rom/graphics/andrectregionnd.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function AndRectRegion()
   6     Lang: english
   7 */
   8
   9 #include <graphics/regions.h>
  10 #include <proto/exec.h>
  11 #include <clib/macros.h>
  12
  13 #include "graphics_intern.h"
  14 #include "intregions.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19 #include <proto/graphics.h>
  20
  21         AROS_LH2(struct Region *, AndRectRegionND,
  22
  23 /*  SYNOPSIS */
  24         AROS_LHA(struct Region    *, Reg, A0),
  25         AROS_LHA(struct Rectangle *, Rect, A1),
  26
  27 /*  LOCATION */
  28         struct GfxBase *, GfxBase, 186, Graphics)
  29
  30 /*  FUNCTION
  31         Remove everything inside 'region' that is outside 'rectangle'
  32
  33     INPUTS
  34         region - pointer to Region structure
  35         rectangle - pointer to Rectangle structure
  36
  37     RESULT
  38         The resulting region or NULL in case there's no enough free memory
  39
  40     NOTES
  41
  42     BUGS
  43
  44     SEE ALSO
  45         AndRegionRegion(), OrRectRegion(), XorRectRegion(), ClearRectRegion()
  46         NewRegion()
  47
  48     INTERNALS
  49
  50     HISTORY
  51         27-11-96    digulla automatically created from
  52                             graphics_lib.fd and clib/graphics_protos.h
  53         16-01-97    mreckt  initial version
  54
  55 *****************************************************************************/
  56 {
  57     AROS_LIBFUNC_INIT
  58
  59     struct Region *Res = NewRegion();
  60
  61     if (IS_RECT_EVIL(Rect))
  62     {
  63         return Res;
  64     }
  65
  66     if (!Reg->RegionRectangle)
  67     {
  68         /* The region is already empty, return empty copy */
  69         return Res;
  70     }
  71
  72     if (Res)
  73     {
  74         if (Rect->MinX <= MinX(Reg) &&
  75             Rect->MinY <= MinY(Reg) &&
  76             Rect->MaxX >= MaxX(Reg) &&
  77             Rect->MaxY >= MaxY(Reg))
  78         {
  79             /* The rectangle completely covers the region. Make a plain copy. */
  80             if (_CopyRegionRectangles(Reg, Res, GfxBase))
  81                 return Res;
  82         }
  83         else
  84         {
  85             struct RegionRectangle rr;
  86
  87             rr.bounds = *Rect;
  88             rr.Next   = NULL;
  89             rr.Prev   = NULL;
  90
  91             if (_DoOperationBandBand(_AndBandBand,
  92                                      MinX(Reg), 0, MinY(Reg), 0,
  93                                      Reg->RegionRectangle, &rr, &Res->RegionRectangle, &Res->bounds, GfxBase))
  94             {
  95                 _TranslateRegionRectangles(Res->RegionRectangle, -MinX(Res), -MinY(Res));
  96
  97                 return Res;
  98             }
  99         }
 100
 101         DisposeRegion(Res);
 102     }
 103
 104     return NULL;
 105
 106     AROS_LIBFUNC_EXIT
 107 } /* AndRectRegion */
 108