rom/graphics/openmonitor.c

   1 /*
   2     Copyright © 1995-2010, 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 "graphics_intern.h"
  15 #include "dispinfo.h"
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <proto/graphics.h>
  21
  22         AROS_LH2(struct MonitorSpec *, OpenMonitor,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(STRPTR, monitor_name, A1),
  26         AROS_LHA(ULONG, display_id, D0),
  27
  28 /*  LOCATION */
  29         struct GfxBase *, GfxBase, 119, Graphics)
  30
  31 /*  FUNCTION
  32
  33     INPUTS
  34         monitor_name - pointer to a null terminated string
  35         display_id   - optional 32 bit monitor/mode identifier
  36
  37     RESULT
  38         mspc - pointer to an open MonitorSpec structure
  39                NULL if MonitorSpec could not be opened
  40
  41     NOTES
  42
  43     EXAMPLE
  44
  45     BUGS
  46
  47     SEE ALSO
  48         CloseMonitor(), graphics/monitor.h
  49
  50     INTERNALS
  51         Currently display_id parameter is ignored because all display modes
  52         are served by the same driver (which is the defailt one).
  53         In future this will change.
  54
  55     HISTORY
  56
  57
  58 ******************************************************************************/
  59 {
  60     AROS_LIBFUNC_INIT
  61
  62     struct MonitorSpec *mspc = NULL;
  63
  64     D(bug("[GFX] OpenMonitor(%s)\n", monitor_name));
  65
  66     if (monitor_name) {
  67         if (stricmp(monitor_name, DEFAULT_MONITOR_NAME)) {
  68             ObtainSemaphoreShared(GfxBase->MonitorListSemaphore);
  69
  70             /* TODO: use FindName() here, however this is possible only after switch to
  71                ABI v1 (because otherwise struct Node and struct ExtendedNode have different layout */
  72             for (mspc = (struct MonitorSpec *)GfxBase->MonitorList.lh_Head; mspc->ms_Node.xln_Succ; mspc = (struct MonitorSpec *)mspc->ms_Node.xln_Succ) {
  73                 if (!strcmp(monitor_name, mspc->ms_Node.xln_Name)) {
  74                     D(bug("[OpenMonitor] Found spec 0x%p\n", mspc));
  75                     break;
  76                 }
  77             }
  78
  79             ReleaseSemaphore(GfxBase->MonitorListSemaphore);
  80
  81             if (!mspc->ms_Node.xln_Succ) {
  82                 D(bug("[OpenMonitor] Monitor not found\n"));
  83                 return NULL;
  84             }
  85         } else
  86             mspc = GfxBase->default_monitor;
  87     } else if (display_id != INVALID_ID) {
  88         struct MonitorInfo info;
  89
  90         if (GetDisplayInfoData(NULL, (UBYTE *)&info, sizeof(info), DTAG_MNTR, display_id) >= offsetof(struct MonitorInfo, ViewPosition))
  91             mspc = info.Mspc;
  92     } else
  93         mspc = GfxBase->default_monitor;
  94
  95     if (mspc)
  96         AROS_ATOMIC_INC(mspc->ms_OpenCount);
  97
  98     return mspc;
  99
 100     AROS_LIBFUNC_EXIT
 101 } /* OpenMonitor */