gdkregion-generic.h

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/* $TOG: region.h /main/9 1998/02/06 17:50:30 kaleb $ */
/************************************************************************
 
Copyright 1987, 1998  The Open Group
 
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in this Software without prior written authorization from The Open Group.
 
 
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 
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************************************************************************/
 
#ifndef __GDK_REGION_GENERIC_H__
#define __GDK_REGION_GENERIC_H__
 
typedef GdkSegment GdkRegionBox;
 
/* 
 *   clip region
 */
 
struct _GdkRegion
{
  long size;
  long numRects;
  GdkRegionBox *rects;
  GdkRegionBox extents;
};
 
/*  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;\
        }
 
#define GROWREGION(reg, nRects) {                                          \
          if ((nRects) == 0) {                                             \
            if ((reg)->rects != &(reg)->extents) {                         \
              g_free ((reg)->rects);                                       \
              (reg)->rects = &(reg)->extents;                              \
            }                                                              \
          }                                                                \
          else if ((reg)->rects == &(reg)->extents) {                      \
            (reg)->rects = g_new (GdkRegionBox, (nRects));                 \
            (reg)->rects[0] = (reg)->extents;                              \
          }                                                                \
          else                                                             \
            (reg)->rects = g_renew (GdkRegionBox, (reg)->rects, (nRects)); \
          (reg)->size = (nRects);                                          \
       }                                 
 
/*
 *   Check to see if there is enough memory in the present region.
 */
#define MEMCHECK(reg, rect, firstrect){                                          \
        if ((reg)->numRects >= ((reg)->size - 1)) {                              \
          GROWREGION(reg,2*(reg)->size);                                         \
          (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 {
  GdkPoint pts[NUMPTSTOBUFFER];
  struct _POINTBLOCK *next;
} POINTBLOCK;
 
#endif /* __GDK_REGION_GENERIC_H__ */