--- a/graphicsdeviceinterface/gdi/inc/BIDI.H Thu Sep 02 21:50:40 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,210 +0,0 @@
-/*
-* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
-* All rights reserved.
-* This component and the accompanying materials are made available
-* under the terms of "Eclipse Public License v1.0"
-* which accompanies this distribution, and is available
-* at the URL "http://www.eclipse.org/legal/epl-v10.html".
-*
-* Initial Contributors:
-* Nokia Corporation - initial contribution.
-*
-* Contributors:
-*
-* Description:
-* Definitions for bidirectional text reordering.
-*
-*
-*/
-
-
-
-#ifndef BIDI_H_
-#define BIDI_H_
-
-#include <e32std.h>
-
-class RWriteStream;
-class RReadStream;
-
-
-class TBidirectionalState
-/**
-The bidirectional state class.
-This class contains functions that implement the Unicode Bidirectional Algorithm,
-which changes text from logical order to display order for the correct display
-of right-to-left scripts, like Arabic and Hebrew. A TBidirectionalState object
-carries the embedding level and stack from one line to the next. On construction
-it is in its 'start of paragraph' state.
-@publishedAll
-@released
-*/
- {
- friend class CTBiDi;
-
-public:
-
- class TRunInfo
- /**
- Information about a run of characters with the same bidirectional
- category.
-
- An array of these representing a line is passed into, and reordered by,
- ReorderLine().
- @publishedAll
- @released
- */
- {
- public:
- /** Category of a run of text: passed to ReorderLine(); these are
- passed in as TChar::TBdCategory values but are modified for internal
- use. */
- TUint iCategory;
- /** Embedding level of this run: used internally by ReorderLine(). */
- TUint8 iEmbeddingLevel;
- /** Resolved direction of this run: 0 for left to right, 1 for right
- to left. */
- TUint8 iDirection;
- /** Index of this run after reordering. */
- TInt iIndex;
- /** Start of text; returned by ReorderText(). */
- TInt iStart;
- /** Length of text; returned by ReorderText(). */
- TInt iLength;
- };
-
- IMPORT_C TBidirectionalState();
- IMPORT_C void ReorderLine(TRunInfo* aRunInfo,TInt aRuns,TBool aParStart,TBool aParEnd,TBool aParRightToLeft,
- TChar::TBdCategory aNextCategory,TChar::TBdCategory aNextStrongCategory,
- TBool& aVisualEndIsAmbiguous);
- IMPORT_C void ReorderLine(TRunInfo* aRunInfo,TInt aRuns,TBool aParStart,TBool aParEnd,TBool aParRightToLeft,
- TChar::TBdCategory aNextCategory,TChar::TBdCategory aNextStrongCategory);
- IMPORT_C static TInt ReorderText(const TText* aText,TInt aLength,TBool aParRightToLeft,TText*& aNewText);
- IMPORT_C static void ReverseGroups(TText* aStart,TInt aLength);
- IMPORT_C void Reset();
- IMPORT_C TBool IsDefault() const;
- IMPORT_C TBool operator==(const TBidirectionalState& aState) const;
- IMPORT_C void ExternalizeL(RWriteStream& aDest);
- IMPORT_C void InternalizeL(RReadStream& aSource);
- TBool ParRightToLeft() const { return iStack[0].iEmbeddingLevel & 1; }
-
-private:
- // Bidirectional categories coded as bit flags
- enum TCategory
- {
- ELeftToRight = 1 << TChar::ELeftToRight,
- ELeftToRightEmbedding = 1 << TChar::ELeftToRightEmbedding,
- ELeftToRightOverride = 1 << TChar::ELeftToRightOverride,
- ERightToLeft = 1 << TChar::ERightToLeft,
- ERightToLeftArabic = 1 << TChar::ERightToLeftArabic,
- ERightToLeftEmbedding = 1 << TChar::ERightToLeftEmbedding,
- ERightToLeftOverride = 1 << TChar::ERightToLeftOverride,
- EPopDirectionalFormat = 1 << TChar::EPopDirectionalFormat,
- EEuropeanNumber = 1 << TChar::EEuropeanNumber,
- EEuropeanNumberSeparator = 1 << TChar::EEuropeanNumberSeparator,
- EEuropeanNumberTerminator = 1 << TChar::EEuropeanNumberTerminator,
- EArabicNumber = 1 << TChar::EArabicNumber,
- ECommonNumberSeparator = 1 << TChar::ECommonNumberSeparator,
- ENonSpacingMark = 1 << TChar::ENonSpacingMark,
- EBoundaryNeutral = 1 << TChar::EBoundaryNeutral,
- EParagraphSeparator = 1 << TChar::EParagraphSeparator,
- ESegmentSeparator = 1 << TChar::ESegmentSeparator,
- EWhitespace = 1 << TChar::EWhitespace,
- EOtherNeutral = 1 << TChar::EOtherNeutral,
-
- // useful groups
- EBdControlsGroup = ELeftToRightEmbedding | ERightToLeftEmbedding |
- ELeftToRightOverride | ERightToLeftOverride | EPopDirectionalFormat,
- ELeftToRightGroup = ELeftToRight | EEuropeanNumber | ELeftToRightOverride | ELeftToRightEmbedding,
- ERightToLeftGroup = ERightToLeft | EArabicNumber | ERightToLeftArabic | ERightToLeftOverride |
- ERightToLeftEmbedding,
- EStrongGroup = ELeftToRightEmbedding | ERightToLeftEmbedding
- | ELeftToRightOverride | ERightToLeftOverride
- | ELeftToRight | ERightToLeft | ERightToLeftArabic,
-
- ENoCategory = 0
- };
-
- enum
- {
- EMaxExplicitLevel = 61,
- EMaxLevel = 63,
- EMaxStackLevels = 62
- };
-
- enum TOverrideState
- {
- ENoOverrideState = 0,
- ELeftToRightOverrideState = ELeftToRightOverride,
- ERightToLeftOverrideState = ERightToLeftOverride
- };
-
- class TStackItem
- {
- public:
- TUint8 iEmbeddingLevel; // embedding level
- TOverrideState iOverrideState; // directional override state
- TCategory iStartCategory; // category that started this level; EOtherNeutral if none
- };
-
-private:
- /** The information needed during line reordering.
- WARNING: Class for internal use ONLY. Compatibility is not guaranteed in future releases.
- */
- class TReorderContext
- {
- public:
- void SetNextCategory(TChar::TBdCategory aCat);
- void SetNextStrongCategory(TChar::TBdCategory aCat);
- public:
- /** Category at start of next line, or ON if at the end of the
- paragraph. */
- TCategory iNextCategory;
- /** Which of L, R or AL appears first in the remainder of the
- paragraph, or ON if none. */
- TCategory iNextStrongCategory;
- /** The run array for this line. */
- TRunInfo* iRunInfo;
- /** The length of iRunInfo. */
- TInt iRuns;
- /** Bitmap of categories currently present in iRunInfo. */
- TUint32 iCategories;
- /** Found by the algorithm to set iPreviousStrongCategory. */
- TCategory iLastStrongCategory;
- };
-
-public:
- static TInt GenerateBdRunArray(const TText* aText, TInt aLength,
- TBidirectionalState::TRunInfo* aRun, TInt aMaxRuns);
-
-private:
- const TStackItem& State() const { return iStack[iStackLevel]; }
- TCategory Push(TCategory aStartCategory);
- TCategory Pop();
-
-public:
- TBidirectionalState(TChar::TBdCategory aPrevCat,
- TChar::TBdCategory aPrevStrongCat, TBool aParRightToLeft);
- void HandleBdControls(TReorderContext& aContext);
- void ResolveWeakTypesW1W2W3(TReorderContext& aContext);
- void ResolveWeakTypesW4W5W6(TReorderContext& aContext);
- void ResolveWeakTypesW7(TReorderContext& aContext);
- void ResolveNeutralTypes(TReorderContext& aContext);
- void ResolveImplicitLevels(TReorderContext& aContext);
- void PrepareForNextLine(const TReorderContext& aContext);
- void ReorderRuns(TReorderContext& aContext);
- static TInt CatToNumber(TInt aCat);
- static TCategory CharToBdCat(TChar::TBdCategory aCat);
- static TCategory UintToBdCat(TUint aCat);
- static void DeneutralizeRuns(TRunInfo* aStart, TRunInfo* aEnd,
- TCategory aStartCategory, TCategory aEndCategory);
-private:
- TCategory iPreviousCategory; // category at end of last line, or EStartOfParagraph if at start of par
- TCategory iPreviousStrongCategory; // L or R; derived from embedding level if at start of par
- TInt16 iStackLevel; // current stack level
- TInt8 iPushesBeyond60; // number of times Push called with iStackLevel == 60 and Left-To-Right category
- TInt8 iPushesBeyond61; // number of times Push called with iStackLevel == 61
- TStackItem iStack[EMaxStackLevels]; // the stack of embedding levels
- };
-
-#endif // BIDI_H_