gdkpoly-generic.h File Reference

Go to the source code of this file.

Classes
struct	BRESINFO
struct	_EdgeTableEntry
struct	_ScanLineList
struct	EdgeTable
struct	_ScanLineListBlock

Macros
#define	BRESINITPGON(dy, x1, x2, xStart, d, m, m1, incr1, incr2)
#define	BRESINCRPGON(d, minval, m, m1, incr1, incr2)
#define	BRESINITPGONSTRUCT(dmaj, min1, min2, bres)
#define	BRESINCRPGONSTRUCT(bres)    BRESINCRPGON(bres.d, bres.minor_axis, bres.m, bres.m1, bres.incr1, bres.incr2)
#define	CLOCKWISE   1
#define	COUNTERCLOCKWISE   -1
#define	SLLSPERBLOCK   25
#define	EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET)
#define	EVALUATEEDGEEVENODD(pAET, pPrevAET, y)

Typedefs
typedef struct _EdgeTableEntry	EdgeTableEntry
typedef struct _ScanLineList	ScanLineList
typedef struct _ScanLineListBlock	ScanLineListBlock

Macro Definition Documentation

BRESINCRPGON

#define BRESINCRPGON	(		d,
			minval,
			m,
			m1,
			incr1,
			incr2
	)

Value:

    { \
    if (m1 > 0) { \
        if (d > 0) { \
            minval += m1; \
            d += incr1; \
        } \
        else { \
            minval += m; \
            d += incr2; \
        } \
    } else {\
        if (d >= 0) { \
            minval += m1; \
            d += incr1; \
        } \
        else { \
            minval += m; \
            d += incr2; \
        } \
    } \
}

Definition at line 103 of file gdkpoly-generic.h.

BRESINCRPGONSTRUCT

#define BRESINCRPGONSTRUCT

(

bres

)

BRESINCRPGON(bres.d, bres.minor_axis, bres.m, bres.m1, bres.incr1, bres.incr2)

Definition at line 145 of file gdkpoly-generic.h.

BRESINITPGON

#define BRESINITPGON	(		dy,
			x1,
			x2,
			xStart,
			d,
			m,
			m1,
			incr1,
			incr2
	)

Value:

    { \
    int dx;      /* local storage */ \
\
    /* \
     *  if the edge is horizontal, then it is ignored \
     *  and assumed not to be processed.  Otherwise, do this stuff. \
     */ \
    if ((dy) != 0) { \
        xStart = (x1); \
        dx = (x2) - xStart; \
        if (dx < 0) { \
            m = dx / (dy); \
            m1 = m - 1; \
            incr1 = -2 * dx + 2 * (dy) * m1; \
            incr2 = -2 * dx + 2 * (dy) * m; \
            d = 2 * m * (dy) - 2 * dx - 2 * (dy); \
        } else { \
            m = dx / (dy); \
            m1 = m + 1; \
            incr1 = 2 * dx - 2 * (dy) * m1; \
            incr2 = 2 * dx - 2 * (dy) * m; \
            d = -2 * m * (dy) + 2 * dx; \
        } \
    } \
}

Definition at line 80 of file gdkpoly-generic.h.

BRESINITPGONSTRUCT

#define BRESINITPGONSTRUCT	(		dmaj,
			min1,
			min2,
			bres
	)

Value:

        BRESINITPGON(dmaj, min1, min2, bres.minor_axis, bres.d, \
                     bres.m, bres.m1, bres.incr1, bres.incr2)

Definition at line 141 of file gdkpoly-generic.h.

CLOCKWISE

#define CLOCKWISE   1

Definition at line 199 of file gdkpoly-generic.h.

COUNTERCLOCKWISE

#define COUNTERCLOCKWISE   -1

Definition at line 200 of file gdkpoly-generic.h.

EVALUATEEDGEEVENODD

#define EVALUATEEDGEEVENODD	(		pAET,
			pPrevAET,
			y
	)

Value:

   { \
   if (pAET->ymax == y) {          /* leaving this edge */ \
      pPrevAET->next = pAET->next; \
      pAET = pPrevAET->next; \
      if (pAET) \
         pAET->back = pPrevAET; \
   } \
   else { \
      BRESINCRPGONSTRUCT(pAET->bres); \
      pPrevAET = pAET; \
      pAET = pAET->next; \
   } \
}

Definition at line 276 of file gdkpoly-generic.h.

EVALUATEEDGEWINDING

#define EVALUATEEDGEWINDING	(		pAET,
			pPrevAET,
			y,
			fixWAET
	)

Value:

   { \
   if (pAET->ymax == y) {          /* leaving this edge */ \
      pPrevAET->next = pAET->next; \
      pAET = pPrevAET->next; \
      fixWAET = 1; \
      if (pAET) \
         pAET->back = pPrevAET; \
   } \
   else { \
      BRESINCRPGONSTRUCT(pAET->bres); \
      pPrevAET = pAET; \
      pAET = pAET->next; \
   } \
}

Definition at line 253 of file gdkpoly-generic.h.

SLLSPERBLOCK

#define SLLSPERBLOCK   25

Definition at line 231 of file gdkpoly-generic.h.

Typedef Documentation

EdgeTableEntry

typedef struct _EdgeTableEntry EdgeTableEntry

ScanLineList

typedef struct _ScanLineList ScanLineList

ScanLineListBlock

typedef struct _ScanLineListBlock ScanLineListBlock