OLD | NEW |
| (Empty) |
1 // Copyright 2014 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 CONTENT_RENDERER_MEDIA_VIDEO_FRAME_COMPOSITOR_H_ | |
6 #define CONTENT_RENDERER_MEDIA_VIDEO_FRAME_COMPOSITOR_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "cc/layers/video_frame_provider.h" | |
11 #include "content/common/content_export.h" | |
12 #include "ui/gfx/size.h" | |
13 | |
14 namespace media { | |
15 class VideoFrame; | |
16 } | |
17 | |
18 namespace content { | |
19 | |
20 // VideoFrameCompositor handles incoming frames by notifying the compositor and | |
21 // dispatching callbacks when detecting changes in video frames. | |
22 // | |
23 // Typical usage is to deliver ready-to-be-displayed video frames to | |
24 // UpdateCurrentFrame() so that VideoFrameCompositor can take care of tracking | |
25 // changes in video frames and firing callbacks as needed. | |
26 // | |
27 // VideoFrameCompositor must live on the same thread as the compositor. | |
28 class CONTENT_EXPORT VideoFrameCompositor | |
29 : NON_EXPORTED_BASE(public cc::VideoFrameProvider) { | |
30 public: | |
31 // |natural_size_changed_cb| is run with the new natural size of the video | |
32 // frame whenever a change in natural size is detected. It is not called the | |
33 // first time UpdateCurrentFrame() is called. Run on the same thread as the | |
34 // caller of UpdateCurrentFrame(). | |
35 // | |
36 // |opacity_changed_cb| is run when a change in opacity is detected. It *is* | |
37 // called the first time UpdateCurrentFrame() is called. Run on the same | |
38 // thread as the caller of UpdateCurrentFrame(). | |
39 // | |
40 // TODO(scherkus): Investigate the inconsistency between the callbacks with | |
41 // respect to why we don't call |natural_size_changed_cb| on the first frame. | |
42 // I suspect it was for historical reasons that no longer make sense. | |
43 VideoFrameCompositor( | |
44 const base::Callback<void(gfx::Size)>& natural_size_changed_cb, | |
45 const base::Callback<void(bool)>& opacity_changed_cb); | |
46 virtual ~VideoFrameCompositor(); | |
47 | |
48 // cc::VideoFrameProvider implementation. | |
49 virtual void SetVideoFrameProviderClient( | |
50 cc::VideoFrameProvider::Client* client) OVERRIDE; | |
51 virtual scoped_refptr<media::VideoFrame> GetCurrentFrame() OVERRIDE; | |
52 virtual void PutCurrentFrame( | |
53 const scoped_refptr<media::VideoFrame>& frame) OVERRIDE; | |
54 | |
55 // Updates the current frame and notifies the compositor. | |
56 void UpdateCurrentFrame(const scoped_refptr<media::VideoFrame>& frame); | |
57 | |
58 private: | |
59 base::Callback<void(gfx::Size)> natural_size_changed_cb_; | |
60 base::Callback<void(bool)> opacity_changed_cb_; | |
61 | |
62 cc::VideoFrameProvider::Client* client_; | |
63 | |
64 scoped_refptr<media::VideoFrame> current_frame_; | |
65 | |
66 DISALLOW_COPY_AND_ASSIGN(VideoFrameCompositor); | |
67 }; | |
68 | |
69 } // namespace content | |
70 | |
71 #endif // CONTENT_RENDERER_MEDIA_VIDEO_FRAME_COMPOSITOR_H_ | |
OLD | NEW |