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, 28, 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 *****************************************************************************/
  47 {
  48     AROS_LIBFUNC_INIT
  49
  50     struct Region *r;
  51     struct Rectangle rect;
  52     APTR handle;
  53
  54     if ((width >= MUI_MAXMAX) || (height >= MUI_MAXMAX))
  55         return (APTR)-1;
  56
  57     if (mri->mri_rCount > 0)
  58     {
  59         if (isRegionWithinBounds(mri->mri_rArray[mri->mri_rCount-1],
  60             left, top, width, height))
  61             return (APTR)-1;
  62     }
  63
  64     if ((r = NewRegion()) == NULL)
  65         return (APTR)-1;
  66
  67     rect.MinX = left;
  68     rect.MinY = top;
  69     rect.MaxX = left + width  - 1;
  70     rect.MaxY = top  + height - 1;
  71     OrRectRegion(r, &rect);
  72
  73     handle = MUI_AddClipRegion(mri, r);
  74
  75 #if 0 /* MUI_AddClipRegion frees region itself upon failure */
  76     if (handle == (APTR)-1)
  77     {
  78         DisposeRegion(r);
  79     }
  80 #endif
  81     return handle;
  82
  83     AROS_LIBFUNC_EXIT
  84
  85 } /* MUIA_AddClipping */