Simplify ScreenCapturer interface.

media/video/capture/screen/screen_capturer_x11.cc

 // Copyright (c) 2012 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.
 
 #include "media/video/capture/screen/screen_capturer.h"
 
 #include <X11/extensions/Xdamage.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ skipping 34 matching lines @@
 class ScreenCapturerLinux : public ScreenCapturer {
  public:
   ScreenCapturerLinux();
   virtual ~ScreenCapturerLinux();
 
   // TODO(ajwong): Do we really want this to be synchronous?
   bool Init(bool use_x_damage);
 
   // Capturer interface.
   virtual void Start(Delegate* delegate) OVERRIDE;
-  virtual void Stop() OVERRIDE;
-  virtual void InvalidateRegion(const SkRegion& invalid_region) OVERRIDE;
   virtual void CaptureFrame() OVERRIDE;
 
  private:
   void InitXDamage();
 
   // Read and handle all currently-pending XEvents.
   // In the DAMAGE case, process the XDamage events and store the resulting
   // damage rectangles in the ScreenCapturerHelper.
   // In all cases, call ScreenConfigurationChanged() in response to any
   // ConfigNotify events.
@@ skipping 204 matching lines @@
   use_damage_ = true;
   LOG(INFO) << "Using XDamage extension.";
 }
 
 void ScreenCapturerLinux::Start(Delegate* delegate) {
   DCHECK(delegate_ == NULL);
 
   delegate_ = delegate;
 }
 
-void ScreenCapturerLinux::Stop() {
-}
-
-void ScreenCapturerLinux::InvalidateRegion(const SkRegion& invalid_region) {
-  helper_.InvalidateRegion(invalid_region);
-}
-
 void ScreenCapturerLinux::CaptureFrame() {
   base::Time capture_start_time = base::Time::Now();
 
   // Process XEvents for XDamage and cursor shape tracking.
   ProcessPendingXEvents();
 
   // If the current buffer is from an older generation then allocate a new one.
   // Note that we can't reallocate other buffers at this point, since the caller
   // may still be reading from them.
   if (queue_.current_frame_needs_update()) {
@@ skipping 340 matching lines @@
 // static
 scoped_ptr<ScreenCapturer> ScreenCapturer::CreateWithXDamage(
     bool use_x_damage) {
   scoped_ptr<ScreenCapturerLinux> capturer(new ScreenCapturerLinux());
   if (!capturer->Init(use_x_damage))
     capturer.reset();
   return capturer.PassAs<ScreenCapturer>();
 }
 
 }  // namespace media