/// <summary>
/// Make sure we load penimc.dll from WPF's installed location to avoid two instances of it.
/// </summary>
static UnsafeNativeMethods()
{
// Register PenIMC for SxS COM for the lifetime of the process. No need to store the
// cookie; PenIMC's ActivationContext will never be removed from the ActivationContext
// stack.
//
// RegisterDllForSxSCOM returns a non-zero ActivationContextCookie if SxS registration
// succeeds, or IntPtr.Zero if SxS registration fails.
if (IntPtr.Zero == RegisterDllForSxSCOM())
{
throw new InvalidOperationException(SR.Get(SRID.PenImcSxSRegistrationFailed, ExternDll.Penimc));
}
// Ensure PenIMC loaded from the correct location.
var uncheckedDlls = WpfDllVerifier.VerifyWpfDllSet(ExternDll.Penimc);
if (uncheckedDlls.Contains(ExternDll.Penimc))
{
throw new DllNotFoundException(SR.Get(SRID.PenImcDllVerificationFailed, ExternDll.Penimc));
}
}
/// <summary>
/// Make sure we load penimc.dll from WPF's installed location to avoid two instances of it.
///
/// Add an activation context to the thread's stack to ensure the registration-free COM objects
/// are available.
/// </summary>
/// <remarks>
/// PenIMC COM objects are only directly used (functions called on their interfaces) from inside the
/// PenThread. As such, the PenThreads need to create the activation context. The various Dispatcher
/// threads need not do so as they merely pass the RCWs around in manged objects and will only use
/// them via operations queued on their associated PenThread.
/// </remarks>
internal static void EnsurePenImcClassesActivated()
{
if (_pimcActCtxCookie == IntPtr.Zero)
{
// Register PenIMC for SxS COM for the lifetime of the thread.
//
// RegisterDllForSxSCOM returns a non-zero ActivationContextCookie if SxS registration
// succeeds, or IntPtr.Zero if SxS registration fails.
if ((_pimcActCtxCookie = RegisterDllForSxSCOM()) == IntPtr.Zero)
{
throw new InvalidOperationException(SR.Get(SRID.PenImcSxSRegistrationFailed, ExternDll.Penimc));
}
// Ensure PenIMC loaded from the correct location.
var uncheckedDlls = WpfDllVerifier.VerifyWpfDllSet(ExternDll.Penimc);
if (uncheckedDlls.Contains(ExternDll.Penimc))
{
throw new DllNotFoundException(SR.Get(SRID.PenImcDllVerificationFailed, ExternDll.Penimc));
}
}
}
//+---------------------------------------------------------------------
//
// Internal Methods
//
//----------------------------------------------------------------------
#region Internal Methods
/// <summary>
/// Sets the owner MediaContext and creates the notification window.
/// </summary>
internal MediaContextNotificationWindow(MediaContext ownerMediaContext)
{
// Remember the pointer to the owner MediaContext that we'll forward the broadcasts to.
_ownerMediaContext = ownerMediaContext;
// Create a top-level, invisible window so we can get the WM_DWMCOMPOSITIONCHANGED
// and other DWM notifications that are broadcasted to top-level windows only.
HwndWrapper hwndNotification;
hwndNotification = new HwndWrapper(0, NativeMethods.WS_POPUP, 0, 0, 0, 0, 0, "MediaContextNotificationWindow", IntPtr.Zero, null);
_hwndNotificationHook = new HwndWrapperHook(MessageFilter);
_hwndNotification = new SecurityCriticalDataClass <HwndWrapper>(hwndNotification);
_hwndNotification.Value.AddHook(_hwndNotificationHook);
_isDisposed = false;
//
// On Vista, we need to know when the Magnifier goes on and off
// in order to switch to and from software rendering because the
// Vista Magnifier cannot magnify D3D content. To receive the
// window message informing us of this, we must tell the DWM
// we are MIL content.
//
// The Win7 Magnifier can magnify D3D content so it's not an
// issue there. In fact, Win7 doesn't even send the WM.
//
// If the DWM is not running, this call will result in NoOp.
//
ChangeWindowMessageFilter(s_dwmRedirectionEnvironmentChanged, 1 /* MSGFLT_ADD */);
MS.Internal.HRESULT.Check(MilContent_AttachToHwnd(_hwndNotification.Value.Handle));
WpfDllVerifier.VerifyWpfDllSet();
}
