зеркало из https://github.com/mozilla/pjs.git
1064 строки
42 KiB
C++
1064 строки
42 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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* Ehsan Akhgari <ehsan.akhgari@gmail.com>
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* Jonathan Kew <jfkthame@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "gfxTextRunWordCache.h"
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#include "nsWeakReference.h"
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#include "nsCRT.h"
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#include "nsIObserver.h"
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#include "nsBidiUtils.h"
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#include "mozilla/Preferences.h"
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#if defined(XP_UNIX)
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#include <stdint.h>
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#endif
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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using namespace mozilla;
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/**
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* Cache individual "words" (strings delimited by white-space or white-space-like
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* characters that don't involve kerning or ligatures) in textruns.
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*
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* The characters treated as word boundaries are defined by IsWordBoundary
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* below. The characters are: space, NBSP, and all the characters
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* defined by gfxFontGroup::IsInvalidChar. The latter are all converted
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* to invisible missing glyphs in this code. Thus, this class ensures
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* that none of those invalid characters are ever passed to platform
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* textrun implementations.
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*
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* Some platforms support marks combining with spaces to form clusters.
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* In such cases we treat "before the space" as a word boundary but
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* "after the space" is not a word boundary; words with a leading space
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* are kept out of the cache. Also, words at the start of text, which start
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* with combining marks that would combine with a space if there was one,
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* are also kept out of the cache.
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*/
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class TextRunWordCache :
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public nsIObserver,
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public nsSupportsWeakReference {
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public:
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TextRunWordCache() :
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mBidiNumeral(0) {
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mCache.Init(100);
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}
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~TextRunWordCache() {
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Uninit();
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NS_WARN_IF_FALSE(mCache.Count() == 0, "Textrun cache not empty!");
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}
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void Init();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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/**
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* Create a textrun using cached words.
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* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
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* treated as invisible missing.
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* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
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* if applicable
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* @param aIsInCache if true is returned, then RemoveTextRun must be called
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* before the textrun changes or dies.
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*/
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gfxTextRun *MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
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gfxFontGroup *aFontGroup,
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const gfxFontGroup::Parameters *aParams,
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PRUint32 aFlags);
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/**
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* Create a textrun using cached words.
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* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
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* treated as invisible missing.
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* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
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* if applicable
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* @param aIsInCache if true is returned, then RemoveTextRun must be called
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* before the textrun changes or dies.
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*/
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gfxTextRun *MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
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gfxFontGroup *aFontGroup,
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const gfxFontGroup::Parameters *aParams,
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PRUint32 aFlags);
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/**
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* Remove a textrun from the cache. This must be called before aTextRun
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* is deleted! The text in the textrun must still be valid.
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*/
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void RemoveTextRun(gfxTextRun *aTextRun);
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/**
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* Flush all cached runs. Use when a setting change makes them obsolete.
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*/
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void Flush() {
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mCache.Clear();
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#ifdef DEBUG
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mGeneration++;
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#endif
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}
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#ifdef DEBUG
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PRUint32 mGeneration;
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void Dump();
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#endif
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protected:
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struct CacheHashKey {
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void *mFontOrGroup;
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const void *mString;
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PRUint32 mLength;
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PRUint32 mAppUnitsPerDevUnit;
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PRUint32 mStringHash;
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PRUint64 mUserFontSetGeneration;
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PRPackedBool mIsDoubleByteText;
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PRPackedBool mIsRTL;
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PRPackedBool mEnabledOptionalLigatures;
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PRPackedBool mOptimizeSpeed;
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CacheHashKey(gfxTextRun *aBaseTextRun, void *aFontOrGroup,
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PRUint32 aStart, PRUint32 aLength, PRUint32 aHash)
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: mFontOrGroup(aFontOrGroup), mString(aBaseTextRun->GetTextAt(aStart)),
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mLength(aLength),
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mAppUnitsPerDevUnit(aBaseTextRun->GetAppUnitsPerDevUnit()),
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mStringHash(aHash),
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mUserFontSetGeneration(aBaseTextRun->GetUserFontSetGeneration()),
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mIsDoubleByteText((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) == 0),
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mIsRTL(aBaseTextRun->IsRightToLeft()),
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mEnabledOptionalLigatures((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES) == 0),
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mOptimizeSpeed((aBaseTextRun->GetFlags() & gfxTextRunFactory::TEXT_OPTIMIZE_SPEED) != 0)
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{
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}
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};
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class CacheHashEntry : public PLDHashEntryHdr {
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public:
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typedef const CacheHashKey &KeyType;
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typedef const CacheHashKey *KeyTypePointer;
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// When constructing a new entry in the hashtable, the caller of Put()
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// will fill us in.
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CacheHashEntry(KeyTypePointer aKey) : mTextRun(nsnull), mWordOffset(0),
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mHashedByFont(PR_FALSE) { }
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CacheHashEntry(const CacheHashEntry& toCopy) { NS_ERROR("Should not be called"); }
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~CacheHashEntry() { }
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PRBool KeyEquals(const KeyTypePointer aKey) const;
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey);
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enum { ALLOW_MEMMOVE = PR_TRUE };
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gfxTextRun *mTextRun;
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// The offset of the start of the word in the textrun. The length of
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// the word is not stored here because we can figure it out by
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// looking at the textrun's text.
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PRUint32 mWordOffset:31;
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// This is set to true when the cache entry was hashed by the first
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// font in mTextRun's fontgroup; it's false when the cache entry
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// was hashed by the fontgroup itself.
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PRUint32 mHashedByFont:1;
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};
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// Used to track words that should be copied from one textrun to
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// another during the textrun construction process
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struct DeferredWord {
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gfxTextRun *mSourceTextRun;
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PRUint32 mSourceOffset;
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PRUint32 mDestOffset;
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PRUint32 mLength;
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PRUint32 mHash;
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};
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PRBool LookupWord(gfxTextRun *aTextRun, gfxFont *aFirstFont,
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PRUint32 aStart, PRUint32 aEnd, PRUint32 aHash,
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nsTArray<DeferredWord>* aDeferredWords);
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void FinishTextRun(gfxTextRun *aTextRun, gfxTextRun *aNewRun,
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const gfxFontGroup::Parameters *aParams,
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const nsTArray<DeferredWord>& aDeferredWords,
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PRBool aSuccessful);
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void RemoveWord(gfxTextRun *aTextRun, PRUint32 aStart,
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PRUint32 aEnd, PRUint32 aHash);
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void Uninit();
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nsTHashtable<CacheHashEntry> mCache;
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PRInt32 mBidiNumeral;
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#ifdef DEBUG
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static PLDHashOperator CacheDumpEntry(CacheHashEntry* aEntry, void* userArg);
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#endif
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};
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NS_IMPL_ISUPPORTS2(TextRunWordCache, nsIObserver, nsISupportsWeakReference)
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static TextRunWordCache *gTextRunWordCache = nsnull;
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static PRLogModuleInfo *gWordCacheLog = PR_NewLogModule("wordCache");
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static const char* kObservedPrefs[] = {
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"bidi.",
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"font.",
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nsnull
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};
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void
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TextRunWordCache::Init()
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{
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#ifdef DEBUG
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mGeneration = 0;
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#endif
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Preferences::AddWeakObservers(this, kObservedPrefs);
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mBidiNumeral = Preferences::GetInt("bidi.numeral", mBidiNumeral);
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}
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void
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TextRunWordCache::Uninit()
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{
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Preferences::RemoveObservers(this, kObservedPrefs);
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}
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NS_IMETHODIMP
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TextRunWordCache::Observe(nsISupports *aSubject,
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const char *aTopic,
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const PRUnichar *aData)
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{
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if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
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if (!nsCRT::strcmp(aData, NS_LITERAL_STRING("bidi.numeral").get())) {
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mBidiNumeral = Preferences::GetInt("bidi.numeral", mBidiNumeral);
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}
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mCache.Clear();
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PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("flushing the textrun cache"));
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#ifdef DEBUG
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mGeneration++;
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#endif
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}
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return NS_OK;
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}
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static inline PRUint32
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HashMix(PRUint32 aHash, PRUnichar aCh)
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{
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return (aHash >> 28) ^ (aHash << 4) ^ aCh;
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}
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// If the substring of the textrun is rendered entirely in the first font
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// of the textrun's fontgroup, then return that font. Otherwise return the
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// fontgroup. When a user font set is in use, always return the font group.
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static void *GetWordFontOrGroup(gfxTextRun *aTextRun, PRUint32 aOffset,
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PRUint32 aLength)
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{
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gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
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if (fontGroup->GetUserFontSet() != nsnull)
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return fontGroup;
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PRUint32 glyphRunCount;
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const gfxTextRun::GlyphRun *glyphRuns = aTextRun->GetGlyphRuns(&glyphRunCount);
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PRUint32 glyphRunIndex = aTextRun->FindFirstGlyphRunContaining(aOffset);
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gfxFont *firstFont = fontGroup->GetFontAt(0);
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if (glyphRuns[glyphRunIndex].mFont != firstFont)
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return fontGroup;
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PRUint32 glyphRunEnd = glyphRunIndex == glyphRunCount - 1
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? aTextRun->GetLength() : glyphRuns[glyphRunIndex + 1].mCharacterOffset;
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if (aOffset + aLength <= glyphRunEnd)
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return firstFont;
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return fontGroup;
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}
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#define UNICODE_NBSP 0x00A0
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// XXX should we treat NBSP or SPACE combined with other characters as a word
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// boundary? Currently this does.
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static PRBool
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IsBoundarySpace(PRUnichar aChar)
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{
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return aChar == ' ' || aChar == UNICODE_NBSP;
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}
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static PRBool
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IsWordBoundary(PRUnichar aChar)
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{
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return IsBoundarySpace(aChar) || gfxFontGroup::IsInvalidChar(aChar);
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}
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/**
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* Looks up a word in the cache. If the word is found in the cache
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* (which could be from an existing textrun or an earlier word in the same
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* textrun), we copy the glyphs from the word into the textrun, unless
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* aDeferredWords is non-null (meaning that all words from now on must be
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* copied later instead of now), in which case we add the word to be copied
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* to the list.
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*
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* If the word is not found in the cache then we add it to the cache with
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* aFirstFont as the key, on the assumption that the word will be matched
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* by aFirstFont. If this assumption is false we fix up the cache later in
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* FinishTextRun. We make this assumption for two reasons:
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* 1) it's usually true so it saves an extra cache lookup if we had to insert
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* the entry later
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* 2) we need to record words that appear in the string in some kind
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* of hash table so we can detect and use them if they appear later in the
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* (in general the string might be huge and contain many repeated words).
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* We might as well use the master hash table for this.
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*
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* @return true if the word was found in the cache, false otherwise.
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*/
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PRBool
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TextRunWordCache::LookupWord(gfxTextRun *aTextRun, gfxFont *aFirstFont,
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PRUint32 aStart, PRUint32 aEnd, PRUint32 aHash,
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nsTArray<DeferredWord>* aDeferredWords)
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{
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if (aEnd <= aStart)
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return PR_TRUE;
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gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
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PRBool useFontGroup = (fontGroup->GetUserFontSet() != nsnull);
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CacheHashKey key(aTextRun, (useFontGroup ? (void*)fontGroup : (void*)aFirstFont), aStart, aEnd - aStart, aHash);
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CacheHashEntry *fontEntry = mCache.PutEntry(key);
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if (!fontEntry)
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return PR_FALSE;
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CacheHashEntry *existingEntry = nsnull;
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if (fontEntry->mTextRun) {
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existingEntry = fontEntry;
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} else if (useFontGroup) {
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PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): added using font group", aTextRun, aStart, aEnd - aStart, aHash));
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} else {
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// test to see if this can be found using the font group instead
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PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): added using font", aTextRun, aStart, aEnd - aStart, aHash));
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key.mFontOrGroup = aTextRun->GetFontGroup();
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CacheHashEntry *groupEntry = mCache.GetEntry(key);
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if (groupEntry) {
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existingEntry = groupEntry;
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mCache.RawRemoveEntry(fontEntry);
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PR_LOG(gWordCacheLog, PR_LOG_DEBUG, ("%p(%d-%d,%d): removed using font", aTextRun, aStart, aEnd - aStart, aHash));
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fontEntry = nsnull;
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}
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}
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// At this point, either existingEntry is non-null and points to (surprise!)
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// an entry for a word in an existing textrun, or fontEntry points
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// to a cache entry for this word with aFirstFont, which needs to be
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// filled in or removed.
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if (existingEntry) {
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if (aDeferredWords) {
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DeferredWord word = { existingEntry->mTextRun,
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existingEntry->mWordOffset, aStart, aEnd - aStart, aHash };
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aDeferredWords->AppendElement(word);
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} else {
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aTextRun->CopyGlyphDataFrom(existingEntry->mTextRun,
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existingEntry->mWordOffset, aEnd - aStart, aStart);
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}
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return PR_TRUE;
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}
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#ifdef DEBUG
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++aTextRun->mCachedWords;
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#endif
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// Set up the cache entry so that if later in this textrun we hit this
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// entry, we'll copy within our own textrun
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fontEntry->mTextRun = aTextRun;
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fontEntry->mWordOffset = aStart;
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if (!useFontGroup)
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fontEntry->mHashedByFont = PR_TRUE;
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return PR_FALSE;
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}
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/**
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* Processes all deferred words. Each word is copied from the source
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* textrun to the output textrun. (The source may be an earlier word in the
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* output textrun.) If the word was not matched by the textrun's fontgroup's
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* first font, then we remove the entry we optimistically added to the cache
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* with that font in the key, and add a new entry keyed with the fontgroup
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* instead.
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*
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* @param aSuccessful if false, then we don't do any word copies and we don't
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* add anything to the cache, but we still remove all the optimistic cache
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* entries.
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*/
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void
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TextRunWordCache::FinishTextRun(gfxTextRun *aTextRun, gfxTextRun *aNewRun,
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const gfxFontGroup::Parameters *aParams,
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const nsTArray<DeferredWord>& aDeferredWords,
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PRBool aSuccessful)
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{
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aTextRun->SetFlagBits(gfxTextRunWordCache::TEXT_IN_CACHE);
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PRUint32 i;
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gfxFontGroup *fontGroup = aTextRun->GetFontGroup();
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gfxFont *font = fontGroup->GetFontAt(0);
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// need to use the font group when user font set is around, since
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// the first font may change as the result of a font download
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PRBool useFontGroup = (fontGroup->GetUserFontSet() != nsnull);
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// copy deferred words from various sources into destination textrun
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for (i = 0; i < aDeferredWords.Length(); ++i) {
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const DeferredWord *word = &aDeferredWords[i];
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gfxTextRun *source = word->mSourceTextRun;
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if (!source) {
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source = aNewRun;
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}
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// If the word starts inside a cluster we don't want this word
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// in the cache, so we'll remove the associated cache entry
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PRBool wordStartsInsideCluster;
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PRBool wordStartsInsideLigature;
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if (aSuccessful) {
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wordStartsInsideCluster =
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!source->IsClusterStart(word->mSourceOffset);
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wordStartsInsideLigature =
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!source->IsLigatureGroupStart(word->mSourceOffset);
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}
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if (source == aNewRun) {
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// We created a cache entry for this word based on the assumption
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// that the word matches GetFontAt(0). If this assumption is false,
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// we need to remove that cache entry and replace it with an entry
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// keyed off the fontgroup.
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PRBool removeFontKey = !aSuccessful ||
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wordStartsInsideCluster || wordStartsInsideLigature ||
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(!useFontGroup && font != GetWordFontOrGroup(aNewRun,
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word->mSourceOffset,
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word->mLength));
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if (removeFontKey) {
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// We need to remove the current placeholder cache entry
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CacheHashKey key(aTextRun,
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(useFontGroup ? (void*)fontGroup : (void*)font),
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word->mDestOffset, word->mLength, word->mHash);
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NS_ASSERTION(mCache.GetEntry(key),
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"This entry should have been added previously!");
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mCache.RemoveEntry(key);
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#ifdef DEBUG
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--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.
|
|
PRUint32 sourceOffset = word->mSourceOffset;
|
|
PRUint32 destOffset = word->mDestOffset;
|
|
PRUint32 length = word->mLength;
|
|
nsAutoPtr<gfxTextRun> tmpTextRun;
|
|
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.
|
|
if (source->GetFlags() & gfxFontGroup::TEXT_IS_8BIT) {
|
|
tmpTextRun = fontGroup->
|
|
MakeTextRun(source->GetText8Bit() + sourceOffset,
|
|
length, aParams, source->GetFlags());
|
|
} else {
|
|
tmpTextRun = fontGroup->
|
|
MakeTextRun(source->GetTextUnicode() + sourceOffset,
|
|
length, aParams, source->GetFlags());
|
|
}
|
|
if (tmpTextRun) {
|
|
source = tmpTextRun;
|
|
sourceOffset = 0;
|
|
} 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);
|
|
// 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, gfxTextRange::kFontGroup, 0, PR_FALSE);
|
|
#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, gfxTextRange::kFontGroup, 0, PR_FALSE);
|
|
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(¶ms, aFlags);
|
|
} else {
|
|
newRun = aFontGroup->MakeTextRun(tempString.Elements(), tempString.Length(),
|
|
¶ms, 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, gfxTextRange::kFontGroup, 0, PR_FALSE);
|
|
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(¶ms, aFlags);
|
|
} else {
|
|
newRun = aFontGroup->MakeTextRun(tempString.Elements(), tempString.Length(),
|
|
¶ms, 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();
|
|
}
|