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 (IS_RECT_EVIL(Rect))
  60     {
  61         return NewRegion();
  62     }
  63
  64     if
  65     (
  66         /* Is the region empty? */
  67         !Reg->RegionRectangle ||
  68         (
  69             /* Does the rectangle completely cover the region? */
  70             Rect->MinX <= MinX(Reg) &&
  71             Rect->MinY <= MinY(Reg) &&
  72             Rect->MaxX >= MaxX(Reg) &&
  73             Rect->MaxY >= MaxY(Reg)
  74         )
  75     )
  76     {
  77         return CopyRegion(Reg);
  78     }
  79
  80     Res = NewRegion();
  81
  82     if (Res)
  83     {
  84         struct RegionRectangle rr;
  85
  86         rr.bounds = *Rect;
  87         rr.Next   = NULL;
  88         rr.Prev   = NULL;
  89
  90         if
  91         (
  92             _DoOperationBandBand
  93             (
  94                 _AndBandBand,
  95                 MinX(Reg),
  96                 0,
  97                 MinY(Reg),
  98                 0,
  99                 Reg->RegionRectangle,
 100                 &rr,
 101                 &Res->RegionRectangle,
 102                 &Res->bounds,
 103                 GfxBase
 104             )
 105         )
 106         {
 107             _TranslateRegionRectangles(Res->RegionRectangle, -MinX(Res), -MinY(Res));
 108         }
 109         else
 110         {
 111             DisposeRegion(Res);
 112             Res = NULL;
 113         }
 114     }
 115
 116     return Res;
 117
 118     AROS_LIBFUNC_EXIT
 119 } /* AndRectRegion */
 120