Replace RectVectors with SkRegions in Decoder.

remoting/base/decoder.h

 // Copyright (c) 2011 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_H_
 #define REMOTING_BASE_DECODER_H_
 
-#include <vector>
-
 #include "base/memory/scoped_ptr.h"
 #include "media/base/video_frame.h"
 #include "remoting/proto/video.pb.h"
-#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkRegion.h"
 
 namespace remoting {
 
-typedef std::vector<SkIRect> RectVector;
-
 // Interface for a decoder that takes a stream of bytes from the network and
 // outputs frames of data.
 //
 // TODO(ajwong): Beef up this documentation once the API stablizes.
 class Decoder {
  public:
   // DecodeResult is returned from DecodePacket() and indicates current state
   // of the decoder. DECODE_DONE means that last packet for the frame was
   // processed, and the frame can be displayed now. DECODE_IN_PROGRESS
   // indicates that the decoder must receive more data before the frame can be
   // displayed. DECODE_ERROR is returned if there was an error in the stream.
   enum DecodeResult {
     DECODE_ERROR = -1,
     DECODE_IN_PROGRESS,
     DECODE_DONE,
   };
 
   Decoder() {}
   virtual ~Decoder() {}
 
   // Initializes the decoder to draw into the given |frame|.
   virtual void Initialize(scoped_refptr<media::VideoFrame> frame) = 0;
 
   // Feeds more data into the decoder.
   virtual DecodeResult DecodePacket(const VideoPacket* packet) = 0;
 
-  // Returns rects that were updated in the last frame. Can be called only
+  // Returns the region affected by the most recent frame.  Can be called only
   // after DecodePacket returned DECODE_DONE. Caller keeps ownership of
-  // |rects|. |rects| is kept empty if whole screen needs to be updated.
-  virtual void GetUpdatedRects(RectVector* rects) = 0;
+  // |region|.
+  virtual void GetUpdatedRegion(SkRegion* region) = 0;
 
   // Reset the decoder to an uninitialized state. Release all references to
   // the initialized |frame|.  Initialize() must be called before the decoder
   // is used again.
   virtual void Reset() = 0;
 
   // Returns true if decoder is ready to accept data via DecodePacket.
   virtual bool IsReadyForData() = 0;
 
   virtual VideoPacketFormat::Encoding Encoding() = 0;
 
   // Set the output dimensions for the decoder.  If the dimensions are empty
   // then the source is rendered without scaling.
   // Output dimensions are ignored if the decoder doesn't support scaling.
   virtual void SetOutputSize(const SkISize& size) {}
 
   // Set the clipping rectangle to the decoder. Decoder should respect this and
   // only output changes in this rectangle. The new clipping rectangle will be
   // effective on the next decoded video frame.
-  //
-  // When scaling is enabled clipping rectangles are ignored.
   virtual void SetClipRect(const SkIRect& clip_rect) {}
 
-  // Force decoder to output a video frame with content in |rects| using the
-  // last decoded video frame.  |rects| are expressed in video frame rather
-  // than output coordinates.
-  virtual void RefreshRects(const RectVector& rects) {}
+  // Force decoder to output a frame based on the specified |region| of the
+  // most recently decoded video frame.  |region| is expressed in video frame
+  // rather than output coordinates.
+  virtual void RefreshRegion(const SkRegion& region) {}
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_DECODER_H_