Refactor scaling.

webrtc/common_video/libyuv/include/scaler.h

-/*
- *  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.
- */
-
-/*
- * Interface to the LibYuv scaling functionality
- */
-
-#ifndef WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_SCALER_H_
-#define WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_SCALER_H_
-
-#include "webrtc/common_video/include/i420_buffer_pool.h"
-#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
-#include "webrtc/typedefs.h"
-#include "webrtc/video_frame.h"
-
-namespace webrtc {
-
-// Supported scaling types
-enum ScaleMethod {
-  kScalePoint,  // no interpolation
-  kScaleBilinear,
-  kScaleBox
-};
-
-class Scaler {
- public:
-  Scaler();
-  ~Scaler();
-
-  // Set interpolation properties:
-  //
-  // Return value: 0 - OK
-  //              -1 - parameter error
-  int Set(int src_width, int src_height,
-          int dst_width, int dst_height,
-          VideoType src_video_type, VideoType dst_video_type,
-          ScaleMethod method);
-
-  // Scale frame
-  // Memory is allocated by this object and recycled using |buffer_pool_|.
-  // Return value: 0 - OK,
-  //               -1 - parameter error
-  //               -2 - scaler not set
-  int Scale(const VideoFrame& src_frame, VideoFrame* dst_frame);
-
- private:
-  // Determine if the VideoTypes are currently supported.
-  bool SupportedVideoType(VideoType src_video_type,
-                          VideoType dst_video_type);
-
-  ScaleMethod   method_;
-  int           src_width_;
-  int           src_height_;
-  int           dst_width_;
-  int           dst_height_;
-  bool          set_;
-  I420BufferPool buffer_pool_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_SCALER_H_