rom/graphics/freebitmap.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Free the memory occupied by a BitMap.
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <exec/memory.h>
  11 #include <proto/exec.h>
  12
  13 #include "graphics_intern.h"
  14 #include "gfxfuncsupport.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19 #include <graphics/gfx.h>
  20 #include <proto/graphics.h>
  21
  22         AROS_LH1(void, FreeBitMap,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(struct BitMap *, bm, A0),
  26
  27 /*  LOCATION */
  28         struct GfxBase *, GfxBase, 154, Graphics)
  29
  30 /*  FUNCTION
  31         Returns the memory occupied by the BitMap to the system.
  32
  33     INPUTS
  34         bm - The result of AllocBitMap(). Must be non-NULL.
  35
  36     RESULT
  37         None.
  38
  39     NOTES
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         AllocBitMap(), AllocRaster(), FreeRaster()
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52 *****************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     if (!bm) return;
  57
  58     ASSERT_VALID_PTR(bm);
  59
  60     if (bm->pad != 0 || (bm->Flags & BMF_SPECIALFMT))
  61     {
  62         OOP_Object *bmobj = HIDD_BM_OBJ(bm);
  63
  64         if (HIDD_BM_FLAGS(bm) & HIDD_BMF_SHARED_PIXTAB)
  65         {
  66             /* NULL colormap otherwise bitmap killing also kills
  67                the colormap object of the bitmap object
  68                from which we shared it = to which it belongs */
  69             if (bmobj)
  70                 HIDD_BM_SetColorMap(bmobj, NULL);
  71         }
  72         else if (HIDD_BM_FLAGS(bm) & HIDD_BMF_SCREEN_BITMAP) // (bm->Flags & BMF_DISPLAYABLE)
  73         {
  74             FreeVec(HIDD_BM_PIXTAB(bm));
  75         }
  76
  77         if (bmobj)
  78             HIDD_Gfx_DisposeBitMap(HIDD_BM_DRVDATA(bm)->gfxhidd, bmobj);
  79
  80         FreeMem(bm, sizeof (struct BitMap));
  81     }
  82     else
  83     {
  84         ULONG plane;
  85         ULONG width;
  86
  87         width = bm->BytesPerRow * 8;
  88
  89         for (plane=0; plane < bm->Depth; plane ++)
  90         {
  91             /* Take care of two special cases: plane pointers containing NULL or -1
  92              * are supported by BltBitMap() as all 0's and all 1's planes
  93              */
  94             if (bm->Planes[plane] && bm->Planes[plane] != (PLANEPTR)-1)
  95             {
  96                 ASSERT_VALID_PTR(bm->Planes[plane]);
  97                 FreeRaster (bm->Planes[plane], width, bm->Rows);
  98             }
  99         }
 100
 101         FreeMem (bm, sizeof(struct BitMap) +
 102                      ((bm->Depth > 8) ? (bm->Depth - 8) * sizeof(PLANEPTR) : 0));
 103     }
 104
 105     AROS_LIBFUNC_EXIT
 106 } /* FreeBitMap */