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/*
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* Copyright (c) 2002 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: Graphics Extension Library header file
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*
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*/
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#ifndef GFXEDGELISTP_H
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#define GFXEDGELISTP_H
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#include <e32std.h>
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#include <e32base.h>
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#include "GfxFloatFixPt.h"
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class TSegSet;
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class TGfxRendererInfoP;
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//****************************************************
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enum TAddSegStatus
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{
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ESegAdd,
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ESegMerge,
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ESegStartNew,
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ESegIgnore
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};
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/**
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* Helping class to store a point using 16 bits for each value.
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*
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* @lib Gfx2D.lib
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* @since 1.0
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*/
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class TPoint16
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{
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public:
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TInt16 iX;
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TInt16 iY;
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};
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/**
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* Helping class to store a size using 16 bits for each value.
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*
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* @lib Gfx2D.lib
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* @since 1.0
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*/
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class TSize16
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{
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public:
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TInt16 iWidth;
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TInt16 iHeight;
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};
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/**
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* Helping class to store a segment edge info.
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*
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* @lib Gfx2D.lib
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* @since 1.0
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*/
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class TGfxSegEdge
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{
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public:
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TInt16 iStart;
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TInt16 iEnd;
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TInt16 iOnlyForFill;
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TInt16 iSign;
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TGfxSegEdge* iNext;
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};
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/**
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* Helping class to store a segment set info.
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*
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* @lib Gfx2D.lib
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* @since 1.0
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*/
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class TSegSet
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{
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public:
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/**
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* Constructor
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*
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* @since 1.0
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* @param aP1 : initial segment point 1
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* @param aP2 : initial segment point 2
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* @return
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*/
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void Construct( TPoint16* aP1, TPoint16* aP2 );
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/**
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* Add a new segment to this set.
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*
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* @since 1.0
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* @param aX : x coordinate of new segment end point
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* @param aY : y coordinate of new segment end point
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* @param aLastSegLenSq : storage for new segment length squared value
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* @param aClosePath : flag to indicate closing of path.
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* @return
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*/
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TAddSegStatus AddSegment( TInt aX,
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TInt aY,
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TUint& aLastSegLenSq,
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TBool aClosePath );
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/**
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*
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*
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* @since 1.0
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* @param aX1 :
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* @param aX2 :
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* @return
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*/
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TBool GetEdge( TInt& aX1, TInt& aX2 );
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/**
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* Initialize the Digital Differential Analyzer (DDA)
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*
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* @since 1.0
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* @return
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*/
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void InitDDA();
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public:
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TPoint16* iTopPoint;
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TPoint16* iBottomPoint;
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TPoint16* iFillOnlySeg;
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TSegSet* iNext;
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TSegSet* iConnect;
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TInt16 iPointAryInc; // -1 or 1
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TInt16 iSign; // -1, 0, or 1
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TInt16 iValid;
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TInt16 iActualBottomY;
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TInt16 iConnectFlag;
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protected:
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// DDA info
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TPoint16* iStart;
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TPoint16* iFinish;
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TPoint16 iInc;
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TPoint16 iPos;
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TSize16 iDifference;
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TInt16 iGradient;
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TInt16 iCount;
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TInt16 iStatus;
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protected:
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/**
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* Construct the Digital Differential Analyzer (DDA)
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*
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* @since 1.0
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* @param aStart : start point
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* @param aFinish : end point
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* @return
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*/
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void ConstructDDA( TPoint16* aStart, TPoint16* aFinish );
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/**
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*
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*
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* @since 1.0
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* @param aPosition :
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* @return
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*/
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TBool SingleStep( TPoint16& aPosition );
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/**
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*
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*
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* @since 1.0
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* @param aStartPosition :
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* @param aEndPosition :
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* @return
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*/
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TBool SingleScanline( TPoint16& aStartPosition,
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TPoint16& aEndPosition );
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/**
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*
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*
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* @since 1.0
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* @return
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*/
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void UpdatePosition();
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};
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/**
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* This class maintains a list of segment edges, used for scanning a line
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* inside two edges.
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*
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* @lib SVGEngine.lib
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* @since 1.0
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*/
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class CGfxEdgeListP : public CBase
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{
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public:
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/**
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* Two-phase constructor.
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*
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* @since 1.0
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* @param aRenderInfo : rendering info
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* @return
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*/
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static CGfxEdgeListP* NewLC( TGfxRendererInfoP* aRenderInfo );
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/**
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* Two-phase constructor.
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*
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* @since 1.0
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* @param aRenderInfo : rendering info
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* @return
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*/
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static CGfxEdgeListP* NewL( TGfxRendererInfoP* aRenderInfo );
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/**
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* Destructor.
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*
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* @since 1.0
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* @return
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*/
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~CGfxEdgeListP();
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public:
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/**
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* Get the start point in the edge list.
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*
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* @since 1.0
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* @param aX : storage for starting point x coordinate.
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* @param aY : storage for starting point y coordinate.
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* @return
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*/
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void StartPoint( TFloatFixPt& aX, TFloatFixPt& aY );
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/**
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* Add a new point to this list.
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*
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* @since 1.0
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* @param aX : x coordinate of point
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* @param aY : y coordinate of point
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* @param aFillOnly : fill-onyl flag
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* @param aClosePath : close-path flag
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* @return
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*/
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void AddPoint( TFloatFixPt & aX,
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TFloatFixPt & aY,
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TBool aFillOnly,
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TBool aClosePath );
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/**
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* Clear all points in this list.
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*
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* @since 1.0
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* @return
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*/
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void Reset();
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/**
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* Intialize this edge list.
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*
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* @since 1.0
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* @return
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*/
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void SetupEdgeList();
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/**
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* Update the active edge.
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*
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* @since 1.0
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* @param aY : line y coordinate
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* @return
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*/
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void UpdateActiveEdge( TInt aY );
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/**
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* Get the active segment edge.
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*
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* @since 1.0
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* @return segment edge.
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*/
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TGfxSegEdge* EdgeList();
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/**
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* Adjust the level of detail to the given vertex size.
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*
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* @since 1.0
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* @param aVertexSize : vertex size
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* @return
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*/
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void AdjustShapeComplexityL( TInt32 aVertexSize );
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protected:
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/**
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* Constructor
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*
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* @since 1.0
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* @return
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*/
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CGfxEdgeListP();
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/**
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* Constructor
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*
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* @since 1.0
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* @param iRenderInfo : rendering info
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* @return
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*/
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CGfxEdgeListP( TGfxRendererInfoP* iRenderInfo );
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/**
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* Second-phase of construction
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*
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* @since 1.0
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* @return
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*/
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void ConstructL();
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private:
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/**
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* Add a new edge.
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*
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* @since 1.0
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* @param aSt : start point
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* @param aEd : end point
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* @return
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*/
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TGfxSegEdge* AddEdge( TInt32 aSt, TInt32 aEd );//, TInt aSegSign);
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/**
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* Add the given set of segments to this list.
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*
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* @since 1.0
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* @param aWaitingList : flag to wait
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* @param aSegSet : set of segments
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* @return
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*/
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void InsertToList( TBool aWaitingList, TSegSet& aSegSet );
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/**
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* Check and Connect
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*
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* @since 1.0
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* @return
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*/
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void CheckAndConnect();
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/**
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* Simple update of active edge.
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*
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* @since 1.0
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* @param aY : line y coordinate
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* @return
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*/
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void UpdateActiveEdgeSimple( TInt aY );
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protected:
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TInt32 iMinX, iMinY;
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TInt32 iMaxX, iMaxY;
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TGfxSegEdge* iEdges;
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TInt iEdgesCount;
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TUint iPolygonAreaSize;
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TUint iLastSegLenSq;
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TPoint16* iPoints;
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TSegSet* iSegset;
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TSegSet* iWaitingSegList;
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TSegSet* iActiveSegList;
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TGfxSegEdge* iSortedEdges;
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TInt iPointsCount;
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TInt iSegsetCount;
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TInt iPointsCountMax;
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TInt iSegsetCountMax;
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TInt iEdgesCountMax;
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TGfxRendererInfoP* iRenderInfo;
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private:
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TSegSet* iSegListForSimple[2];
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TSegSet* iStartSeg;
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TBool iIsNewOutlineStarted;
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TInt iSubPathSegmentCount;
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private:
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friend class TGfxPolygonRendererP;
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friend class TGfxStrokeRendererP;
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friend class CGfx2dGc;
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friend class TSegSet;
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};
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#endif // GFXEDGELISTP_H
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