rom/graphics/andrectregionnd.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function AndRectRegion()
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <graphics/regions.h>
  10 #include <proto/exec.h>
  11 #include <clib/macros.h>
  12 #include "intregions.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <proto/graphics.h>
  18
  19         AROS_LH2(struct Region *, AndRectRegionND,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct Region    *, Reg, A0),
  23         AROS_LHA(struct Rectangle *, Rect, A1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 107, Graphics)
  27
  28 /*  FUNCTION
  29         Remove everything inside 'region' that is outside 'rectangle'
  30
  31     INPUTS
  32         region - pointer to Region structure
  33         rectangle - pointer to Rectangle structure
  34
  35     RESULT
  36         The resulting region or NULL in case there's no enough free memory
  37
  38     NOTES
  39
  40     BUGS
  41
  42     SEE ALSO
  43         AndRegionRegion(), OrRectRegion(), XorRectRegion(), ClearRectRegion()
  44         NewRegion()
  45
  46     INTERNALS
  47
  48     HISTORY
  49         27-11-96    digulla automatically created from
  50                             graphics_lib.fd and clib/graphics_protos.h
  51         16-01-97    mreckt  initial version
  52
  53 *****************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct Region *Res;
  58
  59     if
  60     (
  61         /* Is the region empty? */
  62         !Reg->RegionRectangle ||
  63         (
  64             /* Does the rectangle completely cover the region? */
  65             Rect->MinX <= MinX(Reg) &&
  66             Rect->MinY <= MinY(Reg) &&
  67             Rect->MaxX >= MaxX(Reg) &&
  68             Rect->MaxY >= MaxY(Reg)
  69         )
  70     )
  71     {
  72         return CopyRegion(Reg);
  73     }
  74
  75     Res = NewRegion();
  76
  77     if (Res)
  78     {
  79         struct RegionRectangle rr;
  80
  81         rr.bounds = *Rect;
  82         rr.Next   = NULL;
  83         rr.Prev   = NULL;
  84
  85         if
  86         (
  87             _DoOperationBandBand
  88             (
  89                 _AndBandBand,
  90                 MinX(Reg),
  91                 0,
  92                 MinY(Reg),
  93                 0,
  94                 Reg->RegionRectangle,
  95                 &rr,
  96                 &Res->RegionRectangle,
  97                 &Res->bounds,
  98                 GfxBase
  99             )
 100         )
 101         {
 102             _TranslateRegionRectangles(Res->RegionRectangle, -MinX(Res), -MinY(Res));
 103         }
 104         else
 105         {
 106             DisposeRegion(Res);
 107             Res = NULL;
 108         }
 109     }
 110
 111     return Res;
 112
 113     AROS_LIBFUNC_EXIT
 114 } /* AndRectRegion */
 115