remoting/base/decoder_zlib.h

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef REMOTING_BASE_DECODER_ZLIB_H_
   6 #define REMOTING_BASE_DECODER_ZLIB_H_
   7
   8 #include "remoting/base/decoder.h"
   9
  10 namespace remoting {
  11
  12 class DecompressorZlib;
  13
  14 class DecoderZlib : public Decoder {
  15  public:
  16   DecoderZlib();
  17
  18   // Decoder implementations.
  19   virtual bool BeginDecode(scoped_refptr<media::VideoFrame> frame,
  20                            UpdatedRects* update_rects,
  21                            Task* partial_decode_done,
  22                            Task* decode_done);
  23   virtual bool PartialDecode(HostMessage* message);
  24   virtual void EndDecode();
  25
  26   // TODO(hclam): Should make this into the Decoder interface.
  27   void set_reverse_rows(bool reverse) { reverse_rows_ = reverse; }
  28
  29  private:
  30   bool HandleBeginRect(HostMessage* message);
  31   bool HandleRectData(HostMessage* message);
  32   bool HandleEndRect(HostMessage* message);
  33
  34   // The internal state of the decoder.
  35   State state_;
  36
  37   // Keeps track of the updating rect.
  38   int rect_x_;
  39   int rect_y_;
  40   int rect_width_;
  41   int rect_height_;
  42   int bytes_per_pixel_;
  43
  44   // Tasks to call when decode is done.
  45   scoped_ptr<Task> partial_decode_done_;
  46   scoped_ptr<Task> decode_done_;
  47
  48   // The video frame to write to.
  49   scoped_refptr<media::VideoFrame> frame_;
  50   UpdatedRects* updated_rects_;
  51
  52   // A zlib decompressor used throughout one update sequence.
  53   scoped_ptr<DecompressorZlib> decompressor_;
  54
  55   // The position in the row that we are updating.
  56   int row_pos_;
  57
  58   // The row number in the rect that we are updaing.
  59   int row_y_;
  60
  61   // True if we should decode the image upside down.
  62   bool reverse_rows_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(DecoderZlib);
  65 };
  66
  67 }  // namespace remoting
  68
  69 #endif  // REMOTING_BASE_DECODER_ZLIB_H_