rom/graphics/getbitmapattr.c

   1 /*
   2     Copyright © 1995-2001, 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     AROS_LIBBASE_EXT_DECL(struct GfxBase *,GfxBase)
  60
  61     IPTR retval;
  62
  63     switch(attribute)
  64     {
  65         case BMA_HEIGHT:
  66             retval = (IPTR)bitmap->Rows;
  67             break;
  68
  69         case BMA_WIDTH:
  70           /* must return width in pixel! */
  71             retval = (IPTR)(bitmap->BytesPerRow * 8);
  72             break;
  73
  74         case BMA_DEPTH:
  75             if (IS_HIDD_BM(bitmap))
  76             {
  77                 retval = (IPTR)HIDD_BM_REALDEPTH(bitmap);
  78             }
  79             else
  80             {
  81                 retval = (IPTR)bitmap->Depth;
  82             }
  83             break;
  84
  85         case BMA_FLAGS:
  86             retval = (IPTR)(bitmap->Flags & (BMF_DISPLAYABLE |
  87                                              BMF_INTERLEAVED |
  88                                              BMF_STANDARD));
  89             break;
  90
  91         default:
  92             retval = 0;
  93             break;
  94     }
  95
  96     return retval;
  97
  98     AROS_LIBFUNC_EXIT
  99
 100 } /* GetBitMapAttr */