rom/graphics/openmonitor.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function OpenMonitor()
   6     Lang: english
   7 */
   8
   9 #include <aros/atomic.h>
  10 #include <aros/debug.h>
  11 #include <graphics/monitor.h>
  12 #include <proto/oop.h>
  13
  14 #include <stddef.h>
  15
  16 #include "graphics_intern.h"
  17 #include "dispinfo.h"
  18
  19 /*****************************************************************************
  20
  21     NAME */
  22 #include <proto/graphics.h>
  23
  24         AROS_LH2(struct MonitorSpec *, OpenMonitor,
  25
  26 /*  SYNOPSIS */
  27         AROS_LHA(STRPTR, monitor_name, A1),
  28         AROS_LHA(ULONG, display_id, D0),
  29
  30 /*  LOCATION */
  31         struct GfxBase *, GfxBase, 119, Graphics)
  32
  33 /*  FUNCTION
  34
  35     INPUTS
  36         monitor_name - pointer to a null terminated string
  37         display_id   - optional 32 bit monitor/mode identifier
  38
  39     RESULT
  40         mspc - pointer to an open MonitorSpec structure
  41                NULL if MonitorSpec could not be opened
  42
  43     NOTES
  44
  45     EXAMPLE
  46
  47     BUGS
  48
  49     SEE ALSO
  50         CloseMonitor(), graphics/monitor.h
  51
  52     INTERNALS
  53
  54     HISTORY
  55
  56
  57 ******************************************************************************/
  58 {
  59     AROS_LIBFUNC_INIT
  60
  61     struct MonitorSpec *mspc = NULL;
  62
  63     D(bug("[GFX] OpenMonitor(%s)\n", monitor_name));
  64
  65     if (monitor_name)
  66     {
  67         if (stricmp(monitor_name, DEFAULT_MONITOR_NAME))
  68         {
  69             ObtainSemaphoreShared(GfxBase->MonitorListSemaphore);
  70
  71             mspc = (struct MonitorSpec *)FindName(&GfxBase->MonitorList, monitor_name);
  72             D(bug("[OpenMonitor] Found spec 0x%p\n", mspc));
  73
  74             ReleaseSemaphore(GfxBase->MonitorListSemaphore);
  75         }
  76         else
  77             mspc = GfxBase->default_monitor;
  78     }
  79     else if (display_id != INVALID_ID)
  80     {
  81         struct MonitorInfo info;
  82
  83         if (GetDisplayInfoData(NULL, (UBYTE *)&info, sizeof(info), DTAG_MNTR, display_id) >= offsetof(struct MonitorInfo, ViewPosition))
  84             mspc = info.Mspc;
  85     }
  86     else
  87         mspc = GfxBase->default_monitor;
  88
  89     if (mspc)
  90         AROS_ATOMIC_INC(mspc->ms_OpenCount);
  91
  92     return mspc;
  93
  94     AROS_LIBFUNC_EXIT
  95 } /* OpenMonitor */