workbench/libs/muimaster/mui_addclipping.c

   1 /*
   2     Copyright © 2002-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <proto/graphics.h>
   7 #include <proto/layers.h>
   8 #include <proto/muimaster.h>
   9
  10 #include "support.h"
  11
  12 #include "mui.h"
  13 #include "muimaster_intern.h"
  14
  15 /*****************************************************************************
  16
  17     NAME */
  18         AROS_LH5(APTR, MUI_AddClipping,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct MUI_RenderInfo *, mri, A0),
  22         AROS_LHA(WORD, left, D0),
  23         AROS_LHA(WORD, top, D1),
  24         AROS_LHA(WORD, width, D2),
  25         AROS_LHA(WORD, height, D3),
  26
  27 /*  LOCATION */
  28         struct Library *, MUIMasterBase, 24, MUIMaster)
  29
  30 /*  FUNCTION
  31
  32     INPUTS
  33
  34     RESULT
  35
  36     NOTES
  37
  38     EXAMPLE
  39
  40     BUGS
  41
  42     SEE ALSO
  43
  44     INTERNALS
  45
  46     HISTORY
  47
  48 *****************************************************************************/
  49 {
  50     AROS_LIBFUNC_INIT
  51
  52     struct Region       *r;
  53     struct Rectangle     rect;
  54     APTR                 handle;
  55
  56     if ((width >= MUI_MAXMAX) || (height >= MUI_MAXMAX))
  57         return (APTR)-1;
  58
  59     if (mri->mri_rCount > 0)
  60     {
  61         if (isRegionWithinBounds(mri->mri_rArray[mri->mri_rCount-1], left, top, width, height))
  62             return (APTR)-1;
  63     }
  64
  65     if ((r = NewRegion()) == NULL)
  66         return (APTR)-1;
  67
  68     rect.MinX = left;
  69     rect.MinY = top;
  70     rect.MaxX = left + width  - 1;
  71     rect.MaxY = top  + height - 1;
  72     OrRectRegion(r, &rect);
  73
  74     handle = MUI_AddClipRegion(mri, r);
  75
  76 #if 0 /* MUI_AddClipRegion frees region itself upon failure */
  77     if (handle == (APTR)-1)
  78     {
  79         DisposeRegion(r);
  80     }
  81 #endif
  82     return handle;
  83
  84     AROS_LIBFUNC_EXIT
  85
  86 } /* MUIA_AddClipping */