media: Optimize HW Video to 2D Canvas copy.

media/filters/skcanvas_video_renderer.h

Index: media/filters/skcanvas_video_renderer.h
diff --git a/media/filters/skcanvas_video_renderer.h b/media/filters/skcanvas_video_renderer.h
index 1e81d316f56555034fffdbfef72325d252a6944b..81a11eb6b900b39eaffeec81681ca9b3a07f69db 100644
--- a/media/filters/skcanvas_video_renderer.h
+++ b/media/filters/skcanvas_video_renderer.h
@@ -10,12 +10,12 @@
 #include "base/timer/timer.h"
 #include "media/base/media_export.h"
 #include "media/base/video_rotation.h"
+#include "media/filters/context_3d_provider.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/rect.h"
 
-class SkCanvas;
-
 namespace media {
 
 class VideoFrame;
@@ -30,6 +30,8 @@ class MEDIA_EXPORT 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 or |canvas|
+  // is ganeshed, |context_provider| must be provided.

[scherkus (not reviewing), 2014/11/13 18:35:02]

can we DCHECK this inside the .cc?

   //
   // Black will be painted on |canvas| if |video_frame| is null.
   void Paint(const scoped_refptr<VideoFrame>& video_frame,
@@ -37,11 +39,24 @@ class MEDIA_EXPORT SkCanvasVideoRenderer {
              const gfx::RectF& dest_rect,
              uint8 alpha,
              SkXfermode::Mode mode,
-             VideoRotation video_rotation);
+             VideoRotation video_rotation,
+             const Context3DProvider& context_provider);
 
   // Copy |video_frame| on |canvas|.
   void Copy(const scoped_refptr<VideoFrame>&, SkCanvas* canvas);
 
+  // Copy the contents of texture of |video_frame| to texture |texture|.
+  // |level|, |internal_format|, |type| specify target texture |texture|.
+  // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
+  static void CopyVideoFrameTextureToGLTexture(gpu::gles2::GLES2Interface* gl,
+                                               VideoFrame* video_frame,
+                                               unsigned int texture,
+                                               unsigned int level,
+                                               unsigned int internal_format,
+                                               unsigned int type,
+                                               bool premultiply_alpha,
+                                               bool flip_y);
+
  private:
   void ResetLastFrame();
   void ResetAcceleratedLastFrame();