rom/graphics/orregionregion.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function OrRegionRegion()
   6     Lang: english
   7 */
   8
   9 #include <graphics/regions.h>
  10
  11 #include "graphics_intern.h"
  12 #include "intregions.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <proto/graphics.h>
  18
  19         AROS_LH2(BOOL, OrRegionRegion,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct Region *, R1, A0),
  23         AROS_LHA(struct Region *, R2, A1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 102, Graphics)
  27
  28 /*  FUNCTION
  29         OR of one region with another region, leaving result in
  30         second region.
  31
  32     INPUTS
  33         region1 - pointer to a region structure
  34         region2 - pointer to a region structure
  35
  36     RESULT
  37         TRUE if the operation was successful, else FALSE
  38         (out of memory)
  39
  40     NOTES
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47         AndRegionRegion(), XOrRegionRegion()
  48
  49     INTERNALS
  50
  51     HISTORY
  52
  53 *****************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct Region R3;
  58
  59     if (!R1->RegionRectangle)
  60     {
  61         /* First region is empty, second left intact */
  62         return TRUE;
  63     }
  64
  65     if (!R2->RegionRectangle)
  66     {
  67         /* Second region was empty. Make a plain copy. */
  68         return _CopyRegionRectangles(R1, R2, GfxBase);
  69     }
  70
  71     /* Do the complete slow thing here */
  72     InitRegion(&R3);
  73
  74     if
  75     (
  76         _DoOperationBandBand
  77         (
  78             _OrBandBand,
  79             MinX(R1),
  80             MinX(R2),
  81             MinY(R1),
  82             MinY(R2),
  83             R1->RegionRectangle,
  84             R2->RegionRectangle,
  85             &R3.RegionRectangle,
  86             &R3.bounds,
  87             GfxBase
  88         )
  89     )
  90     {
  91         ClearRegion(R2);
  92
  93         *R2 = R3;
  94
  95         _TranslateRegionRectangles(R3.RegionRectangle, -MinX(&R3), -MinY(&R3));
  96
  97         return TRUE;
  98     }
  99
 100     return FALSE;
 101
 102     AROS_LIBFUNC_EXIT
 103 }