Прозрачный логотип bmp

BOOL CALLBACK SplashDialogProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    return 0;
}
static HWND hWndSplash = NULL;
void InitSplash( const TCHAR* Filename )
{
    guard(InitSplash);
    
    HBITMAP hBitmap    = NULL;
    INT     BitmapX    = 0;
    INT     BitmapY    = 0;
 
    FWindowsBitmap Bitmap(1);
 
    if( Filename )
    {
        verify(Bitmap.LoadFile(Filename) );
        hBitmap = Bitmap.GetBitmapHandle();
        BitmapX = Bitmap.SizeX;
        BitmapY = Bitmap.SizeY;
    }
    hWndSplash = TCHAR_CALL_OS(CreateDialogW(hInstance,MAKEINTRESOURCEW(IDDIALOG_Splash), NULL, SplashDialogProc),CreateDialogA(hInstance, MAKEINTRESOURCEA(IDDIALOG_Splash), NULL, SplashDialogProc) );
    if( hWndSplash )
    {
        HWND hWndLogo = GetDlgItem(hWndSplash,IDC_Logo);
        if( hWndLogo )
        {
            SetWindowPos(hWndSplash,HWND_TOPMOST,(GetSystemMetrics(SM_CXSCREEN)-BitmapX)/2,(GetSystemMetrics(SM_CYSCREEN)-BitmapY)/2,BitmapX,BitmapY,SWP_SHOWWINDOW);
            SetWindowPos(hWndSplash,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
            SendMessageX( hWndLogo, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hBitmap );
            UpdateWindow( hWndSplash );
        }
    }
    unguard;
}
void ExitSplash()
{
    guard(ExitSplash);
    DestroyWindow( hWndSplash );
    unguard;
}

SetWindowLong(hWndSplash, GWL_EXSTYLE, GetWindowLong(hWndSplash, GWL_EXSTYLE) | WS_EX_LAYERED);
SetLayeredWindowAttributes(hWndSplash, RGB(0, 0, 0), 255, LWA_COLORKEY);
// SetWindowPos(hWndSplash, HWND_TOP, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER);

#ifndef WS_EX_LAYERED
#define WS_EX_LAYERED 0x00080000
#endif
#ifndef LWA_COLORKEY
#define LWA_COLORKEY 0x00000001
#endif
typedef BOOL (WINAPI *lpfnSetLayeredWindowAttributes)(
HWND hwnd,
COLORREF crKey,
BYTE bAlpha,
DWORD dwFlags
);
lpfnSetLayeredWindowAttributes SetLayeredWindowAttributes
HMODULE hUser32 = GetModuleHandle(_T("USER32.DLL"));
SetLayeredWindowAttributes = NULL;
SetLayeredWindowAttributes = (lpfnSetLayeredWindowAttributes)GetProcAddress(hUser32, "SetLayeredWindowAttributes");