Refactor scaling.

webrtc/common_video/libyuv/scaler.cc

Index: webrtc/common_video/libyuv/scaler.cc
diff --git a/webrtc/common_video/libyuv/scaler.cc b/webrtc/common_video/libyuv/scaler.cc
deleted file mode 100644
index 6e683c003b4d17e39985fca0475fe9bcbbd55cea..0000000000000000000000000000000000000000
--- a/webrtc/common_video/libyuv/scaler.cc
+++ /dev/null
@@ -1,116 +0,0 @@
-/*
- *  Copyright (c) 2012 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.
- */
-
-#include "webrtc/common_video/libyuv/include/scaler.h"
-
-#include <algorithm>
-
-// NOTE(ajm): Path provided by gyp.
-#include "libyuv.h"  // NOLINT
-
-namespace webrtc {
-
-Scaler::Scaler()
-    : method_(kScaleBox),
-      src_width_(0),
-      src_height_(0),
-      dst_width_(0),
-      dst_height_(0),
-      set_(false) {}
-
-Scaler::~Scaler() {}
-
-int Scaler::Set(int src_width, int src_height,
-                int dst_width, int dst_height,
-                VideoType src_video_type, VideoType dst_video_type,
-                ScaleMethod method) {
-  set_ = false;
-  if (src_width < 1 || src_height < 1 || dst_width < 1 || dst_height < 1)
-    return -1;
-
-  if (!SupportedVideoType(src_video_type, dst_video_type))
-    return -1;
-
-  src_width_ = src_width;
-  src_height_ = src_height;
-  dst_width_ = dst_width;
-  dst_height_ = dst_height;
-  method_ = method;
-  set_ = true;
-  return 0;
-}
-
-// TODO(nisse): Should work with VideoFrameBuffer instead.
-int Scaler::Scale(const VideoFrame& src_frame, VideoFrame* dst_frame) {
-  assert(dst_frame);
-  if (src_frame.IsZeroSize())
-    return -1;
-  if (!set_)
-    return -2;
-
-  // Making sure that destination frame is of sufficient size.
-  dst_frame->set_video_frame_buffer(
-      buffer_pool_.CreateBuffer(dst_width_, dst_height_));
-
-  // We want to preserve aspect ratio instead of stretching the frame.
-  // Therefore, we need to crop the source frame. Calculate the largest center
-  // aligned region of the source frame that can be used.
-  const int cropped_src_width =
-      std::min(src_width_, dst_width_ * src_height_ / dst_height_);
-  const int cropped_src_height =
-      std::min(src_height_, dst_height_ * src_width_ / dst_width_);
-  // Make sure the offsets are even to avoid rounding errors for the U/V planes.
-  const int src_offset_x = ((src_width_ - cropped_src_width) / 2) & ~1;
-  const int src_offset_y = ((src_height_ - cropped_src_height) / 2) & ~1;
-
-  const uint8_t* y_ptr =
-      src_frame.video_frame_buffer()->DataY() +
-      src_offset_y * src_frame.video_frame_buffer()->StrideY() +
-      src_offset_x;
-  const uint8_t* u_ptr =
-      src_frame.video_frame_buffer()->DataU() +
-      src_offset_y / 2 * src_frame.video_frame_buffer()->StrideU() +
-      src_offset_x / 2;
-  const uint8_t* v_ptr =
-      src_frame.video_frame_buffer()->DataV() +
-      src_offset_y / 2 * src_frame.video_frame_buffer()->StrideV() +
-      src_offset_x / 2;
-
-  return libyuv::I420Scale(
-      y_ptr,
-      src_frame.video_frame_buffer()->StrideY(),
-      u_ptr,
-      src_frame.video_frame_buffer()->StrideU(),
-      v_ptr,
-      src_frame.video_frame_buffer()->StrideV(),
-      cropped_src_width, cropped_src_height,
-      dst_frame->video_frame_buffer()->MutableDataY(),
-      dst_frame->video_frame_buffer()->StrideY(),
-      dst_frame->video_frame_buffer()->MutableDataU(),
-      dst_frame->video_frame_buffer()->StrideU(),
-      dst_frame->video_frame_buffer()->MutableDataV(),
-      dst_frame->video_frame_buffer()->StrideV(),
-      dst_width_, dst_height_,
-      libyuv::FilterMode(method_));
-}
-
-bool Scaler::SupportedVideoType(VideoType src_video_type,
-                                VideoType dst_video_type) {
-  if (src_video_type != dst_video_type)
-    return false;
-
-  if ((src_video_type == kI420) || (src_video_type == kIYUV) ||
-      (src_video_type == kYV12))
-    return true;
-
-  return false;
-}
-
-}  // namespace webrtc