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));
}
public static bool Startup(MediaContext mc)
{
//
// Note to stress triagers:
//
// This call will fail if PresentationCore.dll and milcore.dll have mismatched
// versions -- please make sure that both binaries have been properly built
// and deployed.
//
// *** Failure here does NOT indicate a bug in MediaContext.Startup! ***
//
HRESULT.Check(UnsafeNativeMethods.MilVersionCheck(MS.Internal.Composition.Version.MilSdkVersion));
using (CompositionEngineLock.Acquire())
{
_mediaContexts.Add(mc);
//Is this the first startup?
if (0 == s_refCount)
{
HRESULT.Check(SafeNativeMethods.MilCompositionEngine_InitializePartitionManager(
0 // THREAD_PRIORITY_NORMAL
));
s_forceSoftareForGraphicsStreamMagnifier =
UnsafeNativeMethods.WgxConnection_ShouldForceSoftwareForGraphicsStreamClient();
ConnectTransport();
// Read a flag from the registry to determine whether we should run
// animation smoothing code.
ReadAnimationSmoothingSetting();
}
s_refCount++;
}
//
return true;
}
internal static bool ConnectChannels(MediaContext mc)
{
bool fCreated = false;
using (CompositionEngineLock.Acquire())
{
if (IsTransportConnected)
{
mc.CreateChannels();
fCreated = true;
}
}
return fCreated;
}
internal static void Shutdown(MediaContext mc)
{
using (CompositionEngineLock.Acquire())
{
Debug.Assert(s_refCount > 0);
_mediaContexts.Remove(mc);
s_refCount--;
if (0 == s_refCount)
{
// We can shut-down.
// Debug.WriteLine("MediSystem::NotifyDisconnect Stop Transport\n");
if (IsTransportConnected)
{
DisconnectTransport();
}
HRESULT.Check(SafeNativeMethods.MilCompositionEngine_DeinitializePartitionManager());
}
}
}
/// <summary>
/// Gets the MediaContext from the context passed in as argument.
/// </summary>
internal static MediaContext From(Dispatcher dispatcher)
{
Debug.Assert(dispatcher != null, "Dispatcher required");
MediaContext cm = (MediaContext)dispatcher.Reserved0;
if (cm == null)
{
cm = new MediaContext(dispatcher);
Debug.Assert(dispatcher.Reserved0 == cm);
}
return cm;
}
