//------------------------------------------------------------------------------
  // File: DDMM.cpp
  //
  // Desc: DirectShow base classes - implements routines for using DirectDraw
  //       on a multimonitor system.
  //
  // Copyright (c)  Microsoft Corporation.  All rights reserved.
  //------------------------------------------------------------------------------
  
  include <streams.h>
  include <ddraw.h>
  include <ddmm.h>
  
  /*
   * FindDeviceCallback
   */
  typedef struct {
          LPSTR   szDevice;
          GUID*   lpGUID;
          GUID    GUID;
          BOOL    fFound;
  }   FindDeviceData;
  
  BOOL CALLBACK FindDeviceCallback(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam)
  {
          FindDeviceData *p = (FindDeviceData*)lParam;
  
          if (lstrcmpiA(p->szDevice, szDevice) == 0) {
              if (lpGUID) {
                  p->GUID = *lpGUID;
                  p->lpGUID = &p->GUID;
              } else {
                  p->lpGUID = NULL;
              }
              p->fFound = TRUE;
              return FALSE;
          }
          return TRUE;
  }
  
  BOOL CALLBACK FindDeviceCallbackEx(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam, HMONITOR hMonitor)
  {
          FindDeviceData *p = (FindDeviceData*)lParam;
  
          if (lstrcmpiA(p->szDevice, szDevice) == 0) {
              if (lpGUID) {
                  p->GUID = *lpGUID;
                  p->lpGUID = &p->GUID;
              } else {
                  p->lpGUID = NULL;
              }
              p->fFound = TRUE;
              return FALSE;
          }
          return TRUE;
  }
  
  /*
   * DirectDrawCreateFromDevice
   *
   * create a DirectDraw object for a particular device
   */
  IDirectDraw * DirectDrawCreateFromDevice(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, PDRAWENUM DirectDrawEnumerateP)
  {
          IDirectDraw*    pdd = NULL;
          FindDeviceData  find;
  
          if (szDevice == NULL) {
                  DirectDrawCreateP(NULL, &pdd, NULL);
                  return pdd;
          }
  
          find.szDevice = szDevice;
          find.fFound   = FALSE;
          DirectDrawEnumerateP(FindDeviceCallback, (LPVOID)&find);
  
          if (find.fFound)
          {
                  //
                  // In 4bpp mode the following DDraw call causes a message box to be popped
                  // up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we
                  // make sure it doesn't happen.
                  //
                  UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
                  DirectDrawCreateP(find.lpGUID, &pdd, NULL);
                  SetErrorMode(ErrorMode);
          }
  
          return pdd;
  }
  
  /*
   * DirectDrawCreateFromDeviceEx
   *
   * create a DirectDraw object for a particular device
   */
  IDirectDraw * DirectDrawCreateFromDeviceEx(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, LPDIRECTDRAWENUMERATEEXA DirectDrawEnumerateExP)
  {
          IDirectDraw*    pdd = NULL;
          FindDeviceData  find;
  
          if (szDevice == NULL) {
                  DirectDrawCreateP(NULL, &pdd, NULL);
                  return pdd;
          }
  
          find.szDevice = szDevice;
          find.fFound   = FALSE;
          DirectDrawEnumerateExP(FindDeviceCallbackEx, (LPVOID)&find,
                                          DDENUM_ATTACHEDSECONDARYDEVICES);
  
          if (find.fFound)
          {
                  //
                  // In 4bpp mode the following DDraw call causes a message box to be popped
                  // up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we
                  // make sure it doesn't happen.
                  //
                  UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
                  DirectDrawCreateP(find.lpGUID, &pdd, NULL);
                  SetErrorMode(ErrorMode);
          }
  
          return pdd;
  }