rom/graphics/xorrectregionnd.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include <graphics/regions.h>
  10
  11 #include "graphics_intern.h"
  12 #include "intregions.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <proto/graphics.h>
  18
  19         AROS_LH2(struct Region *, XorRectRegionND,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct Region    *, Reg,  A0),
  23         AROS_LHA(struct Rectangle *, Rect, A1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 190, Graphics)
  27
  28 /*  FUNCTION
  29         Exclusive-OR the given rectangle to the given
  30         region
  31
  32     INPUTS
  33         region - pointer to a region structure
  34         rectangle - pointer to a rectangle structure
  35
  36     RESULT
  37         The resulting region or NULL in case there's no enough free memory
  38
  39     NOTES
  40         All relevant data is copied, you may throw away the
  41         given rectangle after calling this function
  42
  43     EXAMPLE
  44
  45     BUGS
  46
  47     SEE ALSO
  48         AndRectRegion(), OrRectRegion(), ClearRectRegion()
  49
  50     INTERNALS
  51
  52     HISTORY
  53         27-11-96    digulla automatically created from
  54                             graphics_lib.fd and clib/graphics_protos.h
  55         19-01-97    mreckt  intital version
  56
  57 *****************************************************************************/
  58 {
  59     AROS_LIBFUNC_INIT
  60
  61     struct Region R;
  62     struct RegionRectangle rr;
  63
  64     if (IS_RECT_EVIL(Rect))
  65     {
  66         /* Empty rectangle. Just make a plain copy of Reg. */
  67         struct Region *ret = NewRegion();
  68
  69         if (_CopyRegionRectangles(Reg, ret, GfxBase))
  70             return ret;
  71
  72         DisposeRegion(ret);
  73         return NULL;
  74     }
  75
  76     InitRegion(&R);
  77
  78     R.bounds = *Rect;
  79     R.RegionRectangle = &rr;
  80
  81     rr.Next = NULL;
  82     MinX(&rr) = MinY(&rr) = 0;
  83     MaxX(&rr) = Rect->MaxX - Rect->MinX;
  84     MaxY(&rr) = Rect->MaxY - Rect->MinY;
  85
  86     return XorRegionRegionND(&R, Reg);
  87
  88     AROS_LIBFUNC_EXIT
  89 } /* XorRectRegion */