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//------------------------------------------------------------------------------
// File: DDMM.cpp
//
// Desc: DirectShow base classes - implements routines for using DirectDraw
// on a multimonitor system.
//
// Copyright (c) 1995-2001 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(__in_opt GUID* lpGUID, __in LPSTR szName, __in LPSTR szDevice, __in 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(__in_opt GUID* lpGUID, __in LPSTR szName, __in LPSTR szDevice, __in 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(__in_opt 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(__in_opt 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;
}