rom/graphics/initbitmap.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8
   9 #include <proto/graphics.h>
  10
  11 /*****************************************************************************
  12
  13     NAME */
  14
  15 #include <graphics/gfx.h>
  16
  17     AROS_LH4I(VOID, InitBitMap,
  18
  19 /*  SYNOPSIS */
  20
  21         AROS_LHA(struct BitMap *, bm,     A0),
  22         AROS_LHA(BYTE           , depth,  A1),
  23         AROS_LHA(UWORD          , width,  D0),
  24         AROS_LHA(UWORD          , height, D1),
  25
  26 /*  LOCATION */
  27
  28         struct Library *, GfxBase, 65, Graphics)
  29
  30 /*  FUNCTION
  31
  32     Initialize BitMap structure. A bitmap MUST be initialized before it's
  33     used in any (other) graphics library function.
  34
  35     INPUTS
  36
  37     bm     --  pointer to BitMap structure
  38     depth  --  number of bitplanes
  39     width  --  width in pixels of this bitmap
  40     height --  height in pixels of this bitmap
  41
  42     RESULT
  43
  44     NOTES
  45
  46     The Planes[] is not affected and must be set up the caller.
  47
  48     EXAMPLE
  49
  50     BUGS
  51
  52     SEE ALSO
  53
  54     <graphics/gfx.h>
  55
  56     INTERNALS
  57
  58     HISTORY
  59
  60 ******************************************************************************/
  61
  62 {
  63     AROS_LIBFUNC_INIT
  64
  65     bm->Depth = depth;
  66     bm->Rows  = height;
  67     bm->Flags = 0;
  68     bm->pad   = 0;
  69     bm->BytesPerRow = ((width + 15) >> 3) & ~0x1;
  70
  71     AROS_LIBFUNC_EXIT
  72 } /* InitBitMap */