mozilla: deliver async events under windows

In the windows gecko-sdk the call NPN_PluginThreadAsyncCall() is not supported, so the code most resort to an older method of sending async events from the plugin to the browser.
Source: http://stackoverflow.com/questions/1931883/generating-async-javascript-events-from-browser-plugin-npapi

projects/mozilla/vlcplugin.cpp

@@ -41,6 +41,7 @@
 #elif defined(XP_WIN)
     /* windows headers */
 #   include <winbase.h>
+extern void ScheduleAsyncCall(HWND p_hwnd, void (*func)(void *), void *userData);
 #else
 #warning "locking not implemented for this platform"
 #endif
@@ -210,9 +211,12 @@ void EventObj::callback(const libvlc_event_t* event)
 void VlcPlugin::event_callback(const libvlc_event_t* event, void *param)
 {
     VlcPlugin *plugin = (VlcPlugin*)param;
-#if defined(XP_UNIX)
     plugin->events.callback(event);
+#if defined(XP_UNIX)
     NPN_PluginThreadAsyncCall(plugin->getBrowser(), eventAsync, plugin);
+#elif defined(XP_WIN)
+    HWND hwnd = (HWND)plugin->getWindow().window;
+    ScheduleAsyncCall(hwnd, eventAsync, plugin);
 #else
 #warning NPN_PluginThreadAsyncCall not implemented yet.
     printf("No NPN_PluginThreadAsyncCall(), doing nothing.");

projects/mozilla/vlcplugin.h

 /*****************************************************************************
  * vlcplugin.h: a VLC plugin for Mozilla
  *****************************************************************************
- * Copyright (C) 2002-2009 the VideoLAN team
+ * Copyright (C) 2002-2010 the VideoLAN team
  * $Id$
  *
  * Authors: Samuel Hocevar <sam@zoy.org>

projects/mozilla/vlcshell.cpp

@@ -727,10 +727,33 @@ void NPP_Print( NPP instance, NPPrint* printInfo )
  * Windows-only methods
  *****************************************************************************/
 #if defined(XP_WIN)
+#define WM_ASYNCTHREADINVOKE    WM_USER + 1
+
+struct WINDOWS_ASYNC_EVENT
+{
+    WINDOWS_ASYNC_EVENT(void (*f)(void *), void *ud)
+            : func(f), userData(ud) { }
+    void (*func)(void *);
+    void *userData;
+};
+
+void ScheduleAsyncCall(HWND p_hwnd, void (*func)(void *), void *userData)
+{
+    if (p_hwnd != NULL)
+        ::PostMessage(p_hwnd, WM_ASYNCTHREADINVOKE, NULL,
+            (LPARAM)new ::WINDOWS_ASYNC_EVENT(func, userData));
+}
+
 static LRESULT CALLBACK Manage( HWND p_hwnd, UINT i_msg, WPARAM wpar, LPARAM lpar )
 {
     VlcPlugin* p_plugin = reinterpret_cast<VlcPlugin*>(GetWindowLongPtr(p_hwnd, GWLP_USERDATA));
 
+    if (i_msg == WM_ASYNCTHREADINVOKE) {
+        WINDOWS_ASYNC_EVENT *evt = static_cast<WINDOWS_ASYNC_EVENT*>((void*)lpar);
+        evt->func(evt->userData);
+        return S_OK;
+    }
+
     switch( i_msg )
     {
         case WM_ERASEBKGND:

projects/mozilla/vlcshell.h

@@ -78,4 +78,8 @@ int16_t NPP_HandleEvent( NPP instance, void * event );
 #endif
 #endif
 
+#ifdef XP_WIN
+void ScheduleAsyncCall(HWND p_hwnd, void (*func)(void *), void *userData);
+#endif /* XP_WIN */
+
 #endif