rom/graphics/finddisplayinfo.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function FindDisplayInfo()
   6     Lang: english
   7 */
   8 #include <aros/debug.h>
   9 #include <proto/graphics.h>
  10 #include <graphics/displayinfo.h>
  11 #include <hidd/graphics.h>
  12
  13 #include "graphics_intern.h"
  14 #include "dispinfo.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19 #include <proto/graphics.h>
  20
  21         AROS_LH1(DisplayInfoHandle, FindDisplayInfo,
  22
  23 /*  SYNOPSIS */
  24         AROS_LHA(ULONG, ID, D0),
  25
  26 /*  LOCATION */
  27         struct GfxBase *, GfxBase, 121, Graphics)
  28
  29 /*  FUNCTION
  30         Search for a DisplayInfo which matches the ID key.
  31
  32     INPUTS
  33         ID - identifier
  34
  35     RESULT
  36         handle - handle to a displayinfo record with that key
  37                  or NULL if no match
  38
  39     NOTES
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         graphics/displayinfo.h
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52
  53 ******************************************************************************/
  54 {
  55     AROS_LIBFUNC_INIT
  56
  57     struct monitor_driverdata *mdd;
  58     struct DisplayInfoHandle *ret = NULL;
  59     HIDDT_ModeID hiddmode;
  60
  61     D(bug("FindDisplayInfo(id=%x)\n", ID));
  62
  63     /* The database may fail on INVALID_ID, so handle this explicitly */
  64     if (ID == INVALID_ID)
  65         return NULL;
  66
  67     /* Find display driver data */
  68     for (mdd = CDD(GfxBase)->monitors; mdd; mdd = mdd->next) {
  69         if (mdd->id == (ID & mdd->mask))
  70             break;
  71     }
  72     if (!mdd)
  73         return NULL;
  74
  75     /* Calculate HIDD part of ModeID */
  76     hiddmode = ID & (~mdd->mask);
  77
  78     /* Go through all mode records of this driver */
  79     for (ret = mdd->modes; ret->id != vHidd_ModeID_Invalid; ret++) {
  80         if (ret->id == hiddmode)
  81             return ret;
  82     }
  83
  84     return NULL;
  85
  86     AROS_LIBFUNC_EXIT
  87 } /* FindDisplayInfo */