Implement a chromoting client using X11

remoting/client/decoder.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_CLIENT_DECODER_H_
 #define REMOTING_CLIENT_DECODER_H_
 
 #include <vector>
 
-#include "base/callback.h"
+#include "base/task.h"
 #include "base/scoped_ptr.h"
 #include "gfx/rect.h"
 #include "media/base/video_frame.h"
 #include "remoting/base/protocol/chromotocol.pb.h"
 
 namespace remoting {
 
+// TODO(hclam): Merge this with the one in remoting/host/encoder.h.
+typedef std::vector<gfx::Rect> UpdatedRects;
+
 // Defines the behavior of a decoder for decoding images received from the
 // host.
 //
 // Sequence of actions with a decoder is as follows:
 //
-// 1. BeginDecode(VideoFrame)
+// 1. BeginDecode(PartialDecodeDone, DecodeDone, VideoFrame)
 // 2. PartialDecode(HostMessage)
 //    ...
 // 3. EndDecode()
 //
 // The decoder will reply with:
 // 1. PartialDecodeDone(VideoFrame, UpdatedRects)
 //    ...
 // 2. DecodeDone(VideoFrame)
 //
 // The format of VideoFrame is a contract between the object that creates the
 // decoder (most likely the renderer) and the decoder.
 class Decoder {
  public:
-  typedef std::vector<gfx::Rect> UpdatedRects;
-  typedef Callback2<scoped_refptr<media::VideoFrame>, UpdatedRects>::Type
-      PartialDecodeDoneCallback;
-  typedef Callback1<scoped_refptr<media::VideoFrame> >::Type
-      DecodeDoneCallback;
-
-  Decoder(PartialDecodeDoneCallback* partial_decode_done_callback,
-          DecodeDoneCallback* decode_done_callback)
-      : partial_decode_done_(partial_decode_done_callback),
-        decode_done_(decode_done_callback) {
-  }
 
   virtual ~Decoder() {
   }
 
   // Tell the decoder to use |frame| as a target to write the decoded image
   // for the coming update stream.
+  // If decode is partially done and |frame| can be read, |partial_decode_done|
+  // is called and |update_rects| contains the updated regions.
+  // If decode is completed |decode_done| is called.
   // Return true if the decoder can writes output to |frame| and accept
   // the codec format.
   // TODO(hclam): Provide more information when calling this function.
-  virtual bool BeginDecode(scoped_refptr<media::VideoFrame> frame) = 0;
+  virtual bool BeginDecode(scoped_refptr<media::VideoFrame> frame,
+                           UpdatedRects* updated_rects,
+                           Task* partial_decode_done,
+                           Task* decode_done) = 0;
 
   // Give a HostMessage that contains the update stream packet that contains
   // the encoded data to the decoder.
   // The decoder will own |message| and is responsible for deleting it.
   // If the decoder has written something into |frame|,
   // |partial_decode_done_| is called with |frame| and updated regions.
   // Return true if the decoder can accept |message| and decode it.
-  virtual bool PartialDecode(chromotocol_pb::HostMessage* message) = 0;
+  virtual bool PartialDecode(HostMessage* message) = 0;
 
   // Notify the decoder that we have received the last update stream packet.
   // If the decoding of the update stream has completed |decode_done_| is
   // called with |frame|.
   // If the update stream is not received fully and this method is called the
   // decoder should also call |decode_done_| as soon as possible.
   virtual void EndDecode() = 0;
-
- protected:
-  PartialDecodeDoneCallback* partial_decode_done() {
-    return partial_decode_done_.get();
-  }
-
-  DecodeDoneCallback* decode_done() {
-    return decode_done_.get();
-  }
-
- private:
-  scoped_ptr<PartialDecodeDoneCallback> partial_decode_done_;
-  scoped_ptr<DecodeDoneCallback> decode_done_;
-
-  DISALLOW_COPY_AND_ASSIGN(Decoder);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_DECODER_H_