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Xregion.h

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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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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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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_ */

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