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// 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_CLIENT_RECTANGLE_UPDATE_DECODER_H
#define REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H
#include "base/memory/scoped_ptr.h"
#include "base/task.h"
#include "media/base/video_frame.h"
#include "remoting/base/decoder.h"
class MessageLoop;
namespace remoting {
class FrameConsumer;
class VideoPacketFormat;
class VideoPacket;
namespace protocol {
class SessionConfig;
} // namespace protocol
// TODO(ajwong): Re-examine this API, especially with regards to how error
// conditions on each step are reported. Should they be CHECKs? Logs? Other?
// TODO(sergeyu): Rename this class.
class RectangleUpdateDecoder :
public base::RefCountedThreadSafe<RectangleUpdateDecoder> {
public:
RectangleUpdateDecoder(MessageLoop* message_loop,
FrameConsumer* consumer);
// Initializes decoder with the infromation from the protocol config.
void Initialize(const protocol::SessionConfig& config);
// Decodes the contents of |packet| calling OnPartialFrameOutput() in the
// regsitered as data is avaialable. DecodePacket may keep a reference to
// |packet| so the |packet| must remain alive and valid until |done| is
// executed.
//
// TODO(ajwong): Should packet be a const pointer to make the lifetime
// more clear?
void DecodePacket(const VideoPacket* packet, Task* done);
// Set the scale ratio for the decoded video frame. Scale ratio greater
// than 1.0 is not supported.
void SetScaleRatios(double horizontal_ratio, double vertical_ratio);
// Set a new clipping rectangle for the decoder. Decoder should respect
// this clipping rectangle and only decode content in this rectangle and
// report dirty rectangles accordingly to enhance performance.
//
// If scale ratio is not 1.0 then clipping rectangle is ignored.
void UpdateClipRect(const SkIRect& clip_rect);
// Force the decoder to output the last decoded video frame without any
// clipping.
void RefreshFullFrame();
private:
friend class base::RefCountedThreadSafe<RectangleUpdateDecoder>;
friend class PartialFrameCleanup;
~RectangleUpdateDecoder();
void AllocateFrame(const VideoPacket* packet, Task* done);
void ProcessPacketData(const VideoPacket* packet, Task* done);
void RefreshRects(const RectVector& rects);
// Obtain updated rectangles from decoder and submit it to the consumer.
void SubmitToConsumer();
// Use |refresh_rects_| to do a refresh to the backing video frame.
// When done the affected rectangles are submitted to the consumer.
void DoRefresh();
// Called by PartialFrameCleanup when consumer has finished using our
// internal frame.
void OnFrameConsumed();
// Pointers to infrastructure objects. Not owned.
MessageLoop* message_loop_;
FrameConsumer* consumer_;
SkISize initial_screen_size_;
SkIRect clip_rect_;
RectVector refresh_rects_;
scoped_ptr<Decoder> decoder_;
// The video frame that the decoder writes to.
scoped_refptr<media::VideoFrame> frame_;
bool frame_is_new_;
// True if |consumer_| is currently using the frame.
bool frame_is_consuming_;
};
} // namespace remoting
DISABLE_RUNNABLE_METHOD_REFCOUNT(remoting::RectangleUpdateDecoder);
#endif // REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H