rom/graphics/xorrectregion.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(BOOL, XorRectRegion,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(struct Region    *, Reg,  A0),
  21         AROS_LHA(struct Rectangle *, Rect, A1),
  22
  23 /*  LOCATION */
  24         struct GfxBase *, GfxBase, 93, 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         TRUE if the operation was successful, else FALSE
  36         (out of memory)
  37
  38     NOTES
  39         All relevant data is copied, you may throw away the
  40         given rectangle after calling this function
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47         AndRectRegion(), OrRectRegion(), ClearRectRegion()
  48
  49     INTERNALS
  50
  51     HISTORY
  52         27-11-96    digulla automatically created from
  53                             graphics_lib.fd and clib/graphics_protos.h
  54         19-01-97    mreckt  intital version
  55
  56 *****************************************************************************/
  57 {
  58     AROS_LIBFUNC_INIT
  59
  60     struct Region R;
  61     struct RegionRectangle rr;
  62
  63     if (IS_RECT_EVIL(Rect)) return TRUE;
  64
  65     InitRegion(&R);
  66
  67     R.bounds = *Rect;
  68     R.RegionRectangle = &rr;
  69
  70     rr.Next = NULL;
  71     MinX(&rr) = MinY(&rr) = 0;
  72     MaxX(&rr) = Rect->MaxX - Rect->MinX;
  73     MaxY(&rr) = Rect->MaxY - Rect->MinY;
  74
  75     return XorRegionRegion(&R, Reg);
  76
  77     AROS_LIBFUNC_EXIT
  78 } /* XorRectRegion */