gpu video: optimize HW video to SW canvas and implement it for WebRTC.

content/renderer/media/video_capture_impl.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.
 //
 // Notes about usage of this object by VideoCaptureImplManager.
 //
 // VideoCaptureImplManager access this object by using a Unretained()
 // binding and tasks on the IO thread. It is then important that
 // VideoCaptureImpl never post task to itself. All operations must be
 // synchronous.
@@ skipping 241 matching lines @@
                          buffer_id,
                          buffer,
                          0)));
 
   for (ClientInfoMap::iterator it = clients_.begin(); it != clients_.end();
        ++it) {
     it->second.deliver_frame_cb.Run(frame, format, timestamp);
   }
 }
 
-static void NullReadPixelsCB(const SkBitmap& bitmap) { NOTIMPLEMENTED(); }
-
 void VideoCaptureImpl::OnMailboxBufferReceived(
     int buffer_id,
     const gpu::MailboxHolder& mailbox_holder,
     const media::VideoCaptureFormat& format,
     base::TimeTicks timestamp) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (state_ != VIDEO_CAPTURE_STATE_STARTED || suspended_) {
     Send(new VideoCaptureHostMsg_BufferReady(device_id_, buffer_id, 0));
     return;
   }
 
   last_frame_format_ = format;
   if (first_frame_timestamp_.is_null())
     first_frame_timestamp_ = timestamp;
 
   scoped_refptr<media::VideoFrame> frame = media::VideoFrame::WrapNativeTexture(
       make_scoped_ptr(new gpu::MailboxHolder(mailbox_holder)),
       media::BindToCurrentLoop(base::Bind(
           &VideoCaptureImpl::OnClientBufferFinished, weak_factory_.GetWeakPtr(),
           buffer_id, scoped_refptr<ClientBuffer>())),
       last_frame_format_.frame_size, gfx::Rect(last_frame_format_.frame_size),
-      last_frame_format_.frame_size, timestamp - first_frame_timestamp_,
-      base::Bind(&NullReadPixelsCB), false);
+      last_frame_format_.frame_size, timestamp - first_frame_timestamp_, false);
 
   for (ClientInfoMap::iterator it = clients_.begin(); it != clients_.end();
        ++it) {
     it->second.deliver_frame_cb.Run(frame, format, timestamp);
   }
 }
 
 void VideoCaptureImpl::OnClientBufferFinished(
     int buffer_id,
     const scoped_refptr<ClientBuffer>& /* ignored_buffer */,
@@ skipping 136 matching lines @@
   ClientInfoMap::iterator it = clients->find(client_id);
   if (it != clients->end()) {
     it->second.state_update_cb.Run(VIDEO_CAPTURE_STATE_STOPPED);
     clients->erase(it);
     found = true;
   }
   return found;
 }
 
 }  // namespace content