rom/graphics/nextdisplayinfo.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function NextDisplayInfo()
   6     Lang: english
   7 */
   8 #include <graphics/displayinfo.h>
   9 #include <hidd/gfx.h>
  10 #include <proto/oop.h>
  11 #include "graphics_intern.h"
  12 #include "dispinfo.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <proto/graphics.h>
  18
  19         AROS_LH1(ULONG, NextDisplayInfo,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(ULONG, last_ID, D0),
  23
  24 /*  LOCATION */
  25         struct GfxBase *, GfxBase, 122, Graphics)
  26
  27 /*  FUNCTION
  28         Go to next entry in the DisplayInfo database.
  29
  30     INPUTS
  31         last_ID - previous displayinfo identifier
  32                   or INVALID_ID if beginning iteration
  33
  34     RESULT
  35         next_ID - subsequent displayinfo identifier
  36                   or INVALID_ID if no more records
  37
  38     NOTES
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45         FindDisplayInfo(), GetDisplayInfoData(), graphics/displayinfo.h
  46
  47     INTERNALS
  48
  49     HISTORY
  50
  51
  52 ******************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     struct monitor_driverdata *mdd = NULL;
  57     struct DisplayInfoHandle *dh = NULL;
  58
  59     if (last_ID == INVALID_ID)
  60         /* Start from the beginning */
  61         mdd = CDD(GfxBase)->monitors;
  62     else {
  63         /* Find handle and driver of current mode */
  64         dh = FindDisplayInfo(last_ID);
  65         if (dh)
  66             mdd = dh->drv;
  67     }
  68
  69     while (mdd) {
  70         /* Take next (or first) mode handle */
  71         if (dh)
  72             dh++;
  73         else
  74             dh = mdd->modes;
  75
  76         /* If it's not the last handle, return it */
  77         if (dh->id != vHidd_ModeID_Invalid)
  78             return dh->drv->id | dh->id;
  79
  80         /* Next driver, first handle */
  81         mdd = mdd->next;
  82         dh = NULL;
  83     }
  84
  85     return INVALID_ID;
  86
  87     AROS_LIBFUNC_EXIT
  88 } /* NextDisplayInfo */