Move decoder into separate thread, clean up API layering, and redo update protocl

remoting/base/decoder_zlib.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_BASE_DECODER_ZLIB_H_
-#define REMOTING_BASE_DECODER_ZLIB_H_
-
-#include "remoting/base/decoder.h"
-
-namespace remoting {
-
-class DecompressorZlib;
-
-class DecoderZlib : public Decoder {
- public:
-  DecoderZlib();
-
-  // Decoder implementations.
-  virtual bool BeginDecode(scoped_refptr<media::VideoFrame> frame,
-                           UpdatedRects* update_rects,
-                           Task* partial_decode_done,
-                           Task* decode_done);
-  virtual bool PartialDecode(ChromotingHostMessage* message);
-  virtual void EndDecode();
-
-  // TODO(hclam): Should make this into the Decoder interface.
-  void set_reverse_rows(bool reverse) { reverse_rows_ = reverse; }
-
- private:
-  bool HandleBeginRect(ChromotingHostMessage* message);
-  bool HandleRectData(ChromotingHostMessage* message);
-  bool HandleEndRect(ChromotingHostMessage* message);
-
-  // The internal state of the decoder.
-  State state_;
-
-  // Keeps track of the updating rect.
-  int rect_x_;
-  int rect_y_;
-  int rect_width_;
-  int rect_height_;
-  int bytes_per_pixel_;
-
-  // Tasks to call when decode is done.
-  scoped_ptr<Task> partial_decode_done_;
-  scoped_ptr<Task> decode_done_;
-
-  // The video frame to write to.
-  scoped_refptr<media::VideoFrame> frame_;
-  UpdatedRects* updated_rects_;
-
-  // A zlib decompressor used throughout one update sequence.
-  scoped_ptr<DecompressorZlib> decompressor_;
-
-  // The position in the row that we are updating.
-  int row_pos_;
-
-  // The row number in the rect that we are updaing.
-  int row_y_;
-
-  // True if we should decode the image upside down.
-  bool reverse_rows_;
-
-  DISALLOW_COPY_AND_ASSIGN(DecoderZlib);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_BASE_DECODER_ZLIB_H_