gpu video: optimize HW video to SW canvas and implement it for WebRTC.

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"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
@@ skipping 13 matching lines @@
 
 // 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 and rotating the result to fit
   // dimensions specified by |dest_rect|.
-  // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE and |canvas|
-  // is ganeshed, |context_3d| must be provided.
+  // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE, |context_3d|
+  // must be provided.
   //
   // Black will be painted on |canvas| if |video_frame| is null.
   void Paint(const scoped_refptr<VideoFrame>& video_frame,
              SkCanvas* canvas,
              const gfx::RectF& dest_rect,
              uint8 alpha,
              SkXfermode::Mode mode,
              VideoRotation video_rotation,
              const Context3D& context_3d);
 
   // Copy |video_frame| on |canvas|.
-  void Copy(const scoped_refptr<VideoFrame>&, SkCanvas* canvas);
+  // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE, |context_3d|
+  // must be provided.
+  void Copy(const scoped_refptr<VideoFrame>& video_frame,
+            SkCanvas* canvas,
+            const Context3D& context_3d);
 
   // Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
   // should point into a buffer large enough to hold as many 32 bit RGBA pixels
   // as are in the visible_rect() area of the frame.
   static void ConvertVideoFrameToRGBPixels(
       const scoped_refptr<media::VideoFrame>& video_frame,
       void* rgb_pixels,
       size_t row_bytes);
 
   // Copy the contents of texture of |video_frame| to texture |texture|.
@@ skipping 27 matching lines @@
   VideoImageGenerator* accelerated_generator_;
   base::TimeDelta accelerated_last_frame_timestamp_;
   base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_