graphicsdeviceinterface/gdi/sgdi/BidiTextImp.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef BIDITEXTIMP_H_
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#define BIDITEXTIMP_H_
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#include "BidiText.h"
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class TRunInfoCompact;
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class TBidiTextImp : public TBidiText
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/** This is the implementation for the class TBidiText. It is so designed so 
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that it only occupies a single heap cell. This means that it is efficient in 
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memory usage, and can be placed on the cleanup stack without being a C-class.
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@internalComponent */
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	{
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public:
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	static TBidiTextImp* NewL(TInt aLength, TInt aMaxLines, TInt aBdRunArraySize);
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	static TBidiTextImp* Imp(TBidiText* aSelf);
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	static const TBidiTextImp* Imp(const TBidiText* aSelf);
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	static TInt AlignedSizeOf();
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	TText* LogicalText();
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	TText* VisualText();
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	TInt16* LineWidthArray();
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	TRunInfoCompact* BidiRunArray();
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	const TText* LogicalText() const
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		{ return const_cast<TBidiTextImp*>(this)->LogicalText(); }
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	const TText* VisualText() const
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		{ return const_cast<TBidiTextImp*>(this)->VisualText(); }
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	const TInt16* LineWidthArray() const
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		{ return const_cast<TBidiTextImp*>(this)->LineWidthArray(); }
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	const TRunInfoCompact* BidiRunArray() const
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		{ return const_cast<TBidiTextImp*>(this)->BidiRunArray(); }
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	/**
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	@return Current truncation character.
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	@internalComponent */
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	TChar TruncationChar() const
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		{ return static_cast<TInt>(iTruncationCharPlane << 16)
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		+ iTruncationChar16; }
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	inline TInt TextLength() const;
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	inline void SetTextLength(TInt aLength);
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	inline TBool HasRightToLeftDirectionality() const;
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	inline void SetRightToLeftDirectionality(TBool aRightToLeftDirectionality);
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	static TInt RequiredBytes(TInt aLendth, TInt aMaxLines, TInt aBdRunArraySize);
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	inline TInt AllocatedTextDataBytes() const;
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private:
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	inline void SetAllocatedTextDataBytes(TInt aMaxBytes);
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	enum TFlags
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		{
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		EFRightToLeft = 0x10000000,
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		EFTruncateAtBeginning = 0x20000000
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		};
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	enum { ELengthMask = 0x0FFFFFFF };
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	TInt iTextLengthAndFlags;
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	TInt iTextDataBytes;	// Number of bytes allocated off the end of the object for text data
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public:	
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	TInt iVisualOrderedTextLength;
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	TUint16 iWrappingWidth;
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	TUint16 iBidiRunArrayLength;
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	TUint8 iLines;
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	TUint8 iTruncationCharPlane;
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	TUint16 iTruncationChar16;
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	};
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TInt SizeLineBreak(const TText* aText);
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const TText* FindEndOfThisLine(const TText* aStart, const TText* aEnd);
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TInt NumberOfLines(const TText* aStart, const TText* aEnd);
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inline TBidiTextImp* TBidiTextImp::Imp(TBidiText* aSelf)
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	{ return static_cast<TBidiTextImp*>(aSelf); }
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inline const TBidiTextImp* TBidiTextImp::Imp(const TBidiText* aSelf)
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	{ return static_cast<const TBidiTextImp*>(aSelf); }
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inline TInt TBidiTextImp::AlignedSizeOf()
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	{ return ((sizeof(TBidiTextImp) + 1) & 0xFFFFFFFE); }
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inline TInt TBidiTextImp::TextLength() const
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	{ return iTextLengthAndFlags & TBidiTextImp::ELengthMask; }
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inline void TBidiTextImp::SetTextLength(TInt aLength)
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	{ iTextLengthAndFlags &= ~ELengthMask;					// clear old size bits
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	  iTextLengthAndFlags |= (aLength&ELengthMask); }		// set new size bits
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inline TBool TBidiTextImp::HasRightToLeftDirectionality() const
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	{ return iTextLengthAndFlags&TBidiTextImp::EFRightToLeft; }
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inline void TBidiTextImp::SetRightToLeftDirectionality(TBool aRightToLeftDirectionality)
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	{
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	if (aRightToLeftDirectionality)
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		iTextLengthAndFlags |= TBidiTextImp::EFRightToLeft;
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	else
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		iTextLengthAndFlags &= ~TBidiTextImp::EFRightToLeft;
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	}
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inline TInt TBidiTextImp::AllocatedTextDataBytes() const
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	{ return iTextDataBytes; }
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inline void TBidiTextImp::SetAllocatedTextDataBytes(TInt aTextDataBytes)
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	{ iTextDataBytes = aTextDataBytes; }
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/**
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Bidi panic.
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@internalComponent
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*/
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void Panic(TInt aError);
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#endif