text: /*
   * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   *
   * This source code is subject to the terms of the BSD 2 Clause License and
   * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   * was not distributed with this source code in the LICENSE file, you can
   * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   * Media Patent License 1.0 was not distributed with this source code in the
   * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
   */
  
  #include <assert.h>
  #include <stdio.h>
  #include <limits.h>
  
  #include "config/aom_config.h"
  #include "config/aom_dsp_rtcd.h"
  #include "config/aom_scale_rtcd.h"
  
  #include "aom/aom_integer.h"
  #include "aom_dsp/blend.h"
  
  #include "av1/common/av1_common_int.h"
  #include "av1/common/blockd.h"
  #include "av1/common/mvref_common.h"
  #include "av1/common/obmc.h"
  #include "av1/common/reconinter.h"
  #include "av1/common/reconintra.h"
  
  // This function will determine whether or not to create a warped
  // prediction.
  int av1_allow_warp(const MB_MODE_INFO *const mbmi,
                     const WarpTypesAllowed *const warp_types,
                     const WarpedMotionParams *const gm_params,
                     int build_for_obmc, const struct scale_factors *const sf,
                     WarpedMotionParams *final_warp_params) {
    // Note: As per the spec, we must test the fixed point scales here, which are
    // at a higher precision (1 << 14) than the xs and ys in subpel_params (that
    // have 1 << 10 precision).
    if (av1_is_scaled(sf)) return 0;
  
    if (final_warp_params != NULL) *final_warp_params = default_warp_params;
  
    if (build_for_obmc) return 0;
  
    if (warp_types->local_warp_allowed && !mbmi->wm_params.invalid) {
      if (final_warp_params != NULL)
        memcpy(final_warp_params, &mbmi->wm_params, sizeof(*final_warp_params));
      return 1;
    } else if (warp_types->global_warp_allowed && !gm_params->invalid) {
      if (final_warp_params != NULL)
        memcpy(final_warp_params, gm_params, sizeof(*final_warp_params));
      return 1;
    }
  
    return 0;
  }
  
  void av1_init_inter_params(InterPredParams *inter_pred_params, int block_width,
                             int block_height, int pix_row, int pix_col,
                             int subsampling_x, int subsampling_y, int bit_depth,
                             int use_hbd_buf, int is_intrabc,
                             const struct scale_factors *sf,
                             const struct buf_2d *ref_buf,
                             int_interpfilters interp_filters) {
    inter_pred_params->block_width = block_width;
    inter_pred_params->block_height = block_height;
    inter_pred_params->pix_row = pix_row;
    inter_pred_params->pix_col = pix_col;
    inter_pred_params->subsampling_x = subsampling_x;
    inter_pred_params->subsampling_y = subsampling_y;
    inter_pred_params->bit_depth = bit_depth;
    inter_pred_params->use_hbd_buf = use_hbd_buf;
    inter_pred_params->is_intrabc = is_intrabc;
    inter_pred_params->scale_factors = sf;
    inter_pred_params->ref_frame_buf = *ref_buf;
    inter_pred_params->mode = TRANSLATION_PRED;
    inter_pred_params->comp_mode = UNIFORM_SINGLE;
  
    if (is_intrabc) {
      inter_pred_params->interp_filter_params[0] = &av1_intrabc_filter_params;
      inter_pred_params->interp_filter_params[1] = &av1_intrabc_filter_params;
    } else {
      inter_pred_params->interp_filter_params[0] =
          av1_get_interp_filter_params_with_block_size(
              interp_filters.as_filters.x_filter, block_width);
      inter_pred_params->interp_filter_params[1] =
          av1_get_interp_filter_params_with_block_size(
              interp_filters.as_filters.y_filter, block_height);
    }
  }
  
  void av1_init_comp_mode(InterPredParams *inter_pred_params) {
    inter_pred_params->comp_mode = UNIFORM_COMP;
  }
  
  void av1_init_warp_params(InterPredParams *inter_pred_params,
                            const WarpTypesAllowed *warp_types, int ref,
                            const MACROBLOCKD *xd, const MB_MODE_INFO *mi) {
    if (inter_pred_params->block_height < 8 || inter_pred_params->block_width < 8)
      return;
  
    if (xd->cur_frame_force_integer_mv) return;
  
    if (av1_allow_warp(mi, warp_types, &xd->global_motion[mi->ref_frame[ref]], 0,
                       inter_pred_params->scale_factors,
                       &inter_pred_params->warp_params))
      inter_pred_params->mode = WARP_PRED;
  }
  
  void av1_make_inter_predictor(const uint8_t *src, int src_stride, uint8_t *dst,
                                int dst_stride,
                                InterPredParams *inter_pred_params,
                                const SubpelParams *subpel_params) {
    assert(IMPLIES(inter_pred_params->conv_params.is_compound,
                   inter_pred_params->conv_params.dst != NULL));
  
    if (inter_pred_params->mode == TRANSLATION_PRED) {
  #if CONFIG_AV1_HIGHBITDEPTH
      if (inter_pred_params->use_hbd_buf) {
        highbd_inter_predictor(src, src_stride, dst, dst_stride, subpel_params,
                               inter_pred_params->block_width,
                               inter_pred_params->block_height,
                               &inter_pred_params->conv_params,
                               inter_pred_params->interp_filter_params,
                               inter_pred_params->bit_depth);
      } else {
        inter_predictor(src, src_stride, dst, dst_stride, subpel_params,
                        inter_pred_params->block_width,
                        inter_pred_params->block_height,
                        &inter_pred_params->conv_params,
                        inter_pred_params->interp_filter_params);
      }
  #else
      inter_predictor(src, src_stride, dst, dst_stride, subpel_params,
                      inter_pred_params->block_width,
                      inter_pred_params->block_height,
                      &inter_pred_params->conv_params,
                      inter_pred_params->interp_filter_params);
  #endif
    }
  #if !CONFIG_REALTIME_ONLY
    // TODO(jingning): av1_warp_plane() can be further cleaned up.
    else if (inter_pred_params->mode == WARP_PRED) {
      av1_warp_plane(
          &inter_pred_params->warp_params, inter_pred_params->use_hbd_buf,
          inter_pred_params->bit_depth, inter_pred_params->ref_frame_buf.buf0,
          inter_pred_params->ref_frame_buf.width,
          inter_pred_params->ref_frame_buf.height,
          inter_pred_params->ref_frame_buf.stride, dst,
          inter_pred_params->pix_col, inter_pred_params->pix_row,
          inter_pred_params->block_width, inter_pred_params->block_height,
          dst_stride, inter_pred_params->subsampling_x,
          inter_pred_params->subsampling_y, &inter_pred_params->conv_params);
    }
  #endif
  }
  
  static const uint8_t wedge_master_oblique_odd[MASK_MASTER_SIZE] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  2,  6,  18,
    37, 53, 60, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
  };
  static const uint8_t wedge_master_oblique_even[MASK_MASTER_SIZE] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  4,  11, 27,
    46, 58, 62, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
  };
  static const uint8_t wedge_master_vertical[MASK_MASTER_SIZE] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  2,  7,  21,
    43, 57, 62, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
  };
  
  static AOM_INLINE void shift_copy(const uint8_t *src, uint8_t *dst, int shift,
                                    int width) {
    if (shift >= 0) {
      memcpy(dst + shift, src, width - shift);
      memset(dst, src[0], shift);
    } else {
      shift = -shift;
      memcpy(dst, src + shift, width - shift);
      memset(dst + width - shift, src[width - 1], shift);
    }
  }
  
  /* clang-format off */
  DECLARE_ALIGNED(16, static uint8_t,
                  wedge_signflip_lookup[BLOCK_SIZES_ALL][MAX_WEDGE_TYPES]) = {
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, },
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, },
    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, },
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },  // not used
  };
  /* clang-format on */
  
  // [negative][direction]
  DECLARE_ALIGNED(
      16, static uint8_t,
      wedge_mask_obl[2][WEDGE_DIRECTIONS][MASK_MASTER_SIZE * MASK_MASTER_SIZE]);
  
  // 4 * MAX_WEDGE_SQUARE is an easy to compute and fairly tight upper bound
  // on the sum of all mask sizes up to an including MAX_WEDGE_SQUARE.
  DECLARE_ALIGNED(16, static uint8_t,
                  wedge_mask_buf[2 * MAX_WEDGE_TYPES * 4 * MAX_WEDGE_SQUARE]);
  
  DECLARE_ALIGNED(16, static uint8_t,
                  smooth_interintra_mask_buf[INTERINTRA_MODES][BLOCK_SIZES_ALL]
                                            [MAX_WEDGE_SQUARE]);
  
  static wedge_masks_type wedge_masks[BLOCK_SIZES_ALL][2];
  
  static const wedge_code_type wedge_codebook_16_hgtw[16] = {
    { WEDGE_OBLIQUE27, 4, 4 },  { WEDGE_OBLIQUE63, 4, 4 },
    { WEDGE_OBLIQUE117, 4, 4 }, { WEDGE_OBLIQUE153, 4, 4 },
    { WEDGE_HORIZONTAL, 4, 2 }, { WEDGE_HORIZONTAL, 4, 4 },
    { WEDGE_HORIZONTAL, 4, 6 }, { WEDGE_VERTICAL, 4, 4 },
    { WEDGE_OBLIQUE27, 4, 2 },  { WEDGE_OBLIQUE27, 4, 6 },
    { WEDGE_OBLIQUE153, 4, 2 }, { WEDGE_OBLIQUE153, 4, 6 },
    { WEDGE_OBLIQUE63, 2, 4 },  { WEDGE_OBLIQUE63, 6, 4 },
    { WEDGE_OBLIQUE117, 2, 4 }, { WEDGE_OBLIQUE117, 6, 4 },
  };
  
  static const wedge_code_type wedge_codebook_16_hltw[16] = {
    { WEDGE_OBLIQUE27, 4, 4 },  { WEDGE_OBLIQUE63, 4, 4 },
    { WEDGE_OBLIQUE117, 4, 4 }, { WEDGE_OBLIQUE153, 4, 4 },
    { WEDGE_VERTICAL, 2, 4 },   { WEDGE_VERTICAL, 4, 4 },
    { WEDGE_VERTICAL, 6, 4 },   { WEDGE_HORIZONTAL, 4, 4 },
    { WEDGE_OBLIQUE27, 4, 2 },  { WEDGE_OBLIQUE27, 4, 6 },
    { WEDGE_OBLIQUE153, 4, 2 }, { WEDGE_OBLIQUE153, 4, 6 },
    { WEDGE_OBLIQUE63, 2, 4 },  { WEDGE_OBLIQUE63, 6, 4 },
    { WEDGE_OBLIQUE117, 2, 4 }, { WEDGE_OBLIQUE117, 6, 4 },
  };
  
  static const wedge_code_type wedge_codebook_16_heqw[16] = {
    { WEDGE_OBLIQUE27, 4, 4 },  { WEDGE_OBLIQUE63, 4, 4 },
    { WEDGE_OBLIQUE117, 4, 4 }, { WEDGE_OBLIQUE153, 4, 4 },
    { WEDGE_HORIZONTAL, 4, 2 }, { WEDGE_HORIZONTAL, 4, 6 },
    { WEDGE_VERTICAL, 2, 4 },   { WEDGE_VERTICAL, 6, 4 },
    { WEDGE_OBLIQUE27, 4, 2 },  { WEDGE_OBLIQUE27, 4, 6 },
    { WEDGE_OBLIQUE153, 4, 2 }, { WEDGE_OBLIQUE153, 4, 6 },
    { WEDGE_OBLIQUE63, 2, 4 },  { WEDGE_OBLIQUE63, 6, 4 },
    { WEDGE_OBLIQUE117, 2, 4 }, { WEDGE_OBLIQUE117, 6, 4 },
  };
  
  const wedge_params_type av1_wedge_params_lookup[BLOCK_SIZES_ALL] = {
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { MAX_WEDGE_TYPES, wedge_codebook_16_heqw, wedge_signflip_lookup[BLOCK_8X8],
      wedge_masks[BLOCK_8X8] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hgtw, wedge_signflip_lookup[BLOCK_8X16],
      wedge_masks[BLOCK_8X16] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hltw, wedge_signflip_lookup[BLOCK_16X8],
      wedge_masks[BLOCK_16X8] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_heqw, wedge_signflip_lookup[BLOCK_16X16],
      wedge_masks[BLOCK_16X16] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hgtw, wedge_signflip_lookup[BLOCK_16X32],
      wedge_masks[BLOCK_16X32] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hltw, wedge_signflip_lookup[BLOCK_32X16],
      wedge_masks[BLOCK_32X16] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_heqw, wedge_signflip_lookup[BLOCK_32X32],
      wedge_masks[BLOCK_32X32] },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hgtw, wedge_signflip_lookup[BLOCK_8X32],
      wedge_masks[BLOCK_8X32] },
    { MAX_WEDGE_TYPES, wedge_codebook_16_hltw, wedge_signflip_lookup[BLOCK_32X8],
      wedge_masks[BLOCK_32X8] },
    { 0, NULL, NULL, NULL },
    { 0, NULL, NULL, NULL },
  };
  
  static const uint8_t *get_wedge_mask_inplace(int wedge_index, int neg,
                                               BLOCK_SIZE sb_type) {
    const uint8_t *master;
    const int bh = block_size_high[sb_type];
    const int bw = block_size_wide[sb_type];
    const wedge_code_type *a =
        av1_wedge_params_lookup[sb_type].codebook + wedge_index;
    int woff, hoff;
    const uint8_t wsignflip =
        av1_wedge_params_lookup[sb_type].signflip[wedge_index];
  
    assert(wedge_index >= 0 && wedge_index < get_wedge_types_lookup(sb_type));
    woff = (a->x_offset * bw) >> 3;
    hoff = (a->y_offset * bh) >> 3;
    master = wedge_mask_obl[neg ^ wsignflip][a->direction] +
             MASK_MASTER_STRIDE * (MASK_MASTER_SIZE / 2 - hoff) +
             MASK_MASTER_SIZE / 2 - woff;
    return master;
  }
  
  const uint8_t *av1_get_compound_type_mask(
      const INTERINTER_COMPOUND_DATA *const comp_data, BLOCK_SIZE sb_type) {
    (void)sb_type;
    switch (comp_data->type) {
      case COMPOUND_WEDGE:
        return av1_get_contiguous_soft_mask(comp_data->wedge_index,
                                            comp_data->wedge_sign, sb_type);
      default: return comp_data->seg_mask;
    }
  }
  
  static AOM_INLINE void diffwtd_mask_d16(
      uint8_t *mask, int which_inverse, int mask_base, const CONV_BUF_TYPE *src0,
      int src0_stride, const CONV_BUF_TYPE *src1, int src1_stride, int h, int w,
      ConvolveParams *conv_params, int bd) {
    int round =
        2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1 + (bd - 8);
    int i, j, m, diff;
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        diff = abs(src0[i * src0_stride + j] - src1[i * src1_stride + j]);
        diff = ROUND_POWER_OF_TWO(diff, round);
        m = clamp(mask_base + (diff / DIFF_FACTOR), 0, AOM_BLEND_A64_MAX_ALPHA);
        mask[i * w + j] = which_inverse ? AOM_BLEND_A64_MAX_ALPHA - m : m;
      }
    }
  }
  
  void av1_build_compound_diffwtd_mask_d16_c(
      uint8_t *mask, DIFFWTD_MASK_TYPE mask_type, const CONV_BUF_TYPE *src0,
      int src0_stride, const CONV_BUF_TYPE *src1, int src1_stride, int h, int w,
      ConvolveParams *conv_params, int bd) {
    switch (mask_type) {
      case DIFFWTD_38:
        diffwtd_mask_d16(mask, 0, 38, src0, src0_stride, src1, src1_stride, h, w,
                         conv_params, bd);
        break;
      case DIFFWTD_38_INV:
        diffwtd_mask_d16(mask, 1, 38, src0, src0_stride, src1, src1_stride, h, w,
                         conv_params, bd);
        break;
      default: assert(0);
    }
  }
  
  static AOM_INLINE void diffwtd_mask(uint8_t *mask, int which_inverse,
                                      int mask_base, const uint8_t *src0,
                                      int src0_stride, const uint8_t *src1,
                                      int src1_stride, int h, int w) {
    int i, j, m, diff;
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        diff =
            abs((int)src0[i * src0_stride + j] - (int)src1[i * src1_stride + j]);
        m = clamp(mask_base + (diff / DIFF_FACTOR), 0, AOM_BLEND_A64_MAX_ALPHA);
        mask[i * w + j] = which_inverse ? AOM_BLEND_A64_MAX_ALPHA - m : m;
      }
    }
  }
  
  void av1_build_compound_diffwtd_mask_c(uint8_t *mask,
                                         DIFFWTD_MASK_TYPE mask_type,
                                         const uint8_t *src0, int src0_stride,
                                         const uint8_t *src1, int src1_stride,
                                         int h, int w) {
    switch (mask_type) {
      case DIFFWTD_38:
        diffwtd_mask(mask, 0, 38, src0, src0_stride, src1, src1_stride, h, w);
        break;
      case DIFFWTD_38_INV:
        diffwtd_mask(mask, 1, 38, src0, src0_stride, src1, src1_stride, h, w);
        break;
      default: assert(0);
    }
  }
  
  static AOM_FORCE_INLINE void diffwtd_mask_highbd(
      uint8_t *mask, int which_inverse, int mask_base, const uint16_t *src0,
      int src0_stride, const uint16_t *src1, int src1_stride, int h, int w,
      const unsigned int bd) {
    assert(bd >= 8);
    if (bd == 8) {
      if (which_inverse) {
        for (int i = 0; i < h; ++i) {
          for (int j = 0; j < w; ++j) {
            int diff = abs((int)src0[j] - (int)src1[j]) / DIFF_FACTOR;
            unsigned int m = negative_to_zero(mask_base + diff);
            m = AOMMIN(m, AOM_BLEND_A64_MAX_ALPHA);
            mask[j] = AOM_BLEND_A64_MAX_ALPHA - m;
          }
          src0 += src0_stride;
          src1 += src1_stride;
          mask += w;
        }
      } else {
        for (int i = 0; i < h; ++i) {
          for (int j = 0; j < w; ++j) {
            int diff = abs((int)src0[j] - (int)src1[j]) / DIFF_FACTOR;
            unsigned int m = negative_to_zero(mask_base + diff);
            m = AOMMIN(m, AOM_BLEND_A64_MAX_ALPHA);
            mask[j] = m;
          }
          src0 += src0_stride;
          src1 += src1_stride;
          mask += w;
        }
      }
    } else {
      const unsigned int bd_shift = bd - 8;
      if (which_inverse) {
        for (int i = 0; i < h; ++i) {
          for (int j = 0; j < w; ++j) {
            int diff =
                (abs((int)src0[j] - (int)src1[j]) >> bd_shift) / DIFF_FACTOR;
            unsigned int m = negative_to_zero(mask_base + diff);
            m = AOMMIN(m, AOM_BLEND_A64_MAX_ALPHA);
            mask[j] = AOM_BLEND_A64_MAX_ALPHA - m;
          }
          src0 += src0_stride;
          src1 += src1_stride;
          mask += w;
        }
      } else {
        for (int i = 0; i < h; ++i) {
          for (int j = 0; j < w; ++j) {
            int diff =
                (abs((int)src0[j] - (int)src1[j]) >> bd_shift) / DIFF_FACTOR;
            unsigned int m = negative_to_zero(mask_base + diff);
            m = AOMMIN(m, AOM_BLEND_A64_MAX_ALPHA);
            mask[j] = m;
          }
          src0 += src0_stride;
          src1 += src1_stride;
          mask += w;
        }
      }
    }
  }
  
  void av1_build_compound_diffwtd_mask_highbd_c(
      uint8_t *mask, DIFFWTD_MASK_TYPE mask_type, const uint8_t *src0,
      int src0_stride, const uint8_t *src1, int src1_stride, int h, int w,
      int bd) {
    switch (mask_type) {
      case DIFFWTD_38:
        diffwtd_mask_highbd(mask, 0, 38, CONVERT_TO_SHORTPTR(src0), src0_stride,
                            CONVERT_TO_SHORTPTR(src1), src1_stride, h, w, bd);
        break;
      case DIFFWTD_38_INV:
        diffwtd_mask_highbd(mask, 1, 38, CONVERT_TO_SHORTPTR(src0), src0_stride,
                            CONVERT_TO_SHORTPTR(src1), src1_stride, h, w, bd);
        break;
      default: assert(0);
    }
  }
  
  static AOM_INLINE void init_wedge_master_masks() {
    int i, j;
    const int w = MASK_MASTER_SIZE;
    const int h = MASK_MASTER_SIZE;
    const int stride = MASK_MASTER_STRIDE;
    // Note: index [0] stores the masters, and [1] its complement.
    // Generate prototype by shifting the masters
    int shift = h / 4;
    for (i = 0; i < h; i += 2) {
      shift_copy(wedge_master_oblique_even,
                 &wedge_mask_obl[0][WEDGE_OBLIQUE63][i * stride], shift,
                 MASK_MASTER_SIZE);
      shift--;
      shift_copy(wedge_master_oblique_odd,
                 &wedge_mask_obl[0][WEDGE_OBLIQUE63][(i + 1) * stride], shift,
                 MASK_MASTER_SIZE);
      memcpy(&wedge_mask_obl[0][WEDGE_VERTICAL][i * stride],
             wedge_master_vertical,
             MASK_MASTER_SIZE * sizeof(wedge_master_vertical[0]));
      memcpy(&wedge_mask_obl[0][WEDGE_VERTICAL][(i + 1) * stride],
             wedge_master_vertical,
             MASK_MASTER_SIZE * sizeof(wedge_master_vertical[0]));
    }
  
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int msk = wedge_mask_obl[0][WEDGE_OBLIQUE63][i * stride + j];
        wedge_mask_obl[0][WEDGE_OBLIQUE27][j * stride + i] = msk;
        wedge_mask_obl[0][WEDGE_OBLIQUE117][i * stride + w - 1 - j] =
            wedge_mask_obl[0][WEDGE_OBLIQUE153][(w - 1 - j) * stride + i] =
                (1 << WEDGE_WEIGHT_BITS) - msk;
        wedge_mask_obl[1][WEDGE_OBLIQUE63][i * stride + j] =
            wedge_mask_obl[1][WEDGE_OBLIQUE27][j * stride + i] =
                (1 << WEDGE_WEIGHT_BITS) - msk;
        wedge_mask_obl[1][WEDGE_OBLIQUE117][i * stride + w - 1 - j] =
            wedge_mask_obl[1][WEDGE_OBLIQUE153][(w - 1 - j) * stride + i] = msk;
        const int mskx = wedge_mask_obl[0][WEDGE_VERTICAL][i * stride + j];
        wedge_mask_obl[0][WEDGE_HORIZONTAL][j * stride + i] = mskx;
        wedge_mask_obl[1][WEDGE_VERTICAL][i * stride + j] =
            wedge_mask_obl[1][WEDGE_HORIZONTAL][j * stride + i] =
                (1 << WEDGE_WEIGHT_BITS) - mskx;
      }
    }
  }
  
  static AOM_INLINE void init_wedge_masks() {
    uint8_t *dst = wedge_mask_buf;
    BLOCK_SIZE bsize;
    memset(wedge_masks, 0, sizeof(wedge_masks));
    for (bsize = BLOCK_4X4; bsize < BLOCK_SIZES_ALL; ++bsize) {
      const wedge_params_type *wedge_params = &av1_wedge_params_lookup[bsize];
      const int wtypes = wedge_params->wedge_types;
      if (wtypes == 0) continue;
      const uint8_t *mask;
      const int bw = block_size_wide[bsize];
      const int bh = block_size_high[bsize];
      int w;
      for (w = 0; w < wtypes; ++w) {
        mask = get_wedge_mask_inplace(w, 0, bsize);
        aom_convolve_copy(mask, MASK_MASTER_STRIDE, dst, bw /* dst_stride */, bw,
                          bh);
        wedge_params->masks[0][w] = dst;
        dst += bw * bh;
  
        mask = get_wedge_mask_inplace(w, 1, bsize);
        aom_convolve_copy(mask, MASK_MASTER_STRIDE, dst, bw /* dst_stride */, bw,
                          bh);
        wedge_params->masks[1][w] = dst;
        dst += bw * bh;
      }
      assert(sizeof(wedge_mask_buf) >= (size_t)(dst - wedge_mask_buf));
    }
  }
  
  /* clang-format off */
  static const uint8_t ii_weights1d[MAX_SB_SIZE] = {
    60, 58, 56, 54, 52, 50, 48, 47, 45, 44, 42, 41, 39, 38, 37, 35, 34, 33, 32,
    31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 22, 21, 20, 19, 19, 18, 18, 17, 16,
    16, 15, 15, 14, 14, 13, 13, 12, 12, 12, 11, 11, 10, 10, 10,  9,  9,  9,  8,
    8,  8,  8,  7,  7,  7,  7,  6,  6,  6,  6,  6,  5,  5,  5,  5,  5,  4,  4,
    4,  4,  4,  4,  4,  4,  3,  3,  3,  3,  3,  3,  3,  3,  3,  2,  2,  2,  2,
    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  1,  1,  1,  1,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1
  };
  static uint8_t ii_size_scales[BLOCK_SIZES_ALL] = {
      32, 16, 16, 16, 8, 8, 8, 4,
      4,  4,  2,  2,  2, 1, 1, 1,
      8,  8,  4,  4,  2, 2
  };
  /* clang-format on */
  
  static AOM_INLINE void build_smooth_interintra_mask(uint8_t *mask, int stride,
                                                      BLOCK_SIZE plane_bsize,
                                                      INTERINTRA_MODE mode) {
    int i, j;
    const int bw = block_size_wide[plane_bsize];
    const int bh = block_size_high[plane_bsize];
    const int size_scale = ii_size_scales[plane_bsize];
  
    switch (mode) {
      case II_V_PRED:
        for (i = 0; i < bh; ++i) {
          memset(mask, ii_weights1d[i * size_scale], bw * sizeof(mask[0]));
          mask += stride;
        }
        break;
  
      case II_H_PRED:
        for (i = 0; i < bh; ++i) {
          for (j = 0; j < bw; ++j) mask[j] = ii_weights1d[j * size_scale];
          mask += stride;
        }
        break;
  
      case II_SMOOTH_PRED:
        for (i = 0; i < bh; ++i) {
          for (j = 0; j < bw; ++j)
            mask[j] = ii_weights1d[(i < j ? i : j) * size_scale];
          mask += stride;
        }
        break;
  
      case II_DC_PRED:
      default:
        for (i = 0; i < bh; ++i) {
          memset(mask, 32, bw * sizeof(mask[0]));
          mask += stride;
        }
        break;
    }
  }
  
  static AOM_INLINE void init_smooth_interintra_masks() {
    for (int m = 0; m < INTERINTRA_MODES; ++m) {
      for (int bs = 0; bs < BLOCK_SIZES_ALL; ++bs) {
        const int bw = block_size_wide[bs];
        const int bh = block_size_high[bs];
        if (bw > MAX_WEDGE_SIZE || bh > MAX_WEDGE_SIZE) continue;
        build_smooth_interintra_mask(smooth_interintra_mask_buf[m][bs], bw, bs,
                                     m);
      }
    }
  }
  
  // Equation of line: f(x, y) = a[0]*(x - a[2]*w/8) + a[1]*(y - a[3]*h/8) = 0
  void av1_init_wedge_masks() {
    init_wedge_master_masks();
    init_wedge_masks();
    init_smooth_interintra_masks();
  }
  
  static AOM_INLINE void build_masked_compound_no_round(
      uint8_t *dst, int dst_stride, const CONV_BUF_TYPE *src0, int src0_stride,
      const CONV_BUF_TYPE *src1, int src1_stride,
      const INTERINTER_COMPOUND_DATA *const comp_data, BLOCK_SIZE sb_type, int h,
      int w, InterPredParams *inter_pred_params) {
    const int ssy = inter_pred_params->subsampling_y;
    const int ssx = inter_pred_params->subsampling_x;
    const uint8_t *mask = av1_get_compound_type_mask(comp_data, sb_type);
    const int mask_stride = block_size_wide[sb_type];
  #if CONFIG_AV1_HIGHBITDEPTH
    if (inter_pred_params->use_hbd_buf) {
      aom_highbd_blend_a64_d16_mask(dst, dst_stride, src0, src0_stride, src1,
                                    src1_stride, mask, mask_stride, w, h, ssx,
                                    ssy, &inter_pred_params->conv_params,
                                    inter_pred_params->bit_depth);
    } else {
      aom_lowbd_blend_a64_d16_mask(dst, dst_stride, src0, src0_stride, src1,
                                   src1_stride, mask, mask_stride, w, h, ssx, ssy,
                                   &inter_pred_params->conv_params);
    }
  #else
    aom_lowbd_blend_a64_d16_mask(dst, dst_stride, src0, src0_stride, src1,
                                 src1_stride, mask, mask_stride, w, h, ssx, ssy,
                                 &inter_pred_params->conv_params);
  #endif
  }
  
  static void make_masked_inter_predictor(const uint8_t *pre, int pre_stride,
                                          uint8_t *dst, int dst_stride,
                                          InterPredParams *inter_pred_params,
                                          const SubpelParams *subpel_params) {
    const INTERINTER_COMPOUND_DATA *comp_data = &inter_pred_params->mask_comp;
    BLOCK_SIZE sb_type = inter_pred_params->sb_type;
  
    // We're going to call av1_make_inter_predictor to generate a prediction into
    // a temporary buffer, then will blend that temporary buffer with that from
    // the other reference.
    DECLARE_ALIGNED(32, uint8_t, tmp_buf[2 * MAX_SB_SQUARE]);
    uint8_t *tmp_dst =
        inter_pred_params->use_hbd_buf ? CONVERT_TO_BYTEPTR(tmp_buf) : tmp_buf;
  
    const int tmp_buf_stride = MAX_SB_SIZE;
    CONV_BUF_TYPE *org_dst = inter_pred_params->conv_params.dst;
    int org_dst_stride = inter_pred_params->conv_params.dst_stride;
    CONV_BUF_TYPE *tmp_buf16 = (CONV_BUF_TYPE *)tmp_buf;
    inter_pred_params->conv_params.dst = tmp_buf16;
    inter_pred_params->conv_params.dst_stride = tmp_buf_stride;
    assert(inter_pred_params->conv_params.do_average == 0);
  
    // This will generate a prediction in tmp_buf for the second reference
    av1_make_inter_predictor(pre, pre_stride, tmp_dst, MAX_SB_SIZE,
                             inter_pred_params, subpel_params);
  
    if (!inter_pred_params->conv_params.plane &&
        comp_data->type == COMPOUND_DIFFWTD) {
      av1_build_compound_diffwtd_mask_d16(
          comp_data->seg_mask, comp_data->mask_type, org_dst, org_dst_stride,
          tmp_buf16, tmp_buf_stride, inter_pred_params->block_height,
          inter_pred_params->block_width, &inter_pred_params->conv_params,
          inter_pred_params->bit_depth);
    }
    build_masked_compound_no_round(
        dst, dst_stride, org_dst, org_dst_stride, tmp_buf16, tmp_buf_stride,
        comp_data, sb_type, inter_pred_params->block_height,
        inter_pred_params->block_width, inter_pred_params);
  }
  
  void av1_build_one_inter_predictor(
      uint8_t *dst, int dst_stride, const MV *const src_mv,
      InterPredParams *inter_pred_params, MACROBLOCKD *xd, int mi_x, int mi_y,
      int ref, uint8_t **mc_buf, CalcSubpelParamsFunc calc_subpel_params_func) {
    SubpelParams subpel_params;
    uint8_t *src;
    int src_stride;
    calc_subpel_params_func(src_mv, inter_pred_params, xd, mi_x, mi_y, ref,
                            mc_buf, &src, &subpel_params, &src_stride);
  
    if (inter_pred_params->comp_mode == UNIFORM_SINGLE ||
        inter_pred_params->comp_mode == UNIFORM_COMP) {
      av1_make_inter_predictor(src, src_stride, dst, dst_stride,
                               inter_pred_params, &subpel_params);
    } else {
      make_masked_inter_predictor(src, src_stride, dst, dst_stride,
                                  inter_pred_params, &subpel_params);
    }
  }
  
  void av1_dist_wtd_comp_weight_assign(const AV1_COMMON *cm,
                                       const MB_MODE_INFO *mbmi, int order_idx,
                                       int *fwd_offset, int *bck_offset,
                                       int *use_dist_wtd_comp_avg,
                                       int is_compound) {
    assert(fwd_offset != NULL && bck_offset != NULL);
    if (!is_compound || mbmi->compound_idx) {
      *fwd_offset = 8;
      *bck_offset = 8;
      *use_dist_wtd_comp_avg = 0;
      return;
    }
  
    *use_dist_wtd_comp_avg = 1;
    const RefCntBuffer *const bck_buf = get_ref_frame_buf(cm, mbmi->ref_frame[0]);
    const RefCntBuffer *const fwd_buf = get_ref_frame_buf(cm, mbmi->ref_frame[1]);
    const int cur_frame_index = cm->cur_frame->order_hint;
    int bck_frame_index = 0, fwd_frame_index = 0;
  
    if (bck_buf != NULL) bck_frame_index = bck_buf->order_hint;
    if (fwd_buf != NULL) fwd_frame_index = fwd_buf->order_hint;
  
    int d0 = clamp(abs(get_relative_dist(&cm->seq_params->order_hint_info,
                                         fwd_frame_index, cur_frame_index)),
                   0, MAX_FRAME_DISTANCE);
    int d1 = clamp(abs(get_relative_dist(&cm->seq_params->order_hint_info,
                                         cur_frame_index, bck_frame_index)),
                   0, MAX_FRAME_DISTANCE);
  
    const int order = d0 <= d1;
  
    if (d0 == 0 || d1 == 0) {
      *fwd_offset = quant_dist_lookup_table[order_idx][3][order];
      *bck_offset = quant_dist_lookup_table[order_idx][3][1 - order];
      return;
    }
  
    int i;
    for (i = 0; i < 3; ++i) {
      int c0 = quant_dist_weight[i][order];
      int c1 = quant_dist_weight[i][!order];
      int d0_c0 = d0 * c0;
      int d1_c1 = d1 * c1;
      if ((d0 > d1 && d0_c0 < d1_c1) || (d0 <= d1 && d0_c0 > d1_c1)) break;
    }
  
    *fwd_offset = quant_dist_lookup_table[order_idx][i][order];
    *bck_offset = quant_dist_lookup_table[order_idx][i][1 - order];
  }
  
  // True if the following hold:
  //  1. Not intrabc and not build_for_obmc
  //  2. At least one dimension is size 4 with subsampling
  //  3. If sub-sampled, none of the previous blocks around the sub-sample
  //     are intrabc or inter-blocks
  static bool is_sub8x8_inter(const MACROBLOCKD *xd, int plane, BLOCK_SIZE bsize,
                              int is_intrabc, int build_for_obmc) {
    if (is_intrabc || build_for_obmc) {
      return false;
    }
  
    const struct macroblockd_plane *const pd = &xd->plane[plane];
    const int ss_x = pd->subsampling_x;
    const int ss_y = pd->subsampling_y;
    const int is_sub4_x = (block_size_wide[bsize] == 4) && ss_x;
    const int is_sub4_y = (block_size_high[bsize] == 4) && ss_y;
    if (!is_sub4_x && !is_sub4_y) {
      return false;
    }
  
    // For sub8x8 chroma blocks, we may be covering more than one luma block's
    // worth of pixels. Thus (mi_x, mi_y) may not be the correct coordinates for
    // the top-left corner of the prediction source - the correct top-left corner
    // is at (pre_x, pre_y).
    const int row_start = is_sub4_y ? -1 : 0;
    const int col_start = is_sub4_x ? -1 : 0;
  
    for (int row = row_start; row <= 0; ++row) {
      for (int col = col_start; col <= 0; ++col) {
        const MB_MODE_INFO *this_mbmi = xd->mi[row * xd->mi_stride + col];
        if (!is_inter_block(this_mbmi)) return false;
        if (is_intrabc_block(this_mbmi)) return false;
      }
    }
    return true;
  }
  
  static void build_inter_predictors_sub8x8(
      const AV1_COMMON *cm, MACROBLOCKD *xd, int plane, const MB_MODE_INFO *mi,
      int mi_x, int mi_y, uint8_t **mc_buf,
      CalcSubpelParamsFunc calc_subpel_params_func) {
    const BLOCK_SIZE bsize = mi->bsize;
    struct macroblockd_plane *const pd = &xd->plane[plane];
    const bool ss_x = pd->subsampling_x;
    const bool ss_y = pd->subsampling_y;
    const int b4_w = block_size_wide[bsize] >> ss_x;
    const int b4_h = block_size_high[bsize] >> ss_y;
    const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, ss_x, ss_y);
    const int b8_w = block_size_wide[plane_bsize];
    const int b8_h = block_size_high[plane_bsize];
    const int is_compound = has_second_ref(mi);
    assert(!is_compound);
    assert(!is_intrabc_block(mi));
  
    // For sub8x8 chroma blocks, we may be covering more than one luma block's
    // worth of pixels. Thus (mi_x, mi_y) may not be the correct coordinates for
    // the top-left corner of the prediction source - the correct top-left corner
    // is at (pre_x, pre_y).
    const int row_start = (block_size_high[bsize] == 4) && ss_y ? -1 : 0;
    const int col_start = (block_size_wide[bsize] == 4) && ss_x ? -1 : 0;
    const int pre_x = (mi_x + MI_SIZE * col_start) >> ss_x;
    const int pre_y = (mi_y + MI_SIZE * row_start) >> ss_y;
  
    int row = row_start;
    for (int y = 0; y < b8_h; y += b4_h) {
      int col = col_start;
      for (int x = 0; x < b8_w; x += b4_w) {
        MB_MODE_INFO *this_mbmi = xd->mi[row * xd->mi_stride + col];
        struct buf_2d *const dst_buf = &pd->dst;
        uint8_t *dst = dst_buf->buf + dst_buf->stride * y + x;
        int ref = 0;
        const RefCntBuffer *ref_buf =
            get_ref_frame_buf(cm, this_mbmi->ref_frame[ref]);
        const struct scale_factors *ref_scale_factors =
            get_ref_scale_factors_const(cm, this_mbmi->ref_frame[ref]);
        const struct scale_factors *const sf = ref_scale_factors;
        const struct buf_2d pre_buf = {
          NULL,
          (plane == 1) ? ref_buf->buf.u_buffer : ref_buf->buf.v_buffer,
          ref_buf->buf.uv_crop_width,
          ref_buf->buf.uv_crop_height,
          ref_buf->buf.uv_stride,
        };
  
        const MV mv = this_mbmi->mv[ref].as_mv;
  
        InterPredParams inter_pred_params;
        av1_init_inter_params(&inter_pred_params, b4_w, b4_h, pre_y + y,
                              pre_x + x, pd->subsampling_x, pd->subsampling_y,
                              xd->bd, is_cur_buf_hbd(xd), mi->use_intrabc, sf,
                              &pre_buf, this_mbmi->interp_filters);
        inter_pred_params.conv_params =
            get_conv_params_no_round(ref, plane, NULL, 0, is_compound, xd->bd);
  
        av1_build_one_inter_predictor(dst, dst_buf->stride, &mv,
                                      &inter_pred_params, xd, mi_x + x, mi_y + y,
                                      ref, mc_buf, calc_subpel_params_func);
  
        ++col;
      }
      ++row;
    }
  }
  
  static void build_inter_predictors_8x8_and_bigger(
      const AV1_COMMON *cm, MACROBLOCKD *xd, int plane, const MB_MODE_INFO *mi,
      int build_for_obmc, int bw, int bh, int mi_x, int mi_y, uint8_t **mc_buf,
      CalcSubpelParamsFunc calc_subpel_params_func) {
    const int is_compound = has_second_ref(mi);
    const int is_intrabc = is_intrabc_block(mi);
    assert(IMPLIES(is_intrabc, !is_compound));
    struct macroblockd_plane *const pd = &xd->plane[plane];
    struct buf_2d *const dst_buf = &pd->dst;
    uint8_t *const dst = dst_buf->buf;
  
    int is_global[2] = { 0, 0 };
    for (int ref = 0; ref < 1 + is_compound; ++ref) {
      const WarpedMotionParams *const wm = &xd->global_motion[mi->ref_frame[ref]];
      is_global[ref] = is_global_mv_block(mi, wm->wmtype);
    }
  
    const BLOCK_SIZE bsize = mi->bsize;
    const int ss_x = pd->subsampling_x;
    const int ss_y = pd->subsampling_y;
    const int row_start =
        (block_size_high[bsize] == 4) && ss_y && !build_for_obmc ? -1 : 0;
    const int col_start =
        (block_size_wide[bsize] == 4) && ss_x && !build_for_obmc ? -1 : 0;
    const int pre_x = (mi_x + MI_SIZE * col_start) >> ss_x;
    const int pre_y = (mi_y + MI_SIZE * row_start) >> ss_y;
  
    for (int ref = 0; ref < 1 + is_compound; ++ref) {
      const struct scale_factors *const sf =
          is_intrabc ? &cm->sf_identity : xd->block_ref_scale_factors[ref];
      struct buf_2d *const pre_buf = is_intrabc ? dst_buf : &pd->pre[ref];
      const MV mv = mi->mv[ref].as_mv;
      const WarpTypesAllowed warp_types = { is_global[ref],
                                            mi->motion_mode == WARPED_CAUSAL };
  
      InterPredParams inter_pred_params;
      av1_init_inter_params(&inter_pred_params, bw, bh, pre_y, pre_x,
                            pd->subsampling_x, pd->subsampling_y, xd->bd,
                            is_cur_buf_hbd(xd), mi->use_intrabc, sf, pre_buf,
                            mi->interp_filters);
      if (is_compound) av1_init_comp_mode(&inter_pred_params);
      inter_pred_params.conv_params = get_conv_params_no_round(
          ref, plane, xd->tmp_conv_dst, MAX_SB_SIZE, is_compound, xd->bd);
  
      av1_dist_wtd_comp_weight_assign(
          cm, mi, 0, &inter_pred_params.conv_params.fwd_offset,
          &inter_pred_params.conv_params.bck_offset,
          &inter_pred_params.conv_params.use_dist_wtd_comp_avg, is_compound);
  
      if (!build_for_obmc)
        av1_init_warp_params(&inter_pred_params, &warp_types, ref, xd, mi);
  
      if (is_masked_compound_type(mi->interinter_comp.type)) {
        inter_pred_params.sb_type = mi->bsize;
        inter_pred_params.mask_comp = mi->interinter_comp;
        if (ref == 1) {
          inter_pred_params.conv_params.do_average = 0;
          inter_pred_params.comp_mode = MASK_COMP;
        }
        // Assign physical buffer.
        inter_pred_params.mask_comp.seg_mask = xd->seg_mask;
      }
  
      av1_build_one_inter_predictor(dst, dst_buf->stride, &mv, &inter_pred_params,
                                    xd, mi_x, mi_y, ref, mc_buf,
                                    calc_subpel_params_func);
    }
  }
  
  void av1_build_inter_predictors(const AV1_COMMON *cm, MACROBLOCKD *xd,
                                  int plane, const MB_MODE_INFO *mi,
                                  int build_for_obmc, int bw, int bh, int mi_x,
                                  int mi_y, uint8_t **mc_buf,
                                  CalcSubpelParamsFunc calc_subpel_params_func) {
    if (is_sub8x8_inter(xd, plane, mi->bsize, is_intrabc_block(mi),
                        build_for_obmc)) {
      assert(bw < 8 || bh < 8);
      build_inter_predictors_sub8x8(cm, xd, plane, mi, mi_x, mi_y, mc_buf,
                                    calc_subpel_params_func);
    } else {
      build_inter_predictors_8x8_and_bigger(cm, xd, plane, mi, build_for_obmc, bw,
                                            bh, mi_x, mi_y, mc_buf,
                                            calc_subpel_params_func);
    }
  }
  void av1_setup_dst_planes(struct macroblockd_plane *planes, BLOCK_SIZE bsize,
                            const YV12_BUFFER_CONFIG *src, int mi_row, int mi_col,
                            const int plane_start, const int plane_end) {
    // We use AOMMIN(num_planes, MAX_MB_PLANE) instead of num_planes to quiet
    // the static analysis warnings.
    for (int i = plane_start; i < AOMMIN(plane_end, MAX_MB_PLANE); ++i) {
      struct macroblockd_plane *const pd = &planes[i];
      const int is_uv = i > 0;
      setup_pred_plane(&pd->dst, bsize, src->buffers[i], src->crop_widths[is_uv],
                       src->crop_heights[is_uv], src->strides[is_uv], mi_row,
                       mi_col, NULL, pd->subsampling_x, pd->subsampling_y);
    }
  }
  
  void av1_setup_pre_planes(MACROBLOCKD *xd, int idx,
                            const YV12_BUFFER_CONFIG *src, int mi_row, int mi_col,
                            const struct scale_factors *sf,
                            const int num_planes) {
    if (src != NULL) {
      // We use AOMMIN(num_planes, MAX_MB_PLANE) instead of num_planes to quiet
      // the static analysis warnings.
      for (int i = 0; i < AOMMIN(num_planes, MAX_MB_PLANE); ++i) {
        struct macroblockd_plane *const pd = &xd->plane[i];
        const int is_uv = i > 0;
        setup_pred_plane(&pd->pre[idx], xd->mi[0]->bsize, src->buffers[i],
                         src->crop_widths[is_uv], src->crop_heights[is_uv],
                         src->strides[is_uv], mi_row, mi_col, sf,
                         pd->subsampling_x, pd->subsampling_y);
      }
    }
  }
  
  // obmc_mask_N[overlap_position]
  static const uint8_t obmc_mask_1[1] = { 64 };
  DECLARE_ALIGNED(2, static const uint8_t, obmc_mask_2[2]) = { 45, 64 };
  
  DECLARE_ALIGNED(4, static const uint8_t, obmc_mask_4[4]) = { 39, 50, 59, 64 };
  
  static const uint8_t obmc_mask_8[8] = { 36, 42, 48, 53, 57, 61, 64, 64 };
  
  static const uint8_t obmc_mask_16[16] = { 34, 37, 40, 43, 46, 49, 52, 54,
                                            56, 58, 60, 61, 64, 64, 64, 64 };
  
  static const uint8_t obmc_mask_32[32] = { 33, 35, 36, 38, 40, 41, 43, 44,
                                            45, 47, 48, 50, 51, 52, 53, 55,
                                            56, 57, 58, 59, 60, 60, 61, 62,
                                            64, 64, 64, 64, 64, 64, 64, 64 };
  
  static const uint8_t obmc_mask_64[64] = {
    33, 34, 35, 35, 36, 37, 38, 39, 40, 40, 41, 42, 43, 44, 44, 44,
    45, 46, 47, 47, 48, 49, 50, 51, 51, 51, 52, 52, 53, 54, 55, 56,
    56, 56, 57, 57, 58, 58, 59, 60, 60, 60, 60, 60, 61, 62, 62, 62,
    62, 62, 63, 63, 63, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
  };
  
  const uint8_t *av1_get_obmc_mask(int length) {
    switch (length) {
      case 1: return obmc_mask_1;
      case 2: return obmc_mask_2;
      case 4: return obmc_mask_4;
      case 8: return obmc_mask_8;
      case 16: return obmc_mask_16;
      case 32: return obmc_mask_32;
      case 64: return obmc_mask_64;
      default: assert(0); return NULL;
    }
  }
  
  static INLINE void increment_int_ptr(MACROBLOCKD *xd, int rel_mi_row,
                                       int rel_mi_col, uint8_t op_mi_size,
                                       int dir, MB_MODE_INFO *mi, void *fun_ctxt,
                                       const int num_planes) {
    (void)xd;
    (void)rel_mi_row;
    (void)rel_mi_col;
    (void)op_mi_size;
    (void)dir;
    (void)mi;
    ++*(int *)fun_ctxt;
    (void)num_planes;
  }
  
  void av1_count_overlappable_neighbors(const AV1_COMMON *cm, MACROBLOCKD *xd) {
    MB_MODE_INFO *mbmi = xd->mi[0];
  
    mbmi->overlappable_neighbors = 0;
  
    if (!is_motion_variation_allowed_bsize(mbmi->bsize)) return;
  
    foreach_overlappable_nb_above(cm, xd, INT_MAX, increment_int_ptr,
                                  &mbmi->overlappable_neighbors);
    if (mbmi->overlappable_neighbors) return;
    foreach_overlappable_nb_left(cm, xd, INT_MAX, increment_int_ptr,
                                 &mbmi->overlappable_neighbors);
  }
  
  // HW does not support < 4x4 prediction. To limit the bandwidth requirement, if
  // block-size of current plane is smaller than 8x8, always only blend with the
  // left neighbor(s) (skip blending with the above side).
  #define DISABLE_CHROMA_U8X8_OBMC 0  // 0: one-sided obmc; 1: disable
  
  int av1_skip_u4x4_pred_in_obmc(BLOCK_SIZE bsize,
                                 const struct macroblockd_plane *pd, int dir) {
    assert(is_motion_variation_allowed_bsize(bsize));
  
    const BLOCK_SIZE bsize_plane =
        get_plane_block_size(bsize, pd->subsampling_x, pd->subsampling_y);
    switch (bsize_plane) {
  #if DISABLE_CHROMA_U8X8_OBMC
      case BLOCK_4X4:
      case BLOCK_8X4:
      case BLOCK_4X8: return 1; break;
  #else
      case BLOCK_4X4:
      case BLOCK_8X4:
      case BLOCK_4X8: return dir == 0; break;
  #endif
      default: return 0;
    }
  }
  
  void av1_modify_neighbor_predictor_for_obmc(MB_MODE_INFO *mbmi) {
    mbmi->ref_frame[1] = NONE_FRAME;
    mbmi->interinter_comp.type = COMPOUND_AVERAGE;
  
    return;
  }
  
  struct obmc_inter_pred_ctxt {
    uint8_t **adjacent;
    int *adjacent_stride;
  };
  
  static INLINE void build_obmc_inter_pred_above(
      MACROBLOCKD *xd, int rel_mi_row, int rel_mi_col, uint8_t op_mi_size,
      int dir, MB_MODE_INFO *above_mi, void *fun_ctxt, const int num_planes) {
    (void)above_mi;
    (void)rel_mi_row;
    (void)dir;
    struct obmc_inter_pred_ctxt *ctxt = (struct obmc_inter_pred_ctxt *)fun_ctxt;
    const BLOCK_SIZE bsize = xd->mi[0]->bsize;
    const int overlap =
        AOMMIN(block_size_high[bsize], block_size_high[BLOCK_64X64]) >> 1;
  
    for (int plane = 0; plane < num_planes; ++plane) {
      const struct macroblockd_plane *pd = &xd->plane[plane];
      const int bw = (op_mi_size * MI_SIZE) >> pd->subsampling_x;
      const int bh = overlap >> pd->subsampling_y;
      const int plane_col = (rel_mi_col * MI_SIZE) >> pd->subsampling_x;
  
      if (av1_skip_u4x4_pred_in_obmc(bsize, pd, 0)) continue;
  
      const int dst_stride = pd->dst.stride;
      uint8_t *const dst = &pd->dst.buf[plane_col];
      const int tmp_stride = ctxt->adjacent_stride[plane];
      const uint8_t *const tmp = &ctxt->adjacent[plane][plane_col];
      const uint8_t *const mask = av1_get_obmc_mask(bh);
  #if CONFIG_AV1_HIGHBITDEPTH
      const int is_hbd = is_cur_buf_hbd(xd);
      if (is_hbd)
        aom_highbd_blend_a64_vmask(dst, dst_stride, dst, dst_stride, tmp,
                                   tmp_stride, mask, bw, bh, xd->bd);
      else
        aom_blend_a64_vmask(dst, dst_stride, dst, dst_stride, tmp, tmp_stride,
                            mask, bw, bh);
  #else
      aom_blend_a64_vmask(dst, dst_stride, dst, dst_stride, tmp, tmp_stride, mask,
                          bw, bh);
  #endif
    }
  }
  
  static INLINE void build_obmc_inter_pred_left(
      MACROBLOCKD *xd, int rel_mi_row, int rel_mi_col, uint8_t op_mi_size,
      int dir, MB_MODE_INFO *left_mi, void *fun_ctxt, const int num_planes) {
    (void)left_mi;
    (void)rel_mi_col;
    (void)dir;
    struct obmc_inter_pred_ctxt *ctxt = (struct obmc_inter_pred_ctxt *)fun_ctxt;
    const BLOCK_SIZE bsize = xd->mi[0]->bsize;
    const int overlap =
        AOMMIN(block_size_wide[bsize], block_size_wide[BLOCK_64X64]) >> 1;
  
    for (int plane = 0; plane < num_planes; ++plane) {
      const struct macroblockd_plane *pd = &xd->plane[plane];
      const int bw = overlap >> pd->subsampling_x;
      const int bh = (op_mi_size * MI_SIZE) >> pd->subsampling_y;
      const int plane_row = (rel_mi_row * MI_SIZE) >> pd->subsampling_y;
  
      if (av1_skip_u4x4_pred_in_obmc(bsize, pd, 1)) continue;
  
      const int dst_stride = pd->dst.stride;
      uint8_t *const dst = &pd->dst.buf[plane_row * dst_stride];
      const int tmp_stride = ctxt->adjacent_stride[plane];
      const uint8_t *const tmp = &ctxt->adjacent[plane][plane_row * tmp_stride];
      const uint8_t *const mask = av1_get_obmc_mask(bw);
  
  #if CONFIG_AV1_HIGHBITDEPTH
      const int is_hbd = is_cur_buf_hbd(xd);
      if (is_hbd)
        aom_highbd_blend_a64_hmask(dst, dst_stride, dst, dst_stride, tmp,
                                   tmp_stride, mask, bw, bh, xd->bd);
      else
        aom_blend_a64_hmask(dst, dst_stride, dst, dst_stride, tmp, tmp_stride,
                            mask, bw, bh);
  #else
      aom_blend_a64_hmask(dst, dst_stride, dst, dst_stride, tmp, tmp_stride, mask,
                          bw, bh);
  #endif
    }
  }
  
  // This function combines motion compensated predictions that are generated by
  // top/left neighboring blocks' inter predictors with the regular inter
  // prediction. We assume the original prediction (bmc) is stored in
  // xd->plane[].dst.buf
  void av1_build_obmc_inter_prediction(const AV1_COMMON *cm, MACROBLOCKD *xd,
                                       uint8_t *above[MAX_MB_PLANE],
                                       int above_stride[MAX_MB_PLANE],
                                       uint8_t *left[MAX_MB_PLANE],
                                       int left_stride[MAX_MB_PLANE]) {
    const BLOCK_SIZE bsize = xd->mi[0]->bsize;
  
    // handle above row
    struct obmc_inter_pred_ctxt ctxt_above = { above, above_stride };
    foreach_overlappable_nb_above(cm, xd,
                                  max_neighbor_obmc[mi_size_wide_log2[bsize]],
                                  build_obmc_inter_pred_above, &ctxt_above);
  
    // handle left column
    struct obmc_inter_pred_ctxt ctxt_left = { left, left_stride };
    foreach_overlappable_nb_left(cm, xd,
                                 max_neighbor_obmc[mi_size_high_log2[bsize]],
                                 build_obmc_inter_pred_left, &ctxt_left);
  }
  
  void av1_setup_obmc_dst_bufs(MACROBLOCKD *xd, uint8_t **dst_buf1,
                               uint8_t **dst_buf2) {
  #if CONFIG_AV1_HIGHBITDEPTH
    if (is_cur_buf_hbd(xd)) {
      int len = sizeof(uint16_t);
      dst_buf1[0] = CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[0]);
      dst_buf1[1] =
          CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[0] + MAX_SB_SQUARE * len);
      dst_buf1[2] =
          CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[0] + MAX_SB_SQUARE * 2 * len);
      dst_buf2[0] = CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[1]);
      dst_buf2[1] =
          CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[1] + MAX_SB_SQUARE * len);
      dst_buf2[2] =
          CONVERT_TO_BYTEPTR(xd->tmp_obmc_bufs[1] + MAX_SB_SQUARE * 2 * len);
    } else {
  #endif  // CONFIG_AV1_HIGHBITDEPTH
      dst_buf1[0] = xd->tmp_obmc_bufs[0];
      dst_buf1[1] = xd->tmp_obmc_bufs[0] + MAX_SB_SQUARE;
      dst_buf1[2] = xd->tmp_obmc_bufs[0] + MAX_SB_SQUARE * 2;
      dst_buf2[0] = xd->tmp_obmc_bufs[1];
      dst_buf2[1] = xd->tmp_obmc_bufs[1] + MAX_SB_SQUARE;
      dst_buf2[2] = xd->tmp_obmc_bufs[1] + MAX_SB_SQUARE * 2;
  #if CONFIG_AV1_HIGHBITDEPTH
    }
  #endif  // CONFIG_AV1_HIGHBITDEPTH
  }
  
  void av1_setup_build_prediction_by_above_pred(
      MACROBLOCKD *xd, int rel_mi_col, uint8_t above_mi_width,
      MB_MODE_INFO *above_mbmi, struct build_prediction_ctxt *ctxt,
      const int num_planes) {
    const BLOCK_SIZE a_bsize = AOMMAX(BLOCK_8X8, above_mbmi->bsize);
    const int above_mi_col = xd->mi_col + rel_mi_col;
  
    av1_modify_neighbor_predictor_for_obmc(above_mbmi);
  
    for (int j = 0; j < num_planes; ++j) {
      struct macroblockd_plane *const pd = &xd->plane[j];
      setup_pred_plane(&pd->dst, a_bsize, ctxt->tmp_buf[j], ctxt->tmp_width[j],
                       ctxt->tmp_height[j], ctxt->tmp_stride[j], 0, rel_mi_col,
                       NULL, pd->subsampling_x, pd->subsampling_y);
    }
  
    const int num_refs = 1 + has_second_ref(above_mbmi);
  
    for (int ref = 0; ref < num_refs; ++ref) {
      const MV_REFERENCE_FRAME frame = above_mbmi->ref_frame[ref];
  
      const RefCntBuffer *const ref_buf = get_ref_frame_buf(ctxt->cm, frame);
      const struct scale_factors *const sf =
          get_ref_scale_factors_const(ctxt->cm, frame);
      xd->block_ref_scale_factors[ref] = sf;
      if ((!av1_is_valid_scale(sf)))
        aom_internal_error(xd->error_info, AOM_CODEC_UNSUP_BITSTREAM,
                           "Reference frame has invalid dimensions");
      av1_setup_pre_planes(xd, ref, &ref_buf->buf, xd->mi_row, above_mi_col, sf,
                           num_planes);
    }
  
    xd->mb_to_left_edge = 8 * MI_SIZE * (-above_mi_col);
    xd->mb_to_right_edge =
        ctxt->mb_to_far_edge +
        (xd->width - rel_mi_col - above_mi_width) * MI_SIZE * 8;
  }
  
  void av1_setup_build_prediction_by_left_pred(MACROBLOCKD *xd, int rel_mi_row,
                                               uint8_t left_mi_height,
                                               MB_MODE_INFO *left_mbmi,
                                               struct build_prediction_ctxt *ctxt,
                                               const int num_planes) {
    const BLOCK_SIZE l_bsize = AOMMAX(BLOCK_8X8, left_mbmi->bsize);
    const int left_mi_row = xd->mi_row + rel_mi_row;
  
    av1_modify_neighbor_predictor_for_obmc(left_mbmi);
  
    for (int j = 0; j < num_planes; ++j) {
      struct macroblockd_plane *const pd = &xd->plane[j];
      setup_pred_plane(&pd->dst, l_bsize, ctxt->tmp_buf[j], ctxt->tmp_width[j],
                       ctxt->tmp_height[j], ctxt->tmp_stride[j], rel_mi_row, 0,
                       NULL, pd->subsampling_x, pd->subsampling_y);
    }
  
    const int num_refs = 1 + has_second_ref(left_mbmi);
  
    for (int ref = 0; ref < num_refs; ++ref) {
      const MV_REFERENCE_FRAME frame = left_mbmi->ref_frame[ref];
  
      const RefCntBuffer *const ref_buf = get_ref_frame_buf(ctxt->cm, frame);
      const struct scale_factors *const ref_scale_factors =
          get_ref_scale_factors_const(ctxt->cm, frame);
  
      xd->block_ref_scale_factors[ref] = ref_scale_factors;
      if ((!av1_is_valid_scale(ref_scale_factors)))
        aom_internal_error(xd->error_info, AOM_CODEC_UNSUP_BITSTREAM,
                           "Reference frame has invalid dimensions");
      av1_setup_pre_planes(xd, ref, &ref_buf->buf, left_mi_row, xd->mi_col,
                           ref_scale_factors, num_planes);
    }
  
    xd->mb_to_top_edge = GET_MV_SUBPEL(MI_SIZE * (-left_mi_row));
    xd->mb_to_bottom_edge =
        ctxt->mb_to_far_edge +
        GET_MV_SUBPEL((xd->height - rel_mi_row - left_mi_height) * MI_SIZE);
  }
  
  static AOM_INLINE void combine_interintra(
      INTERINTRA_MODE mode, int8_t use_wedge_interintra, int8_t wedge_index,
      int8_t wedge_sign, BLOCK_SIZE bsize, BLOCK_SIZE plane_bsize,
      uint8_t *comppred, int compstride, const uint8_t *interpred,
      int interstride, const uint8_t *intrapred, int intrastride) {
    const int bw = block_size_wide[plane_bsize];
    const int bh = block_size_high[plane_bsize];
  
    if (use_wedge_interintra) {
      if (av1_is_wedge_used(bsize)) {
        const uint8_t *mask =
            av1_get_contiguous_soft_mask(wedge_index, wedge_sign, bsize);
        const int subw = 2 * mi_size_wide[bsize] == bw;
        const int subh = 2 * mi_size_high[bsize] == bh;
        aom_blend_a64_mask(comppred, compstride, intrapred, intrastride,
                           interpred, interstride, mask, block_size_wide[bsize],
                           bw, bh, subw, subh);
      }
      return;
    }
  
    const uint8_t *mask = smooth_interintra_mask_buf[mode][plane_bsize];
    aom_blend_a64_mask(comppred, compstride, intrapred, intrastride, interpred,
                       interstride, mask, bw, bw, bh, 0, 0);
  }
  
  #if CONFIG_AV1_HIGHBITDEPTH
  static AOM_INLINE void combine_interintra_highbd(
      INTERINTRA_MODE mode, int8_t use_wedge_interintra, int8_t wedge_index,
      int8_t wedge_sign, BLOCK_SIZE bsize, BLOCK_SIZE plane_bsize,
      uint8_t *comppred8, int compstride, const uint8_t *interpred8,
      int interstride, const uint8_t *intrapred8, int intrastride, int bd) {
    const int bw = block_size_wide[plane_bsize];
    const int bh = block_size_high[plane_bsize];
  
    if (use_wedge_interintra) {
      if (av1_is_wedge_used(bsize)) {
        const uint8_t *mask =
            av1_get_contiguous_soft_mask(wedge_index, wedge_sign, bsize);
        const int subh = 2 * mi_size_high[bsize] == bh;
        const int subw = 2 * mi_size_wide[bsize] == bw;
        aom_highbd_blend_a64_mask(comppred8, compstride, intrapred8, intrastride,
                                  interpred8, interstride, mask,
                                  block_size_wide[bsize], bw, bh, subw, subh, bd);
      }
      return;
    }
  
    uint8_t mask[MAX_SB_SQUARE];
    build_smooth_interintra_mask(mask, bw, plane_bsize, mode);
    aom_highbd_blend_a64_mask(comppred8, compstride, intrapred8, intrastride,
                              interpred8, interstride, mask, bw, bw, bh, 0, 0,
                              bd);
  }
  #endif
  
  void av1_build_intra_predictors_for_interintra(const AV1_COMMON *cm,
                                                 MACROBLOCKD *xd,
                                                 BLOCK_SIZE bsize, int plane,
                                                 const BUFFER_SET *ctx,
                                                 uint8_t *dst, int dst_stride) {
    struct macroblockd_plane *const pd = &xd->plane[plane];
    const int ssx = xd->plane[plane].subsampling_x;
    const int ssy = xd->plane[plane].subsampling_y;
    BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, ssx, ssy);
    PREDICTION_MODE mode = interintra_to_intra_mode[xd->mi[0]->interintra_mode];
    assert(xd->mi[0]->angle_delta[PLANE_TYPE_Y] == 0);
    assert(xd->mi[0]->angle_delta[PLANE_TYPE_UV] == 0);
    assert(xd->mi[0]->filter_intra_mode_info.use_filter_intra == 0);
    assert(xd->mi[0]->use_intrabc == 0);
    const SequenceHeader *seq_params = cm->seq_params;
  
    av1_predict_intra_block(xd, seq_params->sb_size,
                            seq_params->enable_intra_edge_filter, pd->width,
                            pd->height, max_txsize_rect_lookup[plane_bsize], mode,
                            0, 0, FILTER_INTRA_MODES, ctx->plane[plane],
                            ctx->stride[plane], dst, dst_stride, 0, 0, plane);
  }
  
  void av1_combine_interintra(MACROBLOCKD *xd, BLOCK_SIZE bsize, int plane,
                              const uint8_t *inter_pred, int inter_stride,
                              const uint8_t *intra_pred, int intra_stride) {
    const int ssx = xd->plane[plane].subsampling_x;
    const int ssy = xd->plane[plane].subsampling_y;
    const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, ssx, ssy);
  #if CONFIG_AV1_HIGHBITDEPTH
    if (is_cur_buf_hbd(xd)) {
      combine_interintra_highbd(
          xd->mi[0]->interintra_mode, xd->mi[0]->use_wedge_interintra,
          xd->mi[0]->interintra_wedge_index, INTERINTRA_WEDGE_SIGN, bsize,
          plane_bsize, xd->plane[plane].dst.buf, xd->plane[plane].dst.stride,
          inter_pred, inter_stride, intra_pred, intra_stride, xd->bd);
      return;
    }
  #endif
    combine_interintra(
        xd->mi[0]->interintra_mode, xd->mi[0]->use_wedge_interintra,
        xd->mi[0]->interintra_wedge_index, INTERINTRA_WEDGE_SIGN, bsize,
        plane_bsize, xd->plane[plane].dst.buf, xd->plane[plane].dst.stride,
        inter_pred, inter_stride, intra_pred, intra_stride);
  }
  
  // build interintra_predictors for one plane
  void av1_build_interintra_predictor(const AV1_COMMON *cm, MACROBLOCKD *xd,
                                      uint8_t *pred, int stride,
                                      const BUFFER_SET *ctx, int plane,
                                      BLOCK_SIZE bsize) {
    assert(bsize < BLOCK_SIZES_ALL);
    if (is_cur_buf_hbd(xd)) {
      DECLARE_ALIGNED(16, uint16_t, intrapredictor[MAX_SB_SQUARE]);
      av1_build_intra_predictors_for_interintra(
          cm, xd, bsize, plane, ctx, CONVERT_TO_BYTEPTR(intrapredictor),
          MAX_SB_SIZE);
      av1_combine_interintra(xd, bsize, plane, pred, stride,
                             CONVERT_TO_BYTEPTR(intrapredictor), MAX_SB_SIZE);
    } else {
      DECLARE_ALIGNED(16, uint8_t, intrapredictor[MAX_SB_SQUARE]);
      av1_build_intra_predictors_for_interintra(cm, xd, bsize, plane, ctx,
                                                intrapredictor, MAX_SB_SIZE);
      av1_combine_interintra(xd, bsize, plane, pred, stride, intrapredictor,
                             MAX_SB_SIZE);
    }
  }
  