New static method I420Buffer::SetToBlack.

webrtc/common_video/video_frame_buffer.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 182 matching lines @@
                              buffer->DataU(), buffer->StrideU(),
                              buffer->DataV(), buffer->StrideV(),
                              copy->MutableDataY(), copy->StrideY(),
                              copy->MutableDataU(), copy->StrideU(),
                              copy->MutableDataV(), copy->StrideV(),
                              width, height) == 0);
 
   return copy;
 }
 
+void I420Buffer::SetToBlack(
+      const rtc::scoped_refptr<VideoFrameBuffer>& buffer) {
+  RTC_CHECK(libyuv::I420Rect(buffer->MutableDataY(), buffer->StrideY(),
+                             buffer->MutableDataU(), buffer->StrideU(),
+                             buffer->MutableDataV(), buffer->StrideV(),
+                             0, 0,
+                             buffer->width(), buffer->height(),
+                             0, 128, 128) == 0);
+}
+
 NativeHandleBuffer::NativeHandleBuffer(void* native_handle,
                                        int width,
                                        int height)
     : native_handle_(native_handle), width_(width), height_(height) {
   RTC_DCHECK(native_handle != nullptr);
   RTC_DCHECK_GT(width, 0);
   RTC_DCHECK_GT(height, 0);
 }
 
 int NativeHandleBuffer::width() const {
@@ skipping 120 matching lines @@
                            buffer->StrideV() * uv_offset_y + uv_offset_x;
   return new rtc::RefCountedObject<WrappedI420Buffer>(
       cropped_width, cropped_height,
       y_plane, buffer->StrideY(),
       u_plane, buffer->StrideU(),
       v_plane, buffer->StrideV(),
       rtc::KeepRefUntilDone(buffer));
 }
 
 }  // namespace webrtc