rom/graphics/xorrectregionnd.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function XorRectRegion()
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <graphics/regions.h>
  10 #include "intregions.h"
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <proto/graphics.h>
  16
  17         AROS_LH2(struct Region *, XorRectRegionND,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(struct Region    *, Reg,  A0),
  21         AROS_LHA(struct Rectangle *, Rect, A1),
  22
  23 /*  LOCATION */
  24         struct GfxBase *, GfxBase, 152, Graphics)
  25
  26 /*  FUNCTION
  27         Exclusive-OR the given rectangle to the given
  28         region
  29
  30     INPUTS
  31         region - pointer to a region structure
  32         rectangle - pointer to a rectangle structure
  33
  34     RESULT
  35         The resulting region or NULL in case there's no enough free memory
  36
  37     NOTES
  38         All relevant data is copied, you may throw away the
  39         given rectangle after calling this function
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         AndRectRegion(), OrRectRegion(), ClearRectRegion()
  47
  48     INTERNALS
  49
  50     HISTORY
  51         27-11-96    digulla automatically created from
  52                             graphics_lib.fd and clib/graphics_protos.h
  53         19-01-97    mreckt  intital version
  54
  55 *****************************************************************************/
  56 {
  57     AROS_LIBFUNC_INIT
  58
  59     struct Region R;
  60     struct RegionRectangle rr;
  61
  62     InitRegion(&R);
  63
  64     R.bounds = *Rect;
  65     R.RegionRectangle = &rr;
  66
  67     rr.Next = NULL;
  68     MinX(&rr) = MinY(&rr) = 0;
  69     MaxX(&rr) = Rect->MaxX - Rect->MinX;
  70     MaxY(&rr) = Rect->MaxY - Rect->MinY;
  71
  72     return XorRegionRegionND(&R, Reg);
  73
  74     AROS_LIBFUNC_EXIT
  75 } /* XorRectRegion */