New static I420Buffer::Rotate method, to replace GetCopyWithRotationApplied.

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 198 matching lines @@
   CropAndScaleFrom(
       src,
       (src->width() - crop_width) / 2, (src->height() - crop_height) / 2,
       crop_width, crop_height);
 }
 
 void I420Buffer::ScaleFrom(const rtc::scoped_refptr<VideoFrameBuffer>& src) {
   CropAndScaleFrom(src, 0, 0, src->width(), src->height());
 }
 
+// static
 rtc::scoped_refptr<I420Buffer> I420Buffer::CopyKeepStride(
     const rtc::scoped_refptr<VideoFrameBuffer>& source) {
   int width = source->width();
   int height = source->height();
   int stride_y = source->StrideY();
   int stride_u = source->StrideU();
   int stride_v = source->StrideV();
   rtc::scoped_refptr<I420Buffer> target =
       I420Buffer::Create(width, height, stride_y, stride_u, stride_v);
   RTC_CHECK(libyuv::I420Copy(source->DataY(), stride_y,
                              source->DataU(), stride_u,
                              source->DataV(), stride_v,
                              target->MutableDataY(), stride_y,
                              target->MutableDataU(), stride_u,
                              target->MutableDataV(), stride_v,
                              width, height) == 0);
 
   return target;
 }
 
+// static
+rtc::scoped_refptr<VideoFrameBuffer> I420Buffer::Rotate(
+    const rtc::scoped_refptr<VideoFrameBuffer>& src,
+    VideoRotation rotation) {
+  RTC_DCHECK(src->DataY());
+  RTC_DCHECK(src->DataU());
+  RTC_DCHECK(src->DataV());
+
+  if (rotation == webrtc::kVideoRotation_0) {
+    return src;
+  }
+
+  int rotated_width = src->width();
+  int rotated_height = src->height();
+  if (rotation == webrtc::kVideoRotation_90 ||
+      rotation == webrtc::kVideoRotation_270) {
+    std::swap(rotated_width, rotated_height);
+  }
+
+  rtc::scoped_refptr<webrtc::I420Buffer> buffer =
+      I420Buffer::Create(rotated_width, rotated_height);
+
+  int res = libyuv::I420Rotate(
+      src->DataY(), src->StrideY(),
+      src->DataU(), src->StrideU(),
+      src->DataV(), src->StrideV(),
+      buffer->MutableDataY(), buffer->StrideY(), buffer->MutableDataU(),
+      buffer->StrideU(), buffer->MutableDataV(), buffer->StrideV(),
+      src->width(), src->height(),
+      static_cast<libyuv::RotationMode>(rotation));
+  RTC_DCHECK_EQ(res, 0);
+
+  return buffer;
+}
+
 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 89 matching lines @@
 void* WrappedI420Buffer::native_handle() const {
   return nullptr;
 }
 
 rtc::scoped_refptr<VideoFrameBuffer> WrappedI420Buffer::NativeToI420Buffer() {
   RTC_NOTREACHED();
   return nullptr;
 }
 
 }  // namespace webrtc