webgl: optimize webgl.texSubImage2D(video) path.

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index 53119fe3ff12be25683882e8e86a8d2b462cac81..a5de6808720033529fa1304109711af228bf0ad2 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -422,6 +422,23 @@ bool WebMediaPlayerMS::copyVideoTextureToPlatformTexture(
     bool premultiply_alpha,
     bool flip_y) {
   TRACE_EVENT0("media", "WebMediaPlayerMS:copyVideoTextureToPlatformTexture");
+  // TODO(dshwang): not include gl2.h because this method will be removed soon.
+  const unsigned int GL_TEXTURE_2D = 0x0DE1;
+  return copyVideoTextureToPlatformTexture(web_graphics_context, GL_TEXTURE_2D,
+                                           texture, internal_format, type, 0,
+                                           premultiply_alpha, flip_y);
+}
+
+bool WebMediaPlayerMS::copyVideoTextureToPlatformTexture(
+    blink::WebGraphicsContext3D* web_graphics_context,
+    unsigned int target,
+    unsigned int texture,
+    unsigned int internal_format,
+    unsigned int type,
+    int level,
+    bool premultiply_alpha,
+    bool flip_y) {
+  TRACE_EVENT0("media", "WebMediaPlayerMS:copyVideoTextureToPlatformTexture");
   DCHECK(thread_checker_.CalledOnValidThread());
 
   scoped_refptr<media::VideoFrame> video_frame;
@@ -441,8 +458,43 @@ bool WebMediaPlayerMS::copyVideoTextureToPlatformTexture(
       static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
           ->GetGLInterface();
   media::SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
-      gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
-      flip_y);
+      gl, video_frame.get(), target, texture, internal_format, type, level,
+      premultiply_alpha, flip_y);
+  return true;
+}
+
+bool WebMediaPlayerMS::copyVideoSubTextureToPlatformTexture(
+    blink::WebGraphicsContext3D* web_graphics_context,
+    unsigned int target,
+    unsigned int texture,
+    int level,
+    int xoffset,
+    int yoffset,
+    bool premultiply_alpha,
+    bool flip_y) {
+  TRACE_EVENT0("media",
+               "WebMediaPlayerMS:copyVideoSubTextureToPlatformTexture");
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  scoped_refptr<media::VideoFrame> video_frame;
+  {
+    base::AutoLock auto_lock(current_frame_lock_);
+    video_frame = current_frame_;
+  }
+
+  if (!video_frame.get() || video_frame->HasTextures() ||
+      media::VideoFrame::NumPlanes(video_frame->format()) != 1) {
+    return false;
+  }
+
+  // TODO(dshwang): need more elegant way to convert WebGraphicsContext3D to
+  // GLES2Interface.
+  gpu::gles2::GLES2Interface* gl =
+      static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
+          ->GetGLInterface();
+  media::SkCanvasVideoRenderer::CopySubVideoFrameSingleTextureToGLTexture(
+      gl, video_frame.get(), target, texture, level, xoffset, yoffset,
+      premultiply_alpha, flip_y);
   return true;
 }