Desynchronize windowless plugin painting. This greatly improves the painting...

chrome/plugin/webplugin_proxy.h

 // Copyright (c) 2006-2008 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_PLUGIN_PLUGIN_WEBPLUGIN_PROXY_H__
 #define CHROME_PLUGIN_PLUGIN_WEBPLUGIN_PROXY_H__
 
 #include "base/hash_tables.h"
 #include "base/ref_counted.h"
 #include "base/scoped_handle.h"
+#include "base/shared_memory.h"
+#include "base/timer.h"
 #include "chrome/common/ipc_message.h"
 #include "chrome/common/chrome_plugin_api.h"
 #include "webkit/glue/webplugin.h"
 
 class PluginChannel;
-class WebPluginDelegate;
+class WebPluginDelegateImpl;
 
 // This is an implementation of WebPlugin that proxies all calls to the
 // renderer.
 class WebPluginProxy : public WebPlugin {
  public:
   // Creates a new proxy for WebPlugin, using the given sender to send the
   // marshalled WebPlugin calls.
   WebPluginProxy(PluginChannel* channel,
                  int route_id,
-                 WebPluginDelegate* delegate,
+                 WebPluginDelegateImpl* delegate,
                  HANDLE modal_dialog_event);
   ~WebPluginProxy();
 
   // WebPlugin overrides
   void SetWindow(HWND window, HANDLE pump_messages_event);
   void CancelResource(int id);
   void Invalidate();
   void InvalidateRect(const gfx::Rect& rect);
   NPObject* GetWindowScriptNPObject();
   NPObject* GetPluginElement();
@@ skipping 16 matching lines @@
   CPBrowsingContext GetCPBrowsingContext();
 
   // Retrieves the WebPluginProxy for the given context that was returned by
   // GetCPBrowsingContext, or NULL if not found.
   static WebPluginProxy* FromCPBrowsingContext(CPBrowsingContext context);
 
   // Returns a WebPluginResourceClient object given its id, or NULL if no
   // object with that id exists.
   WebPluginResourceClient* GetResourceClient(int id);
 
-  void WillPaint();
-
   // Notification received on a plugin issued resource request
   // creation.
   void OnResourceCreated(int resource_id, HANDLE cookie);
 
   void HandleURLRequest(const char *method,
                         bool is_javascript_url,
                         const char* target, unsigned int len,
                         const char* buf, bool is_file_data,
                         bool notify, const char* url,
                         void* notify_data, bool popups_allowed);
 
+  void UpdateGeometry(const gfx::Rect& window_rect,
+                      const gfx::Rect& clip_rect,
+                      bool visible,
+                      const SharedMemoryHandle& windowless_buffer,
+                      const SharedMemoryLock& lock);
+
  private:
   bool Send(IPC::Message* msg);
 
+  // Called periodically so that we can paint windowless plugins.
+  void OnPaintTimerFired();
+
+  // Updates the shared memory section where windowless plugins paint.
+  void SetWindowlessBuffer(const SharedMemoryHandle& handle,
+                           const SharedMemoryLock& lock);
+
+  // Called when a plugin's origin moves, so that we can update the world
+  // transform of the local HDC.
+  void UpdateTransform();
+
   typedef base::hash_map<int, WebPluginResourceClient*> ResourceClientMap;
   ResourceClientMap resource_clients_;
 
   scoped_refptr<PluginChannel> channel_;
   int route_id_;
   NPObject* window_npobject_;
   NPObject* plugin_element_;
-  WebPluginDelegate* delegate_;
-  gfx::Rect damaged_rect_;
-  bool waiting_for_paint_;
+  WebPluginDelegateImpl* delegate_;
   uint32 cp_browsing_context_;
   ScopedHandle modal_dialog_event_;
+
+  // Used to desynchronize windowless painting.  We accumulate invalidates and
+  // paint into a shared buffer when our repeating timer fires.  After painting
+  // we tell the renderer asynchronously and it paints from the buffer.  This
+  // allows the renderer to paint without a blocking call, which improves
+  // performance, and lets us control the frame rate at which we paint.
+  gfx::Rect damaged_rect_;
+  base::RepeatingTimer<WebPluginProxy> paint_timer_;
+  ScopedHandle windowless_shared_section_;
+  ScopedBitmap windowless_bitmap_;
+  ScopedHDC windowless_hdc_;
+  ScopedHandle windowless_buffer_lock_;
 };
 
 #endif  // CHROME_PLUGIN_PLUGIN_WEBPLUGIN_PROXY_H__