libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_scale.h

 /*
  *  Copyright (c) 2013 The WebM 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 VP9_COMMON_VP9_SCALE_H_
 #define VP9_COMMON_VP9_SCALE_H_
 
 #include "vp9/common/vp9_mv.h"
 #include "vp9/common/vp9_convolve.h"
 
 #define REF_SCALE_SHIFT 14
 #define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
 #define REF_INVALID_SCALE -1
 
-struct scale_factors {
+struct scale_factors;
+struct scale_factors_common {
   int x_scale_fp;   // horizontal fixed point scale factor
   int y_scale_fp;   // vertical fixed point scale factor
-  int x_offset_q4;
   int x_step_q4;
-  int y_offset_q4;
   int y_step_q4;
 
-  int (*scale_value_x)(int val, const struct scale_factors *scale);
-  int (*scale_value_y)(int val, const struct scale_factors *scale);
+  int (*scale_value_x)(int val, const struct scale_factors_common *sfc);
+  int (*scale_value_y)(int val, const struct scale_factors_common *sfc);
   void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
   MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
 
   convolve_fn_t predict[2][2][2];  // horiz, vert, avg
 };
 
+struct scale_factors {
+  int x_offset_q4;
+  int y_offset_q4;
+  const struct scale_factors_common *sfc;
+};
+
 void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
+                                       struct scale_factors_common *scale_comm,
                                        int other_w, int other_h,
                                        int this_w, int this_h);
 
-static int vp9_is_valid_scale(const struct scale_factors *sf) {
-  return sf->x_scale_fp != REF_INVALID_SCALE &&
-         sf->y_scale_fp != REF_INVALID_SCALE;
+static int vp9_is_valid_scale(const struct scale_factors_common *sfc) {
+  return sfc->x_scale_fp != REF_INVALID_SCALE &&
+         sfc->y_scale_fp != REF_INVALID_SCALE;
 }
 
-static int vp9_is_scaled(const struct scale_factors *sf) {
-  return sf->x_scale_fp != REF_NO_SCALE ||
-         sf->y_scale_fp != REF_NO_SCALE;
+static int vp9_is_scaled(const struct scale_factors_common *sfc) {
+  return sfc->x_scale_fp != REF_NO_SCALE ||
+         sfc->y_scale_fp != REF_NO_SCALE;
 }
 
-#endif  //  VP9_COMMON_VP9_SCALE_H_
+#endif  // VP9_COMMON_VP9_SCALE_H_