1 files changed, 56 insertions, 0 deletions
diff --git a/dom/plugins/ipc/PluginBackgroundDestroyer.h b/dom/plugins/ipc/PluginBackgroundDestroyer.h
new file mode 100644
index 0000000000..627b09fdc4
--- /dev/null
+++ b/dom/plugins/ipc/PluginBackgroundDestroyer.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef dom_plugins_PluginBackgroundDestroyer
+#define dom_plugins_PluginBackgroundDestroyer
+
+#include "mozilla/plugins/PPluginBackgroundDestroyerChild.h"
+#include "mozilla/plugins/PPluginBackgroundDestroyerParent.h"
+
+#include "gfxSharedImageSurface.h"
+
+class gfxASurface;
+
+namespace mozilla {
+namespace plugins {
+
+/**
+ * When instances of this class are destroyed, the old background goes
+ * along with them, completing the destruction process (whether or not
+ * the plugin stayed alive long enough to ack).
+ */
+class PluginBackgroundDestroyerParent
+    : public PPluginBackgroundDestroyerParent {
+ public:
+  explicit PluginBackgroundDestroyerParent(gfxASurface* aDyingBackground);
+
+  virtual ~PluginBackgroundDestroyerParent();
+
+ private:
+  virtual void ActorDestroy(ActorDestroyReason why) override;
+
+  RefPtr<gfxASurface> mDyingBackground;
+};
+
+/**
+ * This class exists solely to instruct its instance to release its
+ * current background, a new one may be coming.
+ */
+class PluginBackgroundDestroyerChild : public PPluginBackgroundDestroyerChild {
+ public:
+  PluginBackgroundDestroyerChild() = default;
+  virtual ~PluginBackgroundDestroyerChild() = default;
+
+ private:
+  // Implementing this for good hygiene.
+  virtual void ActorDestroy(ActorDestroyReason why) override {}
+};
+
+}  // namespace plugins
+}  // namespace mozilla
+
+#endif  // dom_plugins_PluginBackgroundDestroyer