rom/graphics/orrectregion.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function OrRectRegion()
   6     Lang: english
   7 */
   8
   9 #include <exec/memory.h>
  10 #include <graphics/regions.h>
  11 #include <proto/exec.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(BOOL, OrRectRegion,
  22
  23 /*  SYNOPSIS */
  24         AROS_LHA(struct Region    *, Reg,  A0),
  25         AROS_LHA(struct Rectangle *, Rect, A1),
  26
  27 /*  LOCATION */
  28         struct GfxBase *, GfxBase, 85, Graphics)
  29
  30 /*  FUNCTION
  31         Add the given Rectangle to the given Region (if not
  32         already there)
  33
  34     INPUTS
  35         region - pointer to Region structure
  36         rectangle - pointer to Rectangle structure
  37
  38     RESULT
  39         TRUE if the operation was successful, else FALSE
  40         (out of memory)
  41
  42     NOTES
  43         All relevant data is copied, you may throw away the
  44         given rectangle after calling this function
  45
  46     EXAMPLE
  47
  48     BUGS
  49
  50     SEE ALSO
  51         AndRectRegion(), XorRectRegion(), ClearRectRegion()
  52
  53     INTERNALS
  54
  55     HISTORY
  56         27-11-96    digulla automatically created from
  57                             graphics_lib.fd and clib/graphics_protos.h
  58         16-01-97    mreckt  initial version
  59
  60 *****************************************************************************/
  61 {
  62     AROS_LIBFUNC_INIT
  63
  64     if (IS_RECT_EVIL(Rect)) return TRUE;
  65
  66     if (Reg->RegionRectangle)
  67     {
  68         /* Region is not empty. Do the complete algorithm. */
  69         struct Region Res;
  70         struct RegionRectangle rr;
  71
  72         InitRegion(&Res);
  73
  74         rr.bounds = *Rect;
  75         rr.Next   = NULL;
  76         rr.Prev   = NULL;
  77
  78         if (_DoOperationBandBand(_OrBandBand,
  79                                  MinX(Reg), 0, MinY(Reg), 0,
  80                                  Reg->RegionRectangle, &rr, &Res.RegionRectangle, &Res.bounds, GfxBase))
  81         {
  82             ClearRegion(Reg);
  83
  84             *Reg = Res;
  85             _TranslateRegionRectangles(Res.RegionRectangle, -MinX(&Res), -MinY(&Res));
  86
  87             return TRUE;
  88         }
  89     }
  90     else
  91     {
  92         /* Optimized version for empty destination Region. Just add a single rectangle. */
  93         struct RegionRectangle *rr = _NewRegionRectangle(&Reg->RegionRectangle, GfxBase);
  94
  95         if (rr)
  96         {
  97             Reg->bounds = *Rect;
  98
  99             rr->bounds.MinX = 0;
 100             rr->bounds.MinY = 0;
 101             rr->bounds.MaxX = Rect->MaxX - Rect->MinX;
 102             rr->bounds.MaxY = Rect->MaxY - Rect->MinY;
 103
 104             return TRUE;
 105         }
 106     }
 107
 108     return FALSE;
 109
 110     AROS_LIBFUNC_EXIT
 111 } /* OrRectRegion */