src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/mesa/src/src/glu/sgi/libnurbs/internals/jarcloc.h

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
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 * Software is furnished to do so, subject to the following conditions:
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 * shall be included in all copies or substantial portions of the Software.
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/*
 * jarcloc.h
 *
 * $Date: 2012/03/29 17:22:18 $ $Revision: 1.1.1.1 $
 * $Header: /cvs/bao-parsec/pkgs/libs/mesa/src/src/glu/sgi/libnurbs/internals/jarcloc.h,v 1.1.1.1 2012/03/29 17:22:18 uid42307 Exp $
 */

#ifndef __glujarcloc_h_
#define __glujarcloc_h_

#include "arc.h"

class Jarcloc {
private:
    Arc_ptr 		arc;
    TrimVertex		*p;
    TrimVertex		*plast;
public:
    inline void		init( Arc_ptr a, long first, long last ) { arc = a; p=&a->pwlArc->pts[first]; plast = &a->pwlArc->pts[last]; }
    inline TrimVertex *	getnextpt( void );
    inline TrimVertex *	getprevpt( void );
    inline void		reverse();
};

inline void
Jarcloc::reverse()
{
    if( plast == &arc->pwlArc->pts[0] )
	plast =  &arc->pwlArc->pts[arc->pwlArc->npts - 1];
    else
	plast =  &arc->pwlArc->pts[0];
}

inline TrimVertex *
Jarcloc::getnextpt()
{
    assert( p <= plast );
    if( p == plast ) {
	arc = arc->next;
	p = &arc->pwlArc->pts[0];
	plast = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
	assert( p < plast );
    }
    return p++;
}
	
inline TrimVertex *
Jarcloc::getprevpt()
{
    assert( p >= plast );
    if( p == plast ) {
	arc = arc->prev;
	p = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
	plast = &arc->pwlArc->pts[0];
	assert( p > plast );
    }
    return p--;
}
#endif /* __glujarcloc_h_ */