Initial pass at integrating Differ into the chromoting host code....

remoting/host/capturer_gdi.h

 // Copyright (c) 2010 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 REMOTING_HOST_CAPTURER_GDI_H_
 #define REMOTING_HOST_CAPTURER_GDI_H_
 
 #include <windows.h>
 typedef HBITMAP BitmapRef;
 #include "base/scoped_ptr.h"
 #include "remoting/host/capturer.h"
 
 namespace remoting {
 
+class Differ;
+
 // CapturerGdi captures 32bit RGB using GDI.
 //
 // CapturerGdi is doubled buffered as required by Capturer. See
 // remoting/host/capturer.h.
 class CapturerGdi : public Capturer {
  public:
   CapturerGdi();
   virtual ~CapturerGdi();
 
-  virtual void CaptureRects(const RectVector& rects,
-                            CaptureCompletedCallback* callback);
   virtual void ScreenConfigurationChanged();
 
  private:
+  virtual void CalculateInvalidRects();
+  virtual void CaptureRects(const InvalidRects& rects,
+                            CaptureCompletedCallback* callback);
+
   void ReleaseBuffers();
   // Generates an image in the current buffer.
   void CaptureImage();
 
   // Gdi specific information about screen.
   HDC desktop_dc_;
   HDC memory_dc_;
   HBITMAP target_bitmap_[kNumBuffers];
 
   // We have two buffers for the screen images as required by Capturer.
   void* buffers_[kNumBuffers];
 
+  // Class to calculate the difference between two screen bitmaps.
+  scoped_ptr<Differ> differ_;
+
+  // True if we should force a fullscreen capture.
+  bool capture_fullscreen_;
+
   DISALLOW_COPY_AND_ASSIGN(CapturerGdi);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CAPTURER_GDI_H_