Bug 386537. Provide a reliable way for plugins to detect whether windowless mode is available. patch by karlt, r+sr=jst, a=jonas

modules/plugin/base/public/npapi.h

@@ -37,7 +37,7 @@
 
 
 /*
- *  npapi.h $Revision: 3.46 $
+ *  npapi.h $Revision: 3.47 $
  *  Netscape client plug-in API spec
  */
 
@@ -436,7 +436,9 @@ typedef enum {
   NPNVWindowNPObject = 15,
 
   /* Get the NPObject wrapper for the plugins DOM element. */
-  NPNVPluginElementNPObject = 16
+  NPNVPluginElementNPObject = 16,
+
+  NPNVSupportsWindowless = 17
 
 #ifdef XP_MACOSX
   /* Used for negotiating drawing models */

modules/plugin/base/src/ns4xPlugin.cpp

@@ -1985,6 +1985,15 @@ _getvalue(NPP npp, NPNVariable variable, void *result)
     return NPERR_NO_ERROR;
   }
 
+  case NPNVSupportsWindowless: {
+#if defined(XP_WIN) || defined(XP_MACOSX) || (defined(MOZ_X11) && defined(MOZ_WIDGET_GTK2))
+    *(NPBool*)result = PR_TRUE;
+#else
+    *(NPBool*)result = PR_FALSE;
+#endif
+    return NPERR_NO_ERROR;
+  }
+
 #ifdef XP_MACOSX
   case NPNVpluginDrawingModel: {
     if (npp) {