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// 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_CHROMOTING_VIEW_H_
#define REMOTING_CLIENT_CHROMOTING_VIEW_H_
#include "base/ref_counted.h"
#include "remoting/base/decoder.h"
namespace remoting {
// ChromotingView defines the behavior of an object that draws a view of the
// remote desktop. Its main function is to choose the right decoder and render
// the update stream onto the screen.
class ChromotingView {
public:
ChromotingView();
virtual ~ChromotingView();
// Get screen dimensions.
// TODO(garykac): This will need to be extended to support multi-monitors.
void GetScreenSize(int* width, int* height);
// Initialize the common structures for the view.
virtual bool Initialize() = 0;
// Free up resources allocated by this view.
virtual void TearDown() = 0;
// Tells the ChromotingView to paint the current image on the screen.
// TODO(hclam): Add rects as parameter if needed.
virtual void Paint() = 0;
// Fill the screen with one single static color, and ignore updates.
// Useful for debugging.
virtual void SetSolidFill(uint32 color) = 0;
// Removes a previously set solid fill. If no fill was previous set, this
// does nothing.
virtual void UnsetSolidFill() = 0;
// Reposition and resize the viewport into the backing store. If the viewport
// extends past the end of the backing store, it is filled with black.
virtual void SetViewport(int x, int y, int width, int height) = 0;
// Resize the underlying image that contains the host screen buffer.
// This should match the size of the output from the decoder.
//
// TODO(garykac): This handles only 1 screen. We need multi-screen support.
virtual void SetHostScreenSize(int width, int height) = 0;
// Handle the BeginUpdateStream message.
// This method should perform the following tasks:
// (1) Perform any platform-specific tasks for start of update stream.
// (2) Make sure the |frame_| has been initialized.
// (3) Delete the HostMessage.
virtual void HandleBeginUpdateStream(ChromotingHostMessage* msg) = 0;
// Handle the UpdateStreamPacket message.
// This method should perform the following tasks:
// (1) Extract the decoding from the update packet message.
// (2) Call SetupDecoder with the encoding to lazily initialize the decoder.
// We don't do this in BeginUpdateStream because the begin message
// doesn't contain the encoding.
// (3) Call BeginDecoding if this is the first packet of the stream.
// (4) Call the decoder's PartialDecode() method to decode the packet.
// This call will delete the HostMessage.
// Note:
// * For a given begin/end update stream, the encodings specified in the
// update packets must all match. We may revisit this constraint at a
// later date.
virtual void HandleUpdateStreamPacket(ChromotingHostMessage* msg) = 0;
// Handle the EndUpdateStream message.
// This method should perform the following tasks:
// (1) Call EndDecoding().
// (2) Perform any platform-specific tasks for end of update stream.
// (3) Delete the HostMessage.
virtual void HandleEndUpdateStream(ChromotingHostMessage* msg) = 0;
protected:
// Setup the decoder based on the given encoding.
// Returns true if a new decoder has already been started (with a call to
// BeginDecoding).
bool SetupDecoder(UpdateStreamEncoding encoding);
// Prepare the decoder to start decoding a chunk of data.
// This needs to be called if SetupDecoder() returns false.
bool BeginDecoding(Task* partial_decode_done, Task* decode_done);
// Decode the given message.
// BeginDecoding() must be called before any calls to Decode().
bool Decode(ChromotingHostMessage* msg);
// Finish decoding and send notifications to update the view.
bool EndDecoding();
// Decoder used to decode the video frames (or frame fragements).
scoped_ptr<Decoder> decoder_;
// Framebuffer for the decoder.
scoped_refptr<media::VideoFrame> frame_;
// Dimensions of |frame_| bitmap.
int frame_width_;
int frame_height_;
UpdatedRects update_rects_;
UpdatedRects all_update_rects_;
};
} // namespace remoting
#endif // REMOTING_CLIENT_CHROMOTING_VIEW_H_
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