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/* Stuff needed for drawing thin (zero width) lines */
#define X_AXIS 0
#define Y_AXIS 1
#define OUT_LEFT 0x08
#define OUT_RIGHT 0x04
#define OUT_ABOVE 0x02
#define OUT_BELOW 0x01
#define MI_OUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
{\
if (x < xmin) outcode |= OUT_LEFT;\
if (x > xmax) outcode |= OUT_RIGHT;\
if (y < ymin) outcode |= OUT_ABOVE;\
if (y > ymax) outcode |= OUT_BELOW;\
}
#define round(dividend, divisor) \
( (((dividend)<<1) + (divisor)) / ((divisor)<<1) )
#define ceiling(m,n) (((m)-1)/(n) + 1)
#define SWAPINT(i, j) \
{ int _t = i; i = j; j = _t; }
#define SWAPINT_PAIR(x1, y1, x2, y2)\
{ int t = x1; x1 = x2; x2 = t;\
t = y1; y1 = y2; y2 = t;\
}
#define AbsDeltaAndSign(_p2, _p1, _absdelta, _sign) \
(_sign) = 1; \
(_absdelta) = (_p2) - (_p1); \
if ( (_absdelta) < 0) { (_absdelta) = -(_absdelta); (_sign) = -1; }
#ifndef FIXUP_X_MAJOR_ERROR
#define FIXUP_X_MAJOR_ERROR(_e, _signdx, _signdy) \
(_e) -= ( (_signdx) < 0)
#endif
#ifndef FIXUP_Y_MAJOR_ERROR
#define FIXUP_Y_MAJOR_ERROR(_e, _signdx, _signdy) \
(_e) -= ( (_signdy) < 0)
#endif
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