rom/graphics/clearregionregion.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: (AROS only) Graphics function ClearRegionRegion()
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <proto/graphics.h>
  10 #include <graphics/regions.h>
  11 #include "intregions.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <clib/graphics_protos.h>
  17
  18         AROS_LH2(BOOL, ClearRegionRegion,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct Region *, R1, A0),
  22         AROS_LHA(struct Region *, R2, A1),
  23
  24 /*  LOCATION */
  25         struct GfxBase *, GfxBase, 187, Graphics)
  26
  27 /*  FUNCTION
  28         Clear the given Region region1 from the given Region region2
  29         leaving the result in region2.
  30
  31     INPUTS
  32         region1 - pointer to a Region structure
  33         region2 - pointer to a Rectangle structure
  34
  35     RESULT
  36         FALSE if not enough memory was available, else TRUE
  37
  38     NOTES
  39         This function does not exist in AmigaOS.
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         ClearRectRegion(), AndRectRegion(), OrRectRegion(), XorRectRegion()
  47
  48     INTERNALS
  49
  50     HISTORY
  51         13-12-2000  stegerg implemented
  52
  53 *****************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct Region R3;
  58
  59     /* If the regions don't overlap just return */
  60     if (!overlap(R1->bounds, R2->bounds))
  61         return TRUE;
  62
  63     InitRegion(&R3);
  64
  65     if
  66     (
  67         _DoOperationBandBand
  68         (
  69             _ClearBandBand,
  70             MinX(R1),
  71             MinX(R2),
  72             MinY(R1),
  73             MinY(R2),
  74             R1->RegionRectangle,
  75             R2->RegionRectangle,
  76             &R3.RegionRectangle,
  77             &R3.bounds,
  78             GfxBase
  79         )
  80     )
  81     {
  82         ClearRegion(R2);
  83
  84         *R2 = R3;
  85
  86         _TranslateRegionRectangles(R3.RegionRectangle, -MinX(&R3), -MinY(&R3));
  87
  88         return TRUE;
  89     }
  90
  91     return FALSE;
  92
  93     AROS_LIBFUNC_EXIT
  94
  95 } /* ClearRegionRegion */