xref: /xsrc/external/mit/xorg-server/dist/mi/mifpoly.h

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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
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******************************************************************/

#ifndef __MIFPOLY_H__
#define __MIFPOLY_H__

#include <X11/Xfuncproto.h>

#define EPSILON	0.000001
#define ISEQUAL(a,b) (Fabs((a) - (b)) <= EPSILON)
#define UNEQUAL(a,b) (Fabs((a) - (b)) > EPSILON)
#define WITHINHALF(a, b) (((a) - (b) > 0.0) ? (a) - (b) < 0.5 : \
					     (b) - (a) <= 0.5)
#define ROUNDTOINT(x)   ((int) (((x) > 0.0) ? ((x) + 0.5) : ((x) - 0.5)))
#define ISZERO(x) 	(Fabs((x)) <= EPSILON)
#define PTISEQUAL(a,b) (ISEQUAL(a.x,b.x) && ISEQUAL(a.y,b.y))
#define PTUNEQUAL(a,b) (UNEQUAL(a.x,b.x) || UNEQUAL(a.y,b.y))
#define PtEqual(a, b) (((a).x == (b).x) && ((a).y == (b).y))

#define NotEnd		0
#define FirstEnd	1
#define SecondEnd	2

#define SQSECANT 108.856472512142 /* 1/sin^2(11/2) - for 11o miter cutoff */
#define D2SECANT 5.21671526231167 /* 1/2*sin(11/2) - max extension per width */

static _X_INLINE int ICEIL(double x)
{
    int _cTmp = x;
    return ((x == _cTmp) || (x < 0.0)) ? _cTmp : _cTmp+1;
}

/* Point with sub-pixel positioning.  In this case we use doubles, but
 * see mifpolycon.c for other suggestions
 */
typedef struct _SppPoint {
	double	x, y;
} SppPointRec, *SppPointPtr;

typedef struct _SppArc {
	double	x, y, width, height;
	double	angle1, angle2;
} SppArcRec, *SppArcPtr;

/* mifpolycon.c */

extern void miFillSppPoly(
    DrawablePtr /*dst*/,
    GCPtr /*pgc*/,
    int /*count*/,
    SppPointPtr /*ptsIn*/,
    int /*xTrans*/,
    int /*yTrans*/,
    double /*xFtrans*/,
    double /*yFtrans*/
);

#endif /* __MIFPOLY_H__ */