gclips.h

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// $Id: gclips.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.
                    Copyright (C) 1993-2006 Xara Group Ltd.
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              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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=================================XARAHEADEREND============================
 */
// Gavin's path clipping code

//
// GClipS.h
//

const UINT32 CLIPPING_STYLE         = 0x0007 ;
const UINT32 CLIPPING_SOURCE_WINDING    = 0x0010 ;
const UINT32 CLIPPING_CLIP_WINDING  = 0x0020 ;
const UINT32 CLIPPING_IS_STROKED        = 0x0040 ;
const UINT32 CLIPPING_IS_CLOSED     = 0x0080 ;

const UINT32 EDGE_CLIP      = 0x0001 ;
const UINT32 EDGE_REVERSED  = 0x0002 ;
const UINT32 EDGE_CURVED        = 0x0004 ;
const UINT32 EDGE_STROKED   = 0x0008 ;


struct Curve {
    POINT   P0 ;
    POINT   P1 ;
    POINT   P2 ;
    POINT   P3 ;
} ;

struct Edge {
    Edge    *LK ;           // Link
    Edge    *RLK ;          // Reverse link - only used to initially sort the edges
    double  DX ;            // Slope = (XE-XS)/(YE-YE)
    INT32   XS,YS ;         // Start point
    INT32   XE,YE ;         // End point
    INT32   XI,YI ;         // Intersection point
    UINT32  FF ;            // Flags
    Curve   *ID ;           // Pointer to curve data - used as curve ID.
    UINT32  TS ;            // Start t parameter
    UINT32  TE ;            // End t parameter
} ;

struct LineEdge {
    Edge    *LK ;
    Edge    *RLK ;
    double  DX ;
    INT32   XS,YS ;
    INT32   XE,YE ;
    INT32   XI,YI ;
    UINT32  FF ;
} ;

struct CurveEdge {
    Edge    *LK ;
    Edge    *RLK ;
    double  DX ;
    INT32   XS,YS ;
    INT32   XE,YE ;
    INT32   XI,YI ;
    UINT32  FF ;
    Curve   *ID ;
    UINT32  TS ;
    UINT32  TE ;
} ;

struct Strip {
    Strip   *FSLK ;             // [L]in[K] to next strip, [F]orward sorted by [S]tart value.
    Strip   *RELK ;             // [L]in[K] to next strip, [R]everse sorted by [E]nd value.
    INT32   YS,YE ;
    union   {
        struct {
            INT32   XSL,XEL ;
            union {
                double  DXL ;
                __int64 FGL ;   // -infinity if curve, +infinity if strip is invalid
            } ;
            UINT32  TSL,TEL ;
            INT32   XSR,XER ;
            union {
                double  DXR ;
                __int64 FGR ;   // -infinity if curve
            } ;
            UINT32  TSR,TER ;
            Curve   *IDL,*IDR ;
        } ;
        struct {
            Strip   *FELK ;     // [L]in[K] to next strip, [F]orward sorted by [E]nd value.
            Strip   *RSLK ;     // [L]in[K] to next strip, [R]everse sorted by [S]tart value.
            INT32   XS,XE ;
            union {
                double  DX ;
                __int64 FG ;
            } ;
            UINT32  TS,TE ;
            Curve   *ID ;
        } ;
    } ;
} ;

struct FilledStrip {
    Strip   *FSLK ;             // [L]in[K] to next strip, [F]orward sorted by [S]tart value.
    Strip   *RELK ;             // [L]in[K] to next strip, [R]everse sorted by [E]nd value.
    INT32   YS,YE ;
    INT32   XSL,XEL ;
    union {
        double  DXL ;
        __int64 FGL ;           // -infinity if curve, +infinity if strip is invalid
    } ;
    UINT32  TSL,TEL ;
    INT32   XSR,XER ;
    union {
        double  DXR ;
        __int64 FGR ;           // -infinity if curve
    } ;
    UINT32  TSR,TER ;
    Curve   *IDL,*IDR ;
} ;

struct LineStrip {
    Strip   *FSLK ;             // [L]in[K] to next strip, [F]orward sorted by [S]tart value.
    Strip   *RELK ;             // [L]in[K] to next strip, [R]everse sorted by [E]nd value.
    INT32   YS,YE ;
    Strip   *FELK ;             // [L]in[K] to next strip, [F]orward sorted by [E]nd value.
    Strip   *RSLK ;             // [L]in[K] to next strip, [R]everse sorted by [S]tart value.
    INT32   XS,XE ;
    union {
        double  DX ;
        __int64 FG ;
    } ;
    UINT32  TS,TE ;
    Curve   *ID ;
} ;


inline bool IsMove ( CONST BYTE Type ) { return (Type & PT_MOVETO)==PT_MOVETO   ; }
inline bool IsLine ( CONST BYTE Type ) { return (Type & PT_MOVETO)==PT_LINETO   ; }
inline bool IsCurve( CONST BYTE Type ) { return (Type & PT_MOVETO)==PT_BEZIERTO ; }

inline bool IsntMove ( CONST BYTE Type ) { return (Type & PT_MOVETO)!=PT_MOVETO   ; }
inline bool IsntLine ( CONST BYTE Type ) { return (Type & PT_MOVETO)!=PT_LINETO   ; }
inline bool IsntCurve( CONST BYTE Type ) { return (Type & PT_MOVETO)!=PT_BEZIERTO ; }


#pragma warning( disable : 4800 )

inline bool IsSourceWinding( UINT32 Flags ) { return Flags & CLIPPING_SOURCE_WINDING ; }
inline bool IsClipWinding  ( UINT32 Flags ) { return Flags & CLIPPING_CLIP_WINDING   ; }
inline bool IsPathStroked  ( UINT32 Flags ) { return Flags & CLIPPING_IS_STROKED     ; }
inline bool IsPathClosed   ( UINT32 Flags ) { return Flags & CLIPPING_IS_CLOSED      ; }

#pragma warning( default : 4800 )


inline UINT32 LO( CONST UINT32 l ) { return l & 0x0000ffff ; }
inline UINT32 HI( CONST UINT32 l ) { return l & 0xffff0000 ; }

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