Add VideoImageGenerator.

media/filters/skcanvas_video_renderer.h

 // Copyright (c) 2012 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 MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
 #define MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
 
+#include "base/memory/ref_counted.h"

[rileya (GONE FROM CHROMIUM), 2014/09/03 02:42:55]

SkCanvasVideoRenderer now takes a scoped_refptr<VideoFrame> rather than a raw
pointer.

The VideoImageGenerator won't get called into by Skia until it actually needs
the pixels, so there may be some cases where the VideoFrame needs to outlive the
scope of the Paint() call in SkCanvasVideoRenderer.

Currently I don't think we run into this, but down the road I'd like to be able
to, say, hand the software compositor a SkBitmap backed by the
VideoImageGenerator and do the YUV conversion lazily.

 #include "base/time/time.h"
 #include "media/base/media_export.h"
 #include "media/base/video_rotation.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/rect.h"
 
 class SkCanvas;
 
 namespace media {
 
 class VideoFrame;
 
 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
 // conversion and caching of resulting RGB bitmaps.
 class MEDIA_EXPORT SkCanvasVideoRenderer {
  public:
   SkCanvasVideoRenderer();
   ~SkCanvasVideoRenderer();
 
   // Paints |video_frame| on |canvas|, scaling the result to fit dimensions
   // specified by |dest_rect|.
   //
   // Black will be painted on |canvas| if |video_frame| is null.
-  void Paint(media::VideoFrame* video_frame,
+  void Paint(scoped_refptr<VideoFrame> video_frame,

[scherkus (not reviewing), 2014/09/03 22:51:50]

const ref

              SkCanvas* canvas,
              const gfx::RectF& dest_rect,
              uint8 alpha,
              SkXfermode::Mode mode,
              VideoRotation video_rotation);
 
   // Copy |video_frame| on |canvas|.
-  void Copy(media::VideoFrame* video_frame, SkCanvas* canvas);
+  void Copy(scoped_refptr<VideoFrame> video_frame, SkCanvas* canvas);

[scherkus (not reviewing), 2014/09/03 22:51:50]

const ref

 
  private:
   // An RGB bitmap and corresponding timestamp of the previously converted
   // video frame data.
   SkBitmap last_frame_;
   base::TimeDelta last_frame_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_