src/filters/BaseClasses/ddmm.cpp

   1 //------------------------------------------------------------------------------
   2 // File: DDMM.cpp
   3 //
   4 // Desc: DirectShow base classes - implements routines for using DirectDraw
   5 //       on a multimonitor system.
   6 //
   7 // Copyright (c) 1995-2002 Microsoft Corporation.  All rights reserved.
   8 //------------------------------------------------------------------------------
   9
  10
  11 #include <streams.h>
  12 #include <ddraw.h>
  13 #include "ddmm.h"
  14
  15 /*
  16  * FindDeviceCallback
  17  */
  18 typedef struct {
  19         LPSTR   szDevice;
  20         GUID*   lpGUID;
  21         GUID    GUID;
  22         BOOL    fFound;
  23 }   FindDeviceData;
  24
  25 BOOL CALLBACK FindDeviceCallback(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam)
  26 {
  27         FindDeviceData *p = (FindDeviceData*)lParam;
  28
  29         if (lstrcmpiA(p->szDevice, szDevice) == 0) {
  30             if (lpGUID) {
  31                 p->GUID = *lpGUID;
  32                 p->lpGUID = &p->GUID;
  33             } else {
  34                 p->lpGUID = NULL;
  35             }
  36             p->fFound = TRUE;
  37             return FALSE;
  38         }
  39         return TRUE;
  40 }
  41
  42
  43 BOOL CALLBACK FindDeviceCallbackEx(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam, HMONITOR hMonitor)
  44 {
  45         FindDeviceData *p = (FindDeviceData*)lParam;
  46
  47         if (lstrcmpiA(p->szDevice, szDevice) == 0) {
  48             if (lpGUID) {
  49                 p->GUID = *lpGUID;
  50                 p->lpGUID = &p->GUID;
  51             } else {
  52                 p->lpGUID = NULL;
  53             }
  54             p->fFound = TRUE;
  55             return FALSE;
  56         }
  57         return TRUE;
  58 }
  59
  60
  61 /*
  62  * DirectDrawCreateFromDevice
  63  *
  64  * create a DirectDraw object for a particular device
  65  */
  66 IDirectDraw * DirectDrawCreateFromDevice(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, PDRAWENUM DirectDrawEnumerateP)
  67 {
  68         IDirectDraw*    pdd = NULL;
  69         FindDeviceData  find;
  70
  71         if (szDevice == NULL) {
  72                 DirectDrawCreateP(NULL, &pdd, NULL);
  73                 return pdd;
  74         }
  75
  76         find.szDevice = szDevice;
  77         find.fFound   = FALSE;
  78         DirectDrawEnumerateP(FindDeviceCallback, (LPVOID)&find);
  79
  80         if (find.fFound)
  81         {
  82                 //
  83                 // In 4bpp mode the following DDraw call causes a message box to be popped
  84                 // up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we
  85                 // make sure it doesn't happen.
  86                 //
  87                 UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
  88                 DirectDrawCreateP(find.lpGUID, &pdd, NULL);
  89                 SetErrorMode(ErrorMode);
  90         }
  91
  92         return pdd;
  93 }
  94
  95
  96 /*
  97  * DirectDrawCreateFromDeviceEx
  98  *
  99  * create a DirectDraw object for a particular device
 100  */
 101 IDirectDraw * DirectDrawCreateFromDeviceEx(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, LPDIRECTDRAWENUMERATEEXA DirectDrawEnumerateExP)
 102 {
 103         IDirectDraw*    pdd = NULL;
 104         FindDeviceData  find;
 105
 106         if (szDevice == NULL) {
 107                 DirectDrawCreateP(NULL, &pdd, NULL);
 108                 return pdd;
 109         }
 110
 111         find.szDevice = szDevice;
 112         find.fFound   = FALSE;
 113         DirectDrawEnumerateExP(FindDeviceCallbackEx, (LPVOID)&find,
 114                                         DDENUM_ATTACHEDSECONDARYDEVICES);
 115
 116         if (find.fFound)
 117         {
 118                 //
 119                 // In 4bpp mode the following DDraw call causes a message box to be popped
 120                 // up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we
 121                 // make sure it doesn't happen.
 122                 //
 123                 UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
 124                 DirectDrawCreateP(find.lpGUID, &pdd, NULL);
 125                 SetErrorMode(ErrorMode);
 126         }
 127
 128         return pdd;
 129 }