text: /*
   *  Copyright 2011 The LibYuv 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.
   */
  
  #ifndef INCLUDE_LIBYUV_SCALE_H_  // NOLINT
  #define INCLUDE_LIBYUV_SCALE_H_
  
  #include "basic_types.h"
  
  #ifdef __cplusplus
  namespace libyuv {
  extern "C" {
  #endif
  
  // Supported filtering.
  typedef enum FilterMode {
    kFilterNone = 0,  // Point sample; Fastest.
    kFilterLinear = 1,  // Filter horizontally only.
    kFilterBilinear = 2,  // Faster than box, but lower quality scaling down.
    kFilterBox = 3  // Highest quality.
  } FilterModeEnum;
  
  // Scale a YUV plane.
  LIBYUV_API
  void ScalePlane(const uint8* src, int src_stride,
                  int src_width, int src_height,
                  uint8* dst, int dst_stride,
                  int dst_width, int dst_height,
                  enum FilterMode filtering);
  
  LIBYUV_API
  void ScalePlane_16(const uint16* src, int src_stride,
                     int src_width, int src_height,
                     uint16* dst, int dst_stride,
                     int dst_width, int dst_height,
                     enum FilterMode filtering);
  
  // Scales a YUV 4:2:0 image from the src width and height to the
  // dst width and height.
  // If filtering is kFilterNone, a simple nearest-neighbor algorithm is
  // used. This produces basic (blocky) quality at the fastest speed.
  // If filtering is kFilterBilinear, interpolation is used to produce a better
  // quality image, at the expense of speed.
  // If filtering is kFilterBox, averaging is used to produce ever better
  // quality image, at further expense of speed.
  // Returns 0 if successful.
  
  LIBYUV_API
  int I420Scale(const uint8* src_y, int src_stride_y,
                const uint8* src_u, int src_stride_u,
                const uint8* src_v, int src_stride_v,
                int src_width, int src_height,
                uint8* dst_y, int dst_stride_y,
                uint8* dst_u, int dst_stride_u,
                uint8* dst_v, int dst_stride_v,
                int dst_width, int dst_height,
                enum FilterMode filtering);
  
  LIBYUV_API
  int I420Scale_16(const uint16* src_y, int src_stride_y,
                   const uint16* src_u, int src_stride_u,
                   const uint16* src_v, int src_stride_v,
                   int src_width, int src_height,
                   uint16* dst_y, int dst_stride_y,
                   uint16* dst_u, int dst_stride_u,
                   uint16* dst_v, int dst_stride_v,
                   int dst_width, int dst_height,
                   enum FilterMode filtering);
  
  #ifdef __cplusplus
  // Legacy API.  Deprecated.
  LIBYUV_API
  int Scale(const uint8* src_y, const uint8* src_u, const uint8* src_v,
            int src_stride_y, int src_stride_u, int src_stride_v,
            int src_width, int src_height,
            uint8* dst_y, uint8* dst_u, uint8* dst_v,
            int dst_stride_y, int dst_stride_u, int dst_stride_v,
            int dst_width, int dst_height,
            LIBYUV_BOOL interpolate);
  
  // Legacy API.  Deprecated.
  LIBYUV_API
  int ScaleOffset(const uint8* src_i420, int src_width, int src_height,
                  uint8* dst_i420, int dst_width, int dst_height, int dst_yoffset,
                  LIBYUV_BOOL interpolate);
  
  // For testing, allow disabling of specialized scalers.
  LIBYUV_API
  void SetUseReferenceImpl(LIBYUV_BOOL use);
  #endif  // __cplusplus
  
  #ifdef __cplusplus
  }  // extern "C"
  }  // namespace libyuv
  #endif
  
  #endif  // INCLUDE_LIBYUV_SCALE_H_  NOLINT
  