
gfxTextRun::ReleaseFontGroup()
{
NS_ASSERTION(!mReleasedFontGroup, "doubly released!");
NS_RELEASE(mFontGroup);
mReleasedFontGroup = true;
}
bool
gfxTextRun::SetPotentialLineBreaks(uint32_t aStart, uint32_t aLength,
uint8_t *aBreakBefore,
gfxContext *aRefContext)
{
NS_ASSERTION(aStart + aLength <= GetLength(), "Overflow");
uint32_t changed = 0;
uint32_t i;
CompressedGlyph *charGlyphs = mCharacterGlyphs + aStart;
for (i = 0; i < aLength; ++i) {
uint8_t canBreak = aBreakBefore[i];
if (canBreak && !charGlyphs[i].IsClusterStart()) {
// This can happen ... there is no guarantee that our linebreaking rules
// align with the platform's idea of what constitutes a cluster.
NS_WARNING("Break suggested inside cluster!");
canBreak = CompressedGlyph::FLAG_BREAK_TYPE_NONE;
}
changed |= charGlyphs[i].SetCanBreakBefore(canBreak);
}
return changed != 0;
}
gfxTextRun::LigatureData
gfxTextRun::ComputeLigatureData(uint32_t aPartStart, uint32_t aPartEnd,
PropertyProvider *aProvider)
{
NS_ASSERTION(aPartStart < aPartEnd, "Computing ligature data for empty range");
NS_ASSERTION(aPartEnd <= GetLength(), "Character length overflow");
LigatureData result;
CompressedGlyph *charGlyphs = mCharacterGlyphs;
uint32_t i;
for (i = aPartStart; !charGlyphs[i].IsLigatureGroupStart(); --i) {
NS_ASSERTION(i > 0, "Ligature at the start of the run??");
}
result.mLigatureStart = i;
for (i = aPartStart + 1; i < GetLength() && !charGlyphs[i].IsLigatureGroupStart(); ++i) {
}
result.mLigatureEnd = i;
int32_t ligatureWidth =
GetAdvanceForGlyphs(result.mLigatureStart, result.mLigatureEnd);
// Count the number of started clusters we have seen
uint32_t totalClusterCount = 0;
uint32_t partClusterIndex = 0;
uint32_t partClusterCount = 0;
for (i = result.mLigatureStart; i < result.mLigatureEnd; ++i) {
// Treat the first character of the ligature as the start of a
// cluster for our purposes of allocating ligature width to its
// characters.
if (i == result.mLigatureStart || charGlyphs[i].IsClusterStart()) {
++totalClusterCount;
if (i < aPartStart) {
++partClusterIndex;
} else if (i < aPartEnd) {
++partClusterCount;
}
}
}
NS_ASSERTION(totalClusterCount > 0, "Ligature involving no clusters??");
result.mPartAdvance = partClusterIndex * (ligatureWidth / totalClusterCount);
result.mPartWidth = partClusterCount * (ligatureWidth / totalClusterCount);
// Any rounding errors are apportioned to the final part of the ligature,
// so that measuring all parts of a ligature and summing them is equal to
// the ligature width.
if (aPartEnd == result.mLigatureEnd) {
gfxFloat allParts = totalClusterCount * (ligatureWidth / totalClusterCount);
result.mPartWidth += ligatureWidth - allParts;
}
if (partClusterCount == 0) {
// nothing to draw
result.mClipBeforePart = result.mClipAfterPart = true;
} else {
// Determine whether we should clip before or after this part when
// drawing its slice of the ligature.
// We need to clip before the part if any cluster is drawn before
// this part.
result.mClipBeforePart = partClusterIndex > 0;
// We need to clip after the part if any cluster is drawn after
// this part.
result.mClipAfterPart = partClusterIndex + partClusterCount < totalClusterCount;
}
if (aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING)) {
gfxFont::Spacing spacing;
if (aPartStart == result.mLigatureStart) {
aProvider->GetSpacing(aPartStart, 1, &spacing);
result.mPartWidth += spacing.mBefore;
}
if (aPartEnd == result.mLigatureEnd) {
aProvider->GetSpacing(aPartEnd - 1, 1, &spacing);
result.mPartWidth += spacing.mAfter;
}
}
return result;
}
gfxFloat
gfxTextRun::ComputePartialLigatureWidth(uint32_t aPartStart, uint32_t aPartEnd,
PropertyProvider *aProvider)
{
if (aPartStart >= aPartEnd)
return 0;
LigatureData data = ComputeLigatureData(aPartStart, aPartEnd, aProvider);
return data.mPartWidth;
}
int32_t
gfxTextRun::GetAdvanceForGlyphs(uint32_t aStart, uint32_t aEnd)
{
const CompressedGlyph *glyphData = mCharacterGlyphs + aStart;
int32_t advance = 0;
uint32_t i;
for (i = aStart; i < aEnd; ++i, ++glyphData) {
if (glyphData->IsSimpleGlyph()) {
advance += glyphData->GetSimpleAdvance();
} else {
uint32_t glyphCount = glyphData->GetGlyphCount();
if (glyphCount == 0) {
continue;
}
const DetailedGlyph *details = GetDetailedGlyphs(i);
if (details) {
uint32_t j;
for (j = 0; j < glyphCount; ++j, ++details) {
advance += details->mAdvance;
}
}
}
}
return advance;
}
static void
GetAdjustedSpacing(gfxTextRun *aTextRun, uint32_t aStart, uint32_t aEnd,
gfxTextRun::PropertyProvider *aProvider,
gfxTextRun::PropertyProvider::Spacing *aSpacing)
{
if (aStart >= aEnd)
return;
aProvider->GetSpacing(aStart, aEnd - aStart, aSpacing);
#ifdef DEBUG
// Check to see if we have spacing inside ligatures
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
uint32_t i;
for (i = aStart; i < aEnd; ++i) {
if (!charGlyphs[i].IsLigatureGroupStart()) {
NS_ASSERTION(i == aStart || aSpacing[i - aStart].mBefore == 0,
"Before-spacing inside a ligature!");
NS_ASSERTION(i - 1 <= aStart || aSpacing[i - 1 - aStart].mAfter == 0,
"After-spacing inside a ligature!");
}
}
#endif
}
bool
gfxTextRun::GetAdjustedSpacingArray(uint32_t aStart, uint32_t aEnd,
PropertyProvider *aProvider,
uint32_t aSpacingStart, uint32_t aSpacingEnd,
nsTArray<PropertyProvider::Spacing> *aSpacing)
{
if (!aProvider || !(mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING))
return false;
if (!aSpacing->AppendElements(aEnd - aStart))
return false;
memset(aSpacing->Elements(), 0, sizeof(gfxFont::Spacing)*(aSpacingStart - aStart));
GetAdjustedSpacing(this, aSpacingStart, aSpacingEnd, aProvider,
aSpacing->Elements() + aSpacingStart - aStart);
memset(aSpacing->Elements() + aSpacingEnd - aStart, 0, sizeof(gfxFont::Spacing)*(aEnd - aSpacingEnd));
return true;
}
void
gfxTextRun::ShrinkToLigatureBoundaries(uint32_t *aStart, uint32_t *aEnd)
{
if (*aStart >= *aEnd)
return;
CompressedGlyph *charGlyphs = mCharacterGlyphs;
while (*aStart < *aEnd && !charGlyphs[*aStart].IsLigatureGroupStart()) {
++(*aStart);
}
if (*aEnd < GetLength()) {
while (*aEnd > *aStart && !charGlyphs[*aEnd].IsLigatureGroupStart()) {
--(*aEnd);
}
}
}
void
gfxTextRun::DrawGlyphs(gfxFont *aFont, gfxContext *aContext,
DrawMode aDrawMode, gfxPoint *aPt,
gfxTextContextPaint *aContextPaint,
uint32_t aStart, uint32_t aEnd,
PropertyProvider *aProvider,
uint32_t aSpacingStart, uint32_t aSpacingEnd,
gfxTextRunDrawCallbacks *aCallbacks)
{
nsAutoTArray<PropertyProvider::Spacing,200> spacingBuffer;
bool haveSpacing = GetAdjustedSpacingArray(aStart, aEnd, aProvider,
aSpacingStart, aSpacingEnd, &spacingBuffer);
aFont->Draw(this, aStart, aEnd, aContext, aDrawMode, aPt,
haveSpacing ? spacingBuffer.Elements() : nullptr, aContextPaint,
aCallbacks);
}
static void
ClipPartialLigature(gfxTextRun *aTextRun, gfxFloat *aLeft, gfxFloat *aRight,
gfxFloat aXOrigin, gfxTextRun::LigatureData *aLigature)
{
if (aLigature->mClipBeforePart) {
if (aTextRun->IsRightToLeft()) {
*aRight = std::min(*aRight, aXOrigin);
} else {
*aLeft = std::max(*aLeft, aXOrigin);
}
}
if (aLigature->mClipAfterPart) {
gfxFloat endEdge = aXOrigin + aTextRun->GetDirection()*aLigature->mPartWidth;
if (aTextRun->IsRightToLeft()) {
*aLeft = std::max(*aLeft, endEdge);
} else {
*aRight = std::min(*aRight, endEdge);
}
}
}
void
gfxTextRun::DrawPartialLigature(gfxFont *aFont, gfxContext *aCtx,
uint32_t aStart, uint32_t aEnd,
gfxPoint *aPt,
PropertyProvider *aProvider,
gfxTextRunDrawCallbacks *aCallbacks)
{
if (aStart >= aEnd)
return;
// Draw partial ligature. We hack this by clipping the ligature.
LigatureData data = ComputeLigatureData(aStart, aEnd, aProvider);
gfxRect clipExtents = aCtx->GetClipExtents();
gfxFloat left = clipExtents.X()*mAppUnitsPerDevUnit;
gfxFloat right = clipExtents.XMost()*mAppUnitsPerDevUnit;
ClipPartialLigature(this, &left, &right, aPt->x, &data);
{
// Need to preserve the path, otherwise this can break canvas text-on-path;
// in general it seems like a good thing, as naive callers probably won't
// expect gfxTextRun::Draw to implicitly destroy the current path.
gfxContextPathAutoSaveRestore savePath(aCtx);
// use division here to ensure that when the rect is aligned on multiples
// of mAppUnitsPerDevUnit, we clip to true device unit boundaries.
// Also, make sure we snap the rectangle to device pixels.
aCtx->Save();
aCtx->NewPath();
aCtx->Rectangle(gfxRect(left / mAppUnitsPerDevUnit,
clipExtents.Y(),
(right - left) / mAppUnitsPerDevUnit,
clipExtents.Height()), true);
aCtx->Clip();
}
gfxFloat direction = GetDirection();
gfxPoint pt(aPt->x - direction*data.mPartAdvance, aPt->y);
DrawGlyphs(aFont, aCtx,
aCallbacks ? DrawMode::GLYPH_PATH : DrawMode::GLYPH_FILL, &pt,
nullptr, data.mLigatureStart, data.mLigatureEnd, aProvider,
aStart, aEnd, aCallbacks);
aCtx->Restore();
aPt->x += direction*data.mPartWidth;
}
// returns true if a glyph run is using a font with synthetic bolding enabled, false otherwise
static bool
HasSyntheticBold(gfxTextRun *aRun, uint32_t aStart, uint32_t aLength)
{
gfxTextRun::GlyphRunIterator iter(aRun, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
if (font && font->IsSyntheticBold()) {
return true;
}
}
return false;
}
// returns true if color is non-opaque (i.e. alpha != 1.0) or completely transparent, false otherwise
// if true, color is set on output
static bool
HasNonOpaqueColor(gfxContext *aContext, gfxRGBA& aCurrentColor)
{
if (aContext->GetDeviceColor(aCurrentColor)) {
if (aCurrentColor.a < 1.0 && aCurrentColor.a > 0.0) {
return true;
}
}
return false;
}
// helper class for double-buffering drawing with non-opaque color
struct BufferAlphaColor {
BufferAlphaColor(gfxContext *aContext)
: mContext(aContext)
{
}
~BufferAlphaColor() {}
void PushSolidColor(const gfxRect& aBounds, const gfxRGBA& aAlphaColor, uint32_t appsPerDevUnit)
{
mContext->Save();
mContext->NewPath();
mContext->Rectangle(gfxRect(aBounds.X() / appsPerDevUnit,
aBounds.Y() / appsPerDevUnit,
aBounds.Width() / appsPerDevUnit,
aBounds.Height() / appsPerDevUnit), true);
mContext->Clip();
mContext->SetColor(gfxRGBA(aAlphaColor.r, aAlphaColor.g, aAlphaColor.b));
mContext->PushGroup(gfxContentType::COLOR_ALPHA);
mAlpha = aAlphaColor.a;
}
void PopAlpha()
{
// pop the text, using the color alpha as the opacity
mContext->PopGroupToSource();
mContext->SetOperator(gfxContext::OPERATOR_OVER);
mContext->Paint(mAlpha);
mContext->Restore();
}
gfxContext *mContext;
gfxFloat mAlpha;
};
void
gfxTextRun::Draw(gfxContext *aContext, gfxPoint aPt, DrawMode aDrawMode,
uint32_t aStart, uint32_t aLength,
PropertyProvider *aProvider, gfxFloat *aAdvanceWidth,
gfxTextContextPaint *aContextPaint,
gfxTextRunDrawCallbacks *aCallbacks)
{
NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range");
NS_ASSERTION(aDrawMode == DrawMode::GLYPH_PATH || !(int(aDrawMode) & int(DrawMode::GLYPH_PATH)),
"GLYPH_PATH cannot be used with GLYPH_FILL, GLYPH_STROKE or GLYPH_STROKE_UNDERNEATH");
NS_ASSERTION(aDrawMode == DrawMode::GLYPH_PATH || !aCallbacks, "callback must not be specified unless using GLYPH_PATH");
bool skipDrawing = mSkipDrawing;
if (aDrawMode == DrawMode::GLYPH_FILL) {
gfxRGBA currentColor;
if (aContext->GetDeviceColor(currentColor) && currentColor.a == 0) {
skipDrawing = true;
}
}
gfxFloat direction = GetDirection();
if (skipDrawing) {
// We don't need to draw anything;
// but if the caller wants advance width, we need to compute it here
if (aAdvanceWidth) {
gfxTextRun::Metrics metrics = MeasureText(aStart, aLength,
gfxFont::LOOSE_INK_EXTENTS,
aContext, aProvider);
*aAdvanceWidth = metrics.mAdvanceWidth * direction;
}
// return without drawing
return;
}
gfxPoint pt = aPt;
// synthetic bolding draws glyphs twice ==> colors with opacity won't draw correctly unless first drawn without alpha
BufferAlphaColor syntheticBoldBuffer(aContext);
gfxRGBA currentColor;
bool needToRestore = false;
if (aDrawMode == DrawMode::GLYPH_FILL && HasNonOpaqueColor(aContext, currentColor)
&& HasSyntheticBold(this, aStart, aLength)) {
needToRestore = true;
// measure text, use the bounding box
gfxTextRun::Metrics metrics = MeasureText(aStart, aLength, gfxFont::LOOSE_INK_EXTENTS,
aContext, aProvider);
metrics.mBoundingBox.MoveBy(aPt);
syntheticBoldBuffer.PushSolidColor(metrics.mBoundingBox, currentColor, GetAppUnitsPerDevUnit());
}
GlyphRunIterator iter(this, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
uint32_t start = iter.GetStringStart();
uint32_t end = iter.GetStringEnd();
uint32_t ligatureRunStart = start;
uint32_t ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
bool drawPartial = aDrawMode == DrawMode::GLYPH_FILL ||
(aDrawMode == DrawMode::GLYPH_PATH && aCallbacks);
if (drawPartial) {
DrawPartialLigature(font, aContext, start, ligatureRunStart, &pt,
aProvider, aCallbacks);
}
DrawGlyphs(font, aContext, aDrawMode, &pt, aContextPaint, ligatureRunStart,
ligatureRunEnd, aProvider, ligatureRunStart, ligatureRunEnd,
aCallbacks);
if (drawPartial) {
DrawPartialLigature(font, aContext, ligatureRunEnd, end, &pt,
aProvider, aCallbacks);
}
}
// composite result when synthetic bolding used
if (needToRestore) {
syntheticBoldBuffer.PopAlpha();
}
if (aAdvanceWidth) {
*aAdvanceWidth = (pt.x - aPt.x)*direction;
}
}
void
gfxTextRun::AccumulateMetricsForRun(gfxFont *aFont,
uint32_t aStart, uint32_t aEnd,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
PropertyProvider *aProvider,
uint32_t aSpacingStart, uint32_t aSpacingEnd,
Metrics *aMetrics)
{
nsAutoTArray<PropertyProvider::Spacing,200> spacingBuffer;
bool haveSpacing = GetAdjustedSpacingArray(aStart, aEnd, aProvider,
aSpacingStart, aSpacingEnd, &spacingBuffer);
Metrics metrics = aFont->Measure(this, aStart, aEnd, aBoundingBoxType, aRefContext,
haveSpacing ? spacingBuffer.Elements() : nullptr);
aMetrics->CombineWith(metrics, IsRightToLeft());
}
void
gfxTextRun::AccumulatePartialLigatureMetrics(gfxFont *aFont,
uint32_t aStart, uint32_t aEnd,
gfxFont::BoundingBoxType aBoundingBoxType, gfxContext *aRefContext,
PropertyProvider *aProvider, Metrics *aMetrics)
{
if (aStart >= aEnd)
return;
// Measure partial ligature. We hack this by clipping the metrics in the
// same way we clip the drawing.
LigatureData data = ComputeLigatureData(aStart, aEnd, aProvider);
// First measure the complete ligature
Metrics metrics;
AccumulateMetricsForRun(aFont, data.mLigatureStart, data.mLigatureEnd,
aBoundingBoxType, aRefContext,
aProvider, aStart, aEnd, &metrics);
// Clip the bounding box to the ligature part
gfxFloat bboxLeft = metrics.mBoundingBox.X();
gfxFloat bboxRight = metrics.mBoundingBox.XMost();
// Where we are going to start "drawing" relative to our left baseline origin
gfxFloat origin = IsRightToLeft() ? metrics.mAdvanceWidth - data.mPartAdvance : 0;
ClipPartialLigature(this, &bboxLeft, &bboxRight, origin, &data);
metrics.mBoundingBox.x = bboxLeft;
metrics.mBoundingBox.width = bboxRight - bboxLeft;
// mBoundingBox is now relative to the left baseline origin for the entire
// ligature. Shift it left.
metrics.mBoundingBox.x -=
IsRightToLeft() ? metrics.mAdvanceWidth - (data.mPartAdvance + data.mPartWidth)
: data.mPartAdvance;
metrics.mAdvanceWidth = data.mPartWidth;
aMetrics->CombineWith(metrics, IsRightToLeft());
}
gfxTextRun::Metrics
gfxTextRun::MeasureText(uint32_t aStart, uint32_t aLength,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
PropertyProvider *aProvider)
{
NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range");
Metrics accumulatedMetrics;
GlyphRunIterator iter(this, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
uint32_t start = iter.GetStringStart();
uint32_t end = iter.GetStringEnd();
uint32_t ligatureRunStart = start;
uint32_t ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
AccumulatePartialLigatureMetrics(font, start, ligatureRunStart,
aBoundingBoxType, aRefContext, aProvider, &accumulatedMetrics);
// XXX This sucks. We have to get glyph extents just so we can detect
// glyphs outside the font box, even when aBoundingBoxType is LOOSE,
// even though in almost all cases we could get correct results just
// by getting some ascent/descent from the font and using our stored
// advance widths.
AccumulateMetricsForRun(font,
ligatureRunStart, ligatureRunEnd, aBoundingBoxType,
aRefContext, aProvider, ligatureRunStart, ligatureRunEnd,
&accumulatedMetrics);
AccumulatePartialLigatureMetrics(font, ligatureRunEnd, end,
aBoundingBoxType, aRefContext, aProvider, &accumulatedMetrics);
}
return accumulatedMetrics;
}
#define MEASUREMENT_BUFFER_SIZE 100
uint32_t
gfxTextRun::BreakAndMeasureText(uint32_t aStart, uint32_t aMaxLength,
bool aLineBreakBefore, gfxFloat aWidth,
PropertyProvider *aProvider,
bool aSuppressInitialBreak,
gfxFloat *aTrimWhitespace,
Metrics *aMetrics,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
bool *aUsedHyphenation,
uint32_t *aLastBreak,
bool aCanWordWrap,
gfxBreakPriority *aBreakPriority)
{
aMaxLength = std::min(aMaxLength, GetLength() - aStart);
NS_ASSERTION(aStart + aMaxLength <= GetLength(), "Substring out of range");
uint32_t bufferStart = aStart;
uint32_t bufferLength = std::min<uint32_t>(aMaxLength, MEASUREMENT_BUFFER_SIZE);
PropertyProvider::Spacing spacingBuffer[MEASUREMENT_BUFFER_SIZE];
bool haveSpacing = aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING) != 0;
if (haveSpacing) {
GetAdjustedSpacing(this, bufferStart, bufferStart + bufferLength, aProvider,
spacingBuffer);
}
bool hyphenBuffer[MEASUREMENT_BUFFER_SIZE];
bool haveHyphenation = aProvider &&
(aProvider->GetHyphensOption() == NS_STYLE_HYPHENS_AUTO ||
(aProvider->GetHyphensOption() == NS_STYLE_HYPHENS_MANUAL &&
(mFlags & gfxTextRunFactory::TEXT_ENABLE_HYPHEN_BREAKS) != 0));
if (haveHyphenation) {
aProvider->GetHyphenationBreaks(bufferStart, bufferLength,
hyphenBuffer);
}
gfxFloat width = 0;
gfxFloat advance = 0;
// The number of space characters that can be trimmed
uint32_t trimmableChars = 0;
// The amount of space removed by ignoring trimmableChars
gfxFloat trimmableAdvance = 0;
int32_t lastBreak = -1;
int32_t lastBreakTrimmableChars = -1;
gfxFloat lastBreakTrimmableAdvance = -1;
bool aborted = false;
uint32_t end = aStart + aMaxLength;
bool lastBreakUsedHyphenation = false;
uint32_t ligatureRunStart = aStart;
uint32_t ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
uint32_t i;
for (i = aStart; i < end; ++i) {
if (i >= bufferStart + bufferLength) {
// Fetch more spacing and hyphenation data
bufferStart = i;
bufferLength = std::min(aStart + aMaxLength, i + MEASUREMENT_BUFFER_SIZE) - i;
if (haveSpacing) {
GetAdjustedSpacing(this, bufferStart, bufferStart + bufferLength, aProvider,
spacingBuffer);
}
if (haveHyphenation) {
aProvider->GetHyphenationBreaks(bufferStart, bufferLength,
hyphenBuffer);
}
}
// There can't be a word-wrap break opportunity at the beginning of the
// line: if the width is too small for even one character to fit, it
// could be the first and last break opportunity on the line, and that
// would trigger an infinite loop.
if (!aSuppressInitialBreak || i > aStart) {
bool atNaturalBreak = mCharacterGlyphs[i].CanBreakBefore() == 1;
bool atHyphenationBreak =
!atNaturalBreak && haveHyphenation && hyphenBuffer[i - bufferStart];
bool atBreak = atNaturalBreak || atHyphenationBreak;
bool wordWrapping =
aCanWordWrap && mCharacterGlyphs[i].IsClusterStart() &&
*aBreakPriority <= gfxBreakPriority::eWordWrapBreak;
if (atBreak || wordWrapping) {
gfxFloat hyphenatedAdvance = advance;
if (atHyphenationBreak) {
hyphenatedAdvance += aProvider->GetHyphenWidth();
}
if (lastBreak < 0 || width + hyphenatedAdvance - trimmableAdvance <= aWidth) {
// We can break here.
lastBreak = i;
lastBreakTrimmableChars = trimmableChars;
lastBreakTrimmableAdvance = trimmableAdvance;
lastBreakUsedHyphenation = atHyphenationBreak;
*aBreakPriority = atBreak ? gfxBreakPriority::eNormalBreak
: gfxBreakPriority::eWordWrapBreak;
}
width += advance;
advance = 0;
if (width - trimmableAdvance > aWidth) {
// No more text fits. Abort
aborted = true;
break;
}
}
}
gfxFloat charAdvance;
if (i >= ligatureRunStart && i < ligatureRunEnd) {
charAdvance = GetAdvanceForGlyphs(i, i + 1);
if (haveSpacing) {
PropertyProvider::Spacing *space = &spacingBuffer[i - bufferStart];
charAdvance += space->mBefore + space->mAfter;
}
} else {
charAdvance = ComputePartialLigatureWidth(i, i + 1, aProvider);
}
advance += charAdvance;
if (aTrimWhitespace) {
if (mCharacterGlyphs[i].CharIsSpace()) {
++trimmableChars;
trimmableAdvance += charAdvance;
} else {
trimmableAdvance = 0;
trimmableChars = 0;
}
}
}
if (!aborted) {
width += advance;
}
// There are three possibilities:
// 1) all the text fit (width <= aWidth)
// 2) some of the text fit up to a break opportunity (width > aWidth && lastBreak >= 0)
// 3) none of the text fits before a break opportunity (width > aWidth && lastBreak < 0)
uint32_t charsFit;
bool usedHyphenation = false;
if (width - trimmableAdvance <= aWidth) {
charsFit = aMaxLength;
} else if (lastBreak >= 0) {
charsFit = lastBreak - aStart;
trimmableChars = lastBreakTrimmableChars;
trimmableAdvance = lastBreakTrimmableAdvance;
usedHyphenation = lastBreakUsedHyphenation;
} else {
charsFit = aMaxLength;
}
if (aMetrics) {
*aMetrics = MeasureText(aStart, charsFit - trimmableChars,
aBoundingBoxType, aRefContext, aProvider);
}
if (aTrimWhitespace) {
*aTrimWhitespace = trimmableAdvance;
}
if (aUsedHyphenation) {
*aUsedHyphenation = usedHyphenation;
}
if (aLastBreak && charsFit == aMaxLength) {
if (lastBreak < 0) {
*aLastBreak = UINT32_MAX;
} else {
*aLastBreak = lastBreak - aStart;
}
}
return charsFit;
}
gfxFloat
gfxTextRun::GetAdvanceWidth(uint32_t aStart, uint32_t aLength,
PropertyProvider *aProvider)
{
NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range");
uint32_t ligatureRunStart = aStart;
uint32_t ligatureRunEnd = aStart + aLength;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
gfxFloat result = ComputePartialLigatureWidth(aStart, ligatureRunStart, aProvider) +
ComputePartialLigatureWidth(ligatureRunEnd, aStart + aLength, aProvider);
// Account for all remaining spacing here. This is more efficient than
// processing it along with the glyphs.
if (aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING)) {
uint32_t i;
nsAutoTArray<PropertyProvider::Spacing,200> spacingBuffer;
if (spacingBuffer.AppendElements(aLength)) {
GetAdjustedSpacing(this, ligatureRunStart, ligatureRunEnd, aProvider,
spacingBuffer.Elements());
for (i = 0; i < ligatureRunEnd - ligatureRunStart; ++i) {
PropertyProvider::Spacing *space = &spacingBuffer[i];
result += space->mBefore + space->mAfter;
}
}
}
return result + GetAdvanceForGlyphs(ligatureRunStart, ligatureRunEnd);
}
bool
gfxTextRun::SetLineBreaks(uint32_t aStart, uint32_t aLength,
bool aLineBreakBefore, bool aLineBreakAfter,
gfxFloat *aAdvanceWidthDelta,
gfxContext *aRefContext)
{
// Do nothing because our shaping does not currently take linebreaks into
// account. There is no change in advance width.
if (aAdvanceWidthDelta) {
*aAdvanceWidthDelta = 0;
}
return false;
}
uint32_t
gfxTextRun::FindFirstGlyphRunContaining(uint32_t aOffset)
{
NS_ASSERTION(aOffset <= GetLength(), "Bad offset looking for glyphrun");
NS_ASSERTION(GetLength() == 0 || mGlyphRuns.Length() > 0,
"non-empty text but no glyph runs present!");
if (aOffset == GetLength())
return mGlyphRuns.Length();
uint32_t start = 0;
uint32_t end = mGlyphRuns.Length();
while (end - start > 1) {
uint32_t mid = (start + end)/2;
if (mGlyphRuns[mid].mCharacterOffset <= aOffset) {
start = mid;
} else {
end = mid;
}
}
NS_ASSERTION(mGlyphRuns[start].mCharacterOffset <= aOffset,
"Hmm, something went wrong, aOffset should have been found");
return start;
}
nsresult
gfxTextRun::AddGlyphRun(gfxFont *aFont, uint8_t aMatchType,
uint32_t aUTF16Offset, bool aForceNewRun)
{
NS_ASSERTION(aFont, "adding glyph run for null font!");
if (!aFont) {
return NS_OK;
}
uint32_t numGlyphRuns = mGlyphRuns.Length();
if (!aForceNewRun && numGlyphRuns > 0) {
GlyphRun *lastGlyphRun = &mGlyphRuns[numGlyphRuns - 1];
NS_ASSERTION(lastGlyphRun->mCharacterOffset <= aUTF16Offset,
"Glyph runs out of order (and run not forced)");
// Don't append a run if the font is already the one we want
if (lastGlyphRun->mFont == aFont &&
lastGlyphRun->mMatchType == aMatchType)
{
return NS_OK;
}
// If the offset has not changed, avoid leaving a zero-length run
// by overwriting the last entry instead of appending...
if (lastGlyphRun->mCharacterOffset == aUTF16Offset) {
// ...except that if the run before the last entry had the same
// font as the new one wants, merge with it instead of creating
// adjacent runs with the same font
if (numGlyphRuns > 1 &&
mGlyphRuns[numGlyphRuns - 2].mFont == aFont &&
mGlyphRuns[numGlyphRuns - 2].mMatchType == aMatchType)
{
mGlyphRuns.TruncateLength(numGlyphRuns - 1);
return NS_OK;
}
lastGlyphRun->mFont = aFont;
lastGlyphRun->mMatchType = aMatchType;
return NS_OK;
}
}
NS_ASSERTION(aForceNewRun || numGlyphRuns > 0 || aUTF16Offset == 0,
"First run doesn't cover the first character (and run not forced)?");
GlyphRun *glyphRun = mGlyphRuns.AppendElement();
if (!glyphRun)
return NS_ERROR_OUT_OF_MEMORY;
glyphRun->mFont = aFont;
glyphRun->mCharacterOffset = aUTF16Offset;
glyphRun->mMatchType = aMatchType;
return NS_OK;
}
void
gfxTextRun::SortGlyphRuns()
{
if (mGlyphRuns.Length() <= 1)
return;
nsTArray<GlyphRun> runs(mGlyphRuns);
GlyphRunOffsetComparator comp;
runs.Sort(comp);
// Now copy back, coalescing adjacent glyph runs that have the same font
mGlyphRuns.Clear();
uint32_t i, count = runs.Length();
for (i = 0; i < count; ++i) {
// a GlyphRun with the same font as the previous GlyphRun can just
// be skipped; the last GlyphRun will cover its character range.
if (i == 0 || runs[i].mFont != runs[i - 1].mFont) {
mGlyphRuns.AppendElement(runs[i]);
// If two fonts have the same character offset, Sort() will have
// randomized the order.
NS_ASSERTION(i == 0 ||
runs[i].mCharacterOffset !=
runs[i - 1].mCharacterOffset,
"Two fonts for the same run, glyph indices may not match the font");
}
}
}
// Note that SanitizeGlyphRuns scans all glyph runs in the textrun;
// therefore we only call it once, at the end of textrun construction,
// NOT incrementally as each glyph run is added (bug 680402).
void
gfxTextRun::SanitizeGlyphRuns()
{
if (mGlyphRuns.Length() <= 1)
return;
// If any glyph run starts with ligature-continuation characters, we need to advance it
// to the first "real" character to avoid drawing partial ligature glyphs from wrong font
// (seen with U+FEFF in reftest 474417-1, as Core Text eliminates the glyph, which makes
// it appear as if a ligature has been formed)
int32_t i, lastRunIndex = mGlyphRuns.Length() - 1;
const CompressedGlyph *charGlyphs = mCharacterGlyphs;
for (i = lastRunIndex; i >= 0; --i) {
GlyphRun& run = mGlyphRuns[i];
while (charGlyphs[run.mCharacterOffset].IsLigatureContinuation() &&
run.mCharacterOffset < GetLength()) {
run.mCharacterOffset++;
}
// if the run has become empty, eliminate it
if ((i < lastRunIndex &&
run.mCharacterOffset >= mGlyphRuns[i+1].mCharacterOffset) ||
(i == lastRunIndex && run.mCharacterOffset == GetLength())) {
mGlyphRuns.RemoveElementAt(i);
--lastRunIndex;
}
}
}
uint32_t
gfxTextRun::CountMissingGlyphs()
{
uint32_t i;
uint32_t count = 0;
for (i = 0; i < GetLength(); ++i) {
if (mCharacterGlyphs[i].IsMissing()) {
++count;
}
}
return count;
}
gfxTextRun::DetailedGlyph *
gfxTextRun::AllocateDetailedGlyphs(uint32_t aIndex, uint32_t aCount)
{
NS_ASSERTION(aIndex < GetLength(), "Index out of range");
if (!mDetailedGlyphs) {
mDetailedGlyphs = new DetailedGlyphStore();
}
DetailedGlyph *details = mDetailedGlyphs->Allocate(aIndex, aCount);
if (!details) {
mCharacterGlyphs[aIndex].SetMissing(0);
return nullptr;
}
return details;
}
void
gfxTextRun::CopyGlyphDataFrom(gfxShapedWord *aShapedWord, uint32_t aOffset)
{
uint32_t wordLen = aShapedWord->GetLength();
NS_ASSERTION(aOffset + wordLen <= GetLength(),
"word overruns end of textrun!");
CompressedGlyph *charGlyphs = GetCharacterGlyphs();
const CompressedGlyph *wordGlyphs = aShapedWord->GetCharacterGlyphs();
if (aShapedWord->HasDetailedGlyphs()) {
for (uint32_t i = 0; i < wordLen; ++i, ++aOffset) {
const CompressedGlyph& g = wordGlyphs[i];
if (g.IsSimpleGlyph()) {
charGlyphs[aOffset] = g;
} else {
const DetailedGlyph *details =
g.GetGlyphCount() > 0 ?
aShapedWord->GetDetailedGlyphs(i) : nullptr;
SetGlyphs(aOffset, g, details);
}
}
} else {
memcpy(charGlyphs + aOffset, wordGlyphs,
wordLen * sizeof(CompressedGlyph));
}
}
void
gfxTextRun::CopyGlyphDataFrom(gfxTextRun *aSource, uint32_t aStart,
uint32_t aLength, uint32_t aDest)
{
NS_ASSERTION(aStart + aLength <= aSource->GetLength(),
"Source substring out of range");
NS_ASSERTION(aDest + aLength <= GetLength(),
"Destination substring out of range");
if (aSource->mSkipDrawing) {
mSkipDrawing = true;
}
// Copy base glyph data, and DetailedGlyph data where present
const CompressedGlyph *srcGlyphs = aSource->mCharacterGlyphs + aStart;
CompressedGlyph *dstGlyphs = mCharacterGlyphs + aDest;
for (uint32_t i = 0; i < aLength; ++i) {
CompressedGlyph g = srcGlyphs[i];
g.SetCanBreakBefore(!g.IsClusterStart() ?
CompressedGlyph::FLAG_BREAK_TYPE_NONE :
dstGlyphs[i].CanBreakBefore());
if (!g.IsSimpleGlyph()) {
uint32_t count = g.GetGlyphCount();
if (count > 0) {
DetailedGlyph *dst = AllocateDetailedGlyphs(i + aDest, count);
if (dst) {
DetailedGlyph *src = aSource->GetDetailedGlyphs(i + aStart);
if (src) {
::memcpy(dst, src, count * sizeof(DetailedGlyph));
} else {
g.SetMissing(0);
}
} else {
g.SetMissing(0);
}
}
}
dstGlyphs[i] = g;
}
// Copy glyph runs
GlyphRunIterator iter(aSource, aStart, aLength);
#ifdef DEBUG
gfxFont *lastFont = nullptr;
#endif
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
NS_ASSERTION(font != lastFont, "Glyphruns not coalesced?");
#ifdef DEBUG
lastFont = font;
uint32_t end = iter.GetStringEnd();
#endif
uint32_t start = iter.GetStringStart();
// These used to be NS_ASSERTION()s, but WARNING is more appropriate.
// Although it's unusual (and not desirable), it's possible for us to assign
// different fonts to a base character and a following diacritic.
// Example on OSX 10.5/10.6 with default fonts installed:
// data:text/html,<p style="font-family:helvetica, arial, sans-serif;">
// &%23x043E;&%23x0486;&%23x20;&%23x043E;&%23x0486;
// This means the rendering of the cluster will probably not be very good,
// but it's the best we can do for now if the specified font only covered the
// initial base character and not its applied marks.
NS_WARN_IF_FALSE(aSource->IsClusterStart(start),
"Started font run in the middle of a cluster");
NS_WARN_IF_FALSE(end == aSource->GetLength() || aSource->IsClusterStart(end),
"Ended font run in the middle of a cluster");
nsresult rv = AddGlyphRun(font, iter.GetGlyphRun()->mMatchType,
start - aStart + aDest, false);
if (NS_FAILED(rv))
return;
}
}
void
gfxTextRun::SetSpaceGlyph(gfxFont *aFont, gfxContext *aContext,
uint32_t aCharIndex)
{
if (SetSpaceGlyphIfSimple(aFont, aContext, aCharIndex, ' ')) {
return;
}
aFont->InitWordCache();
static const uint8_t space = ' ';
gfxShapedWord *sw = aFont->GetShapedWord(aContext,
&space, 1,
HashMix(0, ' '),
MOZ_SCRIPT_LATIN,
mAppUnitsPerDevUnit,
gfxTextRunFactory::TEXT_IS_8BIT |
gfxTextRunFactory::TEXT_IS_ASCII |
gfxTextRunFactory::TEXT_IS_PERSISTENT,
nullptr);
if (sw) {
AddGlyphRun(aFont, gfxTextRange::kFontGroup, aCharIndex, false);
CopyGlyphDataFrom(sw, aCharIndex);
}
}
bool
gfxTextRun::SetSpaceGlyphIfSimple(gfxFont *aFont, gfxContext *aContext,
uint32_t aCharIndex, char16_t aSpaceChar)
{
uint32_t spaceGlyph = aFont->GetSpaceGlyph();
if (!spaceGlyph || !CompressedGlyph::IsSimpleGlyphID(spaceGlyph)) {
return false;
}
uint32_t spaceWidthAppUnits =
NS_lroundf(aFont->GetMetrics().spaceWidth * mAppUnitsPerDevUnit);
if (!CompressedGlyph::IsSimpleAdvance(spaceWidthAppUnits)) {
return false;
}
AddGlyphRun(aFont, gfxTextRange::kFontGroup, aCharIndex, false);
CompressedGlyph g;
g.SetSimpleGlyph(spaceWidthAppUnits, spaceGlyph);
if (aSpaceChar == ' ') {
g.SetIsSpace();
}
GetCharacterGlyphs()[aCharIndex] = g;
return true;
}
void
gfxTextRun::FetchGlyphExtents(gfxContext *aRefContext)
{
bool needsGlyphExtents = NeedsGlyphExtents(this);
if (!needsGlyphExtents && !mDetailedGlyphs)
return;
uint32_t i, runCount = mGlyphRuns.Length();
CompressedGlyph *charGlyphs = mCharacterGlyphs;
for (i = 0; i < runCount; ++i) {
const GlyphRun& run = mGlyphRuns[i];
gfxFont *font = run.mFont;
uint32_t start = run.mCharacterOffset;
uint32_t end = i + 1 < runCount ?
mGlyphRuns[i + 1].mCharacterOffset : GetLength();
bool fontIsSetup = false;
uint32_t j;
gfxGlyphExtents *extents = font->GetOrCreateGlyphExtents(mAppUnitsPerDevUnit);
for (j = start; j < end; ++j) {
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[j];
if (glyphData->IsSimpleGlyph()) {
// If we're in speed mode, don't set up glyph extents here; we'll
// just return "optimistic" glyph bounds later
if (needsGlyphExtents) {
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
if (!extents->IsGlyphKnown(glyphIndex)) {
if (!fontIsSetup) {
if (!font->SetupCairoFont(aRefContext)) {
NS_WARNING("failed to set up font for glyph extents");
break;
}
fontIsSetup = true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gGlyphExtentsSetupEagerSimple;
#endif
font->SetupGlyphExtents(aRefContext, glyphIndex, false, extents);
}
}
} else if (!glyphData->IsMissing()) {
uint32_t glyphCount = glyphData->GetGlyphCount();
if (glyphCount == 0) {
continue;
}
const gfxTextRun::DetailedGlyph *details = GetDetailedGlyphs(j);
if (!details) {
continue;
}
for (uint32_t k = 0; k < glyphCount; ++k, ++details) {
uint32_t glyphIndex = details->mGlyphID;
if (!extents->IsGlyphKnownWithTightExtents(glyphIndex)) {
if (!fontIsSetup) {
if (!font->SetupCairoFont(aRefContext)) {
NS_WARNING("failed to set up font for glyph extents");
break;
}
fontIsSetup = true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gGlyphExtentsSetupEagerTight;
#endif
font->SetupGlyphExtents(aRefContext, glyphIndex, true, extents);
}
}
}
}
}
}
gfxTextRun::ClusterIterator::ClusterIterator(gfxTextRun *aTextRun)
: mTextRun(aTextRun), mCurrentChar(uint32_t(-1))
{
}
void
gfxTextRun::ClusterIterator::Reset()
{
mCurrentChar = uint32_t(-1);
}
bool
gfxTextRun::ClusterIterator::NextCluster()
{
uint32_t len = mTextRun->GetLength();
while (++mCurrentChar < len) {
if (mTextRun->IsClusterStart(mCurrentChar)) {
return true;
}
}
mCurrentChar = uint32_t(-1);
return false;
}
uint32_t
gfxTextRun::ClusterIterator::ClusterLength() const
{
if (mCurrentChar == uint32_t(-1)) {
return 0;
}
uint32_t i = mCurrentChar,
len = mTextRun->GetLength();
while (++i < len) {
if (mTextRun->IsClusterStart(i)) {
break;
}
}
return i - mCurrentChar;
}
gfxFloat
gfxTextRun::ClusterIterator::ClusterAdvance(PropertyProvider *aProvider) const
{
if (mCurrentChar == uint32_t(-1)) {
return 0;
}
return mTextRun->GetAdvanceWidth(mCurrentChar, ClusterLength(), aProvider);
}
size_t
gfxTextRun::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf)
{
// The second arg is how much gfxTextRun::AllocateStorage would have
// allocated.
size_t total = mGlyphRuns.SizeOfExcludingThis(aMallocSizeOf);
if (mDetailedGlyphs) {
total += mDetailedGlyphs->SizeOfIncludingThis(aMallocSizeOf);
}
return total;
}
size_t
gfxTextRun::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
#ifdef DEBUG
void
gfxTextRun::Dump(FILE* aOutput) {
if (!aOutput) {
aOutput = stdout;
}
uint32_t i;
fputc('[', aOutput);
for (i = 0; i < mGlyphRuns.Length(); ++i) {
if (i > 0) {
fputc(',', aOutput);
}
gfxFont* font = mGlyphRuns[i].mFont;
const gfxFontStyle* style = font->GetStyle();
NS_ConvertUTF16toUTF8 fontName(font->GetName());
nsAutoCString lang;
style->language->ToUTF8String(lang);
fprintf(aOutput, "%d: %s %f/%d/%d/%s", mGlyphRuns[i].mCharacterOffset,
fontName.get(), style->size,
style->weight, style->style, lang.get());
}
fputc(']', aOutput);
}
#endif
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