text: /* $Xorg: DPMS.c,v 1.3 2000/08/17 19:45:50 cpqbld Exp $ */
  /*****************************************************************
  
  Copyright (c) 1996 Digital Equipment Corporation, Maynard, Massachusetts.
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software.
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING, 
  BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR OTHER LIABILITY, 
  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 
  IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of Digital Equipment Corporation 
  shall not be used in advertising or otherwise to promote the sale, use or other
  dealings in this Software without prior written authorization from Digital 
  Equipment Corporation.
  
  ******************************************************************/
  /* $XFree86: xc/lib/Xext/DPMS.c,v 3.5 2002/10/16 00:37:27 dawes Exp $ */
  
  /*
   * HISTORY
   */
  
  #define NEED_REPLIES
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/Xlibint.h>
  #include <X11/extensions/dpms.h>
  #include <X11/extensions/dpmsstr.h>
  #include <X11/extensions/Xext.h>
  #include <X11/extensions/extutil.h>
  #include <stdio.h>
  
  static XExtensionInfo _dpms_info_data;
  static XExtensionInfo *dpms_info = &_dpms_info_data;
  static char *dpms_extension_name = DPMSExtensionName;
  
  #define DPMSCheckExtension(dpy,i,val) \
    XextCheckExtension (dpy, i, dpms_extension_name, val)
  
  /*****************************************************************************
   *                                                                           *
   *                         private utility routines                          *
   *                                                                           *
   *****************************************************************************/
  
  static int close_display(Display *dpy, XExtCodes *codes);
  static /* const */ XExtensionHooks dpms_extension_hooks = {
      NULL,                               /* create_gc */
      NULL,                               /* copy_gc */
      NULL,                               /* flush_gc */
      NULL,                               /* free_gc */
      NULL,                               /* create_font */
      NULL,                               /* free_font */
      close_display,                      /* close_display */
      NULL,                               /* wire_to_event */
      NULL,                               /* event_to_wire */
      NULL,                               /* error */
      NULL                                /* error_string */
  };
  
  static XEXT_GENERATE_FIND_DISPLAY (find_display, dpms_info,
  				   dpms_extension_name,
                                     &dpms_extension_hooks, DPMSNumberEvents,
                                     NULL)
  
  static XEXT_GENERATE_CLOSE_DISPLAY (close_display, dpms_info)
                                                                
  /*****************************************************************************
   *                                                                           *
   *                  public routines                                          *
   *                                                                           *
   *****************************************************************************/
  
  Bool
  DPMSQueryExtension (Display *dpy, int *event_basep, int *error_basep)
  {
      XExtDisplayInfo *info = find_display (dpy);
  
      if (XextHasExtension(info)) {
  	*event_basep = info->codes->first_event;
  	*error_basep = info->codes->first_error;
  	return True;
      } else {
  	return False;
      }
  }
  
  Status
  DPMSGetVersion(Display *dpy, int *major_versionp, int *minor_versionp)
  {
      XExtDisplayInfo *info = find_display (dpy);
      xDPMSGetVersionReply	    rep;
      register xDPMSGetVersionReq  *req;
  
      DPMSCheckExtension (dpy, info, 0);
  
      LockDisplay (dpy);
      GetReq (DPMSGetVersion, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSGetVersion;
      if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
  	UnlockDisplay (dpy);
  	SyncHandle ();
  	return 0;
      }
      *major_versionp = rep.majorVersion;
      *minor_versionp = rep.minorVersion;
      UnlockDisplay (dpy);
      SyncHandle ();
      return 1;
  }
  
  Bool
  DPMSCapable(Display *dpy)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSCapableReq *req;
      xDPMSCapableReply rep;
  
      DPMSCheckExtension (dpy, info, 0);
  
      LockDisplay(dpy);
      GetReq(DPMSCapable, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSCapable;
  
      if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
  	UnlockDisplay(dpy);
  	SyncHandle();
  	return False;
      }
      UnlockDisplay(dpy);
      SyncHandle();
      return rep.capable;
  }
  
  Status
  DPMSSetTimeouts(Display *dpy, CARD16 standby, CARD16 suspend, CARD16 off)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSSetTimeoutsReq *req;
  
      if ((off != 0)&&(off < suspend)) 
      {
  	return BadValue;
      }
      if ((suspend != 0)&&(suspend < standby))
      {
  	return BadValue;
      }  
  
      DPMSCheckExtension (dpy, info, 0);
      LockDisplay(dpy);
      GetReq(DPMSSetTimeouts, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSSetTimeouts;
      req->standby = standby;
      req->suspend = suspend;
      req->off = off;
  
      UnlockDisplay(dpy);
      SyncHandle();
      return 1;
  }
  
  Bool
  DPMSGetTimeouts(Display *dpy, CARD16 *standby, CARD16 *suspend, CARD16 *off)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSGetTimeoutsReq *req;
      xDPMSGetTimeoutsReply rep;
  
      DPMSCheckExtension (dpy, info, 0);
  
      LockDisplay(dpy);
      GetReq(DPMSGetTimeouts, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSGetTimeouts;
  
      if (!_XReply(dpy, (xReply *)&rep, 0, xTrue)) {
  	UnlockDisplay(dpy);
  	SyncHandle();
  	return False;
      }
      UnlockDisplay(dpy);
      SyncHandle();
      *standby = rep.standby;
      *suspend = rep.suspend;
      *off = rep.off;
      return 1;
  }
  
  Status
  DPMSEnable(Display *dpy)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSEnableReq *req;
  
      DPMSCheckExtension (dpy, info, 0);
      LockDisplay(dpy);
      GetReq(DPMSEnable, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSEnable;
  
      UnlockDisplay(dpy);
      SyncHandle();
      return 1;
  }
  
  Status
  DPMSDisable(Display *dpy)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSDisableReq *req;
  
      DPMSCheckExtension (dpy, info, 0);
      LockDisplay(dpy);
      GetReq(DPMSDisable, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSDisable;
  
      UnlockDisplay(dpy);
      SyncHandle();
      return 1;
  }
  
  
  Status
  DPMSForceLevel(Display *dpy, CARD16 level)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSForceLevelReq *req;
  
      DPMSCheckExtension (dpy, info, 0);
  
      if ((level != DPMSModeOn) &&
  	(level != DPMSModeStandby) &&
  	(level != DPMSModeSuspend) &&
  	(level != DPMSModeOff))
  	return BadValue;
  
      LockDisplay(dpy);
      GetReq(DPMSForceLevel, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSForceLevel;
      req->level = level;
  
      UnlockDisplay(dpy);
      SyncHandle();
      return 1;
  }
  
  Status
  DPMSInfo(Display *dpy, CARD16 *power_level, BOOL *state)
  {
      XExtDisplayInfo *info = find_display (dpy);
      register xDPMSInfoReq *req;
      xDPMSInfoReply rep;
  
      DPMSCheckExtension (dpy, info, 0);
  
      LockDisplay(dpy);
      GetReq(DPMSInfo, req);
      req->reqType = info->codes->major_opcode;
      req->dpmsReqType = X_DPMSInfo;
  
      if (!_XReply(dpy, (xReply *)&rep, 0, xTrue)) {
  	UnlockDisplay(dpy);
  	SyncHandle();
  	return False;
      }
      UnlockDisplay(dpy);
      SyncHandle();
      *power_level = rep.power_level;
      *state = rep.state;
      return 1;
  }
  
  
  
  