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//usr/include/X11/Xregion.h

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#ifndef _X11_XREGION_H_
#define _X11_XREGION_H_

typedef struct {
    short x1, x2, y1, y2;
} Box, BOX, BoxRec, *BoxPtr;

typedef struct {
    short x, y, width, height;
}RECTANGLE, RectangleRec, *RectanglePtr;

#define TRUE 1
#define FALSE 0
#define MAXSHORT 32767
#define MINSHORT -MAXSHORT
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif

/*
 *   clip region
 */

typedef struct _XRegion {
    long size;
    long numRects;
    BOX *rects;
    BOX extents;
} REGION;

/* Xutil.h contains the declaration:
 * typedef struct _XRegion *Region;
 */

/*  1 if two BOXs overlap.
 *  0 if two BOXs do not overlap.
 *  Remember, x2 and y2 are not in the region
 */
#define EXTENTCHECK(r1, r2) \
	((r1)->x2 > (r2)->x1 && \
	 (r1)->x1 < (r2)->x2 && \
	 (r1)->y2 > (r2)->y1 && \
	 (r1)->y1 < (r2)->y2)

/*
 *  update region extents
 */
#define EXTENTS(r,idRect){\
            if((r)->x1 < (idRect)->extents.x1)\
              (idRect)->extents.x1 = (r)->x1;\
            if((r)->y1 < (idRect)->extents.y1)\
              (idRect)->extents.y1 = (r)->y1;\
            if((r)->x2 > (idRect)->extents.x2)\
              (idRect)->extents.x2 = (r)->x2;\
            if((r)->y2 > (idRect)->extents.y2)\
              (idRect)->extents.y2 = (r)->y2;\
        }

/*
 *   Check to see if there is enough memory in the present region.
 */
#define MEMCHECK(reg, rect, firstrect){\
        if ((reg)->numRects >= ((reg)->size - 1)){\
          BoxPtr tmpRect = Xrealloc ((firstrect), \
                                     (2 * (sizeof(BOX)) * ((reg)->size))); \
          if (tmpRect == NULL) \
            return(0);\
          (firstrect) = tmpRect; \
          (reg)->size *= 2;\
          (rect) = &(firstrect)[(reg)->numRects];\
         }\
       }

/*  this routine checks to see if the previous rectangle is the same
 *  or subsumes the new rectangle to add.
 */

#define CHECK_PREVIOUS(Reg, R, Rx1, Ry1, Rx2, Ry2)\
               (!(((Reg)->numRects > 0)&&\
                  ((R-1)->y1 == (Ry1)) &&\
                  ((R-1)->y2 == (Ry2)) &&\
                  ((R-1)->x1 <= (Rx1)) &&\
                  ((R-1)->x2 >= (Rx2))))

/*  add a rectangle to the given Region */
#define ADDRECT(reg, r, rx1, ry1, rx2, ry2){\
    if (((rx1) < (rx2)) && ((ry1) < (ry2)) &&\
        CHECK_PREVIOUS((reg), (r), (rx1), (ry1), (rx2), (ry2))){\
              (r)->x1 = (rx1);\
              (r)->y1 = (ry1);\
              (r)->x2 = (rx2);\
              (r)->y2 = (ry2);\
              EXTENTS((r), (reg));\
              (reg)->numRects++;\
              (r)++;\
            }\
        }

/*  add a rectangle to the given Region */
#define ADDRECTNOX(reg, r, rx1, ry1, rx2, ry2){\
            if ((rx1 < rx2) && (ry1 < ry2) &&\
                CHECK_PREVIOUS((reg), (r), (rx1), (ry1), (rx2), (ry2))){\
              (r)->x1 = (rx1);\
              (r)->y1 = (ry1);\
              (r)->x2 = (rx2);\
              (r)->y2 = (ry2);\
              (reg)->numRects++;\
              (r)++;\
            }\
        }

#define EMPTY_REGION(pReg) pReg->numRects = 0

#define REGION_NOT_EMPTY(pReg) pReg->numRects

#define INBOX(r, x, y) \
      ( ( ((r).x2 >  x)) && \
        ( ((r).x1 <= x)) && \
        ( ((r).y2 >  y)) && \
        ( ((r).y1 <= y)) )

/*
 * number of points to buffer before sending them off
 * to scanlines() :  Must be an even number
 */
#define NUMPTSTOBUFFER 200

/*
 * used to allocate buffers for points and link
 * the buffers together
 */
typedef struct _POINTBLOCK {
    XPoint pts[NUMPTSTOBUFFER];
    struct _POINTBLOCK *next;
} POINTBLOCK;

#endif /* _X11_XREGION_H_ */