gblend.h

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// $Id: gblend.h 751 2006-03-31 15:43:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
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----------------------------------

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=================================XARAHEADEREND============================
 */
// Gavin's blend code

//
// GBlend.h
//

/************************************************************************************************

void Define(
        PPOINT  Src0Points,         First source path
        PBYTE   Src0Types,
        UINT32  Src0Length,
        PPOINT  Src1Points,         Second source path
        PBYTE   Src1Types,
        UINT32  Src1Length,
        BOOL    Flag,               Set for 1 to 1 blending
        UINT32  pFlatness,          Flatness
        PUINT32 Buffer,             Workspace
        UINT32  BufferLength        Workspace length
    ) ;

This call should be made once in order to set up a blend. It will blend one subpath to one other
subpath. Each subpath is treated as though it is unclosed.

Paths are expected to be in the form of a single subpath. ClosePath options are ignored.
Workspace required is 4 bytes per path element per path.

Note that currently (04/11/94) there is a lack of error handling. Paths should be in the correct
format.


UINT32 Blend(
        double  pRatio,             Blend ratio of 1st path to 2nd path
        PPOINT  DstPoints,          Destination path
        PBYTE   DstTypes,
        UINT32  DstLength           Maximum length of destination path.
    ) ;

This call actually performs a blend. It should be called once for each required value of pRatio.

************************************************************************************************/

class GBlend
{
public:
    void Define(
        PPOINT  Src0Points,
        PBYTE   Src0Types,
        UINT32  Src0Length,
        PPOINT  Src1Points,
        PBYTE   Src1Types,
        UINT32  Src1Length,
        BOOL    Flag,
        UINT32  pFlatness,
        PUINT32 Buffer,
        UINT32  BufferLength
    ) ;
    UINT32 Blend(
        double  pRatio,
        PPOINT  DstPoints,
        PBYTE   DstTypes,
        INT32   DstLength
    ) ;
private:
    BOOL    Is1to1 ;
    UINT32  Flatness ;
    INT32   Ratio ;
    PPOINT  S0Points ; PBYTE S0Types ; UINT32 S0Length ; PUINT32 LengthPtr0 ; PUINT32 EndLengthPtr0 ;
    PPOINT  S1Points ; PBYTE S1Types ; UINT32 S1Length ; PUINT32 LengthPtr1 ; PUINT32 EndLengthPtr1 ;
    PPOINT   OPoints ; PBYTE  OTypes ; size_t OLength ;
    PPOINT  IPoints0 ; PBYTE ITypes0 ; UINT32 ILength0 ;
    PPOINT  IPoints1 ; PBYTE ITypes1 ; UINT32 ILength1 ;
    PUINT32 LPtr0 ; BYTE Type0 ; UINT32 Length0 ; INT32 Match0 ; UINT32 Total0 ;
    PUINT32 LPtr1 ; BYTE Type1 ; UINT32 Length1 ; INT32 Match1 ; UINT32 Total1 ;
    POINT P00,P01,P02,P03 ;
    POINT P10,P11,P12,P13 ;
    POINT L1,L2,M,R1,R2 ;

    BOOL CalcPathLengths(
        PPOINT  Points,
        PBYTE   Types,
        UINT32  Length,
        PUINT32 Buffer,
        UINT32  BufferLength,
        PUINT32 &BufferEnd
    ) ;
    BOOL BlendNtoN() ;
    BOOL BlendMtoN() ;
    BOOL Blend1to1() ;
    BOOL BlendPoint( BYTE Type, POINT P0, POINT P1 ) ;
    BOOL BlendCurve( POINT P01,POINT P02,POINT P03, POINT P11,POINT P12,POINT P13 ) ;
    void Match    ( PUINT32 Ptr, PUINT32 EndPtr, UINT32 Length, INT32 &Match, UINT32 &Total ) ;
    void MatchLast( PUINT32 Ptr, PUINT32 EndPtr, UINT32 Length, INT32 &Match, UINT32 &Total ) ;
    void ReadPath0() ; void ReadPathStart0() ;
    void ReadPath1() ; void ReadPathStart1() ;
    void Split( POINT P0,POINT P1,POINT P2,POINT P3, INT32 N,UINT32 D ) ;
    INT32 BezierLength( POINT P0, POINT P1, POINT P2, POINT P3 )    ;
    INT32 FlattenSplit( POINT P0, POINT P1, POINT P2, POINT P3 ) ;
} ;

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