rom/graphics/allocscreenbitmap.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Private graphics function for allocating screen bitmaps
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9 #include <exec/memory.h>
  10 #include <graphics/rastport.h>
  11 #include <proto/exec.h>
  12 #include <proto/oop.h>
  13 #include <oop/oop.h>
  14 #include "gfxfuncsupport.h"
  15 #include "dispinfo.h"
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <graphics/rastport.h>
  21 #include <proto/graphics.h>
  22
  23         AROS_LH1(struct BitMap * , AllocScreenBitMap,
  24
  25 /*  SYNOPSIS */
  26         AROS_LHA(ULONG, modeid, D0),
  27
  28 /*  LOCATION */
  29         struct GfxBase *, GfxBase, 182, Graphics)
  30
  31 /*  FUNCTION
  32         Allocates a bitmap for use with a screen opened by OpenScreen()
  33
  34     INPUTS
  35         modeid - the DisplayID of the screen to create
  36
  37     RESULT
  38         bitmap - pointer to the newly created bitmap.
  39
  40     NOTES
  41         This function is private and AROS specific.
  42
  43     EXAMPLE
  44
  45     BUGS
  46
  47     SEE ALSO
  48
  49     INTERNALS
  50
  51     HISTORY
  52
  53 *****************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct BitMap   *nbm = NULL;
  58     HIDDT_ModeID    hiddmode;
  59
  60     /* First get the the gfxmode for this modeid */
  61     hiddmode = get_hiddmode_for_amigamodeid(modeid, GfxBase);
  62
  63     if (vHidd_ModeID_Invalid != hiddmode)
  64     {
  65         /* Create the bitmap from the hidd mode */
  66         OOP_Object *sync, *pf;
  67
  68         if (HIDD_Gfx_GetMode(SDD(GfxBase)->gfxhidd, hiddmode, &sync, &pf))
  69         {
  70             IPTR width, height, depth;
  71
  72             OOP_GetAttr(sync, aHidd_Sync_HDisp, &width);
  73             OOP_GetAttr(sync, aHidd_Sync_VDisp, &height);
  74             OOP_GetAttr(pf,   aHidd_PixFmt_Depth,       &depth);
  75
  76             /* Hack: a negative depth indicates to AllocBitMap, that
  77                the friend bitmap param actually is the hiddmode */
  78
  79             nbm = AllocBitMap(width, height, -((LONG)depth), HIDD_BMF_SCREEN_BITMAP | BMF_DISPLAYABLE, (struct BitMap *)hiddmode);
  80         }
  81     }
  82
  83     return nbm;
  84
  85     AROS_LIBFUNC_EXIT
  86
  87 } /* AllocScreenBitMap */