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 "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 GrContext;
 class SkCanvas;
 
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
+
 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();
 
+  struct Context3DProvider {
+    gpu::gles2::GLES2Interface* gl;
+    class GrContext* gr_context;
+  };
   // 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,
              SkXfermode::Mode mode,
-             VideoRotation video_rotation);
+             VideoRotation video_rotation,
+             Context3DProvider* context_provider);
 
   // Copy |video_frame| on |canvas|.
   void Copy(media::VideoFrame* video_frame, SkCanvas* canvas);
 
+  static void CopyVideoFrameToTexture(gpu::gles2::GLES2Interface* gl,
+                                      media::VideoFrame* video_frame,
+                                      unsigned int texture,
+                                      unsigned int level,
+                                      unsigned int internal_format,
+                                      unsigned int type,
+                                      bool premultiply_alpha,
+                                      bool flip_y);
+
  private:
+  void CleanUpTemporaryBuffers();
+
   // An RGB bitmap and corresponding timestamp of the previously converted
   // video frame data.
   SkBitmap last_frame_;
   base::TimeDelta last_frame_timestamp_;
+  // It's possible to be used by accelerated client and non-accelerated client.
+  SkBitmap accelerated_last_frame_;

[rileya (GONE FROM CHROMIUM), 2014/08/27 20:30:50]

If there are multiple separate hardware accelerated canvases (presumably on
separate Ganesh/GL contexts) painting frames from SkCanvasVideoRenderer at once,
couldn't there be issues with sharing this texture?

I'm not terribly familiar with the Blink/Ganesh integration, so I may be off
base here, but this seems fishy...

+  base::TimeDelta accelerated_last_frame_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_