media: Use libyuv::CopyPlane instead of memcpy.

media/video/gpu_memory_buffer_video_frame_pool.cc

 // Copyright 2015 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.
 
 #include "media/video/gpu_memory_buffer_video_frame_pool.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include <algorithm>
@@ skipping 219 matching lines @@
                           int source_stride,
                           uint8* output,
                           int dest_stride,
                           const base::Closure& done) {
   TRACE_EVENT2("media", "CopyRowsToI420Buffer", "bytes_per_row", bytes_per_row,
                "rows", rows);
   if (output) {
     DCHECK_NE(dest_stride, 0);
     DCHECK_LE(bytes_per_row, std::abs(dest_stride));
     DCHECK_LE(bytes_per_row, source_stride);
-    for (int row = first_row; row < first_row + rows; ++row) {
-      memcpy(output + dest_stride * row, source + source_stride * row,
-             bytes_per_row);
-    }
+
+    libyuv::CopyPlane(source + source_stride * first_row, source_stride,
+                      output + dest_stride * first_row, dest_stride,
+                      bytes_per_row, rows);
   }
   done.Run();
 }
 
 void CopyRowsToNV12Buffer(int first_row,
                           int rows,
                           int bytes_per_row,
                           const scoped_refptr<VideoFrame>& source_frame,
                           uint8* dest_y,
                           int dest_stride_y,
@@ skipping 443 matching lines @@
 }
 
 void GpuMemoryBufferVideoFramePool::MaybeCreateHardwareFrame(
     const scoped_refptr<VideoFrame>& video_frame,
     const FrameReadyCB& frame_ready_cb) {
   DCHECK(video_frame);
   pool_impl_->CreateHardwareFrame(video_frame, frame_ready_cb);
 }
 
 }  // namespace media