Add acknowledgement messages for PluginMsg_UpdateGeometry

chrome/renderer/webplugin_delegate_proxy.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 #define CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 
 #include <string>
 #include <vector>
 
 #include "app/gfx/native_widget_types.h"
 #include "base/file_path.h"
 #include "base/gfx/rect.h"
 #include "base/ref_counted.h"
 #include "base/weak_ptr.h"
 #include "chrome/common/transport_dib.h"
 #include "chrome/renderer/plugin_channel_host.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message.h"
 #include "skia/ext/platform_canvas.h"
 #include "webkit/glue/webplugin.h"
 #include "webkit/glue/webplugininfo.h"
 #include "webkit/glue/webplugin_delegate.h"
 
+#if defined(OS_MACOSX)
+#include "base/hash_tables.h"
+#include "base/linked_ptr.h"
+#endif
+
 struct NPObject;
 class NPObjectStub;
 struct NPVariant_Param;
 struct PluginHostMsg_URLRequest_Params;
 class RenderView;
 class SkBitmap;
 
 namespace base {
 class SharedMemory;
 class WaitableEvent;
@@ skipping 91 matching lines @@
   void OnMissingPluginStatus(int status);
   void OnGetCPBrowsingContext(uint32* context);
   void OnCancelDocumentLoad();
   void OnInitiateHTTPRangeRequest(const std::string& url,
                                   const std::string& range_info,
                                   intptr_t existing_stream,
                                   bool notify_needed,
                                   intptr_t notify_data);
   void OnDeferResourceLoading(int resource_id, bool defer);
 
+#if defined(OS_MACOSX)
+  void OnUpdateGeometry_ACK(int ack_key);
+#endif
+
   // Draw a graphic indicating a crashed plugin.
   void PaintSadPlugin(WebKit::WebCanvas* canvas, const gfx::Rect& rect);
 
   // Returns true if the given rectangle is different in the native drawing
   // context and the current background bitmap.
   bool BackgroundChanged(gfx::NativeDrawingContext context,
                          const gfx::Rect& rect);
 
   // Copies the given rectangle from the transport bitmap to the backing store.
   void CopyFromTransportToBacking(const gfx::Rect& rect);
 
   // Clears the shared memory section and canvases used for windowless plugins.
   void ResetWindowlessBitmaps();
 
   // Creates a shared memory section and canvas.
   bool CreateBitmap(scoped_ptr<TransportDIB>* memory,
                     scoped_ptr<skia::PlatformCanvas>* canvas);
 
   // Called for cleanup during plugin destruction. Normally right before the
   // plugin window gets destroyed, or when the plugin has crashed (at which
   // point the window has already been destroyed).
   void WillDestroyWindow();
 
+#if defined(OS_MACOSX)
+  // The Mac TransportDIB implementation uses base::SharedMemory, which
+  // cannot be disposed of if an in-flight UpdateGeometry message refers to
+  // the shared memory file descriptor.  The old_transport_dibs_ map holds
+  // old TransportDIBs waiting to die.  It's keyed by the |ack_key| values
+  // used in UpdateGeometry messages.  When an UpdateGeometry_ACK message
+  // arrives, the associated RelatedTransportDIBs can be released.
+  struct RelatedTransportDIBs {
+    linked_ptr<TransportDIB> backing_store;
+    linked_ptr<TransportDIB> transport_store;
+    linked_ptr<TransportDIB> background_store;
+  };
+
+  typedef base::hash_map<int, RelatedTransportDIBs> OldTransportDIBMap;
+
+  OldTransportDIBMap old_transport_dibs_;
+#endif  // OS_MACOSX
+
   base::WeakPtr<RenderView> render_view_;
   webkit_glue::WebPlugin* plugin_;
   bool windowless_;
   gfx::PluginWindowHandle window_;
   scoped_refptr<PluginChannelHost> channel_host_;
   std::string mime_type_;
   int instance_id_;
   WebPluginInfo info_;
 
   gfx::Rect plugin_rect_;
@@ skipping 26 matching lines @@
   // This lets us know which portion of the backing store has been painted into.
   gfx::Rect backing_store_painted_;
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateProxy);
 };
 
 #endif  // CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_