rom/graphics/getbitmapattr.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Get an attribute from a bitmap.
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include "gfxfuncsupport.h"
  10 #include <graphics/rastport.h>
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <exec/types.h>
  16 #include <graphics/gfx.h>
  17 #include <proto/graphics.h>
  18
  19         AROS_LH2(IPTR, GetBitMapAttr,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct BitMap *, bitmap, A0),
  23         AROS_LHA(ULONG          , attribute, D1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 160, Graphics)
  27
  28 /*  FUNCTION
  29         Returns a specific information about a bitmap. Do not access the
  30         bitmap directly!
  31
  32     INPUTS
  33         bitmap - The BitMap structure to get information about.
  34         attribute - Number of the attribute to get. See <graphics/gfx.h> for
  35                     possible values.
  36
  37     RESULT
  38         The information you requested. If you asked for an unknown attribute,
  39         0 or NULL is returned.
  40
  41     NOTES
  42
  43     EXAMPLE
  44
  45     BUGS
  46
  47     SEE ALSO
  48         AllocBitMap()
  49
  50     INTERNALS
  51
  52     HISTORY
  53         29-10-95    digulla automatically created from
  54                             graphics_lib.fd and clib/graphics_protos.h
  55
  56 *****************************************************************************/
  57 {
  58     AROS_LIBFUNC_INIT
  59
  60     IPTR retval;
  61
  62     switch(attribute)
  63     {
  64         case BMA_HEIGHT:
  65             retval = (IPTR)bitmap->Rows;
  66             break;
  67
  68         case BMA_WIDTH:
  69           /* must return width in pixel! */
  70             retval = (IPTR)(bitmap->BytesPerRow * 8);
  71             break;
  72
  73         case BMA_DEPTH:
  74             if (IS_HIDD_BM(bitmap))
  75             {
  76                 retval = (IPTR)HIDD_BM_REALDEPTH(bitmap);
  77             }
  78             else
  79             {
  80                 retval = (IPTR)bitmap->Depth;
  81             }
  82             break;
  83
  84         case BMA_FLAGS:
  85             retval = (IPTR)(bitmap->Flags & (BMF_DISPLAYABLE |
  86                                              BMF_INTERLEAVED |
  87                                              BMF_STANDARD));
  88             break;
  89
  90         default:
  91             retval = 0;
  92             break;
  93     }
  94
  95     return retval;
  96
  97     AROS_LIBFUNC_EXIT
  98
  99 } /* GetBitMapAttr */