rom/graphics/xorregionregionnd.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_intern.h"
  10 #include <graphics/regions.h>
  11 #include "intregions.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH2(struct Region *, XorRegionRegionND,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct Region *, R1, A0),
  22         AROS_LHA(struct Region *, R2, A1),
  23
  24 /*  LOCATION */
  25         struct GfxBase *, GfxBase, 191, Graphics)
  26
  27 /*  FUNCTION
  28         Exclusive-OR of one region with another region.
  29
  30     INPUTS
  31         region1 - pointer to a region structure
  32         region2 - pointer to a region structure
  33
  34     RESULT
  35         The resulting region or NULL in case there's no enough free memory
  36
  37     NOTES
  38         This function is not present in AmigaOS
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45         AndRegionRegion(), OrRegionRegion()
  46
  47     INTERNALS
  48
  49     HISTORY
  50         27-11-96    digulla  automatically created from
  51                              graphics_lib.fd and clib/graphics_protos.h
  52         19-01-97    mreckt   intital version
  53
  54         22-09-2001  falemagn changed implementation
  55
  56 *****************************************************************************/
  57 {
  58     AROS_LIBFUNC_INIT
  59
  60     struct Region *R3;
  61
  62     if
  63     (
  64         !R1->RegionRectangle            ||
  65         !R2->RegionRectangle            ||
  66         !overlap(R1->bounds, R2->bounds)
  67     )
  68     {
  69         return OrRegionRegionND(R1, R2);
  70     }
  71
  72     R3 = NewRegion();
  73
  74     if (R3)
  75     {
  76         struct RegionRectangle *Diff1 = NULL;
  77         struct RegionRectangle *Diff2 = NULL;
  78
  79         BOOL res =
  80         _DoOperationBandBand
  81         (
  82             _ClearBandBand,
  83             MinX(R1),
  84             MinX(R2),
  85             MinY(R1),
  86             MinY(R2),
  87             R1->RegionRectangle,
  88             R2->RegionRectangle,
  89             &Diff1,
  90             &R3->bounds,
  91             GfxBase
  92         ) &&
  93         _DoOperationBandBand
  94         (
  95             _ClearBandBand,
  96             MinX(R2),
  97             MinX(R1),
  98             MinY(R2),
  99             MinY(R1),
 100             R2->RegionRectangle,
 101             R1->RegionRectangle,
 102             &Diff2,
 103             &R3->bounds,
 104             GfxBase
 105         ) &&
 106         _DoOperationBandBand
 107         (
 108             _OrBandBand,
 109             0,
 110             0,
 111             0,
 112             0,
 113             Diff1,
 114             Diff2,
 115             &R3->RegionRectangle,
 116             &R3->bounds,
 117             GfxBase
 118         );
 119
 120         _DisposeRegionRectangleList(Diff1, GfxBase);
 121         _DisposeRegionRectangleList(Diff2, GfxBase);
 122
 123         if (res)
 124         {
 125             _TranslateRegionRectangles(R3->RegionRectangle, -MinX(R3), -MinY(R3));
 126         }
 127         else
 128         {
 129             DisposeRegion(R3);
 130             R3 = NULL;
 131         }
 132     }
 133
 134     return R3;
 135
 136     AROS_LIBFUNC_EXIT
 137 }