gfxFont.cpp
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2005-2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <stuart@mozilla.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* John Daggett <jdaggett@mozilla.com>
* Jonathan Kew <jfkthame@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* decision by deleting the provisions above and replace them with the notice
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* the provisions above, a recipient may use your version of this file under
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* ***** END LICENSE BLOCK ***** */
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif
#include "prlog.h"
#include "nsServiceManagerUtils.h"
#include "nsReadableUtils.h"
#include "nsExpirationTracker.h"
#include "nsILanguageAtomService.h"
#include "gfxFont.h"
#include "gfxPlatform.h"
#include "gfxAtoms.h"
#include "prtypes.h"
#include "gfxTypes.h"
#include "nsAlgorithm.h"
#include "gfxContext.h"
#include "gfxFontMissingGlyphs.h"
#include "gfxUserFontSet.h"
#include "gfxPlatformFontList.h"
#include "gfxScriptItemizer.h"
#include "gfxUnicodeProperties.h"
#include "nsMathUtils.h"
#include "nsBidiUtils.h"
#include "nsUnicodeRange.h"
#include "nsCompressedCharMap.h"
#include "nsStyleConsts.h"
#include "mozilla/Preferences.h"
#include "cairo.h"
#include "gfxFontTest.h"
#include "harfbuzz/hb-blob.h"
#include "nsCRT.h"
using namespace mozilla;
gfxFontCache *gfxFontCache::gGlobalCache = nsnull;
#ifdef DEBUG_roc
#define DEBUG_TEXT_RUN_STORAGE_METRICS
#endif
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
static PRUint32 gTextRunStorageHighWaterMark = 0;
static PRUint32 gTextRunStorage = 0;
static PRUint32 gFontCount = 0;
static PRUint32 gGlyphExtentsCount = 0;
static PRUint32 gGlyphExtentsWidthsTotalSize = 0;
static PRUint32 gGlyphExtentsSetupEagerSimple = 0;
static PRUint32 gGlyphExtentsSetupEagerTight = 0;
static PRUint32 gGlyphExtentsSetupLazyTight = 0;
static PRUint32 gGlyphExtentsSetupFallBackToTight = 0;
#endif
gfxFontEntry::~gfxFontEntry()
{
delete mUserFontData;
}
bool gfxFontEntry::IsSymbolFont()
{
return mSymbolFont;
}
bool gfxFontEntry::TestCharacterMap(PRUint32 aCh)
{
if (!mCmapInitialized) {
ReadCMAP();
}
return mCharacterMap.test(aCh);
}
nsresult gfxFontEntry::InitializeUVSMap()
{
// mUVSOffset will not be initialized
// until cmap is initialized.
if (!mCmapInitialized) {
ReadCMAP();
}
if (!mUVSOffset) {
return NS_ERROR_FAILURE;
}
if (!mUVSData) {
const PRUint32 kCmapTag = TRUETYPE_TAG('c','m','a','p');
AutoFallibleTArray<PRUint8,16384> buffer;
if (GetFontTable(kCmapTag, buffer) != NS_OK) {
mUVSOffset = 0; // don't bother to read the table again
return NS_ERROR_FAILURE;
}
PRUint8* uvsData;
nsresult rv = gfxFontUtils::ReadCMAPTableFormat14(
buffer.Elements() + mUVSOffset,
buffer.Length() - mUVSOffset,
uvsData);
if (NS_FAILED(rv)) {
mUVSOffset = 0; // don't bother to read the table again
return rv;
}
mUVSData = uvsData;
}
return NS_OK;
}
PRUint16 gfxFontEntry::GetUVSGlyph(PRUint32 aCh, PRUint32 aVS)
{
InitializeUVSMap();
if (mUVSData) {
return gfxFontUtils::MapUVSToGlyphFormat14(mUVSData, aCh, aVS);
}
return 0;
}
nsresult gfxFontEntry::ReadCMAP()
{
mCmapInitialized = true;
return NS_OK;
}
nsString gfxFontEntry::FamilyName() const
{
NS_ASSERTION(mFamily, "orphaned font entry");
if (mFamily) {
return mFamily->Name();
} else {
return nsString();
}
}
nsString
gfxFontEntry::RealFaceName()
{
FallibleTArray<PRUint8> nameTable;
nsresult rv = GetFontTable(TRUETYPE_TAG('n','a','m','e'), nameTable);
if (NS_SUCCEEDED(rv)) {
nsAutoString name;
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 nsnull;
if (!newFont->Valid()) {
delete newFont;
return nsnull;
}
font = newFont;
gfxFontCache::GetCache()->AddNew(font);
}
gfxFont *f = nsnull;
font.swap(f);
return f;
}
/**
* FontTableBlobData
*
* See FontTableHashEntry for the general strategy.
*/
class gfxFontEntry::FontTableBlobData {
public:
// Adopts the content of aBuffer.
// Pass a non-null aHashEntry only if it should be cleared if/when this
// FontTableBlobData is deleted.
FontTableBlobData(FallibleTArray<PRUint8>& aBuffer,
FontTableHashEntry *aHashEntry)
: mHashEntry(aHashEntry), mHashtable()
{
MOZ_COUNT_CTOR(FontTableBlobData);
mTableData.SwapElements(aBuffer);
}
~FontTableBlobData() {
MOZ_COUNT_DTOR(FontTableBlobData);
if (mHashEntry) {
if (mHashtable) {
mHashtable->RemoveEntry(mHashEntry->GetKey());
} else {
mHashEntry->Clear();
}
}
}
// Useful for creating blobs
const char *GetTable() const
{
return reinterpret_cast<const char*>(mTableData.Elements());
}
PRUint32 GetTableLength() const { return mTableData.Length(); }
// Tell this FontTableBlobData to remove the HashEntry when this is
// destroyed.
void ManageHashEntry(nsTHashtable<FontTableHashEntry> *aHashtable)
{
mHashtable = aHashtable;
}
// Disconnect from the HashEntry (because the blob has already been
// removed from the hashtable).
void ForgetHashEntry()
{
mHashEntry = nsnull;
}
private:
// The font table data block, owned (via adoption)
FallibleTArray<PRUint8> mTableData;
// The blob destroy function needs to know the hashtable entry,
FontTableHashEntry *mHashEntry;
// and the owning hashtable, so that it can remove the entry.
nsTHashtable<FontTableHashEntry> *mHashtable;
// not implemented
FontTableBlobData(const FontTableBlobData&);
};
void
gfxFontEntry::FontTableHashEntry::SaveTable(FallibleTArray<PRUint8>& aTable)
{
Clear();
// adopts elements of aTable
FontTableBlobData *data = new FontTableBlobData(aTable, nsnull);
mBlob = hb_blob_create(data->GetTable(), data->GetTableLength(),
HB_MEMORY_MODE_READONLY,
DeleteFontTableBlobData, data);
}
hb_blob_t *
gfxFontEntry::FontTableHashEntry::
ShareTableAndGetBlob(FallibleTArray<PRUint8>& aTable,
nsTHashtable<FontTableHashEntry> *aHashtable)
{
Clear();
// adopts elements of aTable
mSharedBlobData = new FontTableBlobData(aTable, this);
mBlob = hb_blob_create(mSharedBlobData->GetTable(),
mSharedBlobData->GetTableLength(),
HB_MEMORY_MODE_READONLY,
DeleteFontTableBlobData, mSharedBlobData);
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);
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 = nsnull;
} else if (mBlob) {
hb_blob_destroy(mBlob);
}
mBlob = nsnull;
}
// 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(PRUint32 aTag, hb_blob_t **aBlob)
{
if (!mFontTableCache.IsInitialized()) {
// we do this here rather than on fontEntry construction
// because not all shapers will access the table cache at all
mFontTableCache.Init(10);
}
FontTableHashEntry *entry = mFontTableCache.GetEntry(aTag);
if (!entry) {
return false;
}
*aBlob = entry->GetBlob();
return true;
}
hb_blob_t *
gfxFontEntry::ShareFontTableAndGetBlob(PRUint32 aTag,
FallibleTArray<PRUint8>* aBuffer)
{
if (NS_UNLIKELY(!mFontTableCache.IsInitialized())) {
// we do this here rather than on fontEntry construction
// because not all shapers will access the table cache at all
mFontTableCache.Init(10);
}
FontTableHashEntry *entry = mFontTableCache.PutEntry(aTag);
if (NS_UNLIKELY(!entry)) { // OOM
return nsnull;
}
if (!aBuffer) {
// ensure the entry is null
entry->Clear();
return nsnull;
}
return entry->ShareTableAndGetBlob(*aBuffer, &mFontTableCache);
}
//////////////////////////////////////////////////////////////////////////////
//
// 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;
PRInt8 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 & (FONT_STYLE_ITALIC | 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 NULL.
// 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.
PRUint8 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 PRUint8 simpleFallbacks[4][3] = {
{ kBoldFaceIndex, kItalicFaceIndex, kBoldItalicFaceIndex }, // fallbacks for Regular
{ kRegularFaceIndex, kBoldItalicFaceIndex, kItalicFaceIndex },// Bold
{ kBoldItalicFaceIndex, kRegularFaceIndex, kBoldFaceIndex }, // Italic
{ kItalicFaceIndex, kBoldFaceIndex, kRegularFaceIndex } // BoldItalic
};
const PRUint8 *order = simpleFallbacks[faceIndex];
for (PRUint8 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 nsnull;
}
// 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 nsnull;
}
// First find a match for the best weight
PRInt8 matchBaseWeight = 0;
PRInt8 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
PRInt8 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()
{
PRUint32 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;
}
PRInt16 firstStretch = mAvailableFonts[0]->Stretch();
gfxFontEntry *faces[4] = { 0 };
for (PRUint8 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
}
PRUint8 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 (PRUint8 i = 0; i < 4; ++i) {
if (mAvailableFonts[i].get() != faces[i]) {
mAvailableFonts[i].swap(faces[i]);
}
}
mIsSimpleFamily = true;
}
static inline PRUint32
StyleDistance(gfxFontEntry *aFontEntry,
bool anItalic, PRInt16 aStretch)
{
// Compute a measure of the "distance" between the requested style
// and the given fontEntry,
// considering italicness and font-stretch but not weight.
PRInt32 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 PRUint32(distance);
}
bool
gfxFontFamily::FindWeightsForStyle(gfxFontEntry* aFontsForWeights[],
bool anItalic, PRInt16 aStretch)
{
PRUint32 foundWeights = 0;
PRUint32 bestMatchDistance = 0xffffffff;
for (PRUint32 i = 0; i < mAvailableFonts.Length(); i++) {
// this is not called for "simple" families, and therefore it does not
// need to check the mAvailableFonts entries for NULL
gfxFontEntry *fe = mAvailableFonts[i];
PRUint32 distance = StyleDistance(fe, anItalic, aStretch);
if (distance <= bestMatchDistance) {
PRInt8 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 {
PRUint32 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 (PRUint32 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;
}
void
gfxFontFamily::FindFontForChar(FontSearch *aMatchData)
{
if (!mHasStyles)
FindStyleVariations();
// xxx - optimization point - keep a bit vector with the union of supported unicode ranges
// by all fonts for this family and bail immediately if the character is not in any of
// this family's cmaps
// iterate over fonts
PRUint32 numFonts = mAvailableFonts.Length();
for (PRUint32 i = 0; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i];
// skip certain fonts during system fallback
if (!fe || fe->SkipDuringSystemFallback())
continue;
PRInt32 rank = 0;
if (fe->TestCharacterMap(aMatchData->mCh)) {
rank += 20;
aMatchData->mCount++;
#ifdef PR_LOGGING
PRLogModuleInfo *log = gfxPlatform::GetLog(eGfxLog_textrun);
if (NS_UNLIKELY(log)) {
PRUint32 charRange = gfxFontUtils::CharRangeBit(aMatchData->mCh);
PRUint32 unicodeRange = FindCharUnicodeRange(aMatchData->mCh);
PRUint32 hbscript = gfxUnicodeProperties::GetScriptCode(aMatchData->mCh);
PR_LOG(log, PR_LOG_DEBUG,\
("(textrun-systemfallback-fonts) char: u+%6.6x "
"char-range: %d unicode-range: %d script: %d match: [%s]\n",
aMatchData->mCh,
charRange, unicodeRange, hbscript,
NS_ConvertUTF16toUTF8(fe->Name()).get()));
}
#endif
}
// if we didn't match any characters don't bother wasting more time with this face.
if (rank == 0)
continue;
// omitting from original windows code -- family name, lang group, pitch
// not available in current FontEntry implementation
if (aMatchData->mFontToMatch) {
const gfxFontStyle *style = aMatchData->mFontToMatch->GetStyle();
// italics
bool wantItalic =
((style->style & (FONT_STYLE_ITALIC | FONT_STYLE_OBLIQUE)) != 0);
if (fe->IsItalic() == wantItalic) {
rank += 5;
}
// weight
PRInt32 targetWeight = style->ComputeWeight() * 100;
PRInt32 entryWeight = fe->Weight();
if (entryWeight == targetWeight) {
rank += 5;
} else {
PRUint32 diffWeight = abs(entryWeight - targetWeight);
if (diffWeight <= 100) // favor faces close in weight
rank += 2;
}
} else {
// if no font to match, prefer non-bold, non-italic fonts
if (!fe->IsItalic()) {
rank += 3;
}
if (!fe->IsBold()) {
rank += 2;
}
}
// 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->mMatchRank = rank;
}
}
}
// returns true if other names were found, false otherwise
bool
gfxFontFamily::ReadOtherFamilyNamesForFace(gfxPlatformFontList *aPlatformFontList,
FallibleTArray<PRUint8>& aNameTable,
bool useFullName)
{
const PRUint8 *nameData = aNameTable.Elements();
PRUint32 dataLength = aNameTable.Length();
const gfxFontUtils::NameHeader *nameHeader =
reinterpret_cast<const gfxFontUtils::NameHeader*>(nameData);
PRUint32 nameCount = nameHeader->count;
if (nameCount * sizeof(gfxFontUtils::NameRecord) > dataLength) {
NS_WARNING("invalid font (name records)");
return false;
}
const gfxFontUtils::NameRecord *nameRecord =
reinterpret_cast<const gfxFontUtils::NameRecord*>(nameData + sizeof(gfxFontUtils::NameHeader));
PRUint32 stringsBase = PRUint32(nameHeader->stringOffset);
bool foundNames = false;
for (PRUint32 i = 0; i < nameCount; i++, nameRecord++) {
PRUint32 nameLen = nameRecord->length;
PRUint32 nameOff = nameRecord->offset; // offset from base of string storage
if (stringsBase + nameOff + nameLen > dataLength) {
NS_WARNING("invalid font (name table strings)");
return false;
}
PRUint16 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(nameData + stringsBase + nameOff,
nameLen,
PRUint32(nameRecord->platformID),
PRUint32(nameRecord->encodingID),
PRUint32(nameRecord->languageID),
otherFamilyName);
// add if not same as canonical family name
if (ok && otherFamilyName != mName) {
aPlatformFontList->AddOtherFamilyName(this, otherFamilyName);
foundNames = true;
}
}
}
return foundNames;
}
void
gfxFontFamily::ReadOtherFamilyNames(gfxPlatformFontList *aPlatformFontList)
{
if (mOtherFamilyNamesInitialized)
return;
mOtherFamilyNamesInitialized = true;
FindStyleVariations();
// read in other family names for the first face in the list
PRUint32 i, numFonts = mAvailableFonts.Length();
const PRUint32 kNAME = TRUETYPE_TAG('n','a','m','e');
AutoFallibleTArray<PRUint8,8192> buffer;
for (i = 0; i < numFonts; ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (!fe)
continue;
if (fe->GetFontTable(kNAME, buffer) != NS_OK)
continue;
mHasOtherFamilyNames = ReadOtherFamilyNamesForFace(aPlatformFontList,
buffer);
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;
if (fe->GetFontTable(kNAME, buffer) != NS_OK)
continue;
ReadOtherFamilyNamesForFace(aPlatformFontList, buffer);
}
}
void
gfxFontFamily::ReadFaceNames(gfxPlatformFontList *aPlatformFontList,
bool aNeedFullnamePostscriptNames)
{
// if all needed names have already been read, skip
if (mOtherFamilyNamesInitialized &&
(mFaceNamesInitialized || !aNeedFullnamePostscriptNames))
return;
FindStyleVariations();
PRUint32 i, numFonts = mAvailableFonts.Length();
const PRUint32 kNAME = TRUETYPE_TAG('n','a','m','e');
AutoFallibleTArray<PRUint8,8192> buffer;
nsAutoString fullname, psname;
bool firstTime = true, readAllFaces = false;
for (i = 0; i < numFonts; ++i) {
gfxFontEntry *fe = mAvailableFonts[i];
if (!fe)
continue;
if (fe->GetFontTable(kNAME, buffer) != NS_OK)
continue;
if (aNeedFullnamePostscriptNames) {
if (gfxFontUtils::ReadCanonicalName(
buffer, gfxFontUtils::NAME_ID_FULL, fullname) == NS_OK)
{
aPlatformFontList->AddFullname(fe, fullname);
}
if (gfxFontUtils::ReadCanonicalName(
buffer, gfxFontUtils::NAME_ID_POSTSCRIPT, psname) == NS_OK)
{
aPlatformFontList->AddPostscriptName(fe, psname);
}
}
if (!mOtherFamilyNamesInitialized && (firstTime || readAllFaces)) {
bool foundOtherName = ReadOtherFamilyNamesForFace(aPlatformFontList,
buffer);
// 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
PRUint32 numFonts = mAvailableFonts.Length();
for (PRUint32 i = 0; i < numFonts; i++) {
gfxFontEntry *fe = mAvailableFonts[i].get();
if (fe && fe->Name() == aPostscriptName)
return fe;
}
return nsnull;
}
nsresult
gfxFontCache::Init()
{
NS_ASSERTION(!gGlobalCache, "Where did this come from?");
gGlobalCache = new gfxFontCache();
return gGlobalCache ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
void
gfxFontCache::Shutdown()
{
delete gGlobalCache;
gGlobalCache = nsnull;
#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
}
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);
if (!entry)
return nsnull;
gfxFont *font = entry->mFont;
NS_ADDREF(font);
return font;
}
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;
// 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)
{
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;
}
void
gfxFont::RunMetrics::CombineWith(const RunMetrics& aOther, bool aOtherIsOnLeft)
{
mAscent = NS_MAX(mAscent, aOther.mAscent);
mDescent = NS_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) :
mFontEntry(aFontEntry), mIsValid(true),
mApplySyntheticBold(false),
mStyle(*aFontStyle),
mAdjustedSize(0.0),
mFUnitsConvFactor(0.0f),
mAntialiasOption(anAAOption),
mPlatformShaper(nsnull),
mHarfBuzzShaper(nsnull)
{
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gFontCount;
#endif
}
gfxFont::~gfxFont()
{
PRUint32 i;
// 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 < mGlyphExtentsArray.Length(); ++i) {
delete mGlyphExtentsArray[i];
}
}
hb_blob_t *
gfxFont::GetFontTable(PRUint32 aTag) {
hb_blob_t *blob;
if (mFontEntry->GetExistingFontTable(aTag, &blob))
return blob;
FallibleTArray<PRUint8> buffer;
bool haveTable = NS_SUCCEEDED(mFontEntry->GetFontTable(aTag, buffer));
return mFontEntry->ShareFontTableAndGetBlob(aTag,
haveTable ? &buffer : nsnull);
}
/**
* 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, bool aDrawToPath, bool aReverse,
bool aFinish = false) {
// Ensure there's enough room for a glyph to be added to the buffer
if (!aFinish && mNumGlyphs < GLYPH_BUFFER_SIZE) {
return;
}
if (aReverse) {
for (PRUint32 i = 0; i < mNumGlyphs/2; ++i) {
cairo_glyph_t tmp = mGlyphBuffer[i];
mGlyphBuffer[i] = mGlyphBuffer[mNumGlyphs - 1 - i];
mGlyphBuffer[mNumGlyphs - 1 - i] = tmp;
}
}
if (aDrawToPath)
cairo_glyph_path(aCR, mGlyphBuffer, mNumGlyphs);
else
cairo_show_glyphs(aCR, mGlyphBuffer, mNumGlyphs);
mNumGlyphs = 0;
}
#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.
static double
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;
}
void
gfxFont::Draw(gfxTextRun *aTextRun, PRUint32 aStart, PRUint32 aEnd,
gfxContext *aContext, bool aDrawToPath, gfxPoint *aPt,
Spacing *aSpacing)
{
if (aStart >= aEnd)
return;
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
const double devUnitsPerAppUnit = 1.0/double(appUnitsPerDevUnit);
bool isRTL = aTextRun->IsRightToLeft();
double direction = aTextRun->GetDirection();
// synthetic-bold strikes are each offset one device pixel in run direction
// (these values are only needed if IsSyntheticBold() is true)
double synBoldOnePixelOffset;
PRInt32 strikes;
if (IsSyntheticBold()) {
double xscale = CalcXScale(aContext);
synBoldOnePixelOffset = direction * xscale;
// use as many strikes as needed for the the increased advance
strikes = NS_lroundf(GetSyntheticBoldOffset() / xscale);
}
PRUint32 i;
// Current position in appunits
double x = aPt->x;
double y = aPt->y;
bool success = SetupCairoFont(aContext);
if (NS_UNLIKELY(!success))
return;
GlyphBuffer glyphs;
cairo_glyph_t *glyph;
cairo_t *cr = aContext->GetCairo();
if (aSpacing) {
x += direction*aSpacing[0].mBefore;
}
for (i = aStart; i < aEnd; ++i) {
const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[i];
if (glyphData->IsSimpleGlyph()) {
glyph = glyphs.AppendGlyph();
glyph->index = glyphData->GetSimpleGlyph();
double advance = glyphData->GetSimpleAdvance();
// 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
double glyphX;
if (isRTL) {
x -= advance;
glyphX = x;
} else {
glyphX = x;
x += advance;
}
glyph->x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->y = ToDeviceUnits(y, devUnitsPerAppUnit);
glyphs.Flush(cr, aDrawToPath, isRTL);
// 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;
PRInt32 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, aDrawToPath, isRTL);
} while (--strikeCount > 0);
}
} else {
PRUint32 glyphCount = glyphData->GetGlyphCount();
if (glyphCount > 0) {
const gfxTextRun::DetailedGlyph *details =
aTextRun->GetDetailedGlyphs(i);
NS_ASSERTION(details, "detailedGlyph should not be missing!");
for (PRUint32 j = 0; j < glyphCount; ++j, ++details) {
double 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 (!aDrawToPath && 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);
}
} else {
glyph = glyphs.AppendGlyph();
glyph->index = details->mGlyphID;
double glyphX = x + details->mXOffset;
if (isRTL) {
glyphX -= advance;
}
glyph->x = ToDeviceUnits(glyphX, devUnitsPerAppUnit);
glyph->y = ToDeviceUnits(y + details->mYOffset, devUnitsPerAppUnit);
glyphs.Flush(cr, aDrawToPath, isRTL);
if (IsSyntheticBold()) {
double strikeOffset = synBoldOnePixelOffset;
PRInt32 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, aDrawToPath, isRTL);
} while (--strikeCount > 0);
}
}
x += direction*advance;
}
}
}
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, aDrawToPath, isRTL, true);
*aPt = gfxPoint(x, y);
}
static void
UnionRange(gfxFloat aX, gfxFloat* aDestMin, gfxFloat* aDestMax)
{
*aDestMin = NS_MIN(*aDestMin, aX);
*aDestMax = NS_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;
PRUint32 numRuns;
const gfxTextRun::GlyphRun *glyphRuns = aTextRun->GetGlyphRuns(&numRuns);
for (PRUint32 i = 0; i < numRuns; ++i) {
if (glyphRuns[i].mFont->GetFontEntry()->IsUserFont())
return true;
}
return false;
}
gfxFont::RunMetrics
gfxFont::Measure(gfxTextRun *aTextRun,
PRUint32 aStart, PRUint32 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 PRUint32 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()) ? nsnull
: GetOrCreateGlyphExtents(aTextRun->GetAppUnitsPerDevUnit());
double x = 0;
if (aSpacing) {
x += direction*aSpacing[0].mBefore;
}
PRUint32 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) {
PRUint32 glyphIndex = glyphData->GetSimpleGlyph();
PRUint16 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 {
PRUint32 glyphCount = glyphData->GetGlyphCount();
if (glyphCount > 0) {
const gfxTextRun::DetailedGlyph *details =
aTextRun->GetDetailedGlyphs(i);
NS_ASSERTION(details != nsnull,
"detaiedGlyph record should not be missing!");
PRUint32 j;
for (j = 0; j < glyphCount; ++j, ++details) {
PRUint32 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;
}
#define MAX_SHAPING_LENGTH 32760 // slightly less than 32K, trying to avoid
// over-stressing platform shapers
#define BACKTRACK_LIMIT 1024 // If we can't find a space or a cluster start
// within 1K chars, just chop arbitrarily.
// Limiting backtrack here avoids pathological
// behavior on long runs with no whitespace.
bool
gfxFont::SplitAndInitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript)
{
bool ok;
#ifdef PR_LOGGING
PRLogModuleInfo *log = (mStyle.systemFont ?
gfxPlatform::GetLog(eGfxLog_textrunui) :
gfxPlatform::GetLog(eGfxLog_textrun));
if (NS_UNLIKELY(log)) {
nsCAutoString lang;
mStyle.language->ToUTF8String(lang);
PR_LOG(log, PR_LOG_DEBUG,\
("(%s-fontmatching) font: [%s] lang: %s script: %d len: %d "
"TEXTRUN [%s] ENDTEXTRUN\n",
(mStyle.systemFont ? "textrunui" : "textrun"),
NS_ConvertUTF16toUTF8(GetName()).get(),
lang.get(), aRunScript, aRunLength,
NS_ConvertUTF16toUTF8(aString + aRunStart, aRunLength).get()));
}
#endif
do {
// Because various shaping backends struggle with very long runs,
// we look for appropriate break locations (preferring whitespace),
// and shape sub-runs of no more than 32K characters at a time.
// See bug 606714 (CoreText), and similar Uniscribe issues.
// This loop always executes at least once, and "processes" up to
// MAX_RUN_LENGTH_FOR_SHAPING characters, updating aRunStart and
// aRunLength accordingly. It terminates when the entire run has
// been processed, or when shaping fails.
PRUint32 thisRunLength;
ok = false;
if (aRunLength <= MAX_SHAPING_LENGTH) {
thisRunLength = aRunLength;
} else {
// We're splitting this font run because it's very long
PRUint32 offset = aRunStart + MAX_SHAPING_LENGTH;
PRUint32 clusterStart = 0;
while (offset > aRunStart + MAX_SHAPING_LENGTH - BACKTRACK_LIMIT) {
if (aTextRun->IsClusterStart(offset)) {
if (!clusterStart) {
clusterStart = offset;
}
if (aString[offset] == ' ' || aString[offset - 1] == ' ') {
break;
}
}
--offset;
}
if (offset > MAX_SHAPING_LENGTH - BACKTRACK_LIMIT) {
// we found a space, so break the run there
thisRunLength = offset - aRunStart;
} else if (clusterStart != 0) {
// didn't find a space, but we found a cluster start
thisRunLength = clusterStart - aRunStart;
} else {
// otherwise we'll simply break at MAX_SHAPING_LENGTH chars,
// which may interfere with shaping behavior (but in practice
// only pathological cases will lack ANY whitespace or cluster
// boundaries, so we don't really care; it won't affect any
// "real" text)
thisRunLength = MAX_SHAPING_LENGTH;
}
}
ok = InitTextRun(aContext, aTextRun, aString,
aRunStart, thisRunLength, aRunScript);
aRunStart += thisRunLength;
aRunLength -= thisRunLength;
} while (ok && aRunLength > 0);
NS_WARN_IF_FALSE(ok, "shaper failed, expect scrambled or missing text");
return ok;
}
bool
gfxFont::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript,
bool aPreferPlatformShaping)
{
bool ok = false;
if (mHarfBuzzShaper && !aPreferPlatformShaping) {
if (gfxPlatform::GetPlatform()->UseHarfBuzzForScript(aRunScript)) {
ok = mHarfBuzzShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
}
}
if (!ok) {
if (!mPlatformShaper) {
CreatePlatformShaper();
NS_ASSERTION(mPlatformShaper, "no platform shaper available!");
}
if (mPlatformShaper) {
ok = mPlatformShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength,
aRunScript);
}
}
return ok;
}
gfxGlyphExtents *
gfxFont::GetOrCreateGlyphExtents(PRUint32 aAppUnitsPerDevUnit) {
PRUint32 i;
for (i = 0; i < mGlyphExtentsArray.Length(); ++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, PRUint32 aGlyphID, bool aNeedTight,
gfxGlyphExtents *aExtents)
{
gfxMatrix matrix = aContext->CurrentMatrix();
aContext->IdentityMatrix();
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);
aContext->SetMatrix(matrix);
const Metrics& fontMetrics = GetMetrics();
PRUint32 appUnitsPerDevUnit = aExtents->GetAppUnitsPerDevUnit();
if (!aNeedTight && extents.x_bearing >= 0 &&
extents.y_bearing >= -fontMetrics.maxAscent &&
extents.height + extents.y_bearing <= fontMetrics.maxDescent) {
PRUint32 appUnitsWidth =
PRUint32(ceil((extents.x_bearing + extents.width)*appUnitsPerDevUnit));
if (appUnitsWidth < gfxGlyphExtents::INVALID_WIDTH) {
aExtents->SetContainedGlyphWidthAppUnits(aGlyphID, PRUint16(appUnitsWidth));
return;
}
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
if (!aNeedTight) {
++gGlyphExtentsSetupFallBackToTight;
}
#endif
double 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.
bool
gfxFont::InitMetricsFromSfntTables(Metrics& aMetrics)
{
mIsValid = false; // font is NOT valid in case of early return
const PRUint32 kHeadTableTag = TRUETYPE_TAG('h','e','a','d');
const PRUint32 kHheaTableTag = TRUETYPE_TAG('h','h','e','a');
const PRUint32 kPostTableTag = TRUETYPE_TAG('p','o','s','t');
const PRUint32 kOS_2TableTag = TRUETYPE_TAG('O','S','/','2');
if (mFUnitsConvFactor == 0.0) {
// If the conversion factor from FUnits is not yet set,
// 'head' table is required; otherwise we cannot read any metrics
// because we don't know unitsPerEm
AutoFallibleTArray<PRUint8,sizeof(HeadTable)> headData;
if (NS_FAILED(mFontEntry->GetFontTable(kHeadTableTag, headData)) ||
headData.Length() < sizeof(HeadTable)) {
return false; // no 'head' table -> not an sfnt
}
HeadTable *head = reinterpret_cast<HeadTable*>(headData.Elements());
PRUint32 unitsPerEm = head->unitsPerEm;
if (!unitsPerEm) {
return true; // is an sfnt, but not valid
}
mFUnitsConvFactor = mAdjustedSize / unitsPerEm;
}
// 'hhea' table is required to get vertical extents
AutoFallibleTArray<PRUint8,sizeof(HheaTable)> hheaData;
if (NS_FAILED(mFontEntry->GetFontTable(kHheaTableTag, hheaData)) ||
hheaData.Length() < sizeof(HheaTable)) {
return false; // no 'hhea' table -> not an sfnt
}
HheaTable *hhea = reinterpret_cast<HheaTable*>(hheaData.Elements());
#define SET_UNSIGNED(field,src) aMetrics.field = PRUint16(src) * mFUnitsConvFactor
#define SET_SIGNED(field,src) aMetrics.field = PRInt16(src) * mFUnitsConvFactor
SET_UNSIGNED(maxAdvance, hhea->advanceWidthMax);
SET_SIGNED(maxAscent, hhea->ascender);
SET_SIGNED(maxDescent, -PRInt16(hhea->descender));
SET_SIGNED(externalLeading, hhea->lineGap);
// 'post' table is required for underline metrics
AutoFallibleTArray<PRUint8,sizeof(PostTable)> postData;
if (NS_FAILED(mFontEntry->GetFontTable(kPostTableTag, postData))) {
return true; // no 'post' table -> sfnt is not valid
}
if (postData.Length() <
offsetof(PostTable, underlineThickness) + sizeof(PRUint16)) {
return true; // bad post table -> sfnt is not valid
}
PostTable *post = reinterpret_cast<PostTable*>(postData.Elements());
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
AutoFallibleTArray<PRUint8,sizeof(OS2Table)> os2data;
if (NS_SUCCEEDED(mFontEntry->GetFontTable(kOS_2TableTag, os2data))) {
OS2Table *os2 = reinterpret_cast<OS2Table*>(os2data.Elements());
if (os2data.Length() >= offsetof(OS2Table, sxHeight) +
sizeof(PRInt16) &&
PRUint16(os2->version) >= 2) {
// version 2 and later includes the x-height field
SET_SIGNED(xHeight, os2->sxHeight);
// NS_ABS because of negative xHeight seen in Kokonor (Tibetan) font
aMetrics.xHeight = NS_ABS(aMetrics.xHeight);
}
// this should always be present
if (os2data.Length() >= offsetof(OS2Table, yStrikeoutPosition) +
sizeof(PRInt16)) {
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 = NS_MAX(1.0, aMetrics->underlineSize);
aMetrics->strikeoutSize = NS_MAX(1.0, aMetrics->strikeoutSize);
aMetrics->underlineOffset = NS_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 = NS_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 = NS_MIN(aMetrics->underlineOffset, -aMetrics->emDescent);
} else {
aMetrics->underlineOffset = NS_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 = NS_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 = NS_MAX(aMetrics->maxAscent, 1.0);
halfOfStrikeoutSize = floor(aMetrics->strikeoutSize / 2.0 + 0.5);
}
gfxFloat ascent = floor(aMetrics->maxAscent + 0.5);
aMetrics->strikeoutOffset = NS_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(PRUint32 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;
}
}
gfxGlyphExtents::~gfxGlyphExtents()
{
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
gGlyphExtentsWidthsTotalSize += mContainedGlyphWidths.ComputeSize();
gGlyphExtentsCount++;
#endif
MOZ_COUNT_DTOR(gfxGlyphExtents);
}
bool
gfxGlyphExtents::GetTightGlyphExtentsAppUnits(gfxFont *aFont,
gfxContext *aContext, PRUint32 aGlyphID, gfxRect *aExtents)
{
HashEntry *entry = mTightGlyphExtents.GetEntry(aGlyphID);
if (!entry) {
if (!aContext) {
NS_WARNING("Could not get glyph extents (no aContext)");
return false;
}
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()
{
PRUint32 i;
for (i = 0; i < mBlocks.Length(); ++i) {
PtrBits bits = mBlocks[i];
if (bits && !(bits & 0x1)) {
delete[] reinterpret_cast<PRUint16 *>(bits);
}
}
}
#ifdef DEBUG
PRUint32
gfxGlyphExtents::GlyphWidths::ComputeSize()
{
PRUint32 i;
PRUint32 size = mBlocks.Capacity()*sizeof(PtrBits);
for (i = 0; i < mBlocks.Length(); ++i) {
PtrBits bits = mBlocks[i];
if (bits && !(bits & 0x1)) {
size += BLOCK_SIZE*sizeof(PRUint16);
}
}
return size;
}
#endif
void
gfxGlyphExtents::GlyphWidths::Set(PRUint32 aGlyphID, PRUint16 aWidth)
{
PRUint32 block = aGlyphID >> BLOCK_SIZE_BITS;
PRUint32 len = mBlocks.Length();
if (block >= len) {
PtrBits *elems = mBlocks.AppendElements(block + 1 - len);
if (!elems)
return;
memset(elems, 0, sizeof(PtrBits)*(block + 1 - len));
}
PtrBits bits = mBlocks[block];
PRUint32 glyphOffset = aGlyphID & (BLOCK_SIZE - 1);
if (!bits) {
mBlocks[block] = MakeSingle(glyphOffset, aWidth);
return;
}
PRUint16 *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 PRUint16[BLOCK_SIZE];
if (!newBlock)
return;
PRUint32 i;
for (i = 0; i < BLOCK_SIZE; ++i) {
newBlock[i] = INVALID_WIDTH;
}
newBlock[GetGlyphOffset(bits)] = GetWidth(bits);
mBlocks[block] = reinterpret_cast<PtrBits>(newBlock);
} else {
newBlock = reinterpret_cast<PRUint16 *>(bits);
}
newBlock[glyphOffset] = aWidth;
}
void
gfxGlyphExtents::SetTightGlyphExtents(PRUint32 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();
}
gfxFontGroup::gfxFontGroup(const nsAString& aFamilies, const gfxFontStyle *aStyle, gfxUserFontSet *aUserFontSet)
: mFamilies(aFamilies), mStyle(*aStyle), mUnderlineOffset(UNDERLINE_OFFSET_NOT_SET)
{
mUserFontSet = nsnull;
SetUserFontSet(aUserFontSet);
mSkipDrawing = false;
mPageLang = gfxPlatform::GetFontPrefLangFor(mStyle.language);
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();
gfxFontEntry *defaultFont = pfl->GetDefaultFont(&mStyle, needsBold);
NS_ASSERTION(defaultFont, "invalid default font returned by GetDefaultFont");
if (defaultFont) {
nsRefPtr<gfxFont> font = defaultFont->FindOrMakeFont(&mStyle,
needsBold);
if (font) {
mFonts.AppendElement(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);
for (PRUint32 i = 0; i < families.Length(); ++i) {
gfxFontEntry *fe = families[i]->FindFontForStyle(mStyle,
needsBold);
if (fe) {
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&mStyle,
needsBold);
if (font) {
mFonts.AppendElement(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) {
for (PRUint32 i = 0; i < mFonts.Length(); ++i) {
gfxFont* font = mFonts[i];
if (font->GetFontEntry()->mIsBadUnderlineFont) {
gfxFloat first = mFonts[0]->GetMetrics().underlineOffset;
gfxFloat bad = font->GetMetrics().underlineOffset;
mUnderlineOffset = NS_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;
gfxFontEntry *fe = nsnull;
bool foundFamily = false;
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.
bool waitForUserFont = false;
fe = fs->FindFontEntry(aName, *fontStyle, foundFamily,
needsBold, waitForUserFont);
if (!fe && waitForUserFont) {
fontGroup->mSkipDrawing = true;
}
}
}
// Not known in the user font set ==> check system fonts
if (!foundFamily) {
fe = gfxPlatformFontList::PlatformFontList()->
FindFontForFamily(aName, 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(font);
}
}
return true;
}
bool
gfxFontGroup::HasFont(const gfxFontEntry *aFontEntry)
{
for (PRUint32 i = 0; i < mFonts.Length(); ++i) {
if (mFonts.ElementAt(i)->GetFontEntry() == aFontEntry)
return true;
}
return false;
}
gfxFontGroup::~gfxFontGroup() {
mFonts.Clear();
SetUserFontSet(nsnull);
}
gfxFontGroup *
gfxFontGroup::Copy(const gfxFontStyle *aStyle)
{
return new gfxFontGroup(mFamilies, aStyle, mUserFontSet);
}
bool
gfxFontGroup::IsInvalidChar(PRUnichar ch) {
if (ch >= 32) {
return ch == 0x0085/*NEL*/ ||
((ch & 0xFF00) == 0x2000 /* Unicode control character */ &&
(ch == 0x200B/*ZWSP*/ || ch == 0x2028/*LSEP*/ || ch == 0x2029/*PSEP*/ ||
IS_BIDI_CONTROL_CHAR(ch)));
}
// We could just blacklist all control characters, but it seems better
// to only blacklist the ones we know cause problems for native font
// engines.
return ch == 0x0B || ch == '\t' || ch == '\r' || ch == '\n' || ch == '\f' ||
(ch >= 0x1c && ch <= 0x1f);
}
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 PRUnichar kSingleQuote = PRUnichar('\'');
const PRUnichar kDoubleQuote = PRUnichar('\"');
const PRUnichar kComma = PRUnichar(',');
nsIAtom *groupAtom = nsnull;
nsCAutoString groupString;
if (aLanguage) {
if (!gLangService) {
CallGetService(NS_LANGUAGEATOMSERVICE_CONTRACTID, &gLangService);
}
if (gLangService) {
nsresult rv;
groupAtom = gLangService->GetLanguageGroup(aLanguage, &rv);
}
}
if (!groupAtom) {
groupAtom = gfxAtoms::x_unicode;
}
groupAtom->ToUTF8String(groupString);
nsPromiseFlatString families(aFamilies);
const PRUnichar *p, *p_end;
families.BeginReading(p);
families.EndReading(p_end);
nsAutoString family;
nsCAutoString 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
PRUnichar quoteMark = *p;
if (++p == p_end)
return true;
const PRUnichar *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 PRUnichar *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);
nsCAutoString 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;
if (aUseFontSet && mUserFontSet &&
mUserFontSet->FindFontEntry(family, mStyle, foundFamily,
needsBold, waitForUserFont))
{
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) {
nsCAutoString 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, PRUint32 aFlags)
{
aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT;
return gfxTextRun::Create(aParams, nsnull, 0, this, aFlags);
}
gfxTextRun *
gfxFontGroup::MakeSpaceTextRun(const Parameters *aParams, PRUint32 aFlags)
{
aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT;
static const PRUint8 space = ' ';
nsAutoPtr<gfxTextRun> textRun;
textRun = gfxTextRun::Create(aParams, &space, 1, this, aFlags);
if (!textRun)
return nsnull;
gfxFont *font = GetFontAt(0);
if (NS_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 {
textRun->SetSpaceGlyph(font, 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.forget();
}
#define UNICODE_LRO 0x202d
#define UNICODE_RLO 0x202e
#define UNICODE_PDF 0x202c
inline void
AppendDirectionalIndicatorStart(PRUint32 aFlags, nsAString& aString)
{
static const PRUnichar overrides[2] = { UNICODE_LRO, UNICODE_RLO };
aString.Append(overrides[(aFlags & gfxTextRunFactory::TEXT_IS_RTL) != 0]);
aString.Append(' ');
}
inline void
AppendDirectionalIndicatorEnd(bool aNeedDirection, nsAString& aString)
{
// append a space (always, for consistent treatment of last char,
// and a direction control if required (we skip this for 8-bit text,
// which is known to be unidirectional LTR, unless the direction was
// forced RTL via overrides)
aString.Append(' ');
if (!aNeedDirection)
return;
aString.Append('.');
aString.Append(UNICODE_PDF);
}
gfxTextRun *
gfxFontGroup::MakeTextRun(const PRUint8 *aString, PRUint32 aLength,
const Parameters *aParams, PRUint32 aFlags)
{
NS_ASSERTION(aLength > 0, "should use MakeEmptyTextRun for zero-length text");
NS_ASSERTION(aFlags & TEXT_IS_8BIT, "should be marked 8bit");
gfxTextRun *textRun = gfxTextRun::Create(aParams, aString, aLength, this, aFlags);
if (!textRun)
return nsnull;
nsDependentCSubstring cString(reinterpret_cast<const char*>(aString),
reinterpret_cast<const char*>(aString) + aLength);
nsAutoString utf16;
AppendASCIItoUTF16(cString, utf16);
InitTextRun(aParams->mContext, textRun, utf16.get(), utf16.Length());
textRun->FetchGlyphExtents(aParams->mContext);
return textRun;
}
gfxTextRun *
gfxFontGroup::MakeTextRun(const PRUnichar *aString, PRUint32 aLength,
const Parameters *aParams, PRUint32 aFlags)
{
NS_ASSERTION(aLength > 0, "should use MakeEmptyTextRun for zero-length text");
gfxTextRun *textRun = gfxTextRun::Create(aParams, aString, aLength, this, aFlags);
if (!textRun)
return nsnull;
gfxPlatform::GetPlatform()->SetupClusterBoundaries(textRun, aString);
InitTextRun(aParams->mContext, textRun, aString, aLength);
textRun->FetchGlyphExtents(aParams->mContext);
return textRun;
}
void
gfxFontGroup::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aLength)
{
// split into script runs so that script can potentially influence
// the font matching process below
gfxScriptItemizer scriptRuns(aString, aLength);
#ifdef PR_LOGGING
PRLogModuleInfo *log = (mStyle.systemFont ?
gfxPlatform::GetLog(eGfxLog_textrunui) :
gfxPlatform::GetLog(eGfxLog_textrun));
#endif
PRUint32 runStart = 0, runLimit = aLength;
PRInt32 runScript = HB_SCRIPT_LATIN;
while (scriptRuns.Next(runStart, runLimit, runScript)) {
#ifdef PR_LOGGING
if (NS_UNLIKELY(log)) {
nsCAutoString lang;
mStyle.language->ToUTF8String(lang);
PRUint32 runLen = runLimit - runStart;
PR_LOG(log, PR_LOG_DEBUG,\
("(%s) fontgroup: [%s] lang: %s script: %d len %d "
"weight: %d width: %d style: %s "
"TEXTRUN [%s] ENDTEXTRUN\n",
(mStyle.systemFont ? "textrunui" : "textrun"),
NS_ConvertUTF16toUTF8(mFamilies).get(),
lang.get(), runScript, runLen,
PRUint32(mStyle.weight), PRUint32(mStyle.stretch),
(mStyle.style & FONT_STYLE_ITALIC ? "italic" :
(mStyle.style & FONT_STYLE_OBLIQUE ? "oblique" :
"normal")),
NS_ConvertUTF16toUTF8(aString + runStart, runLen).get()));
}
#endif
InitScriptRun(aContext, aTextRun, aString, aLength,
runStart, runLimit, runScript);
}
// 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();
}
void
gfxFontGroup::InitScriptRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aTotalLength,
PRUint32 aScriptRunStart,
PRUint32 aScriptRunEnd,
PRInt32 aRunScript)
{
gfxFont *mainFont = mFonts[0].get();
PRUint32 runStart = aScriptRunStart;
nsAutoTArray<gfxTextRange,3> fontRanges;
ComputeRanges(fontRanges, aString,
aScriptRunStart, aScriptRunEnd, aRunScript);
PRUint32 numRanges = fontRanges.Length();
for (PRUint32 r = 0; r < numRanges; r++) {
const gfxTextRange& range = fontRanges[r];
PRUint32 matchedLength = range.Length();
gfxFont *matchedFont = (range.font ? range.font.get() : nsnull);
// create the glyph run for this range
if (matchedFont) {
aTextRun->AddGlyphRun(matchedFont, range.matchType,
runStart, (matchedLength > 0));
} else {
aTextRun->AddGlyphRun(mainFont, gfxTextRange::kFontGroup,
runStart, (matchedLength > 0));
}
if (matchedFont) {
// 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 = nsnull;
}
}
if (!matchedFont) {
for (PRUint32 index = runStart; index < runStart + matchedLength; index++) {
// Record the char code so we can draw a box with the Unicode value
PRUint32 ch = aString[index];
if (NS_IS_HIGH_SURROGATE(ch) &&
index + 1 < aScriptRunEnd &&
NS_IS_LOW_SURROGATE(aString[index+1])) {
aTextRun->SetMissingGlyph(index,
SURROGATE_TO_UCS4(aString[index],
aString[index+1]));
index++;
} else {
gfxFloat wid = mainFont->SynthesizeSpaceWidth(ch);
if (wid >= 0.0) {
nscoord advance =
aTextRun->GetAppUnitsPerDevUnit() * floor(wid + 0.5);
gfxTextRun::CompressedGlyph g;
if (gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance)) {
aTextRun->SetSimpleGlyph(index,
g.SetSimpleGlyph(advance,
mainFont->GetSpaceGlyph()));
} else {
gfxTextRun::DetailedGlyph detailedGlyph;
detailedGlyph.mGlyphID = mainFont->GetSpaceGlyph();
detailedGlyph.mAdvance = advance;
detailedGlyph.mXOffset = detailedGlyph.mYOffset = 0;
g.SetComplex(true, true, 1);
aTextRun->SetGlyphs(index,
g, &detailedGlyph);
}
} else {
aTextRun->SetMissingGlyph(index, ch);
}
}
}
}
runStart += matchedLength;
}
}
already_AddRefed<gfxFont>
gfxFontGroup::FindFontForChar(PRUint32 aCh, PRUint32 aPrevCh,
PRInt32 aRunScript, gfxFont *aPrevMatchedFont,
PRUint8 *aMatchType)
{
nsRefPtr<gfxFont> selectedFont;
// if this character is a join-control or the previous is a join-causer,
// use the same font as the previous range if we can
if (gfxFontUtils::IsJoinControl(aCh) || gfxFontUtils::IsJoinCauser(aPrevCh)) {
if (aPrevMatchedFont && aPrevMatchedFont->HasCharacter(aCh)) {
selectedFont = aPrevMatchedFont;
return selectedFont.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 (gfxFontUtils::IsVarSelector(aCh)) {
if (aPrevMatchedFont) {
selectedFont = aPrevMatchedFont;
return selectedFont.forget();
}
// VS alone. it's meaningless to search different fonts
return nsnull;
}
// 1. check fonts in the font group
for (PRUint32 i = 0; i < FontListLength(); i++) {
nsRefPtr<gfxFont> font = GetFontAt(i);
if (font->HasCharacter(aCh)) {
*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 nsnull;
// 2. search pref fonts
if ((selectedFont = WhichPrefFontSupportsChar(aCh))) {
*aMatchType = gfxTextRange::kPrefsFallback;
return selectedFont.forget();
}
// 3. use fallback fonts
// -- before searching for something else check the font used for the previous character
if (!selectedFont && aPrevMatchedFont && aPrevMatchedFont->HasCharacter(aCh)) {
*aMatchType = gfxTextRange::kSystemFallback;
selectedFont = aPrevMatchedFont;
return selectedFont.forget();
}
// for known "space" characters, don't do a full system-fallback search;
// we'll synthesize appropriate-width spaces instead of missing-glyph boxes
if (gfxUnicodeProperties::GetGeneralCategory(aCh) ==
HB_CATEGORY_SPACE_SEPARATOR &&
GetFontAt(0)->SynthesizeSpaceWidth(aCh) >= 0.0)
{
return nsnull;
}
// -- otherwise look for other stuff
if (!selectedFont) {
*aMatchType = gfxTextRange::kSystemFallback;
selectedFont = WhichSystemFontSupportsChar(aCh);
return selectedFont.forget();
}
return nsnull;
}
void gfxFontGroup::ComputeRanges(nsTArray<gfxTextRange>& aRanges,
const PRUnichar *aString,
PRUint32 begin, PRUint32 end,
PRInt32 aRunScript)
{
const PRUnichar *str = aString + begin;
PRUint32 len = end - begin;
aRanges.Clear();
if (len == 0) {
return;
}
PRUint32 prevCh = 0;
gfxFont *prevFont = nsnull;
PRUint8 matchType = 0;
for (PRUint32 i = 0; i < len; i++) {
const PRUint32 origI = i; // save off in case we increase for surrogate
// set up current ch
PRUint32 ch = str[i];
if ((i+1 < len) && NS_IS_HIGH_SURROGATE(ch) && NS_IS_LOW_SURROGATE(str[i+1])) {
i++;
ch = SURROGATE_TO_UCS4(ch, str[i]);
}
// find the font for this char
nsRefPtr<gfxFont> font =
FindFontForChar(ch, prevCh, aRunScript, prevFont, &matchType);
prevCh = ch;
if (aRanges.Length() == 0) {
// first char ==> make a new range
aRanges.AppendElement(gfxTextRange(0, 1, font, matchType));
prevFont = font;
} else {
// if font has changed, make a new range
gfxTextRange& prevRange = aRanges[aRanges.Length() - 1];
if (prevRange.font != font || prevRange.matchType != matchType) {
// close out the previous range
prevRange.end = origI;
aRanges.AppendElement(gfxTextRange(origI, i+1, font, matchType));
// 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 (!gfxFontUtils::IsJoinCauser(ch)) {
prevFont = font;
}
}
}
}
aRanges[aRanges.Length()-1].end = len;
}
gfxUserFontSet*
gfxFontGroup::GetUserFontSet()
{
return mUserFontSet;
}
void
gfxFontGroup::SetUserFontSet(gfxUserFontSet *aUserFontSet)
{
NS_IF_RELEASE(mUserFontSet);
mUserFontSet = aUserFontSet;
NS_IF_ADDREF(mUserFontSet);
mCurrGeneration = GetGeneration();
}
PRUint64
gfxFontGroup::GetGeneration()
{
if (!mUserFontSet)
return 0;
return mUserFontSet->GetGeneration();
}
void
gfxFontGroup::UpdateFontList()
{
if (mUserFontSet && 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();
}
}
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(PRUint32 aCh)
{
gfxFont *font;
// FindCharUnicodeRange only supports BMP character points and there are no non-BMP fonts in prefs
if (aCh > 0xFFFF)
return nsnull;
// get the pref font list if it hasn't been set up already
PRUint32 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;
NS_ADDREF(font);
return font;
}
// based on char lang and page lang, set up list of pref lang fonts to check
eFontPrefLang prefLangs[kMaxLenPrefLangList];
PRUint32 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
PRUint32 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;
NS_ADDREF(font);
return font;
}
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 nsnull;
}
already_AddRefed<gfxFont>
gfxFontGroup::WhichSystemFontSupportsChar(PRUint32 aCh)
{
gfxFontEntry *fe =
gfxPlatformFontList::PlatformFontList()->FindFontForChar(aCh, GetFontAt(0));
if (fe) {
nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&mStyle, false); // ignore bolder considerations in system fallback case...
return font.forget();
}
return nsnull;
}
/*static*/ void
gfxFontGroup::Shutdown()
{
NS_IF_RELEASE(gLangService);
}
nsILanguageAtomService* gfxFontGroup::gLangService = nsnull;
#define DEFAULT_PIXEL_FONT_SIZE 16.0f
/*static*/ void
gfxFontStyle::ParseFontFeatureSettings(const nsString& aFeatureString,
nsTArray<gfxFontFeature>& aFeatures)
{
aFeatures.Clear();
PRUint32 offset = 0;
while (offset < aFeatureString.Length()) {
// skip whitespace
while (offset < aFeatureString.Length() &&
nsCRT::IsAsciiSpace(aFeatureString[offset])) {
++offset;
}
PRInt32 limit = aFeatureString.FindChar(',', offset);
if (limit < 0) {
limit = aFeatureString.Length();
}
// check that we have enough text for a 4-char tag,
// the '=' sign, and at least one digit
if (offset + 6 <= PRUint32(limit) &&
aFeatureString[offset+4] == '=') {
gfxFontFeature setting;
setting.mTag =
((aFeatureString[offset] & 0xff) << 24) +
((aFeatureString[offset+1] & 0xff) << 16) +
((aFeatureString[offset+2] & 0xff) << 8) +
(aFeatureString[offset+3] & 0xff);
nsString valString;
aFeatureString.Mid(valString, offset+5, limit-offset-5);
PRInt32 rv;
setting.mValue = valString.ToInteger(&rv);
if (rv == NS_OK) {
// we keep the features array sorted so that we can
// use nsTArray<>::Equals() to compare feature lists
aFeatures.InsertElementSorted(setting);
}
}
offset = limit + 1;
}
}
/*static*/ PRUint32
gfxFontStyle::ParseFontLanguageOverride(const nsString& aLangTag)
{
if (!aLangTag.Length() || aLangTag.Length() > 4) {
return NO_FONT_LANGUAGE_OVERRIDE;
}
PRUint32 index, result = 0;
for (index = 0; index < aLangTag.Length(); ++index) {
PRUnichar 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() :
style(FONT_STYLE_NORMAL), systemFont(true), printerFont(false),
weight(FONT_WEIGHT_NORMAL),
stretch(NS_FONT_STRETCH_NORMAL), size(DEFAULT_PIXEL_FONT_SIZE),
sizeAdjust(0.0f),
language(gfxAtoms::x_western),
languageOverride(NO_FONT_LANGUAGE_OVERRIDE)
{
}
gfxFontStyle::gfxFontStyle(PRUint8 aStyle, PRUint16 aWeight, PRInt16 aStretch,
gfxFloat aSize, nsIAtom *aLanguage,
float aSizeAdjust, bool aSystemFont,
bool aPrinterFont,
const nsString& aFeatureSettings,
const nsString& aLanguageOverride):
style(aStyle), systemFont(aSystemFont), printerFont(aPrinterFont),
weight(aWeight), stretch(aStretch),
size(aSize), sizeAdjust(aSizeAdjust),
language(aLanguage),
languageOverride(ParseFontLanguageOverride(aLanguageOverride))
{
ParseFontFeatureSettings(aFeatureSettings, featureSettings);
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 = gfxAtoms::x_western;
}
}
gfxFontStyle::gfxFontStyle(const gfxFontStyle& aStyle) :
style(aStyle.style), systemFont(aStyle.systemFont), printerFont(aStyle.printerFont),
weight(aStyle.weight),
stretch(aStyle.stretch), size(aStyle.size),
sizeAdjust(aStyle.sizeAdjust),
language(aStyle.language),
languageOverride(aStyle.languageOverride)
{
featureSettings.AppendElements(aStyle.featureSettings);
}
PRInt8
gfxFontStyle::ComputeWeight() const
{
PRInt8 baseWeight = (weight + 50) / 100;
if (baseWeight < 0)
baseWeight = 0;
if (baseWeight > 9)
baseWeight = 9;
return baseWeight;
}
bool
gfxTextRun::GlyphRunIterator::NextRun() {
if (mNextIndex >= mTextRun->mGlyphRuns.Length())
return false;
mGlyphRun = &mTextRun->mGlyphRuns[mNextIndex];
if (mGlyphRun->mCharacterOffset >= mEndOffset)
return false;
mStringStart = NS_MAX(mStartOffset, mGlyphRun->mCharacterOffset);
PRUint32 last = mNextIndex + 1 < mTextRun->mGlyphRuns.Length()
? mTextRun->mGlyphRuns[mNextIndex + 1].mCharacterOffset : mTextRun->mCharacterCount;
mStringEnd = NS_MIN(mEndOffset, last);
++mNextIndex;
return true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
static void
AccountStorageForTextRun(gfxTextRun *aTextRun, PRInt32 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.
PRUint32 length = aTextRun->GetLength();
PRInt32 bytes = length * sizeof(gfxTextRun::CompressedGlyph);
if (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_PERSISTENT) {
bytes += length * ((aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) ? 1 : 2);
bytes += sizeof(gfxTextRun::CompressedGlyph) - 1;
bytes &= ~(sizeof(gfxTextRun::CompressedGlyph) - 1);
}
bytes += sizeof(gfxTextRun);
gTextRunStorage += bytes*aSign;
gTextRunStorageHighWaterMark = NS_MAX(gTextRunStorageHighWaterMark, gTextRunStorage);
}
#endif
static PRUint64
GlyphStorageAllocCount(PRUint32 aLength, PRUint32 aFlags)
{
// always need to allocate storage for the glyph data
PRUint64 allocCount = aLength;
// if the text is not persistent, we also need space for a copy
if (!(aFlags & gfxTextRunFactory::TEXT_IS_PERSISTENT)) {
// figure out number of extra CompressedGlyph elements we need to
// get sufficient space for the text
typedef gfxTextRun::CompressedGlyph CompressedGlyph;
if (aFlags & gfxTextRunFactory::TEXT_IS_8BIT) {
allocCount += (aLength + sizeof(CompressedGlyph) - 1) /
sizeof(CompressedGlyph);
} else {
allocCount += (aLength * sizeof(PRUnichar) +
sizeof(CompressedGlyph) - 1) /
sizeof(CompressedGlyph);
}
}
return allocCount;
}
// Helper for textRun creation to preallocate storage for glyphs and text;
// this function returns a pointer to the newly-allocated glyph storage,
// AND modifies the aText parameter if TEXT_IS_PERSISTENT was not set.
// In that case, the text is appended to the glyph storage, so a single
// delete[] operation in the textRun destructor will free both.
// Returns nsnull if allocation fails.
gfxTextRun::CompressedGlyph *
gfxTextRun::AllocateStorage(const void*& aText, PRUint32 aLength, PRUint32 aFlags)
{
// Here, we rely on CompressedGlyph being the largest unit we care about for
// allocation/alignment of either glyph data or text, so we allocate an array
// of CompressedGlyphs, then take the last chunk of that and cast a pointer to
// PRUint8* or PRUnichar* for text storage.
PRUint64 allocCount = GlyphStorageAllocCount(aLength, aFlags);
// allocate the storage we need, returning nsnull on failure rather than
// throwing an exception (because web content can create huge runs)
CompressedGlyph *storage = new (std::nothrow) CompressedGlyph[allocCount];
if (!storage) {
NS_WARNING("failed to allocate glyph/text storage for text run!");
return nsnull;
}
// copy the text if we need to keep a copy in the textrun
if (!(aFlags & gfxTextRunFactory::TEXT_IS_PERSISTENT)) {
if (aFlags & gfxTextRunFactory::TEXT_IS_8BIT) {
PRUint8 *newText = reinterpret_cast<PRUint8*>(storage + aLength);
memcpy(newText, aText, aLength);
aText = newText;
} else {
PRUnichar *newText = reinterpret_cast<PRUnichar*>(storage + aLength);
memcpy(newText, aText, aLength*sizeof(PRUnichar));
aText = newText;
}
}
return storage;
}
gfxTextRun *
gfxTextRun::Create(const gfxTextRunFactory::Parameters *aParams, const void *aText,
PRUint32 aLength, gfxFontGroup *aFontGroup, PRUint32 aFlags)
{
CompressedGlyph *glyphStorage = AllocateStorage(aText, aLength, aFlags);
if (!glyphStorage) {
return nsnull;
}
return new gfxTextRun(aParams, aText, aLength, aFontGroup, aFlags, glyphStorage);
}
gfxTextRun::gfxTextRun(const gfxTextRunFactory::Parameters *aParams, const void *aText,
PRUint32 aLength, gfxFontGroup *aFontGroup, PRUint32 aFlags,
CompressedGlyph *aGlyphStorage)
: mCharacterGlyphs(aGlyphStorage),
mUserData(aParams->mUserData),
mFontGroup(aFontGroup),
mAppUnitsPerDevUnit(aParams->mAppUnitsPerDevUnit),
mFlags(aFlags), mCharacterCount(aLength), mHashCode(0)
{
NS_ASSERTION(mAppUnitsPerDevUnit != 0, "Invalid app unit scale");
MOZ_COUNT_CTOR(gfxTextRun);
NS_ADDREF(mFontGroup);
if (aParams->mSkipChars) {
mSkipChars.TakeFrom(aParams->mSkipChars);
}
if (mFlags & gfxTextRunFactory::TEXT_IS_8BIT) {
mText.mSingle = static_cast<const PRUint8 *>(aText);
} else {
mText.mDouble = static_cast<const PRUnichar *>(aText);
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
AccountStorageForTextRun(this, 1);
#endif
mUserFontSetGeneration = mFontGroup->GetGeneration();
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
// this will also delete the text, if it is owned by the run,
// because we merge the storage allocations
delete [] mCharacterGlyphs;
NS_RELEASE(mFontGroup);
MOZ_COUNT_DTOR(gfxTextRun);
}
bool
gfxTextRun::SetPotentialLineBreaks(PRUint32 aStart, PRUint32 aLength,
PRUint8 *aBreakBefore,
gfxContext *aRefContext)
{
NS_ASSERTION(aStart + aLength <= mCharacterCount, "Overflow");
if (!mCharacterGlyphs)
return true;
PRUint32 changed = 0;
PRUint32 i;
for (i = 0; i < aLength; ++i) {
PRUint8 canBreak = aBreakBefore[i];
if (canBreak && !mCharacterGlyphs[aStart + 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 |= mCharacterGlyphs[aStart + i].SetCanBreakBefore(canBreak);
}
return changed != 0;
}
gfxTextRun::LigatureData
gfxTextRun::ComputeLigatureData(PRUint32 aPartStart, PRUint32 aPartEnd,
PropertyProvider *aProvider)
{
NS_ASSERTION(aPartStart < aPartEnd, "Computing ligature data for empty range");
NS_ASSERTION(aPartEnd <= mCharacterCount, "Character length overflow");
LigatureData result;
CompressedGlyph *charGlyphs = mCharacterGlyphs;
PRUint32 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 < mCharacterCount && !charGlyphs[i].IsLigatureGroupStart(); ++i) {
}
result.mLigatureEnd = i;
PRInt32 ligatureWidth =
GetAdvanceForGlyphs(result.mLigatureStart, result.mLigatureEnd);
// Count the number of started clusters we have seen
PRUint32 totalClusterCount = 0;
PRUint32 partClusterIndex = 0;
PRUint32 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 = ligatureWidth*partClusterIndex/totalClusterCount;
result.mPartWidth = ligatureWidth*partClusterCount/totalClusterCount;
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(PRUint32 aPartStart, PRUint32 aPartEnd,
PropertyProvider *aProvider)
{
if (aPartStart >= aPartEnd)
return 0;
LigatureData data = ComputeLigatureData(aPartStart, aPartEnd, aProvider);
return data.mPartWidth;
}
PRInt32
gfxTextRun::GetAdvanceForGlyphs(PRUint32 aStart, PRUint32 aEnd)
{
const CompressedGlyph *glyphData = mCharacterGlyphs + aStart;
PRInt32 advance = 0;
PRUint32 i;
for (i = aStart; i < aEnd; ++i, ++glyphData) {
if (glyphData->IsSimpleGlyph()) {
advance += glyphData->GetSimpleAdvance();
} else {
PRUint32 glyphCount = glyphData->GetGlyphCount();
if (glyphCount == 0) {
continue;
}
const DetailedGlyph *details = GetDetailedGlyphs(i);
if (details) {
PRUint32 j;
for (j = 0; j < glyphCount; ++j, ++details) {
advance += details->mAdvance;
}
}
}
}
return advance;
}
static void
GetAdjustedSpacing(gfxTextRun *aTextRun, PRUint32 aStart, PRUint32 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();
PRUint32 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(PRUint32 aStart, PRUint32 aEnd,
PropertyProvider *aProvider,
PRUint32 aSpacingStart, PRUint32 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(PRUint32 *aStart, PRUint32 *aEnd)
{
if (*aStart >= *aEnd)
return;
CompressedGlyph *charGlyphs = mCharacterGlyphs;
while (*aStart < *aEnd && !charGlyphs[*aStart].IsLigatureGroupStart()) {
++(*aStart);
}
if (*aEnd < mCharacterCount) {
while (*aEnd > *aStart && !charGlyphs[*aEnd].IsLigatureGroupStart()) {
--(*aEnd);
}
}
}
void
gfxTextRun::DrawGlyphs(gfxFont *aFont, gfxContext *aContext,
bool aDrawToPath, gfxPoint *aPt,
PRUint32 aStart, PRUint32 aEnd,
PropertyProvider *aProvider,
PRUint32 aSpacingStart, PRUint32 aSpacingEnd)
{
nsAutoTArray<PropertyProvider::Spacing,200> spacingBuffer;
bool haveSpacing = GetAdjustedSpacingArray(aStart, aEnd, aProvider,
aSpacingStart, aSpacingEnd, &spacingBuffer);
aFont->Draw(this, aStart, aEnd, aContext, aDrawToPath, aPt,
haveSpacing ? spacingBuffer.Elements() : nsnull);
}
static void
ClipPartialLigature(gfxTextRun *aTextRun, gfxFloat *aLeft, gfxFloat *aRight,
gfxFloat aXOrigin, gfxTextRun::LigatureData *aLigature)
{
if (aLigature->mClipBeforePart) {
if (aTextRun->IsRightToLeft()) {
*aRight = NS_MIN(*aRight, aXOrigin);
} else {
*aLeft = NS_MAX(*aLeft, aXOrigin);
}
}
if (aLigature->mClipAfterPart) {
gfxFloat endEdge = aXOrigin + aTextRun->GetDirection()*aLigature->mPartWidth;
if (aTextRun->IsRightToLeft()) {
*aLeft = NS_MAX(*aLeft, endEdge);
} else {
*aRight = NS_MIN(*aRight, endEdge);
}
}
}
void
gfxTextRun::DrawPartialLigature(gfxFont *aFont, gfxContext *aCtx,
PRUint32 aStart, PRUint32 aEnd,
gfxPoint *aPt,
PropertyProvider *aProvider)
{
if (aStart >= aEnd)
return;
// 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);
// 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);
aCtx->Save();
aCtx->NewPath();
// 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->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, false, &pt, data.mLigatureStart,
data.mLigatureEnd, aProvider, aStart, aEnd);
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, PRUint32 aStart, PRUint32 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, PRUint32 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(gfxASurface::CONTENT_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::AdjustAdvancesForSyntheticBold(gfxContext *aContext,
PRUint32 aStart,
PRUint32 aLength)
{
const PRUint32 appUnitsPerDevUnit = GetAppUnitsPerDevUnit();
bool isRTL = IsRightToLeft();
GlyphRunIterator iter(this, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
if (font->IsSyntheticBold()) {
PRUint32 synAppUnitOffset =
font->GetSyntheticBoldOffset() *
appUnitsPerDevUnit * CalcXScale(aContext);
PRUint32 start = iter.GetStringStart();
PRUint32 end = iter.GetStringEnd();
PRUint32 i;
// iterate over glyphs, start to end
for (i = start; i < end; ++i) {
gfxTextRun::CompressedGlyph *glyphData = &mCharacterGlyphs[i];
if (glyphData->IsSimpleGlyph()) {
// simple glyphs ==> just add the advance
PRInt32 advance = glyphData->GetSimpleAdvance() + synAppUnitOffset;
if (CompressedGlyph::IsSimpleAdvance(advance)) {
glyphData->SetSimpleGlyph(advance, glyphData->GetSimpleGlyph());
} else {
// rare case, tested by making this the default
PRUint32 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
PRUint32 detailedLength = glyphData->GetGlyphCount();
if (detailedLength) {
gfxTextRun::DetailedGlyph *details = GetDetailedGlyphs(i);
if (!details) {
continue;
}
if (isRTL) {
details[0].mAdvance += synAppUnitOffset;
} else {
details[detailedLength - 1].mAdvance += synAppUnitOffset;
}
}
}
}
}
}
}
void
gfxTextRun::Draw(gfxContext *aContext, gfxPoint aPt,
PRUint32 aStart, PRUint32 aLength,
PropertyProvider *aProvider, gfxFloat *aAdvanceWidth)
{
NS_ASSERTION(aStart + aLength <= mCharacterCount, "Substring out of range");
gfxFloat direction = GetDirection();
if (mSkipDrawing) {
// We're waiting for a user font to finish downloading;
// 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 (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;
PRUint32 start = iter.GetStringStart();
PRUint32 end = iter.GetStringEnd();
PRUint32 ligatureRunStart = start;
PRUint32 ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
DrawPartialLigature(font, aContext, start, ligatureRunStart, &pt, aProvider);
DrawGlyphs(font, aContext, false, &pt, ligatureRunStart,
ligatureRunEnd, aProvider, ligatureRunStart, ligatureRunEnd);
DrawPartialLigature(font, aContext, ligatureRunEnd, end, &pt, aProvider);
}
// composite result when synthetic bolding used
if (needToRestore) {
syntheticBoldBuffer.PopAlpha();
}
if (aAdvanceWidth) {
*aAdvanceWidth = (pt.x - aPt.x)*direction;
}
}
void
gfxTextRun::DrawToPath(gfxContext *aContext, gfxPoint aPt,
PRUint32 aStart, PRUint32 aLength,
PropertyProvider *aProvider, gfxFloat *aAdvanceWidth)
{
NS_ASSERTION(aStart + aLength <= mCharacterCount, "Substring out of range");
gfxFloat direction = GetDirection();
gfxPoint pt = aPt;
GlyphRunIterator iter(this, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
PRUint32 start = iter.GetStringStart();
PRUint32 end = iter.GetStringEnd();
PRUint32 ligatureRunStart = start;
PRUint32 ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
NS_ASSERTION(ligatureRunStart == start,
"Can't draw path starting inside ligature");
NS_ASSERTION(ligatureRunEnd == end,
"Can't end drawing path inside ligature");
DrawGlyphs(font, aContext, true, &pt, ligatureRunStart, ligatureRunEnd, aProvider,
ligatureRunStart, ligatureRunEnd);
}
if (aAdvanceWidth) {
*aAdvanceWidth = (pt.x - aPt.x)*direction;
}
}
void
gfxTextRun::AccumulateMetricsForRun(gfxFont *aFont,
PRUint32 aStart, PRUint32 aEnd,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
PropertyProvider *aProvider,
PRUint32 aSpacingStart, PRUint32 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() : nsnull);
aMetrics->CombineWith(metrics, IsRightToLeft());
}
void
gfxTextRun::AccumulatePartialLigatureMetrics(gfxFont *aFont,
PRUint32 aStart, PRUint32 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(PRUint32 aStart, PRUint32 aLength,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
PropertyProvider *aProvider)
{
NS_ASSERTION(aStart + aLength <= mCharacterCount, "Substring out of range");
Metrics accumulatedMetrics;
GlyphRunIterator iter(this, aStart, aLength);
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
PRUint32 start = iter.GetStringStart();
PRUint32 end = iter.GetStringEnd();
PRUint32 ligatureRunStart = start;
PRUint32 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
PRUint32
gfxTextRun::BreakAndMeasureText(PRUint32 aStart, PRUint32 aMaxLength,
bool aLineBreakBefore, gfxFloat aWidth,
PropertyProvider *aProvider,
bool aSuppressInitialBreak,
gfxFloat *aTrimWhitespace,
Metrics *aMetrics,
gfxFont::BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
bool *aUsedHyphenation,
PRUint32 *aLastBreak,
bool aCanWordWrap,
gfxBreakPriority *aBreakPriority)
{
aMaxLength = NS_MIN(aMaxLength, mCharacterCount - aStart);
NS_ASSERTION(aStart + aMaxLength <= mCharacterCount, "Substring out of range");
PRUint32 bufferStart = aStart;
PRUint32 bufferLength = NS_MIN<PRUint32>(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
PRUint32 trimmableChars = 0;
// The amount of space removed by ignoring trimmableChars
gfxFloat trimmableAdvance = 0;
PRInt32 lastBreak = -1;
PRInt32 lastBreakTrimmableChars = -1;
gfxFloat lastBreakTrimmableAdvance = -1;
bool aborted = false;
PRUint32 end = aStart + aMaxLength;
bool lastBreakUsedHyphenation = false;
PRUint32 ligatureRunStart = aStart;
PRUint32 ligatureRunEnd = end;
ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd);
PRUint32 i;
for (i = aStart; i < end; ++i) {
if (i >= bufferStart + bufferLength) {
// Fetch more spacing and hyphenation data
bufferStart = i;
bufferLength = NS_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 lineBreakHere = mCharacterGlyphs[i].CanBreakBefore() == 1;
bool hyphenation = haveHyphenation && hyphenBuffer[i - bufferStart];
bool wordWrapping = aCanWordWrap && *aBreakPriority <= eWordWrapBreak;
if (lineBreakHere || hyphenation || wordWrapping) {
gfxFloat hyphenatedAdvance = advance;
if (!lineBreakHere && !wordWrapping) {
hyphenatedAdvance += aProvider->GetHyphenWidth();
}
if (lastBreak < 0 || width + hyphenatedAdvance - trimmableAdvance <= aWidth) {
// We can break here.
lastBreak = i;
lastBreakTrimmableChars = trimmableChars;
lastBreakTrimmableAdvance = trimmableAdvance;
lastBreakUsedHyphenation = !lineBreakHere && !wordWrapping;
*aBreakPriority = hyphenation || lineBreakHere ?
eNormalBreak : 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 (GetChar(i) == ' ') {
++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)
PRUint32 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 = PR_UINT32_MAX;
} else {
*aLastBreak = lastBreak - aStart;
}
}
return charsFit;
}
gfxFloat
gfxTextRun::GetAdvanceWidth(PRUint32 aStart, PRUint32 aLength,
PropertyProvider *aProvider)
{
NS_ASSERTION(aStart + aLength <= mCharacterCount, "Substring out of range");
PRUint32 ligatureRunStart = aStart;
PRUint32 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)) {
PRUint32 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(PRUint32 aStart, PRUint32 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;
}
PRUint32
gfxTextRun::FindFirstGlyphRunContaining(PRUint32 aOffset)
{
NS_ASSERTION(aOffset <= mCharacterCount, "Bad offset looking for glyphrun");
NS_ASSERTION(mCharacterCount == 0 || mGlyphRuns.Length() > 0,
"non-empty text but no glyph runs present!");
if (aOffset == mCharacterCount)
return mGlyphRuns.Length();
PRUint32 start = 0;
PRUint32 end = mGlyphRuns.Length();
while (end - start > 1) {
PRUint32 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, PRUint8 aMatchType,
PRUint32 aUTF16Offset, bool aForceNewRun)
{
PRUint32 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();
PRUint32 i;
for (i = 0; i < runs.Length(); ++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)
PRInt32 i, lastRunIndex = mGlyphRuns.Length() - 1;
for (i = lastRunIndex; i >= 0; --i) {
GlyphRun& run = mGlyphRuns[i];
while (mCharacterGlyphs[run.mCharacterOffset].IsLigatureContinuation() &&
run.mCharacterOffset < mCharacterCount) {
run.mCharacterOffset++;
}
// if the run has become empty, eliminate it
if ((i < lastRunIndex &&
run.mCharacterOffset >= mGlyphRuns[i+1].mCharacterOffset) ||
(i == lastRunIndex && run.mCharacterOffset == mCharacterCount)) {
mGlyphRuns.RemoveElementAt(i);
--lastRunIndex;
}
}
}
PRUint32
gfxTextRun::CountMissingGlyphs()
{
PRUint32 i;
PRUint32 count = 0;
for (i = 0; i < mCharacterCount; ++i) {
if (mCharacterGlyphs[i].IsMissing()) {
++count;
}
}
return count;
}
gfxTextRun::DetailedGlyph *
gfxTextRun::AllocateDetailedGlyphs(PRUint32 aIndex, PRUint32 aCount)
{
NS_ASSERTION(aIndex < mCharacterCount, "Index out of range");
if (!mCharacterGlyphs) {
return nsnull;
}
if (!mDetailedGlyphs) {
mDetailedGlyphs = new DetailedGlyphStore();
}
DetailedGlyph *details = mDetailedGlyphs->Allocate(aIndex, aCount);
if (!details) {
mCharacterGlyphs[aIndex].SetMissing(0);
return nsnull;
}
return details;
}
void
gfxTextRun::SetGlyphs(PRUint32 aIndex, CompressedGlyph aGlyph,
const DetailedGlyph *aGlyphs)
{
NS_ASSERTION(!aGlyph.IsSimpleGlyph(), "Simple glyphs not handled here");
NS_ASSERTION(aIndex > 0 ||
(aGlyph.IsClusterStart() && aGlyph.IsLigatureGroupStart()),
"First character must be the start of a cluster and can't be a ligature continuation!");
PRUint32 glyphCount = aGlyph.GetGlyphCount();
if (glyphCount > 0) {
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, glyphCount);
if (!details)
return;
memcpy(details, aGlyphs, sizeof(DetailedGlyph)*glyphCount);
}
mCharacterGlyphs[aIndex] = aGlyph;
}
#include "ignorable.x-ccmap"
DEFINE_X_CCMAP(gIgnorableCCMapExt, const);
static inline bool
IsDefaultIgnorable(PRUint32 aChar)
{
return CCMAP_HAS_CHAR_EXT(gIgnorableCCMapExt, aChar);
}
void
gfxTextRun::SetMissingGlyph(PRUint32 aIndex, PRUint32 aChar)
{
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
if (!details)
return;
details->mGlyphID = aChar;
GlyphRun *glyphRun = &mGlyphRuns[FindFirstGlyphRunContaining(aIndex)];
if (IsDefaultIgnorable(aChar)) {
// Setting advance width to zero will prevent drawing the hexbox
details->mAdvance = 0;
} else {
gfxFloat width = NS_MAX(glyphRun->mFont->GetMetrics().aveCharWidth,
gfxFontMissingGlyphs::GetDesiredMinWidth(aChar));
details->mAdvance = PRUint32(width*GetAppUnitsPerDevUnit());
}
details->mXOffset = 0;
details->mYOffset = 0;
mCharacterGlyphs[aIndex].SetMissing(1);
}
bool
gfxTextRun::FilterIfIgnorable(PRUint32 aIndex)
{
PRUint32 ch = GetChar(aIndex);
if (IsDefaultIgnorable(ch)) {
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
if (details) {
details->mGlyphID = ch;
details->mAdvance = 0;
details->mXOffset = 0;
details->mYOffset = 0;
mCharacterGlyphs[aIndex].SetMissing(1);
return true;
}
}
return false;
}
void
gfxTextRun::CopyGlyphDataFrom(gfxTextRun *aSource, PRUint32 aStart,
PRUint32 aLength, PRUint32 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
for (PRUint32 i = 0; i < aLength; ++i) {
CompressedGlyph g = aSource->mCharacterGlyphs[i + aStart];
g.SetCanBreakBefore(mCharacterGlyphs[i + aDest].CanBreakBefore());
if (!g.IsSimpleGlyph()) {
PRUint32 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);
}
}
}
mCharacterGlyphs[i + aDest] = g;
}
// Copy glyph runs
GlyphRunIterator iter(aSource, aStart, aLength);
#ifdef DEBUG
gfxFont *lastFont = nsnull;
#endif
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
NS_ASSERTION(font != lastFont, "Glyphruns not coalesced?");
#ifdef DEBUG
lastFont = font;
PRUint32 end = iter.GetStringEnd();
#endif
PRUint32 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, PRUint32 aCharIndex)
{
PRUint32 spaceGlyph = aFont->GetSpaceGlyph();
float spaceWidth = aFont->GetMetrics().spaceWidth;
PRUint32 spaceWidthAppUnits = NS_lroundf(spaceWidth*mAppUnitsPerDevUnit);
if (!spaceGlyph ||
!CompressedGlyph::IsSimpleGlyphID(spaceGlyph) ||
!CompressedGlyph::IsSimpleAdvance(spaceWidthAppUnits)) {
gfxTextRunFactory::Parameters params = {
aContext, nsnull, nsnull, nsnull, 0, mAppUnitsPerDevUnit
};
static const PRUint8 space = ' ';
nsAutoPtr<gfxTextRun> textRun;
textRun = mFontGroup->MakeTextRun(&space, 1, ¶ms,
gfxTextRunFactory::TEXT_IS_8BIT | gfxTextRunFactory::TEXT_IS_ASCII |
gfxTextRunFactory::TEXT_IS_PERSISTENT);
if (!textRun || !textRun->mCharacterGlyphs)
return;
CopyGlyphDataFrom(textRun, 0, 1, aCharIndex);
return;
}
AddGlyphRun(aFont, gfxTextRange::kFontGroup, aCharIndex, false);
CompressedGlyph g;
g.SetSimpleGlyph(spaceWidthAppUnits, spaceGlyph);
SetSimpleGlyph(aCharIndex, g);
}
void
gfxTextRun::FetchGlyphExtents(gfxContext *aRefContext)
{
bool needsGlyphExtents = NeedsGlyphExtents(this);
if (!needsGlyphExtents && !mDetailedGlyphs)
return;
PRUint32 i;
CompressedGlyph *charGlyphs = mCharacterGlyphs;
for (i = 0; i < mGlyphRuns.Length(); ++i) {
gfxFont *font = mGlyphRuns[i].mFont;
PRUint32 start = mGlyphRuns[i].mCharacterOffset;
PRUint32 end = i + 1 < mGlyphRuns.Length()
? mGlyphRuns[i + 1].mCharacterOffset : GetLength();
bool fontIsSetup = false;
PRUint32 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) {
PRUint32 glyphIndex = glyphData->GetSimpleGlyph();
if (!extents->IsGlyphKnown(glyphIndex)) {
if (!fontIsSetup) {
font->SetupCairoFont(aRefContext);
fontIsSetup = true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gGlyphExtentsSetupEagerSimple;
#endif
font->SetupGlyphExtents(aRefContext, glyphIndex, false, extents);
}
}
} else if (!glyphData->IsMissing()) {
PRUint32 glyphCount = glyphData->GetGlyphCount();
if (glyphCount == 0) {
continue;
}
const gfxTextRun::DetailedGlyph *details = GetDetailedGlyphs(j);
if (!details) {
continue;
}
for (PRUint32 k = 0; k < glyphCount; ++k, ++details) {
PRUint32 glyphIndex = details->mGlyphID;
if (!extents->IsGlyphKnownWithTightExtents(glyphIndex)) {
if (!fontIsSetup) {
font->SetupCairoFont(aRefContext);
fontIsSetup = true;
}
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gGlyphExtentsSetupEagerTight;
#endif
font->SetupGlyphExtents(aRefContext, glyphIndex, true, extents);
}
}
}
}
}
}
gfxTextRun::ClusterIterator::ClusterIterator(gfxTextRun *aTextRun)
: mTextRun(aTextRun), mCurrentChar(PRUint32(-1))
{
}
void
gfxTextRun::ClusterIterator::Reset()
{
mCurrentChar = PRUint32(-1);
}
bool
gfxTextRun::ClusterIterator::NextCluster()
{
while (++mCurrentChar < mTextRun->GetLength()) {
if (mTextRun->IsClusterStart(mCurrentChar)) {
return true;
}
}
mCurrentChar = PRUint32(-1);
return false;
}
PRUint32
gfxTextRun::ClusterIterator::ClusterLength() const
{
if (mCurrentChar == PRUint32(-1)) {
return 0;
}
PRUint32 i = mCurrentChar;
while (++i < mTextRun->GetLength()) {
if (mTextRun->IsClusterStart(i)) {
break;
}
}
return i - mCurrentChar;
}
gfxFloat
gfxTextRun::ClusterIterator::ClusterAdvance(PropertyProvider *aProvider) const
{
if (mCurrentChar == PRUint32(-1)) {
return 0;
}
return mTextRun->GetAdvanceWidth(mCurrentChar, ClusterLength(), aProvider);
}
PRUint64
gfxTextRun::ComputeSize()
{
PRUint64 total = moz_malloc_usable_size(this);
if (total == 0) {
total = sizeof(gfxTextRun);
}
PRUint64 glyphDataSize = moz_malloc_usable_size(mCharacterGlyphs);
if (glyphDataSize == 0) {
// calculate how much gfxTextRun::AllocateStorage would have allocated
glyphDataSize = sizeof(CompressedGlyph) *
GlyphStorageAllocCount(mCharacterCount, mFlags);
}
total += glyphDataSize;
if (mDetailedGlyphs) {
total += mDetailedGlyphs->SizeOf();
}
total += mGlyphRuns.SizeOf();
return total;
}
#ifdef DEBUG
void
gfxTextRun::Dump(FILE* aOutput) {
if (!aOutput) {
aOutput = stdout;
}
PRUint32 i;
fputc('"', aOutput);
for (i = 0; i < mCharacterCount; ++i) {
PRUnichar ch = GetChar(i);
if (ch >= 32 && ch < 128) {
fputc(ch, aOutput);
} else {
fprintf(aOutput, "\\u%4x", ch);
}
}
fputs("\" [", 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());
nsCAutoString 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
