V4L2SVDA/VAAPIVDA: use visible size from decoder and pass to client

media/gpu/vp9_picture.h

 // Copyright 2015 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_GPU_VP9_PICTURE_H_
 #define MEDIA_GPU_VP9_PICTURE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/filters/vp9_parser.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace media {
 
 class V4L2VP9Picture;
 class VaapiVP9Picture;
 
 class VP9Picture : public base::RefCounted<VP9Picture> {
  public:
   VP9Picture();
 
   virtual V4L2VP9Picture* AsV4L2VP9Picture();
   virtual VaapiVP9Picture* AsVaapiVP9Picture();
 
   std::unique_ptr<Vp9FrameHeader> frame_hdr;
 
+  // The visible size of picture. This could be either parsed from frame
+  // header, or set to gfx::Rect(0, 0) for indicating the client using the

[Owen Lin, 2017/06/13 03:00:14]

nit: I think we don't need to explain what to do in the client here.

Just "for indicating the information is invalid or not available"?

[johnylin1, 2017/06/14 14:11:22]

Done.

+  // visible size extracted from the container instead.
+  gfx::Rect visible_rect;
+
  protected:
   friend class base::RefCounted<VP9Picture>;
   virtual ~VP9Picture();
 
   DISALLOW_COPY_AND_ASSIGN(VP9Picture);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_VP9_PICTURE_H_