rom/graphics/andrectrect.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: (AROS only) Graphics function AndRectRect()
   6     Lang: english
   7 */
   8 #include <aros/debug.h>
   9 #include "graphics_intern.h"
  10 #include <graphics/regions.h>
  11 #include <clib/macros.h>
  12 #include "intregions.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <clib/graphics_protos.h>
  18
  19         AROS_LH3(BOOL, AndRectRect,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct Rectangle *, rect1, A0),
  23         AROS_LHA(struct Rectangle *, rect2, A1),
  24         AROS_LHA(struct Rectangle *, intersect, A2),
  25
  26 /*  LOCATION */
  27         struct GfxBase *, GfxBase, 193, Graphics)
  28
  29 /*  FUNCTION
  30         Calculate the intersection rectangle between the
  31         given Rectangle rect1 and the given Rectangle rect2
  32         leaving the result in intersect (if intersect != NULL).
  33
  34     INPUTS
  35         rect1 - pointer to 1st Rectangle
  36         rect2 - pointer to 2nd Rectangle
  37         intersect - pointer to rectangle which will hold result. May be NULL.
  38
  39     RESULT
  40         TRUE if rect1 and rect2 do intersect. In this case intersect (unless
  41         NULL) will contain the intersection rectangle.
  42
  43         FALSE if rect1 and rect2 do not overlap. "intersect" will
  44         then be left unchanged.
  45
  46     NOTES
  47         This function does not exist in AmigaOS.
  48
  49     EXAMPLE
  50
  51     BUGS
  52
  53     SEE ALSO
  54         AndRectRegion(), AndRegionRegion()
  55
  56     INTERNALS
  57
  58     HISTORY
  59         15-12-2000  stegerg implemented
  60
  61 *****************************************************************************/
  62 {
  63     AROS_LIBFUNC_INIT
  64
  65     ASSERT_VALID_PTR(rect1);
  66     ASSERT_VALID_PTR(rect2);
  67     ASSERT_VALID_PTR_OR_NULL(intersect);
  68
  69     if (IS_RECT_EVIL(rect1)) return FALSE;
  70     if (IS_RECT_EVIL(rect2)) return FALSE;
  71
  72     if (intersect)
  73         return _AndRectRect(rect1, rect2, intersect);
  74     else
  75         return overlap(*rect1, *rect2);
  76
  77     AROS_LIBFUNC_EXIT
  78
  79 } /* AndRectRect */