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gecko-dev/gfx/thebes/gfxTextRunWordCache.cpp

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/* -*- 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) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir@pobox.com>
* Ehsan Akhgari <ehsan.akhgari@gmail.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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxTextRunWordCache.h"
#include "nsWeakReference.h"
#include "nsCRT.h"
#include "nsServiceManagerUtils.h"
#include "nsIPrefBranch.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "nsIObserver.h"
#include "nsBidiUtils.h"
#ifdef DEBUG
#include <stdio.h>
#endif
/**
* Cache individual "words" (strings delimited by white-space or white-space-like
* characters that don't involve kerning or ligatures) in textruns.
*
* The characters treated as word boundaries are defined by IsWordBoundary
* below. The characters are: space, NBSP, and all the characters
* defined by gfxFontGroup::IsInvalidChar. The latter are all converted
* to invisible missing glyphs in this code. Thus, this class ensures
* that none of those invalid characters are ever passed to platform
* textrun implementations.
*
* Some platforms support marks combining with spaces to form clusters.
* In such cases we treat "before the space" as a word boundary but
* "after the space" is not a word boundary; words with a leading space
* are kept out of the cache. Also, words at the start of text, which start
* with combining marks that would combine with a space if there was one,
* are also kept out of the cache.
*/
class TextRunWordCache :
public nsIObserver,
public nsSupportsWeakReference {
public:
TextRunWordCache() :
mBidiNumeral(0) {
mCache.Init(100);
}
~TextRunWordCache() {
Uninit();
NS_WARN_IF_FALSE(mCache.Count() == 0, "Textrun cache not empty!");
}
void Init();
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
/**
* Create a textrun using cached words.
* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
* treated as invisible missing.
* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
* if applicable
* @param aIsInCache if true is returned, then RemoveTextRun must be called
* before the textrun changes or dies.
*/
gfxTextRun *MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags);
/**
* Create a textrun using cached words.
* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
* treated as invisible missing.
* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
* if applicable
* @param aIsInCache if true is returned, then RemoveTextRun must be called
* before the textrun changes or dies.
*/
gfxTextRun *MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags);
/**
* Remove a textrun from the cache. This must be called before aTextRun
* is deleted! The text in the textrun must still be valid.
*/
void RemoveTextRun(gfxTextRun *aTextRun);
/**
* Flush all cached runs. Use when a setting change makes them obsolete.
*/
void Flush() {
mCache.Clear();
#ifdef DEBUG
mGeneration++;
#endif
}
#ifdef DEBUG
PRUint32 mGeneration;
void Dump();
#endif
protected:
struct CacheHashKey {
void *mFontOrGroup;
const void *mString;
PRUint32 mLength;
PRUint32 mAppUnitsPerDevUnit;
PRUint32 mStringHash;
PRUint64 mUserFontSetGeneration;
PRPackedBool mIsDoubleByteText;
PRPackedBool mIsRTL;
PRPackedBool mEnabledOptionalLigatures;
PRPackedBool mOptimizeSpeed;
CacheHashKey(gfxTextRun *aBaseTextRun, void *aFontOrGroup,
PRUint32 aStart, PRUint32 aLength, PRUint32 aHash)
: mFontOrGroup(aFontOrGroup), mString(aBaseTextRun->GetTextAt(aStart)),
mLength(aLength),
mAppUnitsPerDevUnit(aBaseTextRun->GetAppUnitsPerDevUnit()),
mStringHash(aHash),
mUserFontSetGeneration(aBaseTextRun->GetUserFontSetGeneration()),
mIsDoubleByteText((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) == 0),
mIsRTL(aBaseTextRun->IsRightToLeft()),
mEnabledOptionalLigatures((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES) == 0),
mOptimizeSpeed((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_OPTIMIZE_SPEED) != 0)
{
}
};
class CacheHashEntry : public PLDHashEntryHdr {
public:
typedef const CacheHashKey &KeyType;
typedef const CacheHashKey *KeyTypePointer;
// When constructing a new entry in the hashtable, the caller of Put()
// will fill us in.
CacheHashEntry(KeyTypePointer aKey) : mTextRun(nsnull), mWordOffset(0),
mHashedByFont(PR_FALSE) { }
CacheHashEntry(const CacheHashEntry& toCopy) { NS_ERROR("Should not be called"); }
~CacheHashEntry() { }
PRBool KeyEquals(const KeyTypePointer aKey) const;
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
static PLDHashNumber HashKey(const KeyTypePointer aKey);
enum { ALLOW_MEMMOVE = PR_TRUE };
gfxTextRun *mTextRun;
// The offset of the start of the word in the textrun. The length of
// the word is not stored here because we can figure it out by
// looking at the textrun's text.
PRUint32 mWordOffset:31;
// This is set to true when the cache entry was hashed by the first
// font in mTextRun's fontgroup; it's false when the cache entry
// was hashed by the fontgroup itself.
PRUint32 mHashedByFont:1;
};
// Used to track words that should be copied from one textrun to
// another during the textrun construction process
struct DeferredWord {
gfxTextRun *mSourceTextRun;
PRUint32 mSourceOffset;
PRUint32 mDestOffset;
PRUint32 mLength;
PRUint32 mHash;
};
PRBool LookupWord(gfxTextRun *aTextRun, gfxFont *aFirstFont,
PRUint32 aStart, PRUint32 aEnd, PRUint32 aHash,
nsTArray<DeferredWord>* aDeferredWords);
void FinishTextRun(gfxTextRun *aTextRun, gfxTextRun *aNewRun,
const gfxFontGroup::Parameters *aParams,
const nsTArray<DeferredWord>& aDeferredWords,
PRBool aSuccessful);
void RemoveWord(gfxTextRun *aTextRun, PRUint32 aStart,
PRUint32 aEnd, PRUint32 aHash);
void Uninit();
nsTHashtable<CacheHashEntry> mCache;
PRInt32 mBidiNumeral;
nsCOMPtr<nsIPrefBranch2> mPrefBranch;
nsCOMPtr<nsIPrefBranch2> mFontPrefBranch;
#ifdef DEBUG
static PLDHashOperator CacheDumpEntry(CacheHashEntry* aEntry, void* userArg);
#endif
};
NS_IMPL_ISUPPORTS2(TextRunWordCache, nsIObserver, nsISupportsWeakReference)
static TextRunWordCache *gTextRunWordCache = nsnull;
static PRLogModuleInfo *gWordCacheLog = PR_NewLogModule("wordCache");
void
TextRunWordCache::Init()
{
#ifdef DEBUG
mGeneration = 0;
#endif
nsCOMPtr<nsIPrefService> prefService = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefService)
return;
nsCOMPtr<nsIPrefBranch> branch;
prefService->GetBranch("bidi.", getter_AddRefs(branch));
mPrefBranch = do_QueryInterface(branch);
if (!mPrefBranch)
return;
mPrefBranch->AddObserver("", this, PR_TRUE);
mPrefBranch->GetIntPref("numeral", &mBidiNumeral);
nsCOMPtr<nsIPrefBranch> fontBranch;
prefService->GetBranch("font.", getter_AddRefs(fontBranch));
mFontPrefBranch = do_QueryInterface(fontBranch);
if (mFontPrefBranch)
mFontPrefBranch->AddObserver("", this, PR_TRUE);
}
void
TextRunWordCache::Uninit()
{
if (mPrefBranch)
mPrefBranch->RemoveObserver("", this);
if (mFontPrefBranch)
mFontPrefBranch->RemoveObserver("", this);
}
NS_IMETHODIMP
TextRunWordCache::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *aData)
{
if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
if (!nsCRT::strcmp(aData, NS_LITERAL_STRING("numeral").get())) {
mPrefBranch->GetIntPref("numeral", &mBidiNumeral);
}
mCache.Clear();
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("flushing the textrun cache"));
#ifdef DEBUG
mGeneration++;
#endif
}
return NS_OK;
}
static inline PRUint32
HashMix(PRUint32 aHash, PRUnichar aCh)
{
return (aHash >> 28) ^ (aHash << 4) ^ aCh;
}
// If the substring of the textrun is rendered entirely in the first font
// of the textrun's fontgroup, then return that font. Otherwise return the
// fontgroup. When a user font set is in use, always return the font group.
static void *GetWordFontOrGroup(gfxTextRun *aTextRun, PRUint32 aOffset,
PRUint32 aLength)
{
gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
if (fontGroup->GetUserFontSet() != nsnull)
return fontGroup;
PRUint32 glyphRunCount;
const gfxTextRun::GlyphRun *glyphRuns = aTextRun->GetGlyphRuns(&glyphRunCount);
PRUint32 glyphRunIndex = aTextRun->FindFirstGlyphRunContaining(aOffset);
gfxFont *firstFont = fontGroup->GetFontAt(0);
if (glyphRuns[glyphRunIndex].mFont != firstFont)
return fontGroup;
PRUint32 glyphRunEnd = glyphRunIndex == glyphRunCount - 1
? aTextRun->GetLength() : glyphRuns[glyphRunIndex + 1].mCharacterOffset;
if (aOffset + aLength <= glyphRunEnd)
return firstFont;
return fontGroup;
}
#define UNICODE_NBSP 0x00A0
// XXX should we treat NBSP or SPACE combined with other characters as a word
// boundary? Currently this does.
static PRBool
IsBoundarySpace(PRUnichar aChar)
{
return aChar == ' ' || aChar == UNICODE_NBSP;
}
static PRBool
IsWordBoundary(PRUnichar aChar)
{
return IsBoundarySpace(aChar) || gfxFontGroup::IsInvalidChar(aChar);
}
/**
* Looks up a word in the cache. If the word is found in the cache
* (which could be from an existing textrun or an earlier word in the same
* textrun), we copy the glyphs from the word into the textrun, unless
* aDeferredWords is non-null (meaning that all words from now on must be
* copied later instead of now), in which case we add the word to be copied
* to the list.
*
* If the word is not found in the cache then we add it to the cache with
* aFirstFont as the key, on the assumption that the word will be matched
* by aFirstFont. If this assumption is false we fix up the cache later in
* FinishTextRun. We make this assumption for two reasons:
* 1) it's usually true so it saves an extra cache lookup if we had to insert
* the entry later
* 2) we need to record words that appear in the string in some kind
* of hash table so we can detect and use them if they appear later in the
* (in general the string might be huge and contain many repeated words).
* We might as well use the master hash table for this.
*
* @return true if the word was found in the cache, false otherwise.
*/
PRBool
TextRunWordCache::LookupWord(gfxTextRun *aTextRun, gfxFont *aFirstFont,
PRUint32 aStart, PRUint32 aEnd, PRUint32 aHash,
nsTArray<DeferredWord>* aDeferredWords)
{
if (aEnd <= aStart)
return PR_TRUE;
gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
PRBool useFontGroup = (fontGroup->GetUserFontSet() != nsnull);
CacheHashKey key(aTextRun, (useFontGroup ? (void*)fontGroup : (void*)aFirstFont), aStart, aEnd - aStart, aHash);
CacheHashEntry *fontEntry = mCache.PutEntry(key);
if (!fontEntry)
return PR_FALSE;
CacheHashEntry *existingEntry = nsnull;
if (fontEntry->mTextRun) {
existingEntry = fontEntry;
} else if (useFontGroup) {
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): added using font group", aTextRun, aStart, aEnd - aStart, aHash));
} else {
// test to see if this can be found using the font group instead
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): added using font", aTextRun, aStart, aEnd - aStart, aHash));
key.mFontOrGroup = aTextRun->GetFontGroup();
CacheHashEntry *groupEntry = mCache.GetEntry(key);
if (groupEntry) {
existingEntry = groupEntry;
mCache.RawRemoveEntry(fontEntry);
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): removed using font", aTextRun, aStart, aEnd - aStart, aHash));
fontEntry = nsnull;
}
}
// At this point, either existingEntry is non-null and points to (surprise!)
// an entry for a word in an existing textrun, or fontEntry points
// to a cache entry for this word with aFirstFont, which needs to be
// filled in or removed.
if (existingEntry) {
if (aDeferredWords) {
DeferredWord word = { existingEntry->mTextRun,
existingEntry->mWordOffset, aStart, aEnd - aStart, aHash };
aDeferredWords->AppendElement(word);
} else {
aTextRun->CopyGlyphDataFrom(existingEntry->mTextRun,
existingEntry->mWordOffset, aEnd - aStart, aStart, PR_FALSE);
}
return PR_TRUE;
}
#ifdef DEBUG
++aTextRun->mCachedWords;
#endif
// Set up the cache entry so that if later in this textrun we hit this
// entry, we'll copy within our own textrun
fontEntry->mTextRun = aTextRun;
fontEntry->mWordOffset = aStart;
if (!useFontGroup)
fontEntry->mHashedByFont = PR_TRUE;
return PR_FALSE;
}
/**
* Processes all deferred words. Each word is copied from the source
* textrun to the output textrun. (The source may be an earlier word in the
* output textrun.) If the word was not matched by the textrun's fontgroup's
* first font, then we remove the entry we optimistically added to the cache
* with that font in the key, and add a new entry keyed with the fontgroup
* instead.
*
* @param aSuccessful if false, then we don't do any word copies and we don't
* add anything to the cache, but we still remove all the optimistic cache
* entries.
*/
void
TextRunWordCache::FinishTextRun(gfxTextRun *aTextRun, gfxTextRun *aNewRun,
const gfxFontGroup::Parameters *aParams,
const nsTArray<DeferredWord>& aDeferredWords,
PRBool aSuccessful)
{
aTextRun->SetFlagBits(gfxTextRunWordCache::TEXT_IN_CACHE);
PRUint32 i;
gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
gfxFont *font = fontGroup->GetFontAt(0);
// need to use the font group when user font set is around, since
// the first font may change as the result of a font download
PRBool useFontGroup = (fontGroup->GetUserFontSet() != nsnull);
// copy deferred words from various sources into destination textrun
for (i = 0; i < aDeferredWords.Length(); ++i) {
const DeferredWord *word = &aDeferredWords[i];
gfxTextRun *source = word->mSourceTextRun;
if (!source) {
source = aNewRun;
}
// If the word starts inside a cluster we don't want this word
// in the cache, so we'll remove the associated cache entry
PRBool wordStartsInsideCluster;
PRBool wordStartsInsideLigature;
if (aSuccessful) {
wordStartsInsideCluster =
!source->IsClusterStart(word->mSourceOffset);
wordStartsInsideLigature =
!source->IsLigatureGroupStart(word->mSourceOffset);
}
if (source == aNewRun) {
// We created a cache entry for this word based on the assumption
// that the word matches GetFontAt(0). If this assumption is false,
// we need to remove that cache entry and replace it with an entry
// keyed off the fontgroup.
PRBool removeFontKey = !aSuccessful ||
wordStartsInsideCluster || wordStartsInsideLigature ||
(!useFontGroup && font != GetWordFontOrGroup(aNewRun,
word->mSourceOffset,
word->mLength));
if (removeFontKey) {
// We need to remove the current placeholder cache entry
CacheHashKey key(aTextRun,
(useFontGroup ? (void*)fontGroup : (void*)font),
word->mDestOffset, word->mLength, word->mHash);
NS_ASSERTION(mCache.GetEntry(key),
"This entry should have been added previously!");
mCache.RemoveEntry(key);
#ifdef DEBUG
--aTextRun->mCachedWords;
#endif
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): removed using font", aTextRun, word->mDestOffset, word->mLength, word->mHash));
if (aSuccessful && !wordStartsInsideCluster && !wordStartsInsideLigature) {
key.mFontOrGroup = fontGroup;
CacheHashEntry *groupEntry = mCache.PutEntry(key);
if (groupEntry) {
#ifdef DEBUG
++aTextRun->mCachedWords;
#endif
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): added using fontgroup", aTextRun, word->mDestOffset, word->mLength, word->mHash));
groupEntry->mTextRun = aTextRun;
groupEntry->mWordOffset = word->mDestOffset;
groupEntry->mHashedByFont = PR_FALSE;
NS_ASSERTION(mCache.GetEntry(key),
"We should find the thing we just added!");
}
}
}
}
if (aSuccessful) {
// Copy the word. If the source is aNewRun, then
// allow CopyGlyphDataFrom to steal the internal data of
// aNewRun since that's only temporary anyway.
PRUint32 sourceOffset = word->mSourceOffset;
PRUint32 destOffset = word->mDestOffset;
PRUint32 length = word->mLength;
nsAutoPtr<gfxTextRun> tmpTextRun;
PRBool stealData = source == aNewRun;
if (wordStartsInsideCluster || wordStartsInsideLigature) {
NS_ASSERTION(sourceOffset > 0, "How can the first character be inside a cluster?");
if (wordStartsInsideCluster && destOffset > 0 &&
IsBoundarySpace(aTextRun->GetChar(destOffset - 1))) {
// The first character of the word formed a cluster
// with the preceding space.
// We should copy over data for the preceding space
// as well. The glyphs have probably been attached
// to that character.
--sourceOffset;
--destOffset;
++length;
} else {
// URK! This case sucks! We have combining marks or
// part of a ligature at the start of the text. We
// had to prepend a space just so we could detect this
// situation (so we can keep this "word" out of the
// cache). But now the data in aNewRun is no use to us.
// We need to find out what the platform would do
// if the characters were at the start of the text.
tmpTextRun = aNewRun->GetFontGroup()->MakeTextRun(
source->GetTextUnicode() + sourceOffset, length, aParams,
aNewRun->GetFlags());
if (tmpTextRun) {
source = tmpTextRun;
sourceOffset = 0;
stealData = PR_TRUE;
} else {
// If we failed to create the temporary run (OOM),
// skip the word, as if aSuccessful had been FALSE.
// (In practice this is only likely to occur if
// we're on the verge of an OOM crash anyhow.
// But ignoring gfxFontGroup::MakeTextRun() failure
// is bad because it means we'd be using an invalid
// source pointer.)
continue;
}
}
}
aTextRun->CopyGlyphDataFrom(source, sourceOffset, length,
destOffset, stealData);
// Fill in additional spaces
PRUint32 endCharIndex;
if (i + 1 < aDeferredWords.Length()) {
endCharIndex = aDeferredWords[i + 1].mDestOffset;
} else {
endCharIndex = aTextRun->GetLength();
}
PRUint32 charIndex;
for (charIndex = word->mDestOffset + word->mLength;
charIndex < endCharIndex; ++charIndex) {
if (IsBoundarySpace(aTextRun->GetChar(charIndex))) {
aTextRun->SetSpaceGlyph(font, aParams->mContext, charIndex);
}
}
}
}
}
static gfxTextRun *
MakeBlankTextRun(const void* aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags)
{
nsAutoPtr<gfxTextRun> textRun;
textRun = gfxTextRun::Create(aParams, aText, aLength, aFontGroup, aFlags);
if (!textRun || !textRun->GetCharacterGlyphs())
return nsnull;
gfxFont *font = aFontGroup->GetFontAt(0);
textRun->AddGlyphRun(font, 0);
#ifdef DEBUG
textRun->mCachedWords = 0;
textRun->mCacheGeneration = gTextRunWordCache ? gTextRunWordCache->mGeneration : 0;
#endif
return textRun.forget();
}
gfxTextRun *
TextRunWordCache::MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags)
{
// update font list when using user fonts (assures generation is current)
aFontGroup->UpdateFontList();
if (aFontGroup->GetStyle()->size == 0) {
// Short-circuit for size-0 fonts, as Windows and ATSUI can't handle
// them, and always create at least size 1 fonts, i.e. they still
// render something for size 0 fonts.
return MakeBlankTextRun(aText, aLength, aFontGroup, aParams, aFlags);
}
nsAutoPtr<gfxTextRun> textRun;
textRun = gfxTextRun::Create(aParams, aText, aLength, aFontGroup, aFlags);
if (!textRun || !textRun->GetCharacterGlyphs())
return nsnull;
#ifdef DEBUG
textRun->mCachedWords = 0;
textRun->mCacheGeneration = mGeneration;
#endif
gfxFont *font = aFontGroup->GetFontAt(0);
nsresult rv = textRun->AddGlyphRun(font, 0);
NS_ENSURE_SUCCESS(rv, nsnull);
nsAutoTArray<PRUnichar,200> tempString;
nsAutoTArray<DeferredWord,50> deferredWords;
nsAutoTArray<nsAutoPtr<gfxTextRun>,10> transientRuns;
PRUint32 i;
PRUint32 wordStart = 0;
PRUint32 hash = 0;
PRBool seenDigitToModify = PR_FALSE;
PRBool needsNumeralProcessing =
mBidiNumeral != IBMBIDI_NUMERAL_NOMINAL;
for (i = 0; i <= aLength; ++i) {
PRUnichar ch = i < aLength ? aText[i] : ' ';
if (!seenDigitToModify && needsNumeralProcessing) {
// check if there is a digit that needs to be transformed
if (HandleNumberInChar(ch, !!(i > 0 ?
IS_ARABIC_CHAR(aText[i-1]) :
(aFlags & gfxTextRunWordCache::TEXT_INCOMING_ARABICCHAR)),
mBidiNumeral) != ch)
seenDigitToModify = PR_TRUE;
}
if (IsWordBoundary(ch)) {
if (seenDigitToModify) {
// the word included at least one digit that is modified by the current
// bidi.numerals setting, so we must not use the cache for this word;
// instead, we'll create a new textRun and a DeferredWord entry pointing to it
PRUint32 length = i - wordStart;
nsAutoArrayPtr<PRUnichar> numString;
numString = new PRUnichar[length];
for (PRUint32 j = 0; j < length; ++j) {
numString[j] = HandleNumberInChar(aText[wordStart+j],
!!(j > 0 ?
IS_ARABIC_CHAR(numString[j-1]) :
(aFlags & gfxTextRunWordCache::TEXT_INCOMING_ARABICCHAR)),
mBidiNumeral);
}
// now we make a transient textRun for the transformed word; this will not be cached
gfxTextRun *numRun;
numRun =
aFontGroup->MakeTextRun(numString.get(), length, aParams,
aFlags & ~(gfxTextRunFactory::TEXT_IS_PERSISTENT |
gfxTextRunFactory::TEXT_IS_8BIT));
// If MakeTextRun failed, numRun will be null, which is bad...
// we'll just pretend there wasn't a digit to process.
// This means we won't have the correct numerals, but at least
// we're not trying to copy glyph data from an invalid source.
// In practice it's unlikely to happen unless we're very close
// to crashing due to OOM.
if (numRun) {
DeferredWord word = { numRun, 0, wordStart, length, hash };
deferredWords.AppendElement(word);
transientRuns.AppendElement(numRun);
} else {
seenDigitToModify = PR_FALSE;
}
}
if (!seenDigitToModify) {
// didn't need to modify digits (or failed to do so)
PRBool hit = LookupWord(textRun, font, wordStart, i, hash,
deferredWords.Length() == 0 ? nsnull : &deferredWords);
if (!hit) {
// Always put a space before the word so we can detect
// combining characters at the start of a word
tempString.AppendElement(' ');
PRUint32 offset = tempString.Length();
PRUint32 length = i - wordStart;
PRUnichar *chars = tempString.AppendElements(length);
if (!chars) {
FinishTextRun(textRun, nsnull, nsnull, deferredWords, PR_FALSE);
return nsnull;
}
memcpy(chars, aText + wordStart, length*sizeof(PRUnichar));
DeferredWord word = { nsnull, offset, wordStart, length, hash };
deferredWords.AppendElement(word);
}
if (deferredWords.Length() == 0) {
if (IsBoundarySpace(ch) && i < aLength) {
textRun->SetSpaceGlyph(font, aParams->mContext, i);
} // else we should set this character to be invisible missing,
// but it already is because the textrun is blank!
}
} else {
seenDigitToModify = PR_FALSE;
}
hash = 0;
wordStart = i + 1;
} else {
hash = HashMix(hash, ch);
}
}
if (deferredWords.Length() == 0) {
// We got everything from the cache, so we're done. No point in calling
// FinishTextRun.
// This textrun is not referenced by the cache.
return textRun.forget();
}
// create textrun for unknown words
gfxTextRunFactory::Parameters params =
{ aParams->mContext, nsnull, nsnull, nsnull, 0, aParams->mAppUnitsPerDevUnit };
nsAutoPtr<gfxTextRun> newRun;
if (tempString.Length() == 0) {
newRun = aFontGroup->MakeEmptyTextRun(&params, aFlags);
} else {
newRun = aFontGroup->MakeTextRun(tempString.Elements(), tempString.Length(),
&params, aFlags | gfxTextRunFactory::TEXT_IS_PERSISTENT);
}
FinishTextRun(textRun, newRun, aParams, deferredWords, newRun != nsnull);
return textRun.forget();
}
gfxTextRun *
TextRunWordCache::MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags)
{
// update font list when using user fonts (assures generation is current)
aFontGroup->UpdateFontList();
if (aFontGroup->GetStyle()->size == 0) {
// Short-circuit for size-0 fonts, as Windows and ATSUI can't handle
// them, and always create at least size 1 fonts, i.e. they still
// render something for size 0 fonts.
return MakeBlankTextRun(aText, aLength, aFontGroup, aParams, aFlags);
}
aFlags |= gfxTextRunFactory::TEXT_IS_8BIT;
nsAutoPtr<gfxTextRun> textRun;
textRun = gfxTextRun::Create(aParams, aText, aLength, aFontGroup, aFlags);
if (!textRun || !textRun->GetCharacterGlyphs())
return nsnull;
#ifdef DEBUG
textRun->mCachedWords = 0;
textRun->mCacheGeneration = mGeneration;
#endif
gfxFont *font = aFontGroup->GetFontAt(0);
nsresult rv = textRun->AddGlyphRun(font, 0);
NS_ENSURE_SUCCESS(rv, nsnull);
nsAutoTArray<PRUint8,200> tempString;
nsAutoTArray<DeferredWord,50> deferredWords;
nsAutoTArray<nsAutoPtr<gfxTextRun>,10> transientRuns;
PRUint32 i;
PRUint32 wordStart = 0;
PRUint32 hash = 0;
PRBool seenDigitToModify = PR_FALSE;
PRBool needsNumeralProcessing =
mBidiNumeral != IBMBIDI_NUMERAL_NOMINAL;
for (i = 0; i <= aLength; ++i) {
PRUint8 ch = i < aLength ? aText[i] : ' ';
if (!seenDigitToModify && needsNumeralProcessing) {
// check if there is a digit that needs to be transformed
if (HandleNumberInChar(ch, i == 0 && (aFlags & gfxTextRunWordCache::TEXT_INCOMING_ARABICCHAR),
mBidiNumeral) != ch)
seenDigitToModify = PR_TRUE;
}
if (IsWordBoundary(ch)) {
if (seenDigitToModify) {
// see parallel code in the 16-bit method above
PRUint32 length = i - wordStart;
nsAutoArrayPtr<PRUnichar> numString;
numString = new PRUnichar[length];
for (PRUint32 j = 0; j < length; ++j) {
numString[j] = HandleNumberInChar(aText[wordStart+j],
!!(j > 0 ?
IS_ARABIC_CHAR(numString[j-1]) :
(aFlags & gfxTextRunWordCache::TEXT_INCOMING_ARABICCHAR)),
mBidiNumeral);
}
// now we make a transient textRun for the transformed word; this will not be cached
gfxTextRun *numRun;
numRun =
aFontGroup->MakeTextRun(numString.get(), length, aParams,
aFlags & ~(gfxTextRunFactory::TEXT_IS_PERSISTENT |
gfxTextRunFactory::TEXT_IS_8BIT));
if (numRun) {
DeferredWord word = { numRun, 0, wordStart, length, hash };
deferredWords.AppendElement(word);
transientRuns.AppendElement(numRun);
} else {
seenDigitToModify = PR_FALSE;
}
}
if (!seenDigitToModify) {
PRBool hit = LookupWord(textRun, font, wordStart, i, hash,
deferredWords.Length() == 0 ? nsnull : &deferredWords);
if (!hit) {
if (tempString.Length() > 0) {
tempString.AppendElement(' ');
}
PRUint32 offset = tempString.Length();
PRUint32 length = i - wordStart;
PRUint8 *chars = tempString.AppendElements(length);
if (!chars) {
FinishTextRun(textRun, nsnull, nsnull, deferredWords, PR_FALSE);
return nsnull;
}
memcpy(chars, aText + wordStart, length*sizeof(PRUint8));
DeferredWord word = { nsnull, offset, wordStart, length, hash };
deferredWords.AppendElement(word);
}
if (deferredWords.Length() == 0) {
if (IsBoundarySpace(ch) && i < aLength) {
textRun->SetSpaceGlyph(font, aParams->mContext, i);
} // else we should set this character to be invisible missing,
// but it already is because the textrun is blank!
}
} else {
seenDigitToModify = PR_FALSE;
}
hash = 0;
wordStart = i + 1;
} else {
hash = HashMix(hash, ch);
}
}
if (deferredWords.Length() == 0) {
// We got everything from the cache, so we're done. No point in calling
// FinishTextRun.
// This textrun is not referenced by the cache.
return textRun.forget();
}
// create textrun for unknown words
gfxTextRunFactory::Parameters params =
{ aParams->mContext, nsnull, nsnull, nsnull, 0, aParams->mAppUnitsPerDevUnit };
nsAutoPtr<gfxTextRun> newRun;
if (tempString.Length() == 0) {
newRun = aFontGroup->MakeEmptyTextRun(&params, aFlags);
} else {
newRun = aFontGroup->MakeTextRun(tempString.Elements(), tempString.Length(),
&params, aFlags | gfxTextRunFactory::TEXT_IS_PERSISTENT);
}
FinishTextRun(textRun, newRun, aParams, deferredWords, newRun != nsnull);
return textRun.forget();
}
void
TextRunWordCache::RemoveWord(gfxTextRun *aTextRun, PRUint32 aStart,
PRUint32 aEnd, PRUint32 aHash)
{
if (aEnd <= aStart)
return;
PRUint32 length = aEnd - aStart;
CacheHashKey key(aTextRun, GetWordFontOrGroup(aTextRun, aStart, length),
aStart, length, aHash);
CacheHashEntry *entry = mCache.GetEntry(key);
if (entry && entry->mTextRun == aTextRun) {
// XXX would like to use RawRemoveEntry here plus some extra method
// that conditionally shrinks the hashtable
mCache.RemoveEntry(key);
#ifdef DEBUG
--aTextRun->mCachedWords;
#endif
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): removed using %s",
aTextRun, aStart, length, aHash,
key.mFontOrGroup == aTextRun->GetFontGroup() ? "fontgroup" : "font"));
}
}
// Remove a textrun from the cache by looking up each word and removing it
void
TextRunWordCache::RemoveTextRun(gfxTextRun *aTextRun)
{
#ifdef DEBUG
if (aTextRun->mCacheGeneration != mGeneration) {
PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("cache generation changed (aTextRun %p)", aTextRun));
return;
}
#endif
PRUint32 i;
PRUint32 wordStart = 0;
PRUint32 hash = 0;
for (i = 0; i < aTextRun->GetLength(); ++i) {
PRUnichar ch = aTextRun->GetChar(i);
if (IsWordBoundary(ch)) {
RemoveWord(aTextRun, wordStart, i, hash);
hash = 0;
wordStart = i + 1;
} else {
hash = HashMix(hash, ch);
}
}
RemoveWord(aTextRun, wordStart, i, hash);
#ifdef DEBUG
NS_ASSERTION(aTextRun->mCachedWords == 0,
"Textrun was not completely removed from the cache!");
#endif
}
static PRBool
CompareDifferentWidthStrings(const PRUint8 *aStr1, const PRUnichar *aStr2,
PRUint32 aLength)
{
PRUint32 i;
for (i = 0; i < aLength; ++i) {
if (aStr1[i] != aStr2[i])
return PR_FALSE;
}
return PR_TRUE;
}
static PRBool
IsWordEnd(gfxTextRun *aTextRun, PRUint32 aOffset)
{
PRUint32 runLength = aTextRun->GetLength();
if (aOffset == runLength)
return PR_TRUE;
if (aOffset > runLength)
return PR_FALSE;
return IsWordBoundary(aTextRun->GetChar(aOffset));
}
static void *
GetFontOrGroup(gfxFontGroup *aFontGroup, PRBool aUseFont)
{
return aUseFont
? static_cast<void *>(aFontGroup->GetFontAt(0))
: static_cast<void *>(aFontGroup);
}
PRBool
TextRunWordCache::CacheHashEntry::KeyEquals(const KeyTypePointer aKey) const
{
if (!mTextRun)
return PR_FALSE;
PRUint32 length = aKey->mLength;
gfxFontGroup *fontGroup = mTextRun->GetFontGroup();
if (!IsWordEnd(mTextRun, mWordOffset + length) ||
GetFontOrGroup(fontGroup, mHashedByFont) != aKey->mFontOrGroup ||
aKey->mAppUnitsPerDevUnit != mTextRun->GetAppUnitsPerDevUnit() ||
aKey->mIsRTL != mTextRun->IsRightToLeft() ||
aKey->mEnabledOptionalLigatures != ((mTextRun->GetFlags() & gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES) == 0) ||
aKey->mOptimizeSpeed != ((mTextRun->GetFlags() & gfxTextRunFactory::TEXT_OPTIMIZE_SPEED) != 0) ||
aKey->mUserFontSetGeneration != (mTextRun->GetUserFontSetGeneration()))
return PR_FALSE;
if (mTextRun->GetFlags() & gfxFontGroup::TEXT_IS_8BIT) {
const PRUint8 *text = mTextRun->GetText8Bit() + mWordOffset;
if (!aKey->mIsDoubleByteText)
return memcmp(text, aKey->mString, length) == 0;
return CompareDifferentWidthStrings(text,
static_cast<const PRUnichar *>(aKey->mString), length);
} else {
const PRUnichar *text = mTextRun->GetTextUnicode() + mWordOffset;
if (aKey->mIsDoubleByteText)
return memcmp(text, aKey->mString, length*sizeof(PRUnichar)) == 0;
return CompareDifferentWidthStrings(static_cast<const PRUint8 *>(aKey->mString),
text, length);
}
}
PLDHashNumber
TextRunWordCache::CacheHashEntry::HashKey(const KeyTypePointer aKey)
{
// only use lower 32 bits of generation counter in hash key,
// since these vary the most
PRUint32 fontSetGen;
LL_L2UI(fontSetGen, aKey->mUserFontSetGeneration);
return aKey->mStringHash + fontSetGen + (PRUint32)(intptr_t)aKey->mFontOrGroup + aKey->mAppUnitsPerDevUnit +
aKey->mIsDoubleByteText + aKey->mIsRTL*2 + aKey->mEnabledOptionalLigatures*4 +
aKey->mOptimizeSpeed*8;
}
#ifdef DEBUG
PLDHashOperator
TextRunWordCache::CacheDumpEntry(CacheHashEntry* aEntry, void* userArg)
{
FILE* output = static_cast<FILE*>(userArg);
if (!aEntry->mTextRun) {
fprintf(output, "<EMPTY>\n");
return PL_DHASH_NEXT;
}
fprintf(output, "Word at %p:%d => ", static_cast<void*>(aEntry->mTextRun), aEntry->mWordOffset);
aEntry->mTextRun->Dump(output);
fprintf(output, " (hashed by %s)\n", aEntry->mHashedByFont ? "font" : "fontgroup");
return PL_DHASH_NEXT;
}
void
TextRunWordCache::Dump()
{
mCache.EnumerateEntries(CacheDumpEntry, stdout);
}
#endif
nsresult
gfxTextRunWordCache::Init()
{
gTextRunWordCache = new TextRunWordCache();
if (gTextRunWordCache) {
// ensure there is a reference before the AddObserver calls;
// this will be Release()'d in gfxTextRunWordCache::Shutdown()
NS_ADDREF(gTextRunWordCache);
gTextRunWordCache->Init();
}
return gTextRunWordCache ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
void
gfxTextRunWordCache::Shutdown()
{
NS_IF_RELEASE(gTextRunWordCache);
}
gfxTextRun *
gfxTextRunWordCache::MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags)
{
if (!gTextRunWordCache)
return nsnull;
return gTextRunWordCache->MakeTextRun(aText, aLength, aFontGroup, aParams, aFlags);
}
gfxTextRun *
gfxTextRunWordCache::MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags)
{
if (!gTextRunWordCache)
return nsnull;
return gTextRunWordCache->MakeTextRun(aText, aLength, aFontGroup, aParams, aFlags);
}
void
gfxTextRunWordCache::RemoveTextRun(gfxTextRun *aTextRun)
{
if (!gTextRunWordCache)
return;
gTextRunWordCache->RemoveTextRun(aTextRun);
}
void
gfxTextRunWordCache::Flush()
{
if (!gTextRunWordCache)
return;
gTextRunWordCache->Flush();
}
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