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| 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_ | |
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