--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textbase/sgdi/BidiVisual.cpp	Mon Jul 12 14:38:26 2010 +0800
@@ -0,0 +1,123 @@
+// Copyright (c) 2002-2010 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:
+//
+
+#include "BidiVisual.h"
+#include "BidiCopy.h"
+#include "BidiTextImp.h"
+#include "BidiCompact.h"
+
+extern void BidiPanic(TInt aError);
+
+/** Construct the class with a full paragraph of text and the run array to be used 
+to hold all the runs. 
+
+@param aText The text to be analyzed. This must not be de-allocated until 
+all operations on it through this class have been completed.
+@param aRightToLeft Paragraph directionality.
+@param aRunInfoArray The array to be used to hold the run information. This 
+must not be de-allocated until all operations on it through this class have 
+been completed. Ownership is not passed.
+@param aRunInfoLength The number of TRunInfo<\code> objects in aRunInfoArray. */
+EXPORT_C TBidiLogicalToVisual::TBidiLogicalToVisual(
+	const TDesC& aText,
+	TBool aRightToLeft,
+	TBidirectionalState::TRunInfo* aRunInfoArray,
+	TInt aRunInfoLength)
+	: iText(aText), iRightToLeft(aRightToLeft),
+	iRunInfoArray(aRunInfoArray), iRunInfoArrayLength(aRunInfoLength), iRuns(aRunInfoLength)
+	{
+	}
+
+/** Construct the class with a full paragraph of text and the run array to be used 
+to hold all the runs. Directionality is taken as the implicit directionality 
+of the text passed. 
+
+@param aText The text to be analyzed. This must not be de-allocated until 
+all operations on it through this class have been completed.
+@param aRunInfoArray The array to be used to hold the run information. This 
+must not be de-allocated until all operations on it through this class have 
+been completed. Ownership is not passed.
+@param aRunInfoLength The number of TRunInfo objects in aRunInfoArray. */
+EXPORT_C TBidiLogicalToVisual::TBidiLogicalToVisual(
+	const TDesC& aText,
+	TBidirectionalState::TRunInfo* aRunInfoArray,
+	TInt aRunInfoLength)
+	: iText(aText),
+	iRunInfoArray(aRunInfoArray), iRunInfoArrayLength(aRunInfoLength), iRuns(aRunInfoLength)
+	{
+	iRightToLeft = BidiCopy::ImplicitDirectionalityIsRightToLeft(
+		aText.Ptr(), aText.Length(), 0);
+	}
+
+/** Process the text. This must be called before any call to GetVisualLine. 
+
+@return The number of runs that were or would be required to reorder the complete 
+line. If this is less than the value passed into the constructor as aRunInfoLength, 
+the full text will not be able to be Reordered. */
+EXPORT_C TInt TBidiLogicalToVisual::Reorder()
+	{
+	TInt required = TBidirectionalState::GenerateBdRunArray(
+		iText.Ptr(), iText.Length(), iRunInfoArray, iRunInfoArrayLength);
+	iRuns = Min(required, iRunInfoArrayLength);
+	TBidirectionalState state;
+	state.ReorderLine(iRunInfoArray, iRuns, ETrue, ETrue, iRightToLeft,
+		TChar::EOtherNeutral, TChar::EOtherNeutral);
+	return required;
+	}
+
+/** Get a line of visually ordered text. 
+
+@param aLine Line of text in visual order. There must be aEnd - aStart + 4 
+characters available in the buffer. Only characters within the range aStart 
+to aEnd, plus perhaps a truncation character and up to two zero-width joiners 
+will be present in the string at the end.
+@param aStart The first character in the text that is to be on the line.
+@param aEnd One plus the last character in the test that is to be on the line.
+@param aTruncationChar The character to mark the end of the text, if appropriate, 
+or 0xFFFF if no truncation character is to be used. */ 
+EXPORT_C void TBidiLogicalToVisual::GetVisualLine(TDes& aLine,
+	TInt aStart, TInt aEnd, TChar aTruncationChar)
+	{
+	__ASSERT_ALWAYS(aEnd - aStart + KMinCharAvailable <= aLine.MaxLength(), BidiPanic(KErrArgument));
+
+	if(iText.Length() == 0)
+		{
+		aLine.Zero();
+		return;//We can't do anything with iText, if its length is 0.
+		}
+
+	TRunInfoCompact::TReorderingContext context;
+
+	const TText* input = &iText[0];
+	context.iStart = aStart;
+	context.iEnd = aEnd;
+	context.iTruncation = aTruncationChar;
+	context.iSource = input;
+	context.iJoinsAtStart = TRunInfoCompact::JoinBefore(input, aStart);
+	context.iJoinsAtEnd = aEnd < iText.Length() ? TRunInfoCompact::JoinBefore(input, aEnd) : EFalse;
+
+	aLine.FillZ(1);
+	TText* output = &aLine[0];
+	TText* outputStart = output;
+	TBidirectionalState::TRunInfo* endInfo = iRunInfoArray + iRuns;
+	for (TBidirectionalState::TRunInfo* currentInfo = iRunInfoArray;
+		currentInfo != endInfo; ++currentInfo)
+		{
+		TRunInfoCompact info(currentInfo->iStart,
+			currentInfo->iLength, currentInfo->iDirection);
+		output = info.Reorder(output, context);
+		}
+	aLine.SetLength(output - outputStart);
+	}