webgl: optimize webgl.texSubImage2D(video) path.

media/blink/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_BLINK_SKCANVAS_VIDEO_RENDERER_H_
 #define MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
@@ skipping 48 matching lines @@
   static void ConvertVideoFrameToRGBPixels(const media::VideoFrame* video_frame,
                                            void* rgb_pixels,
                                            size_t row_bytes);
 
   // 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 CopyVideoFrameSingleTextureToGLTexture(
       gpu::gles2::GLES2Interface* gl,
       VideoFrame* video_frame,
+      unsigned int target,
       unsigned int texture,
       unsigned int internal_format,
       unsigned int type,
+      int level,
+      bool premultiply_alpha,
+      bool flip_y);
+  static void CopySubVideoFrameSingleTextureToGLTexture(

[oetuaho-nv, 2015/10/01 07:46:21]

Same naming issue here. Would rather use
"CopyVideoFrameSingleTextureToGLSubTexture".

[dshwang, 2015/10/21 16:12:15]

ditto.

+      gpu::gles2::GLES2Interface* gl,
+      VideoFrame* video_frame,
+      unsigned int target,
+      unsigned int texture,
+      int level,
+      int xoffset,
+      int yoffset,
       bool premultiply_alpha,
       bool flip_y);
 
  private:
   void ResetCache();
 
   // Last image used to draw to the canvas.
   skia::RefPtr<SkImage> last_image_;
   // Timestamp of the videoframe used to generate |last_image_|.
   base::TimeDelta last_timestamp_ = media::kNoTimestamp();
   // If |last_image_| is not used for a while, it's deleted to save memory.
   base::DelayTimer<SkCanvasVideoRenderer> last_image_deleting_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_