media: Optimize HW Video to 2D Canvas copy.

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/time/time.h"
-#include "media/base/media_export.h"
-#include "third_party/skia/include/core/SkBitmap.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,
-             SkCanvas* canvas,
-             const gfx::RectF& dest_rect,
-             uint8 alpha);
-
- 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_