Bug 1095754 - In the content process provide a way to track and access PluginInstanceParent objects from PluginWidgetChild. r=aklotz

dom/plugins/ipc/PluginInstanceParent.cpp

@@ -43,7 +43,8 @@
 #include <windowsx.h>
 #include "gfxWindowsPlatform.h"
 #include "mozilla/plugins/PluginSurfaceParent.h"
-
+#include "nsClassHashtable.h"
+#include "nsHashKeys.h"
 // Plugin focus event for widget.
 extern const wchar_t* kOOPPPluginFocusEventId;
 UINT gOOPPPluginFocusEvent =
@@ -73,6 +74,29 @@ StreamNotifyParent::RecvRedirectNotifyResponse(const bool& allow)
   return true;
 }
 
+#if defined(XP_WIN)
+namespace mozilla {
+namespace plugins {
+/**
+ * e10s specific, used in cross referencing hwnds with plugin instances so we
+ * can access methods here from PluginWidgetChild.
+ */
+static nsClassHashtable<nsVoidPtrHashKey, PluginInstanceParent>* sPluginInstanceList;
+
+// static
+PluginInstanceParent*
+PluginInstanceParent::LookupPluginInstanceByID(uintptr_t aId)
+{
+    MOZ_ASSERT(NS_IsMainThread());
+    if (sPluginInstanceList) {
+        return sPluginInstanceList->Get((void*)aId);
+    }
+    return nullptr;
+}
+}
+}
+#endif
+
 PluginInstanceParent::PluginInstanceParent(PluginModuleParent* parent,
                                            NPP npp,
                                            const nsCString& aMimeType,
@@ -95,6 +119,11 @@ PluginInstanceParent::PluginInstanceParent(PluginModuleParent* parent,
     , mShColorSpace(nullptr)
 #endif
 {
+#if defined(OS_WIN)
+    if (!sPluginInstanceList) {
+        sPluginInstanceList = new nsClassHashtable<nsVoidPtrHashKey, PluginInstanceParent>();
+    }
+#endif
 }
 
 PluginInstanceParent::~PluginInstanceParent()
@@ -1756,15 +1785,28 @@ PluginInstanceParent::PluginWindowHookProc(HWND hWnd,
 void
 PluginInstanceParent::SubclassPluginWindow(HWND aWnd)
 {
-    if (XRE_GetProcessType() == GeckoProcessType_Content) {
-      mPluginHWND = aWnd; // now a remote window, we can't subclass this
-      mPluginWndProc = nullptr;
+    if ((aWnd && mPluginHWND == aWnd) || (!aWnd && mPluginHWND)) {
         return;
     }
+
+#if defined(XP_WIN)
+    if (XRE_GetProcessType() == GeckoProcessType_Content) {
+        if (!aWnd) {
+            NS_WARNING("PluginInstanceParent::SubclassPluginWindow unexpected null window");
+            return;
+        }
+        mPluginHWND = aWnd; // now a remote window, we can't subclass this
+        mPluginWndProc = nullptr;
+        // Note sPluginInstanceList wil delete 'this' if we do not remove
+        // it on shutdown.
+        sPluginInstanceList->Put((void*)mPluginHWND, this);
+        return;
+    }
+#endif
+
     NS_ASSERTION(!(mPluginHWND && aWnd != mPluginHWND),
         "PluginInstanceParent::SubclassPluginWindow hwnd is not our window!");
 
-    if (!mPluginHWND) {
     mPluginHWND = aWnd;
     mPluginWndProc =
         (WNDPROC)::SetWindowLongPtrA(mPluginHWND, GWLP_WNDPROC,
@@ -1775,11 +1817,28 @@ PluginInstanceParent::SubclassPluginWindow(HWND aWnd)
     NS_ASSERTION(bRes,
         "PluginInstanceParent::SubclassPluginWindow failed to set prop!");
 }
-}
 
 void
 PluginInstanceParent::UnsubclassPluginWindow()
 {
+#if defined(XP_WIN)
+    if (XRE_GetProcessType() == GeckoProcessType_Content) {
+        if (mPluginHWND) {
+            // Remove 'this' from the plugin list safely
+            nsAutoPtr<PluginInstanceParent> tmp;
+            MOZ_ASSERT(sPluginInstanceList);
+            sPluginInstanceList->RemoveAndForget((void*)mPluginHWND, tmp);
+            tmp.forget();
+            if (!sPluginInstanceList->Count()) {
+                delete sPluginInstanceList;
+                sPluginInstanceList = nullptr;
+            }
+        }
+        mPluginHWND = nullptr;
+        return;
+    }
+#endif
+
     if (mPluginHWND && mPluginWndProc) {
         ::SetWindowLongPtrA(mPluginHWND, GWLP_WNDPROC,
                             reinterpret_cast<LONG_PTR>(mPluginWndProc));

dom/plugins/ipc/PluginInstanceParent.h

@@ -51,6 +51,15 @@ class PluginInstanceParent : public PPluginInstanceParent
     friend class PluginStreamParent;
     friend class StreamNotifyParent;
 
+#if defined(XP_WIN)
+public:
+    /**
+     * Helper method for looking up instances based on a supplied id.
+     */
+    static PluginInstanceParent*
+    LookupPluginInstanceByID(uintptr_t aId);
+#endif // defined(XP_WIN)
+
 public:
     PluginInstanceParent(PluginModuleParent* parent,
                          NPP npp,

dom/plugins/ipc/PluginWidgetChild.cpp

@@ -4,6 +4,13 @@
 
 #include "mozilla/plugins/PluginWidgetChild.h"
 #include "PluginWidgetProxy.h"
+#include "mozilla/DebugOnly.h"
+#include "nsDebug.h"
+
+#if defined(XP_WIN)
+#include "mozilla/plugins/PluginInstanceParent.h"
+using mozilla::plugins::PluginInstanceParent;
+#endif
 
 namespace mozilla {
 namespace plugins {
@@ -28,6 +35,26 @@ PluginWidgetChild::ActorDestroy(ActorDestroyReason aWhy)
   mWidget = nullptr;
 }
 
+bool
+PluginWidgetChild::RecvUpdateWindow(const uintptr_t& aChildId)
+{
+#if defined(XP_WIN)
+  NS_ASSERTION(aChildId, "Expected child hwnd value for remote plugin instance.");
+  PluginInstanceParent* parentInstance =
+    PluginInstanceParent::LookupPluginInstanceByID(aChildId);
+  NS_ASSERTION(parentInstance, "Expected matching plugin instance");
+  if (parentInstance) {
+    // sync! update call to the plugin instance that forces the
+    // plugin to paint its child window.
+    parentInstance->CallUpdateWindow();
+  }
+  return true;
+#else
+  NS_NOTREACHED("PluginWidgetChild::RecvUpdateWindow calls unexpected on this platform.");
+  return false;
+#endif
+}
+
 } // namespace plugins
 } // namespace mozilla
 

dom/plugins/ipc/PluginWidgetChild.h

@@ -19,6 +19,7 @@ public:
   PluginWidgetChild();
   virtual ~PluginWidgetChild();
 
+  virtual bool RecvUpdateWindow(const uintptr_t& aChildId) MOZ_OVERRIDE;
   virtual void ActorDestroy(ActorDestroyReason aWhy) MOZ_OVERRIDE;
 
   mozilla::widget::PluginWidgetProxy* mWidget;